检索结果-南通市图书馆

Three industries and wastewater and COD discharge of Beijing

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2000年第4期12卷 474-477页

作者： WANG Yan 1, WANG hong rui 2. NING Da tong 2.(1. Beijing Municipal research {2. of Environmental Protection, Beijing 100037, china 2. {2. of Environmental Sciences, Beijing Normal university, Beijing 100875, china) 北京市环境保护所北京 1 0 0 0 3 北京师范大学北京 1 0 0 875

With the swift development of economy, the water quality of Beijing is becoming worse day by day and hampers the sustainable development obviously. In this paper, the current conditions of the municipal wastewater structure in the industrial sectors are analysed and discussed in terms of the indicators, such as direct wastewater\|discharge coefficient, complete wastewater\|discharge coefficient, direct discharge coefficient of COD and complete discharge coefficient of COD, by taking a year of 1990s as the base year. Some countermeasures are studied and the corresponding recommendations are put forward in order to improve the water environment in Beijing. This provides a scientific ground for coordinating the relationship between the aquatic environment and economic growth in this city.

关键词： direct wastewater discharge coefficient (DWDC) complete wastewater discharge coefficient (CWDC) direct discharge coefficient of COD(DDC of COD) complete discharge coefficient of COD (CDC of COD)

Biochar-based composites for removing chlorinated organic pollutants: Applications, mechanisms, and perspectives

在线全文

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2024年第5期21卷 47-61页

作者： Qingqing Song Fanying kong Bing-Feng Liu Xueting Song hong-Yu Ren State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China School of Water Conservancy and Civil Engineering Northeast Agricultural UniversityHarbin150030China

Chlorinated organic pollutants constitute a significant category of persistent organic pollutants due to their widespread presence in the environment,which is primarily attributed to the expansion of agricultural and industrial *** pollutants are characterized by their persistence,potent toxicity,and capability for long-range dispersion,emphasizing the importance of their eradication to mitigate environmental *** conventional methods for removing chlorinated organic pollutants encompass advanced oxidation,catalytic oxidation,and bioremediation,the utilization of biochar has emerged as a prominent green and efficacious method in recent *** we review biochar's role in remediating typical chlorinated organics,including polychlorinated biphenyls(PCBs),triclosan(TCS),trichloroethene(TCE),tetrachloroethylene(PCE),organochlorine pesticides(OCPs),and chlorobenzenes(CBs).We focus on the impact of biochar material properties on the adsorption mechanisms of chlorinated *** review highlights the use of biochar as a sustainable and eco-friendly method for removing chlorinated organic pollutants,especially when combined with biological or chemical *** facilitates electron transfer efficiency between microorganisms,promoting the growth of dechlorinating bacteria and mitigating the toxicity of chlorinated organics through ***,biochar can activate processes such as advanced oxidation or nano zero-valent iron,generating free radicals to decompose chlorinated organic *** observe a broader application of biochar and bioprocesses for treating chlorinated organic pollutants in soil,reducing environmental ***,for water-based pollutants,integrating biochar with chemical methods proved more effective,leading to superior purification *** review contributes to the theoretical and practical application of biochar for removing environmental chlorinated organic pollutants.

关键词： Biochar Chlorinated organic pollutants Polychlorinated biphenyls Triclosan Trichloroethene

Remarks on Vanishing Viscosity Limits for the 3D Navier-Stokes Equations with a Slip Boundary Condition

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

Chinese Annals of Mathematics,Series B 2011年第3期32卷 321-332页

作者： Yuelong XIAO1 Zhouping XIN2.1institute for Computational and Applied Mathematics,Xiangtan university,Xiangtan 411105,Hunan,{2. The institute of Mathematical Sciences,The Chinese university of hong kong,hong kong,{2..2.he institute of Mathematical Sciences,The Chinese university of hong kong,hong kong,{2.. The institute of Mathematical Sciences The Chinese University of Hong Kong Hong Kong China

The authors study vanishing viscosity limits of solutions to the 3-dimensional incompressible Navier-Stokes system in general smooth domains with curved boundaries for a class of slip boundary conditions. In contrast to the case of flat boundaries, where the uniform convergence in super-norm can be obtained, the asymptotic behavior of viscous solutions for small viscosity depends on the curvature of the boundary in general. It is shown, in particular, that the viscous solution converges to that of the ideal Euler equations in C（[0, T]; HI（Ω）） provided that the initial vorticity vanishes on the boundary of the domain.

