检索结果-内蒙古大学图书馆

建筑结构学报 2025年第1期46卷 19-29页

作者：张旭乔肖绪文朱彤张勇波张磊张志超丛峻武朝军李罡中建工程试验检测(北京)有限公司北京101300 中国建筑股份有限公司技术中心北京101300 中建工程产业技术研究院有限公司北京101300 中国建筑第六工程局有限公司天津300171 济南交通发展投资有限公司山东济南250013 济南轨道交通集团有限公司山东济南250013

为研究大直径钢筋装配式混凝土框架抗震性能,对三层两跨大直径钢筋装配式混凝土足尺框架进行拟动力试验,分析框架在地震设防三标准下的破坏形态、动力时程反应及抗震性能指标。研究结果表明:多遇地震作用下,框架并未出现裂缝,处于弹性状... 详细信息

为研究大直径钢筋装配式混凝土框架抗震性能,对三层两跨大直径钢筋装配式混凝土足尺框架进行拟动力试验,分析框架在地震设防三标准下的破坏形态、动力时程反应及抗震性能指标。研究结果表明:多遇地震作用下,框架并未出现裂缝,处于弹性状态;设防地震作用下,框架出现微裂缝,试验结束时裂缝闭合;罕遇地震作用后,框架进入弹塑性状态。以承载力和残余变形确定使用性能时,多遇地震作用下达到抗震性能3(完好);设防地震作用下,达到抗震性能4(轻到中等破坏);罕遇地震作用下,达到抗震性能4(不严重破坏);各地震工况下,框架底部剪力-层间位移角曲线基本呈线性,具有较好的滞回性能;罕遇地震后,柱主筋均未屈服,一、二层梁端主筋屈服,实现了“强柱弱梁”的设计目标。同时,对大直径钢筋框架和普通直径钢筋框架进行有限元对比分析,两者各层层间位移以及层间剪力均值相对误差分别为-5.73%和-1.41%,动力性能接近。

关键词：混凝土框架大直径钢筋装配式拟动力试验抗震性能

来源：评论

学校读者我要写书评

暂无评论

废弃防水卷材资源化基本问题与发展路径研究

引用

中国工程科学 2023年第5期25卷 210-221页

作者：肖建庄俞才华肖绪文丁陶张勇同济大学土木工程学院上海200092 广西大学土木建筑工程学院南宁530004 中国建筑防水协会北京100831

建筑固体废物(固废)资源化是建筑业高质量发展的必然要求,在“双碳”战略目标的驱动下进一步提升建筑固废资源化利用率迫在眉睫。废弃防水材料作为建筑固废的重要组成部分,其资源化研究基本处于空白状态。本文测算了2005—2021年我国防... 详细信息

建筑固体废物(固废)资源化是建筑业高质量发展的必然要求,在“双碳”战略目标的驱动下进一步提升建筑固废资源化利用率迫在眉睫。废弃防水材料作为建筑固废的重要组成部分,其资源化研究基本处于空白状态。本文测算了2005—2021年我国防水材料总产量(2.983×10^(10) m^(2))、防水卷材总产量(1.89×10^(10) m^(2)),形成了防水材料资源化的主体是防水卷材资源化的基本判断。应对国家绿色低碳发展形势,提出了针对防水卷材的减量化、重复利用、循环再生(3R)资源化路径,防水卷材“基因组”、多尺度/多场景分析、机器学习预测相结合的高性能防水卷材研发理念,明晰了以体系拆解为核心的防水卷材重复利用模式、以“分类”“分级”“分解”为关键构成的废弃防水卷材循环再生策略。应以再生防水卷材为主攻方向,推动全再生防水卷材、增材制造技术的深入研究和创新应用。面向防水卷材资源化未来发展,“原料‒产品”“产品‒工程”是亟待攻克的关键环节,需要管理部门、学术界、工业界共同努力。

关键词：废弃防水卷材资源化利用减量化重复利用循环再生全再生防水卷材

来源：评论

学校读者我要写书评

暂无评论

The Pararectus approach in acetabular fractures treatment: functional and radiologcial results

引用

BMC MUSCULOSKELETAL DISORDERS 2022年第1期23卷 370-370页

作者： Liu, Guoming Chen, Jinli Liang, Chengzhi zhang, Chengdong Li, xuwen Hu, Yanling Qingdao Univ Dept Orthoped Affiliated Hosp Qingdao 266003 Shandong Peoples R China

