检索结果-南通市图书馆

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

深切峡谷大倾角长距离轨道运输关键技术研究

施工技术（中英文） 2023年第20期52卷 86-89,97页

作者：肖浩高宁波黄剑易飞范晨阳纪晓宇中交第二航务工程局有限公司湖北武汉430040 长大桥梁建设施工交通行业重点实验室湖北武汉430040 交通运输行业交通基础设施智能制造技术研发中心湖北武汉430040 中交公路长大桥建设国家工程研究中心有限公司北京100120

依托川藏铁路雅安至林芝段某桥隧工程,针对项目施工地段典型的深切峡谷地形特点,提出一种大倾角长距离轨道运输方案,避免了峡谷地带施工场地少的不利因素,同时克服了修建临时运输公路造价高、环境影响大的缺点,实现了工程用混凝土、钢... 详细信息

依托川藏铁路雅安至林芝段某桥隧工程,针对项目施工地段典型的深切峡谷地形特点,提出一种大倾角长距离轨道运输方案,避免了峡谷地带施工场地少的不利因素,同时克服了修建临时运输公路造价高、环境影响大的缺点,实现了工程用混凝土、钢材等大宗原材料的高效运输。通过总体设计及施工方案比选,大倾角长距离轨道运输方案具有较好的经济效益,具备一定的推广应用价值。

关键词：桥隧工程深切峡谷地形混凝土轨道运输

K2HPO4-mediated Photocatalytic H_(2)Production over NiCoP/RP Heterojunction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第6期41卷 62-68页

作者： Junfeng Huang chenyang Li Xiaoyun Hu Jun fan Binran Zhao Enzhou Liu School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials Northwest UniversityXi’an 710069China School of Physics Northwest UniversityXi’an 710069China

In this work,bimetallic NiCoP nanoparticles(NPs)were firstly prepared by a solvothermal method using red phosphorus(RP)as P source,and it was combined with RP nanosheets via a physical grinding *** indicates that NiCoP has better charge transfer ability and faster H_(2)releasing kinetics than the corresponding single metal phosphides alone.6 wt%NiCoP/RP exhibits an excellent H_(2)evolution activity in 20 vol.%triethanol-amine/water solution under a 300W Xe-lamp irradiation,and the corresponding H_(2)production rate is 1535.6μmol·g^(-1)·h^(-1),which is 7.4,3.2 and 2.6 times higher than those of pure RP,6 wt%Co_(2)P/RP and 6 wt%Ni_(2)P/RP,*** addition,we demonstrate that K_(2)HPO_(4)can further enhance the H_(2)evolution kinetics by inducing a new H^(+)reduction path,when appropriate K_(2)HPO_(4)is introduced into the reaction *** H_(2)production rate of 6 wt%NiCoP/RP is boosted from 1535.6 to 2793.9μmol·g^(-1)·h^(-1) due to the easier combination between H^(+)and electrons with the assistance of HPO_(4)^(2-).It is 13.4 times higher than that of pure *** work demonstrates that bimetallic phosphides with suitable electrolytes can greatly enhance the photocatalytic H_(2)evolution efficiency.

关键词： photocatalysis hydrogen red phosphorus bimetallic cocatalyst K_(2)HPO_(4)

在线全文

学校读者我要写书评

暂无评论

水电高强钢成分设计与制造工艺研究进展

水电与抽水蓄能 2023年第3期9卷 54-58页

作者：范晨阳包晔峰韦尚志曹冲武竹雨姚进河海大学机电工程学院江苏省常州市213022 中国石油集团长城钻探工程有限公司钻具公司辽宁省盘锦市124010

国内外水力发电机组正向着高转速、高效率、大容量的方向发展,水电用钢的成分设计与制造工艺已成为国内外研究重点和热点。本文以1000MPa水电高强钢为例,综述了各常见合金元素对水电用高强钢组织和性能的影响,阐述了制造工艺中控制轧制... 详细信息

国内外水力发电机组正向着高转速、高效率、大容量的方向发展,水电用钢的成分设计与制造工艺已成为国内外研究重点和热点。本文以1000MPa水电高强钢为例,综述了各常见合金元素对水电用高强钢组织和性能的影响,阐述了制造工艺中控制轧制与控制冷却的阶段分类,及其对水电用高强钢组织和力学性能的影响机理,讨论了调质工艺中淬火和回火的目的,及回火温度对水电用高强钢强韧性匹配度的影响。指出水电用高强钢可能存在的焊接问题及相应的解决措施。

