检索结果-南通市图书馆

journal of Environmental Sciences 2016年第3期28卷 138-145页

作者： jing tong Youwei Wang Yuanan Lu Institute of TCM & Natural Products School of Pharmaceutical SciencesWuhan University Department of Public Health Sciences University of Hawaii at Manoa Global Health Center School of Public HealthWuhan University

To extend the current understanding of the mercury-mediated cytotoxic effect,five neural cell lines established from different animal species were comparatively analyzed using three different endpoint bioassays：thiazolyl blue tetrazolium bromide,3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyl tetrazolium bromide assay（MTT）,neutral red uptake assay（NRU）,and Coomassie blue assay（CB）.Following a 24-hr exposure to selected concentrations of mercury chloride（HgCl_2） and methylmercury（Ⅱ） chloride（MeHgCl）,the cytotoxic effect on test cells was characterized by comparing their 50%inhibition concentration（IC_（50）） *** results indicated that both these forms of mercury were toxic to all the neural cells,but at very different *** IC_（50）values of MeHgCl among these cell lines ranged from 1.15±0.22 to 10.31 ± 0.70 μmol/L while the IC_（50） values for HgCl_2 were much higher,ranging from 6.44 ± 0.36 to 160.97±19.63 μmol/L,indicating the more toxic nature of *** IC_（50） ratio between HgCl_2and MeHgCl ranged from 1.75 to 96.0,which confirms that organic mercury is much more toxic to these neural cells than inorganic *** these cell lines,HGST-BR and TriG44 derived from marine sea turtles showed a significantly high tolerance to HgCl_2 as compared to the three mammalian neural *** these neural cells,SK-N-SH represented the most sensitive cells to both chemical forms of mercury.

关键词： In vitro cytotoxicity Neural cell lines HgCl_2 MeHgCl

Structure and Photophysical Properties of an Upconversion Holmium-mercury Compound with a 2-D Layer-like Motif

在线全文

学校读者我要写书评

暂无评论

Chinese journal of Structural Chemistry 2021年第1期40卷 70-78,3页

作者： CHEN Wen-tong Institute of Applied Chemistry School of Chemistry and Chemical EngineeringJi’an Key Laboratory of Photoelectric Crystal Materials and DeviceHumic Acid Utilization Engineering Research Center of Jiangxi ProvinceJiangxi Province Key Laboratory of Coordination ChemistryJinggangshan UniversityJi’an 343009China Department of Ecological and Resources Engineering Fujian Key Laboratory of Eco-industrial Green TechnologyWuyi UniversityWuyishan 354300China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Using a hydrothermal reaction,a novel holmium-mercury compound{[Ho(IA)(HIA)_(2)(H2 O)_(2)]_(2-)(Hg_(3)Br_(8))}n(nHgBr_(2))·2 nNO_(3)(1,HIA is isonicotinc acid)was synthesized and its crystal structure was characterized by single-crystal X-ray *** 1 crystallizes in monoclinic system,space group P2/c with a=13.0647(6),b=9.4659(3),c=26.0832(14)Å,β=97.522(4)°,V=3197.9(2)Å^(3),C_(36)H_(36)Br_(10)Hg_(4)Ho_(2)N_(8)O_(22),M_(r)=2863.95,Z=2,D_(c)=2.974 g/cm^(3),μ(Mo Kα)=18.331 mm^(–1) and F(000)=*** displays a two-dimensional(2 D)layer-like structure.A solid-state photoluminescence experiment revealed that it shows upconversion green *** emission peaks should come from the ^(5)I_(8)→^(5)G_(6) and ^(5)S_(2)→^(5)I_(8) characteristic emission of the 4 f electrons of the Ho3+*** 1 has a CIE chromaticity coordinate(0.1774,0.526).A solid-state UV-visible diffuse reflectance spectrum unveiled that this compound has a wide optical band gap of 3.26 eV.

关键词： CIE holmium lanthanide photoluminescence upconversion

Studies of internal magnetic fluctuation in the HL-1M tokamak

在线全文

学校读者我要写书评

暂无评论

核聚变与等离子体物理 2005年第1期25卷 42-48页

作者： ZHENGYong-zhen DINGXuan-tong LIWen-zhong SouthwesternInstituteofPhysics Chengdu610041

The transport of runaway electrons in a hot plasma can be comparatively easily measured in steady state or perturbation experiments, which provide runaway electron diffusivity Dr. The diffusivity can be interpreted in terms of the magnetic fluctuation level. The runaway electron diffusion coefficient is determined by internal magnetic fluctuations. The internal magnetic fluctuations level （r/BT） is estimated to be about （2～4） ×10-4 in the HL-1M plasma. The results demonstrate the effectiveness of using runaway transport techniques for determining internal magnetic fluctuations. A profile of the magnetic fluctuation level in the HL-1M tokamak can be estimated from Dr.

