100 results on '"Li, Fang-Li"'
Search Results
2. Holographic Einstein rings of a black hole with a global monopole
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Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The global monopole solutions which give rise to quite unusual physical phenomena have captured considerable attention. In this paper, we study the Einstein ring of the spherically symmetric AdS black hole solution with a global monopole based on the AdS/CFT correspondence. With the help of the given response function of the QFT on the boundary, we construct the holographic images of the black hole in the bulk. Our results exhibit the absolute amplitude of total response function $$|\langle \mathcal {O}\rangle |$$ | ⟨ O ⟩ | increases with the decrease of the monopole parameter b and the temperature T. And the frequency $$\omega $$ ω of the Gaussian source will also increase the absolute amplitude. These parameters also affects the Einstein ring. With the change of the observation position, this ring will change from the concentric stripe to a luminosity-deformed ring, or light points. And the monopole parameter has an effect on the brightness and the position of Einstein ring. All these results imply that the holographic images can be used as an effective tool to distinguish different types of black holes for fixed wave source and optical system. These theoretical proposal opens a door to gravitational phenomena on strongly correlated material. Therefore, the holographic Einstein ring is of great theoretical and experimental significance for our research. In theory, it provides us a new way to find a necessary condition for the existence of the dual black hole. And experimentally speaking, if we can realize suitable targets for observing AdS black holes successfully, we would be able to observe Einstein rings by tabletop experiments when we apply localized sources on such materials and measure their responses.
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- 2024
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3. Holographic Einstein rings of non-commutative black holes
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Xin-Yun Hu, Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract With the help of AdS/CFT correspondence, we derive the desired response function of QFT on the boundary of the non-commutative black hole. Using the virtual optical system with a convex lens, we obtain the Einstein rings of the black hole from the response function. All the results show that the holographic ring always appears with the concentric stripe when the observer located at the north pole. With the change of the observation position, the ring changes into a luminosity-deformed ring, or bright spot. We also investigate the effect of the non-commutative parameter on the ring and find the ring radius becomes larger as the parameter increases. The effect of the temperature on the ring radius is also investigated, it is found that the higher the temperature, the smaller the ring radius. In addition, we also obtain the ingoing angle of the photon via geometric optics, as expected, this angle is consistent well with the angle of the Einstein ring obtained via holography.
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- 2024
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4. Holographic study on Einstein ring for a charged black hole in conformal gravity
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Xin-Yun Hu, Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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AdS/CFT correspondence ,Holographic dual ,Holographic Einstein ring ,Physics ,QC1-999 - Abstract
Under the help of AdS/CFT correspondence, the Einstein ring of a charged black hole in conformal gravity has been studied. As an alternative to standard Einstein’s theory, the conformal gravity is both renormalizable and unitary. And such conformal theory can naturally solve some troublesome problems in physics, such as the quantum gravity problem, the dark matter problem and so on. Considering the conformal gravity has many advantages, therefore in this paper, we study Einstein ring and the effect of gravity-related parameters c0, temperature T and chemical potential u on such Einstein ring in the conformal gravity through the holographic method. Explicitly, imposing an oscillating Gauss source on one side of the AdS boundary which propagates in the bulk, the response functions are derived on the other side of the boundary. Given the proposed wave optics system, the Einstein rings are observed as expected. All these results reveal that when the observer locates at the north pole, there always exists the Einstein ring and surrounding concentric stripes. And such ring becomes into a luminosity-deformed ring or light spot while the observer departs away from the north pole. We also investigate the effect of temperature T, chemical potential u and gravity-related parameters c0 on the ring radius. We find the ring radius increases with the decrease of the temperature, increase of the chemical potential, and increase of the gravity-related parameters respectively. And more, in conformal gravity, because the charge does not appear in the metric but is given by the constraint relation, the chemical potential affects the radius of the ring differently compared with that in Einstein’s gravity. To check the results in the framework of holography, we investigate the ingoing angle of photon at the photon ring via geometric optics and find it is consistent with the angle of Einstein ring obtained via holography.
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- 2024
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5. A segmentation model to detect cevical lesions based on machine learning of colposcopic images
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Zhen Li, Chu-Mei Zeng, Yan-Gang Dong, Ying Cao, Li-Yao Yu, Hui-Ying Liu, Xun Tian, Rui Tian, Chao-Yue Zhong, Ting-Ting Zhao, Jia-Shuo Liu, Ye Chen, Li-Fang Li, Zhe-Ying Huang, Yu-Yan Wang, Zheng Hu, Jingjing Zhang, Jiu-Xing Liang, Ping Zhou, and Yi-Qin Lu
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HSIL ,Colposcopy ,Diagnosis ,Segmentation ,Artificial intelligence ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Semantic segmentation is crucial in medical image diagnosis. Traditional deep convolutional neural networks excel in image classification and object detection but fall short in segmentation tasks. Enhancing the accuracy and efficiency of detecting high-level cervical lesions and invasive cancer poses a primary challenge in segmentation model development. Methods: Between 2018 and 2022, we retrospectively studied a total of 777 patients, comprising 339 patients with high-level cervical lesions and 313 patients with microinvasive or invasive cervical cancer. Overall, 1554 colposcopic images were put into the DeepLabv3+ model for learning. Accuracy, Precision, Specificity, and mIoU were employed to evaluate the performance of the model in the prediction of cervical high-level lesions and cancer. Results: Experiments showed that our segmentation model had better diagnosis efficiency than colposcopic experts and other artificial intelligence models, and reached Accuracy of 93.29 %, Precision of 87.2 %, Specificity of 90.1 %, and mIoU of 80.27 %, respectively. Conclution: The DeepLabv3+ model had good performance in the segmentation of cervical lesions in colposcopic post-acetic-acid images and can better assist colposcopists in improving the diagnosis.
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- 2023
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6. Efficacy of the feedback teaching method on the compliance of tumor patients in preventing falls
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Li-Fang Li, Xiao-Yan Zhao, Yue-Jie Chen, and Mei Ji
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Surgery ,RD1-811 - Published
- 2022
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7. Quantifying Event‐Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR‐MHD Simulation
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Li‐Fang Li, Weichao Tu, Lei Dai, Bin‐Bin Tang, Chi Wang, Mohammad Barani, Gang Zeng, Chao Wei, and J.L. Burch
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- 2020
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8. Holographic Van der Waals-like phase transition in the Gauss–Bonnet gravity
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Song He, Li-Fang Li, and Xiao-Xiong Zeng
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Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
The Van der Waals-like phase transition is observed in temperature–thermal entropy plane in spherically symmetric charged Gauss–Bonnet–AdS black hole background. In terms of AdS/CFT, the non-local observables such as holographic entanglement entropy, Wilson loop, and two point correlation function of very heavy operators in the field theory dual to spherically symmetric charged Gauss–Bonnet–AdS black hole have been investigated. All of them exhibit the Van der Waals-like phase transition for a fixed charge parameter or Gauss–Bonnet parameter in such gravity background. Further, with choosing various values of charge or Gauss–Bonnet parameter, the equal area law and the critical exponent of the heat capacity are found to be consistent with phase structures in temperature–thermal entropy plane.
