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Galerkin-based quasi-smooth manifold element(QSME)method for anisotropic heat conduction problems in composites with complex geometry

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 137-154页

作者： Pan wang Xiangcheng HAN Weibin WEN baolin wang Jun LIANG School of Civil Engineering Central South UniversityChangsha 410083China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China School of Science Harbin Institute of TechnologyShenzhen 518055Guangdong ProvinceChina

The accurate and efficient analysis of anisotropic heat conduction problems in complex composites is crucial for structural design and performance evaluation. Traditional numerical methods, such as the finite element method(FEM), often face a trade-off between calculation accuracy and efficiency. In this paper, we propose a quasi-smooth manifold element(QSME) method to address this challenge, and provide the accurate and efficient analysis of two-dimensional(2D) anisotropic heat conduction problems in composites with complex geometry. The QSME approach achieves high calculation precision by a high-order local approximation that ensures the first-order derivative continuity.The results demonstrate that the QSME method is robust and stable, offering both high accuracy and efficiency in the heat conduction analysis. With the same degrees of freedom(DOFs), the QSME method can achieve at least an order of magnitude higher calculation accuracy than the traditional FEM. Additionally, under the same level of calculation error, the QSME method requires 10 times fewer DOFs than the traditional FEM. The versatility of the proposed QSME method extends beyond anisotropic heat conduction problems in complex composites. The proposed QSME method can also be applied to other problems, including fluid flows, mechanical analyses, and other multi-field coupled problems, providing accurate and efficient numerical simulations.

关键词： anisotropic heat conduction quasi-smooth manifold element(QSME) composite with complex geometry numerical simulation finite element method(FEM)

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Anti-plane pull-out of a rigid line inclusion from an elastic medium

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 809-822页

作者： Yansong wang baolin wang Youjiang CUI Kaifa wang Harbin Institute of Technology Shenzhen Campus Harbin Institute of TechnologyHarbin 150001China

The transient and static anti-plane problem of a rigid line inclusion pulled out from an elastic medium is studied.The singular integral equation method is used to solve the stress field.Under the static load,the stress intensity factor(SIF)at the inclusion tips increases with the medium length.The problem becomes equivalent to an inclusion in a medium with an infinite length when the length of the medium is 3.5times longer than that of the inclusion.However,under the transient load,the maximum value of the SIF occurs when the medium length is about two times the inclusion length.Besides,the relation between the pull-out force and the anti-plane displacement is given.The conclusions are useful in guiding the design of fiber reinforced composite materials.

关键词： pull-out rigid line inclusion anti-plane stress intensity factor(SIF) stress singularity

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Biodegradation of pyrene by Phanerochaete chrysosporium and enzyme activities in soils:Effect of SOM,sterilization and aging

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Journal of Environmental Sciences 2014年第5期26卷 1135-1144页

作者： Cuiping wang Hongwen Sun Haibin Liu baolin wang MOE Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and Engineering Nankai University

The impacts of soil organic matter （SOM）, aging and sterilization on the production of lignin peroxidase （LIP） and manganese peroxidase （MnP） by Phanerochaete chrysosporium during the biodegradation of pyrene in soils were investigated. The biodegradation of pyrene by P. chrysosporium decreased with increasing SOM content, whereas the maximum activities of LiP and MnP increased, which indicates that SOM outweighed pyrene in controlling enzyme production. Sterilization enhanced the degradation of pyrene due to the elimination of competition from indigenous microbes, whereas aging led to a reduction in the degradation of pyrene primarily through changes in its sorbed forms. Both sterilization and aging could reduce SOM content and alter its structure, which also influenced the bioavailability of pyrene and the enzyme activity. The sterilization and aging processes caused changes in the degradation of pyrene, and the enzyme activities were greater in soils with high SOM contents. MnP was related to the degradation of pyrene to a greater extent, whereas LiP was more related to the decomposition of SOM.

关键词： biodegradation Phanerochaete chrysosporium enzyme activities soil organic matter sterilization aging

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Mechanical properties of thermoelectric generators

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Journal of Materials Science & Technology 2023年第17期148卷 64-74页

作者： Xin Bao Shuaihang Hou Zhixin Wu Xiaodong wang Li Yin Yijie Liu Huolun He Sichen Duan baolin wang Jun Mao Feng Cao Qian Zhang School of Materials Science and Engineering and Institute of Materials Genome&Big DataHarbin Institute of TechnologyShenzhen518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China School of Science Harbin Institute of TechnologyShenzhen518055China

To satisfy the requirements of practical applications,thermoelectric generators should be highly efficient and mechanically robust.Recently,progress in designing high-performance thermoelectric generators has been made.However,the mechanical properties of thermoelectric generators are still unsatisfactory.In this review,studies on the mechanical properties of thermoelectric generators are summarized.The me-chanical properties of bulk thermoelectric generators will be first discussed.In this section,the mechan-ical properties of thermoelectric materials and the strategies for improving their mechanical properties are emphasized.Since the device’s failure usually occurs at the interface between the thermoelectric ma-terials and electrode,the joint strength of electrodes and thermoelectric materials will be overviewed.After that,the mechanical properties of the inorganic thin-film thermoelectric devices will be discussed.Since the figure of merit for the flexibility of thermoelectric materials depends on the film thickness,elastic modulus,and yield strength,the synthesis methods of thin-film thermoelectric materials will be reviewed.Finally,this review will be concluded with a discussion on flexible organic thermoelectric de-vices and flexible devices using bulk legs.