关键词：内禀磁波动扩散系数热等离子体稳定性失控电子传输

Molecular reconstruction model based on structure oriented lumping and group contribution methods

在线全文

学校读者我要写书评

暂无评论

Chinese journal of Chemical Engineering 2018年第8期26卷 1677-1683页

作者： jincai Chen Zhou Fang tong Qiu Department of Chemical Engineering Tsinghua University

Molecular management is a promising technology to face challenges in the refining industry, such as more stringent requirements for product oil and heavier crude oil, and to maximize the value of every molecule in petroleum fractions. To achieve molecular management in refining processes, a novel model that is based on structure oriented lumping(SOL) and group contribution(GC) methods was proposed in this study. SOL method was applied to describe a petroleum fraction with structural increments, and GC method aimed to estimate molecular properties. The latter was achieved by associating rules between SOL structural increments and GC structures. A three-step reconstruction algorithm was developed to build a representative set of molecules from partial analytical data. First, structural distribution parameters were optimized with several properties. Then, a molecular library was created by using the optimized parameters. In the final step, maximum information entropy(MIE) method was applied to obtain a molecular fraction. Two industrial samples were used to validate the method, and the simulation results of the feedstock properties agreed well with the experimental data.

关键词： Molecular reconstruction Structure oriented lumping Group contribution Monte Carlo Maximum information entropy

Coordinating ecosystem service trade-offs to achieve win–win outcomes: A review of the approaches

在线全文

学校读者我要写书评

暂无评论

journal of Environmental Sciences 2019年第8期31卷 103-112页

作者： Hua Zheng Lijuan Wang tong Wu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences

Ecosystem service(ES) trade-offs have been broadly recognized and studied over the past decade. However, how to coordinate the relationships among ES trade-offs to achieve win–win outcomes remains a considerable challenge for decision makers. Here, we summarize the current approaches applied to minimize ES trade-offs for win–wins and analyze the trade-offs among different ESs and their drivers. Based on a systematic review of the literature from 2005 to 2018, we identified 170 potentially relevant articles, 47 of which were selected for the review,recording 70 actual or potential trade-offs. Analysis of these case studies showed that trade-off pairs between provisioning services and regulating services/biodiversity accounted for 80% of total pairs. Furthermore, more than half of the ES trade-offs were driven by land use/land cover changes. Harvest and resource demand, natural resource management, and policy instruments were also among the main drivers. Four approaches to coordinate ES trade-offs were identified, including ecosystem, landscape-scale, multi-objective optimization, and policy intervention(and other) approaches. Based on the above, we recommend a rigorous understanding of the roles of different stakeholders, spatial scales of management, trade-off dynamics, and integrated implementation of diverse approaches to coordinate ES trade-offs in order to better achieve win–win outcomes.

关键词： Ecosystem services Synergy Trade-offs Ecosystem management Win–wins

Enhance d thermal-assiste d photocatalytic CO_(2) reduction by RGO/H-CN two-dimensional heterojunction

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2024年第9期176卷 36-47页

作者： Yuhan Liu jing Shang tong Zhu SKL-ESPC and SEPKL-AERM College of Environmental Sciences and Engineeringand Center for Environment and SciencePeking UniversityBeijing 100871P.R.China

Carbon dioxide(CO_(2))can be reduced to high-value fuels using the photocatalysis(PC)technique,which holds immense potential for tackling environmental issues and energy *** construction of metalfree photocatalyst capable of utilizing infrared light to execute thermal-assisted photocatalysis(TPC)remains a *** this study,reduced graphene oxide(RGO)with full-spectrum absorption was used as a thermal-assisted photocatalyst in CO_(2) *** exhibited higher CO_(2) reduction efficiency under the visible and infrared irradiation than the sole visible ***-5(GO treated at 120℃ for 5 h)presented the highest defect density and C-OH/C-O-C content,leading to the best PC and TPC *** was further engineered with HCl protonated g-C_(3)N_(4)(H-CN) to obtain two-dimensional heterojunction RGO/H-CN,which demonstrated the S-scheme charge transfer *** to the synergistic effect of heterojunction and thermal assistance,RGO/H-CN exhibited better CO_(2) reduction efficiencies in both PC and TPC than *** largest yields of CO and CH4 were achieved in 15%RGO/*** research provides new insights for applying RGO as thermal-assisted heterojunction photocatalyst for efficient CO_(2) reduction.

