检索结果-南通市图书馆

Epigenomic features associated with body temperature stabilize tissues during cold exposure in cold-resistant pigs

Journal of Genetics and Genomics 2024年第11期51卷 1252-1264页

作者： Yaping Guo Mingyang Hu Hao Peng Yan Zhang Renzhuo Kuang zheyu han Daoyuan Wang Yinlong Liao Ruixian Ma Zhixiang Xu Jiahao Sun Yu Shen Changzhi Zhao Hong Ma Di Liu Shuhong Zhao Yunxia Zhao Key Laboratory of Agricultural Animal Genetics Breedingand Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of Ministry of AgricultureHuazhong Agricultural UniversityWuhanHubei 430070China Yazhouwan National Laboratory SanyaHainan 572000China Institute of Animal Husbandry Heilongjiang Academy of Agricultural SciencesHarbinHeilongjiang 150086China The Cooperative Innovation Center for Sustainable Pig Production WuhanHubei 430070China

Cold stress in low-temperature environments can trigger changes in gene expression,but epigenomics regulation of temperature stability in vital tissues,including the fat and diencephalon,is still ***,we explore the cold-induced changes in epigenomic features in the diencephalon and fat tissues of two cold-resistant Chinese pig breeds,Min and Enshi black(ES)pigs,utilizing H3K27ac CUT&Tag,RNA-seq,and selective signature *** results show significant alterations in H3K27ac modifications in the diencephalon of Min pigs and the fat of ES pigs after cold *** changes in H3K27ac modifications in the diencephalon of Min pig are primarily associated with genes involved in energy metabolism and hormone regulation,whereas those in the fat of ES pig are primarily associated with immunity-related ***,transcription factors PRDM1 and HSF1,which show evidence of selection,are enriched in genomic regions presenting cold-responsive alterations in H3K27ac modification in the Min pig diencephalon and ES pig fat,*** results indicate the diversity of epigenomic response mechanisms to cold exposure between Min and ES pigs,providing unique epigenetic resources for studies of low-temperature adaptation in large mammals.

关键词： Cold exposure Diencephalon tissue Fat tissue H3K27ac modification Breed difference Multi-omics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

构树青贮饲料开发利用技术研究进展

引用

动物营养学报 2021年第9期33卷 4898-4908页

作者：韩哲宇毕小兵史海涛李胜利西南民族大学畜牧兽医学院成都610041 青藏高原动物遗传资源保护与利用教育部重点实验室成都610041 中国农业大学动物科学技术学院动物营养学国家重点实验室北京100193

构树(Broussonetia papyrifera)为桑科构树属落叶乔木,其生长速度快、蛋白质含量高,具备开发为新型蛋白质饲料的潜力。此外,构树含有的黄酮、生物碱等生物活性成分可对动物健康发挥特殊的功能性作用。合理的加工和保存方式有助于推动构... 详细信息

构树(Broussonetia papyrifera)为桑科构树属落叶乔木,其生长速度快、蛋白质含量高,具备开发为新型蛋白质饲料的潜力。此外,构树含有的黄酮、生物碱等生物活性成分可对动物健康发挥特殊的功能性作用。合理的加工和保存方式有助于推动构树的饲料化应用,而青贮是保存构树营养价值的有效途径。本文在广泛查阅近年来国内外公开发表的与构树青贮相关的文献的基础上,对具有代表性的研究进行归类和分析,总结了构树的营养成分含量和消化利用特性,梳理了影响构树青贮品质的因素,以期为提高构树青贮的营养价值、促进构树在养殖业中的应用提供参考。

关键词：构树粗饲料青贮营养价值

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于初始电流行波相位的多端混合直流线路单端保护方案

引用

高电压技术 2024年第2期50卷 649-659,I0003-I0010页

作者：戴志辉牛宝仪邱宏逸奚潇睿韩哲宇韦舒清华北电力大学电气与电子工程学院保定071000 国网浙江余姚市供电有限公司宁波315000

为了解决LCC-MMC型多端混合直流系统线路保护存在的问题,提出一种基于初始电流行波相位的多端混合直流线路单端保护方案。首先基于多端混合直流输电线路发生不同位置和类型的故障工况,推导直流线路入射电压行波的解析式并计算其高频段... 详细信息

为了解决LCC-MMC型多端混合直流系统线路保护存在的问题,提出一种基于初始电流行波相位的多端混合直流线路单端保护方案。首先基于多端混合直流输电线路发生不同位置和类型的故障工况,推导直流线路入射电压行波的解析式并计算其高频段相位。其次结合线路边界行波折反射原理和测量波阻抗特性,提出利用初始电压行波相位的区内外识别判据,并根据雷击和短路故障的入射行波低频相位特性构建雷击干扰判据。在PSCAD/EMTDC中搭建昆柳龙多端混合直流系统模型进行验证,证明所提方案仅利用单端量信息即可满足故障判断和选线要求,满足速度性的同时具备一定的抗过渡电阻能力(500Ω)。

