A computer software to simulate the phase transformation during quenching is designed based on Avrami equation and Scheil additivity principle of incubation period. The isothermal transformation diagrams of supercool...A computer software to simulate the phase transformation during quenching is designed based on Avrami equation and Scheil additivity principle of incubation period. The isothermal transformation diagrams of supercooled austenite are described by cubic spline functions. This software is possess of a good graphic interface of Windows style, can simulate the whole process in austenite decomposition during continuous cooling. If the cooling rate was given, the fraction of various microstructures transformed of austenite decomposition during continuous cooling at any temperature can be calculated. The simulation results are checked with the quenching experiment of 45 steel. The results indicate that the simulation results are comparatively close to the experimental results.展开更多
Nd-rich phase plays an important role in the magnetic properties of sintered NdFeB alloy. The proportion of Nd-rich phase to all the other phases was calculated by using MATLAB 6.5 software. Especially, post-sintered ...Nd-rich phase plays an important role in the magnetic properties of sintered NdFeB alloy. The proportion of Nd-rich phase to all the other phases was calculated by using MATLAB 6.5 software. Especially, post-sintered alloy, post-high-temperature tempered alloy and post-high and low-temperature tempered alloy were analyzed. It was found that the proportion of Nd-rich phase in the three alloys based on SEM (scanning electron microscope) images was about 8.22%, 8.03% and 8.00%, respectively.展开更多
This paper presents the design of a computational software system that enables solutions of multi-phase and multi-scale problems in mechanics. It demonstrated how mechanicians can design “process-driven” software sy...This paper presents the design of a computational software system that enables solutions of multi-phase and multi-scale problems in mechanics. It demonstrated how mechanicians can design “process-driven” software systems directly, and that such efforts are more suitable in solving multi-phase or multi-scale problems, rather than utilizing the “data-driven” approaches of legacy network systems. Specifically, this paper demonstrates how this approach can be used to solve problems in flexible dynamics. Then it suggests a view of mechanics algorithms as ‘state equilibrium’ enforcers residing as servers, rather than as computer programs that solve field equations. It puts forth the need for identical input/output files to ensure widespread deployment on laptops. Then it presents an assessment of the laptop platform. A software system such as the one presented here can also be used to supply virtual environments, animations and entertainment/education software with physics.展开更多
Software reliability modeling and prediction are important issues during software development, especially when one has to reach a desired reliability prior to software release. Various techniques, both static and dyna...Software reliability modeling and prediction are important issues during software development, especially when one has to reach a desired reliability prior to software release. Various techniques, both static and dynamic, are used for reliability modeling and prediction in the context of software risk management. The single-phase Rayleigh model is a dynamic reliability model;however, it is not suitable for software release date prediction. We propose a new multi-phase truncated Rayleigh model and obtain parameter estimation using the nonlinear least squares method. The proposed model has been successfully tested in a large software company for several software projects. It is shown that the two-phase truncated Rayleigh model outperforms the traditional single-phase Rayleigh model in modeling weekly software defect arrival data. The model is useful for project management in planning release times and defect management.展开更多
Suppressing jitter noises in a phase locked loop（ PLL） is of great importance in order to keep precise and continuous track of global positioning system （GPS）signals characterized by low carrier-to-noise ratio（ C...Suppressing jitter noises in a phase locked loop（ PLL） is of great importance in order to keep precise and continuous track of global positioning system （GPS）signals characterized by low carrier-to-noise ratio（ C/No ）. This article proposes and analyzes an improved Kalman-filter-based PLL to process weak carrier signals in GPS software receivers. After reviewing the optimal-bandwidth-based traditional second-order PLL, a Kalman-filter-based estimation algorithm is implemented for the new PLL by decorrelating the model error noises and the measurement noises. Finally,the efficiency of this new Kalman-filter-based PLL is verified by experimental data. Compared to the traditional second-order PLL, this new PLL is in position to make correct estimation of the carrier phase differences and Doppler shifts with less overshoots and noise disturbances and keeps an effective check on the disturbances out of jitter noises in PLL. The results show that during processing normal signals,this improved PLL reduces the standard deviation from 0. 010 69 cycle to 0. 007 63 cycle, and for weak signal processing,the phase jitter range and the Doppler shifts can be controlled within ± 17° and ±5 Hz as against ±25° and ＋ 15 Hz by the traditional PLL.展开更多
