检索结果-南通市图书馆

Dietary crude protein time-dependently modulates the bacterial community and metabolites and changes dietary nutrient efficiency in growing pigs

引用

Animal Nutrition 2024年第2期17卷 1-10页

作者： Yuming Wang Junyan Zhou Ning Cao Lu Wang jiayu tu Xiangfang Zeng Shiyan Qiao State Key Laboratory of Animal Nutrition and Feeding Institute of Animal Sciences of Chinese Academy of Agricultural Sciences Animal Science and Technology College Beijing University of Agriculture State Key Laboratory of Animal Nutrition and Feeding Ministry of Agriculture Feed Industry CentreChina Agricultural University

The reduced nutrient digestibility of low-protein(LP) diets has been shown to be caused by the weakened fermentative capacity of the post-gut flora. The dynamic regulation of dietary protein contents on post-gut microbial population and fermentative metabolism is unclear. Twelve growing barrows(19.9 ± 0.8 kg) fitted with a T-cannula at the blind end of the cecum were randomly administered a highprotein(HP, 21.5% crude protein [CP]) diet or an LP(15.5% CP) diet for 28 d. The cecal content and feces were collected at d 1, 14, and 28 of the experiment for microflora structures and metabolite concentrations analysis. The nutrient digestibility coefficient and plasma biochemical parameters were also determined. Compared with the HP treatment, the LP treatment showed decreased plasma urea nitrogen concentration and apparent total tract digestibility of dry matter, gross energy, and CP(P < 0.01). In addition, urinary nitrogen losses, total nitrogen losses, and daily nitrogen retention in the LP treatment were lower than those in the HP treatment(P < 0.01), and the nitrogen retention-to-nitrogen intake ratio in the LP treatment was increased(P < 0.01). The HP group showed increased cecal total short-chain fatty acids(SCFA) concentration and fecal propionate, butyrate, and total SCFA concentrations(P < 0.05) on d 14 and 28, which may be mainly related to the elevated abundance of SCFA-producing bacteria, such as Ruminococcus, Lactobacillus, and Prevotella(P < 0.05). Probiotics, such as Bifidobacterium, Bacteroidales S24-7, and Rikenella, enriched in the LP treatment possibly contributed to reduced plasma endotoxin content. The differences in the abundances of almost all the above-mentioned flora appeared on d 28 but not d 14. Likewise, differences in the Simpson and Shannon indices and clustering patterns of the microbiota between treatments were also only observed on d 28. To sum up, in a time-dependent manner, the LP diet increased probiotics with gut-improving functions a

关键词： Low-protein diet Microorganism Nutrient digestibility Pig Short-chain fatty acid

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

基于大数据分析的水环境风险预测模型研究

引用

科学技术创新 2024年第10期 24-27页

作者：屠佳钰上海勘测设计研究院有限公司上海

目前,随着3S等新技术的发展,形成了包括数学模型与3S的结合、数学模型与人工神经网络相结合的不同的模型计算方式。今后需要进一步研究如何将水环境模型和大数据技术更好地进行融合,深入挖掘模型应用并充分发挥其应用价值。通过大数据... 详细信息

目前,随着3S等新技术的发展,形成了包括数学模型与3S的结合、数学模型与人工神经网络相结合的不同的模型计算方式。今后需要进一步研究如何将水环境模型和大数据技术更好地进行融合,深入挖掘模型应用并充分发挥其应用价值。通过大数据分析的流域性水环境风险预测模型,如对整个长江流域进行预测预警,将有助于更完整更系统得对长江流域进行管控,能够更及时更有效的预警,解决优化调控类科学决策问题。

关键词：大数据水环境风险预测模型

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

基于能值的海岸带生态修复成效评估——以鹦鹉洲湿地为例

引用

华东师范大学学报（自然科学版） 2024年第1期 68-78页

作者：丁睿陈雪初由文辉屠佳雨华东师范大学生态与环境科学学院上海200241 上海市金山区海洋海塘管理所上海200540

鹦鹉洲湿地自建成以来已开展了连续5年以上的实地调查和监测,结合长期监测数据构建科学系统的修复成效评价体系对海岸带生态修复工程的评估具有重要的参考价值.采用能值分析方法,通过实地调研、科学监测和查阅文献,搜集所需相关数据,构... 详细信息

鹦鹉洲湿地自建成以来已开展了连续5年以上的实地调查和监测,结合长期监测数据构建科学系统的修复成效评价体系对海岸带生态修复工程的评估具有重要的参考价值.采用能值分析方法,通过实地调研、科学监测和查阅文献,搜集所需相关数据,构建了湿地生态系统能量分析结构图和能值指标体系,对自然资产、生态服务等主要能值指标进行了分析,并比较了不同修复时期湿地的功能表现.研究结果表明:2021年,鹦鹉洲湿地自然资产总能值为8.92×1016 sej,相当于能值–货币价值22.47万元,湿地生态服务总能值为8.88×1017 sej·a^(-1);实施生态修复后,鹦鹉洲生态质量明显改善,其自然资产和生态服务能值分别是修复前的5.01倍和5.73倍;鹦鹉洲湿地生态系统的能值自给率(emergy self-support ratio,ESR)为0.47,能值产出率(emergy yield ratio,EYR)和能值可持续指数(emergy sustainable index,ESI)分别为28.29和25.03,表明湿地产出效率高且可持续发展空间较大.研究显示:基于长期监测数据,采用能值分析方法可较好地反映海岸带生态修复工程成效,所构建的评估体系及方法可为类似海岸带修复工程提供参考.

