检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于表观光谱反演黄东海水体固有光学量研究

光谱学与光谱分析 2011年第5期31卷 1403-1408页

作者：张民伟董庆唐军武宋庆君数字地球重点实验室中国科学院对地观测与数字地球科学中心北京100101 遥感科学国家重点实验室中国科学院遥感应用研究所北京100101 国家海洋技术中心天津300112 国家卫星海洋应用中心北京100081

水色遥感反演算法中半分析模型的建立需要已知水体固有光学量,文章基于现场实测数据建立了由遥感反射率反演固有光学量模型。对2003年春季黄东海航次所测数据进行了介绍,详细阐述了遥感反射率、颗粒物后向散射和吸收系数的测量方法。基... 详细信息

水色遥感反演算法中半分析模型的建立需要已知水体固有光学量,文章基于现场实测数据建立了由遥感反射率反演固有光学量模型。对2003年春季黄东海航次所测数据进行了介绍,详细阐述了遥感反射率、颗粒物后向散射和吸收系数的测量方法。基于生物光学模型,利用单纯形优化算法由遥感反射率来反演水体固有光学量,并将反演结果与实测数据进行了比较,除水之外物质吸收系数的均方根相对误差小于33%,颗粒物后向散射系数则小于30%,对引起误差的原因进行分析表明,本研究方法能够为黄东海水体固有光学量的反演提供一条有效途径,为遥感数据应用于黄东海水体生物光学特性的研究提供一个参考模型。

关键词：固有光学量表观光学量水色遥感优化

Effect of warming yang and supplementing kidney moxibustion therapy on the NF-κB signaling pathway of vascular dementia rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Acupuncture-Moxibustion 2018年第1期28卷 44-49,I0006,I0007页

作者： Wanli ZHU Kun YANG Shengchao cai Ying WANG Xiaoge song Anhui University of Chinese Medidne Hefei 230038 Anhui Province China Second Affiliated Hospital of Anhui University of Chinese Medicine Hefei 230061 Anhui Province China Research Institute of Acupuncture-Moxibustion and Meridians-Collaterals Anhui University of Chinese Medicine Hefei 230038 Anhui Province China

Objective： To observe the effect of warming yang and supplementing kidney moxibustion therapy on the behavioristics and the expression levels of hippocampal IL-1β, TNF-α and NF-κB related genes and proteins of vascular dementia（VD） rats, and to explore the mechanism of warming yang and supplementing kidney moxibustion therapy in inhibiting VD inflammatory response. Methods Seventy-eight SD rats, except 10 rats as sham operation group（group A）, were established into VD models by applying the ischemia reperfusion method in bilateral common carotid arteries. 30 models were successful and were randomly divided into model group（group B）, moxibustion group（group C） and western medication group（group D）, with 10 rats in each group. After modeling, suspended moxibustion was conducted at ＂Dàzhuī（大椎GV 14）＂,＂Mìngmén（命门GV 4）＂ and ＂Guānyuán（关元CV 4）＂ of the rats in group C for15 min/time. The intervention was performed for once a day, and intervention for 4 consecutive weeks was needed. Intragastric administration with nimodipine（2 mgkg-1d-1） was carried out in the rats in group D for 4 consecutive weeks. Morris water maze test was adopted for behavioral test in the rats in each group. HE staining was conducted in order to observe the pathological changes. RT-qPCR method and Western blot method were used for detecting the expression levels of hippocampal IL-1β, TNF-αand NF-κB related genes and ***： After modeling, the Morris water maze escape latency of rats in operation groups was obviously longer than that in group A（P〈0.05）. According to HE staining results, the arrangement of neurons in group B was incompact, the cell membranes were undefined, the cytoplasm was heterogeneous, karyopyknosis was found, the amount of necrosis increased, and the number of inflammatory cells significantly increased. Compared with group B, the number of inflammatory cells significantly reduced in group C and group D, and the amount of neuron necrosis also reduced. After intervention, c

关键词： Moxibustion Vascular dementia rats Inflammatory response NF-κB signaling pathway Hippocampal

Surgical treatment for vascular anomalies and tracheoesophageal compression

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第8期125卷 1504-1507页

作者： BAI song LI Xiao-feng LIU cai-xia PENG Yun YUAN Feng GUO Jian song Zhen-jiang William M. Novick LI Zhong-zhi Cardiac Centre Beijing Children＇s Hospital Affiliated to CapitalMedical University Beijing 100045 China International Child Heart Foundation Memphis TN USA Department of Surgery and Pediatrics University of TennesseeHealth Sciences Center TN USA