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- 2017
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9. Van der Waals phase transition in the framework of holography
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Xiao-Xiong Zeng and Li-Fang Li
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Physics ,QC1-999 - Abstract
Phase structure of the quintessence Reissner–Nordström–AdS black hole is probed by the nonlocal observables such as holographic entanglement entropy and two point correlation function. Our result shows that, as the case of the thermal entropy, both the observables exhibit the Van der Waals-like phase transition. To reinforce this conclusion, we further check the equal area law for the first order phase transition and critical exponent of the heat capacity for the second order phase transition. We also discuss the effect of the state parameter on the phase structure of the nonlocal observables.
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- 2017
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10. Phase transition of holographic entanglement entropy in massive gravity
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Xiao-Xiong Zeng, Hongbao Zhang, and Li-Fang Li
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Physics ,QC1-999 - Abstract
The phase structure of holographic entanglement entropy is studied in massive gravity for the quantum systems with finite and infinite volumes, which in the bulk is dual to calculating the minimal surface area for a black hole and black brane respectively. In the entanglement entropy–temperature plane, we find for both the black hole and black brane there is a Van der Waals-like phase transition as the case in thermal entropy–temperature plane. That is, there is a first order phase transition for the small charge and a second order phase transition at the critical charge. For the first order phase transition, the equal area law is checked and for the second order phase transition, the critical exponent of the heat capacity is obtained. All the results show that the phase structure of holographic entanglement entropy is the same as that of thermal entropy regardless of the volume of the spacetime on the boundary.
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- 2016
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11. LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection
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Jiao Li, Jiang-Dan Li, Yan-Jun Guo, Zhan-Wen Han, Xue-Fei Chen, Chao Liu, Hong-Wei Ge, Deng-Kai Jiang, Li-Fang Li, Bo Zhang, Jia-Ming Liu, Hao Tian, Hao-Tong Zhang, Hai-Long Yuan, Wen-Yuan Cui, Juan-Juan Ren, Jing-Hao Cai, and Jian-Rong Shi
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Astrophysics - Solar and Stellar Astrophysics ,General Physics and Astronomy ,FOS: Physical sciences ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution (R ∼ 7500) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital period distribution, mass ratio distribution) of binary stars and exotic stars. We intend to observe about 30000 stars (10 mag ≤ G < 14.5 mag) with at least 10 visits in five years. We first planned to observe 25 plates around the galactic plane in 2018. Then the plates were reduced to 12 in 2019 because of the limitation of observation. At the same time, two new plates located at the high galactic latitude were added to explore binary properties influenced by the different environments. In this survey project, we set the identified exotic and low-metallicity stars with the highest observation priorities. For the rest of the selected stars, we gave the higher priority to the relatively brighter stars in order to obtain high quality spectra as many as possible. Spectra of 49129 stars have been obtained in LAMOST-MRS-B field and released in DR8, of which 28828 and 3375 stars have been visited more than twice and ten times with SNR ≥ 10, respectively. Most of the sources are B-, A-, and F-type stars with –0.6 < [Fe/H] < 0.4 dex. We also obtain 347 identified variable and exotic stars and about 250 stars with [Fe/H] < –1 dex. We measure radial velocities (RVs) by using 892233 spectra of the stars. The uncertainties of RV achieve about 1 km ⋅ s−1 and 10 km ⋅ s−1 for 95% of late- and early-type stars, respectively. The datasets presented in this paper are available at http://www.doi.org/10.57760/sciencedb.j00113.00035.
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- 2022
12. Existence of positive solutions for some boundary value problem with parameter.
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Li-Fang Li
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- 2011
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13. Entanglement entropy in a holographic p-wave superconductor model
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Li-Fang Li, Rong-Gen Cai, Li Li, and Chao Shen
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Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
In a recent paper, arXiv:1309.4877, a holographic p-wave model has been proposed in an Einstein–Maxwell-complex vector field theory with a negative cosmological constant. The model exhibits rich phase structure depending on the mass and the charge of the vector field. We investigate the behavior of the entanglement entropy of dual field theory in this model. When the above two model parameters change, we observe the second order, first order and zeroth order phase transitions from the behavior of the entanglement entropy at some intermediate temperatures. These imply that the entanglement entropy can indicate not only the occurrence of the phase transition, but also the order of the phase transition. The entanglement entropy is indeed a good probe to phase transition. Furthermore, the “retrograde condensation” which is a sub-dominated phase is also reflected on the entanglement entropy.
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- 2015
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14. Holographic Phase Transition Probed by Nonlocal Observables
- Author
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Xiao-Xiong Zeng and Li-Fang Li
- Subjects
Physics ,QC1-999 - Abstract
From the viewpoint of holography, the phase structure of a 5-dimensional Reissner-Nordström-AdS black hole is probed by the two-point correlation function, Wilson loop, and entanglement entropy. As the case of thermal entropy, we find for all the probes that the black hole undergoes a Hawking-Page phase transition, a first-order phase transition, and a second-order phase transition successively before it reaches a stable phase. In addition, for these probes, we find that the equal area law for the first-order phase transition is valid always and the critical exponent of the heat capacity for the second-order phase transition coincides with that of the mean field theory regardless of the size of the boundary region.
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- 2016
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15. Natural antioxidants from traditional Chinese medicinal plants.
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Li Sha, Li Sha, primary, Li ShuKe, Li ShuKe, additional, Li HuaBin, Li HuaBin, additional, Xu XiangRong, Xu XiangRong, additional, Li Fang, Li Fang, additional, Wu Shan, Wu Shan, additional, and Li AnNa, Li AnNa, additional
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- 2014
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16. Kuwanon G protects HT22 cells from advanced glycation end product-induced damage
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Wen-Qian Zhang, Hua Zhou, Tingting Zhao, Wen-Jun Gan, Junling Gu, Youhua Xu, Heng-Li Guo, Li-Fang Li, Ding-Kun Gui, Li-Li Yu, Yong Xu, and Chenlin Gao
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Kuwanon G ,Cancer Research ,medicine.medical_specialty ,Population ,Superoxide dismutase ,chemistry.chemical_compound ,Immunology and Microbiology (miscellaneous) ,Glycation ,Internal medicine ,medicine ,education ,Protein kinase B ,PI3K/AKT/mTOR pathway ,chemistry.chemical_classification ,Reactive oxygen species ,education.field_of_study ,biology ,diabetes ,Chemistry ,Glutathione peroxidase ,advanced glycation end products ,General Medicine ,Articles ,encephalopathy ,acetylcholine ,Endocrinology ,biology.protein ,Advanced glycation end-product - Abstract
The incidence of diabetic encephalopathy is increasing as the population ages. Evidence suggests that formation and accumulation of advanced glycation end products (AGEs) plays a pivotal role in disease progression, but limited research has been carried out in this area. A previous study demonstrated that Kuwanon G (KWG) had significant anti-oxidative stress and anti-inflammatory properties. As AGEs are oxidative products and inflammation is involved in their generation it is hypothesized that KWG may have effects against AGE-induced neuronal damage. In the present study, mouse hippocampal neuronal cell line HT22 was used. KWG was shown to significantly inhibit AGE-induced cell apoptosis in comparison with a control treatment, as determined by both MTT and flow cytometry. Compared with the AGEs group, expression of pro-apoptotic protein Bax was reduced and expression of anti-apoptotic protein Bcl-2 was increased in the AGEs + KWG group. Both intracellular and extracellular levels of acetylcholine and choline acetyltransferase were significantly elevated after KWG administration in comparison with controls whilethe level of acetylcholinesterase decreased. These changes in protein expression were accompanied by increased levels of superoxide dismutase and glutathione peroxidase synthesis and reduced production of malondialdehyde and reactive oxygen species. Intracellular signaling pathway protein levels were determined by western blot and immunocytochemistry. KWG administration was found to prevent AGE-induced changes to the phosphorylation levels of Akt, IκB-α, glycogen synthase kinase 3 (GSK3)-α and β, p38 MAPK and NF-κB p65 suggesting a potential neuroprotective effect of KWG against AGE-induced damage was via the PI3K/Akt/GSK3αβ signaling pathway. The findings of the present study suggest that KWG may be a potential treatment for diabetic encephalopathy.
