检索结果-南通市图书馆

Magnetoresistance enhancement and temperature stability of magnetoresistance in La_(1-x)(Sr_(1-y)Na_y)_xMnO_3

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第4期31卷 387-391页

作者： wang, guiying Yan, Guoqing Yang, Jie wang, Wenqi Tang, Yonggang Song, Qixiang Zhang, Mingyu Peng, Zhensheng Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base) Suzhou 234000China School of Mechanical and Electronic Engineering Suzhou UniversitySuzhou 234000China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

A series of the samples La_(1-x)(Sr_(1-y)Na_y)_xMnO_3(y=0.0,0.2,0.4,0.6,0.8,1.0) were prepared by the solid-state reaction *** enhancement and temperature stability of magnetoresistance in the system La_(1-x)(Sr_(1-y)Na_y)_xMnO_3 with unchanged Mn^(3+)/Mn^(4+) ratio through the doping of both monovalent and divalent elements at A site were studied through the measurements of X-ray diffraction(XRD) patterns,resistivity-temperature(ρ-T) curves and magnetoresistance-temperature(MR-T) *** results indicate that with the increase of Na doping amount,the peak value of MR increases,and it increases from 12.4% for y=0.2 to 50.6% for y=1.0 in the magnetic field B=0.8 T;ρ-T curves exhibit the double-peak phenomenon,which comes from the competition between the resistivity of surface phase and that of body phase;for the sample of y=0.8,MR increases slowly from 8.3% to 9.4% in the temperature range from 259 to 179 K,and MR is so stable in such a wide temperature range,which provides reference for the research on the temperature stability of MR.

关键词： magnetoresistance enhancement temperature stability perovskite manganite

LincRNA-1614 coordinates Sox2/PRC2-mediated repression of developmental genes in pluripotency maintenance

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2018年第2期10卷 118-129页

作者： Xudong Guo Zikang wang Chenqi Lu Wujun Hong guiying wang Yanxin Xu Zhongmin Liu Jiuhong Kang Clinical and Translational Research Center of Shanghai First Maternity & Infant Health Hospital Shanghai Key Laboratory of Signaling and Disease Research Collaborative Innovation Center for Brain Science School of Life Science and Technology Tongji University Shanghai 200092 China Institute of Regenerative Medicine East Hospital Tongji University School of Medicine Shanghai 200120 China Laboratory of Population and Quantitative Genetics institute of Biostatistics School of Life Sciences Fudan University Shanghai 200433 China

Large-intergenic noncoding RNAs （lincRNAs） cooperate with core transcription factors to coordinate the pluripotency network of embryonic stem cells. The mechanisms by which lincRNAs affect chromatin structure and gene transcription remain mostly unknown. Here, we identified that a UncRNA （linc1614）, occupied by pluripotency factors at its promoter, was indispensable for both maintenance and acquisition of pluripotency. Linc1614 sewed as a specific partner of core factor Sox2 in maintaining pluripotency, primarily by mediating the function of Sox2 in the repression of developmental genes. Moreover, Ezh2, an essential subunit of polycomb repressive complex 2 （PRC2）, physically interacted with linc1614 and contributed to lincRNA-mediated transcriptional silencing. Thus, we propose that the interplay of linc1614 with Sox2 implicates this lincRNA as a recruitment platform that mediates transcriptional silencing by guiding the PRC2 complex to the loci of developmental genes.

关键词： lincRNA Sox2 pluripotency maintenance PRC2 reprogramming

Low-field magnetoresistance of (1-x)La_(0.6)Dy_(0.1)Sr_(0.3)MnO_3/0.5x (Sb_2O_3) composite system under different sintering temperatures of matrix

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

Rare Metals 2012年第3期31卷 276-280页

作者： Yang, Jie Yan, Guoqing wang, guiying Tang, Yonggang Song, Qixiang Zhang, Mingyu Peng, Zhensheng Anhui Key Laboratory of Spintronic and Nanometric Materials Suzhou 234000 Anhui China School of Mechanical and Electronic Engineering Suzhou University Suzhou 234000 Anhui China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China

A series of (1-x)La0.6Dy0.1Sr0.3MnO3/0.5x(Sb2O3)(x=0.15) samples were prepared by the solid-state reaction method, and the influence of sintering temperature of the matrix on low-field magnetoresistance of (1-x)La0.6Dy0.1Sr0.3MnO3/0.5x (Sb2O3) was studied through the measurements of X-ray diffraction (XRD) patterns, scanning electron microscope (SEM) image, resistivity-temperature (ρ-T) curves, and magnetoresistance-temperature (MR-T) curves. The results indicate that for the samples with low sintering temperature of the matrix, lowfield magnetoresistance effect appears on the whole temperature range and can be explained by grain boundary effect; for the sample with high sintering temperature of the matrix, intrinsic magnetoresistance peak appears on the high-temperature range, low-field magnetore-sistance effect appears on low temperature range, and the magnetoresistance in the magnetic field of 0.2 T and on the comparatively large temperature range between 280 K and 225 K hardly changes with temperature and remains at 4.8%, which can be explained by the competition between the intrinsic magnetoresistance induced by double-exchange function inside grains and the tunneling magnetoresis-tance (TMR) induced by grain boundary effect. The temperature stability of magnetoresistance is beneficial to the practical applications of MR.

