检索结果-南通市图书馆

Lagrangian-based investigation of multiphase flows by finite-timeLyapunov exponents

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第3期28卷 612-624页

作者： Jia-Ning Tang chien-chou tseng Ning-FeiWang School of Aerospace Engineering Beijing Institute of Technology100081 Beijing China Department of Mechanical and Electro-Mechanical Engineering National Taiwan Sun Yat-Sen UniversityKaohsiung Taiwan China Department of Aerospace Engineering University of Michigan Ann ArborM148109 USA

Multiphase flows are ubiquitous in our daily life and engineering applications. It is important to investigate the flow structures to predict their dynamical behaviors ef- fectively. Lagrangian coherent structures （LCS） defined by the ridges of the finite-time Lyapunov exponent （FTLE） is utilized in this study to elucidate the multiphase interactions in gaseous jets injected into water and time-dependent turbu- lent cavitation under the framework of Navier-Stokes flow computations. For the gaseous jets injected into water, the highlighted phenomena of the jet transportation can be observed by the LCS method, including expansion, bulge, necking/breaking, and back-attack. Besides, the observation of the LCS reveals that the back-attack phenomenon arises from the fact that the injected gas has difficulties to move toward downstream re- gion after the necking/breaking. For the turbulent cavitating flow, the ridge of the FTLE field can form a LCS to capture the front and boundary of the re-entraint jet when the ad- verse pressure gradient is strong enough. It represents a bar- rier between particles trapped inside the circulation region and those moving downstream. The results indicate that the FFLE field has the potential to identify the structures of mul- tiphase flows, and the LCS can capture the interface/barrier or the vortex/circulation region.

关键词： Finite-time Lyapunov exponents Lagrangiancoherent structures Multiphase flow Gaseous jets injectedinto water Cavitation

Modeling of turbulent,isothermal and cryogenic cavitation under attached conditions

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2010年第3期26卷 325-353页

作者： chien-chou tseng Yingjie Wei GuoyuWang Wei Shyy Department of Mechanical Engineering University of Michigan2350 Hayward Ann Arbor MI 48109 USA School of Astronautics Harbin Institute of Technology 92 West Da-Zhi Street Harbin 150001 China School of Vehicle and Transportation Engineering Beijing Institute of Technology 5 South Zhongguancun Street Beijing 100081 China Department of Aerospace Engineering University of Michigan 1320 Beal Ann Arbor MI 48109 USA

Cavitation is often triggered when the fluid pres- sure is lower than the vapor pressure at a local thermo- dynamic state. The present article reviews recent progress made toward developing modeling and computational strat- egies for cavitation predictions under both isothermal and cryogenic conditions, with an emphasis on the attached cav- ity. The review considers alternative cavitation models along Reynolds-averaged Navier-Stokes and very lager eddy simu- lation turbulence approaches to ensure that the computational tools can handle flows of engineering interests. Observing the substantial uncertainties associated with both modeling and experimental information, surrogate modeling strategies are reviewed to assess the implications and relative impor- tance of the various modeling and materials parameters. The exchange between static and dynamic pressures under the influence of the viscous effects can have a noticeable impact on the effective shape of a solid object, which can impact the cavitation structure. The thermal effect with respect to evaporation and condensation dynamics is examined to shed light on the fluid physics associated with cryogenic cav- itation. The surrogate modeling techniques are highlighted in the context of modeling sensitivity assessment. Keywords

关键词： Cavitation Cryogenic liquidThermal effects Turbulence model - Surrogate model

Surrogate-based modeling and dimension reduction techniques for multi-scale mechanics problems

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2011年第6期27卷 845-865页

作者： Wei Shyy Young-Chang Cho Wenbo Du Amit Gupta chien-chou tseng Ann Marie Sastry Hong Kong University of Science and Technology Clear Water Bay Hong Kong China University of Michigan Ann Arbor MI USA National Taiwan Sun Yat-Sen University Kaohsiung Taiwan China

Successful modeling and/or design of engineering systems often requires one to address the impact of multiple ＂design variables＂ on the prescribed *** are often multiple,competing objectives based on which we assess the outcome of *** accurate,high fidelity models are typically time consuming and computationally expensive,comprehensive evaluations can be conducted only if an efficient framework is ***,informed decisions of the model/hardware＇s overall performance rely on an adequate understanding of the global,not local,sensitivity of the individual design variables on the *** surrogate-based approach,which involves approximating the objectives as continuous functions of design variables from limited data,offers a rational framework to reduce the number of important input variables,i.e.,the dimension of a design or modeling *** this paper,we review the fundamental issues that arise in surrogate-based analysis and optimization,highlighting concepts,methods,techniques,as well as modeling implications for mechanics *** aid the discussions of the issues involved,we summarize recent efforts in investigating cryogenic cavitating flows,active flow control based on dielectric barrier discharge concepts,and lithium（Li）-ion *** is also stressed that many multi-scale mechanics problems can naturally benefit from the surrogate approach for ＂scale bridging.＂

关键词： Multi-scale mechanics ~ Cryogenic cavitating flow Surrogate-based modeling Active flow control Engineering system

