Reducing the power and energy required by the device/circuit to operate is the main aim of this paper. Here the new design is implemented to reduce the power consumption of the device using the triggering pulses. The ...Reducing the power and energy required by the device/circuit to operate is the main aim of this paper. Here the new design is implemented to reduce the power consumption of the device using the triggering pulses. The proposed triggering method uses a complementary MOS transistor (pMOS and nMOS) as a voltage divider and ground leakage suppressor (i.e.);these designs are named as Trig01 and Trig10 designs. In Trig01 design the pair of CMOS is placed in the voltage divider part;similarly in Trig10 design the pair of CMOS is placed at the ground leakage suppressor part. Standard CMOS gates like NOT, NAND, NOR, EX-OR etc. are designed with these technologies and these gates are designed with 180 nm technology file in the cadence tool suite;compared to the normal CMOS gates, the Bi-Trig gate contains 4 inputs and 2 outputs. The two extra inputs are used as Bi-Trig control signaling inputs. There are 2 control inputs and thus 2<sup>2</sup> = 4 combination of controlling is done (i.e.);both pMOS and nMOS are ON, both pMOS and nMOS are OFF, pMOS ON and nMOS OFF and pMOS ON and nMOS ON. Depending on the usage of the circuit, the mode of operation is switched to any one of the combination. If the output of the circuit is not used anywhere in the total block, that specified circuit can be switched into idle mode by means of switched OFF both the pMOS and nMOS transistor in the control unit. This reduces the leakage current and also the power wastage of the circuits in the total block. Bi-Trig controlled circuit reduces the power consumption and leakage power of the circuit without affecting a performance of the circuits.展开更多
In this study,the vertical components of broadband teleseismic P wave data recorded by China Earthquake Network are used to image the rupture processes of the February 6th,2023 Turkish earthquake doublet via back proj...In this study,the vertical components of broadband teleseismic P wave data recorded by China Earthquake Network are used to image the rupture processes of the February 6th,2023 Turkish earthquake doublet via back projection analysis.Data in two frequency bands(0.5-2 Hz and 1-3 Hz)are used in the imaging processes.The results show that the rupture of the first event extends about 200 km to the northeast and about 150 km to the southwest,lasting~90 s in total.The southwestern rupture is triggered by the northeastern rupture,demonstrating a sequential bidirectional unilateral rupture pattern.The rupture of the second event extends approximately 80 km in both northeast and west directions,lasting~35 s in total and demonstrates a typical bilateral rupture feature.The cascading ruptures on both sides also reflect the occurrence of selective rupture behaviors on bifurcated faults.In addition,we observe super-shear ruptures on certain fault sections with relatively straight fault structures and sparse aftershocks.展开更多
网络控制系统通过通信网络连接传感器、控制器和执行器,实现远程监控和智能控制,具有突破地域限制的优势,但其开放性和网络依赖性也引入了诸多问题。首先,系统分析了网络控制系统中存在的信号量化误差、数据包丢失、网络时延、带宽占用...网络控制系统通过通信网络连接传感器、控制器和执行器,实现远程监控和智能控制,具有突破地域限制的优势,但其开放性和网络依赖性也引入了诸多问题。首先,系统分析了网络控制系统中存在的信号量化误差、数据包丢失、网络时延、带宽占用和网络安全威胁等问题;其次,在回顾网络控制系统研究成果的基础上,提出了新的控制策略,包括新型量化控制、随机丢包控制、时变时延的自触发控制、变采样周期智能调度控制、动态事件触发控制、DoS(denial of service)攻击的网络控制等;再次,归纳了相关的控制理论方法,包括随机系统法、预测控制法、时延估算与补偿、模糊反馈法、神经网络预测法;最后,提出了网络控制系统研究在未来面临的挑战。展开更多
