检索结果-南通市图书馆

Dynamic recrystallization behavior and finite element analysis of a low-alloy high-strength steel

Journal of Iron and Steel Research International 2024年第11期31卷 2828-2851页

作者： yu-hao liu hao-qing Tang Guo-ming Zhu Bao-qiao Wu Jie Wang Meng Xia School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Ma’anshan Iron&Steel Co. Ltd.Ma’anshan243000AnhuiChina

The axial single-pass high temperature compression test of a hot-rolled extra-large heavy H-beam steel continuous casting billet (Q420 steel) under different deformation conditions through the Gleeble-1500D thermomechanical simulator was carried out. The modified Johnson–Cook model and the Arrhenius model based on strain-compensated of Q420 steel were established. The latter can more accurately reflect the flow behavior of Q420 steel. For the simulation of thermal compression, dynamic recrystallization (DRX) correlation models were developed and imported into DEFORM-3D software. According to simulation results, high temperatures and low strain rates are conducive to DRX. Due to the uneven distribution of equivalent strain and temperature in different parts of the same section, DRX volume fraction and grain size are unevenly distributed. At the center, the DRX volume fraction is the largest and the grain size is the smallest. The upper and lower edges are vice versa, and the left and right edges are centered. Optical microscopy and electron backscatter diffraction characterization methods were used to study the hot compression microstructure under different deformation conditions. As the deformation amount increases, complete DRX is gradually reached. The original austenite grain gradually becomes smaller. Local average misorientation decreases with the progression of DRX but increases with the amount of deformation after completion of DRX. As the temperature increases and the rate decreases, low angle grain boundaries and medium angle grain boundaries gradually decrease, and high angle grain boundaries gradually increase, indicating that dislocation decreases gradually, DRX grains increase gradually, and martensitic multilayer structure is obvious. As austenite grain size increases, the length of martensite lath increases, and the number of martensite blocks decreases.

关键词： H-beam steel Q420 steel High temperature constitutive model Dynamic recrystallization Finite element analysis

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

Numerical study of hydraulic fracturing in the sectorial well-factory considering well interference and stress shadowing

引用

Petroleum Science 2023年第6期20卷 3567-3581页

作者： yu-hao liu Jin-Tao Zhang Jie Bai Feng-Shou Zhang Ji-Zhou Tang Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Southwest Oil&Gas Field Company PetroChinaChengdu610017SichuanChina Oil and Gas Technology Research Institute PetroChina Changqing Oilfield CompanyXi’an710021ShaanxiChina National Key Laboratory of Marine Geology Tongji UniversityShanghai200092China School of Ocean and Earth Science Tongji UniversityShanghai200092China

In the Changqing Oilfield in northwest China, when traditional petroleum exploitation encounters forestry reserves or water source protection areas, sectorial well-factory design is proposed. The most distinct feature of a sectorial well-factory is the deviation of the well from the minimum horizontal principal stress, resulting in hydraulic fracture deflection after the initiation, along with possible well interference (i.e., fracture hit) and fracture coalescence in the oblique wells. Four indexes describing well deflection are then proposed according to fracture morphology. Several fracturing designs, including stage arrangement, fracturing sequences, and fracturing techniques are applied to study the feasibility of the sectorial well-factory design. The results show that the “gradual” or “sparse” stage arrangement, large injection rate, and simultaneous multifracture treatment can help to optimize the fracture morphology and stimulation design. However, the subsequent stress shadowing effect usually adversely affects the fracturing of adjacent wells. With a small initial horizontal stress difference, large injection rate and staggered stage arrangement can achieve ideal stimulation performance. Our results can provide a guidance for optimizing stimulation design in unconventional well-factory while taking into account environmental protection.

关键词： Hydraulic fracturing Sectorial well-factory Fracture deflection Well interference Stress shadowing

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

Poly(3-hexylthio) thiophene Field-effect Transistor Device Performance: Impact of the Content of Hexylthio Side Chain on Backbone