关键词： low-field magnetoresistance two-phase composite sintering temperature of the matrix perovskite manganite

在线全文

学校读者我要写书评

暂无评论

对煤炭中焦渣特征检测数据处理方法的探讨

质量与认证 2024年第9期 57-59页

作者：陈海林张秀全王桂影中国中检河北公司

本文对京唐港25个常见种类商品煤的焦渣特征进行检测,探讨了关于分单元焦渣特征检验结果依据收到基质量和空气干燥基质量加权平均计算整批货物的可能性,计算结果与配比混合结果无显著性差异。该方法在多个煤种或多个单元货物混配为一整... 详细信息

本文对京唐港25个常见种类商品煤的焦渣特征进行检测,探讨了关于分单元焦渣特征检验结果依据收到基质量和空气干燥基质量加权平均计算整批货物的可能性,计算结果与配比混合结果无显著性差异。该方法在多个煤种或多个单元货物混配为一整批煤时,可提高检验效率、缩短检验周期。

关键词：焦渣特征加权平均商品煤检验效率

Construction of the first high-density genetic map for growth related QTL analysis in Ancherythroculter nigrocauda

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2021年第3期39卷 1118-1130页

作者： Yanhong SUN Pei LI guiying wang Renli SUN Jian CHEN Qi ZHOU Jingou TONG Qing LI Fisheries Research Institute Wuhan Academy of Agricultural SciencesWuhan 430207China Wuhan Xianfeng Aquaculture Technology Co.Ltd. Wuhan 430207China Wuhan Academy of Agricultural Sciences Wuhan 430207China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Ancherythroculter nigrocauda is a fish endemic to the upper areas of the Changjiang(Yangtze)River in *** trait locus(QTL)mapping is a powerful tool to identify potential genes affecting traits of economic importance in domestic *** this study,a high-density genetic map was constructed with 5901 single nucleotide polymorphism(SNP)makers by sequencing 92 individual fish from a F1 family using the specific-locus amplified fragment sequencing ***,48 QTLs for total length,body length,body height,and body weight were identified according to the high density of the genetic map with 24 LGs,a total length of 3839.4 cM,and marker spacing of about 0.82 *** QTLs explained 27.1%-49.9%of phenotypic *** results of this study suggest that major QTLs are responsible for the growth of ***,and these are potentially useful in comparative genomics research,genome assembly,and marker-assisted breeding programs for this species.

关键词： Ancherythroculter nigrocauda specific-locus amplified fragment high-density genetic map quantitative trait locus

短期微流水处理对池塘养殖杂交鲌“先锋1号”肌肉品质的影响

在线全文

学校读者我要写书评

暂无评论

渔业科学进展 2024年第2期45卷 245-256页

作者：喻亚丽李清张浪孙艳红鲁晓蓉魏辉杰陈见李佩高银爱王贵英武汉市农业科学院水产研究所湖北武汉430207 中国水产科学研究院长江水产研究所农业农村部水产品质量安全风险评估实验室湖北武汉430223 武汉先锋水产科技有限公司湖北武汉430207

以池塘养殖杂交鲌“先锋1号”为对象,采用短期微流水处理,研究处理时间(0、4、8和12d)对杂交鲌“先锋1号”色度、肌纤维直径、肌肉质构特性、常规营养成分、氨基酸和脂肪酸含量的影响,以评价短时间微流水处理对杂交鲌“先锋1号”品质的... 详细信息

以池塘养殖杂交鲌“先锋1号”为对象,采用短期微流水处理,研究处理时间(0、4、8和12d)对杂交鲌“先锋1号”色度、肌纤维直径、肌肉质构特性、常规营养成分、氨基酸和脂肪酸含量的影响,以评价短时间微流水处理对杂交鲌“先锋1号”品质的提升作用。结果显示,微流水条件下,8 d和12 d皮的黄度值(b^(*))显著升高,各实验组肌肉的红度值(a^(*))显著降低(P0.05,下同);杂交鲌“先锋1号”在处理4d时的鲜味氨基酸总量(DAA)显著高于8d和12d;氨基酸总量(TAA)和必需氨基酸总量(EAA)变化不显著,各组必需氨基酸指数(EAAI)分别为77.33%、74.91%、76.56%和76.75%。第8天时,肌肉中顺-15-二十四碳一烯酸(C24:1)、花生三烯酸(C20:3n6)和花生四烯酸(C20:4n6)含量分别为6.85、41.05和53.84 mg/100 g显著高于其他各组,而α-亚麻酸含量,单不饱和脂肪酸总量和n-6多不饱和脂肪酸(n-6PUFAs)总量分别为48.05、1336.43和524.43 mg/100 g显著高于4 d和12 d。研究表明,短期微流水处理8 d时,在保证肌肉营养品质的同时,可有效改善其体色和肌肉颜色,增加肌肉口感,为池塘养殖淡水产品品质提升提供新的思路。