利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear cur...利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear current decay,MTLL)对电流进行了模拟.在此基础上,采用时域有限差分方法(finite-difference time-domain,FDTD)和传输线模型研究了不同距离处的电场分布特征,并对58 m处产生的电场进行了比较.结果发现:当回击速度取1.3×10^(8) m/s时,辐射电场与实验垂直电场偏差较大,但与FDTD方法模拟的垂直电场符合一致.进一步,采用FDTD方法、偶极子方法、电荷-磁场极限估算法研究了58 m,90 m,1.6 km的磁场分布.与实验数据比较发现:不同计算方法与实验值在58 m和90 m处有一定差异,但在1.6 km处符合一致.展开更多
The accurate understanding of rockburst mechanism poses a global challenge in the field of rock mechanics.Particularly for strain rockburst,achieving self-initiated static-dynamic state transition is a crucial step in...The accurate understanding of rockburst mechanism poses a global challenge in the field of rock mechanics.Particularly for strain rockburst,achieving self-initiated static-dynamic state transition is a crucial step in the formation of catastrophic events.However,the state transition behavior and its impact on rockburst have not received sufficient attention,and are still poorly understood.Therefore,this study specifically focuses on the state transition behavior,aiming to investigate its abrupt transition process and formation mechanism,and triggering effects on rockburst.To facilitate the study,a novel burst rock-surrounding rock combined laboratory test model is proposed and its effectiveness is validated through experiment verification.Subsequently,corresponding numerical models are established using the three-dimensional(3D)discrete element method(DEM),enabling successful simulation of static brittle failure and rockbursts of varying intensities under quasi-static displacement loading conditions.Moreover,through secondary development,comprehensive recording of the mechanical and energy information pertaining to the combined specimen system and its subsystems is achieved.As a result of numerical investigation studies,the elastic rebound dynamic behavior of the surrounding rock was discovered and identified as the key factor triggering rockburst and controlling its intensity.The impact loading on the burst rock,induced by elastic rebound,directly initiates the dynamic processes of rockburst,serving as the direct cause.Additionally,the transient work and energy convergence towards the burst rock resulting from elastic rebound are recognized as the inherent cause of rockburst.Moreover,it has been observed that a larger extent of surrounding rock leads to a stronger elastic rebound,thereby directly contributing to a more intense rockburst.The findings can provide novel theoretical insights for the exploring of rockburst mechanism and the development of monitoring and prevention techniques.展开更多
为解决四自由度(4 degree-of-freedom,4-DOF)无人水面船在动态不确定性和外部扰动下的路径跟踪问题,提出一种基于有限时间积分视线(finite-time integral line-of-sight,FT-ILOS)制导的自适应神经网络路径跟踪控制方法。在视线(line-of-...为解决四自由度(4 degree-of-freedom,4-DOF)无人水面船在动态不确定性和外部扰动下的路径跟踪问题,提出一种基于有限时间积分视线(finite-time integral line-of-sight,FT-ILOS)制导的自适应神经网络路径跟踪控制方法。在视线(line-of-sight,LOS)制导框架下,利用有限时间理论,引入积分机制和新的制导机制,实现船舶位置跟踪误差的有限时间收敛,且避免制导积分项引起的饱和风险。基于反步控制法设计框架,结合FT-ILOS制导方法,利用自适应神经网络逼近复合扰动项,利用虚拟参数学习技术解决“维数灾难”问题,同时利用动态面控制技术降低计算复杂度。为减少执行器响应频率和磨损,在控制律与执行器之间建立周期事件触发协议。通过李雅普诺夫稳定性分析证明闭环控制系统中所有信号均有界,通过MATLAB仿真对比实验验证所提控制方法的有效性和鲁棒性。展开更多
This paper deals with the mode I crack problem of a cracked rubber sheet under plane stress condition using the delicate digital moiré technique. Through the four step phaseshifting method of automated fringe ana...This paper deals with the mode I crack problem of a cracked rubber sheet under plane stress condition using the delicate digital moiré technique. Through the four step phaseshifting method of automated fringe analysis, the displacement fields in the Cartesian coordinate system are given. By the coordinate-transform equation, the radial and circular displacement distributions in the polar coordinate system are obtained. The displacement isoline distributions and displacement vector distributions near the crack tip are discussed. The strain isoline distributions near the crack tip are also analyzed in this paper. Finally, the distribution rules for the mechanical fields near the crack tip are discussed with the sector division method.展开更多
