检索结果-南通市图书馆

二硫化钼和碳纳米管复合物电极用于盐差能转换

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电化学（中英文） 2024年第6期30卷 32-44页

作者：李家俊张伟彬刘鑫宇杨静蕾尹易杨泽钦马雪婧成都理工大学材料与化学化工学院四川成都610059

海洋占地球水资源总量的97%,地表面积的70%以上。随着化石燃料等不可再生能源的持续消耗与可再生能源的快速发展,人们对海洋资源的利用越来越重视。海洋能包括潮汐能、波浪能、温差能和盐差能等。其中盐差能是海水和淡水相互作用产生的... 详细信息

海洋占地球水资源总量的97%,地表面积的70%以上。随着化石燃料等不可再生能源的持续消耗与可再生能源的快速发展,人们对海洋资源的利用越来越重视。海洋能包括潮汐能、波浪能、温差能和盐差能等。其中盐差能是海水和淡水相互作用产生的能量,是以化学能形式存在的海洋能,这种能量较多产生在河口处。目前,压力延迟渗透技术、反电渗析技术和电容混合技术是转换盐差能的三种主要技术。本文构建了一种基于电容混合技术的新型盐差电池,使用二硫化钼和多壁碳纳米管复合物电极作为阳极,活性炭作为阴极。将两种不同离子储存机制的材料复合在一起,二硫化钼具有类似石墨烯的层状结构,层间间距约为石墨烯的两倍,是一种可以与钠离子发生插层反应的电池电极材料。多壁碳纳米管具有典型的双电层效应,放电时在其表面吸附钠离子的同时,可以帮助钠离子更快地进入二硫化钼层间,加快离子传输效率和盐差能的转换效率。对该复合材料进行物理和电化学表征,并与活性炭电极组装的盐差电池,测试其盐差能转换能力。浓度响应电压150 mV,经过一个完整的四步循环后,转换能量密度可达6.96 J·g^(-1)。该器件原材料价格较低,并且不使用离子膜,更加环保,为转换盐差能的研究提供了一种新途径。

关键词：盐差量电化学转化转换效率二硫化钼碳纳米管

四川盆地栖霞组——茅口组沉积储层特征及勘探领域

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

海相油气地质 2024年第3期29卷 303-315页

作者：倪超张本健褚春波郝毅谷明峰潘立银李梦莹姚倩颖朱可丹中国石油杭州地质研究院浙江省杭州市310023 中国石油西南油气田公司勘探开发研究院中国石油大庆油田勘探事业部中国石油集团碳酸盐岩储层重点实验室

二叠系栖霞组—茅口组是四川盆地天然气勘探的重点层系,为了寻找栖霞组—茅口组未来天然气勘探的重点方向,在大量钻井、野外露头、测井、地震及地球化学数据等资料分析的基础上,针对四川盆地栖霞组—茅口组的沉积储层关键地质问题进行... 详细信息

二叠系栖霞组—茅口组是四川盆地天然气勘探的重点层系,为了寻找栖霞组—茅口组未来天然气勘探的重点方向,在大量钻井、野外露头、测井、地震及地球化学数据等资料分析的基础上,针对四川盆地栖霞组—茅口组的沉积储层关键地质问题进行了研究,并对勘探领域进行了梳理分析。结果表明:(1)四川盆地栖霞—茅口期主要为台地沉积体系,可以划分为3个层序。除川西台缘带之外,盆内川中—川东地区栖霞组—茅口组在三级层序高位域发育多期高能浅滩,总面积超过4×10~4km~2。(2)栖霞组—茅口组主要储层为孔隙-孔洞型白云岩、岩溶缝洞型灰岩以及微孔-微缝型泥灰岩。其中,孔隙-孔洞型白云岩是近期勘探的主要储集岩类型,栖霞组白云岩主要分布在川西广元—北川—雅安—峨眉一带,茅口组白云岩主要分布在宣汉—万州、广元—剑阁地区以及剑阁—广安—丰都一带。(3)四川盆地栖霞组—茅口组天然气勘探可划分为4个现实领域及2个潜在领域。其中,川北—川中—川东茅二段白云石化滩带是目前中二叠统天然气增储上产最重要的现实勘探领域,而川东茅二下亚段孤立白云石化浅滩有望成为未来最重要的勘探领域之一。

