检索结果-南通市图书馆

Sex-specific differences in ossification patterns of the atlas and axis:a computed tomography study

World Journal of Pediatrics 2022年第4期18卷 263-270页

作者： Wei-Liang Wu Xiao-Bo Shao Yi-guo Shen Jian-Song chen Qiang shu Department of Orthopedic Surgery Children’s HospitalZhejiang University School of MedicineHangzhouChina Department of Cardiac Surgery Children’s HospitalZhejiang University School of MedicineAdministrative BuildingNo.3333 Binsheng RoadHangzhou 310052China

Background We investigated the sex-specific differences in ossification patterns of the first two cervical vertebrae in Chinese *** A retrospective computed tomography(CT)study was performed between June 2016 and December *** younger than 16 years with cervical CT images acquired<1.5 mm slice thickness were *** eligible patients were stratified into 2 sex groups and 16 age groups based on 1-year *** ossification status of each synchondrosis and ossification variants were *** A total of 910 subjects(518 males and 392 females)were included in the *** the Cl vertebra,the neurocentral synchondroses closed at a median age of 8 years in males and 6.3 years in females,and the posterior synchondrosis fused at 5.4 years in males and at 4.4 years in *** anterior arch ossification centers were present in 74 of 411(18%)subjects,whereas posterior arch variants were observed in 18 of 258(7%)*** the C2 vertebra,the sequence of complete fusion was as follows:posterior synchondrosis,neurocentral synchondroses,and dentoneural ***,a fusion line was observed in the dentocentral synchondrosis through *** arch variants of the C2 vertebra occurred in 17 of 248(6.9%)*** was no significant difference between the sexes in ossification *** All synchondroses of the first two cervical vertebrae fuse slightly earlier in *** sequence of fusion follows a posterior-to-anterior and caudal-to-cephalad pattern in both *** variants are not rare and should not be confused with trauma.

关键词： Cervical vertebra Fusion Ossification center Ossification variant Synchondrosis

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

企业数实技术融合与新质生产力发展——来自企业专利信息的经验证据

引用

华东经济管理 2025年第1期39卷 1-9页

作者：郭娜陈东晖胡丽宁天津财经大学金融学院天津300222

文章以2013—2023年我国上市企业为研究对象,通过手工整理208万条企业专利信息,借助深度学习算法测算专利文本语义以构建企业数实技术融合指数与新质生产力指标。实证检验发现,企业数实技术融合能够有效促进新质生产力发展,且对创新突... 详细信息

文章以2013—2023年我国上市企业为研究对象,通过手工整理208万条企业专利信息,借助深度学习算法测算专利文本语义以构建企业数实技术融合指数与新质生产力指标。实证检验发现,企业数实技术融合能够有效促进新质生产力发展,且对创新突破和绿色转型两类新质生产力均有促进作用,两者存在显著的杠杆效应。机制分析表明,数实技术融合通过降低企业生产成本、提高管理能力、抑制研发操纵以推动企业新质生产力发展。异质性分析发现,在大型国有企业和管理层创新意识、数字化思维较强的企业,数实技术融合的赋能效果更明显。经济后果检验显示,数实技术融合对企业新质生产力的赋能作用是实现经济高质量发展的关键路径。

关键词：企业数实技术融合新质生产力深度学习专利文本语义高质量发展

来源：

维普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

Liobagrus chengduensis,a new species of torrent catfish(Teleostei:Siluriformes:Amblycipitidae)from the upper Changjiang River basin in southwest China

引用

Zoological Research 2022年第4期43卷 679-682页

作者： Zhong-Guang chen Yan-shu guo Jia-Yun Wu An-Xiang Wen College of Life Sciences Sichuan Agricultural UniversityYa’anSichuan 625014China Ecological Restoration and Conservation on Forest and Wetland Key Laboratory of Sichuan Province Sichuan Academy of Forestry SciencesChengduSichuan 610081China

DEAR EDITOR,A new torrent catfish species,Liobagrus chengduensis ***.,is described from the Xihe River,a tributary of the Minjiang River,Qionglai City,chengdu City,Sichuan Province,*** can be distinguished from all other congeneric species by a unique combination of the following characters:3-4 serrations on posterior edge of pectoral-fin spine;anal fin with 15-16 rays;upper jaw obviously shorter than lower jaw;caudal fin rounded,with 42-44 rays;vertebral column with 36-37 post-Weberian elements;anus close to pelvic-fin insertion;adipose fin posteriorly continuous with caudal fin,with marked incision at confluence;body generally brownish yellow;all fins lacking well-defined light-colored margins,with color fading towards edge.

