检索结果-南通市图书馆

Analysis of Potential for HFC-23 Emission Reduction in China's Fluorine Chemical Industry

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2013年第4期4卷 260-266页

作者： liN Hui cui yong-li YANG li-Rong Foreign Economic Cooperation Ofce Ministry of Environmental Protection

China is one of the major producers of chlorodifluoromethane(HCFC-22)in the world.A large amount of fluoroform(HFC-23)is emitted during the production of *** factors of HFC-23 were calculated in accordance with the monitoring reports of eleven HFC-23 clean development mechanism(CDM)projects in China and the HFC-23emissions in 2000–2010 as well as that in 2011–2020 were estimated and projected,*** is expected that,by the end of 2020,emissions of HFC-23 in China will be as much as 230 Mt *** HCFC-22 producers voluntarily reduced HFC-23 emissions,it would contribute 3.2%–3.6%to the national CO2emission reduction target for 2020.

关键词： greenhouse gas HFC-23 potential for emission reduction

CONCENTRATION AND VELOCITY OF DEBRIS FLOWS

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2002年第3期17卷 233-243页

作者： Xiangjun FEI,Peng cui,yong li Tsinghua University Beijing 100084 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences & Ministry of Water Conservancy Chengdu 610041 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences & Mini

Debris flows in nature generally fall into three groups distinct in their grain composition: water-stone flow, or sub-viscous debris flow, dominated by coarse grains; muddy flow, dominated by fine grains; and viscous debris flow composed of grains in large range. liquid-phase velocity and sedimentary delivery resistance of sub-viscous debris flow have been discussed based on the composition characters of sub- and high-viscous debris flows. It is revealed that the presence of fine grains plays a vital role in affecting resistance and average velocity, particularly when the volume fraction of grains in the flow is relatively high, i.e. Sv > 0.45. Grain-size distribution of viscous debris flow is characterized by a bimodal curve, which explains the properties like high density and low resistance gradient of debris flows. A calculation formula is finally put forward, which has to some extent overcome locality limits and achieved a good agreement with the field observations of debris flows in Southwest China.

关键词： Sub-viscous debris flow Viscous debris flow Grain composition Concentration Velocity

川西崩坡积混合土循环荷载下非饱和动本构模型

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

岩土力学 2017年第8期38卷 2157-2166页

作者：崔凯李永奎西南交通大学土木工程学院四川成都610031

在川西地区,由砂砾石与黏土颗粒构成的混合土路基经常会发生沉降变形问题。对于交通荷载作用下土体中的累积变形,可通过建立循环荷载作用下的动本构模型进行描述。在边界面弹塑性理论的框架内,综合考虑崩坡积混合土非饱和状态和细颗粒... 详细信息

在川西地区,由砂砾石与黏土颗粒构成的混合土路基经常会发生沉降变形问题。对于交通荷载作用下土体中的累积变形,可通过建立循环荷载作用下的动本构模型进行描述。在边界面弹塑性理论的框架内,综合考虑崩坡积混合土非饱和状态和细颗粒含量两大主要影响因素,结合能比较真实描述非饱和土体湿陷性能的LC(loading-collapse)屈服曲线,同时基于可移动映射中心的映射准则,采用经典的修正剑桥模型作为塑性势方程,构建了混合土的非饱和动本构模型,其参数可通过拟合或常规试验获得。通过与试验结果进行对比,该模型不仅可以较好地反映非饱和混合土在静载和循环荷载下的力学特性,而且能够真实地预测土体在加、卸载过程中的滞回特性。其结果可为川西混合土路基沉降变形预测提供理论依据。

关键词：非饱和土崩坡积混合土循环荷载细颗粒含量动本构模型

经济转轨背景下的道德话题变化——改革开放以来的经济与伦理关系

在线全文

学校读者我要写书评

暂无评论

湖南师范大学社会科学学报 2006年第6期35卷 39-44页

作者：李彬崔立勇湖南师范大学期刊社湖南长沙410081 中共山东省委党校政治系山东济南250021

我国的经济体制改革带来了巨大的经济关系变迁,其中的利益关系调整直接对道德关系的变化造成了冲击。在经济改革的不同历史阶段,在理论上对经济与伦理的关系也有不同层面的认识,在经济与道德的关系上,个人利益和个体道德的关系、制度建... 详细信息

