检索结果-南通市图书馆

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第6期10卷 465-471页

作者： Li-juan XIE yi-bin yiNG College of Biosystems Engineering and Food Science Zhejiang University Hangzhou 310029 China

Near-infrared (NIR) transmittance spectroscopy combined with least-squares support vector machine (LS-SVM) was investigated to study the quality change of tomato juice during the storage. A total of 100 tomato juice samples were used. The spectrum of each tomato juice was collected twice: the first measurement was taken when the tomato juice was fresh and had not undergone any changes, and the second measurement was taken after a month. Principal component analysis (PCA) was used to examine a potential capability of separating juice before and after the storage. The soluble solid content (SSC) and pH of the juice samples were determined. The results show that changes in certain compounds between tomato juice before and after the storage period were obvious. An excellent precision was achieved by LS-SVM model compared with discriminant partial least-squares (DPLS), soft independent modeling of class analogy (SIMCA), and discriminant analysis (DA) models, with 100% of a total accuracy. It can be found that NIR spectroscopy coupled with LS-SVM, DPLS, SIMCA, and DA can be used to control the quality change of tomato juice during the storage.

关键词： Near-infrared (NIR) spectroscopy Least squares-support vector machine (LS-SVM) Quality change Tomato juice

Translating Solutions of the Nonparametric Mean Curvature Flow with Nonzero Neumann Boundary Data in Product Manifold M^(n)×R^(*)

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2022年第4期43卷 601-620页

作者： Ya GAO yi-juan GONG Jing MAO Faculty of Mathematics and Statistics Key Laboratory of Applied Mathematics of Hubei ProvinceHubei UniversityWuhan 430062China

In this paper,the authors can prove the existence of translating solutions to the nonparametric mean curvature flow with nonzero Neumann boundary data in a prescribed product manifold M^(n)×R,where M^(n) is an n-dime... 详细信息

关键词： Translating solutions Singularity Nonparametric mean curvature flow Convexity Ricci curvature

Substitution Effects on MgB2 Superconductivity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第2期49卷 504-506页

作者： LIU juan ZHAO Yuan yi Lin Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

With the help of supercell method, the first-principle calculations were performed for the study of doping crystal Mg1-xAlxB2 and Mg（B1-yCy）2. Analyzing the variations of the charge distribution and the partial densities of states, we found that the compounds with doping Al to MgB2 compound and/or replacing boron by carbon exhibit new covalent bond effects and unexpected electronic properties, related to superconductivity. The study of the density of states indicates that superconductivity decreases with the increase of Al fraction and carbon concentration. There exists a transition of superconductor to non-superconductor with the change of Al doping fraction. The substitution of boron by carbon results in the decrease of the transition temperature since the decrease of the electron concentration and the lattice constant. The theoretical predictions agree with experimental observations.

关键词： superconductivity first-principles calculations density of states

First record of the little fire ant,Wasmannia auropunctata(Hymenoptera:Formicidae),in Chinese mainland

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2022年第6期21卷 1825-1829页

作者： CHEN Si-qi ZHAO yi LU Yong-yue RAN Hao XU yi-juan Red Imported Fire Ant Research Center South China Agricultural UniversityGuangzhou 510642P.R.China

In January 2022,we received ant specimens collected from three field colonies from Shantou City,Guangdong Province,*** were identified as the little fire ant,Wasmannia auropunctata,through morphological and molecular *** auropunctata is listed as one of the 100 most dangerous invasive species by the International Union for Conservation of Nature(IUCN)and has spread from its native range in South America to every continent except *** analysis of mitochondrial cytochrome c oxidase subunit I(COI)in nine specimens of *** found that they had a close genetic relationship with specimens from *** study represents the first formal record of the establishment of *** outdoor in Chinese ***,the invasion stage and occurrence degree of *** in China are not clear to *** implementation of quarantine measures,investigation of the occurrence and distribution,and development of monitoring and control strategies are needed to actively respond to the threat posed by this highly invasive ant.

关键词： little fire ant morphological identification mitochondrial cytochrome c oxidase subunit I

Impact of the red imported fire ant Solenopsis invicta Buren on biodiversity in South China: A review

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第4期18卷 788-796页

作者： WANG Lei XU yi-juan ZENG Ling LU Yong-yue Red Imported Fire Ant Research Centre South China Agricultural University

The red imported fire ant, Solenopsis invicta, is a problematic invasive species in China since at least 2003. Over the past 15 years, a numerous studies were published on the impacts of this species on flora, fauna, and ecosystem function in natural and agricultural systems. We reviewed the literature on S. invicta invasion biology and impacts on biodiversity in South China. Both monogyne and polygyne colonies of S. invicta were introduced to China and polygyne colony is the dominant type. The range expansion rate of S. invicta may reach 26.5–48.1 km yr–1 in China. S. invicta forage activities occur year-round, peaking in the summer and fall in South China and show a preference for insects and plant seeds. We describe the ecological impacts of S. invicta on various habitats in South China, including arthropod community structure disruption and decreases in diversity and abundance of native ant species. S. invicta can replace the role of native ants in mutualisms between ants and honeydew-producing Hemiptera, which results in loss of important food resources for native ants and natural enemies of hemipterans. Further research is required to assess the complex ecosystem-level impacts of S. invicta in introduced areas.

