78 results on '"S. W. Xu"'
Search Results
2. Roles of circ_0000135/miR-140-3p/PDZK1 network in cervical cancer
- Author
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N. Wang, Y. Zheng, X. Zhang, S. W. Xu, X. H. Li, Y. L. Meng, and J. Q. Liu
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Cancer Research ,Oncology ,General Medicine - Published
- 2022
3. R -matrix analyses for the Li7(t,n)Be9 and Li7(He3,p)Be9 reactions and their improved thermonuclear reaction rates
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J. Hu, N. Tian, Y. Y. Li, S. Q. Hou, S. W. Xu, J. B. Liu, and J. F. Lv
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- 2022
4. Erratum: Quasi-elastic scattering of C10,11 and B10 from a Pbnat target [Phys. Rev. C 90 , 014606 (2014)]
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Y. Y. Yang, J. S. Wang, Q. Wang, D. Y. Pang, J. B. Ma, M. R. Huang, P. Ma, S. L. Jin, J. L. Han, Z. Bai, L. Jin, J. B. Chen, Q. Hu, R. Wada, S. Mukherjee, Z. Y. Sun, R. F. Chen, X. Y. Zhang, Z. G. Hu, X. H. Yuan, S. W. Xu, S. Z. Chen, X. G. Lei, L. X. Liu, W. H. Ma, S. T. Wang, D. Yan, X. H. Zhang, M. H. Zhao, Y. Zhou, Y. J. Zhou, Z. Y. Guo, Y. H. Zhang, H. S. Xu, and G. Q. Xiao
- Published
- 2022
5. Probing Mo93m Isomer Depletion with an Isomer Beam
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S. Guo, B. Ding, X. H. Zhou, Y. B. Wu, J. G. Wang, S. W. Xu, Y. D. Fang, C. M. Petrache, E. A. Lawrie, Y. H. Qiang, Y. Y. Yang, H. J. Ong, J. B. Ma, J. L. Chen, F. Fang, Y. H. Yu, B. F. Lv, F. F. Zeng, Q. B. Zeng, H. Huang, Z. H. Jia, C. X. Jia, W. Liang, Y. Li, N. W. Huang, L. J. Liu, Y. Zheng, W. Q. Zhang, A. Rohilla, Z. Bai, S. L. Jin, K. Wang, F. F. Duan, G. Yang, J. H. Li, J. H. Xu, G. S. Li, M. L. Liu, Z. Liu, Z. G. Gan, M. Wang, and Y. H. Zhang
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General Physics and Astronomy - Published
- 2022
6. Progress of Underground Nuclear Astrophysics Experiment JUNA in China
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W. P. Liu, Z. H. Li, J. J. He, X. D. Tang, G. Lian, J. Su, Y. P. Shen, Z. An, F. Q. Chao, J. J. Chang, L. H. Chen, H. Chen, X. J. Chen, Y. H. Chen, Z. J. Chen, B. Q. Cui, X. C. Du, X. Fang, C. B. Fu, L. Gan, B. Guo, Z. Y. Han, X. Y. Guo, G. Z. He, J. R. He, A. Heger, S. Q. Hou, H. X. Huang, N. Huang, B. L. Jia, L. Y. Jiang, S. Kubono, J. M. Li, M. C. Li, K. A. Li, E. T. Li, T. Li, Y. J. Li, M. Lugaro, X. B. Luo, H. Y. Ma, S. B. Ma, D. M. Mei, W. Nan, W. K. Nan, N. C. Qi, Y. Z. Qian, J. C. Qin, J. Ren, C. S. Shang, L. T. Sun, W. L. Sun, W. P. Tan, I. Tanihata, S. Wang, P. Wang, Y. B. Wang, Q. Wu, S. W. Xu, S. Q. Yan, L. T. Yang, Y. Yang, X. Q. Yu, Q. Yue, S. Zeng, L. Zhang, H. Zhang, H. Y. Zhang, L. Y. Zhang, N. T. Zhang, P. Zhang, Q. W. Zhang, T. Zhang, X. P. Zhang, X. Z. Zhang, W. Zhao, J. F. Zhou, and Y. Zhou
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Atomic and Molecular Physics, and Optics - Published
- 2022
7. Probing ^{93m}Mo Isomer Depletion with an Isomer Beam
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S, Guo, B, Ding, X H, Zhou, Y B, Wu, J G, Wang, S W, Xu, Y D, Fang, C M, Petrache, E A, Lawrie, Y H, Qiang, Y Y, Yang, H J, Ong, J B, Ma, J L, Chen, F, Fang, Y H, Yu, B F, Lv, F F, Zeng, Q B, Zeng, H, Huang, Z H, Jia, C X, Jia, W, Liang, Y, Li, N W, Huang, L J, Liu, Y, Zheng, W Q, Zhang, A, Rohilla, Z, Bai, S L, Jin, K, Wang, F F, Duan, G, Yang, J H, Li, J H, Xu, G S, Li, M L, Liu, Z, Liu, Z G, Gan, M, Wang, and Y H, Zhang
- Abstract
The isomer depletion of ^{93m}Mo was recently reported [Chiara et al., Nature (London) 554, 216 (2018)NATUAS0028-083610.1038/nature25483] as the first direct observation of nuclear excitation by electron capture (NEEC). However, the measured excitation probability of 1.0(3)% is far beyond the theoretical expectation. In order to understand the inconsistency between theory and experiment, we produce the ^{93m}Mo nuclei using the ^{12}C(^{86}Kr,5n) reaction at a beam energy of 559 MeV and transport the reaction residues to a detection station far away from the target area employing a secondary beam line. The isomer depletion is expected to occur during the slowdown process of the ions in the stopping material. In such a low γ-ray background environment, the signature of isomer depletion is not observed, and an upper limit of 2×10^{-5} is estimated for the excitation probability. This is consistent with the theoretical expectation. Our findings shed doubt on the previously reported NEEC phenomenon and highlight the necessity and feasibility of further experimental investigations for reexamining the isomer depletion under low γ-ray background.
- Published
- 2022
8. Roles of circ_0000135/miR-140-3p/PDZK1 network in cervical cancer
- Author
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N, Wang, Y, Zheng, X, Zhang, S W, Xu, X H, Li, Y L, Meng, and J Q, Liu
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MicroRNAs ,Ki-67 Antigen ,Cell Line, Tumor ,Animals ,Humans ,Membrane Proteins ,Uterine Cervical Neoplasms ,Female ,RNA, Circular ,Cell Proliferation - Abstract
To explore the effect of circ_0000135/miR-140-3p/PDZ domain containing 1 (PDZK1) on the occurrence and development of cervical cancer.Clinical data were collected to verify circ_0000135/miR-140-3p/PDZK1 expression in cervical cancer. mRNA expressions of circ_0000135 and miR-140-3p were detected by real-time quantitative PCR. Correlation between circ_0000135 and miR-140-3p/miR-140-3p and PDZK1 was analyzed in vitro. Protein expression detection in cells was conducted by Western blot; while cell proliferation, invasion and cycle distribution by CCK8 assay, Transwell chamber assay and flow cytometry, respectively. Rescue and animal experiment were performed to verify the effect of circ_0000135/miR-140-3p/PDZK1 on cervical cancer.circ_0000135 and PDZK1 expressions were increased, while those of miR-140-3p were decreased in cervical cancer tissues and cells (both P 0.05). sh-circ_0000135 group had decreased cell viability, arrested cells in G0/G1 phase, decreased CyclinD1 expression, inhibited cell migration and invasion; sh-circ_0000135 group showed reduced tumor volume, weight, and lower Ki67 expression (all P 0.05). circ_0000135 had conserved target of miR-140-3p. There was a direct interaction between circ_0000135 and miR-140-3p. miR-140-3p might have direct interaction with PDZK1. sh-circ_0000135 and/or miR-140-3p treatment showed obviously decreased PDZK1 expression, decreased cell activity, arrested cells in G0/G1 phase, downregulated cell migration and invasion; sh-circ_0000135 and/or miR-140-3p mimic treatment showed obviously decreased tumor volume, tumor weight, and Ki67 expression (all P 0.05).circ_0000135 may play an anti-tumor role on the progression of cervical cancer by sponging miR-140-3p to suppress the expression of PDZK1, providing a promising therapeutic target.
