检索结果-南通市图书馆

Kinetic Energy of Trapped Ions Cooled by Buffer Gas

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第6期27卷 82-84页

作者： CHEN Liang she lei LI Jiao-Mei GAO Ke-Lin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 Center for Cold Atom Physics Chinese Academy of Sciences Wuhan 430071 Graduate School of the Chinese Academy of Sciences Beijing 100049

The average kinetic energy of 40 Ca＋ ions is measured by the method of evaporating ions in an rf ion trap. The kinetic energy of the ion 40Ca＋ varies from 0.5eV to 0.2eV with changing buffer gas pressure from 10^-7 mbar to 10^-5 mbar. The Brownian motion model is also introduced to calculate the average kinetic energy of the trapped ions.

关键词： STOPPING power (Nuclear physics) ION traps CALCIUM ions EVAPORATION (Chemistry) VAPOR pressure BROWNIAN motion processes

Deposition of copper nanoparticles on multiwalled carbon nanotubes modified with poly （acrylic acid） and their antimicrobial application in water treatment

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

Frontiers of Environmental Science & Engineering 2015年第4期9卷 625-633页

作者： Li sheNG Shuhang HUANG Minghao SUI Lingdian ZHANG lei she Yong CHEN State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China

A novel hybrid material, Cu-PAA/MWCNTs （copper nanoparticles deposited multiwalled carbon nano- tubes with poly （acrylic acid） as dispersant, was prepared and expected to obtain a more effective and well-dispersed disinfection material for water treatment. X-ray energy dispersive spectroscopy （EDS）, transmission electron microscopy （TEM）, the X-ray fluorescence （XRF）, X-ray photoelectron spectra （XPS）, Fourier transform infrared spectra （FT-IR）, Raman spectroscopy, and thermal gravi- metric analyzer （TGA） were used to characterize the Cu- PAA/MWCNTs. Escherichia coli （E. coil） was employed as the target bacteria. The cell viability determination and fluorescence imaging results demonstrated that Cu-PAA/ MWCNTs possessed strong antimicrobial ability on E. coil. The deposited Cu was suggested to play an important role in the antimicrobial action of Cu-PAA/MWCNTs.

关键词： multiwalled carbon nanotubes copper nanoparticles antimicrobial activity Escherichia coli (E. coil)

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

松褐天牛肿腿蜂对东亚伪花天牛的寄生性

中国森林病虫 2024年第3期43卷 9-13页

作者：佘蕾王丽娜唐艳龙康奎王小艺魏可遵义市林业综合服务中心贵州遵义563002 遵义师范学院生物与农业科技学院贵州遵义563002 中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林保护学重点实验室北京100091

为明确松褐天牛肿腿蜂Sclerodermus alternatusi对东亚伪花天牛Anastrangalia dissimilis的寄生性,以东亚伪花天牛老熟幼虫和蛹为替代寄主,在人工气候箱内研究松褐天牛肿腿蜂能否成功寄生,及寄生后其子代的发育情况等。结果表明:松褐天... 详细信息

为明确松褐天牛肿腿蜂Sclerodermus alternatusi对东亚伪花天牛Anastrangalia dissimilis的寄生性,以东亚伪花天牛老熟幼虫和蛹为替代寄主,在人工气候箱内研究松褐天牛肿腿蜂能否成功寄生,及寄生后其子代的发育情况等。结果表明:松褐天牛肿腿蜂可寄生东亚伪花天牛老熟幼虫和蛹,且其对2种虫态的寄生率和子代羽化率差异显著;雌蜂产卵前期分别为6.15 d和6.29 d,子代卵期分别为3.71 d和3.90 d,幼虫期分别为7.13 d和7.22 d,蛹期分别为17.92 d和17.78 d,卵―蛹历期分别为28.76 d和29.00 d,均无显著差异;子代雌蜂数量分别为32.00头/管和19.28头/管,子代蜂总数分别为33.68头/管和20.56头/管,差异均显著;子代雄蜂数量分别为1.68头/管和1.28头/管,差异不显著;子代雄性比分别为5.08%和6.28%,差异显著。利用东亚伪花天牛老熟幼虫繁育松褐天牛肿腿蜂,其子代羽化率更高,获得的子代雌蜂数量和子代蜂总数量更多,老熟幼虫的繁蜂效果优于蛹。该结果可为松褐天牛肿腿蜂的人工繁育提供基础信息资料。

关键词：松褐天牛肿腿蜂替代寄主东亚伪花天牛发育历期子代数量

Chord length sampling correction analysis for dispersion fuel in Monte Carlo simulation

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

Nuclear Science and Techniques 2024年第4期35卷 57-64页

作者： Zhao-Yu Liang Ding she Yu-Tong Wen lei Shi Institute of Nuclear and New Energy Technology(INET) Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

Dispersion fuels,knowned for their excellent safety performance,are widely used in advanced reactors,such as hightemperature gas-cooled *** with deterministic methods,the Monte Carlo method has more advantages in the geometric modeling of stochastic *** explicit modeling method has high computational accuracy and high computational *** chord length sampling(CLS)method can improve computational efficiency by sampling the chord length during neutron transport using the matrix chord length?s probability density *** study shows that the excluded-volume effect in realistic stochastic media can introduce certain deviations into the CLS.A chord length correction approach is proposed to obtain the chord length correction factor by developing the Particle code based on equivalent transmission *** numerical analysis against reference solutions from explicit modeling in the RMC code,it was demonstrated that CLS with the proposed correction method provides good accuracy for addressing the excludedvolume effect in realistic infinite stochastic media.

