检索结果-南通市图书馆

Experimental investigation on debris flow resistance and entrainment characteristics:effects of the erodible bed with discontinuous grading

引用

Journal of Mountain Science 2022年第8期19卷 2397-2419页

作者： LI Pu WANG Jia-ding HU Kai-heng qiu hai-jun XIE Jia-lin State Key Laboratory of Continental Dynamics/Department of Geology Northwest UniversityXi'an 710069China Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of SciencesChengdu 610041China Institute of Mountain Hazards and Environment Chinese Academy of Sciences&Ministry of Water ConservancyChengdu 610041China College of Urban and Environmental Sciences Northwest UniversityXi'an 710127China

Debris flow deposits in natural channels typically have a wide grain size distribution(GSD).The effects of bed sediment GSD on the basal entrainment rate are neglected in current debris flow erosion *** investigations have detected three different vertical graded bedding structures:normal,inverse,and mixed-gradation,characterized by discontinuous gradation sediment and almost without intermediate-sized *** study conducted small-scale flume experiments to investigate the debris flow resistance forces and entrainment characteristics by incorporating the effects of discontinuous grading bed *** graded bed sediments with varying fine particle content,volumetric water content(VWC),and roundness were designed for *** flow resistance in erodible beds generally increased in the group with gravel of larger-sized coarse particle,lower roundness,and higher bed sediment *** discontinuous grading bed sediment,the entrained depths increased in the group with gravel of smaller coarse particle sizes,larger amounts of fine particles,and higher sediment roundness,and decreased with larger *** abnormality may be attributed to the disproportionately large effects of viscous flow resistance in our small-scale flume *** maximum erosion rates of the continuous bed sediment were higher than those of the corresponding discontinuous bed sediment with the same maximum coarse gravel *** is because,for discontinuous grading bed sediments,localized failure of intermediate-sized sediment grains may cause a large-scale collapse of the solid grain skeleton and enhance basal entrainment rates.A revised formula for calculating the debris flow entrainment rate is proposed by incorporating the kurtosis coefficient,which describes the distribution of discontinuous bed sediments and fine particle *** revised formula could facilitate an elaborate estimation of basin erosion and sediment runoff and reveal the development an

关键词： Debris flow Resistance force Entrainment characteristic Discontinuous gradation Roundness Entrainment model

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

Some Eigenvalue Properties of Third-order Boundary Value Problems with Distributional Potentials

引用

Acta Mathematicae Applicatae Sinica 2025年第1期41卷 179-199页

作者： hai-yan ZHANG Ji-jun AO College of Sciences Inner Mongolia University of TechnologyHohhot 010051China

Several eigenvalue properties of the third-order boundary value problems with distributional potentials are ***,we prove that the operators associated with the problems are self-adjoint and the corresponding eigenvalues are ***,the continuity and differential properties of the eigenvalues of the problems are given,especially we find the differential expressions for the boundary conditions,the coefficient functions and the ***,we show a brief application to a kind of transmission boundary value problems of the problems studied here.

关键词： third-order boundary value problems distributional potentials quasi-derivatives eigenvalues

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

Comparisons of{100}texture improvement and formability in hot-rolled non-oriented electrical steel by austenite-ferrite phase transformation and shear deformation

引用

Journal of Iron and Steel Research International 2025年第1期32卷 171-185页

作者： Chi-hao Yu Hong-jiang Pan Yan-ping Zhao De-ting Tang hai-jun Wang Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093YunnanChina School of Electronics and Information Engineering Anshun UniversityAnshun561000GuizhouChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina

Over the years,the high magnetic induction of industrial Mn-added electrical steel is assumed to be the enhancement of{100}texture derived from its austenite-ferrite phase transformation during hot rolling(phase transformation(PT)method).However,it is still undetermined without straightforward experimental *** reason for{100}texture improvement of Mn-added electrical steel is experimentally confirmed due to the recrystallization induced by the austenite-ferrite phase transformation during hot ***,a more promising methodology to further improve{100}texture and formability of hot-rolled electrical steel is promoted by the control of hot rolling deformation condition(shear deformation(SD)method).The results show that the nucleation mechanisms of{100}oriented recrystallized grains are different in the samples by SD and PT methods,which are in-depth shear deformation and austenite-ferrite phase transformation,*** this case,coarse{100}oriented recrystallized grains and low residual stress are obtained in the sample by SD method,which is responsible for its superior{100}texture and *** contrast,the sample by PT method forms fine recrystallized grains with random orientations and accumulates severe residual stress.

