Single Phase Induction Motor(SPIM)is widely used in industries at starting stage to provide high starting torque.The objective of the work is to develop a drive for Single Phase Induction Motor that does not use a sta...Single Phase Induction Motor(SPIM)is widely used in industries at starting stage to provide high starting torque.The objective of the work is to develop a drive for Single Phase Induction Motor that does not use a start or run capacitor.In this work,the researchers present the details about Maximum Power Point Tracking using series-compensated Buck Boost Converter,resonant Direct Current(DC)to Alternate Current(AC)inverter and matrix converter-based drive.The proposed method provides a variable starting torque feature that can be adjusted depending upon machine load to ensure Power Quality(PQ).The system uses Series Compensated Buck Boost Converter(SCBBC)to derive the power from solar source and a Partial Resonant Inverter(PRI)between the Matrix Converter(MC)and DC link battery to reduce the switching loss.The application of Space Vector Pulse Width Modulation(SVPWM)ensures the improvement of power quality at driving terminals of SPIM.The proposed system has been math-ematically modelled and simulated in MATLAB SIMULINK environment and was validated using standardized experimental verification.展开更多
河流袭夺现象是揭示构造-气候-地表过程耦合效应的关键地貌过程。传统研究方法依赖高成本的野外勘查与实验分析,成本高、周期长,亟需发展高效的识别技术。江西庐山处于长江中游典型构造-气候耦合作用活跃区,其密集的水网系统频繁受控于...河流袭夺现象是揭示构造-气候-地表过程耦合效应的关键地貌过程。传统研究方法依赖高成本的野外勘查与实验分析,成本高、周期长,亟需发展高效的识别技术。江西庐山处于长江中游典型构造-气候耦合作用活跃区,其密集的水网系统频繁受控于构造运动与侵蚀基准面变化,为河流袭夺现象的研究提供了丰富的样本空间。本研究基于12.5 m分辨率DEM数据,集成水力侵蚀模型(Stream-Power Incision Model,SPIM)的衍生参数——河道面积积分χ值与河道陡峭指数k_(sn),构建χ-k_(sn)参数值综合分析河流袭夺的识别方法,对江西庐山大校场、锦绣谷两个典型流域内的河流袭夺现象开展验证,评估该方法在复杂地貌背景下的适用性与识别效率。研究结果表明:(1)运用χ-k_(sn)值进行河流袭夺现象快速识别,该方法具有高效性与可靠性,成果与区域地质记录及历史水文记录高度吻合。(2)在技术操作上,选用0.45作为参考凹度值时,χ-k_(sn)值分析可显著提升河流网络识别灵敏度,其生成的高程-面积关系(χ-plot)图呈现更优的对称性、更清晰的凸型轮廓特征,且相较其他值图像离散度可降低约28.57%,更契合庐山陡峭山地河流的袭夺判别需求。(3)对庐山两个典型流域进行案例验证发现:根据χ值分析,大校场流域内大校场河与长冲河中下游段、锦绣谷流域内西谷河上游与锦绣谷河干流2处χ值差异相较流域其他区域更高,据此在两流域各锁定1处可疑袭夺区;陡峭指数k_(sn)分析进一步揭示,大校场河流域芦林湖大坝附近河段k_(sn)异常峰值,达92.92 m 0.9,较流域其他河段均值高约2.5倍;锦绣谷河流域如琴湖大坝区域k_(sn)出现异常峰值,达269.44 m 0.9,较流域其他河段高约5.45倍,据此可精确标定两处具体袭夺点。本研究构建的χ-k_(sn)值综合分析方法框架为快速解译复杂水系演化过程提供了可推广的量化工具,对深化构造-地貌-气候耦合机制研究具有重要方法论价值。展开更多
The existing literature discussed only the aerial aspect and provided a brief description of tectonic-geomorphic correlation with field evidence.In present study we applied power law equations to estimate basin asymme...The existing literature discussed only the aerial aspect and provided a brief description of tectonic-geomorphic correlation with field evidence.In present study we applied power law equations to estimate basin asymmetry factor(AF),Transverse topographic asymmetric factor(T),Hypsometric Integral(HI),longitudinal profile,stream length gradient index(SL),steepness index(Ksn),Chi(χ),and knick point(Kp)analysis to examine the response of tectono-climatic fluctuations in the Mandakini River basin,central Uttarakhand Himalaya.To decouple the causative tectono-climatic factors,we employed geospatial and Stream Power Incision Modeling(SPIM)techniques.SPIM is a globally accepted tool to predict an equilibrium state between fluvial erosion rates and the escalating function of stream power.It is actively applied in modeling the transformation of river systems especially in rugged topographic regions.The present study covers SPIM-based morphometric assessment of the tectonically sensitive Mandakini River basin between Ramgarh Thrust(RT)and Vaikrita Thrust(VT)in the central region of Uttarakhand Himalaya.In the upper reaches of the basin,U-shaped glaciated valleys dominate the landscape,while a rolling topography and deeply incised narrow valleys are depicted towards the downstream.Therefore,to understand the response of active tectonic over geomorphology,the drainage basin has been divided into two separate zones from the confluence point near the Rampur area.The modeling outcomes indicate that the Mandakini drainage basin is in a disequilibrium state where channels are actively incising to bedrock.Overall,AF of 32 and 70 indicate leftward tilting in the upper reaches and rightward tilting in the lower reaches of the basin,respectively.The HI value of 0.38 indicates a stage of maturity,characterized by a concave shape profile.Based on the analysis it may be concluded that the fragile lithology and tectono-climatic fluctuations are dominantly controlling the topography and valley floor morphology of the Mandakini River.展开更多
文摘Single Phase Induction Motor(SPIM)is widely used in industries at starting stage to provide high starting torque.The objective of the work is to develop a drive for Single Phase Induction Motor that does not use a start or run capacitor.In this work,the researchers present the details about Maximum Power Point Tracking using series-compensated Buck Boost Converter,resonant Direct Current(DC)to Alternate Current(AC)inverter and matrix converter-based drive.The proposed method provides a variable starting torque feature that can be adjusted depending upon machine load to ensure Power Quality(PQ).The system uses Series Compensated Buck Boost Converter(SCBBC)to derive the power from solar source and a Partial Resonant Inverter(PRI)between the Matrix Converter(MC)and DC link battery to reduce the switching loss.The application of Space Vector Pulse Width Modulation(SVPWM)ensures the improvement of power quality at driving terminals of SPIM.The proposed system has been math-ematically modelled and simulated in MATLAB SIMULINK environment and was validated using standardized experimental verification.
