检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

山东省工业污染排放趋势预测及影响因素分析

新疆师范大学学报（自然科学版） 2025年第1期44卷 18-25页

作者：朱文晶刘冠权唐勇青岛理工大学管理工程学院山东青岛266525 山东省高校智慧城市建设管理研究中心山东青岛266525

研究山东省工业污染排放的变化趋势和影响因素对促进工业绿色发展和环境保护具有重要意义。文章基于山东省2012—2021年的工业废水、工业SO_(2)排放量以及工业固体废物产生量的数据,采用灰色马尔可夫模型及灰色关联法对山东省工业污染... 详细信息

研究山东省工业污染排放的变化趋势和影响因素对促进工业绿色发展和环境保护具有重要意义。文章基于山东省2012—2021年的工业废水、工业SO_(2)排放量以及工业固体废物产生量的数据,采用灰色马尔可夫模型及灰色关联法对山东省工业污染排放的变化趋势以及影响因素进行分析。结果表明:(1)山东省工业废水和工业SO_(2)的排放量在未来五年内仍呈下降趋势,但工业固体废物的产生量呈缓慢增长态势;(2)各影响因素对山东省工业污染排放均有显著影响,其中产业结构和能源强度是影响工业废水及工业SO_(2)排放的主要因素,经济发展水平对工业固体废物产生量影响最大。基于研究结果,文章提出大力发展新能源、加大技术投入、重点关注工业固体废物的处理等建议。

关键词：工业污染灰色关联分析灰色马尔可夫模型趋势预测影响因素

同方期刊数据库

Chiral Recognition and Resolution Based on Helical Polymers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第12期39卷 1521-1527页

作者： Hui zou Qi-Liang Wu Li Zhou Xiao-Hua Hou Na Liu Zong-quan Wu Department of Polymer Science and Engineering School of Chemistry and Chemical EngineeringHefei University of Technology and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei 230009China

Helical polymers have attracted a great deal of attention and been extensively investigated due to their various *** of the most importa nt applicati ons of helical polymers is chiral recog nition and resolutio n ofe nan tiomersforthe reas on that a pair of e nan tiomers is comm only with differe nt physiological and toxicological behaviors in biological *** polymers usually prese nt un expected high chiral recogniti on ability to a variety of racemic compo *** more,the chiral recog nition and resolution abilities of the system are depe ndent on the highly ordered helical structures of the helical *** mini review mainly focuses on the recent progress in chiral recognition and resolution based on helical *** synthetic methodology for helical polymers is firstly discussed *** recent advances of chiral recog nition and resoluti on systems based on helical polymers,especially polyacetylenes and polyisocya nides,are *** hope this mini review will in spire more in terest in developing helical polymers and en courage further advances in chiral-related disciplines.

关键词： Helical polymer Chiral recog nition Chiral resolution Polyacetylenes Polyisocyanides

Solution of the Energy Level of Hydrogen-Like Atom for the Debye Shielding Potential

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第5期38卷 601-605页

作者： HU Xian-quan HU wen-Jiang MA Yong Department of Physics Chongqing Normal University Chongqing 400047 China Department of Electronic Information Engineering Chongqing University of Post and Telecommunications Chongqing 400065 China Department of Physics Chongqing Normal University Chongqing 400047 China

The first-order revision and the approximation analytical formula of the energy levels for hydrogen-likeatoms under the condition of Debye shielding potential are achieved by means of the Rayleigh-Schrodinger perturbationtheory; meanwhile, the corresponding recurrence relations are obtained from the use of the solution of power series. Basedon the above solutions and with the use of energy consistent method the equivalent value of second-order reversion underthe condition of Debye shielding potential is produced as well and the result is compared with the data obtained by thenumerical method. Besides, the critical bond-state and corresponding cut-off conditions are discussed.