Background The surgical treatment of complex acetabular fractures is one of the most challenging procedures for orthopedic surgeons. The Pararectus approach, as a reasonable alternative to the existing surgical procedures, was performed for the treatment of acetabular fractures involving the anterior column. This study aimed to evaluate outcome using the Pararectus approach for acetabular fractures involving anterior columns. Methods Thirty-seven with displaced acetabular fractures involving anterior columns were treated between July 2016 and October 2019 using the Pararectus approach. The functional outcomes (using the Merle d Aubigne and Postel scoring system, WOMAC and modified Harris scoring), the quality of surgical reduction (using the Matta criteria), and postoperative complications were assessed during approximately 26 months follow-up period. Results Thirty-seven patients (mean age 53 years, range: 30-71;28 male) underwent surgery. Mean intraoperative blood loss was 840 ml (rang: 400-2000 ml) and mean operating time was 210 min (rang: 140-500 min). The modified Merle d Aubigne score was excellent and good in 27 cases (73%), fair in 6 cases (16%), and poor in 3 cases (11%). The mean score was 88.5 (range:77-96) for the modified Harris Hip scores, and 22 (range:7-35) for the WOMAC scores after operation. Postoperative functional outcomes were significantly improved compared with preoperative outcomes (P < 0.0001). The quality of reduction was anatomical in 21 cases (57%), satisfactory in 9 cases (24%), and unsatisfactory in 7 cases (19%). At follow-up, four patients developed a DVT, and heterotopic bone formation was observed in one patient. The hip osteoarthritis was not observed. Conclusion The Pararectus approach achieved good functional outcomes and anatomical reduction in the treatment of acetabular fractures involving anterior column with minimal access morbidity.

关键词： Acetabular fracture Pararectus approach Surgical exposure Outcome Radiological results

来源：评论

学校读者我要写书评

暂无评论

Exploring the mechanism of sweetener neohesperidin dihydrochalcone on oral tolerance via a network pharmacology approach combined with vivo and vitro methods

引用

JOURNAL OF FUNCTIONAL FOODS 2022年第0期95卷

作者： Shi, Xiaolei Wei, Jihao zhang, Yupu Xue, Jingwen Jin, Yongri Li, xuwen Jilin Univ Coll Food Sci & Engn Changchun Peoples R China Jilin Univ Coll Chem Changchun Peoples R China JilinState Tobacco Monopoly Adm Changchun Peoples R China Jilin Univ Coll Chem 2699 Qianjin Rd Changchun 130012 Peoples R China

Neohesperidin dihydrochalcone (NHDC) is a kind of sweetener widely used in food processing. Some artificial sweeteners induce food allergy by breaking oral tolerance (OT). The relationship between NHDC and oral tolerance are important in food safety. We explored the possible effects of NHDC on OT via network pharmacology combined with vivo and vitro experiments. NHDC was predicted to have effects on OT. It was focus on immunoglobulin production, inflammation and immunity. Then, OT mouse model and mast cell degranulation were applied to further explore the mechanism. NHDC could affect the Th2 response by suppressing the sIgG1 level in the serum and GATA-3 expression in the colon. NHDC could inhibit RBL-2H3 cells degranulation by suppressing the Ca2+ influx and MAPK signaling pathways. Results showed that NHDC can be safely applied in food processing and had promotional effects on oral tolerance.

关键词： Sweetener Tolerance Food allergy Risk Mechanism Food safety

来源：评论

学校读者我要写书评

暂无评论

Submarine Continental Slopes Stability Prediction of Natural Gas HydratesBased on Machine Learning

Submarine Continental Slopes Stability Prediction of Natural...

引用

Offshore Technology Conference, OTC 2025

作者： Chen, Yu He, Yufa Wang, Yixuan Zhou, Yunjian Fu, Qiang Qin, xuwen Liu, Dingyuan Tian, Zheng zhang, Kexin CNOOC Research Institute Ltd State Key Laboratory of Offshore Natural Gas Hydrates Beijing China Huairou Laboratory Beijing China China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Beijing China