关键词： southwest colored insertion

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

Enhanced electrochemical performance of Si/C electrode through surface modification using SrF_(2) particle

引用

International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1621-1628页

作者： Jun Yang Yuan-hua Lin Bing-shu guo Ming-shan Wang Jun-chen chen Zhi-yuan Ma Yun Huang Xing Li School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China

The silicon-based material exhibits a high theoretical specific capacity and is one of the best anode for the next generation of advanced lithium-ion batteries(LIBs).However,it is difficult for the silicon-based anode to form a stable solid-state interphase(SEI)during Li alloy/de-alloy process due to the large volume change(up to 300%)between silicon and Li4.4Si,which seriously limits the cycle life of the ***,we use strontium fluoride(SrF_(2))particle to coat the silicon-carbon(Si/C)electrode(SrF_(2)@Si/C)to help forming a stable and high mechanical strength SEI by spontaneously embedding the SrF_(2) particle into *** the formed SEI can inhibit the volume expansion of the silicon-carbon anode during the *** electrochemical test results show that the cycle performance and the ionic conductivity of the SrF_(2)@Si/C anode has been significantly *** X-ray photoelectron spectroscopy(XPS)analysis reveals that there are fewer electrolyte decomposition products formed on the surface of the SrF_(2)@Si/C *** study provides a facile approach to overcome the problems of Si/C electrode during the electrochemical cycling,which will be beneficial to the industrial application of silicon-based anode materials.

关键词： silicon-based anode volume expansion strontium fluoride solid electrolyte interface cycling stability

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

Effect of extrusion temperature on microstructure and tensile properties of Mg-Gd-Er-Zn-Zr alloy containing LPSO phase

引用

Journal of Iron and Steel Research International 2023年第8期30卷 1633-1641页

作者： Si-shu Wang Qian-hao Zang Hong-mei chen Yu-hang guo Feng-jian Shi Di Feng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Foshan(Southern China)Institute for New Materials Foshan 528247GuangdongChina

The Mg-1Gd-0.75Er-0.5Zn-0.18Zr(at.%)alloy with long-period stacking ordered(LPSO)phase was prepared by metal mold casting and hot *** extruded samples had a typical bimodal *** different fractions of equiaxed grains were observed in annealed *** percentage of fine grains decreased in the extruded Mg alloys with and without annealing treatment when the extrusion temperature was *** LPSO phases promote recrystal-lization behavior in the samples through particle-stimulated nucleation(PSN)*** Mg alloys extruded at 300℃ with or without annealing treatment obtained the best tensile *** the low extrusion temperature,more finely equiaxed grains with random texture are formed through PSN,and more LPSO phase kink bands are formed,which could improve the mechanical properties of the extruded Mg alloys.

关键词： Mg alloy LPSO phase Recrystallization Texture Tensile property

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

Optimization of electrical parameters for micro-arc oxidation of zirconium hydride alloy

引用

Rare Metals 2022年第7期41卷 2324-2330页

作者： Zhi-Gang Wang Wei-Dong chen shu-Fang Yan Xiu-Juan Fan Feng guo Zhi-Gao Xu College of Materials and Engineering Inner Mongolia University of TechnologyHohhot 010051China Division of Mineral Resources Metallurgy and MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan 430073China

The present work aims to present the micro-arc oxidation(MAO)zirconia coating with superior compact-ness and moderate thickness on zirconium *** experiments were designed according to L16(44)orthog-onal array to optimize electrical parameters(frequency,negative voltage,positive voltage and MAO time),with four levels of each *** optimized value was pre-dicted and verified by the confirmation *** anti-permeation effect was tested by means of vacuum dehydrogenation *** optimized coating parameters are listed as follows:treating time of 25 min,frequency of 200 Hz,negative voltage of 150 V and pos-itive voltage of 380 *** results show that the optimized coating exhibits the highest compactness of 0.3705 mg·μm^(-1).This dense coating significantly enhan-ces the hydrogen anti-permeation effects,and the PRF value is improved by nearly 13 times in contrast with that of uncoated ZrH_(1.8).

关键词： coating alloy zirconium

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

Melting Mechanism and Structure Evolution of Au Nanofilms Explored by Molecular Dynamics Simulations

引用

Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： guo-bing Zhou Zhen Yang Fang-jia Fu Na Hu Xiang-shu chen Duan-jian Tao College of Chemistry and Chemical Engineering Jiangxi Inorganic Membrane Materials Engineering Research Center Jiangxi Normal University Nanchang 330022 China

The melting mechanism and structure evolution of two-dimensional Au nanofilms with different thicknesses have been investigated in detail by using classical molecular dynamics simulations. The simulation results demonstrate that all Au nanofilms display a two-stage melting behavior of surface premelting and homogenous melting. Furthermore, the premelting behavior only occurs in the outermost layers but the other inner layers always keep a stable solid state until the corresponding melting point, which is different from the premelting behavior from surface into the interior in zero-dimensional Au nanocluster and one-dimensional Au nanowire. Meanwhile, the increase of nanofilm thickness can lead to an increase of melting point. During the premelting process, the surface reconstruction from the {100} plane to the {111} plane has directly been observed at a atomic level for all Au nanofilms. However even for the thinnest L2 nanofilm, the surface stress can't induce such surface reconstruction until temperature is up to 500 K, while similar surface reconstruction induced by surface stress can be observed at much lower temperature for the Au nanowire due to its higher surface-to-volume ratios compared to the Au nanofilm. In addition, our simulation results show that the thinnest Au nanofilm with two atomic layers can be broken into independent one-dimensional nanowires when the temperature reaches a certain value.