关键词： Non-oriented electrical steel {100}texture Formability Austenite-ferrite phase transformation Shear deformation

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

Structural engineering of high-entropy alloys for advanced electrocatalytic reactions

引用

Tungsten 2025年第1期7卷 1-31页

作者： Qiao Xie Ying-Jie Yu hai-jun Zhang Ya-Ping Deng Wen Lei The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Department of Chemical Engineering Waterloo Institute for Sustainable Energy Waterloo Institute for Nanotechnology University of Waterloo

High-entropy alloys(HEAs) have emerged as promising candidates to replace traditional precious metal catalysts,owing to their unique chemical and physical *** review commences by revisiting the fundamental concepts of HEAs,including their synthesis methods and structural control strategies in *** underscores the critical role of meticulously manipulating both macroscopic and microscopic structures of the HEAs to optimize their catalytic performance.A deep understanding of the structure-activity relationship in HEAs across various configurations is pivotal in developing more effective *** review methodically encapsulates the research progress of structural control strategies for HEAs in achieving efficient energy conversion,with the aim of gaining a better understanding of the relationship between structure and *** review concludes by summarizing the current achievements and challenges,and suggestions for potential future directions of HEAs in the fields of energy conversion and environmental purification.

关键词： Electrocatalytic Energy conversion High-entropy alloys Structural modulation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

雷达数字脉压在FPGA上的研究与实现

引用

计算机工程与科学 2009年第11期31卷 142-144页

作者：张学辉邱军海中国石油大学(华东)计算机与通信工程学院山东东营257061 烟台工程职业技术学院机电工程系山东烟台264006

采用FPGA技术实现雷达数字脉压,克服了DSP处理速度有限、实时性差的问题。本文以自行研制的雷达信号处理PCI卡为平台,详细介绍了数字脉压在FPGA芯片上实现的原理和过程,对脉压中的匹配滤波器进行了优化设计,解决了FP-GA资源相对有限的... 详细信息

采用FPGA技术实现雷达数字脉压,克服了DSP处理速度有限、实时性差的问题。本文以自行研制的雷达信号处理PCI卡为平台,详细介绍了数字脉压在FPGA芯片上实现的原理和过程,对脉压中的匹配滤波器进行了优化设计,解决了FP-GA资源相对有限的问题。最后说明了利用FPGA进行数字脉压的优势,为雷达数字脉压的工程实现提出了一条新思路。

关键词：雷达数字脉冲压缩 FPGA

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

利用铷钟实现组合导航系统研究

引用

通信学报 2006年第8期27卷 144-147,154页

作者：李廷军林雪原董文洪邱军海海军航空工程学院电子信息工程系山东烟台264001

介绍了双星定位系统(RDSS)的局限性,提出了利用高精度时钟,即铷钟作为接收机内部时钟,如接收机能够测量用户至卫星的伪距,在气压高度表的辅助下,双星定位系统可以与捷联惯导进行有效的伪距组合。仿真结果表明,组合后的导航系统具有输出... 详细信息

介绍了双星定位系统(RDSS)的局限性,提出了利用高精度时钟,即铷钟作为接收机内部时钟,如接收机能够测量用户至卫星的伪距,在气压高度表的辅助下,双星定位系统可以与捷联惯导进行有效的伪距组合。仿真结果表明,组合后的导航系统具有输出导航参数误差小的特点,为发展双星定位系统提出了一条新的思路。

关键词：铷钟双星定位系统伪距组合气压高度表

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

Modified Pulsatilla decoction alleviates 5-fluorouracil-induced intestinal mucositis by modulating the TLR4/MyD88/NF-κB pathway and gut microbiota