- Published
- 2021
9. Observation of He6+t cluster states in Li9
- Author
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Mei-Rong Huang, Y. L. Ye, Shi-Lun Jin, W. L. Zhan, Y. H. Zhang, Z. Z. Ren, Y. S. Song, X. H. Zhou, X. Y. Ju, Wei-Hu Ma, X. Q. Liu, F. F. Duan, J. B. Ma, H. S. Xu, Q. Hu, Z. H. Yang, T. F. Wang, Swagata Mukherjee, J. Lubian, S. Y. Jin, Y. Kanada-En'yo, Z. G. Hu, Y. J. Zhou, R. F. Chen, G. Q. Xiao, J. S. Wang, G. M. Yu, G. Z. Shi, Peng Ma, Youhua Yang, J. Chen, QY Wang, Zhen Bai, J. X. Li, S. W. Xu, Z. H. Gao, and D. Patel
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Physics ,Angular correlation ,Nuclear Theory ,Cluster (physics) ,Magnetic monopole ,GCM transcription factors ,Matrix element ,Born approximation ,Atomic physics ,Nuclear Experiment ,Nucleon ,Excitation - Abstract
$^{6}$He+$t$ cluster states of exited $^{9}$Li have been measured by 32.7 MeV/nucleon $^{9}$Li beams bombarding on $^{208}$Pb target. Two resonant states are clearly observed with the excitation energies at 9.8 MeV and 12.6 MeV and spin-parity of 3/2$^{-}$ and 7/2$^{-}$ respectively. These two states are considered to be members of K$^{\pi}$=1/2$^{-}$ band. The spin-parity of them are identified by the method of angular correlation analysis and verified by the continuum discretized coupled channels (CDCC) calculation, which agrees with the prediction of the generator coordinate method (GCM). A monopole matrix element about 4 fm$^{2}$ for the 3/2$^{-}$ state is extracted from the distorted wave Born approximation (DWBA) calculation. These results strongly support the feature of clustering structure of two neutron-rich clusters in the neutron-rich nucleus $^{9}$Li for the first time.
- Published
- 2021
10. Direct Measurement of the Astrophysical ^{19}F(p,αγ)^{16}O Reaction in the Deepest Operational Underground Laboratory
- Author
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L Y, Zhang, J, Su, J J, He, M, Wiescher, R J, deBoer, D, Kahl, Y J, Chen, X Y, Li, J G, Wang, L, Zhang, F Q, Cao, H, Zhang, Z C, Zhang, T Y, Jiao, Y D, Sheng, L H, Wang, L Y, Song, X Z, Jiang, Z M, Li, E T, Li, S, Wang, G, Lian, Z H, Li, X D, Tang, H W, Zhao, L T, Sun, Q, Wu, J Q, Li, B Q, Cui, L H, Chen, R G, Ma, B, Guo, S W, Xu, J Y, Li, N C, Qi, W L, Sun, X Y, Guo, P, Zhang, Y H, Chen, Y, Zhou, J F, Zhou, J R, He, C S, Shang, M C, Li, X H, Zhou, Y H, Zhang, F S, Zhang, Z G, Hu, H S, Xu, J P, Chen, and W P, Liu
- Abstract
Fluorine is one of the most interesting elements in nuclear astrophysics, where the ^{19}F(p,α)^{16}O reaction is of crucial importance for Galactic ^{19}F abundances and CNO cycle loss in first generation Population III stars. As a day-one campaign at the Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements of the essential ^{19}F(p,αγ)^{16}O reaction channel. The γ-ray yields were measured over E_{c.m.}=72.4-344 keV, covering the Gamow window; our energy of 72.4 keV is unprecedentedly low, reported here for the first time. The experiment was performed under the extremely low cosmic-ray-induced background environment of the China JinPing Underground Laboratory, one of the deepest underground laboratories in the world. The present low-energy S factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced. The thermonuclear ^{19}F(p,αγ)^{16}O reaction rate has been determined directly at the relevant astrophysical energies.
- Published
- 2021
11. Elastic scattering and breakup reactions of the proton drip-line nucleus B 8 on Pb 208 at 238 Me
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K. Wang, Y. Y. Yang, A. M. Moro, V. Guimarães, Jin Lei, D. Y. Pang, F. F. Duan, J. L. Lou, J. C. Zamora, J. S. Wang, Z. Y. Sun, H. J. Ong, X. Liu, S. W. Xu, J. B. Ma, P. Ma, Z. Bai, Q. Hu, X. X. Xu, Z. H. Gao, G. Yang, S. Y. Jin, Y. H. Zhang, X. H. Zhou, Z. G. Hu, H. S. Xu
- Published
- 2021
- Full Text
- View/download PDF
12. Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New ^{22}Mg(α,p)^{25}Al Reaction Rate Determined at the Gamow Energy
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J, Hu, H, Yamaguchi, Y H, Lam, A, Heger, D, Kahl, A M, Jacobs, Z, Johnston, S W, Xu, N T, Zhang, S B, Ma, L H, Ru, E Q, Liu, T, Liu, S, Hayakawa, L, Yang, H, Shimizu, C B, Hamill, A St J, Murphy, J, Su, X, Fang, K Y, Chae, M S, Kwag, S M, Cha, N N, Duy, N K, Uyen, D H, Kim, R G, Pizzone, M, La Cognata, S, Cherubini, S, Romano, A, Tumino, J, Liang, A, Psaltis, M, Sferrazza, D, Kim, Y Y, Li, and S, Kubono
- Abstract
We report the first (in)elastic scattering measurement of ^{25}Al+p with the capability to select and measure in a broad energy range the proton resonances in ^{26}Si contributing to the ^{22}Mg(α,p) reaction at type I x-ray burst energies. We measured spin-parities of four resonances above the α threshold of ^{26}Si that are found to strongly impact the ^{22}Mg(α,p) rate. The new rate advances a state-of-the-art model to remarkably reproduce light curves of the GS 1826-24 clocked burster with mean deviation9% and permits us to discover a strong correlation between the He abundance in the accreting envelope of the photospheric radius expansion burster and the dominance of ^{22}Mg(α,p) branch.
- Published
- 2020
13. [The regulatory effect of GAPLINC in malignant tumors and its relationship with the prognosis of patients]
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Y S, Zhou, S W, Xu, C H, Guan, Z T, Hu, and X M, Jiang
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Neoplasms ,Humans ,RNA, Long Noncoding ,Prognosis - Abstract
长链非编码RNA(long non-coding RNAs, lncRNA)是一类长度超过200个核苷酸且因缺乏开放性阅读框架而丧失蛋白编码能力的转录本,但是lncRNA能够在转录以及转录后等不同水平以诸多方式调控肿瘤的发生发展。GAPLINC(gastric adenocarcinoma associated, positive CD44 regulator, long intergenic non-coding RNA)定位于人类染色体18p11.31,在多种恶性肿瘤(胃癌、结直肠癌、胆管癌等)中异常高表达并能够通过不同的作用机制调控肿瘤细胞的增殖、抗凋亡、侵袭和转移。此外,GAPLINC还可作为生物标志物在肿瘤的早期诊断、靶向治疗及患者的预后评估等方面具有重要的应用前景。该文就GAPLINC在恶性肿瘤中的调控作用及应用前景作一综述。.
- Published
- 2019
14. Dietary taurine supplementation enhances antioxidative capacity and improves breast meat quality of broiler chickens
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Tong Xing, Feng Gao, Jiaolong Li, L. L. Zhang, Bingbing Ma, Y. Jiang, Zhuang Lu, and S W Xu
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Taurine ,Antioxidant ,Meat ,medicine.medical_treatment ,Antioxidants ,Superoxide dismutase ,chemistry.chemical_compound ,medicine ,Animals ,Food science ,Muscle, Skeletal ,biology ,Superoxide ,Broiler ,General Medicine ,Glutathione ,Malondialdehyde ,Animal Feed ,Diet ,chemistry ,Catalase ,Dietary Supplements ,biology.protein ,Animal Science and Zoology ,Chickens ,Food Science - Abstract
1. The aim of this study was to determine the effect of dietary taurine supplementation on growth performance, meat quality and antioxidant responses in breast muscle of broiler chickens.2. A total of 72 Arbor Acres broiler chickens (28-day-old) with similar body weight were randomly allocated into two groups, and fed either 0 g/kg (control; C) or 5 g/kg taurine-supplemented diets (TS) for 14 days.3. The results showed that TS had no effect on growth performance or chemical composition of breast muscle in broilers. The drip and cooking losses were significantly decreased (P < 0.05), and the pH24h of breast muscle were increased (P < 0.05) in the TS group. Meanwhile, broilers in the TS group exhibited significantly higher (P < 0.05) scavenging activities of superoxide and 2,2-diphenyl-1-picrylhydrazyl radicals, and lower (P < 0.05) contents of carbonyl, malondialdehyde, and 4-hydroxynonenal. TS increased (P < 0.05) total antioxidant capacity and superoxide dismutase activities. Moreover, TS significantly upregulated (P < 0.05) the mRNA expressions of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase 1, NAD(P)H quinone dehydrogenase 1, superoxide dismutase, catalase, and glutathione peroxidase.4. These findings suggested that TS enhanced antioxidative capacity and improved breast meat quality of broilers via activating the Nrf2 pathway.