引用

Chinese Journal of Polymer Science 2024年第1期42卷 14-23,I0005页

作者： hao-yu liu Lian-He Han Ling-Wei Kong Li-Ping Zhu Xiao-Lan Qiao Mei-Fang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Regioregular poly(3-hexylthio)thiopene(P3HTT) has emerged tremendous potential in organic electronic applications due to the strong noncovalent interactions from the sulfur atom linked to thiophene. However, P3HTT generally exhibits low charge mobility mostly due to poor solution processability attributed to dense arrangement of hexylthio side chain in polymer, which led to strong noncovalent interactions among sulfur atoms. To balance the nonvalent interaction and aggregation for P3HTT, herein, we systematically study the effect of hexylthio side chain content in polymer backbone on the structure and properties. A series of regioregular P3HTT-based homopolymers(P3HTT, P3HTT-50,P3HTT-33 and P3HTT-25) were prepared via Kumada catalyst transfer polycondensation method from a set of mono-, bi-, ter-and quarterthiophenes containing different contents of hexylthio side chain. The DFT calculation shows the planarity of polymers backbone could be improved through reducing the density of hexylthio side chain in polymer mainchain. And significant changes in their crystallinity, aggregation and optical properties were observed with the content of hexylthio side chain reducing. The P3HTT-33 displayed the highest field-effect transistor hole mobility of 2.83×10^(-2) cm^(2)·V^(-1)·s^(-1) resulting from a balance between the crystallinity and planarity. This study demonstrates modulating the content of hexylthio side chain in P3HTT is an effective strategy to optimize the opto-electronic properties of polymer obtaining excellent semiconductor device performance.

关键词： Conjugated polymer Polythiophene Noncovalent interaction Molecular aggregation Organic field-effect transistor

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

Precipitates and corrosion resistance of an Al-Zn-Mg-Cu-Zr plate with different percentage reduction per passes

引用

Rare Metals 2018年第5期37卷 381-387页

作者： yu-hao liu Liang-Ming Yan Xiao-Hu Hou Dong-Nan Huang Jian-Bo Zhang Jian Shen School of Materials Science and Engineering Inner Mongolia University of Technology Institute of Engineering and Research Jiangxi University of Science and Technology State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous

7055 aluminum alloy plates with the same size were rolled by two processes： small percentage reduction per pass （PRPP） and large percentage reduction per pass, respectively. Meanwhile, the effect of PRPP on the precipitates and corrosion resistance of 7055 aluminum alloy plate was investigated. The mechanisms were analyzed and discussed by optical microscopy （OM）, transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HRTEM） and electron back-scattered diffraction （EBSD） technique. Large PRPP can improve the corrosion resistance. For the plate rolled by small PRPP, the main precipitate is guinier-preston （GP） zone and continuous grain boundary precipitates （GBPs）, while, for the plate rolled by large PRPP, the main precipitates are the GP zone and η precipitate, and the GBPs are discontinuous.

关键词： 7055 aluminum alloy Microstructure Rolling Corrosion resistance

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

Insights into the interplay between gut microbiota and lipid metabolism in the obesity management of canines and felines

引用

Journal of Animal Science and Biotechnology 2024年第5期15卷 1761-1777页

作者： Kaiqi Li Xiangyu Xiao yuling Li Sichen Lu Jianghang Zi Xiaoqiang Sun Jia Xu hao‑yu liu Xiaoqiong Li Tongxing Song Demin Cai Laboratory of Animal Physiology and Molecular Nutrition Jiangsu Key Laboratory of Animal Genetic Breeding and Molecular DesignCollege of Animal Science and TechnologyYangzhou UniversityYangzhou 225009China College of Animal Science and Technology Huazhong Agricultural UniversityWuhan 430070China School of Life Science and Engineering Foshan UniversityFoshan 528231China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro‑Products Institute of Food ScienceZhejiang Academy of Agricultural SciencesHangzhouZhejiang 310021People’s Republic of China College of Agriculture Jinhua PolytechnicJinhua 321017China

Obesity is a prevalent chronic disease that has significant negative impacts on humans and our companion animals,including dogs and *** occurs with multiple comorbidities,such as diabetes,hypertension,heart disease and osteoarthritis in dogs and cats.A direct link between lipid metabolism dysregulation and obesity-associated diseases has been ***,the understanding of such pathophysiology in companion animals is *** review aims to address the role of lipid metabolism in various metabolic disorders associated with obesity,emphasizing the involvement of the gut ***,we also discuss the management of obesity,including approaches like nutritional interventions,thus providing novel insights into obesity prevention and treatment for canines and felines.

