检索结果-南通市图书馆

Synthesis of CdS multipods from cadmium xanthate in ethylenediamine solution

在线全文

学校读者我要写书评

暂无评论

Particuology 2015年第2期13卷 45-52页

作者： Qiaofeng Han Jin Zhao Lei Wu junwu Zhu Xin Wang Key Laboratory for Soft Chemistry and Functional Materials Ministry of EducationNanjing University of Science and Technology

CdS nanocrystals of various shapes were synthesized by using cadmium ethyldithiocarbonatio （xanthate） as a single precursor under solvothermal condition. The reaction temperature, cadmium concentration, and solvents determine the CdS morphology. Multipodal CdS structures of different fractions of all particles were obtained at temperatures ranging from 100 to 180 ℃ with the corresponding precursor concentrations in ethylenediamine （EDA） solution. This approach is different from that reported in the literature, where EDA is regarded as a solvent favorable to the formation ofCdS nanorods instead of pods. Uniform CdS multipods were prepared at 160 ℃ with 1.0 g of cadmium xanthate. The formation of CdS multipods in EDA solution may be attributed to a synergistic effect between the reaction temperature and Cd concentration, i.e., thermodynamically and kinetically controlled growth of the CdS wurtzite （WZ） and zinc blende （ZB） phases, as confirmed by the structural characterization of the component CdS crys- tals. EDA and xanthate ligands act as co-assisted capping agents in the growth of CdS multipods. When using N,N-dimethylformamide （DMF） and ethylene glycol （EG） as solvents, the CdS appears as triangular particles and flower-like microspheres assembled by polyhedrons, respectively.

关键词： Nanostructurecl materials Chemical synthesis Microstructure Transmission electron microscopy

Experimental and analytical studies on multiple tuned mass dampers for seismic protection of porcelain electrical equipment

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2017年第4期16卷 803-813页

作者： Bai Wen Dai junwu Zhou Huimeng Yang Yongqiang Ning Xiaoqing Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration Harbin 150080China

Porcelain electrical equipment （PEE）, such as current transformers, is critical to power supply systems, but its seismic performance during past earthquakes has not been satisfactory. This paper studies the seismic performance of two typical types of PEE and proposes a damping method for PEE based on multiple tuned mass dampers （MTMD）. An MTMD damping device involving three mass units, named a triple tuned mass damper （TTMD）, is designed and manufactured. Through shake table tests and finite element analysis, the dynamic characteristics of the PEE are studied and the effectiveness of the MTMD damping method is verified. The adverse influence of MTMD redundant mass to damping efficiency is studied and relevant equations are derived. MTMD robustness is verified through adjusting TTMD control frequencies. The damping effectiveness of TTMD, when the peak ground acceleration far exceeds the design value, is studied. Both shake table tests and finite element analysis indicate that MTMD is effective and robust in attenuating PEE seismic responses. TTMD remains effective when the PGA far exceeds the design value and when control deviations are considered.

关键词： current transformer damping porcelain electrical equipment finite element analysis multiple tuned massdampers shake table test

基于皮层-基底神经节环路模型的经颅磁声电刺激对大鼠行为决策的影响

在线全文

学校读者我要写书评

暂无评论

电工技术学报 2024年第2期39卷 356-368页

作者：张帅由胜男党君武杜文静王磊省部共建电工装备可靠性与智能化国家重点实验室河北工业大学天津300130 河北工业大学河北省生物电磁与神经工程重点实验室(筹) 天津300130 天津市生物电工与智能健康重点实验室河北工业大学天津300130

经颅磁声电刺激(TMAES)是一种新型、无创、可改变不同脑区电活动的神经调控方法。前额叶皮层与基底神经节中各脑区相互影响,在行为决策中起着关键作用,然而目前涉及其调节机理的研究相对较少。前运动皮层神经元活性和前额叶皮层突触可... 详细信息

经颅磁声电刺激(TMAES)是一种新型、无创、可改变不同脑区电活动的神经调控方法。前额叶皮层与基底神经节中各脑区相互影响,在行为决策中起着关键作用,然而目前涉及其调节机理的研究相对较少。前运动皮层神经元活性和前额叶皮层突触可塑性与行为决策关系密切。该文基于皮层-基底神经节回路模型,模拟分别对健康大鼠、帕金森大鼠施加刺激后,不同脑区在奖赏选择任务中的神经活动,仿真分析不同感应电流强度对皮层神经元放电率和脑区间突触权重的影响。并通过行为学实验进一步探讨经颅磁声电刺激对健康大鼠与帕金森模型大鼠行为决策的影响。仿真结果显示,对健康大鼠施加刺激可提高前额叶皮层与纹状体、前运动皮层之间的突触权重;对帕金森大鼠施加刺激可提高前运动皮层神经元放电率,调节前额叶皮层与纹状体、前运动皮层之间的突触权重。实验结果显示,施加刺激后,大鼠的学习探索能力和空间记忆能力均得到了提高,且帕金森模型大鼠受刺激的作用效果更显著。研究结果表明,经颅磁声电刺激可提高大鼠的运动积极性和学习效率,且有助于改善基底神经节的功能失衡。研究结果为进一步探索经颅磁声电刺激调节决策认知功能的作用机制奠定基础。

