检索结果-南通市图书馆

Chinese Journal of Chemistry 2023年第11期41卷 1348-1354页

作者： Xin-Yi Zhang Kai-Li Tian Jie Liu Wittaya Ngeontae Ai-Juan Zhao Maxim V. Bermeshev Shi-Qing Wong Kaspars Traskovskis zhijian chen Xiang-Kui Ren School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin300350 China Department of Chemistry Faculty of ScienceKhon Kaen UniversityKhon Kaen40002 Thailand A.V.Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences Moscow119991 Russia Faculty of Materials Science and Applied Chemistry Riga Technical UniversityRigaLV-1048 Latvia Zhejiang Institute of Tianjin University NingboZhejiang315201 China

A novel polyurethane polymer containing perylene diimide(PDI)unit and aniline segment,denoted as PU-PDI,was designed and *** tensile property and photophysical characteristic were investigated using various experimental and theoretical *** is found that the elongation of PU-PDIs can reach more than 1000%,indicating good tensile ***,based on the photoinduced electron transfer mechanism,the aniline segments in polyurethane can quench the auto-fluorescence of PDI unit to a negligible value,which overcomes the intractable fluorescence drawbacks of conventional colour *** non-emissive characteristic,in combination with the good thermal stability and tensile property of PU-PDI,provides a feasible design strategy to fabricate optical filters with high display quality.

关键词： Perylene dimide Polyurethane Photoinduced electron transfer Fluorescence quenching Colour filter

Maximizing Function and Quality of Life of Patients with Glioblastoma after Surgical Resection: A Review of Current Literature

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

Journal of Cancer Therapy 2016年第12期7卷 857-888页

作者： Matthew Smith-Cohn zhijian chen David Peereboom Glen Stevens Department of Neurology Clinical Neurosciences Center University of Utah Salt Lake City UT USA Massey Cancer Center Virginia Commonwealth University Richmond VA USA Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center Cleveland Clinic Cleveland OH USA

After surgical resection, patients with glioblastoma require many aspects of care to maximize function and quality of life. Patients face a multitude of hurdles that require the expertise of a variety of specialists. ... 详细信息

关键词： Palliative Glioblastoma Steroids Seizure Rehabilitation Myopathy

A monolithic InGaP/GaAs HBT power amplifier for W-CDMA applications

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

Journal of Southeast University(English Edition) 2011年第2期27卷 132-135页

作者：黄继伟王志功廖英豪陈志坚方志坚东南大学射频与光电集成电路研究所南京210096 广州润芯信息技术有限公司广州510663

A monolithic microwave integrated circuit （MMIC） power amplifier （PA） is proposed. It adopts a new on-chip bias circuit, which not only avoids the instability of the direct current bias caused by the change in the power supply and temperature, but also compensates deviations caused by the increase in input power. The bias circuit is a current-mirror configuration, and the feedback circuit helps to maintain bias voltage at a constant level. The gain of the feedback circuit is improved by the addition of a non-inverting amplifier within the feedback circuit. A shunt capacitor at the base node of the active bias transistor enhances the linearity of the PA. The chip is fabricated in an InGaP/GaAs heterojunction bipolar transistor （HBT） process. Measured results exhibit a 26. 6-dBm output compression point, 33.6% power-added efficiency （PAE） and - 40.2 dBc adjacent channel power ratio （ACPR） for wide-band code division multiple access （W-CDMA） applications.

关键词： power amplifier wide-band code division multipleaccess(W-CDMA) heterojunction bipolar transistor (HBT) bias circuit gain compression

在线全文

学校读者我要写书评

暂无评论

大型群桩基础安全监测传感器选型优化

西南交通大学学报 2011年第2期46卷 247-251页

作者：唐勇陈志坚河海大学地球科学与工程学院江苏南京210098

为优化大型基础工程的传感器系统,合理选择传感器类型,建立了以传感器系统成本为目标函数,以表决系统可靠度为约束条件的多传感器选型优化模型,并用遗传算法求其最优解.为了考虑安装埋设环境对系统可靠度的影响,提出了环境因素折减因子... 详细信息

为优化大型基础工程的传感器系统,合理选择传感器类型,建立了以传感器系统成本为目标函数,以表决系统可靠度为约束条件的多传感器选型优化模型,并用遗传算法求其最优解.为了考虑安装埋设环境对系统可靠度的影响,提出了环境因素折减因子的概念,给出了它的确定方法,并用该因子对不同环境下传感器的可靠度进行修正.以苏通大桥群桩基础传感器系统设计为例,对该模型进行了验证.结果表明,运用该模型,在保证系统可靠度的前提下,能使系统成本降低9.1%.