关键词： Stochastic media Monte Carlo Chord length sampling Excluded-volume effect Chord length correction

Source apportionment of heavy metals in soils around a coal gangue heap with the APCS-MLR and PMF receptor models in Chongqing,southwest China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2023年第4期20卷 1061-1073页

作者： MA Jie sheN Zhi-jie WANG sheng-lan DENG Li SUN Jing LIU Ping she Ze-lei Chongqing Ecological and Environmental Monitoring Center Chongqing401147China Key Laboratory of Organic Pollutants in Environmental Chemical Behavior and Ecological Toxicology of Chongqing Chongqing401147China College of Resources and Environment Southwest UniversityChongqing400715China Chongqing University of Arts and Sciences Chongqing402160China

This study studied the characteristics and source apportionment of heavy metal pollution in the agricultural soil surrounding a gangue coal heap in Chongqing,China by using absolute principal component scores-multiple linear regression(APCSMLR)model and positive matrix factorization(PMF)*** applicability of the models was compared in the assessment of source *** results showed that the average contents of Cd,Hg,As,Pb,Cr,Cu,Ni,and Zn in the surface soil were 0.46,0.14,9.66,31.2,127,95.6,76.0,and 158 mg/kg,*** with the spatial distribution and correlation analyses,the results of source apportionment were consistent for both the APCSMLR and PMF ***,Hg,As,and Pb were mainly affected by the gangue heap accumulation,with respective contributions of 74.6%,79.4%,69.1%,and 67.2%based on the APCS-MLR model and respective contributions of 69.7%,60.7%,57.4%,and 41.9%based on the PMF *** and Zn were mainly affected by industrial and agricultural activities,while Cr and Cu were mainly affected by natural *** results of the source apportionment were approximately consistent between the APCS-MLR and PMF *** combined application of the two receptor models can make the results of source apportionment more comprehensive,accurate,and reliable.

关键词： Coal gangue heap Heavy metals Agricultural soil Source apportionment

松褐天牛肿腿蜂对小灰长角天牛幼虫和蛹的寄生研究

在线全文

学校读者我要写书评

暂无评论

生物灾害科学 2024年第2期47卷 213-217页

作者：曹平佘蕾王丽娜唐艳龙石和坤都昌县自然资源局江西九江332600 遵义市林业综合服务中心贵州遵义563002 遵义师范学院生物与农业科技学院/贵州省赤水河流域动物资源保护与应用研究重点实验室贵州遵义563002

【目的】为明确小灰长角天牛幼虫和蛹能否有效繁育松褐天牛肿腿蜂,使其成为高效的替代寄主。【方法】将松褐天牛肿腿蜂按照蜂虫1:1的比例接种到小灰长角天牛幼虫和蛹上,观察其能否产生子代,并记录子代发育情况统计及数量。【结果】用小... 详细信息

【目的】为明确小灰长角天牛幼虫和蛹能否有效繁育松褐天牛肿腿蜂,使其成为高效的替代寄主。【方法】将松褐天牛肿腿蜂按照蜂虫1:1的比例接种到小灰长角天牛幼虫和蛹上,观察其能否产生子代,并记录子代发育情况统计及数量。【结果】用小灰长角天牛幼虫和蛹繁育松褐天牛肿腿蜂时,寄生率分别为75%和85%,其中66.67%和70.59%的个体可繁育出肿腿蜂子代,两者无显著差异。松褐天牛肿腿蜂雌蜂产卵前期分别为8.53 d和7.94 d,子代卵历期分别为6.07 d和6.19 d,子代蛹历期分别为17.80 d和17.50 d,均无显著差异;子代幼虫历期分别为6.31 d和5.43 d,子代幼期历期分别为30.30 d和29.00 d,差异显著。用小灰长角天牛幼虫繁育时,子代雌蜂数量和子代总数分别为28.30头/管和29.70头/管,平均用蛹繁蜂时分别为25.50头/管和27.00头/管,比幼虫繁育时数量略低;平均子代雄蜂数分别为1.40头/管和1.50头/管;平均雄性比例分别为5.28%和5.71%,均无显著差异。【结论】小灰长角天牛幼虫和蛹均可有效繁育松褐天牛肿腿蜂。

关键词：松褐天牛肿腿蜂替代寄主发育历期子代数量

Facile fabrication of CdIn2S4/TiO2 heterojunction for enhanced solar light efficient CO2 reduction