关键词：经颅磁声电刺激皮层神经元基底神经节行为决策突触权重

Performance Limit Evaluation Strategy for Automated Driving Systems

在线全文

学校读者我要写书评

暂无评论

Automotive Innovation 2022年第1期5卷 79-90页

作者： Feng Gao Jianwei Mu Xiangyu Han Yiheng Yang junwu Zhou State Key Laboratory of Vehicle NVH and Safety Technology ChongqingChina College of Mechanical and Vehicle Engineering Chongqing UniversityChongqingChina Passenger Vehicle Technical Center Dongfeng Liuzhou Motor Co.LtdLiuzhouChina

Efficient detection of performance limits is critical to autonomous *** autonomous driving is difficult to be realized under complicated scenarios,an improved genetic algorithm-based evolution test is proposed to accelerate the evaluation of performance *** conducts crossover operation at all positions and mutation several times to make the high-quality chromosome exist in candidate offspring *** the normal offspring is selected statistically based on the scenario com-plexity,which is designed to measure the difficulty of realizing autonomous driving through the Analytic Hierarchy *** benefits of modified cross/mutation operators on the improvement of scenario complexity are analyzed ***,the effectiveness of improved genetic algorithm-based evolution test is validated after being applied to evaluate the collision avoidance performance of an automatic parallel parking system.

关键词： Autonomous driving Test and evaluation Evolution test Genetic algorithm

Finite element analysis of an all-steel buckling-restrained brace

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

Earthquake Engineering and Engineering Vibration 2022年第4期21卷 1119-1135页

作者： Jiang Tao Dai junwu Yang Yongqiang Bai Wen Pang Hui Liu Rongheng Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChinaEarthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China

Typical all-steel buckling-restrained braces(BRBs)usually exhibit obvious local buckling,which is attributed to the lack of longitudinal restraint to the rectangle core *** address this issue,all-steel BRBs are proposed,in which two T-shaped steel plates are adopted as the minor restraint elements to restrain the core plate instead of infilled concrete or *** order to investigate the factors that characterize the hysterical responses of this device,different finite element(FE)models are developed for the specific *** FE models are developed based on nonlinear finite element software,which incorporate continuum(shell or brick)elements,large displacement,and deformation *** these FE models,two different steel constitutive models are adopted to precisely reproduce the cyclic response of the BRB ***,comparisons between the numerical and experimental results are conducted to validate the effectiveness and accuracy of the robust FE *** agreements between experimental observations and numerical predictions demonstrate that the FE method could be utilized for in depth parametric ***,BRBs with detailed configurations can provide excellent hysteretic behavior and seismic performance through the optimal design process.

关键词： steel BRB T-shaped steel finite element model optimal design hysteretic behavior

Well-dispersed ultrafine nitrogen-doped TiO_2 with polyvinylpyrrolidone(PVP) acted as N-source and stabilizer for water splitting

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2016年第1期25卷 1-9页

作者： Tianyu Liu Wei Chen Xiaoheng Liu junwu Zhu Lude Lu Key Laboratory for Soft Chemistry and Functional Materials Nanjing University of Science and Technology Ministry of Education

In this paper, ultrafine nitrogen-doped TiO2 photocatalyst with enhanced photocatalytic water-splitting properties was successfully fabricated via a solvothermal method. Herein, polyvinylpyrrolidone（PVP） was used as both nitrogen source and stabilizer. The enhancement in water-splitting process can be attributed to the doping of element nitrogen, which could supply an intermediate energy level and promote the separation of photo-excited holes and electrons. Moreover, this paper provides a new application of high-molecular polymer to synthesize solar-driven water-splitting photocatalysts.

关键词： N-doped TiO2 Polyvinylpyrrolidone(PVP) Solar-light driven Water splitting

超薄游离腓动脉穿支皮神经营养血管皮瓣修复术治疗手部皮肤软组织缺损患者的效果

在线全文

学校读者我要写书评

暂无评论

中国民康医学 2024年第1期36卷 65-68页

作者：龚俊武闫纪涛刘东博漯河市第二人民医院显微外科河南漯河462000

目的:观察超薄游离腓动脉穿支皮神经营养血管皮瓣修复术治疗手部皮肤软组织缺损患者的效果。方法:回顾性分析2018年1月至2022年1月该院收治的80例手部皮肤软组织缺损患者的临床资料,按治疗方式不同将其分为对照组与研究组各40例。对照... 详细信息

