检索结果-南通市图书馆

Synthesis of Pb(OH)2/rGO Catalyst for Conversion of Sugar to Lactic Acid in Water

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： guan-hua Hou Li-feng Yan Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) University of Science and Technology of China Hefei 230026 China

Conversion of sugars from biomass to platform chemicals or fuels is an attracting topic for the utilization of biomass. Pb2+ ion is an efficient catalyst for the degradation of sugar to lactic acid, and it will be better to fix lead on a solid catalyst to reduce the risk of exposure of Pb2+ to environment. Here, a simple method has been developed to prepare a composite catalyst of Pb(OH)2/rGO, where the nanoparticles of Pb(OH)2 in size of 2–5 nm were prepared and fixed over the as-prepared reduced graphene oxide (rGO) nanosheets. The as-obtained catalyst showed an efficient catalytic activity to degrade glucose, fructose, and cellulose in aqueous solution, and the major product is lactic acid. The yield of lactic acid reached 58.7% when fructose was used as the feedstock (433 K and 2.5 MPa N2), and the catalyst can be recycled with high activity. Cellulose can also be directly converted into lactic acid in aqueous solution over the catalyst without extra acid or alkali, and the maximum yield of lactic acid is 31.7%.

关键词： Graphene Lead hydroxide Nanoparticles Composite Catalyst Lactic acid

Determination of Magnolol and Honokiol by Non-aqueous Capillary Electrophoresis

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

Chemical Research in Chinese Universities 2006年第3期22卷 335-338页

作者： TIAN Yi-ling CHEN guan-hua College of Life Science Agricultural University of Hebei Baoding 071001 P. R. China College of Food Science ＆ Technology Agricultural University of Hebei Baoding 071001 P. R. China

Two active principles in traditional Chinese medicine Magnolia officinalis, magnolol and honokiol, were successfully separated by means of nonaqueous capillary electrophoresis. The effect of the composition of a nonaqueous buffer on column efficiency and resolution, and the effect of acid additives on peak shapes were researched. The separation was conducted with a running buffer in a mixture of methanol/aeetonitrile/formamide （ volume ratio ： 1 ： 2 ： 2 ）, in which the concentrations of Tris, acetic acid, and water were 60 retool/L, 0. 04 mmol/L and 5% （ volume fration）, respectively, and the pH^＊（apperent pH） of the running buffer was 8.96. Magnolol and honokiol were separated on baseline within 20 min. The relative standard deviation of the analytes＇ concentrations in the sample is 1.32% for magnolol and 1.60% for honokiol, and the recoveries of the spiked sample are 98.4% for magnolol and 98. 0% for honokiol, respectively.

关键词： Nonaqueous capillary electrophoresis Magnolol Honokiol

A capture probability analytic model for the electromagnetic launched anti-torpedo torpedo

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第2期18卷 261-270页

作者： Bao-qi Wu Xiao-cun guan Shao-hua guan Jing-bin Shi National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China Jiangsu Automation Research Institute Lianyungang 222006China

With the unique characteristics,electromagnetic launch technology is applicable to launch shipborne anti-torpedo torpedo(ATT).This paper aims to establish an analytic model to pre-evaluate the capture probability of the electromagnetic launched *** mathematics model of the multi-stage coilgun and the trajectory of the ATT is established for *** influence factors of the capture probability are analyzed respectively,including the entry point dispersion of the ATT and the position dispersion of the incoming *** the advanced angle interception mode,the ATT search model is obtained according to the positional relationship,and the course error is synthetically calculated according to the differentiation of implicit function.A geometric method to calculate the integral boundaries of the probability density function is proposed,based on the relative motion of the ATT and the incoming *** verify the proposed integral model,the digital simulation and comparison is *** results reveal that the variation trends and the calculation value of the proposed analytic model are coincident with the statistic results from Monte Carlo *** implications of the results regarding the analytic model are discussed.

关键词： Electromagnetic launch Anti-torpedo torpedo Analytic model Dispersion variance Integral boundary

Multipotent mesenchymal stromal cells are fully permissive for human cytomegalovirus infection

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2016年第3期31卷 219-228页

作者： guan-hua Qiao Fei Zhao Shuang Cheng Min-hua Luo State Key Laboratory of Virology Wuhan Institute of VirologyChinese Academy of Sciences

Congenital human cytomegalovirus(HCMV) infection is a leading infectious cause of birth *** studies have reported birth defects with multiple organ maldevelopment in congenital HCMV-infected neonates. Multipotent mesenchymal stromal cells(MSCs) are a group of stem/progenitor cells that are multi-potent and can self-renew, and they play a vital role in multiorgan formation. Whether MSCs are susceptible to HCMV infection is unclear. In this study, MSCs were isolated from Wharton's jelly of the human umbilical cord and identified by their plastic adherence, surface marker pattern, and differentiation capacity. Then, the MSCs were infected with the HCMV Towne strain, and infection status was assessed via determination of viral entry,replication initiation, viral protein expression, and infectious virion release using western blotting,immunofluorescence assays, and plaque forming assays. The results indicate that the isolated MSCs were fully permissive for HCMV infection and provide a preliminary basis for understanding the pathogenesis of HCMV infection in non-nervous system diseases, including multi-organ malformation during fetal development.

