A novel method is presented to build the triangular surface model and calculate the tangential stress and strain of myocardial wall ,which can be further used to reflect the left ventricle twisting—a sensitive index ...A novel method is presented to build the triangular surface model and calculate the tangential stress and strain of myocardial wall ,which can be further used to reflect the left ventricle twisting—a sensitive index to assess the systolic and diastolic function of heart. Firstly, a point distribution model is used to obtain the feature points of the ventricular surface in medical images. Secondly, the surface model is constructed by triangular mesh, and then the subdivision strategy is introduced to refine the model. Thirdly, plane projection and finite element method(FEM) are applied to calculate the tangential stress and strain.Finally, the distribution of tangential modulus of elasticity is discussed. The stimulation results show that the proposed method can be used to compute the tangential stress and strain of myocardial wall effectively and the computing result is consistent with the results mentioned in the literatures.展开更多
To establish a database of muscle strength of the Chinese people. The study sampled data of 843 Chinese young males all over the country. Back force, hand twisting force and arm force of four different exerting direct...To establish a database of muscle strength of the Chinese people. The study sampled data of 843 Chinese young males all over the country. Back force, hand twisting force and arm force of four different exerting directions (pull, push, adduction and abduction) were measured. Comparisons are made between the results of this study and those from other documents. Different types strength were also compared. The factors of stature and weight influenced on muscle force were analyzed. There are obvious differences of arm strength in four directions and it can be ordered as push, pull, adduction and abduction, the push force is the largest and the abduction force is the least. The significant correlation exists between different types force. Weight has an obvious influence on one's force among above three factors. The database of Chinese young males is established for the first time. Results of the study can provide help for ergonomist, the worker of occupation health and the researcher of rehabilitation.展开更多
Cytoskeleton is a network of filamentous proteins, such as actin filaments and microtubules. We propose a continuum cooperative hydrolysis model which possesses exactly analytical solution to describe the dynamics of ...Cytoskeleton is a network of filamentous proteins, such as actin filaments and microtubules. We propose a continuum cooperative hydrolysis model which possesses exactly analytical solution to describe the dynamics of filament. The results show that the cooperativRy leads to non negative-exponential distribution of T （ATP or GTP） subunits. As an application, we investigate the treadmilling phenomenon using our model. It is shown that the cooperativity remarkably affects the length of filament.展开更多
基金supported by the National Natural Science Foundation of China and Microsoft Research Asia ( No. NSFC-60870002 No. 60802087)+2 种基金NCET and the Science and Technology Department of Zhejiang Province ( No. 2009C21008 No. 2010R10006 No. 2010C33095)
文摘A novel method is presented to build the triangular surface model and calculate the tangential stress and strain of myocardial wall ,which can be further used to reflect the left ventricle twisting—a sensitive index to assess the systolic and diastolic function of heart. Firstly, a point distribution model is used to obtain the feature points of the ventricular surface in medical images. Secondly, the surface model is constructed by triangular mesh, and then the subdivision strategy is introduced to refine the model. Thirdly, plane projection and finite element method(FEM) are applied to calculate the tangential stress and strain.Finally, the distribution of tangential modulus of elasticity is discussed. The stimulation results show that the proposed method can be used to compute the tangential stress and strain of myocardial wall effectively and the computing result is consistent with the results mentioned in the literatures.
基金Natural Science Foundation of China grant number: 31170895,11072021
文摘To establish a database of muscle strength of the Chinese people. The study sampled data of 843 Chinese young males all over the country. Back force, hand twisting force and arm force of four different exerting directions (pull, push, adduction and abduction) were measured. Comparisons are made between the results of this study and those from other documents. Different types strength were also compared. The factors of stature and weight influenced on muscle force were analyzed. There are obvious differences of arm strength in four directions and it can be ordered as push, pull, adduction and abduction, the push force is the largest and the abduction force is the least. The significant correlation exists between different types force. Weight has an obvious influence on one's force among above three factors. The database of Chinese young males is established for the first time. Results of the study can provide help for ergonomist, the worker of occupation health and the researcher of rehabilitation.
基金Supported by Chinese Universities Scientific Fund under Grant No.2014YB029National Natural Science Foundation of China under Grant No.11205123
文摘Cytoskeleton is a network of filamentous proteins, such as actin filaments and microtubules. We propose a continuum cooperative hydrolysis model which possesses exactly analytical solution to describe the dynamics of filament. The results show that the cooperativRy leads to non negative-exponential distribution of T （ATP or GTP） subunits. As an application, we investigate the treadmilling phenomenon using our model. It is shown that the cooperativity remarkably affects the length of filament.
