检索结果-南通市图书馆

Seasonal variations of organic carbon and nitrogen in the upper basins of Yangtze and Yellow Rivers

Journal of Mountain Science 2017年第8期14卷 1577-1590页

作者： LI Xiang-ying DING Yong-jian HAN Tian-ding XU Jian-zhong KANG shi-chang wu Qing-bai Mika Sillanp?? YU Zhong-bo YU Cong-rong College of Hydrology and Water Resources/State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences Laboratory of Green Chemistry School of Engineering ScienceLappeenranta University of Technology Department of Civil and Environmental Engineering Florida International University

The profound impacts exerted by climate warming on the Tibetan Plateau have been documented extensively, but the biogeochemical responses remain poorly understood. This study was aimed at seasonal variations of total organic carbon(TOC) and total organic nitrogen(TON) in stream water at two gauging sections(TTH, ZMD) in the upper basin of Yangtze River(UBYA) and at fourgauging sections(HHY, JM, JG, TNH) in the upper basin of Yellow River(UBYE) in 2013. Results showed that concentrations of TON exhibit higher values in spring and winter and lower values in summer. TOC exhibits higher concentrations in spring or early summer and lower concentrations in autumn or winter. Seasonal variations of TOC and TON fluxes are dominated by water flux. In total, the UBYE and UBYA delivers 55,435 tons C of organic carbon and 9,872 tons N of organic nitrogen to downstream ecosystems in 2013. Although the combined flux ofTOC from UBYA and UBYE is far lower than those from large rivers, their combined yields is higher than, or comparable with, those from some large rivers(e.g. Nile, Orange, Columbia), implying that organic carbon from the Tibetan Plateau may exert a potentially influence on regional and/or global carbon cycles in future warming climate.

关键词： Seasonal variation Total organic carbon(TOC) Total organic nitrogen(TON) Yangtze River Yellow River

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Irrigating with cooler water does not reverse high temperature impact on grain yield and quality in hybrid rice

引用

The Crop Journal 2023年第3期11卷 904-913页

作者： Wanju shi Xinzhen Zhang Juan Yang Somayanda M.Impa De Wang Yusha Lai Zijin Yang Hang Xu Jinshui wu Jianhua Zhang S.V.Krishna Jagadish College of Agronomy Hunan Agricultural UniversityChangsha 410128HunanChina Department of Biology Hong Kong Baptist UniversityKowloonHong KongChina State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinHong KongChina Department of Plant and Soil Sciences Texas Tech UniversityLubbockTX 79410USA International Rice Research Institute DAPO Box 7777Metro ManilaPhilippines

Rice grain yield and quality are negatively impacted by high temperature *** water temperature significantly affects rice growth and development,thus influencing yield and *** role of cooler irrigation water in counteracting high temperature induced damages in rice grain yield and quality are not ***,in the present study two rice hybrids,Liangyoupeijiu(LYPJ)and IIyou 602(IIY602)were exposed to heat stress and irrigated with water having different temperatures in a splitsplit plot experimental *** stress was imposed starting from heading until maturity under field-based heat tents,over two consecutive *** maximum day temperature inside the heat tents was set at 38℃.For the irrigation treatments,two different water sources were used including belowground water with cooler water temperature and pond water with relatively higher water *** mean temperatures in the heat tents were increased by 1.2–2.0℃ across two years,while nighttime temperature remained similar at both within and outside the heat *** belowground water irrigation did have little effect on air temperature at the canopy level but decreased soil temperature(0.2–1.4℃)especially under *** stress significantly reduced grain yield(33%to 43%),panicles m^(-2)(9%to 10%),spikelets m^(-2)(15%to 22%),grain-filling percentage(13%to 26%)and 1000-grain weight(3%to 5%).Heat stress significantly increased chalkiness and protein content and decreased grain length and amylose *** yield was negatively related to air temperature at the canopy level and soil *** grain quality parameters like chalkiness recorded a significantly positive association with both air and soil *** with cooler belowground water reduced the negative effect of heat stress on grain yield by 8.8%in LYPJ,while the same effect was not seen in IIY602,indicating cultivar differences in their response to irrigation water ***

关键词： Grain quality Grain yield Hybrid rice High temperature Irrigation Water management