关键词： human cytomegalovirus(HCMV) multipotent mesenchymal stromal cells(MSCs) susceptibility umbilical cord Wharton's jelly

Non-Darcian Flow Toward a Finite-Diameter Vertical Well in a Confined Aquifer

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2008年第3期18卷 288-303页

作者： WEN Zhang huaNG guan-hua ZHAN Hong-Bin College o.f Water Conservancy and Civil Engineering China Agricultural University Beijing 100083 （China） Chinese-Israeli International Center for Research and Training in Agriculture Beijing 100083 （China） Department of Geology and Geophysics Texas A＆M University College Station Texas 77843-3115 （USA）

Non-Darcian radial flow toward a finite-diameter, fully penetrating well in a confined aquifer was analyzed on the basis of the Izbash equation with consideration of the wellbore storage effect. We derived semi-analytical solutions of drawdown by using the Boltzmann transform, and obtained approximate analytical solutions of the drawdown at early and late times. MATLAB programs were developed to facilitate computation of the semi-analytical solutions. The turbulence factor v which was directly related to the pumping rate appeared to have negligible influence upon the wellbore well function at early times, but imposed significant influence at intermediate and late times. However, the turbulence factor v imposed non-negligible influence upon the aquifer well function during the entire pumping period, provided that the observation point was not sufficiently close to the wellbore. Sensitivity analysis indicated that the power index n in the Izbash equation had less influence on the type curves at the face of the pumping wellbore, but had much greater influence upon the well function in the aquifer. As the n values increased, the drawdown in the aquifer decreased at early times and increased at late times. The Boltzmann transformation could only be used in an approximate sense for radial non-Darcian flow problems. This approximation would provide accurate solutions at early times, and introduce small but consistent discrepancies at intermediate and late times for the wellbore well function.

关键词： finite-diameter well non-Darcian flow' type curves well function wellbore storage

Study,application and communication of traditional medicine among the Belt and Road Countries

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 2018年第4期32卷 241-242页

作者： guan-hua DU Institute of Materia Medica Chinese Academy of Medical Science and Peking Union Medical College Chinese Pharmacological Society Beijing 100050 China

Most medicines used in the ancient people were the natural raw products,and most of them were discovered during the *** the differences of the geography,climate and living habits among the different regions,various medicines were used for treatment of diseases in local *** communication of medicines made a lot of benefits for people living in different *** of medicines promote the application of medicines and natural *** early as 2000 year ago,the ancient Chinese people had sent a lot of medicines to many countries among the Belt and Road during their visiting to these *** medicines were the main contents for communication besides of the silk and *** medicines has been used for treatment of diseases for local people till *** the Belt and Road,many spices,fruits,seeds produced in different regions were spread among the *** of them were planted and produced in *** the important events were the application of these special products,such as spices,fruits and seeds used as medicines under the guidance of traditional Chinese medical *** drugs have played major roles in the treatment of diseases and development of traditional Chinese *** of the medicines,including the medical theory and drugs,improved the medical standards in *** example,ancient Persian medicine had a significant impact on the use of traditional Chinese medicine in the prescription *** also,the medicines made important contributions to the health of people in the countries on the Belt and ***,the science and techniques have been *** principles and understandings are different from the ancient ***,the medicines developed in the countries on the Belt and Road still used for the health of human *** research the ancient medicines by the modern techniques and through co-operation will greatly contribute to human healthand promote the social progress and e

关键词：中医药物治疗化学分析临床分析

Effectiveness of hot deformation and subsequent annealing forβgrain refinement of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第12期40卷 3608-3615页

作者： Yi-Min Cui Wei-Wei Zheng Chao-hua Li guan-hua Cao Yan-Dong Wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

