11 results on '"Li, Jin-Liang"'
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2. Method of pre-oxidation treatment for spontaneous combustion inhibition and its application.
- Author
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Li, Jin-liang, Lu, Wei, Cao, Ying-jiazi, Kong, Biao, and Zhang, Qing-song
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SPONTANEOUS combustion , *COAL combustion , *FUNCTIONAL groups , *AQUEOUS solutions , *INHIBITION (Chemistry) - Abstract
A method named "pre-oxidation treatment for spontaneous combustion inhibition" was proposed to proactively prevent coal spontaneous combustion. In this method, coal samples are firstly oxidized under room temperature by an oxidizer, which have an oxidizing capacity equivalent to the capability of oxidizing only active functional groups in coal. In this way, functional groups residing in the coal structure with high reactivity will be oxidized and heat will be released at the same time. With a large amount of water protection set up in advance, the heat can be released safely. After the highly active functional groups are oxidized, the reaction products left contain more stable functional groups with low activity, thus reducing the risks of spontaneous combustion. Underpinned by the theory, the method was tested by using different aqueous solutions of oxidants to pre-oxidize various coal samples. Results show that the method of pre-oxidation treatment for spontaneous combustion inhibition can significantly reduce th e risk of coal spontaneous combustion. Among all the tested aqueous solutions of oxidants, the sodium persulfate solution is the most appropriate one. [ABSTRACT FROM AUTHOR]
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- 2019
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3. Thermodynamics of oxygen-containing intermediates and their role in coal spontaneous combustion.
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Li, Jin-liang, Lu, Wei, Li, Jin-hu, Zhang, Qinsong, and Zhuo, Hui
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SPONTANEOUS combustion , *THERMODYNAMIC laws , *THERMODYNAMICS , *ACTIVATION energy , *COAL combustion , *SECOND law of thermodynamics - Abstract
Oxygen-containing intermediates (OCIs) play an important role in low-temperature oxidation of coal. However, since they are in a dynamic intermediate state, it is difficult to test their thermodynamic properties, and their mechanism of action in coal spontaneous combustion(CSC) are not clear. Therefore, this paper proposed a method to measure the thermodynamics of the OCIs. Furthermore, the reasons for the variation laws of the thermodynamics of the OCIs and their mechanisms of action in CSC were investigated from both macro and micro perspectives. According to the experimental results, thermodynamic parameters of the OCIs can be obtained using the proposed method. And the heating rate of OCIs calculated by the mathematical model based on this method is closer to the total rate of coal oxidation before 70 °C, indicating that OCIs play an important role in the starting process of CSC. Besides, the activation energy of OCIs presents different variation characteristics in different stages. The segmentation can be attributed to the stability of OCIs, which is also critical to the prevention and control of CSC. Hence, the risk of CSC can be reduced by improving the stability of OCIs. • A method to quantitatively calculate the thermodynamic parameters of oxygen-containing intermediates (OCIs) was established. • From the point of view of heat, OCIs play an important role in the starting process of coal spontaneous combustion (CSC). • The activation energy of OCIs has obvious segmentation. • The cumulative production and decomposition threshold of peroxide are the key factors affecting CSC. [ABSTRACT FROM AUTHOR]
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- 2022
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4. Copper(II)-containing C2-symmetric bistetracarboline amides in enantioselective Henry reactions.
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Li, Jin-Liang, Liu, Li, Pei, Yu-Ning, and Zhu, Hua-Jie
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COPPER ions , *SYMMETRY (Physics) , *CARBOLINES , *AMIDES , *ENANTIOSELECTIVE catalysis , *NITROALDOL reactions - Abstract
A series of new C 2 -symmetric chiral diamides were synthesized from l -tryptophan and used as chiral ligands chelated with Cu(II) in enantioselective Henry reactions. Ligand 4a with CuCl 2 ·2H 2 O (5%) showed effective catalytic efficiency in Henry reaction. High yields (up to 99%) and excellent enantioselectivities (up to 98%) were achieved for both aromatic and aliphatic aldehyde substrates. [ABSTRACT FROM AUTHOR]
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- 2014
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5. The effects of biofeedback training of pelvic floor muscles on fecal incontinence.
