检索结果-南通市图书馆

Natural convection of SiO_2-water nanofluid in square cavity with thermal square column

Applied Mathematics and Mechanics(English Edition) 2017年第4期38卷 585-602页

作者： xiaopeng xiong Sheng CHEN Bo YANG State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Institute for Modelling and Simulation in Fluodynamics Nanoscience and Industrial Mathematics "Gregorio Millan Barbany"Universidad Carlos III de Madrid Faculty of Engineering The University of NottinghamUniversity Park

A square with a thermal square column is a simple but nontrivial research prototype for nanofluid research. However, until now, the effects of the temperature of the square column on the heat and mass transfer of nanofluids have not been revealed comprehensively, especially on entropy generation. To deepen insight into this important field, the natural convection of the SiO2-water nanofluid in a square cavity with a square thermal column is studied numerically in this study. The effects of the thermal column temperature （T = 0.0, 0.5, 1.0, 1.5）, the Rayleigh number （ranging from 103 to 106）, and the volume fraction of the nanoparticle （varying from 0.01 to 0.04） on the fluid flow, heat transfer, and entropy generation are investigated, respectively. It is found that, no matter at a low or high Rayleigh number, the volume fraction of the nanoparticle shows no considerable effects on the flow field and temperature field for all the temperatures of the thermal column. With an increase in the volume fraction, the mean Nusselt number increases slightly. At the same time, it is found that, with an increase in the temperature of the thermal column, the average Nusselt number gradually decreases at all values of the Rayleigh number. Meanwhile, it is found that, at a high Rayleigh number, the heat transfer mechanism is the main parameter affecting the increase in the total entropy generation rather than the volume fraction. In addition, no matter at a high or low Rayleigh number, when T = 0.5, the total entropy generation is the minimum.

关键词： natural convection SiO2-water nanofluid Rayleigh number volume fraction entropy generation

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

Reinforcement of Self-Healing Polyacrylic Acid Hydrogel with Acrylamide Modified Microcrystalline Cellulose

引用

Chinese Journal of Chemistry 2020年第5期38卷 494-500页

作者： Changzhuang Bai Qiuhua Huang xiaopeng xiong Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamenFujian 361005China

Self-healing hydrogel such as polyacrylic acid(PAA)hydrogel has attracted increasing attention based on its promising potential ***,it usually suffers from low strength especially as mechanical ***,a commercial microcrystalline cellulose(MCC)was modified with acrylamide to graft polyacrylamide(PAM)chains on the particle *** acrylamide-modified MCC(AM-MCC)was then dispersed in monomer solution of acrylic acid to prepare composite *** mechanical properties of the obtained composite hydrogels and the self-healed hydrogels were carefully measured by compressive and tensile tests,and by dynamic mechanical *** results demonstrate that introduction of a small amount of AM-MCC such as 3 wt%can not only reinforce the original hydrogel and the healed hydrogel markedly,but also improve self-healing efficiency *** analyses indicate that in addition to the reversible multi-interactions such as hydrogen bonding and ionic interactions,the entanglements between the PAA chains of the hydrogel matrix and the PAM chains grafted on the MCC particles have also played an important role on the improvement in mechanical performances and the healing ability of the ***,the responsiveness to exterior ion has been tested to indicate potential application of the composite hydrogel as self-healable sensor.

关键词： surface. chains acrylic

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

Carbonation of Pure Minerals in Portland Cement:Evolution in Products as a Function of Water-to-solid Ratio

引用

Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1214-1222页

作者： xiong Kun SHANG xiaopeng LI Hongyan WANG Dan Zhengzhou Lutong Highway Construction Co. Ltd.Zhengzhou 450052China (Special Glass Key Lab of Hainan Province)&(State Key Laboratory of Marine Resource Utilization in South China Sea) Hainan UniversityHaikou 570228China Department of Architectural Engineering Shandong Urban Construction Vocational CollegeJinan 250103China (State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Sobute New Materials Co.Ltd.)&(School of Material Science and EngineeringSoutheast UniversityNanjing 211189China)