关键词： Thermoelectric generator Mechanical properties Interface Joint strength

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Vibration analysis of piezoelectric sandwich nanobeam with flexoelectricity based on nonlocal strain gradient theory

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Applied Mathematics and Mechanics(English Edition) 2020年第6期41卷 859-880页

作者： Shan ZENG Kaifa wang baolin wang Jinwu WU Jiangxi Key Laboratory of Micro Aeroengine School of Aircraft EngineeringNanchang Hangkong UniversityNanchang 330063China Graduate School at Shenzhen Harbin Institute of TechnologyHarbin 150001China School of Engineering Western Sydney UniversityPenrithNSW 2751Australia

A nonlocal strain gradient theory(NSGT) accounts for not only the nongradient nonlocal elastic stress but also the nonlocality of higher-order strain gradients,which makes it benefit from both hardening and softening effects in small-scale structures.In this study, based on the NSGT, an analytical model for the vibration behavior of a piezoelectric sandwich nanobeam is developed with consideration of flexoelectricity. The sandwich nanobeam consists of two piezoelectric sheets and a non-piezoelectric core. The governing equation of vibration of the sandwich beam is obtained by the Hamiltonian principle. The natural vibration frequency of the nanobeam is calculated for the simply supported(SS) boundary, the clamped-clamped(CC) boundary, the clamped-free(CF)boundary, and the clamped-simply supported(CS) boundary. The effects of geometric dimensions, length scale parameters, nonlocal parameters, piezoelectric constants, as well as the flexoelectric constants are discussed. The results demonstrate that both the flexoelectric and piezoelectric constants enhance the vibration frequency of the nanobeam.The nonlocal stress decreases the natural vibration frequency, while the strain gradient increases the natural vibration frequency. The natural vibration frequency based on the NSGT can be increased or decreased, depending on the value of the nonlocal parameter to length scale parameter ratio.

关键词： piezoelectric nanobeam sandwich structure flexoelectric nonlocal strain gradient theory(NSGT)

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The potential of carcinoembryonic antigen,p53,Ki-67 and glutathion Stransferase-π as clinico-histopathological markers for colorectal cancer

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The Journal of Biomedical Research 2010年第1期24卷 51-57页

作者： Zhenyu He Chuanbing Shi Hao Wen Fanglong Li baolin wang Jie wang Departments of General Surgery and the Second Affiliated Hospital to Nanjing Medical University Nanjing Jiangsu 210011 China. Department of Pathology the Second Affiliated Hospital to Nanjing Medical University Nanjing Jiangsu 210011 China. Interventional Radiology the First Affiliated Hospital Nanjing Medical University Nanjing Jiangsu 210011 China The First Clinic College Nanjing Medical University Nanjing Jiangsu 210029 China

Objective： Colorectal cancer is one of the major contributors to cancer death worldwide. Lack of reliable colorectal cancer markers has hampered the management of these cancer patients. Our main purpose was to study the correlation between histopathological variables of colorectal adenocarcinomas and identify histopathological markers that are of prognostic value in patients with colorectal cancer. Methods： In the present study, we examined the expression of carcinoembryonic antigen （CEA）, p53, Ki-67 and glutathion Stransferase （GST） -n by using immunohistochemical staining methods in 126 colorectal carcinoma patients and evaluated the lymph node metastasis status in these patients by histopathological examination. Results： The positive rates of CEA, p53, Ki-67 and GST-π expression in the colorectal cancer tissue specimens examined were 95.23%, 55.56%, 53.38% and 82.30%, respectively. Expression of p53 and Ki-67 was significantly correlated with the Dukes stages of the tumor, with higher levels of these proteins in Dukes＇ C and D tumors than those in Dukes＇ A and B tumors. Furthermore, the expression of p53, GST-π and Ki-67 correlated with prognosis of patients with colorectal cancer. Additionally, the expression of p53 in colorectal cancer was closely related to the expression of Ki-67 and the expression of GST-π was directly correlated with that of p53. Conclusion： The expression of CEA, p53, Ki-67 and GST-π was correlated with various clinical features of patients with colorectal cancer. The combined use of these histopathological markers appeared to be a promising tool in predicting the prognosis of patients with this type of cancer.