ISBN: (纸本)9781959025610

In the process of extracting naturally-occurring oceanic gas hydrates, the dissociation of hydrates can causea reduction in soil strength. This reduction has the potential to trigger slope failure and submarine landslides,which present a catastrophic threat to offshore facilities and hydrate production. This research aims to create a robust and accurate machine-learning model that can efficiently predict stability of submarine continental slopes where gas hydrates are widespread. By collecting and analyzing 144 relevant cases, a comprehensive dataset was constructed, incorporating slope basic data, overlying and underlying layer data, and geological parameters of the hydrate layer. After conducting a correlation coefficient analysis between the characteristic parameters of the dataset and the output, the key characteristic parameters were determined. To model the dataset and assess its performance, four machine learning techniques were employed: Random Forest(RF), XGBoost, K-Nearest Neighbors (KNN), and Support Vector Machine (SVM). Formation physical parameters, geotechnical parameters, and NGH parameters were taken as input parameters, and the stability of NGH slopes was taken as prediction indicator. Evaluation metrics such as the ROC and confusion matrix were employed to comprehensively evaluate these models’ classification ability. Among these algorithms,the RF algorithm achieves the best prediction accuracy and AUC value, demonstrating its potential in submarine continental slopes stability prediction of natural gas hydrates. Additionally, sensitive analysis using Gini impurity calculations revealed that hydrate decomposition degree is the most significant factor affecting slope stability, followed by the burial depth and thickness of the hydrate layer. The slope angle,cohesion, and internal friction angle also have significant impacts. This study provides a new perspective for predicting submarine continental slopes stability with NGH and offers a scientific

关键词： Landslides

来源：评论

学校读者我要写书评

暂无评论

Light and temperature dual responsive pesticide release system based on mesoporous silica nanoparticles modified by dopamine

引用

Journal of Central South University 2022年第2期29卷 397-409页

作者： xuwen-shuang YANG Zhou-xiao-shuang zhang Guang-yang LIU Hui Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Yongzhou Vocational Technical College Yongzhou 425100China

A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and *** dual responsive behaviors of MSNs-g-PVNM were systematically *** imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,*** release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 *** loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three *** was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.

关键词： N-vinylcaprolactam controlled release system stimuli-responsive mesoporous silica nanoparticles imidacloprid

来源：评论

学校读者我要写书评

暂无评论

THE UNCONDITIONAL UNIQUENESS FOR THE ENERGY-SUPERCRITICAL NLS

arXiv

引用

arXiv 2021年

作者： Chen, xuwen Shen, Shunlin zhang, Zhifei Department of Mathematics University of Rochester RochesterNY14627 United States School of Mathematical Sciences Peking University Beijing100871 China

We consider the cubic and quintic nonlinear Schrödinger equations (NLS) under the d and Td energy-supercritical setting. Via a newly developed unified scheme, we prove the unconditional uniqueness for solutions to NLS at critical regularity for all dimensions. Thus, together with [19, 20], the unconditional uniqueness problems for H1-critical and H1-supercritical cubic and quintic NLS are completely and uniformly resolved at critical regularity for these domains. One application of our theorem is to prove that defocusing blowup solutions of the type in [59] are the only possible (Equation presented) solutions if exist in these domains. Copyright © 2021, The Authors. All rights reserved.

关键词： Nonlinear equations

来源：评论

学校读者我要写书评

暂无评论

A novel nano-thermite system with BiOF as fluorine-containing oxidant for enhanced energy release performance

引用

CHEMICAL ENGINEERING JOURNAL 2023年第1期468卷

作者： Li, Jingwei Liu, xuwen Huang, Qian Liu, Feifan Xie, Quanmin Hu, Maocong Su, Jiaxin zhang, Chengchen Zeng, Yuyang Zhu, Chenguang Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China Shaanxi Appl Phys Chem Res Inst Sci & Technol Appl Phys Chem Lab Xian 710061 Peoples R China

The reduced diffusion distance of nano-thermite results in an exceptionally high energy release rate and intense exothermic reactions upon ignition, which has drawn significant interest from researchers in the field of energetic materials. With the deepening of research, metal fluorides are gradually favored by researchers because of their unique reaction characteristics. This paper presents the synthesis of a new fluorine-containing oxidant, BiOF, and its use in the preparation of a novel nano-thermite with n-Al. BiOF crystals exhibit a unique microscopic morphology and are interlaced into "nanoflower" microspheres, which allows for good interfacial contact between the oxidant and fuel during the recombination process. The resulting n-Al/BiOF system displays excellent ignition and combustion performance, with a combustion temperature higher than the boiling point of its main combustion products, AlF3 and Bi. Compared with n-Al/CuO and n-Al/MoO3 systems, n-Al/BiOF exhibits a higher flame propagation rate under confinement. In addition, the ignition threshold of the n-Al/BiOF system is also smaller than that of the n-Al/CuO and n-Al/MoO3 systems. Furthermore, the paper examines the reaction mechanism of the n-Al/BiOF system through thermal reaction path analysis and combustion and thermal analysis product characterization. The paper discovers a "pre-ignition" reaction mechanism before the ignition temperature, where the strongly electronegative fluorine in BiOF corrodes the Al2O3 shell, promoting the release of aluminum energy. The synergistic and effective interaction between oxygen, fluorine, and fuel aluminum in the n-Al/BiOF system results in efficient energy release performance, making BiOF a promising candidate for n-Al based reactive materials in propellants, explosives, and pyrotechnic products.

