检索结果-南通市图书馆

Identification of novel rodent and shrew orthohepeviruses sheds light on hepatitis E virus evolution

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2025年第01期 103-121页

作者： Fu-Li Li Bo Wang Pei-Yu Han Bei Li Hao-Rui Si Yan Zhu Hong-Min Yin Li-dong Zong Yi Tang Zheng-Li Shi Ben Hu Xing-Lou Yang Yun-zhi Zhang Institute of Preventive Medicine School of Public Health Dali University Yunnan Key Laboratory of Screening and Research on Antipathogenic Plant Resources from Western Yunnan Yunnan Key Laboratory of Zoonotic Disease Cross-border Prevention and Quarantine Second People's Hospital of Qujing Programme in Emerging Infectious Diseases Duke-NUS Medical School CAS Key Laboratory of Special Pathogens Wuhan Institute of Virology Chinese Academy of Sciences Key Laboratory of Genetic Evolution & Animal Models Yunnan International Joint Laboratory of Zoonotic Viruses Yunnan Key Laboratory of Biodiversity Information Kunming Institute of Zoology Chinese Academy of Sciences

The family Hepeviridae has seen an explosive expansion in its host range in recent years, yet the evolutionary trajectory of this zoonotic pathogen remains largely unknown. The emergence of rat hepatitis E virus(HEV)has introduced a new public health threat due to its potential for zoonotic transmission. This study investigated2 ?464 wild small mammals spanning four animal orders,eight families, 21 genera, and 37 species in Yunnan Province, China. Using broadly reactive reverse transcription-polymerase chain reaction(RT-PCR), we systematically screened the presence and prevalence of Orthohepevirus and identified 192 positive specimens from10 species, corresponding to an overall detection rate of7.79%. Next-generation sequencing enabled the recovery of 24 full-length genomic sequences from eight host species, including Bandicota bengalensis, Eothenomys eleusis, and Episoriculus caudatus, representing newly reported host species for Orthohepevirus *** and sequence analyses revealed extensive genetic diversity within orthohepeviruses infecting rodents and shrews. Notably, among the identified strains, 20 were classified as Rocahepevirus ratti C1, two as C3, and one as Rocahepevirus eothenomi, while the remaining strain exhibited significant divergence, precluding *** analyses highlighted close associations between orthohepeviruses and their respective host taxa,with distinct phylogenetic clustering patterns observed across different host orders. These findings emphasize the critical roles of co-speciation and cross-species transmission in shaping the evolutionary trajectories of the genera Paslahepevirus and Rocahepevirus.

关键词：

Frequency domain decision feedback equalizer for time-reversal space-time block coding

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2012年第1期19卷 38-43页

作者： dong Chao LIN Jia-ru NIU Kai HE zhi-qiang BIE zhi-song The Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China

In this paper, a frequency domain decision feedback equalizer is proposed for single carrier transmission with time-reversal space-time block coding （TR-STBC）. It is shown that the diagonal decision feedback equalizer matrix can be calculated from the frequency domain channel response. Under the perfect feedback assumption, the proposed equalizer can approach matched filter bound （MFB）. Compared with the existing time domain decision feedback equalizer, the proposed equalizer exhibits better performance with the same equalization complexity.

关键词： decision feedback equalization matched filter bound time-reversal space-time block coding (TR-STBC)

Synthesis and Characterization of a Novel Acrylonitrile Copolymer Containing Glucose Pendants

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2003年第2期14卷 151-154页

作者： dong Mei GUO Rui qiang KOU zhi Kang XU Institute of Polymer Science Zhejiang UniversityHangzhou 310027

In this work, a novel sugar-containing copolymer was synthesized by the copolymerization of a-allyl glucoside (AG) with acrylonitrile (AN). The copolymers were characterized by NMR spectroscopy. It was found that acrylonitrile-based copolymers containing as high as 22wt.% of a-allyl glucoside can be synthesized by the free radical solution copolymerization of the two monomers in DMSO with AIBN as initiator.

