检索结果-南通市图书馆

BP neural network model on the forecast for blasting vibrating parameters in the course of hole-by-hole detonation

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2010年第3期16卷 249-255页

作者： DUAN Bao-fu li jun-meng ZHANG meng College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266510 China Civil Engineering Laboratory of Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266510 China

According to the neural network theory, combined with the technical characteristicsof the hole-by-hole detonation technology, a BP network model on the forecast forblasting vibration parameters was *** the deep hole stair demolition in a mine asan experimental object and using the raw information and the blasting vibration monitoringdata collected in the process of the hole-by-hole detonation, carried out some training andapplication work on the established BP network model through the Matlab software, andachieved good *** computed the vibration parameter with the empirical formulaand the BP network model *** comparing with the actual value, it is discoveredthat the forecasting result by the BP network model is close to the actual value.

关键词： blasting vibration BP neural network detonation hole-by-hole prediction model

Role of LM23 in cell proliferation and apoptosis and its expression during the testis development

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2013年第4期15卷 539-544,I0010页

作者： Qing liu Ya-Juan Song li-jun meng Fen Hu li-Xia Gou Chang-Hong Jia Hong-Mei Tang Wei Jie Wang Mi li Xiu-jun Zhang meng-Chun Jia College of life Sciences Hebei United University Tangshan 063000 China Department of Clinical Laboratory Handan Central Hospital Handan 056002 China Department of Environment & Chemical Engineering Tangshan College Tangshan 063000 China and Department of Reproductive Endocrinology National Research Institute for Family Planning Beijing 100081 China

LM23, a gene expressed specifically in the testis in a stage-specific manner, has a diverse range of functions that are important in both the life and death of spermatogenic cells. The aim of this study was to further investigate the expression of LM23 in the developing rat testis and the biological function of LM23 in proliferation and antiapoptosis in vitro. Semiquantitative reverse transcription （RT）-PCR and real-time PCR were used to examine the expression of LM23 in testis at different developmental stages. The results suggested that LM23 mRNA levels in the testis increased progressively after birth. The role of LM23 in proliferation was analyzed with cell counting kit-8 （CCK8）, colony-forming efficiency （CFE） and flow cytometry assays. The results indicated that ectopic expression of LM23 in 293T cells significantly promoted cell proliferation by increasing cell numbers in S phase. Several methods were used, including CCK8, annexin V and propidium iodide staining and western blotting, to determine the role of LM23 in apoptosis. The results showed that LM23 played a protective role in H202-induced apoptosis of 293T cells, mediated at least in part through the Akt/PI3K signal pathway. Taken together, these results provide new insights into the role of LM23 in the development of the testes andspermatogenesis.

关键词： apoptosis LM23 proliferation rat testis

Genetic Analysis of Cold Tolerance at Seedling Stage and Heat Tolerance at Anthesis in Rice (Oryza sativa L.)

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 Integrative Agriculture 2012年第3期11卷 359-367页

作者： CHENG li-rui WANG jun-min Veronica Uzokwe meng li-jun WANG Yun SUN Yong ZHU linghua XU Jian-long li Zhi-kang National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Zhejiang Academy of Agricultural Sciences Hangzhou 310021P.R.China International Rice Research Institute DAPO Box 7777Metro ManilaPhilippines

A set of 240 introgression lines derived from the advanced backcross population of a cross between a japonica cultivar,Xiushui 09,and an indica breeding line,IR2061,was developed to dissect QTLs affecting cold tolerance （CT） at seedling stage and heat tolerance （HT） at *** rate of seedlings （SRS） and spikelet fertility （SF）,the index traits of CT and HT,showed significant differences between the two parents under stresses.A total of four QTLs （qSRS1,qSRS7,qSRS11a and qSRS11b） for CT were identified on chromosomes 1,7,11,and the Xiushui 09 alleles increased SRS at all loci except *** QTLs for SF were identified on chromosomes 4,5,6,and *** QTLs could be classified into two major types based on their behaviors under normal and stress *** first was QTL expressed only under normal condition;and the second QTL was apparently stress induced and only expressed under *** them,two QTLs （qSF4 and qSF6） which reduced the trait difference between heat stress and normal conditions must have contributed to HT because of their obvious contribution to trait stability,and the IR2061 allele at the qSF6 and the Xiushui 09 allele at the qSF4 improved HT,*** similar QTL was found between CT at seedling stage and HT at ***,it is possible to breed a new variety with CT and HT by pyramiding the favorable CT-and HT-improved alleles at above loci from Xiushui 09 and IR2061,respectively,through marker-assisted selection （MAS）.