Minerals in Portland cement including tricalcium silicate(C_(3)S),β-dicalcium silicate(β-C_(2)S),tricalcium aluminate(C_(3)A),and tetracalcium ferroaluminate(C_(4)AF),show a significantly different activity and product evolution for CO_(2)curing at various water-to-solid *** pure minerals were synthesized and subject to CO_(2)curing in this study to make an in-depth understanding for the carbonation properties of cement-based *** showed that the optimum water-to-solid ratios of C_(3)S,β-C_(2)S,C_(3)A and C_(4)AF were 0.25,0.15,0.30 and 0.40 for carbonation,corresponding to 2 h carbonation degree of 38.5%,38.5%,24.2%,and 21.9%,*** produced calcite duringβ-C_(2)S carbonation decreased as the water-to-solid ratio increased,with an increase in content of metastable CaCO_(3)of vaterite and *** thermodynamic stability of CaCO_(3)produced during carbonation was C_(3)A>C_(4)AF>β-C_(2)S>C_(3)*** carbonation degree of Portland cement was predicted based on the results of pure minerals and the composition of cement,and the error of predicted production of CaCO_(3)was only 1.1%,which provides a potential method to predict carbonation properties of systems with a complex mineral composition.

关键词： accelerated carbonation portland cement calcium carbonate water-to-solid ratio

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

SBS嵌段共聚物分子结构对其在溶液中链形态的影响

引用

高分子学报 2011年第1期21卷 76-80页

作者：熊晓鹏厦门大学材料学院材料科学与工程系厦门361005

线形两嵌段(SB)苯乙烯-丁二烯嵌段共聚物、线形三嵌段[(SB)2]和星形四臂三嵌段[(SB)4]的苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物溶于四氢呋喃(THF)和环己烷(CH)中,通过黏度法获得它们的特性黏数并计算其黏度半径(Rη);采用静态激光光散射... 详细信息

线形两嵌段(SB)苯乙烯-丁二烯嵌段共聚物、线形三嵌段[(SB)2]和星形四臂三嵌段[(SB)4]的苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物溶于四氢呋喃(THF)和环己烷(CH)中,通过黏度法获得它们的特性黏数并计算其黏度半径(Rη);采用静态激光光散射法研究了它们在溶液中的第二维利系数和均方根旋转半径(Rg).由于Rη与其流体力学半径(Rh)具有相似性,所以表征链形态的特征参数ρ(=Rg/Rh)可通过上述两种方法获得.结果表明,(SB)4分子在良溶剂THF中表现出柔顺链构象,在CH中表现为实心球构象;(SB)2在THF和CH中均为空心球构象;两嵌段SB在THF和CH中均为柔顺链构象.

关键词：嵌段共聚物分子结构黏度法激光光散射链形态

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

Solution viscosity of charged and of uncharged polymers: Effects of extra salt and of solute concentration

Solution viscosity of charged and of uncharged polymers: Eff...

引用

2015年全国高分子学术论文报告会

作者： Bernhard A.Wolf xiaopeng xiong Institut für Physikalische Chemie der Johannes Gutenberg-Universit?t Mainz Department of Materials Science and Engineering College of Materials Xiamen University

The flow behavior of polymer solutions is by and large well understood. There are, however, two areas in which our knowledge is still poor. One(i) concerns the behavior of polyelectrolyte solutions in the absence of extra salt. Another field of deficiency(ii) lies in a consistent description of the influences of polymer concentration form infinite dilution to the pure melt. The present lecture deals with these two subjects. Ad(i): This part[1, 2] describes the effects of the salinity of the solvent on the flow behavior in terms of viscosities and of intrinsic viscosities [ ]. Particular attention is being paid to the valency of the counterion of extra salt and on the establishment of predictive master curves. Ad(ii): This part[3] presents a thermodynamically inspired approach. Instead of polymer concentrations c(mass per volume) it uses the dimensionless reduced polymer concentration c [ ]= c. The following relation ln η=c/(1+pc+qc), in which rel stands for the relative viscosity as compared with that of the pure solvent, is capable of describing the behavior in the entire compositon range by means of the two paremters p and q. A better description of the phenomena addressed above should help an improved understanding of the performance of complex systems, like the biologically important joint solutions of chain molecules and proteins in saline solvents.

