检索结果-南通市图书馆

Implications of the cosmic infrared background excess for the cosmic star formation

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 1029-1034页

作者： tan WeiWei yu yunWei Institute of Astrophysics Central China Normal University

By phenomenologically describing the high-redshift star formation history, i.e., ,ρ.（z） oc [（1 ＋z）/4.5]-% and semi-analytically calculating the fractions of high-redshift Pop I/II and Pop II! stars, we investigate the contributions from both high-redshfit Pop I/II and Pop II/stars to the observed near-infrared （3 μm 〈// 〈 5 μm） excess in the cosmic infrared background emission. In order to account for the observational level of the near-infrared excess, the power-law index or of the assumed star formation history is constrained to within the range of 0 ≤a≤1. Such a constraint is obtained under the condition that the viral temperature of dark matter halos belongs to the range of 500 K ≤ Tvir≤ 104 K.

关键词： infrared background star formation dark matter

Analysis on Bicultural Identities of Chinese Americans Based on Acculturation Theory

在线全文

学校读者我要写书评

暂无评论

Sino-US English Teaching 2024年第6期21卷 280-285页

作者： WANG yu-qi University of Shanghai for Science and Technology ShanghaiChina

In the context of globalization,the communication between countries is gradually enhanced and the immigration is *** Americans,as a unique ethnic group,are easy to fall into the difficult problem of self-identity construction when facing the bicultural identity conflict between Chinese and *** paper selects the film The Farewell created by a Chinese American director as the research object,analyzes the cultural identity crisis of Chinese Americans,introduces the cultural adaption strategy adopted by Chinese Americans from the perspective of Acculturation Theory,and provides reference for Chinese Americans about how to realize the bicultural identities in the cultural diaspora.

关键词： acculturation Chinese Americans bicultural identities

Multi-USV Formation Collision Avoidance via Deep Reinforcement Learning and COLREGs

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

IEEE/CAA Journal of Automatica Sinica 2024年第11期11卷 2349-2351页

作者： Cheng-Cheng Wang yu-Long Wang Li Jia the Shanghai Key Laboratory of Power Station Automation Technology and also with the School of Mechatronic Engineering and Automation Shanghai University IEEE

Dear Editor,This letter focuses on the collision avoidance for a multi-unmanned surface vehicle(multi-USV) system. A novel multi-USV collision avoidance(MUCA) algorithm is proposed. Firstly, in order to get a more reasonable collision avoidance policy, reward functions are constructed according to international regulations for preventing collisions at sea(COLREGS) and USV dynamics.

关键词：

“化学键”核心概念的教学分析——基于知识发展、教材编排、学生认知的三序结合视角

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

化学教育（中英文） 2023年第13期44卷 75-81页

作者：谭宇凌钱扬义温金菊钟子婷朱潇行华南师范大学化学学院广东广州510006

“化学键”是中学化学教学中的核心概念之一,其有效教学是值得关注的话题。以学科知识发展、教材编排与学生认知发展的“三序结合”为研究视角,系统梳理“化学键”核心概念的教学内容,并构建“三序结合”教学模型。最后,基于“三序结合... 详细信息

“化学键”是中学化学教学中的核心概念之一,其有效教学是值得关注的话题。以学科知识发展、教材编排与学生认知发展的“三序结合”为研究视角,系统梳理“化学键”核心概念的教学内容,并构建“三序结合”教学模型。最后,基于“三序结合”对“化学键”核心概念教学提出相关建议。

关键词：化学键核心概念三序结合教学分析

Different processing methods and pharmacological effects of Atractylodis Rhizoma

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2024年第8期22卷 756-768页

作者： GUO Dongmei XU Kang WAN Qianyun yu Songyang MA Chaoyang ZHANG Baohui LIU Yanju QU Linghang College of Pharmacy Hubei University of Chinese MedicineWuhan 430065China Center for Hubei TCM Processing Technology Engineering Wuhan 430065China Hubei Shizhen Laboratory Wuhan 430065China

Atractylodis Rhizoma,a traditional Chinese medicine with an extensive history of treating gastrointestinal disorders and other diseases,undergoes various processing methods in China to enhance its therapeutic efficacy for specific ***,a comprehensive report detailing the changes in chemical composition and pharmacological effects due to these processing methods is currently *** article provides a systematic review of the commonly employed processing techniques for Atractylodis Rhizoma,including raw Atractylodis Rhizoma(SCZ),bran-fried Atractylodis Rhizoma(FCZ),deep-fried Atractylodis Rhizoma(JCZ),and rice water-processed Atractylodis Rhizoma(MCZ).It examines the alterations in chemical constituents and pharmacological activities resulting from these processes and elucidates the mechanisms of action of the primary components in the various processed forms of Atractylodis Rhizoma in the treatment of gastrointestinal diseases.