文摘Reducing the power and energy required by the device/circuit to operate is the main aim of this paper. Here the new design is implemented to reduce the power consumption of the device using the triggering pulses. The proposed triggering method uses a complementary MOS transistor (pMOS and nMOS) as a voltage divider and ground leakage suppressor (i.e.);these designs are named as Trig01 and Trig10 designs. In Trig01 design the pair of CMOS is placed in the voltage divider part;similarly in Trig10 design the pair of CMOS is placed at the ground leakage suppressor part. Standard CMOS gates like NOT, NAND, NOR, EX-OR etc. are designed with these technologies and these gates are designed with 180 nm technology file in the cadence tool suite;compared to the normal CMOS gates, the Bi-Trig gate contains 4 inputs and 2 outputs. The two extra inputs are used as Bi-Trig control signaling inputs. There are 2 control inputs and thus 2<sup>2</sup> = 4 combination of controlling is done (i.e.);both pMOS and nMOS are ON, both pMOS and nMOS are OFF, pMOS ON and nMOS OFF and pMOS ON and nMOS ON. Depending on the usage of the circuit, the mode of operation is switched to any one of the combination. If the output of the circuit is not used anywhere in the total block, that specified circuit can be switched into idle mode by means of switched OFF both the pMOS and nMOS transistor in the control unit. This reduces the leakage current and also the power wastage of the circuits in the total block. Bi-Trig controlled circuit reduces the power consumption and leakage power of the circuit without affecting a performance of the circuits.
基金supported by the National Key R&D Program of China(No.2022YFF0800601)National Scientific Foundation of China(Nos.41930103 and 41774047).
文摘In this study,the vertical components of broadband teleseismic P wave data recorded by China Earthquake Network are used to image the rupture processes of the February 6th,2023 Turkish earthquake doublet via back projection analysis.Data in two frequency bands(0.5-2 Hz and 1-3 Hz)are used in the imaging processes.The results show that the rupture of the first event extends about 200 km to the northeast and about 150 km to the southwest,lasting~90 s in total.The southwestern rupture is triggered by the northeastern rupture,demonstrating a sequential bidirectional unilateral rupture pattern.The rupture of the second event extends approximately 80 km in both northeast and west directions,lasting~35 s in total and demonstrates a typical bilateral rupture feature.The cascading ruptures on both sides also reflect the occurrence of selective rupture behaviors on bifurcated faults.In addition,we observe super-shear ruptures on certain fault sections with relatively straight fault structures and sparse aftershocks.
文摘网络控制系统通过通信网络连接传感器、控制器和执行器,实现远程监控和智能控制,具有突破地域限制的优势,但其开放性和网络依赖性也引入了诸多问题。首先,系统分析了网络控制系统中存在的信号量化误差、数据包丢失、网络时延、带宽占用和网络安全威胁等问题;其次,在回顾网络控制系统研究成果的基础上,提出了新的控制策略,包括新型量化控制、随机丢包控制、时变时延的自触发控制、变采样周期智能调度控制、动态事件触发控制、DoS(denial of service)攻击的网络控制等;再次,归纳了相关的控制理论方法,包括随机系统法、预测控制法、时延估算与补偿、模糊反馈法、神经网络预测法;最后,提出了网络控制系统研究在未来面临的挑战。
文摘利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear current decay,MTLL)对电流进行了模拟.在此基础上,采用时域有限差分方法(finite-difference time-domain,FDTD)和传输线模型研究了不同距离处的电场分布特征,并对58 m处产生的电场进行了比较.结果发现:当回击速度取1.3×10^(8) m/s时,辐射电场与实验垂直电场偏差较大,但与FDTD方法模拟的垂直电场符合一致.进一步,采用FDTD方法、偶极子方法、电荷-磁场极限估算法研究了58 m,90 m,1.6 km的磁场分布.与实验数据比较发现:不同计算方法与实验值在58 m和90 m处有一定差异,但在1.6 km处符合一致.
