检索结果-南通市图书馆

Study of the Electrical Double Layer of a Spherical Micelle: Functional Theoretical Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第7期12卷 645-646页

作者： zheng Wu WANG Gan Zuo LI Da Ren guan Xi Zhang yi An Jing LOU Key Lab of Colloid and Interface Chemistry for State Education Ministry Shandong UniversityJi’nan 250100 Institute of Theoretical Chemistry Shandong University Ji’nan 250100 Langmuir Ccnter for Colloids and Interfaces Columbia UniversityNY10027U.S.A

By using the iterative method in functional theory, an analytic expression of the Poisson-Boltzmann equation (PB eq.), which describes the distribution of the potential of electrical double layer of a spherical micelle, has been carried out under the general potential condition for the first time. The method also can give the radius, the surface potential, and the thickness of the layer.

关键词： Functional analytic theory spherical micelle electrical double layer

Differences in vascular endothelial function and serum proteome between obese people with phlegm-dampness constitution and balanced constitution

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2024年第1期44卷 188-196页

作者： ZHU Linghui SUN Ziwei guan Yuanyuan LIU Meiyi zheng yi YU Ruoxi WANG Qi LI Lingru School of Chinese Medicine Beijing University of Chinese MedicineBeijing 102488China National Institute of TCM Constitution and Preventive Medicine Beijing University of Chinese MedicineBeijing 100029China

OBJECTIVE:To evaluate the extent of vascular endothelial dysfunction and preliminary identify serum protein biomarkers associated with obese individuals at risk for cardiovascular disease(CVD).METHODS:Fifteen obese volunteers with the phlegmdampness constitution or balanced constitution were recruited for this study *** clinical baseline data was collected,and the vascular endothelial function was evaluated using the EndoPAT?.Blood samples were collected for the serum proteome *** differences in the serum protein expression levels between the two groups were detected and the protein interaction network analysis,correlation analysis,receiver operating characteristic(ROC)curve analysis,and random forest model investigation were ***:There were no statistical differences found in the baseline *** vascular endothelial function,the reactive hyperemia index(RHI)of the phlegm-dampness constitution obese group was significantly lower than that of the balanced constitution obese group(1.46±0.30 vs 2.82±0.78,P<0.0001),indicating vascular endothelial *** are 66 differentially expressed serum proteins between the two *** A2(Apo A2),angiotensin-converting enzyme 2(ACE-2),interleukin-33(IL-33),and forkhead box P3(FoxP3)showed significant differences and area under curve values of their ROC curves were greater than 0.7 and correlated significantly with ***:Vascular endothelial dysfunction was present in the phlegm-dampness constitution obese ***,alterations in the expression levels of key serum proteins,including Apo A2,ACE-2,IL-33,and Fox P3 could serve as potential biomarkers in the obese population at risk of CVD.

关键词： obesity phlegm-dampness constitution vascular endothelial function proteome reactive hyperemia index

Progress on statistical models of evaluating inclusions in clean steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第8期29卷 1153-1163页

作者： zheng Wang Yue-hui guan Hai-wen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Jiang yin Xing Cheng Alloy Material Co. Ltd.Jiangyin 214432JiangsuChina

Non-metallic inclusions are critical for the fatigue failure of clean steels in service;especially,the large and hard inclusions are *** it is not possible to measure all the inclusions in the large-volume clean steels,statistical models have been developed to evaluate inclusions,aiming at predicting the maximum inclusion size in the large volume from the data of inclusions,which are derived from the limited observations on small-volume *** statistical models were reviewed together with their supporting *** particular,the block maxima and the threshold types of models were discussed through a thorough comparison as they are both widely used and based on the extreme value *** predicted results not only are used to distinguish the different cleanliness levels of steels,but also help to estimate fatigue ***,future research is proposed to focus on tackling the present difficulties encountered by statistical models,including the sufficient credibility of obtained results and the robustness of models for applications.