The quality element of a design class is important as it has a substantial listed influence on overall required quality of the software. The complexity and lengthy codes of program severely affect several quality meas...The quality element of a design class is important as it has a substantial listed influence on overall required quality of the software. The complexity and lengthy codes of program severely affect several quality measures, especially efficiency of the final delivered software. This paper does an appropriate review on efficiency of object oriented software, and suggests some relevant information about class design level efficiency. Program efficiency is an important factor to software quality. Moreover, if software efficiency analysis has been done in the early steps of the software creation process then it assures as a criterion to software quality. This article proposes a comprehensive research idea for estimation of the efficiency index. Subsequently, it does an extremely methodical review on design efficiency of software. After that, a design metric based efficiency estimation model at the design time has been proposed by creating the link between design properties of the program and efficiency criteria. Furthermore, the correlation is mapped among all with the help of statistical values for selected design properties and efficiency criteria. In addition, efficiency estimation model is empirically validated with try-out data.展开更多
This study investigates the potential for enhancing the thermal performance of external walls insulation in warmer climates through the combination of phase change materials(PCMs)and bio-based materials,specifically h...This study investigates the potential for enhancing the thermal performance of external walls insulation in warmer climates through the combination of phase change materials(PCMs)and bio-based materials,specifically hemp wool and wood wool.Experimental tests using the heat flow method(HFM),and numerical simulations with ANSYS Fluent software were conducted to assess the dynamic thermal distribution and fluid-mechanical aspects of phase change materials(PCMs)within composite walls.The results demonstrate a notable reduction in peak indoor temperatures,achieving a 58%reduction with hemp wool with a close 40%reduction with wood wool when combined with PCMs.Fluid-mechanical analysis indicates that PCMs act as efficient indoor temperature regulators by storing excess heat during hot periods and releasing it later during phase transitions.Furthermore,the homogeneous distribution of the liquid fraction and natural convection during phase change contribute significantly to the improvement in heat transfer rates,resulting in a 96%reduction compared to hemp wool and wood wool without PCMs.展开更多
The use of artificial intelligence(AI)in wound care has become a crucial instrument in improving the diagnosis,treatment,and management of chronic wounds.This study examines the several functions of AI in wound care,e...The use of artificial intelligence(AI)in wound care has become a crucial instrument in improving the diagnosis,treatment,and management of chronic wounds.This study examines the several functions of AI in wound care,emphasizing its ability to better wound evaluation,hasten healing,alleviate pain,and improve cost-effectiveness.AI-driven technology,including mobile applications and intelligent bandages,provides precise wound assessment,tissue analysis,and continuous monitoring,hence allowing for tailored treatment strategies and prompt intervention.Moreover,AI-driven algorithms forecast wound healing trajectories and find individuals susceptible to chronic wounds,allowing prompt preventative interventions.There are also practical issues with integrating it into clinical practice.Adding AI to current healthcare systems,like electronic medical records(EMRs),needs careful planning and teamwork to make sure that AI-driven insights are used well in real-time clinical decision-making.To make sure AI is used safely,legal frameworks need to be set up to provide clear rules for its use in healthcare.These frameworks should include openness,risk management,and data evaluation.Lastly,clinical validation and acceptance are still big problems.Many AI-powered tools don't have enough clinical validation and aren't widely available,which makes it hard to use them in everyday clinical practice.Solving these problems is important for getting the most out of AI in wound care and making sure it is used safely and effectively.The article combines current advancements and prospective trajectories in AI-assisted wound care,highlighting its revolutionary ability to revolutionize patient outcomes and healthcare delivery.展开更多
为解决软件无线电(Software Defined Radio,SDR)中采样后信号混叠问题,提出了一种改进的相位调整滤波算法。依托具备可调时间延迟的二阶射频带通采样前端,设计了一种支持多分点分段滤波的抗混叠滤波器,可以根据实际需求灵活设置多个频...为解决软件无线电(Software Defined Radio,SDR)中采样后信号混叠问题,提出了一种改进的相位调整滤波算法。依托具备可调时间延迟的二阶射频带通采样前端,设计了一种支持多分点分段滤波的抗混叠滤波器,可以根据实际需求灵活设置多个频率分点,从而实现针对不同频段的精确滤波。通过在MATLAB SIMULINK中进行仿真验证,该方法相比同类方法的滤波器抑制效果更佳,达到38 dB以上,并能有效滤除所需信号而不影响其他信号的完整性,简化了接收前端,具备较强的灵活性和适应性,能够更好地支持未来的通信技术和高密度通信连接。展开更多
文摘A computer software to simulate the phase transformation during quenching is designed based on Avrami equation and Scheil additivity principle of incubation period. The isothermal transformation diagrams of supercooled austenite are described by cubic spline functions. This software is possess of a good graphic interface of Windows style, can simulate the whole process in austenite decomposition during continuous cooling. If the cooling rate was given, the fraction of various microstructures transformed of austenite decomposition during continuous cooling at any temperature can be calculated. The simulation results are checked with the quenching experiment of 45 steel. The results indicate that the simulation results are comparatively close to the experimental results.