文摘河流袭夺现象是揭示构造-气候-地表过程耦合效应的关键地貌过程。传统研究方法依赖高成本的野外勘查与实验分析,成本高、周期长,亟需发展高效的识别技术。江西庐山处于长江中游典型构造-气候耦合作用活跃区,其密集的水网系统频繁受控于构造运动与侵蚀基准面变化,为河流袭夺现象的研究提供了丰富的样本空间。本研究基于12.5 m分辨率DEM数据,集成水力侵蚀模型(Stream-Power Incision Model,SPIM)的衍生参数——河道面积积分χ值与河道陡峭指数k_(sn),构建χ-k_(sn)参数值综合分析河流袭夺的识别方法,对江西庐山大校场、锦绣谷两个典型流域内的河流袭夺现象开展验证,评估该方法在复杂地貌背景下的适用性与识别效率。研究结果表明:(1)运用χ-k_(sn)值进行河流袭夺现象快速识别,该方法具有高效性与可靠性,成果与区域地质记录及历史水文记录高度吻合。(2)在技术操作上,选用0.45作为参考凹度值时,χ-k_(sn)值分析可显著提升河流网络识别灵敏度,其生成的高程-面积关系(χ-plot)图呈现更优的对称性、更清晰的凸型轮廓特征,且相较其他值图像离散度可降低约28.57%,更契合庐山陡峭山地河流的袭夺判别需求。(3)对庐山两个典型流域进行案例验证发现:根据χ值分析,大校场流域内大校场河与长冲河中下游段、锦绣谷流域内西谷河上游与锦绣谷河干流2处χ值差异相较流域其他区域更高,据此在两流域各锁定1处可疑袭夺区;陡峭指数k_(sn)分析进一步揭示,大校场河流域芦林湖大坝附近河段k_(sn)异常峰值,达92.92 m 0.9,较流域其他河段均值高约2.5倍;锦绣谷河流域如琴湖大坝区域k_(sn)出现异常峰值,达269.44 m 0.9,较流域其他河段高约5.45倍,据此可精确标定两处具体袭夺点。本研究构建的χ-k_(sn)值综合分析方法框架为快速解译复杂水系演化过程提供了可推广的量化工具,对深化构造-地貌-气候耦合机制研究具有重要方法论价值。
基金The authors are thankful to the UPES,Dehradun and the Department of Science and Technology,Govt of India(Project:CRG/2023/000555)for supporting this study.
文摘The existing literature discussed only the aerial aspect and provided a brief description of tectonic-geomorphic correlation with field evidence.In present study we applied power law equations to estimate basin asymmetry factor(AF),Transverse topographic asymmetric factor(T),Hypsometric Integral(HI),longitudinal profile,stream length gradient index(SL),steepness index(Ksn),Chi(χ),and knick point(Kp)analysis to examine the response of tectono-climatic fluctuations in the Mandakini River basin,central Uttarakhand Himalaya.To decouple the causative tectono-climatic factors,we employed geospatial and Stream Power Incision Modeling(SPIM)techniques.SPIM is a globally accepted tool to predict an equilibrium state between fluvial erosion rates and the escalating function of stream power.It is actively applied in modeling the transformation of river systems especially in rugged topographic regions.The present study covers SPIM-based morphometric assessment of the tectonically sensitive Mandakini River basin between Ramgarh Thrust(RT)and Vaikrita Thrust(VT)in the central region of Uttarakhand Himalaya.In the upper reaches of the basin,U-shaped glaciated valleys dominate the landscape,while a rolling topography and deeply incised narrow valleys are depicted towards the downstream.Therefore,to understand the response of active tectonic over geomorphology,the drainage basin has been divided into two separate zones from the confluence point near the Rampur area.The modeling outcomes indicate that the Mandakini drainage basin is in a disequilibrium state where channels are actively incising to bedrock.Overall,AF of 32 and 70 indicate leftward tilting in the upper reaches and rightward tilting in the lower reaches of the basin,respectively.The HI value of 0.38 indicates a stage of maturity,characterized by a concave shape profile.Based on the analysis it may be concluded that the fragile lithology and tectono-climatic fluctuations are dominantly controlling the topography and valley floor morphology of the Mandakini River.
