检索结果-南通市图书馆

Effect of phosphorus content on interfacial heat transfer and film deposition behavior during the high-temperature simulation of strip casting

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1016-1025页

作者： Wanlin Wang cheng lu Liang Hao Jie Zeng Lejun Zhou Xinyuan Liu Xia Li Chenyang Zhu School of Metallurgy and Environment Central South UniversityChangsha 410083China National Center for International Research of Clean Metallurgy Central South UniversityChangsha 410083China Institute of Research of Iron and Steel ShasteelJiangsu ProvinceZhangjiagang 215625China

The interfacial wettability and heat transfer behavior are crucial in the strip casting of high phosphorus-containing steel.A hightemperature simulation of strip casting was conducted using the droplet solidification technique with the aims to reveal the effects of phosphorus content on interfacial wettability,deposited film,and interfacial heat transfer *** showed that when the phosphorus content increased from 0.014wt%to 0.406wt%,the mushy zone enlarged,the complete solidification temperature delayed from1518.3 to 1459.4℃,the final contact angle decreased from 118.4°to 102.8°,indicating improved interfacial contact,and the maximum heat flux increased from 6.9 to 9.2 MW/*** the phosphorus content from 0.081wt%to 0.406wt%also accelerated the film deposition rate from 1.57 to 1.73μm per test,resulting in a thickened naturally deposited film with increased thermal resistance that advanced the transition point of heat transfer from the fifth experiment to the third experiment.

关键词： strip casting interfacial heat transfer interfacial wettability naturally deposited film phosphorus content

Evolution of interfacial heat transfer,contact behavior and microstructure during sub-rapid solidification of molten steel with different hydrogen contents

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第1期31卷 215-223页

作者： cheng lu Wan-lin Wang Chen-yang Zhu Jie Zeng Xin-yuan Liu Hua-long Li School of Metallurgy and Environment Central South UniversityChangsha410083HunanChina National Center for International Research of Clean Metallurgy Central South UniversityChangsha410083HunanChina Institute of Research of Iron and Steel ShasteelZhangjiagang215625JiangsuChina

Typical Q235 low-carbon steel samples with different hydrogen contents(0.0004,0.0008,and 0.0013 wt.%)were prepared by adjusting the environment humidity and *** effects of hydrogen on interfacial heat transfer,contact behavior,and microstructure evolution were investigated using a novel droplet solidification *** results revealed that when the hydrogen content increases from 0.0004 to 0.0013 wt.%,the maximum heat flux between the molten steel and cooling substrate decreases from 8.01 to 6.19 MW/m^(2),and the total heat removed in the initial 2 s reduces from 10.30 to 8.27 MJ/m^(2).Moreover,the final contact angle between the molten steel and substrate increases from 103.741°to 113.697°,and the number of pores on the droplet bottom surface increases significantly from 21 to 210 with the increase in *** surface roughness of the droplet bottom surface increases from 20.902 to 49.181 *** addition,the average grain size of the droplet increases from 14.778 to 33.548 pm with the increase in the hydrogen *** interfacial contact condition becomes worse due to the escape of hydrogen from the steel matrix during the cooling process,which leads to the reduction in the interfacial heat transfer and the increase in the grain size.

关键词： Strip casting Hydrogen content Interfacial heat transfer behavior Contact behavior Microstructure evolution

Changes in visual performance after implantation of different intraocular lenses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第7期17卷 1273-1282页

作者： Bo-Wen Li Hao Huang Man-Sha Huang Shuang-Lin Guo lu Gao Yu-Ying Zeng lu cheng Si-Yang Yao Jian-Qiang Lin Lin Liu Ye Yang Xiao-Ming lu Hao cheng Department of Ophthalmology the First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhou 510000Guangdong ProvinceChina Eye Center of Xiangya Hospital Hunan Key Laboratory of OphthalmologyCentral South UniversityChangsha 410008Hunan ProvinceChina Department of Ophthalmology Zhuzhou Hospital Affiliated to Xiangya School of MedicineCentral South UniversityZhuzhou 412000Hunan ProvinceChina State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangzhou 510060Guangdong ProvinceChina Department of Ophthalmology Guangzhou Red Cross HospitalJinan UniversityGuangzhou 510000Guangdong ProvinceChina AIER Eye Hospital Jinan UniversityGuangzhou 510180Guangdong ProvinceChina

AIM:To evaluate the trending visual performance of different intraocular lenses(IOLs)over time after ***:Ninety-one patients received cataract surgery with implantations of monofocal(Mon)IOLs,segmental refractive(SegRef)IOLs,diffractive(Dif)IOLs,and extendeddepth-of-focus(EDoF)IOLs were *** aberrations and optical quality collected with iTrace and OQAS within postoperative 6mo were followed and ***:Most of the visual parameters improved over the postoperative *** postoperative visual acuity(POVA)of the Mon IOL,SegRef IOL,and EDoF IOL groups achieved relative stability in earlier states compared with the Dif IOL ***,the overall visual performance of the 3 IOLs continued to upturn in small extents within the postoperative *** optical quality initially improved in the EDoF IOL group,then in the Mon IOL,SegRef IOL,and Dif IOL *** and objective visual performance of the Mon IOL and EDoF IOL groups,as well as POVA and visual quality of the Dif IOL group,improved in the postoperative 1mo and *** the postoperative 6mo,gradual improvements were observed in the visual acuity and objective visual performance of the SegRef IOL group,as well as in the postoperative optical quality of the Dif IOL ***:The visual performance is different among eyes implanted with different *** findings of the current study provide a potential reference for ophthalmologists to choose suitable IOLs for cataract patients in a personalized solution.