关键词： colorectal cancer carcinoembryonic antigen p53 Ki-67 glutathion stransferase-π lymph nodemetastasis

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Laparoscopic abdomino-perineal resection for patients with anorectal malignant melanoma:a report of 4 cases

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The Journal of Biomedical Research 2016年第5期30卷 436-440页

作者： Jun Han Chuanbing Shi Xiaogang Dong Jie wang Hao Wen baolin wang Zhenyu He Department of General Surgery the Second Affiliated HospitalNanjing Medical University Department of Pathology the Second Affiliated HospitalNanjing Medical University

Anorectal malignant melanoma is a very rare but lethal disease. Patients with anorectal malignant melanoma commonly complain for changes in bowel habits and rectal bleeding. Therefore, anorectal malignant melanoma is often misdiagnosed as hemorrhoids, polyp or rectal cancer. Surgery is the mainstay of treatment for patients with anorectal malignant melanoma. However, whether abdominoperineal resection or wide local excision is the most appropriate surgical approach is still a controversial issue. Recently, with the great development of laparoscopic techniques, more and more operations can be performed by laparoscopic techniques. However, laparoscopic abdominoperineal resection for management of anorectal malignant melanoma has been rarely reported. In this study, we reported 4 patients with anorectal malignant melanoma underwent laparoscopic abdominoperineal resection. The outcomes of these patients were relatively good during a long time follow-up. Meanwhile, we reviewed the relevant studies with particular focus surgical treatment.

关键词： anorectal malignant melanoma laparoscopic abdominoperineal resection wide local excision

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Treatment of severe acute pancreatitis through retroperitoneal laparoscopic drainage

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Frontiers of Medicine 2011年第3期5卷 302-305页

作者： Chun Tang baolin wang Bing Xie Hongming Liu Ping Chen Department of Hepatobiliary Surgery Research Institute of SurgeryDaping HospitalThird Military Medical UniversityChongqing 400042China

A treatment method based on drainage via retroperitoneal laparoscopy was adopted for 15 severe acute pancreatitis(SAP)patients to investigate the feasibility of the method.Ten patients received only drainage via retroperitoneal laparoscopy,four patients received drainage via both retroperitoneal and preperitoneal laparoscopy,and one patient received drainage via conversion to laparotomy.Thirteen patients exhibited a good drainage effect and were successfully cured without any other surgical treatment.Two patients had encapsulated effusions or pancreatic pseudocysts after surgery,but were successfully cured after lavage and B ultrasound-guided percutaneous catheter drainage.SAP treatment via retroperitoneal laparoscopic drainage is an effective surgical method,resulting in minor injury.

关键词： severe acute pancreatitis(SAP) laparoscope retroperitoneal drainage treatment

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海洋盐度对水下航行器热尾流行为的影响

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哈尔滨工程大学学报 2024年第1期45卷 182-188页

作者：吴霆锋杜永成杨立王保霖张泽华海军工程大学动力工程学院湖北武汉430033

针对海洋中的盐度环境对于水下航行器热尾流浮升扩散的影响,本文基于重叠网格技术,建立了水下航行器热尾流三维模型,分别对热尾流在均匀盐度与分层盐度环境下的浮升扩散过程进行了数值模拟,采用浮频率数表征盐度环境特征,研究了海洋盐... 详细信息

针对海洋中的盐度环境对于水下航行器热尾流浮升扩散的影响,本文基于重叠网格技术,建立了水下航行器热尾流三维模型,分别对热尾流在均匀盐度与分层盐度环境下的浮升扩散过程进行了数值模拟,采用浮频率数表征盐度环境特征,研究了海洋盐度对于热尾流的影响。结果表明:盐度分层环境对潜艇冷却水浮升具有明显抑制作用,该环境下海面温度特征随盐度梯度的增大而减弱。

关键词：热尾流海洋盐度重叠网格技术温度场浮升扩散水下航行器

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基于橇载喷管背压控制的引射装置设计与研究

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兵器装备工程学报 2024年第2期45卷 128-134页

作者：张晨辉谢波涛王宝林杨洋中国兵器工业试验测试研究院陕西华阴714200

为解决火箭橇试验橇载喷管背压过高的问题,验证引射装置设计的可行性,建立了二维引射性能预估模型,利用Fluent软件,并采用k-ε湍流模型,研究引射装置及其关键设计参数对喷管内部流场的影响,揭示了试验装置内外流场掺混机理。数值分析结... 详细信息

为解决火箭橇试验橇载喷管背压过高的问题,验证引射装置设计的可行性,建立了二维引射性能预估模型,利用Fluent软件,并采用k-ε湍流模型,研究引射装置及其关键设计参数对喷管内部流场的影响,揭示了试验装置内外流场掺混机理。数值分析结果表明:引射装置适用于大扩张比、低Ma数试验工况;引射装置总压、引射流量越大,引射效应越明显,引射装置与喷管尾端的距离、引射角度大小与引射效率呈负相关,设计中应保证引射装置燃气/空气流量比为0.75以上,引射位置在中部和后部时激波前的试验面积分别增加了0.42、0.75 m2;引射装置的加入使得试验段平均马赫数由2.6提升至3.3,均匀度提高约72%。

关键词：火箭橇喷管引射装置扩张比

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