关键词： a-Allyl glucoside acrylonitrile copolymerization sugar-containing copolymer.

Effects of Zr Content on the Microstructures and Tensile Properties of Ti-3Al-8V-6Cr-4Mo-xZr Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 722-726页

作者： Hong-Bo Ba Li-Min dong zhi-qiang Zhang dong-Sheng Xu Rui Yang Institute of Metal Research Chinese Academy of Sciences School of Material Science and Engineering Liaoning University of Technology

The microstructural evolution and tensile properties of Ti-3Al-8V-6Cr-4Mo-xZr（x = 0,2,4 and 6） titanium alloys were *** precipitated phases and tensile fracture morphologies were observed using scanning electron microscopy and transmission electron *** results show that the presence of trace impurity Si and the addition of Zr induce the formation of（TiZr）_6Si_3 *** quantity of silicides increases with Zr content *** dispersed silicides refined the grain size of β Zr-containing alloys,and the grain size decreases significantly with Zr content *** these microstructural changes,the strength of the alloys is enhanced gradually with the increase of Zr content,which is attributed to the combination of precipitation strengthening and grain refinement.

关键词： Titanium alloy Microstructure Silicide Grain size Tensile properties

在线全文

学校读者我要写书评

暂无评论

采煤机联接框架焊接坡口的优化设计

煤矿机械 2017年第7期38卷 108-109页

作者：杨理昭高志强姜述栋李永岗西安煤矿机械有限公司西安710200

传统采煤机联接框架主要焊接坡口均设计为双J形坡口,坡口采用铣削加工。旨在讨论如何合理化设计采用双单边V形坡口替代原双J形坡口,简化坡口加工,实现单一车间内焊接,缩短加工周期,降低生产成本,提升经济效益。

关键词：采煤机联接框架双J形坡口双单边V形坡口焊接强度

面向青新市民住有宜居的城中村统租改造绩效评价及优化策略

在线全文

学校读者我要写书评

暂无评论

自然资源学报 2025年第1期40卷 195-210页

作者：仝德段司南邱君丽曹志强北京大学深圳研究生院城市规划与设计学院北京大学深圳研究生院超大城市空间治理政策模拟社会实验中心北京大学深圳研究生院北京大学未来城市实验室(深圳) 北京大学城市与环境学院

作为拆除重建改造方式的补充，以统租改造为代表的城中村微更新在各地兴起，旨在促进青新市民群体住有宜居，但其改造绩效尚未被系统解剖。以深圳为例，通过组间差异分析揭示统租改造的社会空间效应，并采用结构方程模型，对比统租公寓... 详细信息

作为拆除重建改造方式的补充，以统租改造为代表的城中村微更新在各地兴起，旨在促进青新市民群体住有宜居，但其改造绩效尚未被系统解剖。以深圳为例，通过组间差异分析揭示统租改造的社会空间效应，并采用结构方程模型，对比统租公寓和未改造私宅租客的居住偏好差异，从青新市民住有宜居视角评估统租改造的空间绩效。研究发现：（1）统租改造促使城中村从“低收入聚居区”向“青新市民宜居社区”转化；（2）统租公寓和未改造私宅租客存在明显的居住偏好差异，前者更偏好高品质且配套完善的安全居所，后者更需要布局合理且卫生的可支付居所。为推动城中村统租改造更好地满足青新市民的宜居需求，进一步从城市和社区层面提出统租改造优化策略。

关键词：城中村统租改造绩效评价居住偏好

Differential Cross Sections for the H＋D2O→HD＋OD Reaction： a Full Dimensional State-to-State Quantum Dynamics Study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2017年第1期30卷 16-24,I0001页

作者： zhi-qiang Zhao Shu Liu dong H. Zhang State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of Chinese Academy of Sciences Beijing 100049 China