- Published
- 2019
15. Removal of Cr(VI) and phenol coupled with the reduction of sulfate by sulfate-reducing bacteria sludge
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S.-W. Xu, Xu Han, T.-X. Zhou, Y.-F. Wang, Yang Li, and Yong Liu
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Environmental Engineering ,Chemistry ,0208 environmental biotechnology ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Biodegradation ,01 natural sciences ,020801 environmental engineering ,Industrial wastewater treatment ,chemistry.chemical_compound ,Chromium ,Wastewater ,Environmental Chemistry ,Phenol ,Sewage treatment ,Sulfate ,Sulfate-reducing bacteria ,General Agricultural and Biological Sciences ,0105 earth and related environmental sciences ,Nuclear chemistry - Abstract
Biological treatment of industrial wastewater containing heavy metal and organic pollutant has attracted extensive attention. In this study, Cr(VI) reduction coupled with phenol degradation was investigated by the sulfate-reducing bacteria (SRB) sludge with addition of zero-valent iron (ZVI). The results showed that the SRB wet sludge (SWS) had a good bioactivity in the reduction of Cr(VI) only when the initial concentration of Cr(VI) was below 60 mg L−1. The addition of ZVI significantly enhanced the bioactivity and reusability of SWS, and the reduction percentage of Cr(VI) achieved 98% after SWS was successively used for seven cycles. SWS coupled with ZVI showed a high activity in phenol degradation, with more than 94% phenol being degraded in each cycle. However, in the simultaneous removal of Cr(VI) and phenol, phenol degradation was inhibited due to the toxicity of Cr(VI) to phenol degrading microbes in SWS. On the other hand, reduction of sulfate and Cr(VI) was not affected by the presence of phenol, with more than 95% of sulfate and Cr(VI) being removed at the end of the 5th cycle. This study enriches our understanding on the applications of the SRB sludge in the removal of organic and inorganic contaminants in wastewater.
- Published
- 2017
16. [Analysis of genotype and phenotype correlations in a Chinese pedigree with hypertrophic cardiomyopathy]
- Author
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F S, Liu, F, Wang, J, Liu, X B, Xing, S W, Xu, Y Z, Zhu, H M, Zou, W N, Zhao, Z T, Liu, and F F, Sun
- Abstract
肥厚型心肌病是一种常染色体显性遗传性心肌病,本文报道了肥厚型心肌病一家系。该家系先证者同时携带5个罕见变异,分别为TNNI3:p.L144R、MYBPC3:p.S1182R、MYL2:p.E68fs、CTNNA3:p.S760P和DSP:p.I814T。先证者出现心脏性猝死、心室壁变薄等高危临床表型较早,提示肥厚型心肌病具有明显的临床和遗传异质性,复合致病基因变异叠加效应可使临床表型更严重。基因诊断可为肥厚型心肌病的临床诊断、危险分层及心脏性猝死的早期预警提供参考。.
- Published
- 2019
17. Impact of ketamine intervention for acute lung injury on RAGE and TLR9
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W-Z, Han, S-W, Xu, and L, Wang
- Subjects
Lipopolysaccharides ,Male ,Rats, Sprague-Dawley ,Toll-Like Receptor 9 ,Acute Lung Injury ,Receptor for Advanced Glycation End Products ,Leukocytes ,Animals ,Epithelial Cells ,Ketamine ,Bronchoalveolar Lavage Fluid ,Lung ,Rats - Abstract
The purpose of this study was to explore the benefits of ketamine intervention for acute lung injury (ALI) and its effects on the receptor for advanced glycation end-product (RAGE) and toll-like receptor 9 (TLR9).Lipopolysaccharide (LPS, 3 mg/kg) was used to induce ALI rat model. Forty healthy Sprague-Dawley rats (6-8 weeks) were assigned into control, model, low ketamine (5 mg/kg), and high ketamine (50 mg/kg) groups. After 24 h, these rats were sacrificed and lungs were collected.The pathological score, lung W/D ratio, the percentage of leukocytes and epithelial in bronchoalveolar lavage fluids (BALF), the expression levels of RAGE, TLR9, and other inflammation markers in serum and lungs were significantly higher in the Model group, indicating a good ALI model. Ketamine intervention restored all these parameters, with more benefits in the High dose group.The high dose ketamine decreased the degree of ALI by inhibiting the expression of RAGE, TLR9, TNF-α, NF-κB, IL-6 and MPO in tissues.
- Published
- 2018
18. [The safety and effect of transhepatic hilar approach for the treatment of bismuth type Ⅲ and Ⅳ hilar cholangiocarcinoma]
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M, He, H L, Wang, J Y, Yan, S W, Xu, W, Chen, and J, Wang
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Cholangiocarcinoma ,Bile Ducts, Intrahepatic ,Treatment Outcome ,Bile Duct Neoplasms ,Hepatectomy ,Humans ,Prognosis ,Bismuth ,Klatskin Tumor ,Retrospective Studies - Published
- 2018
19. Multi-component Atmosphere Detection Technology Based on Space-Based Filament Laser
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Y. L. Tao, W. Li, W. W. Liu, N. J. Ruan, Z. F. Feng, S. W. Xu, Y. C. Zheng, H. Y. Song, X. Liu, and S. B. Liu
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Materials science ,business.industry ,Laser ,Spectral line ,Pulse (physics) ,law.invention ,Protein filament ,Atmosphere ,Optics ,law ,Ionization ,Femtosecond ,business ,Focus (optics) - Abstract
With the increasing severity of environmental problem, the multi-component atmosphere detection has become the research focus. In this paper, the technology based on space-based filament laser is studied in theory, simulation and experiment. When femtosecond laser pulse propagates in air, the natural direction can be restrained, and the filament laser will be generated due to the nonlinear self-focus effect. The diameter of filament laser is about 100 µm, so the laser intensity is about 1014 W/cm2 inside the filaments laser. When the filament laser interacts with the air, the pollutants are dissociated into small fragments, and the molecules and atoms are ionized. The fluorescent fingerprint spectrum will be emitted according to the special chemical composition, which can be applied in detecting the atmospheric components and identifying the pollutants. The analysis of the pollutant concentration can be performed through direct measurements of the characteristic spectral lines. Relying on the possible generation of filaments at dozens of kilometric distances, this technology can be used in remote analysis of hazardous or unreachable spots, which can carry out the real-time vertical dimensional detection in large scale continuously.
- Published
- 2018
20. Chemical order in GexAsySe1-x-y glasses probed by high resolution X-ray photoelectron spectroscopy.
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S. W. Xu, R. P. Wang, Luther-Davies, B., Kovalskiy, A., Miller, A. C., and Jain, H.
