检索结果-南通市图书馆

Chemical Research in Chinese Universities 2008年第3期24卷 362-366页

作者： CHEN Da-wei SHI jin-e YAN ji-chang WANG yue-hong YAN Fu-cheng SHANG Shu-xia XUE jing College of Urban and Environmental Sciences Northeast Normal University Changchun 130024 P. R. China

Titania nanocrystals with different morphologies were prepared using the hydrothermal method via controlling the pH values of solution, the ratio of reactants, temperature, and time of the hydrothermal reaction. The experimental results showed that uniform rod-like titania particles with an average aspect ratio of 6：1 could be obtained under the conditions of pH=11, n（TBOT）：n（TEA）=1：2, hydrothermal treatment at 150 °C for 24 h. When pH〈10, spherical titania nanocrystals could be obtained; with increasing the pH value, the diameter became smaller. Finally, the smallest size of the particles could reach 7 nm. Nanocrystals with uniformly well-dispersed and perfect crystallographic form were obtained via the above method. Phenol was used as the degradation model for testing the photocatalytical activity of the titania nanocrystals with different morphologies.

关键词： TiO2 Hydrothermal synthesis Nanoparticle Anatase Phenol degradation

Microfluidic assembly of WO_(3)/MoS_(2)Z-scheme heterojunction as tandem photocatalyst for nitrobenzene hydrogenation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第2期42卷 484-494页

作者： Qing Wang Xuan-Xuan Cao Tao Liu Kang-jie Wu Juan Deng jing-Sheng Chen yue-ji Cai Meng-Qi Shen Chao Yu Wei-Kang Wang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212000China Department of Earth and Environmental Engineering Columbia UniversityNew YorkNY10027USA

Heterojunction-based photocatalyst plays an important role in the various heterogeneous catalyses.Z-scheme photocatalytic systems with two semiconductor materials are suitable for harvesting solar energy,while the advanced nanostructuring tools for the fabrication of Z-scheme heterojunction are ***,WO_(3)/MoS_(2)(W/M_(0.2))heterojunction composites were constructed in a microfluidic system with enhanced assembly efficiency,and the photocatalytic performance has been investigated using X-ray photoelectron spectroscopy(XPS),MottSchottky(M-S)analysis and gas chromatograph-mass spectrometer(GC-MS).In addition,in the reduction of nitrobenzene,the photogenerated hole(h^(+))oxidation of formic acid(HCOOH)provides the hydrogen source and the deposited Pd nanoparticles are enriched with photogenerated electrons for improving the transfer hydrogenation *** microfluidic-prepared tandem photocatalyst gives a meaningful guidance for the design and synthesis of heterojunction catalysts,which is promising for energy maximizing control systems.

关键词： Tandem catalysis Photocatalysis Microfluidics Heterojunctions

基于改进粒子群算法优化BP神经网络的西江水质预测研究

在线全文

学校读者我要写书评

暂无评论

水动力学研究与进展（A辑） 2020年第5期35卷 567-574页

作者：纪广月广东工商职业技术大学公共教学部广东肇庆526020

为了提高西江水质预测的精度,提出一种改进粒子群算法优化BP神经网络的水质预测模型。首先,为提高PSO算法的收敛速度并避免其陷入局部最优,PSO算法种群被划分为普通子群、优良子群和较差子群,提出一种云模型改进PSO惯性权重的云模型粒... 详细信息

为了提高西江水质预测的精度,提出一种改进粒子群算法优化BP神经网络的水质预测模型。首先,为提高PSO算法的收敛速度并避免其陷入局部最优,PSO算法种群被划分为普通子群、优良子群和较差子群,提出一种云模型改进PSO惯性权重的云模型粒子群算法;其次,针对BP神经网络存在收敛速度慢和局部最优的问题,运用云模型粒子群算法迭代寻优获取BP神经网络的最佳初始权值和阈值;再次,将影响地表水质等级的主要因素作为CPSO-BP的输入,水质等级作为CPSO-BP的输出,建立CPSO-BP的水质等级预测模型。以西江2011年-2018年的水质监测数据为研究对象,与PSO-BP、GA-BP、DE-BP和BP模型进行了对比,研究结果表明,CPSO-BP水质预测的精度最高,且具有更快的收敛速度。

关键词：粒子群算法云模型遗传算法 BP神经网络水质预测

在线全文

学校读者我要写书评

暂无评论

基于不确定性的故障预测方法综述

控制与决策 2014年第5期29卷 769-778页

作者：孙强岳继光同济大学电子与信息工程学院上海201804

故障预测是实现视情维修策略的基础.不确定性问题在故障预测中普遍存在,对此,总结了基于不确定性的故障预测方法的关键问题,并以不确定性属性的特点将现有故障预测方法分为基于随机性、模糊性、灰性及混合不确定性等4类.综述了各类方法... 详细信息

故障预测是实现视情维修策略的基础.不确定性问题在故障预测中普遍存在,对此,总结了基于不确定性的故障预测方法的关键问题,并以不确定性属性的特点将现有故障预测方法分为基于随机性、模糊性、灰性及混合不确定性等4类.综述了各类方法的研究现状与不足,并展望了基于不确定性的故障预测方法的发展趋势,探讨了基于区间不确定性的故障预测方法的可行性.