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Sun, Xiao-bing, Zhang, Li, Li, Yan-hua, Li, Jin-liang, and Chen, Yu-li
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BIOFEEDBACK training ,PELVIC floor ,MUSCLES ,FECAL incontinence in children ,HIRSCHSPRUNG'S disease ,ANUS ,MANOMETERS ,RETROSPECTIVE studies - Abstract
Abstract: Objective: The purpose of this study is to discuss the effect of pelvic floor muscle training on fecal incontinence. Methods: A retrospective study was performed on patients who received pelvic floor muscle training from March 2002 to April 2007. There were 55 patients with fecal incontinence (male, 32 cases; female, 23 cases; mean age, 9.4 years old from 6 to 14), including 39 cases of anorectal malformation and 16 cases of Hirschsprung''s disease. Pelvic floor muscle training was performed using biofeedback for 2 weeks in hospital, 2 times each day, and 30 minutes each time. The patients were then instructed to carry out self-training at home without the biofeedback device daily and received training evaluations in the hospital outpatient department monthly. All patients completed the training regimen and were followed up for 1 year. Anal manometry and clinical score were evaluated before and after training. Results: Anal continence of 30 patients had satisfactory improvement, but not for the other 25 cases after training. The mean anal squeeze pressures of the group that had good results and the group that had poor results were 98.4 ± 7.3 and 47.4 ± 13.6 mm Hg, respectively, before training. There were 31 patients whose anal squeeze pressures were above 80 mm Hg, and 26 of these had satisfactory anal continence improvement, including all patients with Hirschsprung''s disease. On the contrary, only 4 of 24 cases whose anal squeeze pressure was below 80 mm Hg acquired satisfactory anal continence improvement. Conclusions: Pelvic floor muscle training could achieve good results in some patients with fecal incontinence. Baseline measurements during anorectal manometry appear to provide good prediction of prognosis and effective management. [Copyright &y& Elsevier]
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- 2009
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6. Acaricidal activity of four fractions and octadecanoic acid-tetrahydrofuran-3,4-diyl ester isolated from chloroform extracts of neem (Azadirachta indica) oil against Sarcoptes scabiei var. cuniculi larvae in vitro
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Du, Yong-Hua, Li, Jin-Liang, Jia, Ren-Yong, Yin, Zhong-Qiong, Li, Xu-Ting, Lv, Cheng, Ye, Gang, Zhang, Li, and Zhang, Yu-Qun
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ACARICIDES , *SARCOPTES scabiei , *NEEM oil , *TETRAHYDROFURAN , *CHROMATOGRAPHIC analysis - Abstract
Abstract: Four fractions obtained from chloroform extracts of neem (Azadirachta indica) oil by column chromatography were investigated for acaricidal activity against Sarcoptes scabiei var. cuniculi larvae in vitro. Octadecanoic acid-tetrahydrofuran-3,4-diyl ester was isolated from an active fraction of the chloroform extract and its toxicity against S. scabiei larvae was tested in vitro. A complementary log–log model was used to analyse the toxicity data. Activity was found in the third fraction, with 100% corrected mortality after 4.5h of exposure at a concentration of 200mgml−1. This fraction was repeatedly re-crystallised in acetone to yield a white amorphous powder, identified as octadecanoic acid-tetrahydrofuran-3,4-diyl ester, with a median lethal concentration (LC50) of 0.1mgml−1 at 24h post-treatment. The median lethal time (LT50) for this compound was 15.3h at a concentration of 7.5mgml−1. [Copyright &y& Elsevier]
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- 2009
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7. Variation of CO2/CO ratio during pure-oxidation of feed coal.