我国的经济体制改革带来了巨大的经济关系变迁,其中的利益关系调整直接对道德关系的变化造成了冲击。在经济改革的不同历史阶段,在理论上对经济与伦理的关系也有不同层面的认识,在经济与道德的关系上,个人利益和个体道德的关系、制度建设与德性养成的关系形成了不同争论焦点。

关键词：经济改革经济与伦理道德建谩

在线全文

学校读者我要写书评

暂无评论

高强度锚杆用钢低速拉伸性能

天津大学学报（自然科学与工程技术版） 2004年第2期37卷 135-139页

作者：江利崔永丽中国矿业大学机电与材料工程学院徐州221008

煤炭开发深度的增加对巷道支护锚杆的强度提出了更高要求.作者研究了可用作煤巷高强度锚杆的热轧和调质20MnSi钢及0.63C 1.75Si 1.68Mn奥氏体贝氏体双相钢室温下的低速拉伸性能.当应变速率由4.6×10-4s-1降至4.6×10-6s-1时,热轧和调质... 详细信息

煤炭开发深度的增加对巷道支护锚杆的强度提出了更高要求.作者研究了可用作煤巷高强度锚杆的热轧和调质20MnSi钢及0.63C 1.75Si 1.68Mn奥氏体贝氏体双相钢室温下的低速拉伸性能.当应变速率由4.6×10-4s-1降至4.6×10-6s-1时,热轧和调质20MnSi钢的σ0.2分别降低约3.8%和1%,σb分别降低约3.3%和1%.当应变速率由4.6×10-3s-1降至4.6×10-6s-1时,奥贝钢的δ5由14%～15%提高到22%左右;σ0.2由1015MPa提高到1198MPa;σb由1448MPa提高到1546MPa;拉伸后残留奥氏体量减少.研究结果对于在岩石蠕变条件下工作的煤巷锚杆的设计和使用以及开发超高强度锚杆具有参考价值.

关键词：高强度锚杆拉伸性能低合金钢奥-贝双相钢低应变速率煤层巷道

Silencing phospholipid scramblase 1 expression by RNA interference in colorectal cancer and metastatic liver cancer

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2012年第4期11卷 393-400页

作者： Wei cui,Shi-yong li,Jun-Feng Du,Zi-Man Zhu and Ping An Department of General Surgery,General Surgery Center of the PLA,General Hospital of Beijing Military Command,Beijing 100700,China Department of Hepatobiliary Surgery,First Affiliated Hospital,General Hospital of the PLA,Beijing 100037,China Department of General Surgery General Surgery Center of the PLA General Hospital of Beijing Military Command Beijing 100700 China Department of Hepatobiliary Surgery First Affiliated Hospital General Hospital of the PLA Beijing 100037 China

BACKGROUND:Phospholipid scramblase 1(PLSCR1) not only participates in the transbilayer movement of phospholipids,but also plays a role in the pathogenesis and progression of *** present study aimed to evaluate the effect of silencing PLSCR1 expression by RNA interference in colorectal cancer(CRC) and metastatic liver ***:The expression of PLSCR1 in CRC and metastatic liver cancer samples was assessed by *** cultured cells with the highest expression were selected for subsequent *** designed three siRNA oligonucleotide segments targeted at *** transfection was *** biological behavior of the cells in proliferation,adhesion,migration and invasion was ***:PLSCR1 protein expression increased significantly in the majority of CRC and metastatic liver cancer samples compared with normal *** cells had the highest expression of *** siRNA-390 oligonucleotide segment had the best silencing *** transfection,Lovo cell proliferation was significantly inhibited compared with the controls in the MTT *** and fibronectin adhesion assays showed Lovo cell adhesion was also significantly *** the migration assay,the number of migrating cells in the PLSCR1 siRNA-390 group was 50±12,significantly lower than the number in the siRNA-N group(115±28) and in the control group(118±31).In an invasion test,the number of invading cells in the PLSCR1 siRNA-390 group was 60±18,significantly lower than that in the siRNA-N group(97±26) and the control group(103±24).CONCLUSIONS:PLSCR1 is overexpressed in CRC and metastatic liver *** of PLSCR1 by siRNA inhibits the proliferation,adhesion,migration and invasion of Lovo cells,which suggests that PLSCR1 contributes to the tumorigenesis and tumor progression of ***1 may be a potential gene therapy target for CRC and associated metastatic liver cancer.

