检索结果-南通市图书馆

Different sperm sources and parameters can influence intracytoplasmic sperm injection outcomes before embryo implantation

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

Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2012年第1期13卷 1-10页

作者： Yue-hong LU1,2, Hui-juan GAO1, Bai-jia LI1, Ying-ming ZHENG1, Ying-hui YE1, Yu-li QIAN1, Chen-ming XU1, He-feng HUANG1, Fan JIN1 (1Department of Reproductive Endocrinology, Key Laboratory of Reproductive Genetics, Ministry of Education, and Key Laboratory of Women’s Reproductive Health of Zhejiang Province, Women’s Hospital, school of Medicine, Zhejiang University, Hangzhou 310006, China) (2Department of Reproductive Health, shaoxing Women and Children Hospital, shaoxing 312000, China) Department of Reproductive Endocrinology Key Laboratory of Reproductive Genetics Ministry of Education and Key Laboratory of Women's Reproductive Health of Zhejiang Province Women's Hospital School of Medicine Zhejiang University Hangzhou 310006 China

To evaluate the effects of sperm with different parameters and sources on the outcomes of intracytoplasmic sperm injection (ICsI), 1972 ICsI cycles were analyzed retrospectively. Groups.1 to 5 were composed of cycles using ejaculated sperm and were grouped according to sperm quantity, quality, and morphology into normal (288 cycles), or mild (329 cycles), moderate (522 cycles), severe (332 cycles), and extremely severe (171 cycles) oligozoospermia and/or asthenozoospermia and/or teratozoospermia (OAT) groups. Group 6 was composed of 250 cycles using testicular or epididymal sperm, and Group 7 consisted of 80 cycles using frozen-thawed sperm. We found that fertilization rates were gradually reduced from Groups.1 to 6, and reached statistical difference in Groups 5 and 6 (Ps higher in Group 1 than in Groups 2, 3, 5, 6, and 7 (Pstatistical differences were observed in the rates of embryo cleavage, clinical pregnancy, miscarriage, live-birth, premature birth, low birth weight, weeks of premature birth, average birth weight, or sex ratio for all seven groups (P>0.05). A total of nine cases of malformation were observed, with a malformation rate of 1.25% (9/719). In conclusion, different sperm sources and parameters can affect ICsI outcomes before embryo implantation. A full assessment of offspring mal-formation will require further study using a larger sample size.

关键词： Intracytoplasmic sperm injection (ICsI)i sperm sperm source sperm parameters Malformation

An experimenal analysis for the impact of 2D variation assimilation of satellite data on typhoon track simulation

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica sinica 2003年第4期22卷 511-522页

作者： Xie Hongqin1, Wu Zengmao1, Gao shanhong1 1.Institute of Physical Oceanography, Ocean University of China, Qingdao 266003, China Ocean Univ China Inst Phys Oceanog Qingdao 266003 Peoples R China

A series of test simulations are performed to evaluate the impact of satellite-derived meteorological data on numerical typhoon track prediction. Geostationary meteorological satellite (GMs-5) and NOAA's TIROs operational vertical sounder (TOVs) observations are used in the experiments. A two-dimensional variation assimilation scheme is developed to assimilate the satellite data directly into the Penn state-NCAR nonhydrostatic meteorological model (MM5). Three-dimensional objective analyses fields based on T213 results and routine observations are employed as the background fields of the initialization. The comparisons of the simulated typhoon tracks are also carried out, which correspond respectively to the initialization scheme with two-dimensional variation (2D - Var), three-dimensional observational nudging and direct assimilation of satellite data. It is found that, comparing with the experiments without satellite data assimilation, the first two assimilation schemes lead to significant improvements on typhoon track prediction. Track errors reduce by 18 % at 12 h for 2D - Var and from about 16 % at 24 h to about 35 % at 48 h for observational nudging. The simulated results based on assimilating different kinds of satellite data are also compared.

关键词： 2D-Var assimilation satellite data observational nudging direct assimilation

Bioreducible crosslinked low molecular weight branched PEI-PBLG as an efficient gene carrier

在线全文

学校读者我要写书评

暂无评论

science China Chemistry 2010年第12期53卷 2490-2496页

作者： GUO ZhaoPei 1,TIAN HuaYu 1,XIA JiaLiang 1,2,CHEN Jie 1,LIN Lin 1 & CHEN Xuesi 1 1 Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry,Chinese Academy of sciences,Changchun 130022,China 2 Graduate University of Chinese Academy of sciences,Beijing 100049,China 1. Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