关键词：海岸带生态修复成效评估能值分析鹦鹉洲湿地

来源：

维普期刊数据库

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

Random vibration analysis of FGM plates subjected to moving load using a refined stochastic finite element method

引用

Defence Technology（防务技术） 2024年第4期34卷 42-56页

作者： Ngoc-tu Do Trung Thanh Tran Faculty of Mechanical Engineering Hanoi University of IndustryHanoiViet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam

The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte Carlo simulation(MCS), so-called refined stochastic finite element method to investigate the random vibration of functionally graded material(FGM) plates subjected to the moving *** advantage of the proposed method is to use r-FSDT to improve the accuracy of classical FSDT, satisfy the stress-free condition at the plate boundaries, and combine with MCS to analyze the vibration of the FGM plate when the parameter inputs are random quantities following a normal distribution. The obtained results show that the distribution characteristics of the vibration response of the FGM plate depend on the standard deviation of the input parameters and the velocity of the moving ***, the numerical results in this study are expected to contribute to improving the understanding of FGM plates subjected to moving loads with uncertain input parameters.

关键词： FGM Moving load R-FSDT Q4 element Monte Carlo simulation Random vibration

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

Single-cell transcriptomics reveals tumor landscape in ovarian carcinosarcoma

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第8期25卷 686-699页

作者： Junfen XU Mengyan tu Department of Gynecologic Oncology Women’s HospitalZhejiang University School of MedicineHangzhou 310006China Zhejiang Provincial Clinical Research Center for Obstetrics and Gynecology Hangzhou 310006China

Objective:The present study used single-cell RNA sequencing(scRNA-seq)to characterize the cellular composition of ovarian carcinosarcoma(OCS)and identify its molecular ***:scRNA-seq was performed in resected primary OCS for an in-depth analysis of tumor cells and the tumor *** staining was used for *** scRNA-seq data of OCS were compared with those of high-grade serous ovarian carcinoma(HGSOC)tumors and other OCS ***:Both malignant epithelial and malignant mesenchymal cells were observed in the OCS patient of this *** identified four epithelial cell subclusters with different biological *** them,epithelial subcluster 4 presented high levels of breast cancer type 1 susceptibility protein homolog(BRCA1)and DNA topoisomerase 2-α(TOP2A)expression and was related to drug resistance and cell *** analyzed the interaction between epithelial and mesenchymal cells and found that fibroblast growth factor(FGF)and pleiotrophin(PTN)signalings were the main pathways contributing to communication between these ***,we compared the malignant epithelial and mesenchymal cells of this OCS tumor with our previous published HGSOC scRNA-seq data and OCS *** the epithelial subclusters in the OCS tumor could be found in the HGSOC ***,the mesenchymal subcluster C14 exhibited specific expression patterns in the OCS tumor,characterized by elevated expression of cytochrome P450 family 24 subfamily A member 1(CYP24A1),collagen type XXIIIα1 chain(COL23A1),cholecystokinin(CCK),bone morphogenetic protein 7(BMP7),PTN,Wnt inhibitory factor 1(WIF1),and insulin-like growth factor 2(IGF2).Moreover,this subcluster showed distinct characteristics when compared with both another previously published OCS tumor and normal ovarian ***:This study provides the single-cell transcriptomics signature of human OCS,which constitutes a new resource for elucidating OCS diversity.

关键词： Ovarian carcinosarcoma Single-cell RNA sequencing(scRNA-seq) tumor heterogeneity

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

基于交通时空特征的车辆全局路径规划算法

引用

汽车安全与节能学报 2021年第1期12卷 52-61页

作者：杜茂杨林金悦涂家毓上海交通大学机械与动力工程学院中国上海200240

为降低混合动力汽车(HEV)的出行时间和出行能耗,提出了一种基于时空动态交通信息的路径规划算法。分析了影响车辆通行时间和全程最低能耗的因素。一种基于广义回归网络(GRNN)模型,拟合计算了道路通行时间以及整体路径的全程能耗。构建... 详细信息

为降低混合动力汽车(HEV)的出行时间和出行能耗,提出了一种基于时空动态交通信息的路径规划算法。分析了影响车辆通行时间和全程最低能耗的因素。一种基于广义回归网络(GRNN)模型,拟合计算了道路通行时间以及整体路径的全程能耗。构建了基于并行A*算法的车辆路径规划算法,为确定起终点位置后的车辆,规划了一条耗时更短、更加节能的路径。进行了仿真对比试验。结果表明:相比于依据平均车速与道路功率的计算方法,该算法能够获得更优的出行路径,可降低车辆能耗11%以上,缩短行车时间13%以上。因而,该算法可为车辆规划更优的路径。