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- 2021
17. Quantifying Event‐Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR‐MHD Simulation
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Chi Wang, Lei Dai, Binbin Tang, Mohammad Barani, Li‐Fang Li, Gang Zeng, Weichao Tu, Chao Wei, and James L. Burch
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Physics ,010504 meteorology & atmospheric sciences ,Electron ,01 natural sciences ,Computational physics ,symbols.namesake ,Geophysics ,Space and Planetary Science ,Radial diffusion ,Van Allen radiation belt ,0103 physical sciences ,symbols ,Magnetohydrodynamics ,Event specific ,010303 astronomy & astrophysics ,0105 earth and related environmental sciences - Published
- 2020
18. Absolute physical parameters of three poorly studied detached eclipsing binaries
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Quan-Wang Han, Dao-Ye Yang, and Li-Fang Li
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Physics ,Orbital elements ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Radial velocity ,Stars ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,0103 physical sciences ,Binary system ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
The photometric and spectroscopic data for three double-lined detached eclipsing binaries were collected from the photometric and spectral surveys. The light and radial velocity curves of each binary system were simultaneously analyzed using Wilson-Devinney (WD) code, and the absolute physical and orbital parameters of these binaries were derived. The masses of both components of ASASSN-V J063123.82+192341.9 were found to be M 1 = 1.088 ± 0.016 and M 2 = 0.883 ± 0.016 M ⊙; those of ASAS J011416+0426.4 were determined to be M 1 = 0.934 ± 0.046 and M 2 = 0.754 ± 0.043 M ⊙; and those of MW Aur were derived to be M 1 = 2.052 ± 0.196 and M 2 = 1.939 ± 0.193 M ⊙. Finally, the evolutionary status of these detached binaries was discussed based on their absolute parameters and the theoretical stellar models.
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- 2020
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19. Thermodynamics in Loop Quantum Cosmology
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Li-Fang Li and Jian-Yang Zhu
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Physics ,QC1-999 - Abstract
Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. Moreover, the effective loop quantum cosmology gives a successful description of the universe in the semiclassical region. We consider the apparent horizon of the Friedmann-Robertson-Walker universe as a thermodynamical system and investigate the thermodynamics of LQC in the semiclassical region. The effective density and effective pressure in the modified Friedmann equation from LQC not only determine the evolution of the universe in LQC scenario but also are actually found to be the thermodynamic quantities. This result comes from the energy definition in cosmology (the Misner-Sharp gravitational energy) and is consistent with thermodynamic laws. We prove that within the framework of loop quantum cosmology, the elementary equation of equilibrium thermodynamics is still valid.
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- 2009
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20. Binary black hole mergers inf(R)theory
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Zhoujian Cao, Pablo Galaviz, and Li-Fang Li
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- 2013
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21. Effects of the health belief model following acute exacerbation of chronic obstructive pulmonary disease in a hospital in China
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Li-Fang Li, Mei Ji, Chen Yu, Chun-Mei Chen, Ai-Hong Wang, Ya-Hui Shen, and Jun Ye
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Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Acute exacerbation of chronic obstructive pulmonary disease ,Symptom management ,business.industry ,Multidimensional Fatigue Inventory ,After discharge ,medicine.disease ,03 medical and health sciences ,0302 clinical medicine ,030228 respiratory system ,Internal medicine ,medicine ,Health belief model ,Anxiety ,Original Article ,030212 general & internal medicine ,medicine.symptom ,business ,Anxiety scale - Abstract
BACKGROUND: This study aims to investigate the effects of education with health belief model (HBM) on anxiety and fatigue among patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD). METHODS: Patients with AECOPD admitted into Taizhou People’s Hospital, Jiangsu, China between December 2012 and October 2013 were randomly selected for the present study according to random number table. A total of 99 cases with anxiety were included. These patients were divided into two groups: experimental group educated by HBM (n=47), and control group educated by conventional method (n=52). The scores for anxiety and fatigue were evaluated using the self-rating anxiety scale (SAS) and multidimensional fatigue inventory (MFI-20). RESULTS: After educational intervention by HBM, patients achieved a significant decrease in anxiety and fatigue scores, when compared to patients in the control group, who were educated by the conventional method at the time of admission, discharge, and 6 weeks after discharge (P
- Published
- 2019
22. A photometric study of the high-mass-ratio contact binary AV Puppis
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Dengkai Jiang, Li-Fang Li, and Quan-Wang Han
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Physics ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Contact binary ,Astrophysics ,Mass ratio ,Light curve ,Orbital period ,01 natural sciences ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Mass transfer ,0103 physical sciences ,High mass ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
The multi-color photometric light curves for a contact binary AV Puppis (AV Pup) in $VR_cI_c$ bandpasses are presented, and they are analyzed by using of the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ($q=m_2/m_1= 0.896$) and a fill-out factor ($f=10\%$). Combining with our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The $O-C$ analysis shows that the orbital period of AV Pup is increasing at a rate of $\mathrm{d}P/\mathrm{d}t=4.83 \times 10^{-7} \ \mathrm{days \ yr^{-1}}$, which can be explained by mass transfer from the less massive component to the more massive one., 9 pages, 4 figures
- Published
- 2019
23. Comparison of dominant hand to non-dominant hand in conduction of reaching task from 3D kinematic data: Trade-off between successful rate and movement efficiency
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Li Fang Li, Le Li, Xiang Xiao, and Hui Jing Hu
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Adult ,Male ,Shoulder ,Fast speed ,Lower velocity ,Movement ,02 engineering and technology ,Kinematics ,Wrist ,Functional Laterality ,Young Adult ,Imaging, Three-Dimensional ,Trunk rotation ,0502 economics and business ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Humans ,Mathematics ,Analysis of Variance ,Movement (music) ,Applied Mathematics ,05 social sciences ,Extremities ,General Medicine ,Geodesy ,Healthy Volunteers ,Biomechanical Phenomena ,Computational Mathematics ,medicine.anatomical_structure ,Peak velocity ,Motor Skills ,Modeling and Simulation ,020201 artificial intelligence & image processing ,Distal segment ,Female ,General Agricultural and Biological Sciences ,050203 business & management - Abstract
This study aimed to investigate the effects of handedness on motion accuracies and to compare 3D kinematic data in reaching performance of dominant and non-dominant hand with the influence of movement speed and target locations. Twelve healthy young adults used self-selected and fast speed to reach for three different target locations as follows: frontal, ipsilateral and contralateral to the performing hand, with equal distance. Both hands were tested and kinematic parameters were recorded by 3D motion analysis system. Successful rate, reach path ratio, mean and peak velocity, the timing of peak velocity and ROM of joints were analyzed. Reach path ratio was smaller when using the dominant hand (p < 0.01) and fast speed (p < 0.01) to perform the movement, but the successful rate of the dominant hand was lower than non-dominant hand during fast speed reaching (99.1% vs 100%). Contralateral movement had lower velocity than the other two target locations, while velocity did not vary between non-dominant and dominant hand. The timing of peak velocity occurred significantly later for fast speed movements (p < 0.01). Trunk rotation was significantly smaller when using the dominant hand, fast movement speed or reaching to the ipsilateral target. The ROM of elbow and wrist flexion-extension decreased in contralateral reaching. The performance of the dominant hand and/or fast speed movements was more efficient with straighter hand path and less trunk rotation, but the successful rate decreased in dominant hand during fast speed movements. The timing of peak velocity occurred later during fast movement in both hands indicating a decreased feedback phase. Target location can influence movement strategy as reaching to contralateral target required more proximal movements and ipsilateral reaching used more distal segment movements.