关键词：表决系统选型优化遗传算法苏通大桥

在线全文

学校读者我要写书评

暂无评论

苏通大桥河床冲刷多尺度监测系统的构建

西南交通大学学报 2012年第1期47卷 63-67,77页

作者：陈志坚唐勇陈松河海大学地球科学与工程学院江苏南京210098

为了监测苏通长江公路大桥的河床冲刷深度,利用水深传感器建立了桥位区的小尺度监测系统,实现了群桩基础内部河床冲刷的实时监测,并引入网络覆盖模型,对传感器埋设位置进行了优化,解决了河床冲刷传感器位置的优化问题;利用多波束测深系... 详细信息

为了监测苏通长江公路大桥的河床冲刷深度,利用水深传感器建立了桥位区的小尺度监测系统,实现了群桩基础内部河床冲刷的实时监测,并引入网络覆盖模型,对传感器埋设位置进行了优化,解决了河床冲刷传感器位置的优化问题;利用多波束测深系统建立了整个河床防护区的大尺度冲刷监测系统,并对部分实测数据进行了分析.结果表明:所建立的河床冲刷多尺度监测系统能够实现河床冲刷深度的高精度监测,整个系统的监测精度可以达到dm级.

关键词：河床冲刷多尺度监测系统水深传感器多波束测深系统

基于气象参数的混凝土箱梁日照温度场仿真分析

在线全文

学校读者我要写书评

暂无评论

东南大学学报（自然科学版） 2012年第5期42卷 950-955页

作者：顾斌陈志坚陈欣迪河海大学土木与交通学院南京210098 河海大学地球科学与工程学院南京210098 河海大学港口海岸与近海工程学院南京210098

针对困扰工程设计的桥梁梯度温度问题,建立了基于气象参数并考虑实际桥址和桥梁走向的混凝土箱梁日照温度场有限元模型.以苏通大桥辅助航道桥为例,使用2008年7月2日至7月7日6天的实测温度和气象数据,验证了该模型的准确性,并分析了大气... 详细信息

针对困扰工程设计的桥梁梯度温度问题,建立了基于气象参数并考虑实际桥址和桥梁走向的混凝土箱梁日照温度场有限元模型.以苏通大桥辅助航道桥为例,使用2008年7月2日至7月7日6天的实测温度和气象数据,验证了该模型的准确性,并分析了大气日温差和日平均风速对混凝土箱梁梯度温度的影响.分析结果表明,日平均风速对混凝土箱梁的最大梯度温度影响较大,大气日温差则对其影响较小.从概率统计学角度计算分析了桥址气象参数50年一遇标准值条件下混凝土箱梁的日照温度场,提出可能出现的最大梯度温度为18.3℃,并将提出的梯度温度模式与各国规范的梯度温度模式进行比较.结果表明,在分析混凝土箱梁日照温度场时有必要考虑气象参数的影响,以获得适合当地桥梁的梯度温度模式.

关键词：太阳辐射梯度温度混凝土箱梁气象参数

Inhibiting NF-κB increases cholesterol efflux from THP-1 derived-foam cells treated with AngⅡ via up-regulating the expression of ATP-binding cassette transporter A1

在线全文

学校读者我要写书评

暂无评论

Journal of Nanjing Medical University 2008年第4期22卷 211-216页

作者： Kun Liu Yanfu Wang zhijian chen Yuhua Liao Xiang Gao Jian chen Hua Zhong University of Science and Technology Union Hospital Institute of Cardiology Wuhan430022 Hubei Province China

Objective： To study the role of nuclear factor-kappa B（NF- κB） in cholesterol efflux from THP-1 derived-foam cells treated with Angiotensin Ⅱ（Ang Ⅱ ）. Methods：Cultured THP-1 derived-foam cells were treated with Ang Ⅱ or preincubated with tosyl-phenylalanine chloromethyl-ketone（TPCK） NF- κB inhibitor. The levels of activated NF- κB in the cells were examined by sandwich ELISA, Cellular cholesterol content was studied by electron microscopy scanning and zymochemistry via fluorospectrophotometer and cholesterol effiux was detected by scintillation counting technique. ABCA1 mRNA and protein were quantified by RT-PCR and Western blotting. Results：Addition of TPCK to the cells before Ang Ⅱ stimulation attenuated the response of NF- κB p65 nuclear translocation induced by Ang Ⅱ and showed no peak in foam cells group and caused a reduction in cholesterol content and an increase in cholesterol efflux by 24.1%（P〈 0.05） and 41.1%（P〈 0.05） respectively, when compared with Ang Ⅱ group. In accordance, the ABCA1 mRNA and protein were increased by 30% and 19%（P 〈 0.05） respectively, when compared with Ang Ⅱ group. Conclusion：Ang Ⅱ can downregulate ABCA1 in THP-1 derived-foam cells via NF- K B, which leads to less cholesterol effiux and the increase of cholesterol content with the consequence of the promotion of atherosclerosis.

