The simulation techniques of hardware-in-loop simulation(HLS) of homing antitank missile based on the personal computer (PC) are discussed. The PC and MCS-96 chip controller employ A/D and D/A boards (with photoelectr...The simulation techniques of hardware-in-loop simulation(HLS) of homing antitank missile based on the personal computer (PC) are discussed. The PC and MCS-96 chip controller employ A/D and D/A boards (with photoelectricity isolation) to transfer measur ment and control information about homing head, gyro and rudder and utilize the digital hand shaking board to build correct communication communication protocol. In order to satisfy the real-time requirement of HLS, this paper first simplifies the aerodynamic data file reasonably, then builds a PC software with C language. The program of the controller part is made with PL/M language. The simulation of HLS based on PC is done with the same sampling period of 10ms as that of YH-F1 and the experiment results are identical to those of digital simulation of the homing anti-tank guided missile.展开更多
目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中...目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中心”或“以瞳孔为中心”分为角膜顶点组和瞳孔中心组。术前及术后3个月,通过Pentacam测量手术前后以角膜顶点为中心和以瞳孔为中心2 mm、4 mm、6 mm圆环和区域模式下患者角膜前表面屈光力(ASF)、角膜真实净屈光力(TNP)和总角膜屈光力(TCRP);以角膜顶点为中心和以瞳孔为中心测量的同一指标之间采用Kendall W值进行一致性分析。结果术前圆环模式下:角膜顶点组4 mm ASF、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高,6 mm TCRP较瞳孔中心组低(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前区域模式下:角膜顶点组4 mm ASF、2 mm TNP、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术后3个月仅圆环模式下角膜顶点组2 mm ASF较瞳孔中心组高,差异有统计学意义(P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前及术后3个月不同模式下两组患者各指标Kendall W值位于0.978~0.999间,各项结果一致性较好(均为P<0.05)。结论超声乳化白内障吸除术前后患者角膜不同区域和不同中心范围内部分角膜参数有所变化,总体比较以角膜顶点为中心和以瞳孔为中心测量的角膜参数一致性较好。展开更多
Molecular dynamics with the stochastic process provides a convenient way to compute structural and thermodynamic properties of chemical, biological, and materials systems. It is demonstrated that the virtual dynamics ...Molecular dynamics with the stochastic process provides a convenient way to compute structural and thermodynamic properties of chemical, biological, and materials systems. It is demonstrated that the virtual dynamics case that we proposed for the Langevin equation [J. Chem. Phys. 147, 184104 （2017）] in principle exists in other types of stochastic thermostats as well. The recommended ＂middle＂ scheme [J. Chem. Phys. 147, 034109 （2017）] of the Andersen thermostat is investigated as an example. As shown by both analytic and numerical results, while the real and virtual dynamics cases approach the same plateau of the characteristic correlation time in the high collision frequency limit, the accuracy and efficiency of sampling are relatively insensitive to the value of the collision frequency in a broad range. After we compare the behaviors of the Andersen thermostat to those of Langevin dynamics, a heuristic schematic representation thermostatting processes with molecular is proposed for understanding efficient stochastic dynamics.展开更多
In this paper, graphical-user-interface （GUI） software for simulation and fuzzy-logic control of a remotely operated vehicle （ROV） using MATLABTM GUI Designing Environment is proposed. The proposed ROV＇s GUI plat...In this paper, graphical-user-interface （GUI） software for simulation and fuzzy-logic control of a remotely operated vehicle （ROV） using MATLABTM GUI Designing Environment is proposed. The proposed ROV＇s GUI platform allows the controller such as fuzzy-logic control systems design to be compared with other controllers such as proportional-integral-derivative （PID） and sliding-mode controller （SMC） systematically and interactively. External disturbance such as sea current can he added to improve the modelling in actual underwater environment. The simulated results showed the position responses of the fuzzy-logic control exhibit reasonable performance under the sea current disturbance.展开更多
For the first time detailed measurements of the DOS （density of states） for Ti3AIC2 and Ti3SiC2 are presented at temperatures between T = 10 and 100 K. For Ti3AIC2 a DFT （density functional theory） simulation of l...For the first time detailed measurements of the DOS （density of states） for Ti3AIC2 and Ti3SiC2 are presented at temperatures between T = 10 and 100 K. For Ti3AIC2 a DFT （density functional theory） simulation of lattice dynamics is compared to experimental data demonstrating a noticeable difference between the spectra especially below 40 meV. In the case of Ti3SiC2 the DFT model is augmented with MD （molecular dynamics） simulations resulting in the measured and simulated spectra resembling one another more closely but still having significant differences below 40 meV. Within the experimental spectra, there are features up to and including 20 meV which are unaccounted for by the simulation. Tracing individual atoms generated by the computer models suggests anharmonic motion of Si within the Ti3SiC2. The results presented could explain differences between calculated elastic moduli using DFT harmonic lattice dynamics simulations and results from recent experiments.展开更多
文摘The simulation techniques of hardware-in-loop simulation(HLS) of homing antitank missile based on the personal computer (PC) are discussed. The PC and MCS-96 chip controller employ A/D and D/A boards (with photoelectricity isolation) to transfer measur ment and control information about homing head, gyro and rudder and utilize the digital hand shaking board to build correct communication communication protocol. In order to satisfy the real-time requirement of HLS, this paper first simplifies the aerodynamic data file reasonably, then builds a PC software with C language. The program of the controller part is made with PL/M language. The simulation of HLS based on PC is done with the same sampling period of 10ms as that of YH-F1 and the experiment results are identical to those of digital simulation of the homing anti-tank guided missile.