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficacy of the WINROP algorithm for retinopathy of prematurity screening in Southern China

引用

International Journal of Ophthalmology(English edition) 2021年第1期14卷 127-132页

作者： Yi-Chen Bai Rong wu Si-Zhe Chen shi-Yu Wei Hui-Jie Chen Yan-Chen Chen Song-Fu Feng Xiao-He Lu Department of Ophthalmology Zhujiang HospitalSouthern Medical UniversityGuangzhou 510282Guangdong ProvinceChina Department of Ophthalmology Liuzhou People’s HospitalLiuzhou 545006Guangxi Zhuang Autonomous RegionChina Department of Pediatric Zhujiang HospitalSouthern Medical UniversityGuangzhou 510282Guangdong ProvinceChina

AIM:To evaluate the predicting efficacy of severe retinopathy of prematurity(ROP)by the WINROP algorithm(http://***)in Southern ***:All preterm infants with the gestational age(GA)less than 32 wk were *** ROP screening results and serial postnatal body weight were analysed *** body weight was entered into and measured by the WINROP *** outcomes were analysed,and the sensitivity,specificity,positive predictive value and negative predictive value(NPV)were ***:Totally 432 infants with a median GA of 30.0(24.0-31.9)wk,and a median birth weight(BW)of 1360(540-2700)g were *** these 432 infants,50 were diagnosed as type 1 ROP but only 28 were identified by the WINROP *** sensitivity was 56%(28/50)and the NPV was 92%(252/274).However,for infants with BW28 wk in China.

关键词： retinopathy of prematurity WINROP preterm infants

来源：

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

Corrigendum to"Preparation of high-purity straight silicon nanowires by molten salt electrolysis"[Journal of Energy Chemistry 40(2020)171-179]

引用

Journal of Energy Chemistry 2020年第1期29卷 224-224,I0008页

作者： Jie Zhang Sheng fang Xiaopeng Qi Zhanglong Yu Zhaohui wu Juanyu Yang shigang Lu General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. LtdBeijing 100088China

来源：

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

The precursor frequency of alloreactive CTLs is proportional to the number of T cell epitope specificities

引用

Journal of Microbiology and Immunology 2006年第2期4卷 131-136页

作者： CAI E ZHANG shi JIANG FEI XIONG WEN wu ZHI HUI LIANG XIU fang WENG SHENG JUN LU XIAO LING LU fang ZHEN XIA MAO HUA ZHONG LI GONG Department of Immunology Tongji Medical College Huazhortg University of Science and Technology Wuhan P. R. China. Zhongshan Hospital of Hubei Province Wuhan P. R. China.

The aim of this study is to find the experimental evidence that the precursor frequency of alloreactive CTLs is proportional to the number of the T-cell epitope specificities. The number of T-cell epitope specificities was manipulated by pulsing different humor of HLA-A2 restricted peptide（s） onto the T2 cells, which acted as stimulating cells to elicit allo-reaction by co-culturing with peripheral blood lymphocytes （PBLs） of HLA-A2 negative individual. Ten HLA-A2 restricted peptides （all were normal cell components ） were synthesized, and cell peptide extract was prepared by frozen and thawed. T2 cells loaded with different number of peptide（s） were co-cultured with PBLs of an HLA-A2 negative individual; the latter were stained with PKH67 in advance. Then the proliferation was monitored with flow cytometry, and the precursor frequency of the effector cells was ＇analyzed by the ModFit Software. After 6 d of culture, no proliferation was observed in the bulk culture of PBL alone, and obvious proliferation took place when PBLs of the HLA-A2 negative were co-cultured with T2 cells loaded with or without loading peptide（ s）. The precursor frequency of the alloreactive CTLs was 0.052 819 for co-culture with T2 cells loaded without peptide; however it was 0. 030 429 for T2 cells with EBV/LMP2A and 0. 030 528 for T2 cells loaded with a single autogeneic peptide, and increased up to 0. 144 942 for T2 cells loaded with 10 autogeneic peptides; the precursor frequency was 0. 203 649 when co-cultured with T2 cells loaded with miscellaneous peptides extracted from the cytoplasm of T2 cells. This study reveals that the precursor frequency of alloreactive CTLs is proportional to the number of T-cell epitope specificities, and independent of the density of the allogeneic HLA Class Ⅰ molecule. Our findings support the hypothesis that the alloreactive T cell populations comprise miscellaneous T cell clones; each is specific to corresponding pMHC. The novel constellation of peptides p