关键词： cold tolerance heat tolerance advanced backcross population QTL mapping rice

Degration of Partially Stabilized Zirconia Ceramics underan Applied Stress

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2003年第1期18卷 17-19页

作者：沈强 WuhanUniversityofTechnology

Partially stabilized zirconia ceramics were sintered using fine powder of ZrO 2 3mol%Y 2O 3 prepared by the chemical co precipitation *** tetragonal to monoclinic phase transformation in ZrO 2 ceramics during the aging in boiling water and the effect of an applied stress of 100MPa were mainly *** degradation of ZrO 2 ceramics is considered to be caused by the reaction between Y 2O 3 and H 2O,which leads to a decreasing in the stability of tetragonal phase of ZrO *** is found that the tensile stress improves the driving force of the phase transformation and accelerates the degradation while the compressive stress has no obvious effect on the degradation.

关键词： degradation partially stabilized zirconia applied stress

金属纳米球-纳米圆盘结构中表面等离激元共振模式的电磁场增强研究

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2022年第4期42卷 1098-1103页

作者：李梦君方晖唐山师范学院物理科学与技术学院河北唐山063000 深圳大学微纳光电子学研究院/纳米光子学研究中心深圳市微尺度光信息技术重点实验室广东深圳518060

表面等离激元自诞生以来已有一百多年的历史,并逐渐形成了一门新的学科——表面等离激元光子学。位于金属纳米结构中的局域表面等离激元可产生非常显著的近表面电场增强,并成功应用于诸多研究领域当中,而对局域表面等离激元与外界入射... 详细信息

表面等离激元自诞生以来已有一百多年的历史,并逐渐形成了一门新的学科——表面等离激元光子学。位于金属纳米结构中的局域表面等离激元可产生非常显著的近表面电场增强,并成功应用于诸多研究领域当中,而对局域表面等离激元与外界入射光中磁场的相互作用的研究则相对较少。该研究在前期已有的研究基础之上模拟计算了金属纳米球-纳米圆盘结构间隙处的近表面电、磁场增强,研究结果表明该结构在单束紧聚焦径向偏振光束的激发下,金属纳米圆盘产生局域表面等离激元呼吸模式和上下表面处的电偶极矩模式,该模式使圆盘中心纵向表面电场得到增强。由于金属纳米圆盘与金属纳米球的局域表面等离激元电偶极矩的耦合共振相互作用,可以形成纵向电场得到有效增强的局域表面等离激元共振间隙模式。通过数值模拟计算研究,证明该金属纳米结构间隙模式的纵向电场分量相对于径向偏振入射光的有效激发横向电场分量即近表面电场的增强因子高达250倍;而近表面磁场的增强因子高达170倍。为了更清晰地展现出这种新型金属纳米结构的光谱特性以及近表面电、磁场分布特征,还展示出了该金属纳米结构的近表面电场增强分布、近表面磁场振幅分布以及近表面电、磁场共振波长的对比分析,计算结果表明所提出的金属纳米球-纳米圆盘结构具有明显的局域近表面电、磁场增强优势以及较宽的频谱波段。由于本文提出的金属纳米结构具有电、磁场增强优势,希望计算结果能应用到更多的研究领域当中,尤其是生物医学等领域,为人们抗击疫情提供一点点参考和帮助。

关键词：微纳光学金属纳米球-纳米圆盘表面等离激元共振电磁场增强

在线全文

学校读者我要写书评

暂无评论

逐孔起爆震动参数预报的BP神经网络模型

爆炸与冲击 2010年第4期30卷 401-406页

作者：段宝福张猛李俊猛山东科技大学山东省土木工程防灾减灾重点实验室山东青岛266510

根据神经网络理论,结合逐孔起爆技术的特点,建立了爆破震动参数预报的BP网络模型。以某矿山深孔台阶爆破为例,利用逐孔起爆过程中收集的原始资料和爆破震动监测数据,对建立的BP网络模型进行了训练和应用。与实测值比较后发现,BP网络模... 详细信息