Low molecular weight polyethylenimine-poly(gamma-benzyl L-glutamate) (PEI-PBLG) was crosslinked by N,N'-cystaminebisacrylamide (CBA) to get the polymer named as CBA-PEI-PBLG (CPP).CPP not only inherits PEI-PBLG's amphiphilic advantages,but also possesses reducible *** can complex with DNA to form ***/DNA complex particles were characterized by particle size and zeta potential *** result showed that the complex particles have suitable size and surface charges for gene *** gel retardation assay also prove CBA-PEI-PBLG has proper condensing ability for *** has good reducible property,and also has good biocompatibility because of introducing PBLG *** cytotoxicity of CPP was evaluated using MTT assay,and the results showed CPP has lower cytotoxicity compared with PEI 25 *** transfection properties were characterized in different cells by using plasmid DNA as a *** showed higher transfection efficiencies and lower cytotoxicity in HeLa *** was attributed to bioreducible and biocompatibility properties of the *** results suggested that CPP is a promising low-toxic,highly effective non-viral gene carrier.

关键词： gene carrier transfection cytotoxicity crosslinked

stimulus responsive fluorescent hyperbranched polymers and their applications

在线全文

学校读者我要写书评

暂无评论

science China Chemistry 2010年第12期53卷 2409-2428页

作者： WANG Jian 1,MEI Ju 1,QIN AnJun 1,sUN JingZhi 1 & TANG Ben Zhong 1,2 1 MOE Key Laboratory of Macromolecular synthesis and Functionalization Department of Polymer science and Engineering,Institute of Biomedical Macromolecules,Zhejiang University,Hangzhou 310027,China 2 Department of Chemistry,The Hong Kong University of science & Technology,Hong Kong,China 1. MOE Key Laboratory of Macromolecular synthesis and Functionalization Department of Polymer science and Engineering Institute of Biomedical Macromolecules Zhejiang University Hangzhou 310027 China2. Department of Chemistry The Hong Kong University of Science & Technology Hong Kong China

Fluorescent hyperbranched polymers (FHBPs),which combine the versatile fluorescent property with unique characteristics of hyperbranched architecture,are desirable candidates for stimulus responsive *** review demonstrates the structure and environment-dependent emission behaviors of a series of *** active FHBPs showing opposite performance to ACQ effect are used to sensitively detect explosives and a superamplification effect is *** designed FHBPs can complex with metal ions,leading to fluorescence turn-off due to complex quenching *** protonation of amino-containing FHBPs exhibits pH-dependent fluorescence responses to solution *** FHBPs containing responsive moieties are photo-and thermo-sensitive,and show potential applications as smart materials.

关键词： fluorescent hyperbranched polymer explosives and metal ions detection pH responsive optical and thermal sensitive

Estimation and Correction of Model Bias in the NAsA/GMAO GEOs5 Data Assimilation system:sequential Implementation

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric sciences 2016年第6期33卷 659-672页

作者： Banglin ZHANC Vijay TALLAPRAGADA Fuzhong WENG Jason s1PPEL Zaizhong MA LM.system Group Inc.College ParkMD 20740USA NOAA NCEP Environmental Modeling Center College ParkMD 20740USA NOAA Center for satellite Applications and Research College ParkMD 20740USA NOAA Joint Center for satellite Data Assimilation College ParkMD 20740USA

This study presents a simplified multivariate bias correction scheme that is sequentially implemented in the GEOs5 data assimilation system and compared against a control experiment without model bias correction. The results show considerable improvement in terms of the mean biases of rawinsonde observation-minus-background （OmB） residuals for observed water vapor, wind and temperature variables. The time series spectral analysis shows whitening of bias-corrected OmB residuals, and mean biases for rawinsonde observation-minus-analysis （OmA） are also improved. some wind and temperature biases in the control experiment near the equatorial tropopause nearly vanish from the bias-corrected experiment. Despite the analysis improvement, the bias correction scheme has only a moderate impact on forecast skill. significant interaction is also found among quality-control, satellite observation bias correction, and background bias correction, and the latter positively impacts satellite bias correction.

关键词： data assimilation model bias estimation and correction

solution‑Processed Thin Film Transparent Photovoltaics:Present Challenges and Future Development