关键词：水电钢合金元素控制轧制控制冷却调质

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

国内外车用氢燃料电池技术应用进展

广东化工 2019年第20期46卷 50-51页

作者：白秀娟刘春梅兰维娟范晨阳吴凤英河南科技大学车辆与交通工程学院

在国内外节能减排的大趋势下,氢燃料电池车由于其能效高、环境友好、启动快、续航里程长等诸多优点,在最近几年发展趋势加快,有望成为未来的主要车载动力形式。目前氢燃料电池技术主要受膜电极结构、材料以及工艺的制约,国内外很多研究... 详细信息

在国内外节能减排的大趋势下,氢燃料电池车由于其能效高、环境友好、启动快、续航里程长等诸多优点,在最近几年发展趋势加快,有望成为未来的主要车载动力形式。目前氢燃料电池技术主要受膜电极结构、材料以及工艺的制约,国内外很多研究人员也在努力优化和提高燃料电池的效率、耐久性以及可靠性等。

关键词：氢燃料电池膜电极能效高环境友好

在线全文

学校读者我要写书评

暂无评论

甲醇能源的发展与应用现状

能源与节能 2020年第1期 54-55,67页

作者：白秀娟刘春梅兰维娟范晨阳吴凤英河南科技大学车辆与交通工程学院

甲醇燃料作为高效环保的替代能源,正逐渐从实验研究向实际应用转变。在交通领域,其主要应用在传统的内燃机和燃料电池上。甲醇内燃机汽车已在中国的部分城市开始试点运行,但仍需完善法规标准和国家政策给予相应的支持。甲醇燃料电池由... 详细信息

甲醇燃料作为高效环保的替代能源,正逐渐从实验研究向实际应用转变。在交通领域,其主要应用在传统的内燃机和燃料电池上。甲醇内燃机汽车已在中国的部分城市开始试点运行,但仍需完善法规标准和国家政策给予相应的支持。甲醇燃料电池由于H2可现场制取,安全可靠,避免了储氢运氢的难题,也是目前各大车企和能源公司研究的热点,现主要的研究方向有CO的去除、高效低成本催化剂制取和微通道反应器等。

关键词：甲醇燃料替代能源甲醇内燃机燃料电池

The newly-assisted catalytic mechanism of surface hydroxyl species performed as the promoter in syngas-to-C2 species on the Cu-based bimetallic catalysts

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2023年第2期8卷 487-498页

作者： chenyang Li Yuan Zhang Debao Li Baojun Wang Christopher K.Russell Maohong fan Riguang Zhang State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuanShanxi030024China Key Laboratory of Coal Science and Technology(Taiyuan University of Technology) Ministry of EducationChina State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuanShanxi030001China College of Engineering and Applied Science University of WyomingLaramieWY82071USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN47906USA School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA30332USA School of Energy Resources University of WyomingLaramieWY82071USA

In the conversion process of syngas-to-C_(2)species,the OH species are inevitably produced accompanying the production of key intermediates CH_(x)(x=1-3),traditionally,the function of surface OH species is generally accepted as the hydrogenating reactive *** work for the first time proposed and confirmed the assisted catalytic mechanism of surface OH species that performed as the promoter for syngas-to-C_(2)species on Cu-based *** and microkinetic modeling results reveal that the produced OH species accompanying the intermediates CH_(x)production on the MCu(M=Co,Fe,Rh)catalysts can stably exist to form OH/MCu catalysts,on which the presence of surface OH species as the promoter not only presented better activity and selectivity toward CH_(x)(x=1-3)compared to MCu catalysts,but also significantly suppressed CH_(3)OH production,providing enough CH_(x)sources to favor the production of C_(2)hydrocarbons and ***,the electronic properties analysis revealed the essential relationship between the electronic feature of OH/MCu catalysts and catalytic performance,attributing to the unique electronic micro-environment of the catalysts under the interaction of surface OH *** new mechanism is called as OH-assisted catalytic mechanism,which may be applied in the reaction systems related to the generation of OH species.