- Subjects
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X-ray photoelectron spectroscopy , *VALENCE bands , *PHOTOELECTRON spectroscopy , *MAGNETIC dipoles , *PHASE separation - Abstract
We have measured high-resolution x-ray photoelectron spectra of GexAsySe1-x-y glasses with a mean coordination number (MCN) from 2.2 to 2.78. The valence band spectra showed that a number of Se-Se-Se trimers can be found in Se-rich samples, whilst multiband features induced by phase separation can be observed in extremely Se-poor samples. When the Ge, As, and Se 3d spectra were decomposed into several doublets, which correspond, respectively, to different chemical environments, the perfect AsSe3/2 pyramidal and GeSe4/2 tetrahedral structures in Se-rich samples gradually evolved into defect structures, including As-As and Ge-Ge homopolar bonds, with increasing Ge and As concentrations. Two transition-like features were found at MCN = 2.5 and 2.64-2.72 that correspond first to the disappearance of Se-chains in the glass network and, subsequently, destruction of the perfect GeSe4/2 tetrahedral structures, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
21. [Effect of sodium thiosulfate on coronary artery calcification in maintenance hemodialysis patients]
- Author
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Y, Yu, Z M, Bi, Y, Wang, Z Q, Chen, and S W, Xu
- Subjects
Inflammation ,Thiosulfates ,Coronary Artery Disease ,Alkaline Phosphatase ,Phosphates ,Fibroblast Growth Factors ,Fibroblast Growth Factor-23 ,C-Reactive Protein ,Bone Density ,Parathyroid Hormone ,Renal Dialysis ,Disease Progression ,Humans ,Calcium ,Tomography, X-Ray Computed ,Vascular Calcification - Published
- 2016
22. A proposed direct measurement of cross section at Gamow window for key reaction 19F(p,α) 16O in Asymptotic Giant Branch stars with a planned accelerator in CJPL
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J. Hu, L. Y. Zhang, S. Q. Hou, J. Su, G. Lian, J. J. He, Shigeru Kubono, B. Guo, N. T. Zhang, T. Zhang, S. Q. Yan, X. P. Zhang, Y. J. Li, Y. P. Shen, C. B. Fu, S. W. Xu, S. B. Ma, W. P. Liu, and B. L. Jia
- Subjects
Nuclear reaction ,Physics ,General Physics and Astronomy ,Window (computing) ,Order (ring theory) ,01 natural sciences ,Nuclear physics ,Cross section (physics) ,Stars ,0103 physical sciences ,Nuclear astrophysics ,Key (cryptography) ,Asymptotic giant branch ,010306 general physics ,Nuclear Experiment ,010303 astronomy & astrophysics - Abstract
In 2014, the National Natural Science Foundation of China (NSFC) approved the Jinping Underground Nuclear Astrophysics laboratory (JUNA) project, which aims at direct cross-section measurements of four key stellar nuclear reactions right down to the Gamow windows. In order to solve the observed fluorine overabundances in Asymptotic Giant Branch (AGB) stars, measuring the key $^{19}$F($p$,$\alpha$)$^{16}$O reaction at effective burning energies (i.e., at Gamow window) is established as one of the scientific research sub-projects. The present paper describes this sub-project in details, including motivation, status, experimental setup, yield and background estimation, aboveground test, as well as other relevant reactions., Comment: 7 pages, 7 figures, 4 tables
- Published
- 2016
23. 2.6 s isomer of 129Nd
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S. -W. Xu, Y. -X. Xie, F. Ma, X. -H. Zhou, Z. -K. Li, Y. Zheng, L. Chen, X. -G. Lei, Y. -H. Zhang, H. L. Lui, and F. R. Xu
- Subjects
Excitation function ,Physics ,Nuclear and High Energy Physics ,Hadron ,Nuclear fusion ,Irradiation ,Atomic physics ,Beam (structure) ,Coincidence ,Transport system ,Decay curve - Abstract
129Nd was produced by irradiation of an enriched target of 96Ru with a 36Ar beam and studied by using a helium-jet fast tape transport system in combination with X- $ \gamma$ and $ \gamma$ - $ \gamma$ coincidence measurements. A 2.6s isomer of 129 Nd was observed for the first time and tentatively proposed to be the configuration of 1/2[411].
- Published
- 2010
24. Impact of Growing-Season Meteorology on Japonica Rice Productivity in Northeastern China
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W. Yu, G. Q. Li, A. G. Ahmed, J. J. Liu, S. W. Xu, Z. M. Li, W. Chen, Y. Wang, Y. E. Zhang, S. S. Seng, L. W. Gao, and J. Y. Zhuang
- Subjects
Agronomy ,Growing season ,Environmental science ,China ,Productivity ,Japonica rice - Published
- 2017
25. Measurement of theFe52mass via the precise proton-decay energy ofCom53
- Author
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Y. P. Shen, W. P. Liu, J. Su, N. T. Zhang, L. Jing, Z. H. Li, Y. B. Wang, B. Guo, S. Q. Yan, Y. J. Li, S. Zeng, G. Lian, X. C. Du, L. Gan, X. X. Bai, J. S. Wang, Y. H. Zhang, X. H. Zhou, X. D. Tang, J. J. He, Y. Y. Yang, S. L. Jin, P. Ma, J. B. Ma, M. R. Huang, Z. Bai, Y. J. Zhou, W. H. Ma, J. Hu, S. W. Xu, S. B. Ma, S. Z. Chen, L. Y. Zhang, and B. Ding
- Subjects
Physics ,Nuclear and High Energy Physics ,Mass excess ,Proton decay ,Atomic physics ,Energy (signal processing) - Abstract
The proton decay of $^{53}\mathrm{Co}^{m}$($3174.1\phantom{\rule{4.pt}{0ex}}\text{keV},19/{2}^{\ensuremath{-}}$) was investigated via the fragmentation of a $^{58}\mathrm{Ni}$ primary beam. The proton-decay energy was determined with an improved precision to be $1558\phantom{\rule{0.16em}{0ex}}(8)\phantom{\rule{4.pt}{0ex}}\text{keV}$. With this new result and the mass of $^{53}\mathrm{Co}^{m}$, the $^{52}\mathrm{Fe}$ mass excess was derived to be $\ensuremath{-}48\phantom{\rule{0.16em}{0ex}}330\phantom{\rule{0.16em}{0ex}}(8)\phantom{\rule{4.pt}{0ex}}\text{keV}$, which is in good agreement with the AME12 value. A new recommended value of $\ensuremath{-}48\phantom{\rule{0.16em}{0ex}}331.6\phantom{\rule{0.16em}{0ex}}(49)\phantom{\rule{4.pt}{0ex}}\text{keV}$ is given.
- Published
- 2015
26. In-situ quasicrystal-reinforced magnesium matrix composite processed by equal channel angular extrusion (ECAE)
- Author
-
Shigeharu Kamado, M. Y. Zheng, S. W. Xu, Yo Kojima, K. Wu, and Xiao Guang Qiao
- Subjects
Materials science ,Equal channel angular extrusion ,Mechanical Engineering ,Metal matrix composite ,Alloy ,Metallurgy ,engineering.material ,Microstructure ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,engineering ,General Materials Science ,Extrusion ,Ceramic ,Ductility ,Eutectic system - Abstract
Magnesium alloys have a strong potential for applications in structural components because of their low density. Considerable effort is currently being devoted to the development of high performance magnesiumbased materials for aerospace and outer space applications. Apart from conventional alloying practice, there has been a rapid development of particle or fiber reinforced magnesium matrix composites [1, 2]. The use of ceramics as reinforcement in magnesium alloys resulted in significant improvement of strength and stiffness. However, such strength and stiffness benefit is at the expense of a rather poor ductility [1, 2]. Quasicrystals are isotropic and possess quasiperiodic lattice structure [3]. Due to the difficulty of the movement of dislocations in the quasicrystals at room and elevated temperatures, quasicrystals exhibit high hardness and high strength [4]. Therefore, quasicrystals have been successfully used as reinforcements in metal-matrix composites [5–7]. For example, quasicrystal-reinforced aluminum matrix composites with high strength combined with good ductility have been developed by powder-metallurgical method [5, 6] and casting process [7]. Recently, it was reported that a thermal stable icosahedral quaiscrystalline phase (I-phase) with chemical composition of Mg3YZn6 was formed as a coarse eutectic structure in the α-Mg matrix during conventional solidification in Mg-Zn-Y alloy system [8]. The existence of the two-phase (I-phase + α-Mg) region in the Mg-Zn-Y alloy system provides an opportunity to develop quasicrystal-reinforced magnesium matrix composites by thermal processing. Conventional thermomechanical processes, such as hot rolling [9, 10] and extrusion [11], have been employed for the alloy system to separate and distribute the I-phase in the α-Mg matrix, thus in-situ I-phase/magnesium matrix composites with high strength and ductility have been achieved [9–11]. Equal channel angular extrusion (ECAE) is a novel metal forming process to produce severe plastic strains in bulk material without changing the cross-section of the material [12]. This procedure has been recognized as one of the most effective methods in producing bulk ultra-fine grained (UFG) materials with
- Published
- 2005
27. Analysis of the Magnetic Properties of RFe11Ti and RFe11TiH (R=Tb,Ho)
- Author
-
H. M. Jin, W. Q. Wang, F. Su, X. F. Wang, Y. Yan, and S. W. Xu
- Subjects
Crystal ,Magnetization ,Materials science ,Condensed matter physics ,Field (physics) ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Crystalline electric field ,Inelastic neutron scattering ,Electronic, Optical and Magnetic Materials ,Magnetization curve - Abstract
The values of crystalline-electric-field parameters A㎚ for RFe₁₁TiHx (R=Tb,Ho) (x=0,1) are obtained by fitting calculations to the magnetization curves along the crystal axes at 4.2 K and higher temperatures. The insertion of H element in RFe₁₁Ti significantly affects CEF parameters A㎚. By using exchange field 2μ_BHex derived by inelastic neutron scattering and fitted A㎚, the calculations reproduce the experimental curves well.
