检索结果-南通市图书馆

Cochannel interference cancelation for multiple access systems

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2007年第2期18卷 223-228页

作者： Wang Xia Zhu shihua sun Delong School of Electronics and Information Engineering Xi'an Jiaotong Univ Xi'an 710049 P. R. China

Many properties of frequency-hopped spread-spectrum multiple access （FH/SSMA）, such as, robustness against frequency selective fading and jamming make it a preferred multiple access communication scheme. But cochannel interference （CCI） can seriously harm the system＇s performance. On the basis of the analysis of the CCI pattern of frequency hopped multiple access signal, a new multiuser detection algorithm for canceling the CCI in frequency hopped multiple access systems is proposed. In the proposed scheme, the CCI is canceled by first detecting the frequency hopping slot, and then classifying and regenerating the candidates of the interference pattern from the time-frequency matrix. Both the theoretical analysis and computer simulation results show that compared to the conventional detector and Mabuchi＇s detector, this new multiuser detector has lower complexity, better convergence stability, and is suitable for both additive white Gaussian noise （AWGN） channels and Rayleigh fading channels.

关键词： Communication and informance systems Cochannel interference cancellation Multiuser detection Frequency hopped.

Gapless Genome Assembly of ZH8015 and Preliminary Multi-Omics Analysis to Investigate ZH8015's Responses Against Brown Planthopper Infestation

在线全文

学校读者我要写书评

暂无评论

Rice science 2024年第3期31卷 317-327,I0042-I0045页

作者： LI Dian DUAN Wenjing LIU Qun’en WU Weixun ZHAN Xiaodeng sun Lianping ZHANG Yingxin CHENG shihua State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China

Accurate genomic information is essential for advancing genetic breeding research in specific rice *** study presented a gapless genome assembly of the indica rice cultivar Zhonghui 8015(ZH8015)using Pac Bio HiFi,Hi-C,and ONT(Oxford Nanopore Technologies)ultra-long sequencing technologies,annotating 43037 gene ***,utilizing this genome along with transcriptomic and metabolomic techniques,we explored ZH8015's response to brown planthopper(BPH)*** transcriptomic sampling indicated significant changes in gene expression levels around 48 h after BPH *** analysis revealed particularly significant alterations in genes related to reactive oxygen species scavenging and cell wall *** results demonstrated marked increases in levels of several monosaccharides,which are components of the cell wall and dramatic changes in flavonoid *** association analysis identified differentially expressed genes associated with key metabolites,shedding light on ZH8015's response to BPH *** summary,this study constructed a reliable genome sequence resource for ZH8015,and the preliminary multi-omics results will guide future insect-resistant breeding research.

关键词： brown planthopper gapless genome genome assembly multi-omics Nilaparvata lugens rice

Research on Testing Methods of Ⅰ-Ⅴ Characteristics of Solar Photovoltaic Cell Array

在线全文

学校读者我要写书评

暂无评论

Research on Testing Methods of Ⅰ-Ⅴ Characteristics of Sola...

大兴安岭南段东麓中生代O型埃达克质火山岩及其成因、古构造环境和找矿意义

The 2011 International Conference on Electric and Electronics (EEIC 2011)

作者： Yunhai Hou Ershuai Li shihua sun School of Electric ＆ Electric Engineering Changchun University of Technology

By testing the I-V characteristics of the solar photovoltaic cell array and referencing the experimental data, it can effectively evaluate the PV power plant control and design standards. In order to get the accurate test to the characteristics of solar photovoltaic cell array data, test its I-V characteristics, we use the dynamic capacitance charging test method, according to the characteristics of capacitors, take the dynamic capacitance as a solar PV array variable load, through the current and voltage sampling on the whole process of charging the capacitor for the photovoltaic cell array, then get I-V curve of PV array.