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 566-600页

作者： Tianle Liu Munerah M.s.Almutairi Jie Ma Aisling stewart Zhaohui Xing Mengxia Liu Bo Hou Yuljae Cho UM-sJTU Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China school of Physics and Astronomy Cardiff UniversityCardiff CF243AAWalesUK Department of Electrical and Computer Engineering Yale UniversityNew HavenCT 06511USA Energy sciences Institute Yale UniversityWest HavenCT 06516USA Future Photovoltaics Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Electrical energy is essential for modern society to sustain economic *** soaring demand for the electrical energy,together with an awareness of the environmental impact of fossil fuels,has been driving a shift towards the utilization of solar ***,traditional solar energy solutions often require extensive spaces for a panel installation,limiting their practicality in a dense urban *** overcome the spatial constraint,researchers have developed transparent photovoltaics(TPV),enabling windows and facades in vehicles and buildings to generate electric *** TPV advancements are focused on improving both transparency and power output to rival commercially available silicon solar *** this review,we first briefly introduce wavelength-and non-wavelengthselective strategies to achieve *** of merit and theoretical limits of TPVs are discussed to comprehensively understand the status of current TPV *** we highlight recent progress in different types of TPVs,with a particular focus on solution-processed thin-film photovoltaics(PVs),including colloidal quantum dot PVs,metal halide perovskite PVs and organic *** applications of TPVs are also reviewed,with emphasis on agrivoltaics,smart windows and ***,current challenges and future opportunities in TPV research are pointed out.

关键词： Transparent semiconductors solution-processable transparent solar cell Emerging solar cell materials Buildingintegrated photovoltaics

Kinetics of Desilification Pretreatment from High-aluminium Coal Fly Ash in Alkaline Medium Under Pressure

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2017年第2期33卷 282-286页

作者： Min Lu (1) Yanwei Chang (1) Long Chen (2) 1. school of Chemical Engineering Northeast Electric Power University Jilin 132012 P. R. China 2. Department of Environmental and Occupational Health School of Public Health Texas A&M University Texas 77843-1266 USA

In this paper, desilification for high-aluminium coal fly ash in alkaline media under pressure was reportedto improve the efficiency of sodium leaching. Factors such as the alkaline quantity, reaction temperature, time andliquid-to-solid ratio on desilification were studied in detail. At the same time, the kinetics of desilification were ana-lysed to further reveal the leaching mechanism. The results showed that the alkaline quantity, reaction temperatureand liquid-to-solid ratio had significant effects on the desilification efficiency with increasing reaction time. Themaximum siO2 leaching rate was 65.78% under the optimal experimental conditions. According to the shrinking coremodel, the process of leaching is controlled by surface chemical reactions in the earlier stage and diffusion of thesolid layer in the later stage.

关键词： Kinetics 15igh-aluminium coal fly ash Pressure Desilification Alkaline medium

Nonlinear Optical Properties in Bismuth-based Glasses

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

Journal of Wuhan University of Technology(Materials science) 2011年第1期26卷 61-64页

作者：章健良 Faculty of Information science and Engineering The State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo University People's Liberation Army with Number of 91428

A series of glasses with high Bi2O3 content of Bi2O3-B2O3-WO3 ternary system were chosen and prepared .Their densities and linear refractive indices increase with increasing WO3 content. The optical band gaps Eopt of glasses obtained from ultraviolet absorption edges decreases with increase of WO3 content. Z-scan technique was carried out to investigate the third-order nonlinear optical properties of the glasses. It is found that the nonlinear refraction γ increases with decreasing the optical band gap Eopt, since an increase of WO3 content can promote the non-bridging oxygen ion content, and the highest γ value of samples is.1.173×10-14 cm2/W. The results show that these glasses are potential materials in the application of third-order nonlinear optics field.

关键词： bismuth glasses optical band gap third-order nonlinear Z-scan

Effect of B alloying on magnetocaloric effect of Gd5.1si2Ge2 alloy in low magnetic field

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:Materials International 2011年第5期21卷 413-417页

作者： Xue-ling HOU~(1,2),Xiang JIE~1,Jian HUANG~1,Zhi ZENG~1,Hui-min HU~1,Guan-chang ZHANG~1,Hui XU~(1,2) 1.Institute of Materials science,shanghai University,shanghai 200072,China 2.Laboratory for Microstructures,shanghai University,shanghai 200072,China [a] Institute of Materials science Shanghai University Shanghai 200072 China [b] Laboratory for Microstructures Shanghai University Shanghai 200072 China

A series of the Gd5.1si2Ge2-xBx,alloys were prepared with arc melting in purified argon *** effect of B addition on the magnetocaloric effect of compound Gd5si2Ge2was investigated by powder X-ray diffraction technology and DsC and direct magnetocaloric effect apparatus and vibrating sample magnetometer（VsM）.The results show that the addition of a small amount of B maintains the Gd5si2Ge2compound in single monoclinic phase with superior magnetocaloric effect,especially when x=0.01,the maximum magnetic entropy change（|△sM|） reaches the values of 13.7 J/（kg·K） at 288 *** 1.5 T magnetic *** the increase of B content,some orthorhombic Gd5si4-type phases appear in the matrix of monoclinic Gd5si2Ge2-type phase in Gd5.1si2-xGe2Bxalloys.

关键词： B-doping Gd5.1si2Ge2 crystal structure magnetocaloric effect adiabatic temperature change magnetic entropy change