目的:观察超薄游离腓动脉穿支皮神经营养血管皮瓣修复术治疗手部皮肤软组织缺损患者的效果。方法:回顾性分析2018年1月至2022年1月该院收治的80例手部皮肤软组织缺损患者的临床资料,按治疗方式不同将其分为对照组与研究组各40例。对照组采用常规腓动脉穿支皮瓣修复术治疗,观察组采用超薄游离腓动脉穿支皮神经营养血管皮瓣修复术治疗,比较两组手术前后疼痛程度[视觉模拟评分法(VAS)]评分、腕关节功能(腕关节Cooney评分)、术后炎性因子[C反应蛋白(CRP)、肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)]水平,以及疗效满意度、术后6个月感觉功能恢复情况、术后并发症发生率。结果:术后1、3、6个月,两组VAS评分均低于术前,且研究组低于对照组,差异有统计学意义(P0.05)。结论:超薄皮瓣腓动脉穿支皮瓣游离修复术治疗手部皮肤软组织缺损患者可提高腕关节功能评分和感觉功能,降低疼痛程度评分和炎性因子水平,其效果优于常规腓动脉穿支皮瓣修复术治疗。

关键词：手部皮肤软组织缺损超薄游离腓动脉穿支皮神经营养血管皮瓣修复术关节功能

改良血管套接法对断指再植患者断指血运及成活情况的影响

在线全文

学校读者我要写书评

暂无评论

中国医学工程 2024年第9期32卷 85-88页

作者：龚俊武闫纪涛刘东博漯河市第二人民医院显微外科河南漯河462000

目的分析改良血管套接法对断指再植患者断指血运及成活情况的影响。方法本次研究筛选漯河市第二人民医院2019年1月至2023年4月收治的断指再植患者作为研究对象,依照纳入、排除标准进行选例,共选取80例,将其纳入研究后回顾性分析相关临... 详细信息

目的分析改良血管套接法对断指再植患者断指血运及成活情况的影响。方法本次研究筛选漯河市第二人民医院2019年1月至2023年4月收治的断指再植患者作为研究对象,依照纳入、排除标准进行选例,共选取80例,将其纳入研究后回顾性分析相关临床资料,依据不同血管吻合方式进行组别的分配(血管断端吻合法组、改良血管套接法组),分组例数相等(各40例)。所有患者均接受断指再植手术治疗,但前者采用血管断端吻合法、后者采用改良血管套接法进行血管吻合。均观察至出院,随访3个月。对比两组相关指标。结果改良血管套接法组术后3 d的毛细血管充盈时间短于血管断端吻合法组,经皮氧分压高于血管断端吻合法组,断指微循环检测值低于血管断端吻合法组,血管断端吻合法组术后7 d的断指成活率为70.00%(28/40),改良血管套接法组为90.00%(36/40),改良血管套接法组更高(χ2=5.000,P<0.05);两组术后1个月、术后3个月的Carroll双上肢功能评定(UEFT)评分均升高,改良血管套接法组更高;术后3个月两组世界卫生组织生存质量测定量表(WHOQOL-100)各项生活质量评分相比于治疗前均升高,而改良血管套接法组均较血管断端吻合法组更高;两组随访期间并发症总发生率比较,改良血管套接法组低于血管断端吻合法组(P<0.05)。结论改良血管套接法可显著促进断指再植患者断指血运情况的恢复,改善其手指运动功能,提高断指再植成活率及生活质量,减少并发症的发生,有着较高的安全性。

关键词：断指再植改良血管套接法断指血运情况断指再植成活率

在线全文

学校读者我要写书评

暂无评论

吡嗪酰胺类似物的设计、合成及杀菌活性

高等学校化学学报 2024年第10期45卷 41-48页

作者：王刚梁爽单忠刚英君伍吕亮李斌杨辉斌沈阳中化农药化工研发有限公司新农药创制与开发国家重点实验室农药国家工程研究中心沈阳110021

以取代吡嗪酸和2-甲基-3-硝基苯酚为原料,经4步反应合成了16个吡嗪酰胺类似物(化合物1~16),其结构经核磁共振波谱(^(1)H NMR和^(13)C NMR)及高分辨质谱(HRMS)确证.杀菌活性测试结果表明,吡嗪酰胺类似物浓度为6.25 mg/L时对玉米锈病具有... 详细信息

以取代吡嗪酸和2-甲基-3-硝基苯酚为原料,经4步反应合成了16个吡嗪酰胺类似物(化合物1~16),其结构经核磁共振波谱(^(1)H NMR和^(13)C NMR)及高分辨质谱(HRMS)确证.杀菌活性测试结果表明,吡嗪酰胺类似物浓度为6.25 mg/L时对玉米锈病具有优异的杀菌活性,其中化合物4,5,7,8,15和16对玉米锈病的杀菌活性为100%.分子对接模拟结果显示,化合物16通过氢键与琥珀酸脱氢酶(SDH)的TRP-173相互作用,这可以解释化合物16与目标蛋白之间可能的作用机制.研究结果表明,化合物16是一种具有潜在前景的杀菌剂候选物,为进一步研究提供了参考.

关键词：吡嗪酰胺合成杀菌活性分子对接