关键词： Cat Dog Gut microbiota Lipid metabolism Obesity Management

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

Fundamentals and photocatalytic hydrogen evolution applications of quaternary chalcogenide semiconductor:Cu_(2)ZnSnS_(4)

引用

Rare Metals 2022年第7期41卷 2153-2168页

作者： Xin-Long Zheng Ying-Jie Yang yu-hao liu Pei-Lin Deng Jing Li Wei-Feng liu Peng Rao Chun-Man Jia Wei Huang Yan-Lian Du Yi-Jun Shen Xin-Long Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Laboratory of Fine ChemistrySchool of ScienceHainan UniversityHaikou 570228China Mechanical and Electrical Engineering College Hainan UniversityHaikou 570228China

Inexpensive,safe,and efficient conversion of solar energy to hydrogen from water splitting requires the development of effective and durable ***_(2)ZnSnS_(4)(CZTS),the emerging quaternary chalcogenide material for solar energy conversion,possesses many advantages,such as narrow direct band gap(1.5 eV),nontoxic,earth-abundance,and low melting ***,CZTS-based photocatalysts have been extensively investigated for their application as an active photocatalyst in hydrogen evolution from water splitting,while the performance is still highly needed to be improved for the practical *** this review,first,the crystal and band structure properties of CZTS are briefly introduced,and afterward,the basic principle of photocatalytic hydrogen evolution from water splitting is ***,the performance and status of bare CZTS,the combination of CZTS and co-catalysts,and CZTSbased heterojunction photocatalysts for hydrogen evolution are reviewed and discussed in ***,the issues and challenges currently encountered in the application of CZTS and their possible solutions for developing advanced CZTS photocatalysts are provided.

关键词： Cu_(2)ZnSnS_(4) Quaternary chalcogenide Photocatalyst Hydrogen evolution

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

Is intestinal metaplasia the point of no return in the progression of gastric carcinogenesis?

引用

Chinese Medical Journal 2021年第24期134卷 2965-2967页

作者： Si-Ran Wu yu-hao liu Yong-Quan Shi State Key Laboratory of Cancer Biology National Clinical Research Center for Digestive DiseasesXijing HospitalAir Force Medical UniversityXi’anShaanxiChina Department of Gastroenterology Chinese Armed Police Force Fujian Armed Police Corps hospitalFuzhouFujianChina First Cadet Regiment School of Basic MedicineAir Force Medical UniversityXi’anShaanxiChina

Gastric cancer(GC)is one of the most common malignant tumors *** China,GC is the second most common malignant tumor,and it is the second leading cause of cancer mortality.[1]Correa model showed that the development of intestinal-type GC was a consecutive cancerous process including normal gastric mucosa,non-atrophic gastritis,atrophic gastritis(AG),intestinal metaplasia(IM),dysplasia and intestinal-type GC in sequence.[2]Epithelium-resembling intestinal morphology replaced gastric mucosa which was defined as IM.[3]Among these precancerous conditions,IM was demonstrated to be a vital risk factor for GC,especially incomplete IM and extensive IM.[4,5].

关键词： gastritis gastric metaplasia

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

Lactobacillus johnsonii N5 from heat stress-resistant pigs improves gut mucosal immunity and barrier in dextran sodium sulfate-induced colitis

引用

Animal Nutrition 2023年第4期15卷 210-224页

作者： Long yuan Chuyang Zhu Fang Gu Miaonan Zhu Jiacheng Yao Cuipeng Zhu Shicheng Li Kun Wang Ping Hu yunzeng Zhang Demin Cai hao-yu liu College of Animal Science and Technology Yangzhou UniversityYangzhou 225009China Joint International Research Laboratory of Agricultural&Agri-Product Safety The Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou UniversityYangzhou 225009China

Developing effective strategies to prevent diarrhea and associated-gut disorders in mammals has gained great *** to the many health benefits provided by the commensal microbiota of the intestinal tract,such as against environmental perturbation,we explored the host phenotype-associated microbes and their probiotic *** on the observations that the chronic heat stress-exposed weaned piglets present as heat stress-susceptible(HS-SUS)or heat stress-resistant(HS-RES)individuals,we confirmed the phenotypic difference between the two on growth performance(P<0.05),diarrhea index(P<0.001),intestinal heat shock protein 70(HSP70)regulation(P<0.01),and inflammatory responses(P<0.01).By comparing the gut microbiome using 16S rRNA gene sequencing and KEGG functional analysis,we found that Lactobacillus johnsonii exhibited significantly higher relative abundance in the HS-RES piglets than in the HS-SUS ones(P<0.05).Further experiments using a mouse model for chemical-induced inflammation and intestinal injury demonstrated that oral administration of a representative *** N5(isolated from the HS-RES piglets)ameliorated the clinical and histological signs of colitis while suppressing intestinal pro-inflammatory cytokines TNF-a and IL-6 production(P<0.05).We found that N5 treatment enhanced tight junction proteins ZO-1 and occludin and cytoprotective HSP70 levels under physiological condition and restored their mucosal expressions in colitis(P<0.05).In support of the high production of the anti-inflammatory cytokine IL-10,N5 promoted the intestinal Peyer’s patches MHCⅡ+and CD103+dendritic cell populations(P<0.05),increased the regulatory T(Treg)cell numbers(P<0.05),and decreased the Th17 population and its IL-17a production under physiological condition and during colitis(P<0.01).Our results shed light on understanding the interaction between commensal Lactobacillus and the host health,and provide *** N5 as an alternative to antibiotics for p