关键词： Poincare inequality Sobolev spaces with variable exponent

Prominent removal of trace lead(Ⅱ)ions from polluted water by terephthalic acid reformed Al/Zn metal organic nanoflakes

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第1期84卷 81-88页

作者： Junhua Li Lingshu Gao Junmao hong Xiaofeng Shi Sifang kong Jingyu Wang Hassan Algadi Benbin Xu Zhanhu Guo School of Chemistry and Chemical Engineering North University of ChinaTaiyuan030051China School of Traffic&Environment Shenzhen Institute of Information TechnologyShenzhen518172China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran11001Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon TyneNE18STUK

Terephthalic acid reformed Al/Zn metal organic nanoflake was prepared and functionalized with trie-thylamine(T-AlZn).Without adding terephthalic acid,there was no product of metal organic nanoflake.T-AlZn has a remarkable performance in removing trace lead(Ⅱ)ions(Pb^(2.)).The adsorption equipoise with the removal rate≥97%was reached within 35 *** removal rates of T-AlZn for Pb^(2.)declined by only 16.73%after four *** adsorption of T-AlZn for Pb^(2.)follows the Langmuir isotherms model and pseudo-second-order dynamics *** utmost adsorption competence was calculated as 2.5.2. mg g^(-1).The T-AlZn adsorbent exhibits a bright prospect in the adsorption for Pb^(2.)and is a considerable candidate in the disposal of industrial sewage.

关键词： Metal organic complex Nanoflake Trace level Pb^(2.) Adsorption

“Treat-all”Strategy for Patients with Chronic Hepatitis B Virus Infection in china:Are We There Yet?

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

Journal of Clinical and Translational Hepatology 2024年第6期12卷 589-593页

作者： Mengyang Zhang Yuanyuan kong Xiaoqian Xu Yameng Sun Jidong Jia hong You Liver research Center Beijing Friendship HospitalCapital Medical UniversityBeijing Key Laboratory of Translational Medicine on Liver CirrhosisNational Clinical Research Center of Digestive DiseasesState Key Lab of Digestive HealthBeijingChina Clinical Epidemiology and EBM Unit Beijing Friendship HospitalCapital Medical UniversityBeijing Clinical Research InstituteBeijingChina

Chronic hepatitis B remains the primary cause of liver-related events in *** World Health Organization set a goal to eliminate viral hepatitis as a public health threat by ***,achieving this goal appears challenging due to the current low rates of diagnosis and ***“Treat-all”strategy,which proposes treating all patients with detectable hepatitis B virus(HBV)DNA or even all patients with positive HBsAg,has been suggested to simplify anti-HBV *** 2.2.,the Chinese Society of Hepatology and the Chinese Society of Infectious Diseases updated the guidelines for the prevention and treatment of chronic hepatitis B in china,expanding antiviral indications and simplifying the treatment *** to this latest guideline,nearly 95%of patients with detectable HBV DNA are eligible for antiviral *** review aimed to provide a detailed interpretation of the treatment indications outlined in the Chinese Guidelines for the Prevention and Treatment of Chronic Hepatitis B(version 2.2.)and to identify gaps in achieving the“Treat-all”strategy in china.

关键词： Chronic hepatitis B Antiviral therapy Treatment indication Expanding treatment Treatment rate “Treat-all”strategy

Determination of Young's modulus by nanoindentation

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

Science china(Technological Sciences) 2004年第4期47卷 398-408页

作者： MA Dejun1, Chung Wo Ong2. LIU Jianmin1 & HE Jiawen3 1. Surface Engineering research institute, CMES, Beijing 100072.{2. 2. Department of Applied Physics and Materials research Center, The hong kong Polytechnic university, hong kong,{2. 3. State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong university, Xian 710049,{2. 1. Surface Engineering research institute CMES 100072 Beijing China 2. Department of Applied Physics and Materials research Center The Hong Kong Polytechnic University Hong Kong China 3. State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University 710049 Xi’an China

A methodology for determining Youngs modulus of materials by non-ideally sharp indentation has been developed. According to the principle of the same area-to-depth ratio, a non-ideally pyramidal indenter like a Berkovich one can be approximated by a non-ideally conical indenter with a spherical cap at the tip. By applying dimensional and finite element analysis to the non-ideally conical indentation, a set of approximate one-to-one relationships between the ratio of nominal hardness/reduced Youngs modulus and the ratio of elastic work/total work, which correspond to different tip bluntness, have been revealed. The nominal hardness is defined as the maximum indentation load divided by the cross-section area of the conical indenter specified at the maximum indentation depth. As a consequence, Youngs modulus can be determined from a nanoindentation test only using the maximum indentation load and depth, and the work done during loading and unloading processes. The new method for determining Youngs modulus is referred to as pure energy method. The validity of the method was examined by performing indentation tests on five materials. The experimental results and the standard reference values are in good agreement, indicating that the proposed pure energy method is a promising substitution for the most widely used analysis models at present.

关键词： Young's modulus, nanoindentation, nominal hardness, indentation work.