关键词：故障预测不确定性随机性模糊性灰性区间不确定性

在线全文

学校读者我要写书评

暂无评论

区间分析及其在控制理论中的应用

控制与决策 2006年第11期21卷 1201-1207页

作者：彭瑞岳继光同济大学控制科学与工程系上海200092

对区间分析理论及其在控制领域的应用进行了综述.首先简单阐述了区间分析的基本原理,包括区间计算、区间N ew ton法和区间全局优化方法等;然后对区间方法在参数与状态估计、鲁棒控制、智能理论等方面的应用研究成果进行了归纳和总结;最... 详细信息

对区间分析理论及其在控制领域的应用进行了综述.首先简单阐述了区间分析的基本原理,包括区间计算、区间N ew ton法和区间全局优化方法等;然后对区间方法在参数与状态估计、鲁棒控制、智能理论等方面的应用研究成果进行了归纳和总结;最后分析了区间方法在控制理论应用研究中所面临的主要问题,并展望了未来的研究方向.

关键词：区间分析参数估计鲁棒控制区间模糊集区间神经网络

Application of endoscopic submucosal dissection in duodenal space-occupying lesions

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第24期8卷 6296-6305页

作者： Xiao-Yu Li Kai-yue ji Juan-Juan Zheng Ying-jie Guo Cui-Ping Zhang Kun-Peng Zhang Yu-Hu Qu Department of Gastroenterology The Affiliated Hospital of Qingdao UniversityQingdao 266003Shandong ProvinceChina Endoscopy Center Shandong Qingdao SanatoriumQingdao 266000Shandong ProvinceChina

BACKGROUNDEndoscopic submucosal dissection (ESD) has been advocated by digestiveendoscopists because of its comparable therapeutic effect to surgery, reducedtrauma, faster recovery, and fewer complications. However, ESD for lesions of theduodenum is more challenging than those occurring at other levels of thegastrointestinal tract due to the thin intestinal wall of the duodenum, narrowintestinal space, rich peripheral blood flow, proximity to vital organs, and highrisks of critical adverse events including intraoperative and delayed bleeding andperforation. Because of the low prevalence of the disease and the high risks ofsevere adverse events, successful ESD for lesions of the duodenum has rarelybeen reported in recent *** To investigate the efficacy and safety of ESD in the treatment of duodenal *** Clinical data of 24 cases of duodenal lesions treated by ESD at the DigestiveEndoscopy Center of the Affiliated Hospital of Qingdao University from January2016 to December 2019 were retrospectively *** All of the 24 cases from 23 patients underwent ESD treatment for duodenal spaceoccupyinglesions under general anesthesia, including 15 male and 8 femalepatients, with a mean age of 58.5 (32.0-74.0) years. There were 12 lesions (50%) inthe duodenal bulb, 9 (37.5%) in the descending part, and 3 (12.5%) in the ball descending junction. The mean diameter of the lesion was 12.75 (range, 11-22)mm. Thirteen lesions originated from the mucosa, of which 4 were low-gradeintraepithelial neoplasia, 3 were hyperplastic polyps, 2 were chronic mucositis, 2were adenomatous hyperplasia, 1 was high-grade intraepithelial neoplasia, and 1was tubular adenoma. Eleven lesions were in the submucosa, including 5neuroendocrine neoplasms, 2 cases of ectopic pancreas, 1 stromal tumor, 1leiomyoma, 1 submucosal duodenal adenoma, and 1 case of submucosal lymphfollicular hyperplasia. The intraoperative perforation rate was 20.8% (5/24),including 4 submucosal

关键词： Endoscopic resection Submucosal dissection Space-occupying lesions Duodenal adenoma Duodenal lesions Complications

Chemical modification in mass *** double bond location of long-chain fatty acids:The mass spectra of 2-alkenyl substituted heterocycles

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

Acta Chimica Sinica(English Edition) 1988年第1期6卷 29-36页

作者： HUANG Zhi-Heng ZHANG ji-yue YU Qi-Tao Shanghai Institute of Materia Medica,Academia Sinica,Shanghai 200031 Shanghai Institute of Materia Medica Academia Sinica Shanghai 200031

A novel approach to double bond location in long-chain olefinic acids has been elaboratedby means of“remote functional group modification”.This method consists in converting the car-boxylic acid into corresponding 2-alkenyl substituted heterocycle followed by measuring its 70 eVelectron-impact mass *** inherited tendency of random migration of the double bondalong the aliphatic chain under electron impact is strongly suppressed by incorporating the terminalcarboxyl group into a *** derivatives thus prepared show more informative spectrawhich clearly indicate the site of unsaturation of the parent *** scale derivatizationof the olefinic acids,as exemplified by the model compound oleic acid,and a comparison of the spectraof the resulting heterocycles(3—10)as well as benzoxazole derivatives(3a—3d)of selected carboxylicacids is described in the present paper.