引用

World Journal of Gastroenterology 2025年第7期31卷 110-129页

作者： Yi-Tong qiu Xin-Yi Luo Ya-Feng Deng Xue Zheng Jian-Guo qiu Lin-Sheng Zhang Xiao-Qi Huang Xue-Bao Zheng hai-Yang Huang School of Pharmaceutical Sciences Guangzhou University of Chinese MedicineGuangzhou 525000Guangdong ProvinceChina Druggability Research Team Dongguan Institute of Guangzhou University of Chinese MedicineDongguan 523808Guangdong ProvinceChina Institute of Traditional Chinese Medicine Dongguan Hospital of Traditional Chinese MedicineDongguan 523000Guangdong ProvinceChina

BACKGROUND Modified Pulsatilla decoction(PD),a PD with licorice and ejiao,is a classic Traditional Chinese Medicine formula with significant efficacy in treating intestinal mucositis(IM)induced by tumor ***,its specific molecular and biological mechanisms remain *** To investigate the therapeutic effect and mechanism of modified PD in *** This study used an IM mouse model established using 5-fluorouracil injections to investigate the effects of the modified PD(3,6,and 12 g/kg)in *** primary chemical components of the modified PD were identified using liquid chromatography-mass *** weight loss,diarrhea scores,intestinal length,histopathological scores,and inflammatory cytokine levels were measured to evaluate the effects of the modified PD in *** on the TLR4/MyD88/NF-κB pathway were evaluated using western blot *** intestinal microbiota was characterized using Illumina NovaSeq *** The results showed that modified PD significantly improved weight loss and diarrhea and shortened the intestines in IM ***,modified PD suppressed the TLR4/MyD88/NF-κB pathway and downregulated the expression of reactive oxygen species,lipopolysaccharides,and pro-inflammatory cytokines(IL-1β,TNF-α,IFN-γ,IL-6,IL-8,and IL-17),while increasing the expression of the anti-inflammatory cytokine ***,modified PD protected the intestinal mucosal barrier by increasing the expression of tight junction proteins(occludin-1,claudin-1,and ZO-1)and ***,16S rDNA sequencing revealed that modified PD improved intestinal *** Our research offers new insights into the potential mechanism of modified PD in alleviating IM and provides experimental evidence supporting its pharmaceutical application in clinical IM treatment.

关键词： Modified Pulsatilla decoction Intestinal mucositis Oxidative stress Gut microbiota,TLR4/MyD88/NF-κB pathway Inflammatory response

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

Development and validation of a nomogram prediction model for overall survival in patients with rectal cancer

引用

World Journal of Gastrointestinal Oncology 2025年第2期17卷 93-104页

作者： Ling Liang Xiao-Sheng Li Ze-jun Huang Zu-hai Hu Qian-Jie Xu Yu-Liang Yuan Wei Zhang hai-Ke Lei Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment Chongqing University Cancer HospitalChongqing 400030China Chongqing Cancer Multiomics Big Data Application Engineering Research Center Chongqing University Cancer HospitalChongqing 400030China Department of Health Statistics School of Public HealthChongqing Medical UniversityChongqing 400016China

BACKGROUND Rectal cancer is prevalent and associated with substantial morbidity and *** To develop a nomogram prediction model for overall survival(OS)in patients with rectal cancer by leveraging a comprehensive analysis of demographic,clinicopathological,haematological,and follow-up data to identify independent prognostic *** We conducted a prospective cohort study in China involving rectal cancer patients and applied Cox regression and least absolute shrinkage and selection operator regression to assess the significance of various variables as independent prognostic factors for *** identified factors were integrated into a nomogram model,which was evaluated for predictive accuracy via the C-index,area under the curve(AUC),calibration curve,and decision curve analysis(DCA).RESULTS Multivariate analysis revealed independent predictors of OS,including the Karnofsky performance status,age,sex,TNM stage,chemotherapy,surgery,targeted therapy,β2-microglobulin,lactate dehydrogenase,and the neutrophil-to-lymphocyte *** nomogram demonstrated a C-index of 0.80 for the training and validation cohorts,with AUC values indicating high predictive accuracy for 1-year,3-year,and 5-year *** calibration curves confirmed the model's excellent agreement with the observed survival rates,and DCA revealed the superior clinical utility of the nomogram over the TNM staging *** In this study,a novel prognostic model that accurately predicts the OS of rectal cancer patients was *** model exhibited excellent discriminatory and calibration capabilities,thus offering a reliable tool for health care professionals to estimate patient survival.