关键词： Phase transition Surface reconstruction Au nanofilm Molecular dynamics simulation

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

Multi-stable straw-like carbon nanotubes for mechanical programmability at microscale

引用

International Journal of Smart and Nano Materials 2024年第1期15卷 95-109页

作者： Jia Liu Yong Ma Wanjie Ren Fei Pan shu guo Yuli chen Bin Ding National Key Laboratory of Strength and Structural Integrity Institute of Solid MechanicsBeihang University(BUAA)BejingPR China Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi'anShaanxiPR China Fuselage Department Shanghai Aircraft Design and Research InstituteShanghaiPR China School of Vehicle and Energy Yanshan UniversityQinhuangdaoPR China

Inspired by macroscale 3D pixel mechanical metamaterials and microscale straw-like carbon nanotube,we propose a design of multi-stable straw-like carbon nanotubes(MSCNT)via optimizing the structure of a unit to obtain multiple stable states under dis-placement loading by molecular *** unit of MSCNT is mirror-symmetrically connected two truncated graphene cones with specific apex *** switching the LJ term in AIREBO potential,we verify that the bistability of unit is co-determined by snap-through instability and microscale ***,we examine the validity of the multi-stability of the unit cells arranged in series and in *** results indicate that the MSCNT can achieve mechanical programmability in microscale,which triggers many potential applications in need of customizing nanos-cale mechanical behaviors.

关键词： Multi-stable state straw-shaped carbon nanotube microscale adhesions mechanical programmability

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

Gene-Gene Interaction between PPARd and PPARy Is Associated with Abdominal Obesity in a Chinese Population

引用

Journal of Genetics and Genomics 2012年第12期39卷 625-631页

作者： Yi Ding Zhi-Rong guo Ming Wu Qiu chen Hao Yu Wen-shu Luo Department of Epidemiology School of Public HealthSoochow University Center for Diseases Control of Jiangsu Province Center for Disease Control of Changzhou

The peroxisome proliferator-activated receptors （PPARs） -α, -δ/β and -γ are the ligand-activated transcription factors that function as the master regulators of glucose, fatty acid and lipoprotein metabolism, energy balance, cell proliferation and differentiation, inflarn- marion, and atherosclerosis. The objective of the current study was to examine the main and interactive effect of seven single nucleotide polymorphisms （SNPs） of PPARδ/γ, in contribution to abdominal obesity. A total of 820 subjects were randomly selected and no indi- viduals were related. The selected S NPs in PPARδ （rs2016520 and rs9794） and PPARγ （rs10865710, rs 1805192, rs709158, rs3856806, and rs4684847） were genotyped. Mean difference and 95% confident interval were calculated. Interactions were explored by the method of generalized multifactor dimensionality reduction. After adjustment for gender, age, and smoking status, it was found that the carriers of the C allele （TC ＋ CC） of rs2016520 were associated with a decreased risk of abdominal obesity compared to the carriers of the TT genotype （mean difference = -2.63, 95% CI = -3.61-1.64, P 〈 0.000t）. A significant two-locus model （P = 0.0107） involving rs2016520 and rs 10865710 and a significant three-locus model （P = 0.0107） involving rs2016520, rs9794, and rs 1805192 were observed. Overall, the three-locus model had the highest level of testing accuracy （59.85%） and showed a better cross-validation consistency （9/10） than two-locus model. Therefore, for abdominal obesity defined by waist circumference, we chose the three-locus model as the best interaction model. In conclusion, the C allele in rs2016520 was significantly associated with a lower abdominal obesity. Moreover, an interaction among rs2016520, rs1805192, and rs9794 on incident abdominal obesity could be demonstrated.

关键词： PPARs gene Polymorphism Abdominal obesity Interaction

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

Research of {0001} crystal orientation for magnesium alloys solidified in a fashion of cellular crystals

引用

International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 136-140页

作者： guo-wei Chang shu-ying chen Qing-chun Li Xu-dong Yue Yi-hui Qi School of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China

The magnesium alloy grew in a fashion of cellular crystals during the process of unidirectional solidification, and the {0001} crystal face orientation in the cast ingot of the magnesium alloy was studied. The theoretical model and methodology were set up, and a cor-responding experiment was carried out to verify the theoretical analysis results. The experimental results indicate that the {0001} crystal face of magnesium crystals parallels to the width direction for the thin-plate cast ingot when the magnesium grows in a manner of cellular crystals. The separation angle between the {0001} crystal face of magnesium crystals and the vertical axis line of the cast ingot is about 62° for the circular column cast ingot, which distributes in cone-type. The theoretical analysis results are basically in agreement with the experimental ones of previous literatures and this paper.

关键词： magnesium alloys solidification crystal growth crystal faces

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

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：