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Li, Jin-liang, Lu, Wei, Liang, Yun-tao, Qi, Guan-sheng, Kong, Biao, and Hu, Xiang-ming
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SPONTANEOUS combustion , *COAL combustion , *COAL , *LOW temperatures , *ANIMAL feeds - Abstract
Since the CO 2 /CO ratio was found to be unaffected by the ventilation flow rate, it is an excellent tool to evaluate the state of coal spontaneous combustion. However, the existing studies generally regard coal-oxygen reaction as a total package reaction, which leads to the mutual interference of CO 2 /CO produced by pure oxidation, pyrolysis and physical desorption. Besides, the reasons for the change of CO 2 /CO ratio are not clear. Therefore, a method was designed to obtain the gas production characteristics of pure oxidation pathway. At the same time, the relationship between the change of active groups and CO 2 /CO during pure oxidation was investigated by means of in-situ FTIR and model compounds. The experimental results show that at lower temperatures, the CO 2 produced in coal mainly comes from physical desorption and pyrolysis, which will interfere with the change of CO 2 /CO. The new method can eliminate the influences of them. It is also concluded that the ratio of CO 2 /CO produced by pure oxidation pathway exhibits obvious segmentation. With the increase of temperature, it can be divided into four stages, gradual participation of different active groups in coal is the main reason for the segmentation and determines the initial temperature range in each stage. The CO 2 /CO ratio and equilibrium value are mainly affected by the hydroxyl content in coal. The accuracy of coal spontaneous combustion can be improved based on the segmentation of CO 2 /CO production by pure oxidation. [ABSTRACT FROM AUTHOR]
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- 2020
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8. Calculation method for the ultimate bearing capacity of pressure-cast-in-situ pile with spray-expanded frustum.
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Liu, Jing-hang, Zhang, Qian-qing, Li, Jin-liang, and Cui, Wei
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FAILURE mode & effects analysis , *FRICTION - Abstract
In this paper, the new type of Pressure-cast-in-situ pile with spray-expanded frustum (PPSF) developed by the authors is composed of pile body, ribbed plate, and expanded body with double frustum. The PPSF has the advantages of high bearing capacity, small settlement, high construction speed, and significant economic and environmental benefits. To evaluate the ultimate bearing capacity of PPSF, a calculation method is proposed considering the special shape of PPSF. The ultimate bearing capacity of PPSF is considered as the sum of three parts, e.g., the ultimate bearing capacity of expanded body with double frustum, the ultimate skin friction of pile body, and the ultimate end resistance of pile base. The failure mode of the soil around the expanded body with double frustum is described based on the Meyerhof's bearing capacity theory. The calculation formula for the ultimate bearing capacity of the expanded body with double frustum is established using the sliding block balance method. The rationality of the calculation method is verified by three cases. [ABSTRACT FROM AUTHOR]
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- 2024
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9. Daphmacrimines A−K, Daphniphyllum alkaloids from Daphniphyllum macropodum Miq.