关键词： Rectal cancer Overall survival Nomogram Prognosis

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

Mass organic matter accumulation induced by rapid redox variations in lakes:Evidence from the Miaoxi area,Bohai Bay Basin,China

引用

Journal of Palaeogeography 2025年第01期14卷 291-313页

作者： Peng Sun hai-Feng Yang Fei-Long Wang jun-Pei Yue Yan-Fei Gao You-jun Tang School of Petroleum Engineering Yangtze University Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Yangtze University Tianjin Branch of China National Offshore Oil Corporation College of Resource and Environment Yangtze University

The Member 4 of the Paleogene Shahejie Formation(Es4) in the Bohai Bay Basin is interspersed with a set of high-quality source rocks typified as intercalation of red and black mudstones. A large amount of petroleum(crude oil) originates from these source rocks. The Paleocene-Eocene Thermal Maximum(PETM)event occurred during the deposition of Es4 in the Bohai Bay Basin, and the organic matter enrichment model under this event is worth further investigation due to its relationship with and influence on petroleum accumulations. Well LK25-A, as the first oil exploration well drilled into the Es4 in Miaoxi area, serves as a valuable case to study organic matter accumulation. In this study, we integrate total organic carbon(TOC),Rock-Eval pyrolysis, microscopic observation, vitrinite reflectance(VRo), elemental analysis, and gas chromatography-mass spectrometry(GC-MS) to evaluate the hydrocarbon generation potential, organic matter types, thermal maturity, and sedimentary environment of the Es4 in Miaoxi area. The analysis of maceral and rock pyrolysis data reveals that Type I and Type II organic matter make up the majority of Paleogene mudstones in this region. The TOC and rock pyrolysis data show that mudstones in this area have high organic matter abundance and oil-generation potential. The measured vitrinite reflectance distribution of mudstone samples, which ranges from 0.3% to 0.74%, demonstrates that the Paleogene strata are at the immature to mature stage, and the samples from this area contain a sizable amount of bituminite and mineralbituminous groundmass. The analysis of biomarkers in the mudstone samples indicates that most of the mudstones in this area are in lacustrine and brackish-hypersaline lacustrine environment under a reducing condition, and some of the red mudstones in the Es4 are formed under a suboxic condition. Based on the size and morphology of the pyrite framboid, the redox conditions of the water mass during deposition or diagenesis are further

关键词： Hydrocarbon generation potential Biomarkers Optical microscopy Pyrite framboid Elemental geochemistry Red–black beds

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Subsection cooling system of hot rolling silicon steel and its industrial application

引用

Journal of Iron and Steel Research International 2025年第1期32卷 159-170页

作者： qiu-na Wang Ji-quan Sun Li-po Yang hai-shen Wang Li-jie Dong Jie-ming Li Zhen-yang Zhi Yan-wen Bi National Engineering Research Center of Flat Rolling Equipment University of Science and Technology BeijingBeijing100083China Hot Rolling Department of Qian’an Iron and Steel Corporation Shougang Company LimitedTangshan064404HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

An online subsection cooling method for hot rolling silicon steel was designed to achieve local adjustment of transverse roll ***,it was able to meet the requirements of edge drop of the strip by using the features of online thermal ***,after the new subsection spray beam was installed at the exit of mill,the special local cooling rules were analyzed for altering the thermal crown of roll according to rolling process ***,the dynamic impact of subsection cooling on the local thermal crown could just be obtained according to the measured ***,the heat transfer coefficient was determined by different subsection cooling curves under varied rolling ***,the rolling rhythm and variable conditions were important dynamic factors of transient roll temperature in practical rolling ***,real-time calculation and presetting of the thermal crown were carried out to maximize special requirements of load roll gap on local strip *** this new method,the transient temperature and the thermal crown of roll could be quantitatively controlled *** the practical results showed that the predicted temperature was able to match the measured value by more than 95%.Meanwhile,the adjustable range of thermal crown increased by more than 2.5 ***,the qualification rate of strip edge crown has increased from the original 30%to over 70%.

关键词： Subsection cooling Thermal roll crown Multi-parameter coupling Hot rolling Silicon steel

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：