检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2016年第7期23卷 850-857页

作者： Peng-cheng Lei xian-jiang shen Yang Li Min Guo Mei Zhang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

A simple and practical method for the synthesis of zeolite 4A from bauxite tailings is presented in this paper. Systematic investigations were carried out regarding the capacity of zeolite 4A to remove Cr（III） from aqueous solutions with relatively low initial concentrations of Cr（III）（5–100 mg·L^（-1））. It is found that the new method is extremely cost-effective and can significantly contribute in decreasing environmental pollution caused by the dumping of bauxite tailings. The Cr（III） removal capacity highly depends on the initial p H value and concentration of Cr（III） in the solution. The maximum removal capacity of Cr（III） was evaluated to be 85.1 mg×g^（-1） for zeolite 4A, measured at an initial p H value of 4 and an initial Cr（III） concentration of 5 mg·L^（-1）. This approach enables a higher removal capacity at lower concentrations of Cr（III）, which is a clear advantage over the chemical precipitation method. The removal mechanism of Cr（III） by zeolite 4A was examined. The results suggest that both ion exchange and the surface adsorption-crystallization reaction are critical steps. These two steps collectively resulted in the high removal capacity of zeolite 4A to remove Cr（III）.

关键词： bauxite tailings zeolite trivalent chromium wastewater treatment

在线全文

学校读者我要写书评

暂无评论

X射线累积剂量实时检测系统的研制

无损检测 2006年第2期28卷 68-69,80页

作者：姜先申韩焱中北大学电子信息工程系太原030051

介绍一种用于测量X射线累积剂量的实时检测系统,该系统采用有限积分法检测X射线剂量,并将测量数据快速传输给计算机进行处理。结果表明,该系统可快速准确地测量X射线相对剂量,输出信号动态范围较宽,测量相对误差较小,经标定后可测量射... 详细信息

介绍一种用于测量X射线累积剂量的实时检测系统,该系统采用有限积分法检测X射线剂量,并将测量数据快速传输给计算机进行处理。结果表明,该系统可快速准确地测量X射线相对剂量,输出信号动态范围较宽,测量相对误差较小,经标定后可测量射线的绝对剂量。

关键词：射线剂量实时检测探测器有限积分法

Role of the globus pallidus in motor and non-motor symptoms of Parkinson's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1628-1643页

作者： Yimiao jiang Zengxin Qi Huixian Zhu Kangli shen Ruiqi Liu Chenxin Fang Weiwei Lou Yifan jiang Wangrui Yuan Xin Cao Liang Chen Qianxing Zhuang Department of Physiology School of MedicineNantong UniversityNantongJiangsu ProvinceChina Department of Neurosurgery Huashan HospitalShanghai Medical CollegeFudan UniversityShanghaiChina National Center for Neurological Disorders ShanghaiChina Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration ShanghaiChina State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institute of Brain ScienceFudan UniversityShanghaiChina

The globus pallidus plays a pivotal role in the basal ganglia circuit. Parkinson's disease is characterized by degeneration of dopamine-producing cells in the substantia nigra, which leads to dopamine deficiency in the brain that subsequently manifests as various motor and non-motor symptoms. This review aims to summarize the involvement of the globus pallidus in both motor and non-motor manifestations of Parkinson's disease. The firing activities of parvalbumin neurons in the medial globus pallidus, including both the firing rate and pattern, exhibit strong correlations with the bradykinesia and rigidity associated with Parkinson's disease. Increased beta oscillations, which are highly correlated with bradykinesia and rigidity, are regulated by the lateral globus pallidus. Furthermore,bradykinesia and rigidity are strongly linked to the loss of dopaminergic projections within the cortical-basal ganglia-thalamocortical loop. Resting tremors are attributed to the transmission of pathological signals from the basal ganglia through the motor cortex to the cerebellum-ventral intermediate nucleus circuit. The cortico–striato–pallidal loop is responsible for mediating pallidi-associated sleep disorders. Medication and deep brain stimulation are the primary therapeutic strategies addressing the globus pallidus in Parkinson's disease. Medication is the primary treatment for motor symptoms in the early stages of Parkinson's disease, while deep brain stimulation has been clinically proven to be effective in alleviating symptoms in patients with advanced Parkinson's disease,particularly for the movement disorders caused by levodopa. Deep brain stimulation targeting the globus pallidus internus can improve motor function in patients with tremordominant and non-tremor-dominant Parkinson's disease, while deep brain stimulation targeting the globus pallidus externus can alter the temporal pattern of neural activity throughout the basal ganglia–thalamus network. Therefore, the comp