High strength titanium alloys suffer from a limited combination of strength and *** their micro structure,the coarseβgrain is a detrimental *** the present study,the effects of hot deformation and annealing treatment on theβgrain refinement of Ti-5 Al-5 Mo-5 V-1 Cr-1 Fe(TC18)titanium alloy have been investigated by using electronic backscattered diffraction(EBSD)and transmission electric microscopy(TEM).Hot compression tests of TC18 alloy were performed between 1073 and 1223 K at strain rates of 0.01 and 0.10 s^(-1)·Subsequent annealing treatments were conducted to investigate the effect of deformation microstructure on the recrystallization behavior ofβ*** results indicate that dynamic recovery(DRV)is the dominant restoration mechanism during hot *** dynamic recrystallization(dDRX)is significantly limited at a higher temperature in theβregion,whereas continuous dynamic recrystallization(cDRX)of theβphase is observed at a higher strain rate in the(α+β)*** final annealing microstructure is highly dependent on the deformation *** dDRX during hot deformation could not effectively refine theβ*** refined and uniformβgrains with an average grain size of 12μm are achieved by combining hot deformation and subsequent annealing in the(α+β)*** study provides a guide for theβgrain refinement of high strength titanium alloys.

关键词： Grain refinement Dynamic recrystallization Hot deformation High strength titanium alloy

Modeling Soil Water Retention Curve with a Fractal Method

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2006年第2期16卷 137-146页

作者： huaNG guan-hua ZHANG Ren-Duo huaNG Quan-Zhong Department of Irrigation and Drainage Chinese-Israeli International Center for Research and Training in Agriculture China Agricultural University Beijing 100083 （China）. Department of Renewable Resources University of Wyoming Laramie WY 82071-3354 （USA）

Many empirical models have been developed to describe the soil water retention curve (SWRC). In this study, a fractal model for SWRC was derived with a specially constructed Menger sponge to describe the fractal scaling behavior of soil; relationships were established among the fractal dimension of SWRC, the fractal dimension of soil mass, and soil texture; and the model was used to estimate SWRC with the estimated results being compared to experimental data for verification. The derived fractal model was in a power-law form, similar to the Brooks-Corey and Campbell empirical functions. Experimental data of particle size distribution (PSD), texture, and soil water retention for 10 soils collected at different places in China were used to estimate the fractal dimension of SWRC and the mass fractal dimension. The fractal dimension of SWRC and the mass fractal dimension were linearly related. Also, both of the fractal dimensions were dependent on soil texture, i.e., clay and sand contents. Expressions were proposed to quantify the relationships. Based on the relationships, four methods were used to determine the fractal dimension of SWRC and the model was applied to estimate soil water content at a wide range of tension values. The estimated results compared well with the measured data having relative errors less than 10% for over 60% of the measurements. Thus, this model, estimating the fractal dimension using soil textural data, offered an alternative for predicting SWRC.

关键词： fractal dimension soil texture soil water retention curve

Antithrombotic effects of the effective components group of Xiaoshuantongluo formula in vivo and in vitro

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2015年第2期13卷 99-107页

作者： ZHAO Yan CHU Xiao PANG Xiao-Bin WANG Shao-hua DU guan-hua Qingdao Municipal Hospital Affiliated Hospital of Medical College Qingdao University Qingdao University Pharmaceutical Institute Henan University National Centre for Pharmaceutical Screening Institute of Materia Medica Chinese Academy of Medical Science and Peking Union Medical College

The present study was designed to investigate the antithrombotic effects and underlying mechanisms of the effective components group(ECG) of Xiaoshuantongluo recipe(XECG) and to further verify the rationality and feasibility of ECG-guided methodology in traditional Chinese medicine(TCM) research. The arterial thrombosis model induced by ferric chloride(FeC l3) oxidation and the venous thrombosis model induced by inferior vena cava ligation were established to evaluate the antithrombotic potential of XECG. Our results indicated that XECG significantly prolonged the time to occlusion, activated partial thromboplastin time(APTT), and prothrombin time(PT), and markedly inhibited adenosine diphosphate(ADP)-induced platelet aggregation in the 20% Fe Cl3-induced arterial thrombosis model. The superoxide dismutase(SOD) activity was significantly increased and the levels of malondialdehyde(MDA) and nitric oxide(NO) were dramatically decreased in the plasma of arterial thrombosis rats after XECG treatment for 12 days. Furthermore, XECG markedly reduced the weight of thrombus formed by inferior vena cava ligation. Additionally, XECG exhibited 2,2-diphenyl-1-picrylhydrazyl(DPPH) free radical scavenging activity and protective effect on mitochondrial lipid peroxidation. In summary, XECG played an important role in the prevention of thrombosis through interacting with multiple targets, including inhibition of platelet aggregation and coagulation and repression of oxidative stress. The ECG-guided methodology was validated as a feasible tool in TCM research.

关键词： Traditional Chinese medicine Effective components group Thrombosis Platelet aggregation Oxidative stress Radical scavenging