基金Funded by the Key Project of Sichan Science Department (2012 JY0045, 2011SZZ029)Key Project of Sichan Education Department (10ZA060, 11ZA161)+1 种基金Key Project of Mianyang Municipal Science and Technology Bureau (10Y002-4)Special Project of MianYang Normal University (2011C02)
文摘Nd-rich phase plays an important role in the magnetic properties of sintered NdFeB alloy. The proportion of Nd-rich phase to all the other phases was calculated by using MATLAB 6.5 software. Especially, post-sintered alloy, post-high-temperature tempered alloy and post-high and low-temperature tempered alloy were analyzed. It was found that the proportion of Nd-rich phase in the three alloys based on SEM (scanning electron microscope) images was about 8.22%, 8.03% and 8.00%, respectively.
文摘This paper presents the design of a computational software system that enables solutions of multi-phase and multi-scale problems in mechanics. It demonstrated how mechanicians can design “process-driven” software systems directly, and that such efforts are more suitable in solving multi-phase or multi-scale problems, rather than utilizing the “data-driven” approaches of legacy network systems. Specifically, this paper demonstrates how this approach can be used to solve problems in flexible dynamics. Then it suggests a view of mechanics algorithms as ‘state equilibrium’ enforcers residing as servers, rather than as computer programs that solve field equations. It puts forth the need for identical input/output files to ensure widespread deployment on laptops. Then it presents an assessment of the laptop platform. A software system such as the one presented here can also be used to supply virtual environments, animations and entertainment/education software with physics.
文摘Software reliability modeling and prediction are important issues during software development, especially when one has to reach a desired reliability prior to software release. Various techniques, both static and dynamic, are used for reliability modeling and prediction in the context of software risk management. The single-phase Rayleigh model is a dynamic reliability model;however, it is not suitable for software release date prediction. We propose a new multi-phase truncated Rayleigh model and obtain parameter estimation using the nonlinear least squares method. The proposed model has been successfully tested in a large software company for several software projects. It is shown that the two-phase truncated Rayleigh model outperforms the traditional single-phase Rayleigh model in modeling weekly software defect arrival data. The model is useful for project management in planning release times and defect management.
基金National Natural Science Foundation of China(40671155)National High-tech Research and Development Programof China(2006AA12A108)Research Program of Hong Kong Polytech-nic University(G-U203)
文摘Suppressing jitter noises in a phase locked loop（ PLL） is of great importance in order to keep precise and continuous track of global positioning system （GPS）signals characterized by low carrier-to-noise ratio（ C/No ）. This article proposes and analyzes an improved Kalman-filter-based PLL to process weak carrier signals in GPS software receivers. After reviewing the optimal-bandwidth-based traditional second-order PLL, a Kalman-filter-based estimation algorithm is implemented for the new PLL by decorrelating the model error noises and the measurement noises. Finally,the efficiency of this new Kalman-filter-based PLL is verified by experimental data. Compared to the traditional second-order PLL, this new PLL is in position to make correct estimation of the carrier phase differences and Doppler shifts with less overshoots and noise disturbances and keeps an effective check on the disturbances out of jitter noises in PLL. The results show that during processing normal signals,this improved PLL reduces the standard deviation from 0. 010 69 cycle to 0. 007 63 cycle, and for weak signal processing,the phase jitter range and the Doppler shifts can be controlled within ± 17° and ±5 Hz as against ±25° and ＋ 15 Hz by the traditional PLL.