关键词： Clean steel Maximum inclusion prediction Statistical model Extreme value theory Fatigue failure

Removal of ammonium and nitrate through Anammox and FeS-driven autotrophic denitrification

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

Frontiers of Environmental Science & Engineering 2023年第6期17卷 127-139页

作者： Yanfei Wang Xiaona zheng guangxue Wu Yuntao guan guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China State Environmental Protection Key Laboratory of Microorganism Application and Risk Control School of EnvironmentTsinghua UniversityBeijing 100084China Civil Engineering School of EngineeringCollege of Science and EngineeringNational University of IrelandGalwayGalway H91 TK33Ireland

An autotrophic denitrifying bioreactor with iron sulfide(FeS)as the electron donor was operated to remove ammonium(NH_(4)^(+))and nitrate(NO_(3)^(-))synergistically from wastewater for more than 298 *** concentration of FeS greatly affected the removal of NH_(4)^(+)/NO_(3)^(-).Additionally,a low hydraulic retention time worsened the removal efficiency of NH_(4)^(+)/NO_(3)^(-).When the hydraulic retention time was 12 h,the optimal removal was achieved with NH_(4)^(+)and NO_(3)^(-)removal percentages both above 88%,and the corresponding nitrogen removal loading rates of NH_(4)^(+)and NO_(3)^(-)were 49.1 and 44.0 mg/(L·d),*** removal of NH_(4)^(+)mainly occurred in the bottom section of the bioreactor through sulfate/ferric reducing anaerobic ammonium oxidation(Sulfammox/Feammox),nitrification,and anaerobic ammonium oxidation(Anammox)by functional microbes such as Nitrospira,Nitrosomonas,and Candidatus ***,NO_(3)^(-)was mainly removed in the middle and upper sections of the bioreactor through autotrophic denitrification by Ferritrophicum,Thiobacillus,Rhodanobacter,and Pseudomonas,which possessed complete denitrification-related genes with high relative abundances.

关键词： Anammox Denitrification FeS NH_(4)^(+)/NO_(3)^(−) Sulfammox

Human Serum-derived Extracellular Vesicles Protect A549 from PM_(2.5)-induced Cell Apoptosis

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2021年第1期34卷 40-49页

作者： ZHOU Qiu Lian BAI Yu zheng GAO Juan DUAN yi LYU yi Cheng guan Long Fei ELKIN Kenneth XIE Yu Ling JIAO zheng WANG Hong Yun Cardiac Regeneration and Ageing Lab Institute of Cardiovascular SciencesSchool of Life ScienceShanghai UniversityShanghai 200444China Shanghai Applied Radiation Institute School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Medicine Shanghai UniversityShanghai 200444China China-America Institute of Neuroscience Beijing Luhe HospitalCapital Medical UniversityBeijing 101149China Department of Neurosurgery Wayne State University School of MedicineDetroitMI 48201USA

Objective Epidemiological studies reveal that exposure to fine particulate matter(aerodynamic diameter≤2.5μm,PM_(2.5))increases the morbidity and mortality of respiratory *** evidence suggests that human circulating extracellular vesicles(EVs)may offer protective effects against injury caused by particulate ***,however,whether EVs attenuate PM_(2.5)-induced A549 cell apoptosis is *** EVs were isolated from the serum of healthy subjects,quantified via nanoparticle tracking analysis,and qualified by the marker protein ***_(2.5)-exposed(50μg/mL)A549 cells were pretreated with 10μg/mL EVs for 24 *** viability,cell apoptosis,and AKT activation were assessed via Cell Counting Kit-8,flow cytometry,and Western blot,respectively.A rescue experiment was also performed using MK2206,an AKT *** PM_(2.5)exposure caused a 100%in crease in cell *** treatme nt reduced cell apoptosis by 10%,promoted cell survival,and inhibited the PM_(2.5)-induced upregulation of Bax/Bcl2 and cleaved caspase 3/caspase 3 in PM_(2.5)-exposed A549 ***,EVs treatment reversed PM_(2.5)-induced reductions in p-AKT^(Thr308)and p-AKT^(Ser473).A KT inhibition attenuated the anti-apoptotic effect of EVs treatment on PM_(2.5)-exposed A549 *** EVs treatment promotes cell survival and attenuates PM_(2.5)-induced cell apoptosis via AKT *** serum-derived EVs may be an efficacious novel therapeutic strategy in PM_(2.5)-induced lung injury.