关键词：岩相古地理储层类型储层特征勘探领域栖霞组茅口组四川盆地

Steady-state Voltage Reactive Compensation Method for Half-wavelength Transmission Lines Considering Equivalent Power Supply Impedance

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2020年第4期6卷 841-847页

作者： jun yi Wei Hu Zijie Zhang Lu Qiu Ansi Wang Bowen Yan Canbing Li Quanyou Yue China Electric Power Research Institute Beijing 100192China State Key Laboratory of Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Hunan Key Laboratory of Intelligent Information Analysis and Integrated Optimization for Energy Internet Hunan UniversityChangsha 410006China Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Half-wavelength AC transmission(HWACT)refers to transmission along lines with an electrical distance of half the power frequency *** voltage amplitude at the sending terminal is equal to that at the receiving terminal in ***,the voltage at the receiving terminal does not vary with ***,the electrical distance has been extended in actual HWACT lines because of the impact of the equivalent power supply impedance,so the attractive characteristics no longer *** a result,reactive power compensation methods with constant power factor and constant voltage are needed and these are presented in this *** steady-state operational characteristics,the calculation methods of additional reactive power compensation and the admittance of a controllable shunt reactor are also *** methods proposed in this paper are relatively simple to implement,and the calculations involved are straightforward,resulting in effective voltage *** results indicate that such compensation methods can increase the transmission capacity while maintaining a relatively low voltage along the line.

关键词： half-wavelength AC transmission(HWACT) reactive power compensation steady state transmission lines

Broncholithiasis-induced bronchial artery fistula and pulmonary artery fistula in an aged female： a case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第4期123卷 507-509页

作者： SHANG Yan BAI Chong HUANG Hai-dong DONG Yu-chao HUANG yi yao Xiao-peng LI Qiang Department of Respiratory Medicine Changhai Hospital Second Military Medical University Shanghai 200433 China

Broncholithiasis, a rare disorder of the respiratory system, is usually caused by pulmonary fungal infection and tuberculosis occurring in the early years of its victims. Pulmonary fungal infection and tuberculosis can lead to calcification of the hilar and mediastinal lymph nodes; the calcified lymph nodes erode the nearby bronchi and cause clinical and imaging abnormalities. When the calcified lymph nodes press or invade the bronchial lumens, changing the bronchial lumen shape, stimulating the mucous membrane and eroding the luminal wall, clinical manifestations of penetrating broncholithiasis, such as cough, sputum, hemoptysis, lithoptysis, recurrent pneumonia, peribronchial fistula,

关键词： broncholithiasis clinical manifestations diagnosis treatment

Molecular cloning, sequence analysis, and cadmium stress-rated expression changes of BTG1 in freshwater pearl mussel(Hyriopsis schlegelii)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Zoological Research 2014年第5期35卷 389-397页

作者： Kou PENG Cheng-Yuan WANG jun-Hua WANG jun-Qing SHENG Jian-Wu SHI Jian LI yi-Jiang HONG School of Life Sciences and Food Engineering Nanchang University Institute of Life Science Nanchang University