关键词： intraocular lenses visual performance changing characteristics high-order wavefront aberration

Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi_(2)Te_(4)

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 Physics B 2024年第4期33卷 160-171页

作者：卢倬成冯济 International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China

A Weyl node is characterized by its chirality and *** develop a theory of how nth-order nonlinear optical conductivity behaves under transformations of anisotropic tensor and tilt, which clarifies how chirality-dependent and-independent parts of optical conductivity transform under the reversal of tilt and *** on this theory, we propose ferromagnetic Mn Bi2Te4as a magnetoelectrically regulated, terahertz optical device, by magnetoelectrically switching the chiralitydependent and-independent DC *** results are useful for creating nonlinear optical devices based on the topological Weyl semimetals.

关键词： nonlinear optical response topological Weyl semimetals chiral anomaly

Matrix metalloproteinase 2 degrades collagen I to regulate ovarian development by association with an insulin-like peptide

在线全文

学校读者我要写书评

暂无评论

Insect Science 2024年第4期31卷 1090-1106页

作者： Yi Wei Xiao-Lin Zhou Peng Chen Tai-Hang Liu cheng lu Min-Hui Pan State Key Laboratory of Silkworm Genome Biology Southwest UniversityChongqingChina Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry Southwest UniversityChongqingChina Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejiang ProvinceChina

The ovary generally undergoes tissue remodeling during larval to pupal transition,which includes membrane degeneration and ovariole *** the same time,the hormones produced by insects significantly change during ***,the regulatory mechanism for ovarian development and hormones is not fully understood in ***,we found that matrix metalloproteinase 2(MMP2)was highly expressed in the ovarian capsules and ovarioles,and the development was abnormal after knocking out MMP2 in Bombyx *** process of abnormal degradation of collagen I due to MMP2 deletion,which resulted in abnormal development of ovarioles and eggs,was analyzed in *** proteomics of ovaries in the MMP2-knock out and wild type strains showed a critically significant difference in the expression of a protein,insulin-like peptide(ILP).Additional analysis revealed significant alteration of ILP during ovarian development,and abnormal expression of ILP significantly affected ovarian development in vivo and MMP2 expression in vitro and in *** results showed that MMP2 regulation of ovarian tissue remodeling is closely related to ILP *** study provides new insights into the regulatory mechanism of MMP2 and ovarian development in ***.

关键词： Bombyx mori collagen I insulin-like peptide matrix metalloproteinase ovarian development

The carbon border adjustment mechanism is inefficient in addressing carbon leakage and results in unfair welfare losses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fundamental Research 2024年第3期4卷 660-670页

作者： Xinlu Sun Zhifu Mi lu cheng D'Maris Coffman Yu Liu The Bartlett School of Sustainable Construction University College LondonLondon WC1E 7HBUnited Kingdom College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

The European Commission has proposed a Carbon Border Adjustment Mechanism(CBAM)to reduce carbon leakage and create a level playing field for its domestic products and imported ***,the effectiveness of the proposal remains unclear,especially when it triggers threats of retaliation from trading partners of the European *** apply a Computable General Equilibrium model-Global Trade Analysis Project-to assess the economic and environmental impacts of different CBAM *** we show that the effectiveness of the CBAM to address carbon leakage risks is rather limited,and the CBAM raises concerns over global welfare costs,Correct to Gross Domestic Product(GDP)losses,and violation of equality *** retaliation leads to multiplied welfare losses,which would mostly be borne by poor *** results question the carbon leakage reduction effect of a unilateral trade policy and suggest that climate change mitigation still needs to be performed within the framework of international cooperation.