关键词： Lactobacillus johnsonii Probiotic Heat shock protein Diarrhea Heat stress Treg/Th17

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

The role of axon guidance molecules in the pathogenesis of epilepsy

引用

Neural Regeneration Research 2025年第5期20卷 1244-1257页

作者： Zheng liu Chunhua Pan hao Huang Department of Neurology Affiliated Hospital of Zunyi Medical UniversityZunyiGuizhou ProvinceChina

Current treatments for epilepsy can only manage the symptoms of the condition but cannot alter the initial onset or halt the progression of the disease. Consequently, it is crucial to identify drugs that can target novel cellular and molecular mechanisms and mechanisms of action. Increasing evidence suggests that axon guidance molecules play a role in the structural and functional modifications of neural networks and that the dysregulation of these molecules is associated with epilepsy susceptibility. In this review, we discuss the essential role of axon guidance molecules in neuronal activity in patients with epilepsy as well as the impact of these molecules on synaptic plasticity and brain tissue remodeling. Furthermore, we examine the relationship between axon guidance molecules and neuroinflammation, as well as the structural changes in specific brain regions that contribute to the development of epilepsy. Ample evidence indicates that axon guidance molecules, including semaphorins and ephrins, play a fundamental role in guiding axon growth and the establishment of synaptic connections. Deviations in their expression or function can disrupt neuronal connections, ultimately leading to epileptic seizures. The remodeling of neural networks is a significant characteristic of epilepsy, with axon guidance molecules playing a role in the dynamic reorganization of neural circuits. This, in turn, affects synapse formation and elimination. Dysregulation of these molecules can upset the delicate balance between excitation and inhibition within a neural network, thereby increasing the risk of overexcitation and the development of epilepsy. Inflammatory signals can regulate the expression and function of axon guidance molecules, thus influencing axonal growth, axon orientation, and synaptic plasticity. The dysregulation of neuroinflammation can intensify neuronal dysfunction and contribute to the occurrence of epilepsy. This review delves into the mechanisms associated with

关键词： axon guidance drug-resistant epilepsy epilepsy nerve regeneration nervous system diseases neural pathways neuroinflammatory diseases neuronal plasticity neurons synaptic remodeling

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

Hydrogen agronomy:research progress and prospects

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第11期21卷 841-855页

作者： yue-qiao WANG yu-hao liu Shu WANG Hong-mei DU Wen-biao SHEN College of Life Sciences Laboratory Center of Life SciencesNanjing Agricultural UniversityNanjing 210095China Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai 200240China School of Design Shanghai Jiao Tong UniversityShanghai 200240China

Agriculture is the foundation of social *** the pressure of population growth,natural disasters,environmental pollution,climate change,and food safety,the interdisciplinary"new agriculture"is becoming an important trend of modern *** fact,new agriculture is not only the foundation of great health and new energy sources,but is also the cornerstone of national food security,energy security,and *** agronomy focuses mainly on the mechanism of hydrogen gas(H2)biology effects in agriculture,and provides a theoretical foundation for the practice of hydrogen agriculture,a component of the new *** research on the biological effects of H2 focused chiefly on *** mechanism of selective antioxidant is the main theoretical basis of hydrogen *** experiments have demonstrated that H2 can regulate the growth and development of plant crops,edible fungus,and livestock,and enhance the tolerance of these agriculturally important organisms against abiotic and biotic *** more importantly,H2 can regulate the growth and development of crops by changing the soil microbial community composition and *** of H2 can also improve the nutritional value and postharvest quality of agricultural *** have also shown that the biological functions of molecular hydrogen are mediated by modulating reactive oxygen species(ROS),nitric oxide(NO),and carbon monoxide(CO)signaling cascades in plants and *** review summarizes and clarifies the history of hydrogen agronomy and describes recent progress in the *** also argue that emerging hydrogen agriculture will be an important direction in the new ***,we discuss several scientific problems in hydrogen agronomy,and suggest that the future of hydrogen agronomy depends on contributions by multiple *** future research directions of hydrogen agronomy include hydrogen agriculture in special environments,

关键词： Hydrogen gas(H2) Hydrogen agronomy New agriculture

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：