检索结果-南通市图书馆

Removal of 5-Amino-2-chlorotoluene-4-sulfonic and Chlorhydric Acids From Wastewater by Weakly Basic Resin: Equilibrium and Kinetics

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2007年第5期20卷 392-397页

作者： chang-hai li Binzhou University Binzhou 256603ShandongChina School of Chemical Engineering Changchun University of TechnologyChangchun 130012JilinChina

Objective To study the adsorption of 5-Amino-2-chlorotoluene-4-sulfonic (CLT) and chlorhydric (HCl) acids from wastewater by weakly basic resin. Methods The kinetics and isotherm were studied. Thermodynamic parameters for the adsorption of acids were calculated and discussed. Results The adsorption of CLT and HCl acids followed Langmuir isotherm and the first-order kinetics model. Conclusion The adsorptive affinity of the two acids on D301R is in the order of CLT acid 〉 HCl acid. CLT and HCl acids can be separated.

关键词： 5-Amino-2-chlorotoluene-4-sulfonic acid Chlorhydric acid Adsorption Weakly basic resin

Recovery of Aniline from Wastewater by Nitrobenzene Extraction Enhanced with Salting-Out Effect

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2010年第3期23卷 208-212页

作者： chang-hai li Department of Chemical Engineering Binzhou UniversityBinzhou 256603ShangdongChina School of Chemical Engineering Changchun University of TechnologyChangchun 130012JilinChina

Objective Nitrobenzene extraction enhanced by salting-out effect was employed to recover aniline from wastewater at 25 ℃. Method Batchwise experiments were conducted to elucidate the influence of various operating variables on the extracting performance, including acidity of wastewater, initial aniline concentration, ratios of solvent to wastewater, extraction stages, concentrations and different types of inorganic salts, such as NaCl, KCI, Na2SO4, CaCl2 and K29O4. Results Nitrobenzene with a concentration of 20% and a pH value of 9.1 at the temperature of 25 ℃ together with NaCl of a concentration of 14 wt.% realized nearly 100% aniline recovery at the fifth stage of wastewater treatment. Conclusions High pH values and volume ratios of nitrobenzene/wastewater are more suitable for recovery of aniline. In addition, recovery of aniline is significantly elevated with increase of the concentration of salts, whose promoting effects are in the following order: NaCI〉Na2SO4〉K2SO4〉CaC12〉KCI on the weight basis of wastewater. Furthermore, aniline in wastewater can be almost completely recovered by five-stage sequential nitrobenzene extraction, which is promoted continuously by the salting-out effect.

关键词： Aniline Nitrobenzene Extraction Salting-out

Effect of exit location on flow of mice under emergency condition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第1期28卷 290-299页

作者： Teng Zhang Shen-Shi Huang Xue-lin Zhang Shou-Xiang Lu chang-hai li State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230027China School of Civil Engineering Chongqing Three Gorges UniversityChongqing 404000China

The evacuation of crowds in a building has always emerged as a vital issue in many accidents. The geometrical structure of a room, especially the exit design has a great influence on crowd evacuation under emergency conditions. In this paper, the effect of exit location of a room on crowd evacuation in an emergency is investigated with mice. Two different exits are set in a rectangular chamber. One is located in the middle of a wall(middle-exit) and the other is at the corner of the chamber(corner-exit). Arching and clogging are observed in the flow of mice. The result based on the escape trajectories of mice shows a dynamic balance in the arch near the exit wherever the exit is located. We demonstrate that the occupant position in the arch has an effect on the escape sequence of mice. At a low stimulation level, the narrow middle-exit is more effective in increasing the flow rate of mice than the narrow corner-exit. However, the opposite result appears when the exit becomes wider. At a high stimulation level, the effect of exit location on flow of mice tends to be weakened. The results suggest that the specific level of stimulation needs to be taken into account when optimizing the evacuation efficiency of a crowd through the geometrical structure of a room.

关键词： exit location evacuation mice stimulation level

Stress-induced growth-differentiation factor 15 plays an intriguing role in cardiovascular diseases

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第7期126卷 1350-1354页

作者： liU hai-tao WANG hai-chang TAO ling li Cheng-xiang li Fei ZHANG Yu-yang liU Bo-wu Department of Cardiology Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China

Objective To provide an overview of the current knowledge of growth-differentiation factor 15 （GDF-15） in heart disease. Data sources To identify relevant publications, we searched PubMED database combining the textual terms of heart, cardiac, cardiovascular disease with GDF-15. Study selection Well-controlled, relatively large-scale, retrospective studies as well as meaningful individual cases were all selected as materials. Results GDF-15 is a distant member of the transforming growth factor-13 cytokine superfamily. In myocardium, GDF-15 is weakly expressed under physiological conditions. However, its expression level is increased in response to pathological stress. Growing evidence indicate that elevated levels of GDF-15 is a promising prognostic biomarker in cardiovascular diseases. Moreover, GDF-15 exhibits the properties of endogenous anti-hypertrophy of cardiomyocytes and protecting the heart suffering from ischemia and reperfusion insult. Conclusion Ve GDF-15 may be a promising biomarker for evaluation and management of patient with cardiovascular diseases, and have potential protective properties on myocardium.