关键词： Syngas conversion C_(2)species Cu-based catalyst Surface OH species Assisted catalytic mechanism

Burden of Vaginitis Among Chinese Women Aged 18-74 Years——Five Provinces, China, 2023

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2024年第49期6卷 1299-1305页

作者： Zixuan fan chenyang Pei Jing Ma Chengdong Xu Zhenbo Wang Yuanli Liu Yuehua Hu School of Health Policy and Management Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingChina Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Institute for Hospital Management of Tsinghua University Shenzhen CityGuangdong ProvinceChina State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina Office of Epidemiology Chinese Center for Disease Control and PreventionBeijingChina

What is already known about this topic?Vaginitis is a prevalent and treatable gynecological condition in women that is associated with adverse reproductive outcomes,human papillomavirus(HPV)infection,and elevated human immunodeficiency virus(HIV)transmission *** is added by this report?This study identifies elevated infection risks among women aged 35–54 years,those with three or more pregnancies,and individuals who smoke or consume alcohol,with notably higher prevalence rates in Hubei and Yunnan *** findings demonstrate that awareness of cervical cancer screening serves as a protective factor,while emphasizing screening’s crucial role in early vaginitis detection.

关键词： elevated protective smoke

Mixed secondary chromatin structure revealed by modeling radiation-induced DNA fragment length distribution

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

Science China(Life Sciences) 2020年第6期63卷 825-834页

作者： Wenzong Ma chenyang Gu Lin Ma Caoqi fan Chao Zhang Yujie Sun Cheng Li Gen Yang State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBejing 100871China Radiation Biology Center Graduate School of BiostudiesKyoto UniversityKyoto 606-8501Japan Medical Artificial Intelligence and Automation Department of Radiation OncologyUniversity of Texas Southwestern Medical CenterDallasTX 75390USA Center for Bioinformatics School of Life Sciences and Center for Statistical SciencePeking UniversityBejing 100871China State Key Laboratory of Membrane Biology School of Life Sciencesand Biomedical Pioneering Innovation Center(BIOPIC)Peking UniversityBejing 100871China

Spatial chromatin structure plays fundamental roles in many vital biological processes including DNA replication, transcription,damage and repair. However, the current understanding of the secondary structure of chromatin formed by local nucleosomenucleosome interactions remains controversial, especially for the existence and conformation of 30 nm structure. Since chromatin structure influences the fragment length distribution(FLD) of ionizing radiation-induced DNA strand breaks, a 3D chromatin model fitting FLD patterns can help to distinguish different models of chromatin structure. Here, we developed a novel "30-C" model combining 30 nm chromatin structure models with Hi-C data, which measured the spatial contact frequency between different loci in the genome. We first reconstructed the 3D coordinates of the 25 kb bins from Hi-C heatmaps. Within the25 kb bins, lower level chromatin structures supported by recent studies were filled. Simulated FLD patterns based on the 30-C model were compared to published FLD patterns induced by heavy ion radiation to validate the models. Importantly, the 30-C model predicted that the most probable chromatin fiber structure for human interphase fibroblasts in vivo was 45% zig-zag 30 nm fibers and 55% 10 nm fibers.

关键词： Hi-C DNA strand break ionizing radiation chromatin structure

Body color plasticity of Diaphorina citri reflects a response to environmental stress

在线全文

学校读者我要写书评

暂无评论

Insect Science 2024年第3期31卷 937-952页

作者： Jiayao fan Feng Shang Huimin Pan chenyang Yuan Tianyuan Liu Long Yi Jinjun Wang Wei Dou Key Laboratory of Entomology and Pest Control Engineering College of Plant ProtectionSouthwest UniversityChongqingChina Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River(Ministry of Education) Southwest UniversityChongqingChina Academy of Agricultural Sciences Southwest UniversityChongqingChina National Navel Orange Engineering Research Center Gannan Normal UniversityGanzhouJiangxi ProvinceChina

Body color polyphenism is common in Diaphorina *** studies compared physiological characteristics in ***,but the ecological and biological significance of its body color polyphenism remains poorly *** studied the ecological and molecular effects of stressors related to body color in *** or low temperature induced a high proportion of gray morphs,which had smaller bodies,lower body weight,and greater susceptibility to the insecticide *** performed transcriptomic and metabolomics analysis of 2 color morphs in *** expression dynamics revealed that the differentially expressed genes were predominantly involved in energy metabolism,including fatty acid metabolism,amino acid metabolism,and carbohydrate *** these genes,plexin,glycosidase,phospholipase,take out,trypsin,and triacylglycerol lipase were differentially expressed in 2 color morphs,and 6 hsps(3 hsp70,hsp83,hsp90,hsp68)were upregulated in gray *** metabolome data showed that blue morphs exhibited a higher abundance of fatty acid and amino acid,whereas the content of carbohydrates was elevated in gray *** study partly explains the body color polyphenism of *** and provides insights into the molecular changes of stress response of ***.

关键词： body color energy metabolism environmental stress phenotypic plasticity polyphenism trade-off