Background Vascular rings are uncommon anomalies in which preferred strategies for diagnosis and management may vary among institutions. In this study, we reported our approach and a review of our 5-year experience. Methods From May 2006 to April 2011, 45 children （31 boys） with vascular rings underwent surgical repair at Beijing Children＇s Hospital. Nineteen patients （26%） had associated heart anomalies. Results There were two hospital deaths. At follow-up, 11 patients still had intermittent respiratory symptoms, but these symptoms had no effect on growth or physical activities. No patients required reoperation. Conclusions The rates of misdiagnosis and missed diagnosis of vascular rings are higher than those of other congenital heart diseases. A high index of clinical suspicion coupled with the use of computed tomography enables early diagnosis. Surgical repair can be performed successfully, although a number of patients will have persistent symptoms.

关键词： congenital heart defects " vascular rings " tracheal stenosis

在线全文

学校读者我要写书评

暂无评论

葡萄糖基聚膦腈水凝胶的制备

高分子学报 2008年第2期18卷 141-147页

作者：朴秀玉蔡晴金日光北京化工大学材料科学与工程学院可控化学反应教育部重点实验室北京100029

通过对葡萄糖的羟基引入保护基再与聚二氯磷腈反应后用强酸脱保护制得侧链含部分葡萄糖基的聚膦腈,然后测量聚合物与植物外源凝集素ConA混合溶液的透光率的变化来研究凝胶化过程.结果表明,在ConA的浓度相同的情况下,聚合物溶液的浓度越... 详细信息

通过对葡萄糖的羟基引入保护基再与聚二氯磷腈反应后用强酸脱保护制得侧链含部分葡萄糖基的聚膦腈,然后测量聚合物与植物外源凝集素ConA混合溶液的透光率的变化来研究凝胶化过程.结果表明,在ConA的浓度相同的情况下,聚合物溶液的浓度越大,越容易形成凝胶;第二取代基团的水溶性好,葡萄糖的侧基比例大,有益于凝胶的形成.

关键词：聚膦腈葡萄糖水凝胶,胰岛素

A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology of China 2007年第2期5卷 102-106页

作者： Si-Si Liu Yue Xiao qing-song Wen Shao-Qian Li National Key Lab of Communications University of Electronic Science and Technology of China （UESTC） Chengdu 610054 China

This paper investigates a peak to average power ratio （PAPR） reduction method in multicarrier code division multiple access （MC-CDMA） system. Variable code sets （VCS）, a spreading codes selection scheme, can improve the PAPR property of the MC-CDMA signals, but this technique requires an exhaustive search over the combinations of spreading code sets. It is observed that when the number of active users increases, the search complexity will increase exponentially. Based on this fact, we propose a low complexity VCS （LC-VCS） method to reduce the computational complexity. The basic idea of LC-VCS is to derive new signals using the relationship between candidature signals. Simulation results show that the proposed approach can reduce PAPR with lower comtational pucomplexity. In addition, it can be blindly received without any side information.

关键词： Low complexity variable code sets,multicarrier code division multiple access (MC-CDMA),peak to average power ratio variable code sets.

多羧基稻杆吸附剂的制备及其应用于染料处理的研究

在线全文

学校读者我要写书评

暂无评论

广州化工 2024年第15期52卷 28-31页

作者：林青雯陈碧丹夏体泽杨忠芳朱风鹃张刘宁颖罗才洁海南省检验检测研究院三亚分所海南三亚572000

稻杆经碱预处理后与乙二胺四乙酸二酐(EDTAD)反应,制备一种多羧基稻杆吸附剂,并运用于模拟染料废水处理。通过红外光谱及电镜对改性吸附剂表征,并探究不同预处理条件,吸附时间及染料浓度等对其吸附性能的影响。通过吸附亚甲基蓝(MB)实验... 详细信息

稻杆经碱预处理后与乙二胺四乙酸二酐(EDTAD)反应,制备一种多羧基稻杆吸附剂,并运用于模拟染料废水处理。通过红外光谱及电镜对改性吸附剂表征,并探究不同预处理条件,吸附时间及染料浓度等对其吸附性能的影响。通过吸附亚甲基蓝(MB)实验,制备的多羧基稻杆吸附剂与未经处理的稻杆相比,吸附MB效率得到明显提升。在循环使用5次后,其吸附和解吸MB性能稳定,吸附率维持在90.9%,解吸率为93.6%,表明在水处理方面具有潜在应用前景。