关键词： Carbon border adjustment mechanism Carbon leakage Climate change mitigation Floorcarbon price Trade retaliation

Optimization Design of the Multi-Layer Cross-Sectional Layout of An Umbilical Based on the GA-GLM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第2期38卷 247-254页

作者： YANG Zhi-xun YIN Xu FAN Zhi-rui YAN Jun lu Yu-cheng SU Qi MAO Yandong WANG Hua-lin Institute of marine machinery College of Mechanical and Electrical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDepartment of Engineering MechanicsDalian University of TechnologyDalian 116024China Ningbo Institube of Dalian University of Technology Ningbo 315040China

Marine umbilical is one of the key equipment for subsea oil and gas exploitation,which is usually integrated by a great number of different functional components with *** layout of these components directly affects manufacturing,operation and storage performances of the *** the multi-layer cross-sectional layout design of the umbilical,a quantifiable multi-objective optimization model is established according to the operation and storage *** the manufacturing factors,the multi-layering strategy based on contact point identification is introduced for a great number of functional ***,the GA-GLM global optimization algorithm is proposed combining the genetic algorithm and the generalized multiplier method,and the selection operator of the genetic algorithm is improved based on the steepest descent *** algorithm is used to find the optimal solution in the global space,which can converge from any initial layout to the feasible layout *** feasible layout solution is taken as the initial value of the generalized multiplier method for fast and accurate ***,taking umbilicals with a great number of components as examples,the results show that the cross-sectional performance of the umbilical obtained by optimization algorithm is better and the solution efficiency is ***,the multi-layering strategy is effective and *** design method proposed in this paper can quickly obtain the optimal multi-layer cross-sectional layout,which replaces the manual design,and provides useful reference and guidance for the umbilical industry.

关键词： umbilical cross-sectional layout multi-layers GA-GLM optimization

Causal roles of gut microbiota in cholangiocarcinoma etiology suggested by genetic study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第4期16卷 1319-1333页

作者： Zhi-Tao Chen Chen-Chen Ding Kai-Lei Chen Yang-Jun Gu Chi-cheng lu Qi-Yong Li Division of Hepatobiliary and Pancreatic Surgery Shulan(Hangzhou)Hospital Affiliated to Zhejiang Shuren University Shulan International Medical CollegeHangzhou 310000Zhejiang ProvinceChina Pediatric Psychology The Affiliated Mental Health Centre&Hangzhou Seventh People’s HospitalZhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina School of Medicine Zhejiang Shuren UniversityHangzhou 310000Zhejiang ProvinceChina School of Medicine Zhejiang Chinese Medical University Zhejiang Shuren CollegeHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Cholangiocarcinoma(CCA)is a highly malignant biliary tract cancer with poor *** studies have implicated the gut microbiota in CCA,but evidence for causal mechanisms is *** To investigate the causal relationship between gut microbiota and CCA *** We performed a two-sample mendelian randomization study to evaluate potential causal associations between gut microbiota and CCA risk using genome-wide association study summary statistics for 196 gut microbial taxa and *** variants were used as instrumental *** sensitivity analyses assessed result *** Fifteen gut microbial taxa showed significant causal associations with CCA *** genetically predicted abundance of genus Eubacteriumnodatum group,genus Ruminococcustorques group,genus Coprococcus,genus Dorea,and phylum Actinobacteria were associated with reduced risk of gallbladder cancer and extrahepatic *** intrahepatic CCA risk was associated with higher abundance of family Veillonellaceae,genus Alistipes,order Enterobacteriales,and phylum *** effects against CCA were suggested for genus Collinsella,genus Eisenbergiella,genus Anaerostipes,genus Paraprevotella,genus Parasutterella,and phylum *** analyses indicated these findings were reliable without *** This pioneering study provides novel evidence that specific gut microbiota may play causal roles in CCA *** experimental validation of these candidate microbes is warranted to consolidate causality and mechanisms.

关键词： Cholangiocarcinoma Mendelian randomization Gut microbiota Instrumental variables Sensitivity analyses

晚清来华西医对汉口的疾病调查(1864-1874)——以医院年报、海关医报为中心

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

历史档案 2024年第1期 105-113页

作者：程露湖北省社会科学院文史研究所 430077

晚清汉口开埠后,海关医员里德、医学传教士师惟善等英籍西医相继抵达汉口,对当地疾病状况展开调查,定期撰写医院年报、海关医报。一方面,西医从殖民医学视角出发,调查疾病与汉口卫生环境之间的关系,揭示出汉口的气候水土、暗渠式排水系... 详细信息

晚清汉口开埠后,海关医员里德、医学传教士师惟善等英籍西医相继抵达汉口,对当地疾病状况展开调查,定期撰写医院年报、海关医报。一方面,西医从殖民医学视角出发,调查疾病与汉口卫生环境之间的关系,揭示出汉口的气候水土、暗渠式排水系统、民众共用清洁用品等卫生习惯的不利影响;另一方面,西医从区域比较视野出发,将汉口与中国其他地区、欧洲进行横向与纵向的对比分析,认识到疾病具有地方性,发现汉口眼病高发、结石病罕见的特征,并总结出可供欧洲医师参考的汉口饮食经验。西医在调查汉口的过程中,对瘴气、微生物致病等多重理论的运用,及“跨国别、区域的医学流通网络”的构建,反映出19世纪六七十年代西医界既处于新旧医学理论共存、交锋的时期,其对中国的调查视角亦处于殖民性与地方性之间。与此同时,西医调查报告更在一定程度上揭示了晚清汉口的民众生活状态、疾病观念与地方社会风貌。

关键词：西医汉口疾病调查殖民性地方性