关键词： Debye potential, recurrence relations, energy consistent method, hydrogen-like atoms, criticalbond-state

Gene and protein expression of proteinase-activated receptor-1, 2 in a murine model of acute graft vs host disease

维普期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2009年第3期3卷 309-315页

作者： quan LI Jian ZHANG Weiming LI Ping zou Institute of Hematology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of General Surgery Xiangfan Central HospitalXiangfan 441021China

Proteinase-activated receptors(PARs)are a novel subclass of seven transmembrane-spanning,G protein-coupled ***-1 and PAR-2 are widely expressed in a variety of cells and are found to be involved in many physiological and pathological processes includ-ing inﬂammation and immune ***,little is known about the function of PAR-1,2 in acute graft vs host disease(GVHD).In the present study,weﬁrst detected the expression of PAR-1,2 protein and mRNA in a murine model of acute GVHD using the methods of immunohis-tochemistry,Western blot and quantitative real-time polymerase chain reaction(PCR).Syngeneic hematopoie-tic stem cell transplantation(HSCT)mice served as *** relative gene expression level of PAR-1 was signiﬁcantly increased in the skin,liver,small intestine of allogeneic HSCT mice(in skin:0.039�0.013 vs 0.008�0.002 of controls,P=0.009;in liver:0.165�0.006 vs 0.017�0.006 of controls,P=0.004;in small intestine:0.215�0.009 vs 0.016�0.002 of con-trols,P=0.003),but not in the stomach,lung and kidney of allogeneic HSCT mice(P>0.05).PAR-2 mRNA expression in the liver and small intestine of allogeneic HSCT mice(in liver:0.010�0.002 vs 0.003�0.001 of controls,P=0.008;in small intestine:0.006�0.001 vs 0.003�0.001 of controls,P=0.024)was increased signiﬁcantly,but PAR-2 mRNA expression in the other organs(P>0.05)was not found to be signiﬁcantly ***-1,2 protein expression was in accordance with the mRNA expression,as shown by Western *** immunohistochemistry the present study demon-strated that there was strong PAR-1,2 immunoreactivity in the epithelial cell and vascular endothelial cell of target organs of acute ***ﬁndings of markedly increased expression of PAR-1,2 in target organs of acute GVHD suggest that PAR-1 and PAR-2 may play an important role in the pathogenesis of acute GVHD.

关键词： graft vs host disease proteinase-activated receptor murine model hematopoietic stem cell transplan-tation

Impact of travel speed on the microstructure and mechanical properties of adjustable-gap bobbin-tool friction stir welded Al–Mg joints

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

International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 710-717页

作者： Dong Wu wen-ya Li Yan-jun Gao Jun Yang quan wen Nektarios Vidakis Achillefs Vairis State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Travel TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China Capital Aerospace Machinery Company Beijing 100076China Department of Mechanical Engineering Hellenic Mediterranean UniversityHeraklionCrete 71004Greece

The butt welds of 4-mm thick 5A06 aluminum alloy plates were produced by adjustable-gap bobbin-tool friction stir travel with travel speeds of 200, 300, and 400 mm/min in this *** microstructure was studied using optical microscopy and electron backscatter diffraction(EBSD).Tensile tests and microhardness measurements were performed to identify the effect of the travel speed on the joint mechanical *** joints were obtained at 200 mm/min while voids were present at different positions of the joints as the travel speed *** EBSD results show that the grain size, high angle grain boundaries, and density of geometrically necessary dislocations in different regions of the joint vary depending on the recovery and recrystallization *** attention was given to the relationship between the local microstructure and mechanical *** measurements show that the average hardness of the stir zone(SZ) was greater than that of the base material, which was only affected slightly by the travel *** tensile strength of the joint decreased with increasing travel speed and the maximal strength efficiency reached 99%.