Time Parameter Based Low-Energy Data Encryption Method for Mobile Applications

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第9期140卷 2779-2794页

作者： Li-Woei Chen Kun-Lin Tsai Fang-Yie Leu Wen-Cheng Jiang Shih-Ting tseng Department of Computer and Information Sciences Chinese Military AcademyKaohsiung830TaiwanChina Department of Electrical Engineering Tunghai UniversityTaichung407TaiwanChina Department of Computer Science Tunghai UniversityTaichung407TaiwanChina

Various mobile devices and applications are now used in daily *** devices require high-speed data processing,low energy consumption,low communication latency,and secure data transmission,especially in 5G and 6G mobile ***-security cryptography guarantees that essential data can be transmitted securely;however,it increases energy consumption and reduces data processing ***,this study proposes a low-energy data encryption(LEDE)algorithm based on the Advanced Encryption Standard(AES)for improving data transmission security and reducing the energy consumption of encryption in Internet-of-Things(IoT)*** the proposed LEDE algorithm,the system time parameter is employed to create a dynamic S-Box to replace the static S-Box of *** indicated that six-round LEDE encryption achieves the same security level as 10-round conventional AES *** reduction in encryption time results in the LEDE algorithm having a 67.4%lower energy consumption and 43.9%shorter encryption time than conventional AES;thus,the proposed LEDE algorithm can improve the performance and the energy consumption of IoT edge devices.

关键词： Mobile application security AES data encryption time parameter mobile device

Biological scaffold as potential platforms for stem cells:Current development and applications in wound healing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2024年第4期16卷 334-352页

作者： Jie-Yu Xiang Lin Kang Zi-Ming Li Song-Lu tseng Li-Quan Wang Tian-Hao Li Zhu-Jun Li Jiu-Zuo Huang Nan-Ze Yu Xiao Long Department of Plastic and Reconstructive Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Biomedical Engineering Facility Institute of Clinical MedicinePeking Union Medical College HospitalChinese Academy of Medical SciencesBeijing 100021China

Wound repair is a complex challenge for both clinical practitioners and *** approaches for wound repair have several *** cell-based therapy has emerged as a novel strategy to address this issue,exhibiting significant potential for enhancing wound healing rates,improving wound quality,and promoting skin ***,the use of stem cells in skin regeneration presents several ***,stem cells and biomaterials have been identified as crucial components of the wound-healing *** therapy involving the development of biocompatible scaffolds,accompanying cells,multiple biological factors,and structures resembling the natural extracellular matrix(ECM)has gained considerable *** scaffolds encompass a range of biomaterials that serve as platforms for seeding stem cells,providing them with an environment conducive to growth,similar to that of the *** scaffolds facilitate the delivery and application of stem cells for tissue regeneration and wound *** article provides a comprehensive review of the current developments and applications of biological scaffolds for stem cells in wound healing,emphasizing their capacity to facilitate stem cell adhesion,proliferation,differentiation,and paracrine ***,we identify the pivotal characteristics of the scaffolds that contribute to enhanced cellular activity.

关键词： Stem-cell-based therapy Biological scaffolds Wound healing Extracellular matrix mimicry Cellular activities enhancement Scaffold characteristics

Estimation Performance for the Cubature Particle Filter under Nonlinear/Non-Gaussian Environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第5期67卷 1555-1575页

作者： Dah-Jing Jwo chien-Hao tseng Department of Communications Navigation and Control EngineeringTaiwan Ocean UniversityKeelung202301TaiwanChina National Center for High-Performance Computing National Applied Research LaboratoriesHsinchu30076TaiwanChina

This paper evaluates the state estimation performance for processing nonlinear/non-Gaussian systems using the cubature particle lter(CPF),which is an estimation algorithm that combines the cubature Kalman lter(CKF)and the particle lter(PF).The CPF is essentially a realization of PF where the third-degree cubature rule based on numerical integration method is adopted to approximate the proposal *** is benecial where the CKF is used to generate the importance density function in the PF framework for effectively resolving the nonlinear/non-Gaussian *** on the spherical-radial transformation to generate an even number of equally weighted cubature points,the CKF uses cubature points with the same weights through the spherical-radial integration rule and employs an analytical probability density function(pdf)to capture the mean and covariance of the posterior distribution using the total probability theorem and subsequently uses the measurement to update with Bayes’*** is capable of acquiring a maximum a posteriori probability estimate of the nonlinear system,and thus the importance density function can be used to approximate the true posterior density *** Bayesian ltering,the nonlinear lter performs well when all conditional densities are assumed *** applied to the nonlinear/non-Gaussian distribution systems,the CPF algorithm can remarkably improve the estimation accuracy as compared to the other particle lterbased approaches,such as the extended particle lter(EPF),and unscented particle lter(UPF),and also the Kalman lter(KF)-type approaches,such as the extended Kalman lter(EKF),unscented Kalman lter(UKF)and *** illustrative examples are presented showing that the CPF achieves better performance as compared to the other approaches.