关键词： Angiotensin Ⅱ nuclear factor- kappa B ATP-binding cassette transporter A1 cholesterol effiux atherosclerosis

大尺寸混凝土箱梁日照温度场的实测与仿真分析

在线全文

学校读者我要写书评

暂无评论

中南大学学报（自然科学版） 2013年第3期44卷 1252-1261页

作者：顾斌陈志坚陈欣迪河海大学土木与交通学院江苏南京210098 河海大学地球科学与工程学院江苏南京210098 河海大学港口海岸与近海工程学院江苏南京210098

基于对苏通大桥辅助航道桥运营期温度数据的分析以及对不同尺寸箱梁的温度场的仿真计算,研究大尺寸箱梁温度场的分布特点及其影响,提出腹板温度梯度和底板温度梯度的修正方法。研究结果表明:大尺寸混凝土箱梁竖向温度分布特点为腹板温... 详细信息

基于对苏通大桥辅助航道桥运营期温度数据的分析以及对不同尺寸箱梁的温度场的仿真计算,研究大尺寸箱梁温度场的分布特点及其影响,提出腹板温度梯度和底板温度梯度的修正方法。研究结果表明:大尺寸混凝土箱梁竖向温度分布特点为腹板温度整体高于梗腋部位温度,而梗腋部位的温度又整体高于底板温度;计算大尺寸混凝土箱梁的温度效应时,由腹板温度和底板温度引起的竖向挠度曲率误差最高可达33.3%。腹板沿壁厚方向最大温度梯度可达9℃,当上部结构上下行分幅布置时,外侧腹板和内侧腹板有不可忽略的横向温差。

关键词：大尺寸混凝土箱梁温度分布温度梯度横向温差挠度曲率

降低加肋双层圆柱壳辐射噪声线谱的结构声学设计

在线全文

学校读者我要写书评

暂无评论

声学学报 2014年第5期39卷 613-623页

作者：夏齐强陈志坚海军装备研究院上海200235 海军工程大学舰船工程系武汉430033

为降低双层圆柱壳辐射噪声线谱,从控制内壳振动响应和衰减壳间振动传递率进行结构声学设计。采用机械阻抗理论分析了环肋圆柱壳模态响应控制机理;由环肋振动方程推导分析了环肋径向机械阻抗特性;基于阻抗失配、波形转换原理提出一种阻... 详细信息

为降低双层圆柱壳辐射噪声线谱,从控制内壳振动响应和衰减壳间振动传递率进行结构声学设计。采用机械阻抗理论分析了环肋圆柱壳模态响应控制机理;由环肋振动方程推导分析了环肋径向机械阻抗特性;基于阻抗失配、波形转换原理提出一种阻抗加强环肋,分析了振动波阻抑特性;利用阻尼减振技术,综合考虑肋板的刚度、阻尼特性,设计了金属橡胶层叠肋板;结合数值计算实例,分析了设计双层壳模型的声辐射性能。结果表明:设计的双层加肋圆柱壳结构能有效降低辐射噪声线谱,在分析频段内辐射声压线谱平均降低约6.6 dB。研究结果对研制低噪声水下航行器具有良好的工程价值和应用前景。

关键词：辐射噪声线谱环肋圆柱壳圆柱壳结构声学设计双层圆柱壳振动传递率机械阻抗阻抗特性

Dual-directional regulation of spinal cord injury and the gut microbiota

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第3期19卷 548-556页

作者： Yinjie Cui Jingyi Liu Xiao Lei Shuwen Liu Haixia chen zhijian Wei Hongru Li Yuan Yang chenguang Zheng Zhongzheng Li Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina School of Medical Technology Tianjin University of Traditional Chinese MedicineTianjinChina Research Center of Experimental Acupuncture Science Tianjin University of Traditional Chinese MedicineTianjinChina International Cooperation and Exchange Office Chengdu University of Traditional Chinese MedicineChengduSichuan ProvinceChina International Cooperation Base of Spinal Cord Injury Tianjin Key Laboratory of Spine and Spinal Cord InjuryDepartment of OrthopedicsTianjin Medical University General HospitalTianjinChina Department of Orthopedics Qilu Hospital of Shandong UniversityJinanShandong ProvinceChina

There is increasing evidence that the gut microbiota affects the incidence and progression of central nervous system diseases via the brain-gut *** spinal cord is a vital important part of the central nervous system;however,the underlying association between spinal cord injury and gut interactions remains *** studies suggest that patients with spinal cord injury frequently experience intestinal dysfunction and gut *** in the gut microbiota can cause disruption in the intestinal barrier and trigger neurogenic inflammatory responses which may impede recovery after spinal cord *** review summarizes existing clinical and basic research on the relationship between the gut microbiota and spinal cord *** research identified three key ***,the gut microbiota in patients with spinal cord injury presents a key characteristic and gut dysbiosis may profoundly influence multiple organs and systems in patients with spinal cord ***,following spinal cord injury,weakened intestinal peristalsis,prolonged intestinal transport time,and immune dysfunction of the intestine caused by abnormal autonomic nerve function,as well as frequent antibiotic treatment,may induce gut ***,the gut microbiota and associated metabolites may act on central neurons and affect recovery after spinal cord injury;cytokines and the Toll-like receptor ligand pathways have been identified as crucial mechanisms in the communication between the gut microbiota and central nervous *** microbiota transplantation,probiotics,dietary interventions,and other therapies have been shown to serve a neuroprotective role in spinal cord injury by modulating the gut *** targeting the gut microbiota or associated metabolites are a promising approach to promote functional recovery and improve the complications of spinal cord injury.

关键词： chemokines cytokines gut microbiota NLRP3 spinal cord injury Toll-like receptor ligand tryptophan