文摘目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中心”或“以瞳孔为中心”分为角膜顶点组和瞳孔中心组。术前及术后3个月,通过Pentacam测量手术前后以角膜顶点为中心和以瞳孔为中心2 mm、4 mm、6 mm圆环和区域模式下患者角膜前表面屈光力(ASF)、角膜真实净屈光力(TNP)和总角膜屈光力(TCRP);以角膜顶点为中心和以瞳孔为中心测量的同一指标之间采用Kendall W值进行一致性分析。结果术前圆环模式下:角膜顶点组4 mm ASF、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高,6 mm TCRP较瞳孔中心组低(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前区域模式下:角膜顶点组4 mm ASF、2 mm TNP、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术后3个月仅圆环模式下角膜顶点组2 mm ASF较瞳孔中心组高,差异有统计学意义(P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前及术后3个月不同模式下两组患者各指标Kendall W值位于0.978~0.999间,各项结果一致性较好(均为P<0.05)。结论超声乳化白内障吸除术前后患者角膜不同区域和不同中心范围内部分角膜参数有所变化,总体比较以角膜顶点为中心和以瞳孔为中心测量的角膜参数一致性较好。
文摘Molecular dynamics with the stochastic process provides a convenient way to compute structural and thermodynamic properties of chemical, biological, and materials systems. It is demonstrated that the virtual dynamics case that we proposed for the Langevin equation [J. Chem. Phys. 147, 184104 （2017）] in principle exists in other types of stochastic thermostats as well. The recommended ＂middle＂ scheme [J. Chem. Phys. 147, 034109 （2017）] of the Andersen thermostat is investigated as an example. As shown by both analytic and numerical results, while the real and virtual dynamics cases approach the same plateau of the characteristic correlation time in the high collision frequency limit, the accuracy and efficiency of sampling are relatively insensitive to the value of the collision frequency in a broad range. After we compare the behaviors of the Andersen thermostat to those of Langevin dynamics, a heuristic schematic representation thermostatting processes with molecular is proposed for understanding efficient stochastic dynamics.
基金Supported by the Newcastle University’s Project Account:C0570D2330
文摘In this paper, graphical-user-interface （GUI） software for simulation and fuzzy-logic control of a remotely operated vehicle （ROV） using MATLABTM GUI Designing Environment is proposed. The proposed ROV＇s GUI platform allows the controller such as fuzzy-logic control systems design to be compared with other controllers such as proportional-integral-derivative （PID） and sliding-mode controller （SMC） systematically and interactively. External disturbance such as sea current can he added to improve the modelling in actual underwater environment. The simulated results showed the position responses of the fuzzy-logic control exhibit reasonable performance under the sea current disturbance.
文摘For the first time detailed measurements of the DOS （density of states） for Ti3AIC2 and Ti3SiC2 are presented at temperatures between T = 10 and 100 K. For Ti3AIC2 a DFT （density functional theory） simulation of lattice dynamics is compared to experimental data demonstrating a noticeable difference between the spectra especially below 40 meV. In the case of Ti3SiC2 the DFT model is augmented with MD （molecular dynamics） simulations resulting in the measured and simulated spectra resembling one another more closely but still having significant differences below 40 meV. Within the experimental spectra, there are features up to and including 20 meV which are unaccounted for by the simulation. Tracing individual atoms generated by the computer models suggests anharmonic motion of Si within the Ti3SiC2. The results presented could explain differences between calculated elastic moduli using DFT harmonic lattice dynamics simulations and results from recent experiments.