关键词： anxiety basal ganglia bradykinesia deep brain stimulation depression globus pallidus externus globus pallidus internus lateral globus pallidus medial globus pallidus neural circuit Parkinson's disease

Metal nanoparticles decorated CoFe-(oxy)hydroxysulfides nanosheets fabricated by a general strategy for electrocatalytic water splitting

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 26-38页

作者： Xiaodong Yang Haochen shen Xiaoming Xiao Zhichao Li Qi Zhou Wei Yang Bin jiang Yongli Sun Luhong Zhang Zhenhua Yan School of Chemical Engineering and Technology Tianjin University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

This study presents a novel method to fabricate metal-decorated,sulfur-doped layered double hydroxides （M/SLDH） through spontaneous redox and sulfurization *** developed Ag/SLDH and Pt/SLDH catalysts with abundant heterogeneous interfaces and hierarchical nanostructures demonstrated outstanding oxygen evolution reaction （OER） and hydrogen evolution reaction （HER） performance,achieving low overpotentials of 212 and 35 mV at 10 mA cm-2in 1 M KOH,*** both anode and cathode in water splitting,they required only 1.47 V to reach 10 mA cm-2and exhibited high structural robustness,maintaining stability at 1000 mA cm-2for 300 ***-situ Raman analysis revealed that the synergistic effects of metal nanoparticles and S doping significantly promote the transformation into the S-Co1-xFexOOH layer,which serves as the active phase for water ***,ultraviolet photoelectron spectroscopy （UPS） and density functional theory （DFT） analyses indicated that incorporating metal nanoparticles and S doping increase electron density near the Fermi level and reduce reaction energy barriers,thus enhancing intrinsic OER and HER *** study provides a scalable strategy for synthesizing high-performance electrocatalysts for water splitting,with promising potential for broader applications.

关键词： Ultraviolet photoelectron spectroscopy

PLGA/G5-T纳米纤维对重金属离子Hg^(2+)的吸附研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2017年第7期37卷 2036-2040页

作者：黄永兰姜献东沈仁杰李武松康爱红扬州工业职业技术学院江苏扬州225127 威海晨源分子新材料有限公司山东威海264211 扬州大学江苏扬州225127

在制革、冶金、电镀、采矿等行业发展过程中,含有重金属离子的废水进入河道和农田,重金属污染越来越受到人们的重视,治理和回收重金属也成为一个亟待解决的难题。其中重金属离子Hg^(2+)被认为是最毒的重金属。为了有效处理含重金属离子H... 详细信息

在制革、冶金、电镀、采矿等行业发展过程中,含有重金属离子的废水进入河道和农田,重金属污染越来越受到人们的重视,治理和回收重金属也成为一个亟待解决的难题。其中重金属离子Hg^(2+)被认为是最毒的重金属。为了有效处理含重金属离子Hg^(2+)的废水,将胸腺嘧啶(Thymine)修饰到第五代聚酰胺-胺树状大分子(***2)表面,得到G5-T,之后将G5-T与聚乳酸羟基乙酸(PLGA)混合并用静电纺丝方法得到PLGA/G5-T混纺纤维,并用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)等手段对PLGA/G5-T混纺纤维进行了表征,并以电感耦合等离子体发射光谱仪ICP-OES为检测手段,研究PLGA/G5-T对Hg^(2+)的吸附效果。FTIR结果表明,PLGA/G5-T纤维中3 320cm^(-1)处的氨基吸收峰比PLGA/G5上的弱,在1 660cm^(-1)处的酰胺基吸收峰比PLGA/G5强,说明***2与胸腺嘧啶^(-1)-乙酸成功反应。SEM结果表明,添加了G5-T混纺而得的PLGA/G5-T平均直径为(751±72)nm,纤维形貌均一,表面光滑无粘连,说明G5-T的加入没有破坏纤维的完整性。ICP-OES研究发现,PLGA/G5-T纤维膜对Hg^(2+)的脱除效率明显高于PLGA/G5纤维膜,胸腺嘧啶显著增强了PLGA/G5-T纤维膜对Hg^(2+)的脱除效率;对多种金属离子的吸附实验结果显示,PLGA/G5-T纤维膜对Cu2+,Cd2+和Co2+有微弱的吸附效果,但其对Hg^(2+)吸附效果显著,PLGA/G5-T纤维膜对水溶液中的Hg^(2+)有选择性吸收功能。研究为开发新型Hg^(2+)吸附剂提供了一种新方法。