关键词：杂交鲌“先锋1号” 微流水处理质构特性肌肉品质

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

一种新型烟煤坩埚膨胀序数数字化判定方法

分析仪器 2024年第4期 87-90页

作者：陈海林房立冬王桂影张秀全康菲中国检验认证集团河北有限公司石家庄050000

介绍一种包含两种坩埚膨胀序数判定方式的方法,根据实验所得焦块不同选择不同的判定方式,一种为直线光源投影法,另一种为3D扫描法。借鉴于国标5448-2014和国际标准501-2012中坩埚膨胀序数标准图的数据,将数据通过CAD量化,作为系统判定... 详细信息

介绍一种包含两种坩埚膨胀序数判定方式的方法,根据实验所得焦块不同选择不同的判定方式,一种为直线光源投影法,另一种为3D扫描法。借鉴于国标5448-2014和国际标准501-2012中坩埚膨胀序数标准图的数据,将数据通过CAD量化,作为系统判定的根据。焦块形状与标准图接近的试样选择投影法,直接与数据对比;如焦块形状为不规则试样则选择扫描法,利用光感系统扫描焦块所得最大面数据,以及通过焦块的高度、上焦面直径、最宽处焦块直径和焦块最大面积与数据化的标准图数据进行比较,使用数据化判断。两种方式的设定可以减少人为误差和不规则图像函数化带来的不确定性,可以在确保实验效率的同时确保系统的稳定性和准确性。

关键词：坩埚膨胀序数光感应 3D扫描数据化

维普期刊数据库博看期刊

Enhancement of room-temperature magnetoresistance in La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/(Ag_2O)_(x/2)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2010年第1期29卷 45-49页

作者： PENG Zhensheng wang guiying TANG Yonggang LIU Peng NIU Xiaofei Anhui Key Laboratory. of Spintronics and Nano-materials Research Suzhou College Suzhou 234000 China Structure Research Laboratory University of Science and Technology of China Hefei 230026 China

La0.5Sm0.2Sr0.3MnO3/（Ag2O）x/2 （x = 0.00, 0.04, 0.08, 0.25, 0.30） samples were prepared by the solid-state reaction method, and their transport behaviors, transport mechanism, and magnetoresistance effect were studied through the measurement and fitting of p-T curves. The results show that the element Ag takes part in reaction when the doping amount is small. Ag is mainly distributed at the grain boundary of the host material and is in metallic state when the doping amount is relatively large; then the system becomes a two-phase composite. A small amount of Ag doping can apparently increase grain-boundary magnetoresistance induced by the spin-dependent scattering. The resistivity of the sample doped with 30 mol% Ag is one order of magnitude smaller than that of low-doped samples, and its magnetoresistance in the magnetic field of 0.5 T and at 300 K is strengthened apparently reaching 9.4%, which is connected not only with the improvement of the grain-boundary structure of the host material but also with the decrease of material resistivity.

关键词： low-field magnetoresistance room-temperature magnetoresistance grain-boundary magnetoresistance two-phase composite perovskite manganite

Noncontact Measurement of Surface Topography by Mirau Interferometer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1996年第4期B5卷 355-362页

作者： DING Zhihua wang guiying wang Zhijiang(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,P. O. Box 800-216, Shanghai 201800, China) Shanghai Inst of Optics and Fine Mechanics Chinese Acad of Sciences Shanghai China

ＮｏｎｃｏｎｔａｃｔＭｅａｓｕｒｅｍｅｎｔｏｆＳｕｒｆａｃｅＴｏｐｏｇｒａｐｈｙｂｙＭｉｒａｕＩｎｔｅｒｆｅｒｏｍｅｔｅｒ￥ＤＩＮＧＺｈｉｈｕａ；ＷＡＮＧＧｕｉｙｉｎｇ；ＷＡＮＧＺｈｉｊｉａｎｇ（ＳｈａｎｇｈａｉＩｎ... 详细信息

ＮｏｎｃｏｎｔａｃｔＭｅａｓｕｒｅｍｅｎｔｏｆＳｕｒｆａｃｅＴｏｐｏｇｒａｐｈｙｂｙＭｉｒａｕＩｎｔｅｒｆｅｒｏｍｅｔｅｒ￥ＤＩＮＧＺｈｉｈｕａ；ＷＡＮＧＧｕｉｙｉｎｇ；ＷＡＮＧＺｈｉｊｉａｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎ...

关键词： interferometer profiler roughness measurement phase detection