关键词： friction stir welding bobbin-tool aluminum alloy microstructure mechanical properties adjustable-gap

Rate-equation-based VCSEL thermal model and simulation

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第12期7卷 1968-1972页

作者： LIU Jie CHEN wen-lu LI Yu-quan Jiangnan Institute of Computing Technology Wuxi 214083 China Institute of Communications Engineering PLA Univ. of Sci. ＆ Tech.. Nanjing 210007 China

In this paper, we present a simple thermal model of Vertical-Cavity Surface-Emitting Laser （VCSEL） light-current （L1） characteristics based on the rate-equation. The model can be implemented in conventional SPICE-like circuit simulators, including HSPICE, and be used to simulate the key features of VCSEL. The results compare favorably with experimental data from a device reported in the literature. The simple empirical model is especially suitable for Computer Aided Design （CAD）, and greatly simplifies the design of optical communication systems.

关键词： Carrier leakage Vertical-Cavity Surface-Emitting Lasers (VCSELs) Rate-equation Thermal model SPICE simulation

Design,synthesis and antitumor activity of 3-substituted quinolone derivatives (Ⅰ)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第12期19卷 1395-1397页

作者： Hua Wang Qi Dong You Zhi Yu Li Yi quan zou Department of Medicinal Chemistry China Pharmaceutical University Nanjing 210009 China

A series of quinolone derivatives containing benzimidazole, benzoxazole or benzothiazole ring were synthesized. The cytotoxicity of 12 new compounds was evaluated in KB, Be17402, A2780 and HT-29 cell lines. Most of synthesized compounds showed moderate inhibitory activity against cancer cells. The inhibitory activities of 6k, against KB and A2780 tumor ceils are comparable to that of topotecan, one of topoisomerase I inhibitors.

关键词： Quinolone derivatives Synthesis Antitumor

Formation of the Fertilization Pore during Oogenesis of the Fern Ceratopteris thalictroides

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2010年第6期52卷 518-527页

作者： Jian-Guo Cao quan-Xi Wang wen-Mei Bao College of Life and Environment Sciences Shanghai Normal University Shanghai 200234 China

The development of the fertilization pore during oogenesis of the fern Ceratopteris thalictroides was followed using transmission electron microscopy. The newly formed egg is appressed closely to the adjacent cells. There are well-developed plasmodesmata between the egg and the ventral canal cell, but none between the egg and the jacket cells of the archegonium. During maturation, a separation cavity is formed around the egg. However, a pore region persistently connects the egg and the ventral canal cell. The extra egg membrane is formed by deposition of sheets of endoplasmic reticulum （ER）, but no ER is deposited on the inner surface of the pore region. Thus, a fertilization pore, covered by a layer of plasmalemma, is formed. The ventral canal cell undoubtedly participates the formation of the fertilization pore, probably by absorbing the sheets of ER beneath the pore region. The functional significance of the ventral canal cell in formation of the fertilization pore is discussed. The features of the mature egg include that abundant concentric membranes and osmiophilic vesicles occur in the cytoplasm of the mature egg. The initial, round nucleus of the egg eventually becomes cup-shaped. This investigation gives some new insights about the cells participating oogenesis in ferns.

关键词： FERTILIZATION of plants OOGENESIS CERATOPTERIS thalictroides TRANSMISSION electron microscopy PLASMODESMATA ENDOPLASMIC reticulum CELL membranes CELL interaction (Biology)

Nonparametric Regression with Interval-Censored Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第8期30卷 1422-1434页

作者： wen Li DENG Zu Kang ZHENG Ri quan ZHANG School of Mathematics and Information Science Jiangxi Normal University Department of Statistics School of ManagementFudan University Department of Statistics School of Finance and StatisticsEast China Normal University

In many medical studies,the prevalence of interval censored data is increasing due to periodic monitoring of the progression status of a *** nonparametric regression model,when the response variable is subjected to interval-censoring,the regression function could not be estimated by traditional methods *** the censored data,we construct a new response variable which has the same conditional expectation as the original *** on the new variable,we get a nearest neighbor estimator of the regression *** is established that the estimator has strong consistency and asymptotic *** relevant simulation reports are given.

关键词： Interval-censored data regression function nearest neighbor estimator