在线全文

学校读者我要写书评

暂无评论

FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第9期18卷 105-105页

作者： Ma, Xiaoyu Wang, Longlong she, Houde Zhou, Yu Wang, lei Huang, Jingwei Wang, Qizhao Northwest Normal Univ Coll Chem & Chem Engn Lanzhou 730070 Peoples R China Changan Univ Sch Environm Sci & Engn Xian 710064 Peoples R China

Photocatalytic CO2 reduction is a promising solution to simultaneously provide renewable chemical fuels and address the greenhouse effect. However, designing practical photocatalysts with advanced architectures remains challenging. Herein, we report the preparation of a novel CdIn2S4/TiO2 binary heterojunction via an in situ solvothermal approach, which exhibits superior photocatalytic activity for sunlight-driven CO2 reduction. The CdIn2S4/TiO2 composites exhibit significantly enhanced photocatalytic performance for CO2 reduction compared to unmodified TiO2. Among them, the 3% CdIn2S4/TiO2 composite has optimal CO and CH4 evolution rates of 18.32 and 1.03 mu molg(-1)h(-1), respectively. The yield of CO is 4.7 times higher than that of pristine TiO2. This improved photocatalytic activity of the CdIn2S4/TiO2 heterostructure can be attributed to its large surface area, extended light absorption range and high separation efficiency of photogenerated electron-hole pairs, which are supported by the results of photoluminescence spectroscopy and the photoelectrochemical measurements. Moreover, the photocatalytic mechanism based on the binary CdIn2S4/TiO2 heterojunction is proposed and separation process of photogenerated electron-hole pairs is discussed. In brief, we aim to provide insights into the application of TiO2 in energy conversion processes through the construction of heterogeneous junctions.

关键词： TiO2 CdIn2S4 heterojunction photocatalytic CO2 reduction PHOTOCATALYTIC REDUCTION CONVERSION OXIDATION

Comprehensive treatment of thyroid-stimulating hormone(TSH)-secreting pituitary adenoma:one case report

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 Chinese-German Journal of Clinical Oncology 2010年第8期9卷 490-492页

作者： Hengzhu Zhang Xiaodong Wang Xian Zhang Yongkang Wu Lun Dong lei she Department of Neurosurgery Clinical Medical College Yangzhou University Yangzhou 225001 China

Thyroid-stimulating hormone(TSH)-secreting pituitary adenoma is a rare type in all pituitary *** we treated a TSH-secreting pituitary tumor in our *** patient had been treated for hyperthyroidism,in which methimazole had been prescribed for 10 years,but the symptoms had not been *** imaging demonstrated the typical features of a sellar tumor,and the diameter was approximately 2.7 *** on the laboratory studies:T3 at 6.27 nmol/L,T4 at 260.10 nmol/L,FT3 at 17.22 pmol/L,FT4 at 76.06 pmol/L,TSH at 9.93 Mu/L,the patient was diagnosed with a TSH-secreting pituitary tumor and central *** the patient was given octreotide for one week,he received resection of tumor via single-nostril transsphenoidal *** discharge,the patient received the radiation therapy two courses about 20 *** the comprehensive treatment of surgery,radiotherapy and drugs,the patient received a satisfactory result.

关键词： thyroid-stimulating hormone (TSH)-secreting pituitary adenoma treatment

遵义市林草湿生态系统外来入侵物种普查及分析

在线全文

学校读者我要写书评

暂无评论

生物灾害科学 2024年第1期47卷 1-6页

作者：徐志文任雪敏佘蕾叶晓红周玉梅黄珊雷林孙元烽周宇遵义市林业局贵州遵义563000 遵义市林业科学研究所贵州遵义563000

【目的】调查清楚遵义市林草湿生态系统外来物种入侵状况,为防控外来物种入侵提供参考。【方法】通过踏查、资料收集、查阅文献等方式对遵义市林草湿生态系统的外来入侵物种开展普查,分析了外来入侵生物的种类、发生面积、分布和风险等... 详细信息

【目的】调查清楚遵义市林草湿生态系统外来物种入侵状况,为防控外来物种入侵提供参考。【方法】通过踏查、资料收集、查阅文献等方式对遵义市林草湿生态系统的外来入侵物种开展普查,分析了外来入侵生物的种类、发生面积、分布和风险等级等情况。【结果】全市共布设5 948条踏查线路、长20 590.42 km,踏查覆盖率达20.68%;共普查到66科129属186种,生境总面积达242543.81km^(2)、发生面积达572.45 km^(2),其中19种外来入侵物种在全市各县均有分布;外来入侵植物种类最多,达到157种,占比高达84.41%;其次为25种外来入侵动物,占13.44%;最少为外来入侵病原微生物4种,占2.15%;I级高风险物种8种,占4.30%;II级中风险23种,占12.37%;III级低风险155种,占83.33%。【结论】此次普查摸清了遵义市林草湿生态系统的外来入侵物种分布及发生等情况,构建了外来入侵物种本底数据库,为研判入侵扩散机制、构建防控预警体系、制定防治策略等提供数据支撑,对生物多样性和生态环境保护及社会可持续发展具有重要作用。

关键词：遵义市外来入侵物种普查生态系统发生情况