关键词： Atractylodis Rhizoma Processing method Pharmacological effect Change in chemical composition Gastrointestinal disease

在线全文

学校读者我要写书评

暂无评论

基于行车风险场的交通冲突风险预警方法

电子测量技术 2024年第6期47卷 1-7页

作者：薛先斌谭北海余荣钟武昌广东工业大学自动化学院广州510006 广东工业大学集成电路学院广州510006

城市交叉路口是交通事故多发路段,对于智能网联汽车来说,在行驶过程中进行风险检测与碰撞预警,从而保障驾驶的安全性至关重要。本文针对有信号灯的城市交叉路口提出一种考虑信号灯约束的行车风险场模型,并基于此模型设计三级碰撞预警方... 详细信息

城市交叉路口是交通事故多发路段,对于智能网联汽车来说,在行驶过程中进行风险检测与碰撞预警,从而保障驾驶的安全性至关重要。本文针对有信号灯的城市交叉路口提出一种考虑信号灯约束的行车风险场模型,并基于此模型设计三级碰撞预警方法。首先针对城市交叉路口的潜在冲突风险点构建功能场景,并将信号灯的约束作用考虑进行车风险场模型。为了解决碰撞预警问题,提出以TTC为指标划分三级冲突区域,通过计算主车行驶过程中周围对应的场强值,并根据干扰车在主车周围势能场的位置来衡量主车所受碰撞风险。实验结果表明,所设计的模型能够准确对进入主车势能场范围的干扰车进行预警,预警成功率可达100%,误报率仅为3.4%,证明所提方法的可靠性和有效性。

关键词：城市交叉路口智能网联汽车行车风险场风险检测碰撞预警

Genetic Analysis of Two Novel GPI Variants Disrupting H Bonds and Localization Characteristics of 55 Gene Variants Associated with Glucose-6-phosphate Isomerase Deficiency

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2024年第2期44卷 426-434页

作者： Bi-xin XI Si-ying LIU yu-ting XU De-dong ZHANG Qun HU Ai-guo LIU Department of Pediatrics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Objective:Glucose-6-phosphate isomerase(GPI)deficiency is a rare hereditary nonspherocytic hemolytic anemia caused by GPI gene *** disorder exhibits wide heterogeneity in its clinical manifestations and molecular characteristics,often posing challenges for precise diagnoses using conventional *** this end,this study aimed to identify the novel variants responsible for GPI deficiency in a Chinese ***:The clinical manifestations of the patient were summarized and analyzed for GPI deficiency phenotype *** compound heterozygous variants of the GPI gene,c.174C>A(***58Lys)and c.1538G>T(***513Leu),were identified using whole-exome and Sanger *** AlphaFold program and Chimera software were used to analyze the effects of compound heterozygous variants on GPI ***:By characterizing 53 GPI missense/nonsense variants from previous literature and two novel missense variants identified in this study,we found that most variants were located in exons 3,4,12,and 18,with a few localized in exons 8,9,and *** study identified novel compound heterozygous variants associated with GPI *** pathogenic variants disrupt hydrogen bonds formed by highly conserved GPI amino ***:Early family-based sequencing analyses,especially for patients with congenital anemia,can help increase diagnostic accuracy for GPI deficiency,improve child healthcare,and enable genetic counseling.

关键词： glucose-6-phosphate isomerase deficiency whole-exome sequencing compound heterozygous variants genetic characterization hydrogen bond

DNA metabarcoding analysis of fungal community on surface of four root herbs

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

Chinese Herbal Medicines 2024年第1期16卷 143-150页

作者： yujie Dao Jingsheng yu Meihua Yang Jianping Han Chune Fan Xiaohui Pang Institute of Medicinal Plant Development Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100193China

Objective: Angelicae Sinensis Radix(ASR, Danggui in Chinese), Cistanches Herba(CH, Roucongrong in Chinese), Ginseng Radix et Rhizoma(PG, Renshen in Chinese), and Panacis Quinquefolii Radix(PQ,Xiyangshen in Chinese), widely used as medicine and dietary supplement around the world, are susceptible to fungal and mycotoxin contamination. In this study, we aim to analyze their fungal community by DNA ***: A total of 12 root samples were collected from three main production areas in China. The samples were divided into four groups based on herb species, including ASR, CH, PG, and PQ groups. The fungal community on the surface of four root groups was investigated through DNA metabarcoding via targeting the internal transcribed spacer 2 region(ITS2).Results: All the 12 samples were detected with fungal contamination. Rhizopus(13.04%-74.03%),Aspergillus(1.76%-23.92%), and Fusarium(0.26%-15.27%) were the predominant genera. Ten important fungi were identified at the species level, including two potential toxigenic fungi(Penicillium citrinum and P. oxalicum) and eight human pathogenic fungi(Alternaria infectoria, Candida sake, Hyphopichia burtonii, Malassezia globosa, M. restricta, Rhizopus arrhizus, Rhodotorula mucilaginosa, and Ochroconis tshawytschae). Fungal community in ASR and CH groups was significantly different from other groups,while fungal community in PG and PQ groups was relatively ***: DNA metabarcoding revealed the fungal community in four important root herbs. This study provided an important reference for preventing root herbs against fungal and mycotoxin contamination.

关键词： Angelicae Sinensis Radix Cistanches Herba DNA metabarcoding fungi Ginseng Radix et Rhizoma ITS2 Panacis Quinquefolii Radix root herbs

High-brightness near-infrared luminescent bioprobes based on lanthanide-doped NaCrFnanoparticles

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年

作者： yun Xing Shiqi yu Datao Tu Xueyuan Chen State Key Laboratory of Structural Chemistry Fujian Key Laboratory of Nanomaterials and CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China University of Chinese Academy of Sciences

Over the past decade, near-infrared （NIR） luminescent materials have emerged as a frontier in photonics and material science, finding diverse applications in bioimaging, encryption,and photodetection[1]. Particularly, NIR nanoprobes are widely utilized in life science and clinical medicine because of their high spatial resolution, deep tissue penetration, low optical absorption and scattering, and minimal autofluorescence[2,3].

关键词：