- Published
- 2019
24. [Application and effect of enhanced recovery after surgery in early rehabilitation of oral cancer patients after operation]
- Author
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Guo-Qin, Zhang, Li-Fang, Li, Li-Juan, Liu, Yan, Wu, Ai-Rong, Xia, and Zhen-Ran, Gao
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Postoperative Complications ,Humans ,Mouth Neoplasms - Abstract
To explore the application and effect of enhanced recovery after surgery (ERAS) in early rehabilitation of oral cancer patients after operation.Ninety cases of oral cancer admitted from January 2016 to December 2017 were randomly divided into two groups. 45 cases of oral cancer in the experimental group received ERAS nursing after operation, and another 45 patients received routine nursing after operation. The sleep duration, pain and halitosis 3 days after operation; the first time to get out of bed, the length of hospitalization; and the level of albumin and other laboratory indicators 1 and 3 days after operation were observed. SPSS 17.0 software package was used for statistical analysis.After 1 day and 3 day of ERAS intervention, the nutritional index of the experimental group was lower than that of the control group. The time of first ambulation and the length of hospitalization were shorter than those of the control group. The average sleep time 3 days after operation was longer than that of the control group. The incidence of halitosis, wound infection and moderate pain was lower than that of the control group. The difference was statistically significant (P0.05).ERAS nursing after oral cancer surgery can improve the comfort of patients, enhance the clinical outcome, promote rapid recovery of patients, with good clinical application prospects.
- Published
- 2019
25. Neuraxial adjuvants for prevention of perioperative shivering during cesarean section: A network meta-analysis following the PRISMA guidelines
- Author
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Jia-Qi Hu, Dan-Feng Yang, Chun-Lei Wen, Qibiao Wu, Juan Zhang, Li-Fang Li, Yi-Wei Zhang, and Shu-Yang Dai
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animal structures ,business.industry ,Prevention ,Section (typography) ,Shivering ,General Medicine ,Perioperative ,03 medical and health sciences ,0302 clinical medicine ,030220 oncology & carcinogenesis ,Meta-analysis ,Anesthesia ,medicine ,030211 gastroenterology & hepatology ,medicine.symptom ,business ,Cesarean section ,Network meta-analysis ,reproductive and urinary physiology ,Meta-Analysis ,Neuraxial adjuvants - Abstract
BACKGROUND Perioperative shivering is clinically common during cesarean sections under neuraxial anesthesia, and several neuraxial adjuvants are reported to have preventive effects on it. However, the results of current studies are controversial and the effects of these neuraxial adjuvants remain unclear. AIM To evaluate the effects of neuraxial adjuvants on perioperative shivering during cesarean sections, thus providing an optimal choice for clinical application. METHODS A systematic review and network meta-analysis were conducted following the PRISMA (Preferred Reported Items for Systematic Review and Meta-analysis) guidelines. Analyses were performed using Review Manager 5.3 and Stata 14.0. We searched PubMed, EMBASE, Web of Science, and Cochrane Central databases for eligible clinical trials assessing the effects of neuraxial adjuvants on perioperative shivering and other adverse events during cesarean sections. Perioperative shivering was defined as the primary endpoint, and nausea, vomiting, pruritus, hypotension, and bradycardia were the secondary outcomes. RESULTS Twenty-six studies using 9 neuraxial adjuvants for obstetric anesthesia during caesarean sections were included. The results showed that, compared with placebo, pethidine, fentanyl, dexmedetomidine, and sufentanil significantly reduced the incidence of perioperative shivering. Among the four neuraxial adjuvants, pethidine was the most effective one for shivering prevention (OR = 0.15, 95%CI: 0.07-0.35, surface under the cumulative ranking curve 83.9), but with a high incidence of nausea (OR = 3.15, 95%CI: 1.04-9.57) and vomiting (OR = 3.71, 95%CI: 1.81-7.58). The efficacy of fentanyl for shivering prevention was slightly inferior to pethidine (OR = 0.20, 95%CI: 0.09-0.43), however, it significantly decreased the incidence of nausea (OR = 0.34, 95%CI: 0.15-0.79) and vomiting (OR = 0.25, 95%CI: 0.11-0.56). In addition, compared with sufentanil, fentanyl showed no impact on haemodynamic stability and the incidence of pruritus. CONCLUSION Pethidine, fentanyl, dexmedetomidine, and sufentanil appear to be effective for preventing perioperative shivering in puerperae undergoing cesarean sections. Considering the risk-benefit profiles of the included neuraxial adjuvants, fentanyl is probably the optimal choice.