根据神经网络理论,结合逐孔起爆技术的特点,建立了爆破震动参数预报的BP网络模型。以某矿山深孔台阶爆破为例,利用逐孔起爆过程中收集的原始资料和爆破震动监测数据,对建立的BP网络模型进行了训练和应用。与实测值比较后发现,BP网络模型的预报结果更接近实测值。

关键词：爆炸力学预报模型 BP神经网络爆破震动逐孔起爆

Strategic Conception for Sustainable Development of Massive Freshwater Fish in China

在线全文

学校读者我要写书评

暂无评论

Animal Husbandry and Feed Science 2011年第6期3卷 1-4,41页

作者： YANG Pin-hong li meng-jun College of life Science Hunan University of Arts and Science Changde 415000 China Dahu Aquaculture Co. Ltd. Changde 415000China

[ Objective] To propose strategic conception for sustainable development of massive freshwater fish in China. [ Method] The current development status of massive freshwater fish industry in China was analyzed. On this basis, strategic conception for sustainable development of massive freshwater fish in China was proposed. [Remlt] In order to solve the present problems in the massive freshwater fish industry in China, basic strategies were proposed to develop the massive freshwater fish industry in China. The fishery resources should be capitalized to promote sustainable development of resources. Consumer demand of end-market should be used to drive stable development of the whole industry chain. Consumer demand should be guided to enhance the industrial market position. Processing and distribution channels should be constructed to promote sustainable development of seed and farming industries. Consumer demand at different levels should be used to promote multi-level multi-media health culture. Brand building and operating should be performed to enhance the competitive position of the industry in international and domestic markets. [ Condusion] The study has great theoretical and practical significance for promoting development of the massive freshwater fish industry in China.

关键词： Massive freshwater fish Strategy conception Sustainable development

安全协议逻辑程序不停机性快速预测的动态方法

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

计算机学报 2011年第7期34卷 1275-1283页

作者：周倜李梦君李舟军国防科学技术大学计算机学院长沙410073 北京航天飞行控制中心软件室北京100094 北京航空航天大学计算机学院北京100083

基于一般逻辑程序停机性刻画的动态方法,研究了解形式不动点不停机的一种动态刻画方法,给出了安全协议Horn逻辑扩展模型解形式不动点不停机性的一个充分条件.基于这个充分条件给出了一种不动点计算不终止的预测方法,该方法能够根据新产... 详细信息

基于一般逻辑程序停机性刻画的动态方法,研究了解形式不动点不停机的一种动态刻画方法,给出了安全协议Horn逻辑扩展模型解形式不动点不停机性的一个充分条件.基于这个充分条件给出了一种不动点计算不终止的预测方法,该方法能够根据新产生的解形式逻辑规则,预测不动点计算的不终止性,同时定位模型中导致解形式不动点无穷计算的解形式逻辑规则.解形式不动点不停机性的预测结果将作为选择精确验证方法或者抽象验证方法验证安全协议的基本依据.相关实验结果表明文中给出的预测算法是高效的.

关键词：安全协议验证不动点计算不停机性预测

CABYR RNAi plasmid construction and NF-κB signal transduction pathway

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第39期16卷 4980-4985页

作者： lin-Xiang Shi,Yao-Ming He,lin Fang,Hong-Bo meng,li-jun Zheng,Department of General Surgery,Shanghai Tenth People’s Hospital,Tongji University,Shanghai 200072,China Department of General Surgery Shanghai Tenth People's Hospital Tongji University Shanghai 200072 China. ajijinwei@***

AIM:To construct the CABYR RNAi plasmid and study its relation with the nuclear factor(NF)-κB signal transduction ***:Human CABYR mRNA sequence was obtained from *** structure of cDNA sequence for the short hairpin RNA was BbsⅠ+sense+loop+ antisense+transcription terminator+KpnⅠ+Bam HⅠ.A CABYR silencing plasmid was constructed and transfected into the human embryo cell line *** real-time polymerase chain reaction was used to analyze CABYR and NF-κB gene ***:The CABYR and NF-κB expressions were detected in 293T *** oligonucleotide(5'-GCT-CAGATGTTAGGTAAAG-3')efficiently silenced the expression of *** expression of NF-κB was not significantly affected by silencing CABYR(P=0.743).CONCLUSION:CABYR can be found in the human embryo cell line *** 2 can efficiently silence its target,CABYR,indicating that CABYR is not related with the NF-κB signal transduction pathway.

关键词： CABYR Plasmid Nuclear factor-κB Signal transduction RNAi Cabyrmid 2