- Author
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Xu, Li-Li, Niu, Zhen-Peng, Chen, Duo-Zhi, Zhang, Yu, Zhao, Qian, Liang, Hong, Li, Sheng, Li, Jin-Liang, Ding, Xiao, Yang, Chong-Lin, and Hao, Xiao-Jiang
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X-ray crystallography , *ALKALOIDS , *STEREOCHEMISTRY , *NEOLIGNANS - Abstract
Daphmacrimines A–K (1 – 11) were isolated from the leaves and stems of Daphniphyllum macropodum Miq. Their structures and stereochemistries were determined by extensive techniques, including HRESIMS, NMR, ECD, IR, and single-crystal X-ray crystallography. Daphmacrimines A–D (1 – 4) are unprecedented Daphniphyllum alkaloids with a 2-oxazolidinone ring. Daphmacrimine I (9) contains a nitrile group, which is relatively rare in naturally occurring alkaloids. The abilities of daphmacrimines A–D and daphmacrimines G–K to enhance lysosomal biogenesis were evaluated through LysoTracker Red staining. Daphmacrimine K (11) can induce lysosomal biogenesis and promote autophagic flux. Eleven previously undescribed Daphniphyllum alkaloids daphmacrimines A–K (1 – 11), were isolated from the leaves and stems of Daphniphyllum macropodum Miq. Daphmacrimines A–D (1 – 4) were unprecedented Daphniphyllum alkaloids with a 2-oxazolidinone ring. Daphmacrimine I (9) contains a nitrile group which is relatively rare in naturally occurring alkaloids. Furthermore, the abilities of daphmacrimines A–D (1 – 4) and daphmacrimines G–K (7 – 11) to enhance lysosomal biogenesis were evaluated through LysoTracker Red staining. Daphmacrimine K (11) could induce lysosomal biogenesis and promote autophagic flux. [Display omitted] • Eleven undescribed Daphniphyllum alkaloids were isolated from the leaves and stems of Daphniphyllum macropodum Miq. • Daphmacrimines A–D (1 – 4) were unprecedented Daphniphyllum alkaloids with a 2-oxazolidinone ring. • Daphmacrimine I (9) contains a nitrile group which is relatively rare in naturally occurring alkaloids. • Daphmacrimine K (11) could induce lysosomal biogenesis and promote autophagic flux. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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10. Addition of aldehydes with allyltrichlorosilane catalyzed by chiral bis-N–O secondary amides.
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Deng, Yu, Pan, Wei, Pei, Yu-Ning, Li, Jin-Liang, Bai, Bing, and Zhu, Hua-Jie
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ALDEHYDES , *TRICHLOROSILANE , *ORGANOCATALYSIS , *CHIRALITY , *DIACYLAMINES , *ALLYLATION , *ENANTIOSELECTIVE catalysis - Abstract
Abstract: New axially N-oxide amides derived from l-tryptophan were prepared and used as organocatalysts in enantioselective allylation of aromatic aldehydes with allyltrichlorosilanes. The corresponding addition adducts homoallylic chiral alcohols obtained high enantioselectivities (up to 96% ee) when 1 mol % of catalyst was used. The unexpected result is the addition product's absolute configuration is R when (R)-chiral amides was used, in contrast, it was (S) when (R)-chiral methyl ester were used in allylation. It exhibited that the N atoms of amides take part in the transition state procedure. [Copyright &y& Elsevier]
- Published
- 2013
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11. Failure analysis and design optimization of shrouded fan blade.
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Liu, Yi-Xiong, Cong, Pei-Hong, Wu, Yun-Wu, Li, Jin-Liang, and Wang, Xiang-Ping
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FAILURE analysis , *DESIGN failures , *STRESS concentration , *FINITE element method , *SURFACE cracks - Abstract
• Failure and finite element analyses were performed on shrouded fan blade. • Failure mechanism is multiple source damage under high contact stress mode. • High stress concentration and imperfections at edge of contact surface cause cracks. • Shroud-cutting model with a 3D displacement harmony boundary was established. • Increasing initial tightness and pre-deformation reduces contact stress. In this study, a failure analysis and design optimization of a shrouded blade in a transonic fan were performed. A visible crack was observed on the pressure side of the shroud, and its origin was located using scanning electron microscopy. The results indicate that the initial crack originated from the pressure-side contact surface edge, and several small cracks were observed in the source region. To determine the reasons for the failure, a shroud-cutting model with a three-dimensional displacement harmony boundary was established. The crack propagation process was simulated, and the stress intensity factor values along the crack front were calculated. Subsequently, a nonlinear static strength analysis was performed, which indicated that stress concentration at the crack origin led to crack initiation. Design optimization considering the pre-deformation angle, friction factor, and initial tightness was performed to determine the figure of merit of the design. The wear pattern of the refined shrouded fan blade demonstrated that the optimized design was effective, with a satisfactory contact state after the engine test. The proposed optimization method is cost-effective and can be used in practical engineering applications. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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