关键词： Nano-thermites Nanostructured energetic materials Conformational relationships Fluorinated oxidizing agent Pre-ignition reaction

来源：评论

学校读者我要写书评

暂无评论

容积弧形动态旋转调强与固定野调强放疗技术在乳腺癌根治术后患者中的剂量学分布特征

引用

四川解剖学杂志 2024年第2期32卷 17-20页

作者：张敬慧徐文中河南科技大学第一附属医院肿瘤放疗科洛阳471000

目的:探讨乳腺癌根治术后患者开展容积弧形动态旋转调强放疗(VMAT)与固定野调强放疗(IMRT)技术的剂量学分布.方法:选取本院2022年2月至2023年6月收治的60例乳腺癌患者作为研究对象.采用随机数字表法将其分为研究组(n=30,采用VMAT技术)... 详细信息

目的:探讨乳腺癌根治术后患者开展容积弧形动态旋转调强放疗(VMAT)与固定野调强放疗(IMRT)技术的剂量学分布.方法:选取本院2022年2月至2023年6月收治的60例乳腺癌患者作为研究对象.采用随机数字表法将其分为研究组(n=30,采用VMAT技术)和对照组(n=30,采取IMRT技术).对两组患者靶区剂量分布、危及器官剂量分布、体内受照剂量分布及加速器输出机器跳数与治疗时间进行统计学比较.结果:VMAT与IMRT两种技术均符合靶区处方要求,为确保比较的可操作性,将计划靶区95%剂量统一为5000cGy.与对照组比较,研究组患者V100、D98%靶区剂量分布较高,Dmean与CI值较高,D2%、Dmax、HI值较低,差异均有统计学意义(P<0.05);两组患者V106、D95%比较,差异无统计学意义(P>0.05).与对照组比较,研究组患者健侧乳腺Dlcc、Dmax、Dmean较低,健侧肺V5、Dmax较低,患侧肺V20、V30、Dmax、Dmean较低,心脏V5、V20、V30、Dmean较低,肝V5、V50、Dmax较低,脊髓Dlcc、Dmean值较低,差异均有统计学意义(P<0.05);其余指标比较,差异均无统计学意义(P>0.05).与对照组比较,研究组患者V5、V10、V20、V30参数较低,差异均有统计学意义(P<0.05),两组患者V40、V50参数比较,差异均无统计学意义(P>0.05).与对照组比较,研究组患者平均机器跳数较少,平均治疗时间缩短,差异均有统计学意义(P<0.05).结论:对乳腺癌根治术后患者采取VMAT技术,较采取IMRT,更有利于确保靶区剂量分布均匀与适形度,减少体内受照与危及器官剂量,加速器输出机器跳数更少,治疗时间更短.

关键词：乳腺癌根治术固定野调强放疗容积弧形动态旋转调强剂量学分布

来源：评论

学校读者我要写书评

暂无评论

High-performance carbon-electrode-based self-powered optoelectronic synaptic devices

引用

Science China(Information Sciences) 2024年第5期67卷 339-340页

作者： Wen HUANG xuwen XIA Huixing zhang Tenglong GUO Pengjie HANG Bin LI Jiawei TANG Biao LI Chen ZHU Lei WANG Deren YANG Xuegong YU Xing'ao LI Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science Nanjing University of Posts and Telecommunications College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University

A two-terminal self-powered optoelectronic structure could mimic synaptic functions of a human brain synapse unit(Figure 1(a)) based on the photovoltaic effects [1], demonstrating the potential for decreasing energy consumption for future computing. However, current self-powered optoelectronic synaptic devices face issues of stability and cost,which mainly arise from noble metal electrodes and independent hole transport layers used in these structures. Substituting low-cost carbon for these metal electrodes and carrier transport layers may promise to solve these challenges.

关键词： electrode devices carbon high based optoelectronic performance self-powered synaptic

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：