关键词： phospholipid scramblase 1 colorectal cancer metastatic liver cancer RNA interference

Photo‑Energized MoS_(2)/CNT Cathode for High‑Performance li–CO_(2)Batteries in a Wide‑Temperature Range

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 160-175页

作者： Tingsong Hu Wenyi lian Kang Hu Qiuju li Xueliang cui Tengyu Yao Laifa Shen Jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

li–CO_(2) batteries are considered promising energy storage systems in extreme environments such as Mars;however,severe performance degradation will occur at a subzero temperature owning to the sluggish reaction ***,a photo-energized strategy adopting sustainable solar energy in wide working temperature range li–CO_(2) battery was achieved with a binder-free MoS_(2)/carbon nanotube(CNT)photo-electrode as *** unique layered structure and excellent photoelectric properties of MoS_(2) facilitate the abundant generation and rapid transfer of photo-excited carriers,which accelerate the CO_(2) reduction and li_(2)CO_(3) decomposition upon *** illuminated battery at room temperature exhibited high discharge voltage of 2.95 V and mitigated charge voltage of 3.27 V,attaining superior energy efficiency of 90.2%and excellent cycling stability of over 120 *** at an extremely low temperature of−30℃,the battery with same electrolyte can still deliver a small polarization of 0.45 V by the photoelectric and photothermal synergistic mechanism of MoS_(2)/CNT *** work demonstrates the promising potential of the photo-energized wide working temperature range li–CO_(2) battery in addressing the obstacle of charge overpotential and energy efficiency.

关键词： li-CO_(2)batteries Photo-energized Wide operation-temperature Kinetics MoS_(2)

血栓弹力图在发绀型复杂先天性心脏病患儿围术期的应用价值

在线全文

学校读者我要写书评

暂无评论

中国循环杂志 2012年第1期27卷 64-67页

作者：袁素崔勇丽北京协和医学院中国医学科学院阜外心血管病医院麻醉科北京市100037 北京协和医学院中国医学科学院阜外心血管病医院体外循环科北京市100037

目的:研究发绀型复杂先天性心脏病不同红细胞压积的患儿围术期凝血功能的变化。方法:36例发绀型复杂先天性心脏病患儿分为高红细胞压积组(红细胞压积≥54%,n=20)和低红细胞压积组(红细胞压积0.05)。注射鱼精蛋白后:高红细胞压积组比低... 详细信息

目的:研究发绀型复杂先天性心脏病不同红细胞压积的患儿围术期凝血功能的变化。方法:36例发绀型复杂先天性心脏病患儿分为高红细胞压积组(红细胞压积≥54%,n=20)和低红细胞压积组(红细胞压积0.05)。注射鱼精蛋白后:高红细胞压积组比低红细胞压积组MA:(41.7±4.0)mm比(46.7±2.9)mm、MAff:(6.0±1.9)mm比(10.1±1.7)mm明显降低,差异均有统计学意义(P均0.05)。手术后4 h:高红细胞压积组与低红细胞压积组比MA、MAff和MAp差异均无统计学意义(P均>0.05)。结论:根据血栓弹力图检测的结果,高红细胞压积的复杂先天性心脏病患儿术后应该给予血小板和纤维蛋白原,而低红细胞压积的患儿只给予血小板即可达到治疗目的。

关键词：发绀先天性心脏病红细胞压积体外循环凝血功能

Research on the balance optimization algorithm of image recognition accuracy and speed based on autocollimator measurement

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年第2期21卷 121-128页

作者： li Renpu MA Long cui Jiwen GUO Junqi Andrei KUliKOV WEN Dandan Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem Chongqing University of Post and Telecommunications School of Instrumentation Science and Engineering Harbin Institute of Technology Higher School of Engineering and Technology ITMO University

The autocollimator is an important device for achieving precise,small-angle,non-contact *** primarily obtains angular parameters of a plane target mirror indirectly by detecting the position of the imaging *** is limited report on the core algorithmic techniques in current commercial products and recent scientific *** paper addresses the performance requirements of coordinate reading accuracy and operational speed in autocollimator image *** proposes a cross-image center recognition scheme based on the Hough transform and another based on Zernike moments and the least squares *** experimental evaluation of the accuracy and speed of both schemes,the optimal image recognition scheme balancing measurement accuracy and speed for the autocollimator is *** these,the center recognition method based on Zernike moments and the least squares method offers higher measurement accuracy and stability,while the Hough transform-based method provides faster measurement speed.

关键词： Least squares approximations