关键词：多端混合直流电流行波相位线路故障 S变换单端量保护

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

混合多端直流输电系统限流控制策略配合及限流参数全局优化

引用

电工技术学报 2024年第11期39卷 3323-3338页

作者：李杭泽戴志辉韩哲宇奚潇睿牛宝仪杨明玉新能源电力系统全国重点实验室(华北电力大学) 保定071003

混合多端直流输电系统短路电流水平超标对其安全稳定运行造成极大威胁。现有通过控制策略限流的方法多以本站出口侧最严重的极间故障展开分析,忽略了过渡电阻对两侧系统的耦合作用,且控制参数的不合理配置会降低故障点非零电位大小,进... 详细信息

混合多端直流输电系统短路电流水平超标对其安全稳定运行造成极大威胁。现有通过控制策略限流的方法多以本站出口侧最严重的极间故障展开分析,忽略了过渡电阻对两侧系统的耦合作用,且控制参数的不合理配置会降低故障点非零电位大小,进而加剧线路过电流现象。为此,首先,阐述了混合多端直流输电系统常见控制限流策略;其次,对换流站自身的控制特性及站间交互作用对故障电流的影响机理展开分析,提出计及过渡电阻耦合作用下故障电流的计算方法;然后,在此基础上,综合考虑控制参数灵敏性、限流效果等约束,建立控制参数全局优化数学模型,通过层次分析法得到控制参数的最优解;最后,基于PSCAD/EMTDC对传统限流特性及全局优化下的限流特性进行对比分析。结果表明,所提方法能在提高限流效果及满足参数灵敏性的基础上更好地适应经过渡电阻故障的情况,降低故障时电流上升率和电流峰值,协助降低两侧换流站因增流现象加剧线路过电流情况而闭锁的概率。

关键词：主动限流控制低压限流混合多端直流输电过渡电阻参数优化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

计及联络开关投切的有源配网电流速断保护定值优化方案

引用

中国电力 2024年第10期57卷 90-101页

作者：程诺陈大才陈雪阮筱菲韦舒清韩哲宇国网福建省电力有限公司经济技术研究院福建福州350013 华北电力大学电力工程系河北保定071003

含联络开关的有源配电网网架结构复杂、运行方式变换频繁,给依赖于静态网络拓扑和固定运行方式的传统电流保护正确动作带来很大影响。对此,提出了一种电流速断保护定值优化方案,由配电终端实时监测开关量信息,上传主站获取拓扑关联矩阵... 详细信息

含联络开关的有源配电网网架结构复杂、运行方式变换频繁,给依赖于静态网络拓扑和固定运行方式的传统电流保护正确动作带来很大影响。对此,提出了一种电流速断保护定值优化方案,由配电终端实时监测开关量信息,上传主站获取拓扑关联矩阵,并结合光伏电源输出特性,自适应调整保护定值。该方案可以在考虑逆变型电源出力波动性的前提下,有效增强保护应对不同网络拓扑变化的能力,通信压力小。仿真结果表明:所提方案能有效增加I段保护范围,受分布式发电(distributed generator,DG)出力影响小,可以适应配网拓扑结构变化。

关键词：配电网分布式电流保护自适应电流保护控制策略网络重构

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multidimensional modulation of light fields via a combination of two-dimensional materials and meta-structures

引用

Science China(Information Sciences) 2023年第6期66卷 36-52页

作者： Zhipeng ZHENG Yijing HUANG Feng WU han ZhanG zheyu FANG School of Physics State Key Laboratory for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum MatterNano-optoelectronics Frontier Center of Ministry of EducationPeking University

In recent years, researchers have increasingly directed their attention towards modulating light fields through the unique properties of two-dimensional materials and the free designability of ***, transition metal sulfides, transition metal nitrides, and other two-dimensional materials have emerged as star materials in recent years due to their extraordinary properties that are vastly different from those of traditional three-dimensional materials. As a result, these materials hold immense potential for further exploration and research. Taking advantage of the free designability of meta-structures can be an effective means of unlocking the full potential of 2D materials. Accordingly, this review presents an overview of recent research progress in the area of light field modulation achieved by combining 2D materials with metastructures. The review initially covers the properties of 2D materials, followed by the concepts, principles,design, and preparation of meta-structures. Then the review delves into the concrete examples of the impact and effect of the combination on light field modulation. Lastly, the review concludes with a comprehensive summary and analysis of the current challenges and potential future developments of combining 2D materials with meta-structures.