关键词： acid Chemical modification in mass spectrometry.1.The double bond location of long-chain fatty acids

3D defect detection of connectors based on structured light

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第2期17卷 107-111页

作者： ji yue CHEN Yang SONG Li-mei YANGYan-gang YANG Huai-dong Key Laboratory of Advanced Electrical Engineering and Energy Technology Tiangong UniversityTianjin 300387China School of Mechanical Engineering Tianjin University of Technology and EducationTianjin 300222China Department of Precision Instrument Tsinghua UniversityBeijing 100084China

In order to realize the rapid detection of three-dimensional defects of connectors, this paper proposes a method for detecting connector defects based on structured light. This method combines structured light with binocular stereo vision to obtain three-dimensional data for the connector. Point cloud registration is used to identify defects and decision trees are used to classify defects. The accuracy of the 3D reconstruction results in this paper is 0.01 mm, the registration accuracy of the point cloud reaches the sub-millimeter level, and the final defect classification accuracy is 94%. The experimental results prove the effectiveness of the proposed three-dimensional connector defect detection method in connector defect detection and classification.

关键词： defect connector light

Effect of endogenous insulin-like growth factor and stem cell factor on diabetic colonic dysmotility

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第21期19卷 3324-3331页

作者： Yun Wang Xin-Yu Xu Yu-Rong Tang Wei-Wei Yang Yu-Feng Yuan yue-ji Ning Yin-Juan Yu Lin Lin Department of Gastroenterology First Affiliated Hospital of Nanjing Medical University

AIM: To investigate whether the reduction of stem cell factor (SCF) is mediated by decreased endogenous insulin-like growth factor (IGF)-1 in diabetic rat colon smooth muscle. METHODS: Sixteen Sprague-Dawley rats were randomly divided into two groups: control group and streptozotocin-induced diabetic group. After 8 wk of streptozotocin administration, colonic motility function and contractility of circular muscle strips were measured. The expression of endogenous IGF-1 and SCF was tested in colonic tissues. Colonic smooth muscle cells were cultured from normal adult rats. IGF-1 siRNA transfection was used to investigate whether SCF expression was affected by endogenous IGF-1 expression in smooth muscle cells, and IGF-1 induced SCF expression effects were studied. The effect of high glucose on the expression of endogenous IGF-1 and SCF was also investigated. RESULTS: Diabetic rats showed prolonged colonic transit time (252 ± 16 min vs 168 ± 9 min, P < 0.01) and weakness of circular muscle contraction (0.81 ± 0.09 g vs 2.48 ± 0.23 g, P < 0.01) compared with the control group. Endogenous IGF-1 and SCF protein expression was significantly reduced in the diabetic colonic muscle tissues. IGF-1 and SCF mRNA expression also showed a paralleled reduction in diabetic rats. In the IGF-1 siRNA transfected smooth muscle cells, SCF mRNA and protein expression was significantly decreased. IGF-1 could induce SCF expression in a concentration and time-dependent manner, mainly through the extracellular-signal-regulated kinase 1/2 signal pathway. High glucose inhibited endogenous IGF-1 and SCF expression and the addition of IGF-1 to the medium reversed the SCF expression. CONCLUSION: Myopathy may resolve in colonic motility dysfunction in diabetic rats. Deficiency of endogenous IGF-1 in colonic smooth muscle cells leads to reduction of SCF expression.

关键词： Diabetes Gastrointestinal motility function Insulin-like growth factor-1 Stem cell factor Smooth muscle cell

Multifunctional sulfur-immobilizing GO/MXene aerogels for highly-stable and long-cycle-life lithium-sulfur batteries

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

Rare Metals 2023年第8期42卷 2577-2591页

作者： Wen-Hao Yang Zhi-Cong Ni Dan You ji-yue Hou Bing-Nan Deng Rong-Wei Huang Shi-Gang Sun jin-Bao Zhao Xue Li Yi-Yong Zhang Ying-jie Zhang Key Laboratory of Advanced Battery Materials of Yunnan Province College of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming oouuyocnina State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Lithium-sulfur batteries are a promising candidate for next-generation energy storage due to their high theoretical energy ***,S insulation and the lithium polysulfide intermediate’s shuttle effect greatly hinder its practical *** this paper,a three-dimensional porous graphene oxide(GO)/MXene(Ti_(3)C_(2)T_(x))(GM)aerogel is designed and applied to a lithium-sulfur battery to settle the problem *** this strategy,two-dimensional(2D)GO sheets and highly conductive MXene nanosheets are integrated to form a 3D porous aerogel structure,creating a 3D conductive network and large polar surfaces,which can simultaneously achieve fast Li-ion/electron transport,strong chemical anchoring sulfur,and promot redox reactions between poly ***,the cathode shows excellent sulfur utilization and cycle *** prepared GM electrode battery has been tested for nearly nine months at 0.1C,providing the high initial capacity of 1255.62 mAh·g^(-1)and maintaining615.7 mAh·g^(-1)after 450 cycles.

关键词： Lithium-sulfur battery Aerogel Graphene oxide(GO) Ti_(3)C_(2)T_(x) Multifunction