检索结果-南通市图书馆

Unsteady one-dimensional analytical solutions for bioheat transfer equations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 1998年第6期 94-100页

作者：蔡睿贤张娜 Beijing 100080 China Chinese Academy of Sciences Institute of Engineering Thermophysics

Reasonable explicit analytical solutions are derived for the widely used three types of bioheat transfer equations i. e. Pennes equation, Wang equation and Chen-Holmes equation, as well as their revised forms considering heat wave effect. So far there have been no reports of so comprehensive analytical solutions published in literature. Besides its irreplaceable theoretical value, the analytical solution can also serve as a standard solution to check the recently rapid developing numerical calculation, and therefore promote the development of numerical method of computational heat transfer. In addition, some mathematical skills have originality and deserve further attention.

关键词： bioheat transfer unsteady analytical solution.

Accurate analysis of limiting human dose of non-lethal laser weapons

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第4期18卷 678-688页

作者： Chen-yang Lyu Ren-jun Zhan College of Equipment Management and Support Chinese People’s Armed Police Force Engineering UniversityXi’an710086ShaanxiChina

In order to maximize the lethality and reversibility of the non-lethal laser weapons(NLLW) at the same time and thus provide a theoretical basis for the R&D of laser weapons in the future,this paper accurately analyzed the limiting biological dose of irreversible damage to human skin caused by the ***,based on the burn theory in medicine and the actual tactical background,this paper redefines the evaluation criteria of the limiting laser dose of NLLW to the human ***,on the basis of anatomical knowledge,a 5-layer finite element model(FEM) of superficial skin is proposed,constructed and verified,which can accurately describe the limiting reversible *** on the optimized Pennes bioheat transfer equation,the diffusion approximation theory,the modified Beer-Lambert law,the Arrhenius equation,and combined with dynamic thermophysical parameters,this paper highly restored the temperature distribution and accurately solved the necrotic tissue distribution inside the human skin irradiated by 1064 nm ***,it is concluded that the maximum human dose of the1064 nm NLLW is 8.93 J/cm^(2),8.29J/cm^(2),and 8.17 J/cm^(2) when the light spots are 5 mm,10 mm and15 mm,respectively,and the corresponding output power of the weapon is 46.74 W,173.72 W and384.77 ***,the temperature and damage distribution in the tissue at the time of ultimate damage are discussed from the axial and radial dimensions,*** conclusions and analysis methods proposed in this paper are of great guiding significance for future research in military,medical and many other related fields.

关键词： Laser weapon Non-lethal Limit dose Tissue optics bioheat transfer Finite element

维普期刊数据库

Near-infrared laser irradiation of a multilayer agar-gel tissue phantom to induce thermal effect of traditional moxibustion

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2018年第6期11卷 21-32页

作者： Jiyong Cho Bibin Prasad Jung Kyung Kim Department of Mechanical Engineering Graduate School Kookmin UniversitySeoul 02707Republic of Korea Department of Radiation Oncology SMG-Seoul National University Boramae Medical Center Seoul 07061 Republic of Korea School of Mechanical Engineering and Department of Integrative Biomedical Science and Engineering Graduate School Kookmin University Seoul 02707Republic of Korea

Traditional moxibustion therapy can stimulate heat and blood-vessel expansion and advance blood *** the present study,a novel noncontact-type thermal therapeutic system was developed using a near-infrared laser *** device allows direct interaction of infrared laser light with the skin,thereby facilitating a controlled temperature distribution on the skin and the deep tissues below the *** using a tissue-mimicking phantom as a substitute for real skin,the most important optical and thermal parameters are the absorption/attenuation coefficient,thermal conductivity,and specic *** found that these parameters can be manipulated by varying the agar-gel ***,a multilayer tissue-mimicking phantom was fabricated using different agar-gel *** imaging and thermocouples were used to measure the temperature distribution inside the phantom during laser *** temperature increased with the increase in the agar-gel concentration and reached a maximum value under the tissue phantom *** induce a similar thermal effect of moxibustion therapy,controlled laser-irradiation parameters such as output power,wavelength and pulse width were obtained from further analysis of the temperature *** the known optothermal properties of the patient's skin,the temperature distribution inside the tissue was manipulated by optimizing the laser *** study can contribute to patient-specic thermal therapy in clinics.

关键词： Laser–tissue interaction tissue phantom moxibustion hyperthermia bioheat transfer

Exact analytical solution to three-dimensional phase change heat transfer problems in biological tissues subject to freezing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2009年第1期30卷 63-72页

作者：李方方刘静乐恺 Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100080 P. R. China Thermal Engineering Department University of Science and Technology BeijingBeijing 100080 P. R. China

Analytically solving a three-dimensional （3-D） bioheat transfer problem with phase change during a freezing process is extremely difficult but theoretically important. The moving heat source model and the Green function method are introduced to deal with the cryopreservation process of in vitro biomaterials. Exact solutions for the 3-D temperature transients of tissues under various boundary conditions, such as totally convective cooling, totally fixed temperature cooling and a hybrid between them on tissue surfaces, are obtained. Furthermore, the cryosurgical process in living tissues subject to freezing by a single or multiple cryoprobes is also analytically solved. A closed-form analytical solution to the bioheat phase change process is derived by considering contributions from blood perfusion heat transfer, metabolic heat generation, and heat sink of a cryoprobe. The present method is expected to have significant value for analytically solving complex bioheat transfer problems with phase change.