关键词： growth-differentiation factor 15 biomarker cardiovascular disease

Protection　of　L－arginine　against　lysophosphatidy　lcholine－inducedmy　ocardi　alinjury　inisolated　ratheart

在线全文

学校读者我要写书评

暂无评论

中国药理学与毒理学杂志 1996年第2期 6-9页

作者： TANG Yu-hai, PENG chang-Fu, li Yuan-Jian 2, XIONG Yan (Department of Pharmacology, Hunan Medical University, changsha 410078)

在离体大鼠心脏观察了Ｌ－精氨酸对溶血性磷脂酰胆碱（ＬＰＣ）损伤心肌作用的影响．ＬＰＣ（５μｍｏｌ·Ｌ－１）引起心率减慢，冠脉流量减少，心脏功能降低（ＬＶＰ和ＬＶｄｐ／ｄｔｍａｘ下降）及肌酸激酶（ＣＰＫ）释放增加．３０... 详细信息

在离体大鼠心脏观察了Ｌ－精氨酸对溶血性磷脂酰胆碱（ＬＰＣ）损伤心肌作用的影响．ＬＰＣ（５μｍｏｌ·Ｌ－１）引起心率减慢，冠脉流量减少，心脏功能降低（ＬＶＰ和ＬＶｄｐ／ｄｔｍａｘ下降）及肌酸激酶（ＣＰＫ）释放增加．３０μｍｏｌ·Ｌ－１Ｌ－精氨酸能促进心率恢复，增加冠脉流量和改善心脏功能，但仅ＬＶｄＰ／ｄｔｍａｘ恢复显示统计学差异；３００μｍｏｌ·Ｌ－１Ｌ－精氨酸能显著改善心脏功能，促进心率和冠脉流量的恢复，减少ＣＰＫ释放．结果提示：Ｌ－精氨酸对ＬＰＣ所致心肌损伤具有一定的保护作用．

关键词：精氨酸溶血性磷脂酰胆碱心脏大鼠

Akt-centered amplification loop plays a critical role in vascular endothelial growth factor/stromal cell-derived factor 1-αcross-talk and cardioprotection

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第22期124卷 3800-3805页

作者： GUO Wen-yi ZHANG Dian-xin li Wei-jie ZHAO Zhi-jing liU Bing WANG hai-chang li Fei Department of Cardiology Xijing Hospital Fourth Military Medical University Xi＇an Shaanxi 710032 China

Background Vascular endothelial growth factor （VEGF） is one of major mediators of angiogenesis and survival factor in some tissue, however, its direct effects on cardiomyocytes remain poorly understood. Methods Rat neonatal ventricular myocytes were cultured in vitro. Akt phosphorylation was measured by Western blotting; the expression of stromal cell-derived factor α（SDF-1α）/CXCR4 axis was evaluated by real-time PCR and Western blotting. LY294002 and AMD3100 were used to interfere with the signaling of VEGF and SDF-1α/CXCR4 axis. Cardiac myocytes viability and injury were evaluated by trypan blue staining and lactate dehydrogenase （LDH） release. Results Treatment of neonatal rat ventricular myocytes with VEGF induced phosphorylation of Akt in a dose and FIk-1 dependent manner. VEGF attenuated H202 induced cardiac myocyte death. The phosphoinositol-3-kinase （PI3K） inhibitor, LY294002 and FIk-1 antibody abolished the beneficial effects of VEGF on H202 induced cell death. In the mean time SDF-1α-CXCR4 axis was up-regulated by VEGF through PI3K-Akt signaling and contributed to the protective effects of VEGF on H202 induced cell death. Interestingly, SDF-1α also promoted production of VEGF in cultured cardiac myocytes and LY294002 reversed the up-reguLation of VEGF induced by SDF-1α. Conclusion VEGF has direct protective effects on cardiomyocytes; a crosstalk between VEGF and SDF-1α through PI3K-Akt serves a survival role in cardiomvocvtes in vitro.