- Published
- 2003
28. 381 2-Hydroxy-4-methylselenobutanoic acid exerted a unique regulation of selenogenome, selenoproteins, and selenocystenine-related genes in tissues of broiler chicks
- Author
-
Lv-Hui Sun, Mickael Briens, Ling Zhao, S. W. Xu, and Xin Gen Lei
- Subjects
Biochemistry ,2-hydroxy-4-methylselenobutanoic acid ,Genetics ,Broiler ,Animal Science and Zoology ,General Medicine ,Biology ,Gene ,Food Science - Published
- 2017
29. Examination of the role of theO14(α,p)F17reaction rate in type-I x-ray bursts
- Author
-
H. Yamaguchi, Jun Young Moon, D. Kahl, Peng-Xiong Ma, K. I. Hahn, D. Irvine, Yusuke Wakabayashi, Shigeru Kubono, T. Hashimoto, S. W. Xu, C. S. Lee, Taro Nakao, J.J. He, J. Su, Anuj Parikh, A. Chen, J. Hu, Hyo Soon Jung, Takashi Teranishi, and H. W. Wang
- Subjects
Nuclear physics ,Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Thermonuclear fusion ,Ion beam ,Orders of magnitude (time) ,Excited state ,Atomic physics ,rp-process ,Nucleon ,7. Clean energy ,Excitation - Abstract
The O-14(alpha, p)F-17 reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type-I x-ray bursts (XRBs). The resonant properties in the compound nucleus Ne-18 have been investigated through resonant elastic scattering of F-17 + p. The radioactive F-17 beam was separated by the Center for Nuclear Study radioactive ion beam separator (CRIB) and bombarded a thick H-2 gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by three Delta E-E silicon telescopes at laboratory angles of theta(lab) approximate to 3 degrees, 10 degrees, and 18 degrees. Five resonances at E-x = 6.15, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions, and their spin-parities have been determined based on an R-matrix analysis. In particular, J(pi) = 1(-) was firmly assigned to the 6.15-MeV state which dominates the thermonuclear O-14(alpha, p)F-17 rate below 2 GK. As well, a possible new excited state in Ne-18 was observed at E-x = 6.85 +/- 0.11 MeV with tentative J = 0 assignment. This state could be the analog state of the 6.880 MeV (0(-)) level in the mirror nucleus O-18, or a bandhead state (0(+)) of the six-particle four-hole (6p-4h) band. A new thermonuclear O-14(alpha, p)F-17 rate has been determined, and the astrophysical impact of multiple recent rates has been examined using an XRB model. Contrary to previous expectations, we find only a modest impact on predicted nuclear energy generation rates from using reaction rates differing by up to several orders of magnitude.
- Published
- 2014
30. Astrophysics studies relevant to stellar x-ray bursts
- Author
-
J. Hu, J. Su, S. Z. Chen, Yasuhiro Togano, Naohito Iwasa, Shigeru Kubono, H. Yamaguchi, Yusuke Wakabayashi, Tomoaki Yamada, J. J. He, S. W. Xu, K. I. Hahn, Tetsuro Komatsubara, Anuj Parikh, Hyo Soon Jung, T. Hashimoto, L. Y. Zhang, D. Kahl, Taro Nakao, Peng-Xiong Ma, A. Chen, C. S. Lee, Wendong Tian, Toshiharu Teranishi, D. Irvine, H. W. Wang, B. Guo, R. F. Chen, S. Hayakawa, and Jun Young Moon
- Subjects
Reaction rate ,Physics ,Elastic scattering ,CNO cycle ,Proton ,Ion beam ,Nuclear astrophysics ,Resonance ,Atomic physics ,Excitation - Abstract
Two reactions of 14O(α,p)17F and 18Ne(α,p)21Na provide the pathways for breakout from the hot CNO cycles to the rp-process in type I X-ray bursts. To better determine their astrophysical reaction rates, resonance parameters of the compound nuclei 18Ne and 22Mg have been investigated by the resonant elastic scattering of 17F+p and 21Na+p, respectively. The 17F and 21Na radioactive ion beams were produced at the CNS Radioactive Ion Beam Separator and impinged on the thick proton targets. The excitation functions were obtained with a thick-target method over a wide excitation energy range. The resonance parameters in the compound nuclei 18Ne and 22Mg have been determined through an R-matrix analysis. New reaction rates of these two (α,p) reactions are recalculated. The astrophysical impact for the 18Ne(α,p)21Na reaction has been investigated through one-zone postprocessing X-ray burst calculations.
- Published
- 2014
31. New β-delayed proton decays in the rare-earth region near the proton drip line
- Author
-
Yuanxiu Ge, Tianmei Zhang, Yong Yu, Y. X. Xie, C. Wang, Q.-Y. Pan, Jianping Xing, Ruichang Ma, S. W. Xu, and Zhankui Li
- Subjects
Nuclear physics ,Proton ,Spins ,General Mathematics ,Rare earth ,Irradiation ,Atomic physics ,Proton emission ,Spectral line ,Coincidence ,Transport system ,Mathematics - Abstract
The β-delayed proton precursors125Nd128Pm129Sm,137Gd and139Dy near the proton drip line were produced by the irradiation of92Mo,96Ru and106Cd with an36Ar beam, and conclusively identified for the first time by using proton-gamma coincidence in combination with a He-jet tape transport system. Their half-lives were determined to be 0.60(15)s,1.0(3)s,O.55(10)s,2.2(2)s and 0.6 (2)s, respectively. The measured energy spectra of β-delayed protons and estimated proton branching ratios to the final states in “daughter” nuclei for the precursors125Nd,129Sm,137Gd and139Dy, as well as the previously reported ones for the precursors135Gd and121Ce, were fitted by a statistical model calculation. The ground-state spins and parities of121Ce,125Nd,129Sm,139Gd,137Gd and139Dy were then assigned as 5/2±,5/2±, 1/2± (or 3/2+), 5/2+,7/2+- and 7/2, respectively. The consistency between the experimental spin-parity assignment and the predicted Nilsson diagrams indirectly indicates that the ground states of121Ce,125Nd,129Sm,135Gd,137Gd and139Dy are highly deformed with β2, - 0.3.
- Published
- 2000
32. β-delayed proton decays of81Zr and85Mo
- Author
-
Xiangfu Sun, Ruichang Ma, Gen-Ming Jin, Yixiao Luo, Wenxue Huang, S. W. Xu, Xiaoji Xu, Y. X. Xie, Zhankui Li, and J. S. Guo
- Subjects
Physics ,Mass excess ,Proton ,Proton decay ,General Mathematics ,Excited state ,Hadron ,Physical chemistry ,Isotopes of zirconium ,Atomic physics ,Nucleon ,Radioactive decay - Abstract
β-delayed proton decays of T z =1/2 series nuclei 81 Zr and 85 Mo have been studied in detail by using p-γ coincidence measurement .The β-delayed proton spectra populating the first excited states of the daughter nuclei have been obtained ,half-life of 81 Zr has been neasured to be 5.3 s±0.5 s and that of 85 Mo 3.2 s±0.2s. By using statistical model calculations and systematic analyses. spins and parities for the ground states of 81 Zr and 85 Mo have been tentatively sssigned to be 3/2 - and 1/2 - , respectively. mass excess of 81 Zr is -58.3 MeV±0.2MeV and that of 85 Mo-59.1MeV +0.4MeV. Combining the measured half-lives with the calculated partial ones yields the branches of β-delayed proton decay for 81 Zr and 85 Mo of (1.2±0.2)×10 -3 and (1.4±0.2)×10 -3 ,respectively.
- Published
- 2000
33. Neaw β-delayed proton precursor121Ce near the proton drip-line
- Author
-
Zhankui Li, S. W. Xu, Yuanxiu Ge, Y. X. Xie, Wenxue Huang, C. Wang, Ruichang Ma, and Tianmei Zhang
- Subjects
Nuclear physics ,Proton ,Proton decay ,Branching fraction ,General Mathematics ,Energy spectrum ,Atomic physics ,Proton emission ,Transport system ,Mathematics ,Line (formation) - Abstract
Unknown β-delayed proton precursor121Ce was produced via the reaction of92Mo(32S, 3n), and identified by an He-jet fast tape transport system with “P-γ” coincidence measurements. The half-life of121Ce decay was determined to be (1.1 ± 0. l)s. Its energy spectrum of β-delayed protons was measured and the β-delayed proton branching ratio for121decay was roughly estimated to be ∼ 1 %. After β-delayed proton decay of the precursors119Ba,121Ba and122La, some of γ-transitions from low-lying states to the ground states in their “daughters” were observed for the first time.