- Published
- 2019
26. Holographic Phase Transition Probed by Nonlocal Observables
- Author
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Li-Fang Li and Xiao-Xiong Zeng
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Physics ,Quantum phase transition ,Nuclear and High Energy Physics ,Phase transition ,Article Subject ,Condensed matter physics ,010308 nuclear & particles physics ,Critical phenomena ,01 natural sciences ,lcsh:QC1-999 ,Black hole ,General Relativity and Quantum Cosmology ,Mean field theory ,Quantum critical point ,Quantum mechanics ,0103 physical sciences ,010306 general physics ,Entropy (arrow of time) ,Critical exponent ,lcsh:Physics - Abstract
From the viewpoint of holography, the phase structure of a 5-dimensional Reissner-Nordström-AdS black hole is probed by the two-point correlation function, Wilson loop, and entanglement entropy. As the case of thermal entropy, we find for all the probes that the black hole undergoes a Hawking-Page phase transition, a first-order phase transition, and a second-order phase transition successively before it reaches a stable phase. In addition, for these probes, we find that the equal area law for the first-order phase transition is valid always and the critical exponent of the heat capacity for the second-order phase transition coincides with that of the mean field theory regardless of the size of the boundary region.
- Published
- 2016
27. First report of tomato spotted wilt virus in Argyranthemum frutescens in China
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Li-Fang Li, Yan Liang, and Chen-Qing Yuan
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Horticulture ,biology ,Plant Science ,Argyranthemum ,biology.organism_classification ,Tomato spotted wilt virus - Published
- 2020
28. The Common Fault Analysis and the Solution of CKA6140 NC Lathe
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Li Fang Li
- Subjects
Engineering ,business.industry ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Control engineering ,Hardware_PERFORMANCEANDRELIABILITY ,General Medicine ,Troubleshooting ,Servomechanism ,Fault (power engineering) ,law.invention ,law ,Embedded system ,Fault analysis ,Tool holder ,business - Abstract
Many types of CNC lathes fault generally can be divided into five categories: CNC device fault; servo system fault; tool holder system fault; spindle system fault and other parts fault. Common fault as long as the correct analysis and judgment is not difficult to troubleshoot.
- Published
- 2015
29. Long non-coding RNA SOX21-AS1 sponges miR-145 to promote the tumorigenesis of colorectal cancer by targeting MYO6
- Author
-
An-Wei Wei and Li-Fang Li
- Subjects
0301 basic medicine ,Male ,Colorectal cancer ,Carcinogenesis ,Regulator ,Biology ,medicine.disease_cause ,Cell Line ,03 medical and health sciences ,0302 clinical medicine ,Cell Movement ,Cell Line, Tumor ,microRNA ,medicine ,Gene silencing ,Humans ,Cell Proliferation ,Pharmacology ,Myosin Heavy Chains ,HEK 293 cells ,General Medicine ,Middle Aged ,medicine.disease ,HCT116 Cells ,Prognosis ,digestive system diseases ,Long non-coding RNA ,Gene Expression Regulation, Neoplastic ,MicroRNAs ,030104 developmental biology ,HEK293 Cells ,Tumor progression ,030220 oncology & carcinogenesis ,SOXB2 Transcription Factors ,Cancer research ,Female ,RNA, Long Noncoding ,Colorectal Neoplasms ,HT29 Cells - Abstract
Emerging evidences have proved that long non-coding RNAs (lncRNAs) act as important molecular regulator in the tumor progression, including colorectal cancer (CRC). LncRNA SOX21-AS1 has been verified as oncogenic molecular in other cancers and tumorigenesis. In present study, our team investigates the clinical characteristic and molecular function in CRC carcinogenesis. Results showed that lncRNA SOX21-AS1 expression was significantly over-expressed in CRC tissue samples and cells. The aberrant over-expression of SOX21-AS1 indicated poor prognosis of CRC patients. In vitro and in vivo validation experiments, SOX21-AS1 silencing inhibited the proliferation, invasion, and decreased the tumor growth of CRC cells. Moreover, miR-145 was proved to be the target of SOX21-AS1, besides, myosin VI (MYO6) was found to be one of the targets of miR-145 using bioinformatics prediction programs and rescue confirmation experiments. In summary, our study reveals the tumorigenic effect of lncRNA SOX21-AS1 in CRC cells via targeting miR-145/MYO6, providing a novel insight for CRC carcinogenesis.
- Published
- 2017
30. Server Design of Personal Cloud Sync Storage System
- Author
-
Bing Jiang, Xiao Qing Xue, Li Fang Li, and Fu Zhang
- Subjects
business.industry ,Computer science ,sync ,General Medicine ,computer.software_genre ,Personal cloud ,Workflow ,Server farm ,Computer data storage ,Operating system ,Systems architecture ,Server design ,Android (operating system) ,business ,computer - Abstract
This paper introduces the server design of a personal cloud sync storage system based on Android mobile terminal, including system architecture, workflow and module design. According to the application characteristics of personal cloud, this thesis selects Servlet as the core development technology of server-side system, describes the development process of the personal cloud server based on Tomcat container and establishes a secure connection between the mobile terminal and the personal cloud server center. Under the LAN environment, the server system has successfully completed the function module of the test and assembly verification test. Test results show that the whole system runs in good condition and has certain applicative value.
- Published
- 2014
31. Van der Waals phase transition in the framework of holography
- Author
-
Li-Fang Li and Xiao-Xiong Zeng
- Subjects
Physics ,High Energy Physics - Theory ,Phase transition ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,Quantum entanglement ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,lcsh:QC1-999 ,symbols.namesake ,Correlation function ,High Energy Physics - Theory (hep-th) ,Quantum mechanics ,0103 physical sciences ,symbols ,van der Waals force ,010306 general physics ,Entropy (arrow of time) ,Critical exponent ,lcsh:Physics ,Quintessence - Abstract
Phase structure of the quintessence Reissner-Nordstr\"{o}m-AdS black hole is probed with the nonlocal observables such as holographic entanglement entropy and two point correlation function. Our result shows that, as the case of the thermal entropy, both the observables exhibit the similar Van der Waals-like phase transition. To reinforce the conclusion, we further check the equal area law for the first order phase transition and critical exponent of the heat capacity for the second order phase transition. We also discuss the effect of the state parameter on the phase structure of the nonlocal observables., Comment: 16 pages, 6 figures. arXiv admin note: text overlap with arXiv:1511.00383
- Published
- 2016
32. Phase structure of the Born–Infeld–anti-de Sitter black holes probed by non-local observables
- Author
-
Xiao-Xiong Zeng, Li-Fang Li, and Xian-Ming Liu
- Subjects
High Energy Physics - Theory ,Physics ,Phase transition ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,Black hole ,symbols.namesake ,High Energy Physics - Theory (hep-th) ,Correlation function ,Quantum mechanics ,0103 physical sciences ,symbols ,Anti-de Sitter space ,van der Waals force ,010306 general physics ,Engineering (miscellaneous) ,Critical exponent ,Phase diagram - Abstract