关键词： Nonlinear estimation non-Gaussian Kalman lter unscented Kalman lter cubature particle filter

Refinement of circular-polarization based on multilayer film structure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 94-97页

作者： LEE Kuei-jen chou Hsi-tseng Key Laboratory of Optical Communications and Lightwave Technologies Beijing University of Posts and Telecommunications

Circular-polarization discrimination appears in many antennas＇ applications. A compensation approach based on multilayer film structure is proposed to improve the axial ratio of the magnitude of the two perpendicular modes of the lump ports. The goal is to widen the beamwidth of radiation that has an axial ratio less than 3 dB and thus reducing the complexity at the receiver. A transfer matrix method was developed to represent the multilayer film and characterize its performance. Simulation using high frequency structure simulator shows that a crossed dipole, as an example, can achieve a beamwidth of more than 30° at the frequency of 12.45 GHz after compensation. Finally, conclusions and future work about this compensation method are presented.

关键词： crossed dipole multilayer compensation beamwidth

Aldo-keto reductase family member C3(AKR1C3)promotes hepatocellular carcinoma cell growth by producing prostaglandin F2α

在线全文

学校读者我要写书评

暂无评论

Oncology Research 2024年第1期32卷 163-174页

作者： KUO-SHYANG JENG PO-YU CHENG YUEH-HSIEN LIN PO-CHUN LIU PING-HUI tseng YU-CHAO WANG CHIUNG-FANG CHANG CHUEN-MIIN LEU Division of General Surgery Far Eastern Memorial HospitalNew Taipei City22060Taiwan Institute of Microbiology and Immunology National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Institute of Biochemistry and Molecular Biology National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Institute of Biomedical Informatics National Yang Ming Chiao Tung UniversityTaipei City11221Taiwan Department of Medical Research Far Eastern Memorial HospitalNew Taipei City22060Taiwan

Hepatocellular carcinoma(HCC)is a leading cause of death *** therapies are effective for HCC patients with early disease,but many patients suffer recurrence after surgery and have a poor response to ***,new therapeutic targets are *** analyzed gene expression profiles between HCC tissues and normal adjacent tissues from public databases and found that the expression of genes involved in lipid metabolism was significantly *** analysis showed that AKR1C3 was upregulated in tumors,and high AKR1C3 expression was associated with a poorer prognosis in HCC *** vitro,assays demonstrated that the knockdown of AKR1C3 or the addition of the AKR1C3 inhibitor indomethacin suppressed the growth and colony formation of HCC cell *** of AKR1C3 in Huh7 cells reduced tumor growth in *** explore the mechanism,we performed pathway enrichment analysis,and the results linked the expression of AKR1C3 with prostaglandin F2 alpha(PGF2a)downstream target *** of AKR1C3 activity reduced the production of PGF2a,and supplementation with PGF2a restored the growth of indomethacin-treated Huh7 *** of the PGF receptor(PTGFR)and treatment with a PTGFR inhibitor significantly reduced HCC *** showed that indomethacin potentiated the sensitivity of Huh7 cells to *** summary,our results indicate that AKR1C3 upregulation may promote HCC growth by promoting the production of PGF2α,and suppression of PTGFR limited HCC ***,targeting the AKR1C3-PGF2a-PTGFR axis may be a new strategy for the treatment of HCC.

关键词： Hepatocellular carcinoma Aldo-keto reductase family member C3 Prostaglandin F2 alpha Prostaglandin F receptor

Adipose-derived stem cells in diabetic foot care:Bridging clinical trials and practical application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第6期15卷 1162-1177页

作者： Song-Lu tseng Lin Kang Zhu-Jun Li Li-Quan Wang Zi-Ming Li Tian-Hao Li Jie-Yu Xiang Jiu-Zuo Huang Nan-Ze Yu Xiao Long Department of Plastic and Reconstructive Surgery Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Plastic and Reconstructive Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Biomedical Engineering Facility Institute of Clinical MedicinePeking Union Medical College HospitalChinese Academy of Medical Sciences BeijingBeijing 100021China

Diabetic foot ulcers(DFUs)pose a critical medical challenge,significantly impairing the quality of life of ***-derived stem cells(ADSCs)have been identified as a promising therapeutic approach for improving wound healing in *** extensive exploration of the mechanical aspects of ADSC therapy against DFU,its clinical applications remain *** this review,we aimed to bridge this gap by evaluating the use and advancements of ADSCs in the clinical management of *** review begins with a discussion of the classification and clinical management of diabetic foot *** then discusses the current landscape of clinical trials,focusing on their geographic distribution,reported efficacy,safety profiles,treatment timing,administration techniques,and dosing ***,the review discusses the preclinical strategies to enhance ADSC *** review shows that many trials exhibit biases in study design,unclear inclusion criteria,and intervention *** conclusion,this review underscores the potential of ADSCs in DFU treatment and emphasizes the critical need for further research and refinement of therapeutic approaches,with a focus on improving the quality of future clinical trials to enhance treatment outcomes and advance the field of diabetic wound care.

关键词： Adipose-derived stem cells Diabetic foot ulcers Wound healing Clinical