- Published
- 1998
34. The18Ne(α,p)21Na breakout reaction in x-ray bursts: Experimental determination of spin-parities forαresonances in22Mg via resonant elastic scattering of21Na+p
- Author
-
J.J. He, H. Yamaguchi, Shigeru Kubono, S. W. Xu, Takashi Teranishi, H. W. Wang, Wendong Tian, Bao-Hua Sun, Tomoaki Yamada, Bing Guo, Tetsuro Komatsubara, S. Z. Chen, Anuj Parikh, Yasuhiro Togano, D. Kahl, L. Y. Zhang, Naohito Iwasa, Takahiro Hashimoto, Yasuo Wakabayashi, S. Hayakawa, Jiangping Hu, R. F. Chen, and Peng Ma
- Subjects
Physics ,Excitation function ,Reaction rate ,Elastic scattering ,Nuclear and High Energy Physics ,Ion beam ,Scattering ,X-ray ,Resonance ,Atomic physics ,rp-process ,Nuclear Experiment - Abstract
The 18Ne(alpha, p)Na-21 reaction provides a pathway for breakout from the hot CNO cycles to the rp process in type-l x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus Mg-22 have been investigated by measuring the resonant elastic scattering of Na-21 + p. An 89 MeV Na-21 radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm(2) thick polyethylene target. The recoiled protons were measured at scattering angles of theta(c.m.) approximate to 175 degrees and 152 degrees by three Delta E-E silicon telescopes. The excitation function was obtained with a thick-target method over energies Ex (Mg-22) = 5.5-9.2 MeV. The resonance parameters have been determined through an R-matrix analysis. For the first time, the J(pi) values for ten states above the a threshold in Mg-22 have been experimentally determined in a single consistent measurement. We have made three new J(pi) assignments and confirmed seven of the ten tentative assignments in the previous work. The Ne-18(alpha, p)Na-21 reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the Ne-18(alpha, p)Na-21 rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena.
- Published
- 2013
35. Publisher's Note: Elastic scattering of the proton drip-line nucleus8B off anatPb target at 170.3 MeV [Phys. Rev. C87, 044613 (2013)]
- Author
-
R. Wada, S. W. Xu, S. Z. Chen, X. H. Yuan, X. Y. Zhang, Y. Li, L. Jin, Q. Y. Lin, Yi Zhang, Jifeng Hu, F. Fu, G. F. Xu, Xiang Zhang, Wei Zhang, S. Jin, Lin Zhang, X. Xu, Haoxing Xu, Mei-Rong Huang, X. G. Lei, P. Ma, S. L. Li, Z. Q. Chen, X. G. Cao, Q. Wang, S. W. Tang, G. Q. Xiao, C. M. Du, C. Zhen, Z. G. Hu, J. L. Han, Z. Y. Sun, Z. Y. Guo, B. X. Gou, R. F. Chen, N. Keeley, Zhong Chen, J. J. He, F. D. Shi, L. M. Duan, Swagata Mukherjee, Y. Y. Yang, Q. Hu, Z. G. Xu, Minggang Zhao, J. S. Wang, Dan-Yang Pang, J. B. Chen, K. Rusek, L. X. Liu, Z. Bai, and J. B. Ma
- Subjects
Physics ,Elastic scattering ,Nuclear physics ,Nuclear and High Energy Physics ,medicine.anatomical_structure ,Proton ,Nat ,medicine ,Nucleus ,Line (formation) - Published
- 2013
36. Elastic scattering of the proton drip-line nucleus8B off anatPb target at 170.3 MeV
- Author
-
L. M. Duan, Swagata Mukherjee, Mei-Rong Huang, J. B. Ma, Q. Hu, Z. Bai, N. Keeley, Zhong Chen, G. Q. Xiao, Q. Wang, C. Zhen, Minggang Zhao, Z. Y. Sun, S. W. Tang, Z. Y. Guo, R. Wada, J. L. Han, G. F. Xu, B. X. Gou, S. Jin, F. D. Shi, Yi Zhang, Y. Li, J. J. He, X. Xu, C. M. Du, X. H. Yuan, X. Y. Zhang, Haoxing Xu, X. G. Cao, Q. Y. Lin, Z. G. Hu, Xiang Zhang, J. S. Wang, S. L. Li, Z. G. Xu, Jifeng Hu, Z. Q. Chen, S. Z. Chen, R. F. Chen, J. B. Chen, K. Rusek, L. X. Liu, X. G. Lei, F. Fu, Y. Y. Yang, Wei Zhang, S. W. Xu, Lin Zhang, P. Ma, Dan-Yang Pang, and L. Jin
- Subjects
Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Discretization ,Scattering ,Coulomb barrier ,Small-angle neutron scattering ,medicine.anatomical_structure ,medicine ,Neutron ,Halo ,Atomic physics ,Nuclear Experiment ,Nucleus - Abstract
The elastic scattering of ${}^{8}$B by a ${}^{\mathrm{nat}}$Pb target was measured at an incident energy of 170.3 MeV. Special care was taken with the limited intensity and broad profile of the secondary beam. The measured angular distribution of the differential cross section shows that the Coulomb-nuclear interference peak (CNIP) is not suppressed in this system, in contrast to what was observed in the scattering of neutron halo nuclei by heavy targets at energies around the Coulomb barrier. Analyses of the angular distribution were performed both in terms of the optical model using a single-folding-type potential and the continuum discretized coupled-channels (CDCC) method, which explicitly takes into account the breakup-channel couplings to the elastic scattering. The overall pattern of the differential cross section is well reproduced by the CDCC calculations. The calculations show that the effect of breakup-channel couplings on the elastic scattering is small in the present case.
- Published
- 2013
37. Reexamining theβdecay of53,54Ni,52,53Co,51Fe, and50Mn
- Author
-
J. B. Ma, F. D. Shi, Y. S. Chen, J. S. Wang, N. C. Shu, B. Guo, M. S. Smith, S. W. Xu, L. X. Liu, Z. Chen, Q. Y. Lin, X. Q. Li, W. Z. Huang, S. Q. Yan, G. Lian, W. P. Liu, S. Z. Chen, S. B. Ma, Z. Bai, Q. Hu, Y. J. Li, S. J. Jin, J. Su, P. Ma, Y. Y. Yang, X. H. Zhang, S. Zeng, W. J. Zhang, R. F. Chen, J. J. He, X. S. Yan, J. L. Han, S. L. Jin, Zhihong Li, F. Fu, X. X. Bai, E. T. Li, Y. B. Wang, J. Hu, C. He, X. G. Cao, K. Yang, and X. Liu
- Subjects
Physics ,Nuclear and High Energy Physics ,Nuclear Theory ,Beta decay ,Coincidence ,Nuclear physics ,Fragmentation (mass spectrometry) ,Nucleosynthesis ,Double beta decay ,Physics::Accelerator Physics ,Isobaric process ,Atomic physics ,Proton emission ,Nuclear Experiment ,Excitation - Abstract
he decay of 53,54Ni, 52,53Co, 51Fe, and 50Mn was investigated via the fragmentation of a 58Ni primary beam with an energy of 68.6 MeV/u. The proton- coincidences of 53Ni -delayed proton emission were observed. Based on the analysis of the proton- coincidence events, it was inferred that the previous assignment of the excitation energy for the isobaric analog state in 53Co may be problematic. The half-lives of these nuclei were obtained, in which the uncertainty of 52Co half-life was reduced by a factor of 3. The half-lives were evaluated and used as inputs of nucleosynthesis calculations of the rapid proton-capture process in an x-ray burst.
- Published
- 2013
38. Determination of the astrophysical12N(p,γ)13O reaction rate from the2H(12N,13O)nreaction and its astrophysical implications
- Author
-
B. Guo, J. Su, Z. H. Li, Y. B. Wang, S. Q. Yan, Y. J. Li, N. C. Shu, Y. L. Han, X. X. Bai, Y. S. Chen, W. P. Liu, H. Yamaguchi, D. N. Binh, T. Hashimoto, S. Hayakawa, D. Kahl, S. Kubono, J. J. He, J. Hu, S. W. Xu, N. Iwasa, and N. Kume
- Subjects
Physics ,Reaction rate ,Nuclear and High Energy Physics ,Direct component ,Proton ,Excited state ,Zero-point energy ,Atomic physics ,Ground state ,Square (algebra) ,Order of magnitude - Abstract
The evolution of massive stars with very low-metallicities depends critically on the amount of CNO nuclides which they produce. The ${}^{12}$N($p,\ensuremath{\gamma}$)${}^{13}$O reaction is an important branching point in the rap processes, which are believed to be alternative paths to the slow $3\ensuremath{\alpha}$ process for producing CNO seed nuclei and thus could change the fate of massive stars. In the present work, the angular distribution of the ${}^{2}$H(${}^{12}$N, ${}^{13}$O)$n$ proton transfer reaction at ${E}_{\mathrm{c}.\mathrm{m}.}=8.4$ MeV has been measured for the first time. Based on the Johnson-Soper approach, the square of the asymptotic normalization coefficient (ANC) for the virtual decay of ${}^{13}$O${}_{\mathrm{g}}.\mathrm{s}.$ $\ensuremath{\rightarrow}$ ${}^{12}$N+$p$ was extracted to be $3.92\ifmmode\pm\else\textpm\fi{}1.47$ fm${}^{\ensuremath{-}1}$ from the measured angular distribution and utilized to compute the direct component in the ${}^{12}$N($p,\ensuremath{\gamma}$)${}^{13}$O reaction. The direct astrophysical $S$ factor at zero energy was then found to be $0.39\ifmmode\pm\else\textpm\fi{}0.15$ keV b. By considering the direct capture into the ground state of ${}^{13}$O, the resonant capture via the first excited state of ${}^{13}$O and their interference, we determined the total astrophysical $S$ factors and rates of the ${}^{12}$N($p,\ensuremath{\gamma}$)${}^{13}$O reaction. The new rate is two orders of magnitude slower than that from the REACLIB compilation. Our reaction network calculations with the present rate imply that ${}^{12}$N($p,\ensuremath{\gamma}$)${}^{13}$O will only compete successfully with the ${\ensuremath{\beta}}^{+}$ decay of ${}^{12}$N at higher ($\ensuremath{\sim}2$ orders of magnitude) densities than initially predicted.