With the non-local observables such as two point correlation function and holographic entanglement entropy, we probe the phase structure of the Born-Infeld-anti-de Sitter black holes. We find for the case $bQ>0.5$, the phase structure is similar to that of the Reissner-Nordstr��m-AdS black hole, namely the black hole undergoes a Hawking-Page phase transition, a first order phase transition, and a second order phase transition. While for the case $bQ, 20 pages, many figures. arXiv admin note: text overlap with arXiv:1512.08855
- Published
- 2016
33. CONSORT—Assistive technology-180° rotating eating spoon improves the ability of eating of self-care patients with upper extremity dyskinesia
- Author
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Li-Fang Li, Gui-Wei Lu, Yu-Long Zhao, and Jin-Xia Sun
- Subjects
medicine.medical_specialty ,business.industry ,MEDLINE ,General Medicine ,nervous system diseases ,03 medical and health sciences ,0302 clinical medicine ,Physical medicine and rehabilitation ,Dyskinesia ,030220 oncology & carcinogenesis ,Assistive technology ,medicine ,Self care ,030212 general & internal medicine ,medicine.symptom ,business ,Self-Help Devices - Abstract
Objective:This study aims to develop an assistive technology-180° rotating feeding spoon that could improve the ability of eating of self-care patients with upper extremity dyskinesia.Methods:The Brunnstrom 6-stage rating of hemiplegia was adopted. During the different recovery stages of the
- Published
- 2019
34. Experimental investigation of loss and gain characteristics of an abnormal InxGa1-xAs/GaAs quantum well structure
- Author
-
Yan Jia, Yan Jia, primary, Qingnan Yu, Qingnan Yu, additional, Fang Li, Fang Li, additional, Mingqing Wang, Mingqing Wang, additional, Wei Lu, Wei Lu, additional, Jian Zhang, Jian Zhang, additional, Xing Zhang, Xing Zhang, additional, Yongqiang Ning, Yongqiang Ning, additional, and Jian Wu, Jian Wu, additional
- Published
- 2018
- Full Text
- View/download PDF
35. DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields
- Author
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Rui Ma, Rui Ma, primary, Wentao Zhang, Wentao Zhang, additional, Wenzhu Huang, Wenzhu Huang, additional, and Fang Li, Fang Li, additional
- Published
- 2018
- Full Text
- View/download PDF
36. An Analysis on the Payment of Urban Medical Insurance for Community Outpatients of Two Groups
- Author
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Weiqun Shi, Li-Fang Li, Xian Wang, and Zhenlei Hong
- Subjects
Service (business) ,medicine.medical_specialty ,business.industry ,Applied Mathematics ,General Mathematics ,media_common.quotation_subject ,Medical underwriting ,Group insurance ,Payment ,Medical insurance ,Community health center ,Family medicine ,Settlement (finance) ,Medicine ,Statistical analysis ,business ,health care economics and organizations ,media_common - Abstract
Objective. Achieving effective supervision of medical insurance and adopting measures for appropriate payment of basic medical insurance under the family physician system, through the analysis of two groups of urban workers in the Community Health Center. Methods. A statistical analysis was made on the settlement data of basic medical insurance for outpatients consisting of urban workers in the Community Health Center, using SPSS and Excel. Result. The administrative departments of Medicare should strengthen the supervision of specific groups, and carry out application of the hybrid medical insurance payment methods, which can effectively improve the use of medical insurance funds, and make the family doctor service more targeted. Conclusion. Strengthening the supervision of the specific groups can effectively improve the efficiency of the supervision of medical insurance, and different medical insurance payment methods for two groups of outpatients under the family doctor system of the Community ...
- Published
- 2013
37. Research on Improved Ant Colony Algorithm for the Optimization of the Large Storage Picking Path Based on RFID
- Author
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Li Fang Li, Yong Bo Wang, and Pei Zhi Wen
- Subjects
Set (abstract data type) ,Engineering ,Mathematical optimization ,Operator (computer programming) ,Response strategy ,business.industry ,Ant colony optimization algorithms ,Path (graph theory) ,Convergence (routing) ,General Medicine ,business ,Selection (genetic algorithm) ,Randomness - Abstract
For the realtime updating and strong randomness of the information, large RFID-based warehousing picking path optimization job requires to make decision continuously. It is different from the traditional picking path Problem. This paper proposed an Improved Ant Colony algorithm in order to solve the optimization of the large storage picking path based on RFID. Distributed Strategy, Dynamic Response Strategy and Time Waiting Strategy are adopted to improve the candidate set, meanwhile, adjust operator and parameter selection. Experimental results show that the convergence speed of this algorithm with high precision, a better solution to the optimization of picking operation based on RFID.
- Published
- 2012
38. Parameter Estimation and Restoration of Motion-Blurred Images
- Author
-
Kai Guo, Li Fang Li, and Pei Zhi Wen
- Subjects
Point spread function ,Estimation theory ,business.industry ,Wiener filter ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Motion (geometry) ,Image processing ,General Medicine ,Field (computer science) ,symbols.namesake ,Computer Science::Graphics ,Fourier transform ,Computer Science::Computer Vision and Pattern Recognition ,symbols ,Computer vision ,Artificial intelligence ,business ,Image restoration ,ComputingMethodologies_COMPUTERGRAPHICS ,Mathematics - Abstract
The motion-blurred image restoration has been the difficulty of the field of image processing. In this paper, proposed a motion-blurred length method based on Fourier transform of the parameter estimation method. The method improved the accuracy of the blurred length estimation. The method improved the effect of the motion-blurred image restoration. The experiments verified that the accuracy and feasibility of the method proposed.
- Published
- 2012
39. RFID Indoor Localization Algorithm Based on PSO
- Author
-
Li Fang Li, Pei Zhi Wen, and Ting Ting Su
- Subjects
Engineering ,business.industry ,RFID Localization ,Gaussian blur ,Swarm behaviour ,General Medicine ,Multipath transmission ,symbols.namesake ,Signal strength ,Robustness (computer science) ,symbols ,Lower cost ,business ,Algorithm - Abstract
In order to improve the positioning accuracy and reduce the localization cost, a kind of PSO-based RFID indoor localization algorithm is proposed in this paper. The main idea of this algorithm contains the following two aspects. First, due to the influence of none line of sight and multipath transmission in indoor environment, we adopt Gaussian Smoothing Filter to process Received Signal Strength Indicator (RSSI) values, which can reduce the impact of environmental factors on the position estimation effectively. Second, Particle of Swarm Optimization (PSO) algorithm is introduced to obtain a better positioning result. By experimenting in different indoor environment, the results demonstrate that the proposed approach can not only improve the precision of indoor localization, but has a lower cost and better robustness when compared to VIRE approach.