关键词： polyelectrolyte solutions intrinsic viscosities extra salt composition dependent viscosities

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Intensity modulated radiation therapy in elderly patients with nasopharyngeal carcinoma

引用

Holistic Integrative Oncology 2023年第1期2卷 182-188页

作者： Tianzhu Lu xiaopeng xiong Fangyan Zhong Xiaochang Gong Jingao Li Department of Radiation Oncology Jiangxi Cancer Hospital519 East Beijing RoadNanchang 330029People’s Republic of China NHC Key Laboratory of Personalized Diagnosis and Treatment of Nasopharyngeal Carcinoma Jiangxi Cancer Hospital of Nanchang University519 East Beijing RoadNanchang 330029People’s Republic of China

Purpose To evaluate the outcomes in elderly patients with nasopharyngeal carcinoma(NPC)treated by intensity modulated radiation therapy(IMRT).Methods Patients with NPC aged≥70 years old who received intensity-modulated radiation therapy≥60 Gy were recruited into this *** overall survival(OS),progression-free survival(PFS),cancer-specific survival(CSS),locoregional recurrence-free rate(LRFR)and distant metastasis-free rate(DMFR)were calculated using the Kaplan–Meier *** Cox proportional hazards model was applied to perform multivariate analysis for independent prognosticators using meaningful variables from the univariate *** One hundred ninety seven patients with NPC≥70 years were recruited from the 4351 newly diagnosed NPC patients from January 2011 to December *** 5-year OS,CSS,PFS,LRFR and DMFR were 59.6%,78.9%,51.3%,91.6%and 78.9%,*** plasma EBV DNA was the only prognostic factor for OS,the overall staging was the only prognostic factor for CSS,and plasma EBV DNA and N category were borderline significant factor for *** did not find any prognosticator for PFS and *** The survival after IMRT for elderly patients with NPC is *** study stratified by comorbidity and geriatric assessment is needed.

关键词： Nasopharyngal carcinoma Intensity-modulated radiation therapy Chemotherapy Elderly patients

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

新型装配式金属消能减震复合墙板抗震性能试验研究

引用

振动与冲击 2020年第9期39卷 159-164页

作者：吴从晓熊晓鹏徐虎吴从永广州大学土木工程学院广州510006 广东技术师范大学天河学院广州510540

为了研究新型预制装配式金属消能减震复合墙板的抗震性能,分别对新型预制装配式复合墙板以及传统夹心墙板进行了低周反复加载试验,对比研究了试件的破坏模式、滞回耗能性能、承载力与刚度、位移延性等变化。研究表明:新型预制金属消能... 详细信息

为了研究新型预制装配式金属消能减震复合墙板的抗震性能,分别对新型预制装配式复合墙板以及传统夹心墙板进行了低周反复加载试验,对比研究了试件的破坏模式、滞回耗能性能、承载力与刚度、位移延性等变化。研究表明:新型预制金属消能减震复合墙板滞回曲线呈现"平行四边形",相对于传统复合墙板较为饱满,具有良好的抗震性能;相比于传统夹心复合墙板主要在墙板中部出现X形剪切裂缝,新型预制装配式金属消能复合墙板裂缝主要在墙板角部出现,具有良好的整体性能;新型预制装配式金属消能减震复合墙板具有较小的侧向刚度、较好的位移延性,能够降低围护墙板附加刚度约束效应;新型预制装配式金属消能减震墙板能够达到"小震下处于弹性,大震下屈服耗能"抗震设计目标。

关键词：装配式复合墙板抗震性能低周期反复加载

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

1147例肝移植单中心经验

引用

中华普通外科杂志 2024年第5期39卷 333-338页

作者：熊骁鹏徐庆国苗小龙王昊刘鹏李新强周鑫王新王峰张勇孙延东蔡金贞吴力群许传屾王建红郭庆军青岛大学附属医院器官移植中心青岛266000

目的:分析青岛大学附属医院行肝移植手术的1 147例患者的预后情况,总结提高肝移植疗效的措施。方法:回顾性分析青岛大学附属医院1 147例肝移植患者的临床及随访资料。结果:1 147例肝移植患者术后1、3、5年总体生存率分别为87.20%、73.40... 详细信息