- Published
- 2013
39. (EC +β +) decay of130Ce
- Author
-
Ruichang Ma, S.F. Zhu, Yuanxiu Ge, B. Guo, S. W. Xu, Jinzhou Du, Wang Xu, Yingxiang Guo, Tianmei Zhang, C. Wang, Zhankui Li, Tianrui Guo, Jianping Xing, and Y. X. Xie
- Subjects
Physics ,Nuclear and High Energy Physics ,Decay scheme ,chemistry.chemical_element ,Sample (graphics) ,Coincidence ,law.invention ,Cerium ,chemistry ,law ,Shielded cable ,Nuclear fusion ,Atomic physics ,Transport system - Abstract
The nuclide130Ce was produced by a (16O, 4n) reaction on an enriched118Sn target. Reaction products were transported to a shielded location by using a heliumjet tape transport system. A 22.9 min activity in chemically separated cerium sample was identified as130Ce. The (EC+β +) decay scheme of130Ce was proposed for the first time. This scheme includes 108γ-lines, 107γ-lines among them being new. More than 13 1+ low-lying states of130La are populated in the decay of130Ce. Two new isomers with half-life of 77±10 ns and 17±5 ns were observed by means of delayedγ-γ coincidence measurements.
- Published
- 1996
40. Low lying states inHo153andTm157from electron capture andβ+decay ofEr153andYb157
- Author
-
Jinnan Gu, Y. X. Xie, Yihao Wang, Xueqian Zhang, Juping Zhang, Yuanxiu Ge, Q.-Y. Pan, Yixiao Luo, Changhua Zhang, Xingqu Chen, S. W. Xu, C. Wang, Xijin Yin, and Zheng Xing
- Subjects
Quenching ,Physics ,Nuclear and High Energy Physics ,Electron capture ,SHELL model ,Neutron ,State (functional analysis) ,Atomic physics ,Ground state ,Beta decay ,Quasi particles - Abstract
A detailed discussion and supplemental experimental information on the electron capture and ${\mathrm{\ensuremath{\beta}}}^{+}$ decay schemes of $^{153}\mathrm{Er}$ and $^{157}\mathrm{Yb}$ proposed in our previous publications are included. The three-quasiparticle state and single-proton states assigned to $^{153}\mathrm{Ho}$ have been reproduced by a shell model calculation. The extracted quenching factor for the three-quasiparticle state was determined to be 10. The existence of the two bands in $^{157}\mathrm{Tm}$ has been explained by a triaxial deformation of the ground state of this nucleus. The experimental evidence from systematic behavior of the compiled low-energy levels indicates that the ground-state shapes change from spherical to deformed between neutron numbers N=86 and 88 in both the odd Ho and odd Tm isotopic chains. \textcopyright{} 1996 The American Physical Society.
- Published
- 1996
41. Structural Optimization of Thermomechanical Properties for Short-Fiber-Reinforced Composites
- Author
-
D. C. Stouffer and S. W. Xu
- Subjects
Materials science ,Composite number ,Stiffness ,02 engineering and technology ,Fiber-reinforced composite ,Geometric shape ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Finite element method ,Stress (mechanics) ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Volume fraction ,Ceramics and Composites ,medicine ,Fiber ,Composite material ,medicine.symptom ,0210 nano-technology - Abstract
Composite materials are heterogeneous materials on the microscopic level. For short-fiber reinforced composites, the fiber-matrix and fiber-fiber interactions play a significant role in the strength and global stiffness of the material. A unit cell model is developed to study the influence of fiber clustering patterns on the local stress distribution and global composite properties. Design variables are established to account for the variations in fiber clustering patterns, aspect ratio, volume fraction, and fiber packing. Design constraints are used to represent composite moduli, thermal coefficients of expansion, maximum interfacial stress and thermal residual stress. The model is analyzed by the p-version finite element method. The study is limited to elastic analysis. The p-version finite element method offers rapid convergence on localized stress fields using only coarse mesh and allows geometric shape variations without remeshing. Solution accuracy can be checked systematically using a series of solutions with increasing numerical complexity that is generated from a given mesh. A parametric study of the effect of fiber cluster patterns, fiber packing, and fiber aspect ratio is conducted. The study shows that the fiber cluster pattern and fiber packing has a significant impact on all of the composite properties studied.
- Published
- 1995
42. Study of resonant scattering of [sup 21]Na+p relevant to astrophysical [sup 18]Ne(α,p)[sup 21]Na reaction
- Author
-
Tetsuro Komatsubara, H. Yamaguchi, Tomoaki Yamada, N. Iwasa, J. Hu, Shigeru Kubono, D. Kahl, J. J. He, T. Teranishi, Yasuhiro Togano, S. Hayakawa, S. Z. Chen, Takahiro Hashimoto, Yasuo Wakabayashi, Peng-Xiong Ma, L. Y. Zhang, S. W. Xu, Wendong Tian, H. W. Wang, B. Guo, and R. F. Chen
- Subjects
Physics ,Reaction rate ,Elastic scattering ,Cross section (physics) ,Ion beam ,Nucleosynthesis ,Nuclear astrophysics ,Atomic physics ,Resonant scattering ,Excitation - Abstract
Astrophysical 18Ne(α,p)21Na reaction is one of the most probable breakout routes, which lead to the rp-process from the hot-CNO cycle, converting the initial CNO elements into heavier elements in Type I x-ray bursters. Presently, there is no much experimental cross-section data reported at the energy of astrophysical interest, and resonant spectroscopic information in compound 22Mg is scarce as well. The experiment has been carried out by using the CNS radioactive ion beam separator (CRIB). Resonant properties in 22Mg have been studied via the resonant elastic scattering of 21Na+p, and cross section of the time-reversal reaction of 21Na(p,α)18Ne been measured simultaneously. A wide excitation energy region up to Ex ∼ 9.5 MeV in 22Mg has been scanned with a thick-target method. Some preliminary results will be reported.
- Published
- 2012
43. Effects of Zearalenone on IL-2, IL-6, and IFN-γ mRNA Levels in the Splenic Lymphocytes of Chickens
- Author
-
Junliang Deng, Z. H. Ren, S. W. Xu, Wang Yingzhu, X. Peng, H. M. Cui, Z. C. Zuo, and Y. Wang
- Subjects
Interleukin 2 ,medicine.medical_specialty ,Article Subject ,lcsh:Medicine ,medicine.disease_cause ,Models, Biological ,lcsh:Technology ,General Biochemistry, Genetics and Molecular Biology ,Interferon-gamma ,chemistry.chemical_compound ,Immune system ,Internal medicine ,medicine ,Animals ,Interferon gamma ,Estrogens, Non-Steroidal ,Lymphocytes ,RNA, Messenger ,Mycotoxin ,Interleukin 6 ,lcsh:Science ,Zearalenone ,General Environmental Science ,biology ,Interleukin-6 ,Toxin ,lcsh:T ,fungi ,lcsh:R ,General Medicine ,In vitro ,Endocrinology ,Gene Expression Regulation ,chemistry ,Immune System ,biology.protein ,Interleukin-2 ,lcsh:Q ,Chickens ,Research Article ,medicine.drug - Abstract
Zearalenone (ZEN) is an estrogenic mycotoxin produced by severalFusariumspecies, which can contaminate food and feed. These compounds elicit a wide spectrum of toxic effects, including the capacity to alter normal immune function. In this study, the in vitro effects of the treatment of ConA-stimulated splenic lymphocytes with ZEN (0–25 μg/mL) were examined. ZEN modulates the expression of IL-2, IL-6, and IFN-γ. The IL-2 levels were up to fourfold higher (P<0.05) compared with the levels in the control at toxin concentrations of 25 μg/mL after 48 h of treatment. The IL-6 levels were critically suppressed at this concentration; these changes were very statistically significant (P<0.05). At lower ZEN concentrations (0.1, 0.4 and 1.6 μg/mL), the IFN-γlevels changed slightly; however at 6.25 and 25 μg/mL, the IFN-γresults reached statistical significance compared with the control levels (P<0.05). These data suggest that ZEN has potent effects on the expression of chicken splenic lymphocytes cytokines at the mRNA level.