关键词：混合动力汽车(HEV) 城市交通路径规划时空搜索

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

An integrated MINLP model for multi-party coordination in downstream oil supply chain

引用

Petroleum Science 2024年第3期21卷 2066-2079页

作者： Rui Qiu Bo Zhang Wei Zhao Ren-Fu tu Man-Qiu He Qi Liao Yong-tu Liang National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum-BeijingFuxue Road No.18Changping DistrictBeijing102249PR China Strategy&Implementation Department PipeChinaDongtucheng Road No.5Chaoyang DistrictBeijing100013PR China

Cooperation among enterprises can bring overall and individual performance improvement,and a smooth coordination method is ***,due to the lack of customized coordination methods,cooperation in the downstream oil supply chain cannot be carried out *** paper intends to propose a multi-party coordination method to promote cooperation between oil shippers and pipeline operator by optimizing oil transportation,oil substitution and pipeline pricing *** integrated game-theoretic modeling and analysis approach is developed to characterize the operation behaviors of all stakeholders in the downstream oil supply *** proposed mixed integer nonlinear programming model constrains supply and demand capacity,transportation routes,oil substitution rules and pipeline freight *** transformation and price discretization are introduced for model linear *** experiments are carried out in the oil distribution system in South *** results show that compared to the business-as-usual scheme,the new scheme saves transportation cost by 3.48%,increases pipeline turnover by 5.7%,and reduces energy consumption and emissions by 7.66%and 6.77%.It is proved that the proposed method improves the revenue of the whole system,achieves fair revenue distribution,and also improves the energy and environmental benefits of the oil supply chain.

关键词： Downstreamoil supplychain Multi-partycoordination Cooperative game Mixed integernonlinear programming model Pipeline transportation Revenue distribution

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

Equivalence between the internal observability and equation

引用

Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 89-97页

作者： LIU Wen-jun tu Zhi-yu School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjing 210044China

This paper is concerned with a third order in time linear Moore-Gibson-Thompson equation which describes the acoustic velocity potential in ultrasound wave *** by the work of Kaltenbacher,Lasiecka and Marchand(Control Cybernet.2011,40:971-988),we establish an observability inequality of the conservative problem,and then discuss the equivalence between the exponential stabilization of a dissipative system and the internal observational inequality of the corresponding conservative system.

关键词： Moore-Gibson-Thompson equation internal observability exponential 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

Sobolev Mapping of the Bergman Projections on Generalized Hartogs Triangles

引用

Acta Mathematica Sinica,English Series 2024年第2期40卷 451-466页

作者： Hong Yan LIU Zhen Han tu School of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China

In this paper,we investigate Sobolev mapping properties of the Bergman *** domain we focus on is defined byΩm/n:={(z,w)∈C^(1+N):|w1|<|z|m1/n1<1,…|wN|<|z|/m_(N)/n_(N)<1},where m=(m1,…mN)∈(Z^(+))^(N),n=(n1,…nN)∈(Z^(+))N,N∈Z^(+).Sobolev irregularity of the Bergman projections on 2 is *** also prove some Sobolev regularity results of the Bergman projections onΩm/n for m=(1,…1).

关键词： Bergman projections generalized Hartogs triangles Sobolev spaces

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

Core-shell mesoporous carbon hollow spheres as Se hosts for advanced Al-Se batteries

引用

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 899-906页

作者： Haiping Lei Tianwei Wei Jiguo tu Shuqiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Incorporating a selenium(Se)positive electrode into aluminum(Al)-ion batteries is an effective strategy for improving the overall battery ***,the cycling stability of Se positive electrodes has challenges due to the dissolution of intermediate reaction *** this work,we aim to harness the advantages of Se while reducing its limitations by preparing a core-shell mesoporous carbon hollow sphere with a titanium nitride(C@TiN)host to load 63.9wt%Se as the positive electrode material for Al-Se *** the physical and chemical confinement offered by the hollow mesoporous carbon and TiN,the obtained core-shell mesoporous carbon hollow spheres coated with Se(Se@C@TiN)display superior utilization of the active material and remarkable cycling *** a result,Al-Se batteries equipped with the as-prepared Se@C@TiN composite positive electrodes show an initial discharge specific capacity of 377 mAh·g^(-1)at a current density of 1000 mA·g^(-1)while maintaining a discharge specific capacity of 86.0 mAh·g^(-1)over 200 *** improved cycling performance is ascribed to the high electrical conductivity of the core-shell mesoporous carbon hollow spheres and the unique three-dimensional hierarchical architecture of Se@C@TiN.

关键词： aluminum-selenium batteries intermediate products core-shell mesoporous carbon hollow sphere cycling performance

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：