关键词： Cell apoptosis PM_(2.5) Extracellular vesicles Therapy AKT

Nanoforming of transferred metal contacts for enhanced twodimensional field effect transistors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3210-3216页

作者： Shuoheng Xu zheng Huang Jie guan Yaowu Hu The Institute of Technological Sciences Wuhan UniversityWuhan 430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Physics Southeast UniversityNanjing 211189China

Two-dimensional transition metal chalcogenides(2D-TMDs)have attracted much attention because of their unique layered structure and physical properties for transistor *** transferred metal contacts on these low-dimensional materials or their homogeneous and heterogeneous multilayers have generated huge interest to avoid deposition *** this paper,we show that there are large physical gaps at both the edge contact and surface contact between the transferred electrodes and the 2D materials.A method called laser shock induced superplastic deformation(LSISD)is proposed to tackle this issue and enhance the performance of the *** enhancement mechanism was investigated by molecular dynamics(MD)simulations of the nanoforming process,atomic force microscopy(AFM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)characterizations of the interfaces,and density functional theory(DFT)*** force effect of laser shock can reduce the contact gap between metals and *** electrical performances of the transistors before and after LSISD,along with MD simulations,are used to find the optimal process *** addition,this paper applies the LSISD method to the short-channel MoS_(2)/graphene vertical transistors to show potential improvement in interface contact and electrical *** paper demonstrates the first report on using mechanical force induced by laser shock to enhance metal–semiconductor interfaces and transistor performances.

关键词： laser shock nanoforming metal-semiconductor contact electronics two-dimensional transistors

Constrained Moving Path Following Control for UAV With Robust Control Barrier Function

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

IEEE/CAA Journal of Automatica Sinica 2023年第7期10卷 1557-1570页

作者： Zewei zheng Jiazhe Li Zhiyuan guan Zongyu Zuo Seventh Research Division School of Automation Science and Electrical EngineeringBeihang UniversityBeijing 100191 Beijing Institute of Control Engineering Beijing 100094China

This paper studies the moving path following(MPF)problem for fixed-wing unmanned aerial vehicle(UAV)under output constraints and wind *** vehicle is required to converge to a reference path moving with respect to the inertial frame,while the path following error is not expected to violate the predefined *** from existing moving path following guidance laws,the proposed method removes complex geometric transformation by formulating the moving path following problem into a second-order time-varying control problem.A nominal moving path following guidance law is designed with disturbances and their derivatives estimated by high-order disturbance *** guarantee that the path following error will not exceed the prescribed bounds,a robust control barrier function is developed and incorporated into controller design with quadratic program based *** proposed method does not require the initial position of the UAV to be within predefined *** the safety margin concept makes error-constraint be respected even if in a noisy *** proposed guidance law is validated through numerical simulations of shipboard landing and hardware-in-theloop(HIL)experiments.

关键词： Moving path following(MPF) robust control barrier function safety margin shipboard landing unmanned aerial vehicle(UAV)

Determination of Magnolol and Honokiol by Non-aqueous Capillary Electrophoresis

在线全文

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

Fabrication of cotton nano-powder and its textile application

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第23期53卷 3735-3740页

作者： guan yingTing LI yi School of Textile and Materials Xi'an Polytechnic University Xi'an 710048 China Institute of Textile and Clothing Hong Kong Polytechnic University Hungkom Kowloon Hong Kong

A combination of chemical and mechanical treatment of cotton produced cotton powder (fibrils) with a mean diameter of 97nm is analyzed by Laser Particle Size Analyzer. Transmission Electron Microscope (TEM) study showed that the diameter of the fibrils was about 10―30 nm and the length was from 70nm to over 400 nm. The powder was then coated onto fabrics (100% polyester fabric, 100% wool fabric and 100% cotton fabric). Scanning Electron Microscope (SEM) study showed that cotton fibrils were adhered to the surface of treated fabrics (fibers). The ultraviolet protection factor (UPF) value (AS/NZS 4399: 1996) for cotton fabrics increased about 20% after the treatment. This implies that the treated samples give a better protection from UV light. The moisture management test (MMT) of the fabrics such as wetting time at bottom, top maximum absorption rate, bottom maximum absorption rate, bottom maximum wetted radius and bottom spreading speed, et al., showed that there were significant changes after the treatment. These changes gave better moisture management ability to the treated fabrics and thus made the fabric more comfortable. However, Wide-angle X-ray Diffraction and Fourie Transform Infrared Spectroscopy analysis proved that supermolecular structure and chemical structure of treated fabrics were the same as the original fabrics. Other properties of the treated fabric such as thermal conductivity, wrinkle recovery, hand, et al., did not change. This implied that the basic function of the treated fabrics for the clothing industry was the same as untreated fabrics. This study is a foundation for further researches on textile application.

关键词：棉花微晶纤维素亲水性衣料防水性