基金supported by the National Natural Science Foundation of China(Grant Nos.U22A20597,and 42142019)the“Unveiling and Commanding”Project of Science and Technology Program of Tibet(Grant No.XZ202303ZY0006G)the Shanghai Peak Plateau Discipline(Class I).
文摘The accurate understanding of rockburst mechanism poses a global challenge in the field of rock mechanics.Particularly for strain rockburst,achieving self-initiated static-dynamic state transition is a crucial step in the formation of catastrophic events.However,the state transition behavior and its impact on rockburst have not received sufficient attention,and are still poorly understood.Therefore,this study specifically focuses on the state transition behavior,aiming to investigate its abrupt transition process and formation mechanism,and triggering effects on rockburst.To facilitate the study,a novel burst rock-surrounding rock combined laboratory test model is proposed and its effectiveness is validated through experiment verification.Subsequently,corresponding numerical models are established using the three-dimensional(3D)discrete element method(DEM),enabling successful simulation of static brittle failure and rockbursts of varying intensities under quasi-static displacement loading conditions.Moreover,through secondary development,comprehensive recording of the mechanical and energy information pertaining to the combined specimen system and its subsystems is achieved.As a result of numerical investigation studies,the elastic rebound dynamic behavior of the surrounding rock was discovered and identified as the key factor triggering rockburst and controlling its intensity.The impact loading on the burst rock,induced by elastic rebound,directly initiates the dynamic processes of rockburst,serving as the direct cause.Additionally,the transient work and energy convergence towards the burst rock resulting from elastic rebound are recognized as the inherent cause of rockburst.Moreover,it has been observed that a larger extent of surrounding rock leads to a stronger elastic rebound,thereby directly contributing to a more intense rockburst.The findings can provide novel theoretical insights for the exploring of rockburst mechanism and the development of monitoring and prevention techniques.
文摘为解决四自由度(4 degree-of-freedom,4-DOF)无人水面船在动态不确定性和外部扰动下的路径跟踪问题,提出一种基于有限时间积分视线(finite-time integral line-of-sight,FT-ILOS)制导的自适应神经网络路径跟踪控制方法。在视线(line-of-sight,LOS)制导框架下,利用有限时间理论,引入积分机制和新的制导机制,实现船舶位置跟踪误差的有限时间收敛,且避免制导积分项引起的饱和风险。基于反步控制法设计框架,结合FT-ILOS制导方法,利用自适应神经网络逼近复合扰动项,利用虚拟参数学习技术解决“维数灾难”问题,同时利用动态面控制技术降低计算复杂度。为减少执行器响应频率和磨损,在控制律与执行器之间建立周期事件触发协议。通过李雅普诺夫稳定性分析证明闭环控制系统中所有信号均有界,通过MATLAB仿真对比实验验证所提控制方法的有效性和鲁棒性。
基金Project supported by the National Natural Sciences Foundation of China (No. 10572102).
文摘This paper deals with the mode I crack problem of a cracked rubber sheet under plane stress condition using the delicate digital moiré technique. Through the four step phaseshifting method of automated fringe analysis, the displacement fields in the Cartesian coordinate system are given. By the coordinate-transform equation, the radial and circular displacement distributions in the polar coordinate system are obtained. The displacement isoline distributions and displacement vector distributions near the crack tip are discussed. The strain isoline distributions near the crack tip are also analyzed in this paper. Finally, the distribution rules for the mechanical fields near the crack tip are discussed with the sector division method.