关键词： fire ant biology behavior ecosystem function non-native invasion

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第6期13卷 24-29页

作者： Wen-Jin Yuan yi-juan Zheng Bing-Rong Zhang yi-Jie Lin You Li Yan-Yan Qiu Xue-Ping Yu Department of Infection Disease Clinical Medical Research Center for Bacterial and Fungal Infectious Diseases of Fujian provinceFujian Medical University Affiliated First Quanzhou HospitalQuanzhou 362000Fujian ProvinceChina

BACKGROUND Hydroxyurea,an antimetabolite,is frequently prescribed for various hemato-logical disorders,and its common side effects include gastrointestinal problems,cutaneous or mucosal lesions and pyrexia/*** SUMMARY This study reports the case of a 67-year-old woman who developed recurrent abdominal pain after 10 years of continuous hydroxyurea therapy for primary *** revealed an ileocecal *** discontinuing hydroxyurea therapy for 6 months,follow-up colonoscopy showed a significant reduction in the *** We consider cecal ulcers as a rare complication of hydroxyurea therapy which typically resolves upon stopping the drug.

关键词： Hydroxyurea Ulcer Abdominal pain Thrombocythemia Colonoscopy Case report

Sperm chromatin structure assay results after swim-up are related only to embryo quality but not to fertilization and pregnancy rates following IVF

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

Asian Journal of Andrology 2011年第6期13卷 862-866页

作者： Zhi-Hong Niu Hui-juan Shi Hui-Qin Zhang Ai-Jun Zhang yi-juan Sun Yun Feng IVF Unit Department of Obstetrics and Gynecology Ruijin Hospital Affiliated to Shanghai Jiao Tong University Shanghai 200025 China Shanghai Institute of Planned Parenthood Research Shanghai 200032 China

The aim of this study was to investigate whether the sperm chromatin structure assay （SCSA） results after swim-up are related to fertilization rates, embryo quality and pregnancy rates following in vitrofertilization （IVF）. A total of 223 couples undergoing IVF in our hospital from October 2008 to September 2009 were included in this study. Data on the IVF process and sperm chromatin structure assay results were collected. Fertilization rate, embryo quality and IVF success rates of different DNA fragmentation index （DFI） subgroups and high DNA stainability （HDS） subgroups were compared. There were no significant differences in fertilization rate, clinical pregnancy or delivery rates between the DFI and HDS subgroups. However, the group with abnormal DFI had a lower good embryo rate. So, we concluded that the SCSA variables, either DFI or HDS after swim-up preparation, were not valuable in predicting fertilization failure or pregnancy rate, but an abnormal DFI meant a lower good embryo rate following IVF.

关键词： embryo fertilization in-vitro fertilization sperm chromatin structure assay

Achieving Total Enteroscopy by Consecutive Bidirectional Doubleballoon Enteroscopy Procedures

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

Current Medical Science 2022年第1期42卷 144-149页

作者： Liang ZHAO An-ning yiN Fei LIAO yi-juan DING Hong-gang YU Department of Gastroenterology Renmin Hospital of Wuhan UniversityWuhan 430060China

Objective:To investigate the feasibility and safety of achieving total enteroscopy by consecutive bidirectional double-balloon enteroscopy(DBE)***:The demographic data,indication,initial insertion route,examination time for each insertion and the entire procedure,total enteroscopy rate,diagnostic yield and adverse events of patients who attempted to achieve total enteroscopy by consecutive bidirectional DBE procedures from January 2014 to December 2019 were retrospectively analyzed.

关键词： double-balloon enteroscopy feasibility safety total enteroscopy

Characterization of CeO_(2)microspheres fabricated by an ultrasonic spray pyrolysis method

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 2021年第1期40卷 31-39页

作者： Shou-Feng Xue yi-juan Li Feng-Hua Zheng Xue Bian Wen-Yuan Wu Cheng-Hao Yang Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research InstituteSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Institute of Metallurgy Northeastern UniversityShenyang 110000China

CeO_(2) is one of the main catalysts for solid oxide fuel cell(SOFC).It is critical to find a green and costeffective fabrication method for CeO_(2) at *** this study,the CeO_(2) microspheres were prepared by one-step ultrasonic spray pyrolysis of cerium chloride solution at700℃.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)study demonstrate that the prepared CeO_(2) microspheres exhibit a particle size of0.01-1.08μm with a mean particle size of 0.23μm,and more than 94%of the particles have a diameter less than0.5μ*** the presence of residual Cl in the fabricated CeO_(2) microspheres blocks the active sites and leads to the significant degradation of SOFC *** formation mechanism and distribution of residual Cl in the fabricated CeO_(2) microspheres were systemic ally *** water washing method was shown to effectively reduce the residual Cl in the CeO_(2) ***,this work provides a clean manufacturing process for the preparation of SOFC electrode/electrolyte materials.

关键词： CeO_(2) Residual chlorine Ultrasonic spray pyrolysis

Influence of Iron Ore Characteristics on FeO Formation During Sintering

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第5期18卷 5-10页

作者： WU Sheng-li WANG Qing-feng BIAN Miao-lian ZHU juan LONG Fang-yi School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of iron ore characteristics on FeO formation during sintering was examined mainly in terms of chemical composition and the melting characteristics of iron ores. Statistical regression and X-ray diffraction were used to further explain the specific effect of iron ore characteristics on FeO formation. The results indicate that LOI （loss on ignition） in iron ores have a positive influence on FeO formation by promoting the sintering process of Fe2O3 decomposing and reducing. Silica contents in iron ores play a determining role in final content of FeO in sinter. The melting characteristics of iron ores significantly affect FeO formation during sintering.

关键词： iron ore characteristic chemical composition melting characteristic FeO formation