关键词： T2 cells Loading peptides Alloreactive CTLs Proliferation Precursor frequency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design of control algorithm for accelerator magnet power supply with large time constant load

引用

Radiation Detection Technology and Methods 2020年第3期4卷 383-391页

作者： Xu Wang Peng Liu FengLi Long WenTong Su Yao Gao XiaoLei shi Tao Zeng GuanJian wu Jian Cheng Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Objective High Energy Photon Source-Test Facility(HEPS-TF)is a pre-research project for the construction of high energy synchrotron radiation source in the 12th five-year plan *** purpose is to research the key technology and develop the key equipment of high energy synchrotron radiation *** 3W1 magnet is the first self-developed superconducting wiggler magnet in China,and it is also one of the key research topics of *** author has completed a new digital closed-loop control algorithm for the superconducting 3W1 magnet with large load time constant and the nonlinear characteristics of inductance increasing with current,namely three-branch structure *** the face of the rapid development of high energy accelerator technology,the application of intelligent technology has become an inevitable development trend in the field of accelerator magnet power supply *** the digital control of accelerator magnet power supply has been widely used,it is the first time to apply the new closed-loop control algorithm to realize fast adjustment and precision tracking in accelerator superconducting magnet power supply in *** According to the nonlinear characteristics of inductance and output current of superconducting magnet,a new digital closed-loop control algorithm for the load of superconducting magnet power supply with large time constant is *** This algorithm is quite different from the traditional algorithm and can attain the independent tracking and adjust-ment of the control ***,by testing the ripple,error and stability of superconducting 3W1 magnet power supply,the correctness,practicability and reliability of power supply system as well as the digital control algorithm are *** results provide a new idea for the control of accelerator magnet power supply.

关键词： Closed-loop control algorithm Load time constant Superconducting magnets Three-branch structure

来源：

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

被动轮式推进器设计

引用

中国石油大学学报（自然科学版） 2021年第1期45卷 183-192页

作者：贾朋房军吴烁中国石油大学(华东)储运与建筑工程学院山东青岛266580 石油工程教育部重点实验室(中国石油大学(北京)) 北京102249 北京探矿工程研究所北京100083

针对连续管水平井钻进过程中存在的屈曲锁死、钻压不足等问题,设计一种基于钻柱侧向弹性的增强动力轮式推进器,可获得较高的轴向推拉力。应用钻柱纵横弯曲理论和齿轮-钻屑的几何关系,分别建立包含轮式推进器的底部钻具组合力学模型和蜗... 详细信息

针对连续管水平井钻进过程中存在的屈曲锁死、钻压不足等问题,设计一种基于钻柱侧向弹性的增强动力轮式推进器,可获得较高的轴向推拉力。应用钻柱纵横弯曲理论和齿轮-钻屑的几何关系,分别建立包含轮式推进器的底部钻具组合力学模型和蜗轮蜗杆卡阻力学模型,利用模型分析轮式推进器的工作特性。结果表明仅靠钻柱自重产生的推拉力有限,利用偏心垫块与推进器串联组合所产生的钻柱侧向弹性可大幅提高轴向推拉力;偏心垫块-推进器组合的轴向推拉力随两者间距的减小而增大、随偏心距增大而增大,较自重式推进器提高10倍。最大被卡钻屑尺寸随齿轮模数和齿数的增大而增大;卡阻力与钻屑和齿轮材料的强度比正相关。

关键词：轮式推进器蜗轮蜗杆推拉力齿轮卡阻牵引能力

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Possible Modification of Einstein＇s Theory of General Relativity

引用

Communications in Theoretical Physics 2004年第3期41卷 377-380页

作者： QIANShang-wu PhysicsDepartment PekingUniversityBeijing100871China

This article suggests a new metric theory of gravitation, in which metric field is determined not only by matter and nongravitational field but also by vector graviton field, and in principle there is no need to introduce the Einstein's tensor. In order to satisfy automatically the geodesic postulate, an additional coordinate condition is needed. For the spherically symmetric static field, it leads us to quite different conclusions from those of Einstein's general relativity in the interior region of the surface of infinite redshift. Accurate to the first order of , it obtains the same results about the four experimental tests of general relativity.