- Published
- 2012
40. Holographic Van der Waals-like phase transition in the Gauss-Bonnet gravity
- Author
-
Xiao-Xiong Zeng, Song He, and Li-Fang Li
- Subjects
Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,Phase transition ,Wilson loop ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,AdS/CFT correspondence ,symbols.namesake ,Correlation function ,High Energy Physics - Theory (hep-th) ,Gauss–Bonnet gravity ,Quantum mechanics ,0103 physical sciences ,symbols ,lcsh:QC770-798 ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,van der Waals force ,010306 general physics ,Critical exponent - Abstract
The Van der Waals-like phase transition is observed in temperature-thermal entropy plane in spherically symmetric charged Gauss-Bonnet-AdS black hole background. In terms of AdS/CFT, the non-local observables such as holographic entanglement entropy, Wilson loop, and two point correlation function of very heavy operators in the field theory dual to spherically symmetric charged Gauss-Bonnet-AdS black hole have been investigated. All of them exhibit the Van der Waals-like phase transition for a fixed charge parameter or Gauss-Bonnet parameter in such gravity background. Further, with choosing various values of charge or Gauss-Bonnet parameter, the equal area law and the critical exponent of the heat capacity are found to be consistent with phase structures in temperature-thermal entropy plane., Some statements about the analogy between the black hole phase transition in $T-S$ plane and Van der Waals-like phase transition in $P-V$ plane are added. This is the published version
- Published
- 2016
41. Binary Black Hole merger in f(R) theory
- Author
-
Li Fang Li, Pablo Galaviz, and Zhoujian Cao
- Subjects
Physics ,Nuclear and High Energy Physics ,General relativity ,Speed of gravity ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,General Relativity and Quantum Cosmology ,Black hole ,Numerical relativity ,Theoretical physics ,Classical mechanics ,Binary black hole ,Extremal black hole ,Black brane ,Gravitational redshift - Abstract
In the near future, gravitational wave detection is set to become an important observational tool for astrophysics. It will provide us with an excellent means to distinguish different gravitational theories. In effective form, many gravitational theories can be cast into an f(R) theory. In this article, we study the dynamics and gravitational waveform of an equal-mass binary black hole system in f(R) theory. We reduce the equations of motion in f(R) theory to the Einstein-Klein-Gordon coupled equations. In this form, it is straightforward to modify our existing numerical relativistic codes to simulate binary black hole mergers in f(R) theory. We considered binary black holes surrounded by a shell of scalar field. We solve the initial data numerically using the Olliptic code. The evolution part is calculated using the extended AMSSNCKU code. Both codes were updated and tested to solve the problem of binary black holes in f(R) theory. Our results show that the binary black hole dynamics in f(R) theory is more complex than in general relativity. In particular, the trajectory and merger time are strongly affected. Via the gravitational wave, it is possible to constrain the quadratic part parameter of f(R) theory in the range |a_2, 14 pages, 16 figures
- Published
- 2016
- Full Text
- View/download PDF
42. Study on the Inclusion Complex of Rutin/Sulfobutylether-β-Cyclodextrin
- Author
-
Yong En Guo, Shao Peng Wen, Xiao Guang Niu, Ying Liu, Cai Ju Zhou, and Li Fang Li
- Subjects
Chromatography ,Aqueous solution ,medicine.diagnostic_test ,Chemistry ,General Engineering ,Sulfobutylether β cyclodextrin ,Rutin ,chemistry.chemical_compound ,Differential scanning calorimetry ,Spectrophotometry ,Phase (matter) ,medicine ,Solubility ,Dissolution - Abstract
The inclusion complexes of rutin/sulfobutylether-β-cyclodextrin (SBE-β-CD) were prepared by grinding, co-precipitation and ultrasonic method and then identified with differential scanning calorimetry (DSC) and UV-visible spectrophotometry (UV). The molar ratio 1∶1 of rutin to SBE-β-CD in the complex was confirmed by phase solubility studies, and the dissolutions of rutin/SBE-β-CD were investigated by UV. The dissolution of rutin included in the complex showed significant increases in aqueous solution. The rutin/SBE-β-CD inclusion complex exhibited unique physical characteristics that are different from rutin.
- Published
- 2012
43. Gravitational wave detection: stochastic resonance method with matched filtering
- Author
-
Li-Fang Li and Jian-Yang Zhu
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,Gravitational wave ,Noise (signal processing) ,business.industry ,Stochastic resonance ,Matched filter ,Signal ,Gravitational-wave astronomy ,symbols.namesake ,Fourier transform ,Optics ,symbols ,Interferometric gravitational wave detector ,business ,Algorithm - Abstract
Along with the development of the interferometric gravitational wave detector, we enter into an epoch of the gravitational wave astronomy, which will open a brand new window for astrophysics to observe our universe. However, the gravitational wave detection is a typical weak signal detection, and this weak signal is buried in a strong instrument noise. To our knowledge, almost all of the data analysis methods in gravitational wave detection at present are based on a matched filtering. So it is desirable to take advantage of stochastic resonance methods. However, the all of the stochastic resonance methods are general based on a Fourier transformation and fall short of the matched filtering as a usable technique. In this paper we relate the stochastic resonance to the matched filtering. Our results show that the stochastic resonance can indeed be combined with the matched filtering for both the periodic and the non-periodic input signal. This encouraging result will be the first step to apply the stochastic resonance to the matched filtering in gravitational wave detection. Moreover, based on the matched filtering, we firstly propose a novel measurement method for the stochastic resonance which is valid for both the periodic and the non-periodic driven signal.
- Published
- 2011
44. Synthesis and Characterization of Camptothecin Intercalated into Mg/Al Layered Double Hydroxide
- Author
-
Li-Fang Li, Wan-Guo Hou, Yan Li, and Chun-Xia Liu
- Subjects
endocrine system ,endocrine system diseases ,Chemistry ,Coprecipitation ,Metal ions in aqueous solution ,Bilayer ,Intercalation (chemistry) ,Nanotechnology ,General Chemistry ,Controlled release ,digestive system diseases ,chemistry.chemical_compound ,Monolayer ,medicine ,Hydroxide ,heterocyclic compounds ,neoplasms ,Camptothecin ,medicine.drug ,Nuclear chemistry - Abstract
The intercalation of camptothecin (CPT) into a layered inorganic host, Mg-Al layered double hydroxide (LDH), was carried out using a coprecipitation method to obtain CPT-LDH nanohybrids. It was found that the intercalated amounts (Ain) of CPT-LDH nanohybrids were remarkably dependent on the molar ratios (RC/M) of CPT to metal ions in raw materials. The Ain value increases with the RC/M value increasing. According to the gallery heights of CPT-LDH and sizes of CPT molecule, a probably morphology of CPT molecules in the gallery of LDH was suggested that the horizontal-arranged monolayer and vertical-arranged bilayer of CPT molecules coexisted in the interlayer region of LDH. An interesting result was found that the gallery height corresponding to the bilayer of CPT-LDH sample with a high Ain value was remarkably lower than that with low Ain value. The in vitro CPT release examinations from the nanohybrids showed that the CPT-LDH nanohybrids were a potential drug controlled release system. The kinetic analysis showed that the release kinetics of CPT from the nanohybrids obeyed the pseudo-first order kinetic model and the diffusion of CPT through the LDH particle of CPT played an important role in controlling the drug release rate.