- Published
- 2012
44. Investigation of the [sup 14]O(α,p)[sup 17]F stellar reaction via resonant elastic scattering of [sup 17]F+p
- Author
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S. W. Xu, P. Ma, L. X. Liu, X. H. Zhang, S. T. Wang, J. J. He, J. S. Wang, Y. D. Zang, Y. H. Zhang, R. P. Ye, S. W. Tang, X. Q. Li, Y. Y. Yang, W. D. Tian, J. B. Ma, X. Xu, X. Y. Zhang, H. W. Wang, X. H. Yuan, H. S. Xu, Z. Q. Chen, X. Q. Yu, J. Hu, X. G. Lei, S. L. Jin, Z. Y. Guo, J. D. Chen, J. Su, Z. G. Hu, E. T. Li, Z. Bai, L. Li, L. Y. Zhang, Z. Y. Sun, X. H. Zhou, C. M. Du, Y. H. Yu, and W. Lu
- Subjects
Excitation function ,Physics ,Elastic scattering ,Silicon ,Ion beam ,chemistry.chemical_element ,law.invention ,Telescope ,chemistry ,law ,Atomic physics ,Nuclear Experiment ,Beam (structure) ,Line (formation) - Abstract
Resonant properties in 18Ne relevant to the stellar reaction of 14O(α,p)17F have been investigated through a resonant elastic scattering of 17F+p. The 17F RI beam was produced via a projectile-fragmentation reaction, and subsequently separated and purified by a Radioactive Ion beam Line in Lanzhou (RIBLL). After a series of energy degradation, a 4.21 AMeV 17F beam bombarded a thick (CH2)n target at T2 terminal. Energy and angle of the recoiled protons were measured by two sets of ΔE-E silicon telescope at θlab ≈ 0°, 14° respectively. Several resonances in 18Ne were observed, and their resonant parameters including energy, spin-parity and decay width have been determined by an R-Matrix analysis of the experimental excitation function.
- Published
- 2012
45. Decay studies of [sup 145,147]Er, [sup 146]Ho and [sup 129]Nd
- Author
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F. Ma, S. W. Xu, X. H. Zhou, Y. X. Xie, Y. Zheng, and Bertram Blank
- Subjects
Nuclear physics ,Isotope ,Chemistry ,Radiochemistry ,Transport system ,Radioactive decay - Abstract
Based on a He‐jet apparatus coupled with a tape transport system, Very neutron‐deficient isotopes 145,147Er, 146Ho, and 129Nd were identified by p‐γ(X) or γ‐γ(X) coincidence measurements, and their radioactive decay properties were studied.
- Published
- 2011
46. One-step Synthesis of Mesoporous Sulfated Zirconia Nanoparticles with Anion Template
- Author
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L. Y. Zhang, H. Wang, S. W. Xu, C. Y. Han, Y. Y. Zhang, D. Q. Du, J. Y. Li, and Y. M. Luo
- Published
- 2011
47. Experimental Investigations of Free-To-Roll Motions Induced by Wings and Forebody Complex Flow Under Pitch-Up Motions
- Author
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T. A. Khan, X. Y. Deng, Y. K. Wang, S. W. Xu, Jiachun Li, and Song Fu
- Subjects
Physics::Fluid Dynamics ,Pitch-up ,Physics ,symbols.namesake ,Amplitude ,Wing ,Wing rock ,Angle of attack ,Flow (psychology) ,symbols ,Reynolds number ,Mechanics ,Vortex - Abstract
Experiments have been carried out at sub‐critical Reynolds number to investigate wing rock induced by forebody and/or wings complex flow on a 30° swept back non‐slender wings‐slender body‐model for static and dynamic (pitch‐up) cases. Four angle of attack regions have been identified based on the characteristics of FTR motion and associated flow structures at static angles of attack. For the dynamic (pitch‐up) case it has been observed that roll amplitude decreases and lag increases with increase in pitching speed. Decrease in roll amplitude with increase in pitch rate is attributed to low disturbing rolling moment due to weaker interaction between forebody and wing flow components. Forebody asymmetric vortices dominate and control the roll motion of the model in dynamic case when non‐dimensional pitch rate ≥1 × 10−2 and the roll behavior is like a sinusoidal curve. There is almost no contribution to the roll motion from the wings flow at lower angles of attack for high pitch rates.
- Published
- 2011
48. A Facile Route for Rapid Synthesis of Mesoporous SBA-16 Silica
- Author
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D. Q. Du, L. Y. Zhang, Y. Y. Zhang, C. Y. Han, Y. M. Luo, H. P. Pu, H. Wang, and S. W. Xu
- Subjects
Materials science ,Inorganic chemistry ,Nucleation ,Degree of polymerization ,Mesoporous silica ,Hydrothermal circulation ,law.invention ,chemistry.chemical_compound ,Silanol ,chemistry ,Chemical engineering ,law ,Phosphomolybdic acid ,Crystallization ,Mesoporous material - Abstract
SBA-16-type mesoporous silica materials have been synthesized within 6h under weak acidic media by adding small amount of phosphomolybdic acid and inorganic salts. The reaction products have still maintained a well-ordered body-centered cubic (Im3m) mesostructure even after treated with 100 °C water for 120 h. High hydrothermal stability might be attributed to the higher degree of polymerization and condensation of silanol groups, originated from the synergistic effect of rapid nucleation with the aid of HPMo and salt effect during the crystallization process.
- Published
- 2011
49. Measurement of milk D-3-hydroxybutyrate with a simple UV spectrophotometer method: an alternative assay method
- Author
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Z G, Zhang, G W, Liu, X B, Li, Y F, Li, C M, Guo, L, Gao, H B, Wang, S W, Xu, and Z, Wang
- Subjects
Milk ,3-Hydroxybutyric Acid ,Animals ,Cattle ,Female ,Spectrophotometry, Ultraviolet ,Sensitivity and Specificity - Abstract
The measurement of D-3-hydroxybutyrate (D-BHBA) in milk samples is an important tool for diagnosis of subclinical/clinical ketosis in dairy cows. We describe a simple UV spectrophotometric method for measuring the concentration of D-BHBA in milk of dairy cows. From two herds, 119 milk samples were taken from dairy cows. The standard-curve equation was y = 0.2582x + 0.0269 (R2 = 0.9967). The assay was highly specific with a minimum detection limit of 0.01 mmol/L and measuring range of up to 5 mmol/L. The recovery was between 99.35% and 100.22% and repeatability was 99.8%. The comparison between the spectrophotometric method and the fluorometric method revealed a close correlation (r = 0.9939). These results show that the spectrophotometric method can be successfully used as an alternative method to measure D-BHBA content in milk.
- Published
- 2010
50. Analysis of risk factors associated with outcomes in road traffic injury patients with acute lung injury
- Author
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J-X Gan, Ming Zhang, Jack S. Wu, Guan-yu Jiang, S-W Xu, and Lei Sheng
- Subjects
Male ,medicine.medical_specialty ,Acute Lung Injury ,Poison control ,Lung injury ,Biochemistry ,Suicide prevention ,Occupational safety and health ,Sepsis ,Patient Admission ,Risk Factors ,Injury prevention ,Odds Ratio ,Medicine ,Humans ,Intensive care medicine ,business.industry ,Biochemistry (medical) ,Accidents, Traffic ,Human factors and ergonomics ,Cell Biology ,General Medicine ,respiratory system ,medicine.disease ,respiratory tract diseases ,Treatment Outcome ,Female ,business ,Risk assessment ,human activities - Abstract
Over 50% of road traffic injury (RTI) patients experience post-traumatic acute lung injury (ALI) and it is, therefore, extremely important to identify the risk factors related to the poor outcomes associated with ALI in RTI populations. This study evaluated 19 potential risk factors associated with the outcomes of ALI in 366 RTI patients. They were divided into two groups: a ‘favourable outcomes group’ and an ‘unfavourable outcomes group’. The results indicated that the Acute Physiology and Chronic Health Evaluation II (APACHE II) score and the presence of gastrointestinal haemorrhage may help predict the outcomes of ALI in the early post-trauma phase of treatment. The duration of trauma and sepsis were shown to impact strongly on both the short- and long-term outcomes of ALI. Age (≥ 65 years) and disseminated intravascular coagulation in the early RTI phase were also independent risk factors for a poorer short- and long-term outcome in ALI.
- Published
- 2009
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