关键词： general relativity metric theory of gravitation vector graviton field

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geological and chronological evidence of Indo-Chinese strike-slip movement in the Altyn Tagh fault zone

引用

Chinese Science Bulletin 2002年第1期47卷 27-32页

作者： LI Haibing YANG Jingsui XU Zhiqin wu Cailai WAN Yusheng shi Rendeng Juhn G.Liou P.Tapponnier Trevor R.Ireland Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Department of Geological&Environmental Sciences Stanford UniversityStanfordCA 94305-2115USA Institut de Physique du Globe 4 Place Jussieu75252 Pans Cedex 05France

A set of granitic and amphibole mylonite are exposed in the Altyn Tagh fault zone. The preliminary study shows that these rocks are the product of the syntectonic anatexis in the process of the left-lat- eral strike-slip shear, and are the result of the ductile transpression. There are two types of zircon sorted from the mylonite formed with syn-shear anatexis. Among them, one is the anatectic long co-lumnar zircon and another is the residual metamorphic sub-rounded columnar zircon. Two groups of age for single zircon measured by ion microprobe (SHRIMP) are obtained: one is 461-547 Ma for the sub-rounded columnar residual metamorphic zircon, and the other is 239-244 Ma for the long-columnar anatectic zircon. This type of zircon is direc-tionally spread in rock, and the long axis direction of its crystal is identical to that of stretching lineation, represent-ing the direction of tectonic stress in the process of the strike-slip. 40Ar-39Ar age of the directional growth horn-blende in the same mylonite

关键词： Altyn Tagh fault zone syntectonic anatexis mylonite zircon directional spread U-Pb SHRIMP age Ar-Ar age.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Caffeic acid phenethyl ester up-regulates antioxidant levels in hepatic stellate cell line T6 via an Nrf2-mediated mitogen activated protein kinases pathway

引用

World Journal of Gastroenterology 2017年第7期23卷 1203-1214页

作者： Ning Yang Juan-Juan shi Feng-Ping wu Mei Li Xin Zhang Ya-Ping Li Song Zhai Xiao-Li Jia Shuang-Suo Dang Department of Infectious Diseases the Second Affiliated Hospital of Medical School of Xi’an Jiaotong UniversityXi’an 710004Shannxi ProvinceChina

AIM To investigate the antioxidant effect of caffeic acid phenethyl ester (CAPE) in hepatic stellate cell-T6 (HSC-T6) cells cultured in vitro and the potential mechanisms. METHODS HSC-T6 cells were cultured in vitro and treated with various concentrations of CAPE for 24, 48 and 72 h, respectively. Cell proliferation was investigated using the MTT assay, and cell ultrastructural alterations were observed by transmission electron microscopy. Flow cytometry was employed to investigate the effects of CAPE on apoptosis and the levels of reactive oxygen species in HSC-T6 cells cultured in vitro. An enzyme immunoassay instrument was used to evaluate antioxidant enzyme expression. The effect on alpha-smooth muscle actin was shown using immunofluorescence. Gene and protein levels of Nrf2, related factors, and mitogen activated protein kinases (MAPKs), in HSC-T6 cells were detected using RT-PCR and Western blot, respectively. RESULTS CAPE inhibited the proliferation and activation of HSC-T6 cells cultured in vitro. CAPE increased the antioxidant levels and the translocation of Nrf2 from the cytoplasm to the nucleus in HSC-T6 cells. Moreover, the phosphorylation of MAPKs in cells decreased in response to CAPE. Interestingly, CAPE-induced oxidative stress in the cells was significantly attenuated by pretreatment with MAPKs inhibitors. CONCLUSION CAPE inhibits cell proliferation and up-regulates the antioxidant levels in HSC-T6 cells partly through the Nrf2-MAPKs signaling pathway.

关键词： Caffeic acid phenethyl ester Liver fibrosis Antioxidation Nrf2 Mitogen activated protein kinases

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：