关键词： Solar photovoltaic cell array I-V characteristics Dynamic capacitance Sampling

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

岩石学报 2006年第9期22卷 2289-2304页

作者：张永北孙世华毛骞中国科学院地质与地球物理研究所矿物资源重点实验室

蒙东西拉禾伦河北侧查干木伦河流域,属中生代大兴安岭火山-侵入杂岩带南段。最近区内晚侏罗世满克头鄂博组陆相火山杂岩火山盾中,发现有埃达克质火山岩,与少量钠质流纹岩和玄武岩共生。埃达克岩 Al_2O_3>15%,MgO1,LREE 富集,HREE 及 LI... 详细信息

蒙东西拉禾伦河北侧查干木伦河流域,属中生代大兴安岭火山-侵入杂岩带南段。最近区内晚侏罗世满克头鄂博组陆相火山杂岩火山盾中,发现有埃达克质火山岩,与少量钠质流纹岩和玄武岩共生。埃达克岩 Al_2O_3>15%,MgO1,LREE 富集,HREE 及 LIRE 强烈亏损,无负铕异常,高 Sr(497.91～896.40×10^(-6)),低 Y(4.33～15.77<18×10^(-6)),低 Yb(0.35～1.54<1.9×10^(-6)),I_(Sr)=0.70374～0.70594,ε_(Nd)(t)为-0.45～+6.58,在 K-Na-Ca、Rb-Sr-Ba、Sr/Y-Y 和 Sr/Yb-Yb 等图中属埃达克岩,具奥长花岗岩演化趋势,是典型的 O 型埃达克岩。其与共生岩石ε_(Nd)(t)、I_(Sr)与晚古生代玄武岩的接近,部分岩石 t_(DM)(677～845Ma)与晚古生代俯冲洋壳(t_(DM)=627～998Ma)相同,Sr-Nd 同位素及Zr/Hf-Nb/Ta 比值具有亏损地幔与下地壳混合特征,另有岩石(t_(DM)=343～453Ma)源于古生代年轻地幔。据此推论其源岩是以晚元古代俯冲洋壳为主,多源物质混合的增生地体下地壳。La_N/Yb_N-Yb_N 及 La/Sm-La 图证明埃达质岩浆是榴辉岩化源岩部分熔融的原始岩浆,钠质流纹岩是该原始岩浆分离结晶产物,玄武岩浆则可能是源岩深度熔融的结果。岩石成分及微量元素判别该火山活动环境是大陆边缘弧。大兴安岭地区在中生代出现埃达克质火山岩及该类火山弧,未必与环太平洋或者鄂霍茨克海俯冲构造直接相关,而是晚古生代古亚洲洋残存洋壳在中生代沿续存俯冲断裂继续向增生地体下地壳俯冲并发生部分熔融结果。区内与满克头鄂博组有关的铁、铜、金矿化,应有大矿前景。

关键词： O型埃达克岩中生代火山岩大兴安岭南段岩石成因大陆动力学环境成矿作用

A promising one-step method for rice anther culture

在线全文

学校读者我要写书评

暂无评论

Chinese Rice Research Newsletter 1995年第1期3卷 2-3页

作者： ZHUO Lisheng,SI Huanmin,CHENG shihua,and sun Zongxia,CNRRI,Hangzhou 310006,China

The general two—step protocol for rice anther culture is time and labor consuming. Since 1982, there have been some papers dealing with a simpler one—step method that plantlets directly regenerate from callus on the initiation mediums which results in avoiding the procedure of callus transplant. So far,it is still difficult to be applied in practice due to their low frequency of direct regeneration. Recently, we successfully increased the frequency of direct plantlet regeneration with phenylacetic acid (PAA), which might make the one-step method practical, particularly for rice breeding and DH population construction.