Combined perturbation bounds:Ⅱ.Polar decompositions

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2007年第9期50卷 1339-1346页

作者： Wen LI~(1+) Wei-wei SUN~2.1 School of Mathematical Sciences,South china Normal university,Guangzhou 510631,{2. 2.Department of Mathematics,city university of hong kong,hong kong,{2. School of Mathematical Sciences South China Normal University Guangzhou China Department of Mathematics City University of Hong Kong Hong Kong China

In this paper,we study the perturbation bounds for the polar decomposition A=QH where Q is unitary and H is *** optimal (asymptotic) bounds obtained in previous works for the unitary factor,the Hermitian factor and singular values of A areσ_r^2.|ΔQ||_F^2.||ΔA||_F^2. 1/2.|ΔH||_F^2.||ΔA||_F^2.and ||Δ∑||_F^2.||ΔA||_F^2.respectively,where∑=diag(σ_1,σ_2....,σ_r,0,...,0) is the singular value matrix of A andσ_r denotes the smallest nonzero singular *** we present some new combined (asymptotic) perturbation boundsσ_r^2.|ΔQ||_F^2.1/2.|ΔH||_F^2.||ΔA||_F^2.andσ_r^2.|ΔQ||_F^2.||Δ∑||_F^2.||ΔA||_F^2.which are optimal for each *** corresponding absolute perturbation bounds are also given.

关键词： polar decomposition perturbation singular value

Effects of lanthanum and gadolinium on proliferation and differentiation of primary osteoblasts

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第5期17卷 618-623页

作者： Zhang Dawei , Zhang Jinchao , Chen Yao , Yang Mengsu and Yao Xinsheng (Department of Natural Products Chemistry, Shenyang Pharmaceutical university, Shenyang 110016, china Shenzhen {2. institute of city university of hong kong, Shenzhen 518057, china Department of Biology and Chemistry, city university of hong kong, china Department of Chemistry, College of Chemistry & Environmental Science, Hebei university, Baoding 071002. china Key Laboratory for {2. and Development of Traditional Chinese Medicine and Natural Medicine at Shenzhen, Shenzhen 518057, china) [a]Department of Natural Products Chemistry Shenyang Pharmaceutical University Shenyang China [b]Shenzhen research institute of {2. university of hong kong Shenzhen China [c]Department of Biology and Chemistry City University of Hong Kong China [d]Department of Chemistry College of Chemistry & Environmental Science Hebei University Baoding China [e]Key Laboratory for research and Development of Traditional Chinese Medicine and Natural Medicine at Shenzhen Shenzhen China

The effects of La3+ and Gd3+ on the proliferation, differentiation and adipogenic transdifferentiation of rat calvarial osteoblast-like cells (ROB cells) were evaluated by MTT method, measuring the activity of alkaline phosphatase (ALP) and Oil red O measurement. Both of La3+ and Gd3+ inhibited the proliferation of ROB cells at all concentrations (1×10-5, 1×10-6, 1×10-7, 1×10-8, 1×10-9 mol·L-1). La3+ at concentration of 1×10-5mol·L-1 significantly increased the alkaline phosphatase activity of ROB cells up to 3 folds (P<0.01). However, the effects reversed to inhibit at other concentrations. Gd played a negative role in the alkaline phosphatase activity. La3+ inhibited the adipogenic transdifferentiation of ROB cells at all concentrations in a dose-dependent way. However, Gd promoted the adipogenic transdifferentiation of ROB cells at 1×10 and 1×10 mol·L . These findings suggested that the effects of rare earth elements on the proliferation, differentiation and adipogenic transdifferentiation of ROB cells were dependent on their concentrations and species.

关键词： lanthanum gadolinium osteoblast-like cells proliferation differentiation transdifferentiation.

Towards a Methodology for Formal Design and Analysis of Agent Interaction Protocols ——An Investigation in Electronic Commerce

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural Sciences 2001年第Z1期6卷 126-139页

作者： Wei Jun 1,2., Cheung Shing Chi 1, Wang Xu 1 1. Department of Computer Science, hong kong {2. of Science and Technology, Clear Water Bay, Kowloon, hong kong, china 2. institute of Software, Chinese Academy of Science, Beijing 100080, Ch Department of Computer Science Hong Kong University of Science and Technology Kowloon Hong Kong China institute of Software Chinese Academy of Science Beijing China

Various extensions of UML have been developed to meet the challenges of designing modern software systems, such as agent based electronic commerce applications. Recent advances in model checking technology have led it to be introduced into the development of approaches and tools to check the correctness of electronic commerce protocols. This paper focuses on the research of a method that connects an extension of AUML to model checker SPIN/Promela for the specification and verification of agent interaction protocols (AIP) in electronic commerce. The method presented here allows us to combine the benefits of visual specification with the power of some static analysis and model checking. Some algorithms and rules are developed to permit all visual modeling constructs translated mechanically into some Promela models of AIP, as supported by the model checker SPIN. Moreover, a process is illustrated to guide the specification and verification of AIP. The method is demonstrated thoroughly using the e commerce protocol NetBill as an example.

关键词： agent UML interaction protocol software agent model checking formal specification electronic commerce protocol