关键词： vascular endothelial growth factor cardiomyocyte, stromal cell-derived factor a survival PI3K-Akt

破片群侵彻纤维增强层合板破坏机理及穿甲能力等效方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

兵工学报 2018年第4期39卷 707-716页

作者：李典侯海量朱锡陈长海李茂海军工程大学舰船与海洋学院湖北武汉430033

为开展破片群侵彻下纤维增强层合板的防护设计,采用瞬态非线性有限元,进行了破片群侵彻下纤维增强层合板破坏机理的研究。阐明破片群侵彻下纤维增强层合板的破坏模式及过程,揭示破片群侵彻能力的增强效应,并分析破片数量、破片初速和破... 详细信息

为开展破片群侵彻下纤维增强层合板的防护设计,采用瞬态非线性有限元,进行了破片群侵彻下纤维增强层合板破坏机理的研究。阐明破片群侵彻下纤维增强层合板的破坏模式及过程,揭示破片群侵彻能力的增强效应,并分析破片数量、破片初速和破片间距因素对其影响规律,提出了破片群穿甲能力的等效方法。结果表明:与单破片侵彻相比,破片群的穿甲能力大大增强,其可与增大长度的单破片穿甲能力等效,为破片群侵彻下结构的穿甲防护设计提供了参考。

关键词：纤维增强层合板破片群破坏机理穿甲能力等效方法

Heat stress inhibits proliferation, promotes growth, and induces apoptosis in cultured Lantang swine skeletal muscle satellite cells

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2015年第6期16卷 549-559页

作者： Chun-qi GAO Yin-ling ZHAO hai-chang li Wei-guo SUI Hui-chao YAN Xiu-qi WANG College of Animal Science South China Agricultural University/National Engineering Research Center for Breeding Swine Industry /Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding Davis Heart & Lung Research Institute Wexner Medical Center at the Ohio State University

Proliferation suppression and apoptosis are the prominent characteristics induced by heat stress（HS） in cells, whereas the effects of HS on cell growth（mass accumulation） are unknown. In this study, Lantang swine（an indigenous breed of China） skeletal muscle satellite cells（SCs） were pre-cultured at 37 °C for 24 h. The HS group was subjected to HS at 41 °C, while the control group was maintained at 37 °C. Heat shock protein 70（HSP70） expression and SC size are significantly increased（P〈0.05） by HS, but cell proliferation is suppressed（P〈0.05） and apoptosis is induced（P〈0.05）. HS led to a lower percentage of SCs in the G0/G1 phase（P〈0.05） together with a higher percentage of SCs in the S phase（P〈0.05）. However, the percentage of SCs in the G2/M phase was decreased（P〈0.05） at 48 h but then increased（P〈0.05） at 72 h with HS. In addition, the phosphorylation ratios of protein kinase b（Akt）, ribosomal protein S6 kinase（S6K）, and ribosomal protein S6 were increased（P〈0.05） by HS. Nevertheless, the phosphorylation ratios of the 4E binding protein 1 and the eukaryotic initiation factor-4E were indistinguishable（P〉0.05） from those of the control group. The phosphorylation ratio of the mammalian target of rapamycin（m TOR）（Ser^2448） increased（P〈0.05） within 48 h, and apparent differences were abrogated at 72 h（P〉0.05）. Moreover, cleaved caspase-3 expression was increased at 72 h（P〈0.05）. These findings indicate that HS induces apoptosis and disrupts cell cycle distribution to decrease the number of cells. Additionally, HS can promote SC growth via an activated Akt/m TOR/S6 K signaling pathway.

关键词： Heat stress Swine Cell proliferation Cell growth Apoptosis Akt/mTOR/S6K pathway

聚氯乙烯火灾烟气环境中无铅焊料腐蚀动力学预测模型

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2024年第7期34卷 2304-2312页

作者：李倩林锦赵梦珂黎昌海陆守香中国科学技术大学火灾科学国家重点实验室合肥230026

采用质量损失法研究聚氯乙烯火灾烟气环境中283.15~323.15 K温度范围内无铅Sn-3.0Ag焊料的腐蚀动力学、表面微观结构和腐蚀机理。结果表明,随着温度从283.15 K升高到323.15 K,Sn-3.0Ag焊料的质量损失从(22.09±2.01)g/m^(2)增加到(44.66... 详细信息

采用质量损失法研究聚氯乙烯火灾烟气环境中283.15~323.15 K温度范围内无铅Sn-3.0Ag焊料的腐蚀动力学、表面微观结构和腐蚀机理。结果表明,随着温度从283.15 K升高到323.15 K,Sn-3.0Ag焊料的质量损失从(22.09±2.01)g/m^(2)增加到(44.66±1.20)g/m^(2)。此外,腐蚀动力学符合阿伦尼乌斯定律。Sn-3.0Ag焊料表面腐蚀产物呈叠加生长趋势。在283.15 K,Sn-3.0Ag焊料的表面出现大量的腐蚀产物。Sn-3.0Ag无铅焊料的腐蚀过程为电化学腐蚀,阴极发生析氢和吸氧反应,阳极发生富锡相的溶解。腐蚀产物为Sn_(21)Cl_(16)(OH)_(14)O_(6)、SnO_(2)和SnO。

关键词：腐蚀预测模型 Sn-3.0Ag焊料火灾烟气温度