The B cells translocation gene 1 （BTG1） is a member of the BTG/TOB family of anti-proliferative genes, which have recently emerged as important regulators of cell growth and differentiation among vertebrates. Here, for the first time we cloned the full-length eDNA sequence of Hyriopsis schlegelii （Hs-BTG1）, an economically important freshwater shellfish and potential indicator of environmental heavy metal pollution, for the first time. Using rapid amplification of eDNA ends （RACE） together with splicing the EST sequence from a haemocyte eDNA library, we found that Hs-BTG1 contains a 525 bp open reading frame （ORF） encoding a 174 amino-acid polypeptide, a 306 bp 5＇ untranslated region （5＇ UTR）, and a 571 bp 3＇ UTR with a Poly（A） tail as well as a transcription termination signal （AATAAA）. Homologne searching against GenBank revealed that Hs-BTG1 was closest to Crassostrea gigas BTG1, sharing 50.57% of protein identities. Hs-BTG1 also shares some typical features of the BTG/TOB family, possessing two well-conserved A and B boxes. Clustering analysis of Hs-BTG1 and other known BTGs showed that Hs-BTG1 was also closely related to BTG1 of C. gigas from the invertebrate BTG1 clade. Function prediction via homology modeling showed that both Hs-BTG1 and C. gigas BTG1 share a similar three-dimensional structure with Homo sapiens BTG1. Tissue-specific expression analysis of the Hs-BTG1 via real-time PCR showed that the transcripts were constitutively expressed, with the highest levels in the hepatopancreas and gills, and the lowest in both haemocyte and muscle tissue. Expression levels of Hs-BTG1 in hepatopancreas （2.03-fold）, mantle （2.07-fold）, kidney （2.2-fold） and haemocyte （2.5-fold） were enhanced by cadmium （Cd2＋） stress, suggesting that Hs-BTG 1 may have played a significant role in H, schlegelii adaptation to adverse environmental conditions.

关键词： Hyriopsis schlegelii BTG1 Gene cloning mRNA expression Cadmium stress

Tripartition of Arbitrary Single-Qubit Information via a Class of Asymmetric Four-Qubit W State

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第10期52卷 606-610页

作者： yiN Xiao-Feng LIU yi-Min SHI Shi-Wei ZHANG Wen ZHANG Zhan-jun School of Physics ＆ Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of Ministry of Education School of Physics Material Science Anhui University Hefei 230039 China

A four-party scheme is put forward for a sender to partition arbitrary single-qubit information among three receivers by utilizing a class of asymmetric four-qubit W state as quantum channels. In the scheme the sender＇s quantum information can be recovered by the three receivers if and only if they collaborate together. Specifically, they collaborate to perform first two different 2-qubit collective unitary operations and then a single-qubit unitary operation. The scheme is symmetric and （3, 3）-threshold with regard to the reconstruction, for any receiver can be assigned to conclusively recover the quantum information with the other two＇s assistances.

关键词： four-party scheme tripartition arbitrary single-qubit quantum information asymmetric fourqubit W state

乡村产业振兴背景下村级特色产业发展路径探析

在线全文

学校读者我要写书评

暂无评论

安徽农学通报 2024年第18期30卷 137-140页

作者：唐研房毅孙传仁许林车根姚国蓬山东省农业科学院农业信息与经济研究所山东济南250100 山东省农业科学院山东济南250100 山东省临沂市费县胡阳镇兴胜村山东临沂273400

本文采用实地调研和文献查阅相结合的方法,对胡阳西红柿产业进行调研分析,探讨了村级特色产业发展的现状和亟待提升的环节。针对村级特色产业规模、村民农技知识、农产品品牌效益和农产品电商经营等方面,提出“一村一品”+合作社,品牌+... 详细信息

本文采用实地调研和文献查阅相结合的方法,对胡阳西红柿产业进行调研分析,探讨了村级特色产业发展的现状和亟待提升的环节。针对村级特色产业规模、村民农技知识、农产品品牌效益和农产品电商经营等方面,提出“一村一品”+合作社,品牌+技术创新,投资+产业多元化,乡村人才+能人+培养,村级文化符号+精神文化产业等村级特色产业的发展路径,为乡村产业振兴背景下村级特色产业发展提供参考。

关键词：乡村产业振兴村级产业特色产业发展路径

比较蛋白质组学揭示茉莉酸甲酯诱导的雷公藤甲素生物合成

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

中国现代中药 2024年第2期26卷 316-327页

作者：张逸风赵瑜君苏平吴晓毅夏梦高伟黄璐琦中国中医科学院中药资源中心道地药材品质保障与资源持续利用全国重点实验室北京100700 首都医科大学中医药学院北京100069