目的:分析青岛大学附属医院行肝移植手术的1 147例患者的预后情况,总结提高肝移植疗效的措施。方法:回顾性分析青岛大学附属医院1 147例肝移植患者的临床及随访资料。结果:1 147例肝移植患者术后1、3、5年总体生存率分别为87.20%、73.40%、65.60%。良性疾病肝移植受者组术后1、3、5年生存率分别为88.01%、84.98%、81.39%。恶性疾病肝移植受者组术后1、3、5年生存率分别为78.11%、64.41%、60.06%。良性疾病肝移植受者组生存率显著优于恶性疾病肝移植受者组( P<0.001)。中后期手术组患者术后1、3年的生存率分别为84.20%、70.80%;90.50%、71.70%,后期的生存率要优于中期( P=0.022)。复杂手术组患者术后1、3、5年的存活率分别为82.70%、65.50%、56.70%;普通手术组患者术后1、3、5年的存活率分别为89.00%、76.50%、69.20%。普通手术组生存率显著优于复杂手术组( P<0.001)。良性疾病受者死亡原因主要为多器官功能衰竭(4.1%),恶性疾病受者死亡原因主要为恶性肿瘤复发(23.7%)。术后原发性移植物无功能、移植肝功能延迟恢复、门静脉栓塞、肝动脉栓塞、胆管狭窄、移植后淋巴组织增生性疾病、移植物抗宿主病发生率分别为1.05%、6.89%、1.92%、0.44%、2.00%、0.61%、0.44%。结论:本中心随着手术技术及围手术期处理水平日益提高,受者近3年生存率有所升高。恶性疾病及复杂肝移植是影响受者预后的重要因素。

关键词：肝移植预后术后并发症

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

最小驻留价值缓存替换算法

引用

计算机应用 2013年第4期33卷 1018-1022页

作者：刘磊熊小鹏重庆邮电大学计算机科学与技术学院重庆400065 重庆新媒农信科技有限公司重庆401121

为提高搜索应用的缓存性能,提出一种新的缓存替换算法——最小驻留价值(LCV)算法。该算法通过计算对象访问频率,结合对象大小,优先选取对字节命中率贡献最小的对象集进行缓存替换。同时,将最优替换对象集的选取转化为经典0-1背包问题进... 详细信息

为提高搜索应用的缓存性能,提出一种新的缓存替换算法——最小驻留价值(LCV)算法。该算法通过计算对象访问频率,结合对象大小,优先选取对字节命中率贡献最小的对象集进行缓存替换。同时,将最优替换对象集的选取转化为经典0-1背包问题进行了求解,并给出一种快速近似解法及其算法数据结构。在与最近最少使用(LRU)、先进先出(FIFO)和考虑多重因子(GD-Size)算法的对比实验中,LCV算法在提高字节命中率(BHR)和降低平均延时时间(ALT)方面具有更好的性能。

关键词：缓存替换驻留价值 0-1背包问题字节命中率延迟时间

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

黏度法研究牛血清白蛋白的构象

引用

厦门大学学报（自然科学版） 2017年第3期56卷 456-460页

作者：廖芸英熊晓鹏厦门大学材料学院福建厦门361005

采用乌氏黏度计测定不同pH条件下牛血清白蛋白(BSA)的黏度,运用Wolf方程描述BSA的黏度变化行为.详细讨论了不同pH条件下BSA的特性黏数(intrinsic viscosity,[η])与其构象的关系,并分析了BSA比特性黏数(specific intrinsic viscosity,{... 详细信息

采用乌氏黏度计测定不同pH条件下牛血清白蛋白(BSA)的黏度,运用Wolf方程描述BSA的黏度变化行为.详细讨论了不同pH条件下BSA的特性黏数(intrinsic viscosity,[η])与其构象的关系,并分析了BSA比特性黏数(specific intrinsic viscosity,{η})的组成变化.研究结果表明,采用这种新型的黏度法研究球状蛋白质的构象或溶液性质是科学、可行的.

关键词：黏度法特性黏数牛血清白蛋白构象

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：