文摘The quality element of a design class is important as it has a substantial listed influence on overall required quality of the software. The complexity and lengthy codes of program severely affect several quality measures, especially efficiency of the final delivered software. This paper does an appropriate review on efficiency of object oriented software, and suggests some relevant information about class design level efficiency. Program efficiency is an important factor to software quality. Moreover, if software efficiency analysis has been done in the early steps of the software creation process then it assures as a criterion to software quality. This article proposes a comprehensive research idea for estimation of the efficiency index. Subsequently, it does an extremely methodical review on design efficiency of software. After that, a design metric based efficiency estimation model at the design time has been proposed by creating the link between design properties of the program and efficiency criteria. Furthermore, the correlation is mapped among all with the help of statistical values for selected design properties and efficiency criteria. In addition, efficiency estimation model is empirically validated with try-out data.
文摘This study investigates the potential for enhancing the thermal performance of external walls insulation in warmer climates through the combination of phase change materials(PCMs)and bio-based materials,specifically hemp wool and wood wool.Experimental tests using the heat flow method(HFM),and numerical simulations with ANSYS Fluent software were conducted to assess the dynamic thermal distribution and fluid-mechanical aspects of phase change materials(PCMs)within composite walls.The results demonstrate a notable reduction in peak indoor temperatures,achieving a 58%reduction with hemp wool with a close 40%reduction with wood wool when combined with PCMs.Fluid-mechanical analysis indicates that PCMs act as efficient indoor temperature regulators by storing excess heat during hot periods and releasing it later during phase transitions.Furthermore,the homogeneous distribution of the liquid fraction and natural convection during phase change contribute significantly to the improvement in heat transfer rates,resulting in a 96%reduction compared to hemp wool and wood wool without PCMs.
文摘The use of artificial intelligence(AI)in wound care has become a crucial instrument in improving the diagnosis,treatment,and management of chronic wounds.This study examines the several functions of AI in wound care,emphasizing its ability to better wound evaluation,hasten healing,alleviate pain,and improve cost-effectiveness.AI-driven technology,including mobile applications and intelligent bandages,provides precise wound assessment,tissue analysis,and continuous monitoring,hence allowing for tailored treatment strategies and prompt intervention.Moreover,AI-driven algorithms forecast wound healing trajectories and find individuals susceptible to chronic wounds,allowing prompt preventative interventions.There are also practical issues with integrating it into clinical practice.Adding AI to current healthcare systems,like electronic medical records(EMRs),needs careful planning and teamwork to make sure that AI-driven insights are used well in real-time clinical decision-making.To make sure AI is used safely,legal frameworks need to be set up to provide clear rules for its use in healthcare.These frameworks should include openness,risk management,and data evaluation.Lastly,clinical validation and acceptance are still big problems.Many AI-powered tools don't have enough clinical validation and aren't widely available,which makes it hard to use them in everyday clinical practice.Solving these problems is important for getting the most out of AI in wound care and making sure it is used safely and effectively.The article combines current advancements and prospective trajectories in AI-assisted wound care,highlighting its revolutionary ability to revolutionize patient outcomes and healthcare delivery.
文摘为解决软件无线电(Software Defined Radio,SDR)中采样后信号混叠问题,提出了一种改进的相位调整滤波算法。依托具备可调时间延迟的二阶射频带通采样前端,设计了一种支持多分点分段滤波的抗混叠滤波器,可以根据实际需求灵活设置多个频率分点,从而实现针对不同频段的精确滤波。通过在MATLAB SIMULINK中进行仿真验证,该方法相比同类方法的滤波器抑制效果更佳,达到38 dB以上,并能有效滤除所需信号而不影响其他信号的完整性,简化了接收前端,具备较强的灵活性和适应性,能够更好地支持未来的通信技术和高密度通信连接。