- Published
- 2008
45. Investigation of trace p-dichlorobenzene using laser mass spectrometry
- Author
-
Jing Ma Jing Ma, Lei Ding Lei Ding, Li Fang Li Fang, and Weijun Zhang Weijun Zhang
- Subjects
Materials science ,Mass spectrometry ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Wavelength ,law ,Excited state ,Ionization ,Mass spectrum ,Laser power scaling ,Electrical and Electronic Engineering ,Atomic physics ,Ground state - Abstract
The time-of-flight mass spectrum (TOFMS) relative to the resonant two-photon ionization of gas phase p-dichlorobenzene was obtained in the wavelength range of 240-250 nm by a home-made system. A special design was made to reduce the effect of memory on the inner wall of the sample inlet system suitable for the investigation of semi-volatile organic compound. In this wavelength range, p-dichlorobenzene molecules firstly absorbed one photon to be excited from the ground state 1Ag(S0) to the first excited state 1B2u(S1), then absorbed another photon to be ionized. The relationship between the signal intensity of p-dichlorobenzene molecular ion C6H435Cl+2 at 248-nm wavelength and the laser power was given. The 1.52 power index of C6H435Cl+2 was a typical identification of the 3/2 power law. The relationship between the ion signal intensity of C6H435Cl+2 and the sample concentration was close to a linear one in the ppm(V/V) range, which led to a detection limit of 125 ppb(V/V) for p-dichlorobenzene.
- Published
- 2008
46. Introduction to Holographic Superconductor Models
- Author
-
Li-Fang Li, Rong-Gen Cai, Run-Qiu Yang, and Li Li
- Subjects
Superconductivity ,Strongly coupled ,Physics ,High Energy Physics - Theory ,010308 nuclear & particles physics ,General relativity ,Holography ,General Physics and Astronomy ,FOS: Physical sciences ,01 natural sciences ,law.invention ,Theoretical physics ,Dimension (vector space) ,High Energy Physics - Theory (hep-th) ,law ,Condensed Matter::Superconductivity ,0103 physical sciences ,Point (geometry) ,010306 general physics - Abstract
In the last years it has been shown that some properties of strongly coupled superconductors can be potentially described by classical general relativity living in one higher dimension, which is known as holographic superconductors. This paper gives a quick and introductory overview of some holographic superconductor models with s-wave, p-wave and d-wave orders in the literature from point of view of bottom-up, and summarizes some basic properties of these holographic models in various regimes. The competition and coexistence of these superconductivity orders are also studied in these superconductor models., 93 pages, 38 figures, 2 tables; v3: misprints corrected, published version. arXiv admin note: text overlap with arXiv:1309.5086, arXiv:1007.1981 by other authors
- Published
- 2015
47. Effect of phantom dark energy on the holographic thermalization
- Author
-
Li-Fang Li, Xin-Yun Hu, and Xiao-Xiong Zeng
- Subjects
Physics ,High Energy Physics - Theory ,010308 nuclear & particles physics ,Holography ,General Physics and Astronomy ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Plasma ,01 natural sciences ,Imaging phantom ,law.invention ,Black hole ,Acceleration ,AdS/CFT correspondence ,Thermalisation ,High Energy Physics - Theory (hep-th) ,law ,0103 physical sciences ,Dark energy ,Atomic physics ,010306 general physics - Abstract
Gravitational collapse of a shell of charged dust surrounded by the phantom dark energy is probed by the minimal area surface, which is dual to probe the thermalization in the boundary quantum field by expectation values of Wilson loop in the framework of the AdS/CFT correspondence. We investigated mainly the effect of the phantom dark energy parameter and chemical potential on the thermalization. The result shows that the smaller the phantom dark energy parameter is, the easier the plasma thermalizes as the chemical potential is fixed, and the larger the chemical potential is, the harder the plasma thermalizes as the dark energy parameter is fixed. We get the fitting function of the thermalization curve and with it, the thermalization velocity and thermalization acceleration are discussed., Comment: arXiv admin note: text overlap with arXiv:1412.3878, arXiv:1405.5745 by other authors
- Published
- 2015
- Full Text
- View/download PDF
48. Object Extraction in Optical Measurement Image Based on the Channel Module in Photoshop
- Author
-
Li-fang Li
- Subjects
Channel (digital image) ,Computer science ,business.industry ,Computer graphics (images) ,Computer vision ,Extraction (military) ,Image processing ,Artificial intelligence ,Object (computer science) ,business ,Image based - Published
- 2015
49. Studies on intrinsic ionization constants of Fe–Al–Mg hydrotalcite-like compounds
- Author
-
Shu-Hua Han, Wei-An Zhao, Shu-Ping Li, Wanguo Hou, and Li-Fang Li
- Subjects
Hydrotalcite ,Magnesium ,Coprecipitation ,Aluminium hydroxide ,Analytical chemistry ,Charge density ,chemistry.chemical_element ,Crystal structure ,Acid dissociation constant ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Ionization - Abstract
The theoretical analysis of the intrinsic ionization constant (K(a2)(int)) of Fe-Al-Mg hydrotalcite-like compounds (HTlc) possessing permanent charges was first performed using the double extrapolation method proposed by James et al. The theoretical permanent charge density (sigma(p,T)) of the HTlc sample was calculated from the crystal structure of HTlc, and the influence of sigma(p,T) on the K(a2)(int) was also examined. From the experimental results, these conclusions can be obtained: the zero point of the charge (pH(ZPC)) of Fe-Al-Mg HTlc increases with decreased Fe3+ content and increases with increased Mg2+ in the HTlc. The pK(a2)(int) of Fe-Al-Mg HTlc also increases with decreased Fe3+ and increased Mg2+ content in the sample; furthermore, the pK(a2)(int) of Fe-Al-Mg HTlc increases with decreased sigma(p,T).
- Published
- 2003
50. Gravitational lensing effects on parameter estimation in gravitational wave detection with advanced detectors
- Author
-
Zhoujian Cao, Yang Wang, and Li-Fang Li
- Subjects
Physics ,Nuclear and High Energy Physics ,Einstein Telescope ,Gravitational wave ,Gravitational lensing formalism ,Strong gravitational lensing ,Astronomy ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,LIGO ,Black hole ,General Relativity and Quantum Cosmology ,Gravitational lens ,Weak gravitational lensing - Abstract
The gravitational lensing effect is important to the detection of electromagnetic signals in astrophysics. The gravitational wave lensing effect has also been found significant to gravitational wave detection in the past decade. Recent analysis shows that the lensing events for advanced detectors could be quite plausible. The black holes in our Milky Way Galaxy may play the role of lens objects. These facts motivate us to study the lensing effects on gravitational wave signals for advanced detectors. Taking advanced LIGO and Einstein Telescope for examples, we investigate the lensing effects on the parameter extraction of gravitational wave signals. Using the Markov chain Monte Carlo simulation together with matched filtering methods, we find that the lensing effect for a lens object with small mass is negligible. But when the mass of the lens object increases to larger than 1000M(circle dot) the lensing effect becomes important. Using the template without lensing corrections would result in loss of signal detections. In contrast if we consider templates with lensing effects, the lensed signal may provide much information about the lens black hole. These facts may give us a new way to determine the parameters of the lensing object. For example, this kind of signal may also help us estimate the mass and the distance of the supermassive black hole hosted at the center of our Galaxy.
- Published
- 2014
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