关键词：染料吸附稻杆乙二胺四乙酸二酐

在线全文

学校读者我要写书评

暂无评论

汾酒不同称谓的起源考证

晋阳学刊 2024年第2期 123-128页

作者：曹福臣宋彦延贺天平山西大学科学技术史研究所太原030006

作为汾酒的基本文化符号,汾酒称谓是研究三晋大地酿制工艺和酿造文化的重要组成部分。不同历史时期内汾酒有汾清酒、干和酒、羊羔酒、汾酒等称谓。文章通过史料佐证和逻辑推理重新审度汾清酒、干和酒、羊羔酒、汾酒及汾酒的其他近亲同... 详细信息

作为汾酒的基本文化符号,汾酒称谓是研究三晋大地酿制工艺和酿造文化的重要组成部分。不同历史时期内汾酒有汾清酒、干和酒、羊羔酒、汾酒等称谓。文章通过史料佐证和逻辑推理重新审度汾清酒、干和酒、羊羔酒、汾酒及汾酒的其他近亲同源酒之成名起源,规避了唯史料论缺乏逻辑推理和缺乏史料论证而简单猜想其成名起源的问题。研究表明,汾清酒并非起源于北魏的开国年550年而是应不晚于公元5世纪,为非蒸馏酒;干和酒为蒸馏酒的雏形,其名形成于坊间;羊羔酒成名起源最早可追溯至汉代而非现有研究指认的北宋,但现有羊羔酒的酿制技术源头确实起源于宋代;汾酒这一称谓形成于清代顺治至康熙年间而非明代,当时汾酒的部分酿制技艺已符合现代汾酒的酿制特点。

关键词：汾清酒干和酒羊羔酒汾酒

不锈钢管道焊接头的局部微观结构、硬度和机械性能

在线全文

学校读者我要写书评

暂无评论

核动力工程 2000年第3期21卷 270-277,284页

作者：赵永翔高庆蔡力勋西南交通大学机械工程研究所成都610031 西南交通大学应用力学研究所成都610031

完成了1Cr18Ni9Ti不锈钢管道对接焊接头母材、热影响区和焊缝金属三区域的局部微观结构、硬度和单调机械性能的详细试验研究。揭示了三区域存在明显差异 ,尤其是焊缝金属区的局部微观组织结构不均匀性和局部硬度、机械性能的分散性最大... 详细信息

完成了1Cr18Ni9Ti不锈钢管道对接焊接头母材、热影响区和焊缝金属三区域的局部微观结构、硬度和单调机械性能的详细试验研究。揭示了三区域存在明显差异 ,尤其是焊缝金属区的局部微观组织结构不均匀性和局部硬度、机械性能的分散性最大。说明了在结构分析中有必要考虑这种差异 ,并引入可靠性方法。此外 ,还揭示了由奥氏体基体富δ铁素体带状结构组成的柱状晶是焊缝金属的特征微观结构 ,相邻富δ铁素体带的距离(40μm)恰好是该区域低周疲劳短裂纹行为中微观结构短裂纹(MSC)阶段和物理短裂纹(PSC)阶段的分界点。

关键词： 1Cr18Ni9Ti不锈钢管道焊接头微观结构硬度

Endpoint forecasting on composite regeneration by coupling cerium-based additive and microwave for diesel particulate filter

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第8期23卷 2118-2128页

作者：鄂加强左青松刘海力李煜龚金科 College of Mechanical and Vehicle Engineering Hunan University Institute of New Energy and Energy-saving & Emission-reduction Technology Hunan University College of Mechanical Engineering Xiangtan University

Numerical simulation has been carried out to investigate the major factors affecting the time of composite regeneration due to coupling cerium-based additive and microwave for diesel particulate f3ilter(DPF). Effect on the composite regeneration time from various factors such as mass flow rate of exhaust gas, temperature of exhaust gas, oxygen concentration of exhaust gas, microwave power and amount of cerium-based additive are investigated. And a mathematical model based on fuzzy least squares support vector machines has been developed to forecast the endpoint of the composite regeneration. The results show that the relative error of endpoint forecasting model of composite regeneration is less than 3.5%, and the oxygen concentration of exhaust gas has the biggest effect on the endpoint of composite regeneration, followed by the mass flow rate of exhaust gas, the microwave power, the temperature of exhaust gas and the amount of cerium-based additive.

关键词： fuzzy least squares support vector machines diesel particulate filter composite regeneration endpoint forecasting