关键词： three-dimensional phase change heat transfer problem cryosurgery cryopreservation moving heat source model bioheat transfer Green's function analytical solution

维普期刊数据库

Simulation and computational heat transfer in the human eye with Dirichlet–Neumann domain decomposition approximation

在线全文

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2019年第6期10卷 107-128页

In this paper,a bioheat model of temperature distribution in the human eye is studied,the mathematical formulation of this model is described using adequate mathematical *** existence and the uniqueness of the solution of this problem is proven and four algorithms based on finite element method approximation and domain decomposition methods are presented in *** validation of all algorithm is done using a numerical application for an example where the analytical solution is *** properties and parameters reported in the open literature for the human eye are used to approximate numerically the temperature for bioheat model by finite element approximation and nonoverlapping domain decomposition *** obtained results that are verified using the experimental results recorded in the literature revealed a better accuracy by the use of algorithm proposed.

关键词： Nonoverlapping domain decomposition human eye bioheat transfer finite element computation

Numerical Simulation of Fluid and Heat transfer in a Biological Tissue Using an Immersed Boundary Method Mimicking the Exact Structure of the Microvascular Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2020年第2期16卷 281-296页

作者： Yuanliang Tang Lizhong Mu Ying He Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian116024China National Engineering Research Center for Healthcare Devices Guangdong Key Lab of Medical Electronic Instruments and Polymer Material ProductsGuangdong Institute of Medical InstrumentsGuangzhou510500China

The aim of this study is to develop a model of fluid and heat transfer in a biological tissue taking into account the exact structure of the related microvascular network,and to analyze the influence of structural changes of such a network induced by diabetes.A cubic region representing local skin tissue is selected as the computational domain,which in turn includes two intravascular and extravascular *** save computational resources,the capillary network is reduced to a 1D pipeline model and embedded into the extravascular *** the basis of the immersed boundary method(IBM)strategy,fluid and heat fluxes across a capillary wall are distributed to the surrounding tissue nodes by a delta *** consider both steady and periodic blood pressure conditions at the entrances of the capillary *** steady blood pressure conditions,both the interstitial fluid pressure and tissue temperature around the capillary network are larger than those in other *** the periodic blood pressure condition is considered,tissue temperature tends to fluctuate with the same frequency of the forcing,but the related waveform displays a smaller amplitude and a certain time(phase)*** the connectivity of capillary network is diminished,the capacity of blood redistribution through the capillary network becomes weaker and a subset of the vessel branches lose blood flow,which further aggravates the amplitude attenuation and time delay of the skin temperature fluctuation.

关键词： bioheat transfer porous media immersed boundary method diabetes microvascular dysfunction skin temperature fluctuation

Numerical study on thermal therapy of triple layer skin tissue using fractional bioheat model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第4期11卷 125-148页

作者： Sushil Kumar Ramesh S. Damor Ajay K. Shukla Department of Applied Mathematics & Humanities S. V. National Institute of Technology Surat Gujarat 395007 India L. E. College Sama Kanthe Morbi Gujarat 363642 India Department of Applied Mathematics & Humanities S. V. National Institute of Technology Snrat Gujarat 395007 India

This paper deals with the study of heat transfer and thermal damage in triple layer skin tissue using fractional bioheat model. Here, we consider three types of heating viz. sinusoidal heat flux, constant temperature and constant heat flux heating on skin surface. An implicit finite difference scheme is obtained by approximating fractional time derivative by quadrature formula and space derivative by central difference formula. The temperature profiles and thermal damage in the skin tissue are obtained to study the effect of fractional parameter a on diffusion process for constant temperature and heat flux boundary heating on skin surface. A parametric study for sinusoidal heat flux at skin surface has also been made.

关键词： bioheat transfer fractional calculus finite difference method triple layerskin thermal damage Caputo derivative.

A Computational Study on the Effect of Bifurcation Lesions with DifferentStructures on Blood Velocity and Temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2021年第3期17卷 639-651页

作者： Haoyu Wan Heng Zhang Zhizhu He Vehicle Engineering College of EngineeringChina Agricultural UniversityBeijing100083China

Treating coronary bifurcation stenosis is still a challenging task. Existing procedures still display a relatively smallrate of success. This paper aims to investigate numerically the effect of bifurcation lesions with different structureson the dynamics of blood flow and related temperature. The problem geometry is parametrically varied by changing the bifurcation angle and radius. A finite volume method is used to simulate the three-dimensional flow. Theeffects induced by the structure of the stenosis, the artery bifurcation angle and radius, and the inlet velocity ofblood are discussed in terms of flow pattern, pressure distribution, and shear stress at the blood wall. The heattransfer from the solid tissue is also determined for different stenosis configurations. The present study has beenconducted with the explicit intention to generate useful data for the development of methods curing the vascularstenosis with thermal ablation.

关键词： bioheat transfer arterial bifurcation stenosis blood thermal effect

Qualitative　Experimental　Evidences　for　the　Thermal　Wave　Mechanisms　of　Temperature　Oscillations　in　Living　Tissues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 1996年第4期5卷 266-270页

作者： JingLiu XingguoSun 等 ThermalEngineeringDepartment TsinghuaUniversityBeijing100084China AnesthesiaDepartment eifangMedica

To make it possible for the thermal wave theory on temperature oscillation (TO) effects in living tissues to be founded on the substantial experimental basis, a series of typical decisive experiments in vivo as well as in artificially simulating constructions were carried out. Conclusions obtained including some other scholars' animal experimental results all greatly support the thermal wave viewpoint qualitatively.A few experimental facts used hot to be easily understood from the classical viewpoint are also well reinterpreted. The revealing on the thermal wave mechanisms of TO in living tissues is a brand new discovery and deep insight into this important thermophysiological phenomenon. It may possibly promote new investigations on the corresponding topics in the field of bioheat transfer science.

关键词： bioheat transfer thermal physiology life phenomena temperature oscillation thermal wave in vivo experiments simulating experiments.

维普期刊数据库