关键词： BA PAA A promising one-step method for rice anther culture 口口 NAA

在线全文

学校读者我要写书评

暂无评论

100Hz彩电的核心处理技术

电视技术 1999年第3期23卷 43-44页

作者：孙士华青岛海信技术中心 266071

目前的彩色电视广播系统所采用的扫描和传输制式,都是在二三十年前制定的,存在着不少缺点,在一定程度上限制了图像质量的提高.

关键词：彩电核心处理技术电路分析

Association between QRS voltages and amyloid burden in patients with cardiac amyloidosis

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第3期137卷 365-367页

作者： Jing-Hui Li Changcheng Li Yucong Zheng Kai Yang Yan Huang Huixin Zhang Xianmei Li Xiuyu Chen Linlin Dai Tian Lan Yang sun Minjie Lu shihua Zhao Department of Magnetic Resonance Imaging Fuwai HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China Department of Radiology Taian City Central Hospital(The Affiliated Taian City Central Hospital of Qingdao University)Tai’anShandong 271099China Department of Radiology Tsinghua University HospitalTsinghua UniversityBeijing 100084China Department of Radiology The Fifth People’s Hospital of Huai’anHuai’anJiangsu 223001China Department of Radiology Geriatric Hospital of Nanjing Medical UniversityNanjingJiangsu 210000China Department of Cardiology Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Pathology Fuwai HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China

To the Editor:Cardiac amyloidosis(CA)is an infiltrative cardiomyopathy characterized by extracellular deposition of misfolded insoluble amyloid fibrils.^([1])Electrocardiography(ECG)is an essential diagnostic test characterized by low QRS voltages in CA,observed in 20–74%of patients.^([2])Cipriani et al^([3])reported that low QRS voltages could independently predict cardiovascular *** the mechanisms underlying low QRS voltages in CA remain unclear.

关键词： amyloid patients death.

明代徽商家族商业资本的积累与代际传承——以《万历收支银两册》为中心

在线全文

学校读者我要写书评

暂无评论

中国经济史研究 2024年第5期 41-60页

作者：孙丽王世华安徽师范大学历史学院芜湖241000 安徽师范大学经济管理学院芜湖241000

明代吴文奎家族商业经营持续230余年,《万历收支银两册》是其家族遗存的一册“家庭一商业”型珍贵账簿,揭示了家庭内部通过规定性资本分拔、资本收益和多名目补贴方式实现代际资本流动,从而完成家庭商业资本的积累和代际传承的过程。资... 详细信息

明代吴文奎家族商业经营持续230余年,《万历收支银两册》是其家族遗存的一册“家庭一商业”型珍贵账簿,揭示了家庭内部通过规定性资本分拔、资本收益和多名目补贴方式实现代际资本流动,从而完成家庭商业资本的积累和代际传承的过程。资本分拔和多名目补贴是代际传承的基础,资本分拔和资本收益是诸子资本增长的主要因素。与婚姻有关的回鞋银、与排行有关的长兄银和长孙银,以及分家析产和多名目补贴在徽商资本代际传承中普遍存在;而与年龄有关的千金资本和援例银则难得一见。这体现了吴文奎家庭商业资本积累和传承的一般性和特殊性。代际资本积累方式表现出深层的制度设计特征:一是由父本和子本构成的稳健的二元资本结构和单向的资本流动;二是高效的家庭成员分工协作制度;三是防止家庭商业资本被分散从而影响持续经营的“分产不分业”的资本析分制度。这些制度旨在保障家族商业以及家族本身的世代延续。

关键词：《万历收支银两册》资本积累代际传承徽商吴文奎家族

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

提高变电站综合自动化系统可靠性的措施研究

科技传播 2010年第22期2卷 28-29页

作者：孙诗华武汉市黄陂区供电公司生技部湖北武汉430300

随着微电子技术、计算机技术和通信技术的发展,变电站综合自动化技术也得到了迅速发展,并成为当前我国电力工业推行技术进步的重点之一。本文对提高变电站综合自动化系统可靠性的措施进行了研究。

关键词：变电站综合自动化可靠性措施