目的:探索雷公藤甲素生物合成途径,以提高其产量或用于合成生物学异源生产。方法:使用无标记(lable-free)比较蛋白质组学对茉莉酸甲酯(MeJA)诱导的雷公藤悬浮细胞进行测序,通过京都基因与基因组百科全书(KEGG)、基因本体(GO)分析等方法... 详细信息

目的:探索雷公藤甲素生物合成途径,以提高其产量或用于合成生物学异源生产。方法:使用无标记(lable-free)比较蛋白质组学对茉莉酸甲酯(MeJA)诱导的雷公藤悬浮细胞进行测序,通过京都基因与基因组百科全书(KEGG)、基因本体(GO)分析等方法,结合基因转录表达分析和基因体内功能研究,逐步筛选参与雷公藤甲素生物合成的功能基因。结果:MeJA诱导不同时间的样品组鉴定得到376个差异蛋白质,包括8个细胞色素P450酶(CYP450)、3个转录因子(TF)和2-氧戊二酸依赖的双加氧酶(2ODD)。其中CYP71BE89、CYP82AQ2和Tw2ODD基因在MeJA诱导及植物不同组织部位中,均与已知参与雷公藤甲素母核环化的二萜合酶TwTPS7(v2)和TwTPS27(v2)基因具有相似的表达模式,表明其可能与雷公藤甲素生物合成相关。进一步利用植物细胞体内功能研究,验证了CYP71BE89、CYP82AQ2和Tw2ODD基因干扰使雷公藤甲素积累分别降低了24.1%、41.4%和71.4%,表明了3个基因与雷公藤甲素生物合成直接相关。结论:利用比较蛋白质组学技术揭示了几种与雷公藤甲素生物合成相关的蛋白,进一步表征了雷公藤甲素生物合成与外源激素刺激之间的关系,并为发掘中药活性成分生物合成途径提供了一种有效方法。

关键词：雷公藤比较蛋白质组学雷公藤甲素细胞色素P450酶 2-氧戊二酸依赖的双加氧酶

Changes in lumbosacral spinal nerve roots on diffusion tensor imaging in spinal stenosis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第11期10卷 1860-1864页

作者： Zhong-jun Hou Yong Huang Zi-wen Fan Xin-chun Li Bing-yi Cao Department of Radiology the Second Affiliated Hospital of Guangzhou Medical University Department of Orthopedics the Second Affiliated Hospital of Guangzhou Medical University Department of Radiology the First Affiliated Hospital of Guangzhou Medical University

Lumbosacral degenerative disc disease is a common cause of lower back and leg pain. Conventional T1-weighted imaging（T1WI） and T2-weighted imaging（T2WI） scans are commonly used to image spinal cord degeneration. However, these modalities are unable to image the entire lumbosacral spinal nerve roots. Thus, in the present study, we assessed the potential of diffusion tensor imaging（DTI） for quantitative assessment of compressed lumbosacral spinal nerve roots. Subjects were 20 young healthy volunteers and 31 patients with lumbosacral stenosis. T2 WI showed that the residual dural sac area was less than two-thirds that of the corresponding normal area in patients from L3 to S1 stenosis. On T1 WI and T2 WI, 74 lumbosacral spinal nerve roots from 31 patients showed compression changes. DTI showed thinning and distortion in 36 lumbosacral spinal nerve roots（49%） and abruption in 17 lumbosacral spinal nerve roots（23%）. Moreover, fractional anisotropy values were reduced in the lumbosacral spinal nerve roots of patients with lumbosacral stenosis. These findings suggest that DTI can objectively and quantitatively evaluate the severity of lumbosacral spinal nerve root compression.

关键词： nerve regeneration magnetic resonance imaging diffusion tensor imaging lumbosacralarea degeneration nerve root fractional anisotropy neural regeneration