关键词： two-dimensional materials electromagnetic meta-structures light field modulation surface plasma polarisation surface plasmon

来源：

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of water and oil immersion on the tribological properties of Excentrodendron hsienmu

引用

Science China(Technological Sciences) 2016年第11期59卷 1673-1679页

作者： YIN Wei LU HongYu ZHENG YeLong LIU zheyu han ZhiWu TIAN Yu State Key Laboratory of Tribology Tsinghua University Key Laboratory of Bionic Engineering (Ministry of Education of China) Jilin University

Modern composite materials and lignum vitae are widely studied and used in water-lubricated bearings. Noise, wear and tear,environmental pollution, and limited resources restrict the application of these materials. Thus, alternatives to lignum vitae for water-lubricated bearings should be identified and developed. In this work, the chemical composition and mechanical and tribological properties of water-, vegetable oil-, and gear oil-immersed and wax- and water-extracted Excentrodendron hsienmu(E. hsienmu) samples were studied. Results showed that the friction coefficients of the water- and gear oil-immersed and waxand water-extracted E. hsienmu samples are significantly smaller than those of the wax- and water-extracted lignum vitae samples. The grinding crack widths of the water-extracted gear oil-immersed E. hsienmu samples are smaller than those of the water-immersed lignum vitae samples. The preliminary results show that it is possible to provide an environmentally friendly method that could replace lignum vitae and other composite materials for water-lubricated bearings.

关键词： tribology mechanics water immersion oil immersion Excentrodendron hsienmu

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Abnormal intensity and polarization of Raman scattered light at edges of layered MoS_(2)

引用

Nano Research 2022年第7期15卷 6416-6421页

作者： Yan Zhao Liheng Zheng Shiyi han Bo Xu zheyu Fang Jin Zhang Lianming Tong Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China School of Physics State Key Lab for Mesoscopic PhysicsCollaborative Innovation Center of Quantum Matterand Nano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China

The edges of two-dimensional(2D)materials can exhibit special structure and thus distinctive properties differing from the interior,such as the modified photoluminescence emission,the improved electrocatalytic activity,and the enhanced nonlinear optical *** this work,we report the observation of abrupt enhancement of Raman scattered light at edges of layered MoS_(2),which is closely related to the polarization of the incident *** importantly,the intensity of out-of-plane A1g mode is enhanced much more obviously than the in-plane E_(2g)^(1)*** unique optical effect at edges is also reflected on the alteration of Raman selection *** forbidden Raman modes are observed at edge region,and the polarization of Raman scattered light can be modulated by the edge structure,which differs obviously from that of the *** attribute these particular performances to the modulation of the intensity and distribution of the electric field for the incident and Raman scattered light at the *** work provides a systematic research on the intensity and polarization modulation of the Raman scattering at edges,which would be helpful for understanding the distinctive optical properties of the edge structure.

关键词： Raman scattering polarization state edges MoS_(2) Raman selection rule

来源：

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

Recent progress in enzymatic functionalization of carbon-hydrogen bonds for the green synthesis of chemicals

引用

Chinese Journal of Chemical Engineering 2020年第10期28卷 2499-2506页

作者： zheyu Wang Yupei Jian Yilei han Zhongwang Fu Diannan Lu Jianzhong Wu Zheng Liu Key Lab of Industrial Biocatalysis Ministry of EducationDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Chemical and Environmental Engineering University of CaliforniaRiversideCA 92521USA

Enzymatic reactions take place with high chemo-, regio-, and stereo-selectivity, appealing for the direct functionalization of abundant and inexpensive compounds with C-H bonds to make fine chemicals such as high-value intermediates and pharmaceuticals. This review summarizes recent progress in the enzymatic functionalization of C-H bonds with an emphasis on heme enzymes such as cytochrome P450 s, chloroperoxidase and unspecific peroxygenases. Specific examples are discussed to elucidate the applications of the molecular and process engineering approaches to overcome the challenges hindering enzymatic C-H functionalization. Also discussed is the recent development of the chemo-enzymatic cascade as an effective way to integrate the power of metal catalysis and enzymatic catalysis for C-H functionalization.

关键词： Biocatalysis Biochemical engineering Enzyme C-H functionalization Chloroperoxidase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Additive-Mediated Selective Oxidation of Alcohols to Esters via Synergistic Effect Using Single Cation Cobalt Catalyst Stabilized with Inorganic Ligand

引用

Research 2020年第1期2020卷 611-619页

作者： Jingjing Wang han Yu zheyu Wei Qi Li Weimin Xuan Yongge Wei School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Key Lab of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China State Key Laboratory of Natural and Biomimetic Drugs Peking UniversityBeijing 100191China College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China

The direct catalytic oxidation of alcohols to esters is very appealing,but the economical-friendly catalysis systems are not yet well ***,we show that a pure inorganic ligand-supported single-atomic cobalt compound,(NH_(4))_(3)[CoMo_(6)O_(18)(OH)_(6)](simplified as CoMo_(6)),could be used as a heterogeneous catalyst and effectively promote this type of reaction in the presence of 30%H_(2)O_(2)using KCl as an *** oxidative cross-esterification of various alcohols(aromatic and aliphatic)could be achieved under mild conditions in nearly all cases,affording the corresponding esters in high yields,including several drug molecules and natural *** studies have revealed that chloride ion is able to bind to the CoMo_(6)to form a supramolecular dimer 2(CoMo_(6)∙Cl),which can effectively catalyze the reaction via a synergistic effect from chloride ion and CoMo_(6).Mechanism studies and control reactions demonstrate that the esterification proceeds via the key oxidative immediate of aldehydes.

关键词： oxidative alcohols esters

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：