The time-dependent wave-packet method was employed to calculate the first full-dimensional state-to-state differential cross sections （DCS） for the title reaction with D2O in the ground and the first symmetric （100） and asymmetric stretching （001） excited states. The calculated DCSs for these three initial states are strongly backward peaked at low collision energies. With the increase of collision energy, these DCSs become increasingly broader with the peak position shifting gradually to a smaller angle, consistent with the fact that the title reaction is a direct reaction via an abstraction mechanism. It is found that the （100） and （001） states not only have roughly the same integral cross sections, but also have essentially identical DCS, which are very close to that for the ground state at the same total energy of reaction. The reaction produces a small fraction of OD in the v=1 state, with the population close to the relative reactivity between the ground and vibrationally excited states, therefore confirming the experimental result of Zare et al. and the local mode picture [J. Phys. Chem. 97, 2204 （1993）]. Unexpectedly, the stretching excitation reduces the rotation excitation of product HD at the same total energy.

关键词： State-to-state Differential cross section Time-dependent wave-packet method

Synergistic Disinfection Effects of Dual-wavelength Ultraviolet and Its Impact on Photoreactivation and Dark Repair

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

Huanjing Kexue/Environmental Science 2025年第3期46卷 1443-1449页

作者： Zhou, Tian-Hong Liang, Yuan-Fu Sun, Zhe Li, Meng-Kai Wang, Jia-Le Li, Wen-Tao Ben, Wei-Wei Zhang, Guo-Zhen qiang, zhi-Min School of Environment and Municipal Engineering Lanzhou Jiaotong University Lanzhou730070 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Ultraviolet-C（UV-C）irradiation can effectively deactivate pathogenic microorganisms. The far UV-C（200-230 nm）and conventional UV-C（250-280 nm）can damage the proteins and nucleic acids of pathogenic microorganisms，respectively. The combination of far and conventional UV-C has the potential of synergistic inactivation. However，relevant studies remain limited owing to the lack of appropriate experimental setups. Therefore，this study established a mini-fluidic photoreaction system equipped with a KrCl excimer lamp and a low-pressure mercury lamp. This system could independently/simultaneously deliver stable 222 nm（far UV-C）and 254 nm（conventional UV-C）irradiations. Subsequently，the system was used to investigate the synergistic effect of dual-wavelength UV-C（the combination of 222 nm and 254 nm UV-C）on Escherichia coli（E. coli）inactivation and the subsequent impact on photo- and dark-reactivation. The results indicated that dual-wavelength UV-C had a significant synergistic effect on E. coli inactivation，with a synergistic coefficient up to 2.2. Additionally，comparing to 254 nm UV irradiation，the photo-reactivation of E. coli after dual-wavelength UV-C irradiation was weakened，with the maximum lg reactivation percentage reducing from 50.8% to 36.1%. Furthermore，E. coli after dual-wavelength UV-C irradiation exhibited dark decay，in which the inactivation efficiency was further enhanced during dark treatment. Therefore，these results suggest that dual-wavelength UV-C could inhibit the light reactivation and dark repair of E. coli，ensuring the water biosafety，as well as providing reference for the development of effective and safe water disinfection technologies. © 2025 Science Press. All rights reserved.

关键词： Escherichia coli

Batch process monitoring based on multilevel ICA-PCA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1061-1069页

作者： zhi-qiang GE zhi-huan SONG State Key Lab of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou 310027 China

In this paper, we describe a new batch process monitoring method based on multilevel independent component analysis and principal component analysis (MLICA-PCA). Unlike the conventional multi-way principal component analysis (MPCA) method, MLICA-PCA provides a separated interpretation for multilevel batch process data. Batch process data are partitioned into two levels: the within-batch level and the between-batch level. In each level, the Gaussian and non-Gaussian components of process information can be separately extracted. I2, T2 and SPE statistics are individually built and monitored. The new method facilitates fault diagnosis. Since the two variation levels are decomposed, the variables responsible for faults in each level can be identified and interpreted more easily. A case study of the Dupont benchmark process showed that the proposed method was more efficient and interpretable in fault detection and diagnosis, compared to the alternative batch process monitoring method.

关键词： Multilevel Independent component analysis (ICA) Principal component analysis (PCA) Batch process monitoring Non-Gaussian