关键词： CO_(2) reduction Thermal-assisted photocatalysis Heterojunction Reduced graphene oxide g-C_(3)N_(4)

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

鉴别肺孢子菌感染与定植的研究进展

基础医学与临床 2025年第1期45卷 116-120页

作者：李星辰童瑾重庆医科大学附属第二医院呼吸与危重症医学科重庆400072

耶氏肺孢子菌(Pj)是一种非典型的条件致病性真菌,Pj定植是肺孢子菌肺炎(PjP)的潜在危险因素,积极鉴别Pj定植或感染有利于合理指导抗生素使用。血清G试验结合分子检测技术、外周血CD4^(+)T水平以及通过转录组测序技术对滋养体和包囊独立... 详细信息

耶氏肺孢子菌(Pj)是一种非典型的条件致病性真菌,Pj定植是肺孢子菌肺炎(PjP)的潜在危险因素,积极鉴别Pj定植或感染有利于合理指导抗生素使用。血清G试验结合分子检测技术、外周血CD4^(+)T水平以及通过转录组测序技术对滋养体和包囊独立表征等方法在鉴别Pj定植与感染上虽有获益,但尚未建立统一标准。本文立足于Pj病原学、致病机制、PjP临床特征及诊断方法,通过阐述鉴别Pj感染与定植的进展,为临床诊疗提供更为客观全面的鉴别思路。

关键词：耶氏肺孢子菌肺孢子菌肺炎定植诊断鉴别诊断

工业建筑遗产再生——以长春拖拉机厂弹性改造设计为例

在线全文

学校读者我要写书评

暂无评论

华中建筑 2025年第1期43卷 75-79页

作者：王春晖吴彤吉林建筑大学建筑与规划学院

工业建筑遗产再生是当前城市可持续发展的重要议题之一,研究以长春拖拉机厂为例,通过实地调查,对其历史、建筑结构和显隐性文化价值进行了详细分析。研究设计阶段提出“纤维街区”的弹性改造理念,旨在平衡保护文化遗产和满足现代城市需... 详细信息

工业建筑遗产再生是当前城市可持续发展的重要议题之一,研究以长春拖拉机厂为例,通过实地调查,对其历史、建筑结构和显隐性文化价值进行了详细分析。研究设计阶段提出“纤维街区”的弹性改造理念,旨在平衡保护文化遗产和满足现代城市需求的挑战,以确保改造过程中的环保性和社会责任感。改造后,长春拖拉机厂不仅保留了其独特的历史面貌,还融入了现代功能,成为城市更新的亮点。研究对于未来的工业建筑遗产再生提供了有益的经验和启示。

关键词：工业建筑遗产再生设计长春拖拉机厂弹性改造

Material parameter modeling and solution technique using birth–death element for notched metallic panel repaired with bonded composite patch

在线全文

学校读者我要写书评

暂无评论

Chinese journal of Aeronautics 2014年第2期27卷 445-452页

作者： tong Lei Li Shiqiu Xiong junjiang School of Transportation Science and Engineering Beihang University

This paper seeks to outline a novel three-layer model and a new birth-dteath element solution technique to evaluate static strength of notched metallic panel repaired with bonded com- posite patch and to optimize material parameters. The higher order 3D, 8-node isotropic solid ele- ment and 8-node anisotropic layered solid element with three degrees of freedom per node are respectively implemented to model substrate panel, adhesive layer and composite patch to establish three-layer model of repaired panel. The new solving technique based on birth-death element is developed to allow solution of the stress pattern of repaired panel for identifying failure mode. The new model and its solution are used to model failure mode and residual strength of repaired panel, and the obtained results have a good agreement with the experimental findings. Finally, the influences of material parameter of adhesive layer and composite patch on the residual strength of repaired panel are investigated for optimizing material properties to meet operational and envi- ronmental constraints.

关键词： Birth-death elementBonding Bonding repair Composite patch Residual strength Three-layer model

An R(x)-orthonormal theory for the vibration performance of a non-smooth symmetric composite beam with complex interface

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2019年第1期35卷 228-241,I0007页

作者： Chein-Shan Liu Bo-tong Li College of Mechanics and Materials Hohai UniversityNanjing 210098China Center of Excellence for Ocean Engineering Department of Mechanical and Mechatronic EngineeringTaiwan Ocean UniversityKeelung 202-24China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

A composite beam is symmetric if both the material property and support are symmetric with respect to the middle point. In order to study the free vibration performance of the symmetric composite beams with different complex nonsmooth/discontinuous interfaces, we develop an R(x)-orthonormal theory, where R(x) is an integrable flexural rigidity function. The R(x)-orthonormal bases in the linear space of boundary functions are constructed, of which the second-order derivatives of the boundary functions are asked to be orthonormal with respect to the weight function R(x). When the vibration modes of the symmetric composite beam are expressed in terms of the R(x)-orthonormal bases we can derive an eigenvalue problem endowed with a special structure of the coefficient matrix A :=[aij ],aij= 0 if i + j is odd. Based on the special structure we can prove two new theorems, which indicate that the characteristic equation of A can be decomposed into the product of the characteristic equations of two sub-matrices with dimensions half lower. Hence, we can sequentially solve the natural frequencies in closed-form owing to the specialty of A. We use this powerful new theory to analyze the free vibration performance and the vibration modes of symmetric composite beams with three different interfaces.

关键词： Symmetric composite beams R(x)-orthogonality of second-order derivatives of boundary functions R(x)-orthonormal theory Non-smooth/discontinuous interface Sequentially closed-from natural frequencies