关键词： PLGA G5.NH2 胸腺嘧啶傅里叶变换红外光谱汞离子

Localizing base stations with measured data:a concatenated image-based deep learning approach

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年

作者： Yang CHEN Ziyuan LIU Feng jiang Hong shen Wei XU Mengyu LI Ritao CHENG National Mobile Communications Research Laboratory Southeast University China Mobile Group Design Institute Co. Ltd.

Localization has become an indispensable function of modern cellular communication systems[1]. In a cloud radio access network （C-RAN）, the remote radio head （RRH） is the actual signal transmitter, whose location ...

关键词：

基于ARM核的嵌入式CPU内AHB接口的实现

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

通信学报 2002年第7期23卷 83-90页

作者：江先阳沈绪榜张天序华中科技大学图像识别与人工智能研究所图像信息处理与智能控制教育部重点实验室湖北武汉430074

本文分析了基于芯核的嵌入式CPU设计的特点,提出了设计基于ARM核的嵌入式CPU内AHB接口存在的空洞问题。结合体系的设计,给出了通过改进AHB总线解决这些空洞的方法。最后讨论了嵌入式CPU在硬件上对AHB接口的实现。

关键词： ARM核嵌入式CPU IC设计芯核 AHB总线

Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Yuan Tian jiang-Bo Chen Jie Ying Ge Tian Yu-Xuan Xiao Yi Lu Si-Ming Wu Wei Geng Ling shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering and Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-Sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction （OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion （Cl–） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline （1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

关键词：

Dynamical output feedback stabilization for neutral systems with mixed delays

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1043-1049页

作者： Wei QIAN Guo-jiang shen You-xian SUN State Key Lab of Industrtal Control Technology Zhejiang University Hangzhou 310027 China Department of Computer Science and Technology Henan Polytechnic University Jiaozuo 454000 China

This paper is concerned with the issue of stabilization for the linear neutral systems with mixed delays. The attention is focused on the design of output feedback controllers which guarantee the asymptotical stability of the closed-loop systems. Based on the model transformation of neutral type, the Lyapunov-Krasovskii functional method is employed to establish the delay-dependent stability criterion. Then, through the controller parameterization and some matrix transformation techniques, the desired parameters are determined under the delay-dependent design condition in terms of linear matrix inequalities (LMIs), and the desired controller is explicitly formulated. A numerical example is given to illustrate the effectiveness of the proposed method.

关键词： Neutral systems Mixed delays Output feedback stabilization Linear matrix inequality (LMI)

Mechanism of Ag and Al on improving the glass forming ability of CuZr-based alloys

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 424-429页

作者： Xiao-dong Ni Zheng Wang xiang Sun jiang shen Nan-xian Chen School of Applied Science University of Science and Technology Beijing Beijing 100083 China Department of Physics Tsinghua University Beijing 100084 China

By a mean field theoretical computation,the equilibrium distributions of additional Ag and Al in the crystalline phase of CuZr-based alloys were determined to occupy the two sublattices of the B2 structure *** the molecular dynamics technique,the effects of Ag and Al on the enthalpy difference（ΔH） between the supercooled melt and the crystalline phase were *** improved glass forming ability of Cu45Zr45Al10 and Cu45Zr45Ag10 can be attributed to their remarkably smaller ΔH than that of *** calculated diffusion coefficients are more sensitive to the atomic weight of the component atoms than to their interaction *** the component atom with the largest mass,the additional Ag increases the viscosity of the supercooled melt significantly and the experimentally stronger glass formation ability of Cu45Zr45Ag10 than Cu45Zr45Al10 can be well understood.

关键词： metallic glass ternary systems computer simulation glass forming ability atomistic simulation site occupancy