A potential energy framework for assessment of grid vulnerability was presented.In the framework,the branch potential energy function model was constructed.Two indexes,current vulnerability and forecasting vulnerabili...A potential energy framework for assessment of grid vulnerability was presented.In the framework,the branch potential energy function model was constructed.Two indexes,current vulnerability and forecasting vulnerability,were calculated.The current vulnerability was used to identify the current vulnerable area through calculating the distance between the current transmitted power and initial transmitted power;and the forecast vulnerability under variation of power injection was used to predict the vulnerable area of next step and verify the current vulnerable area.Numerical simulation was performed under variant operating conditions with IEEE-30 bus system,which shows that almost area of 90% overlaps between current vulnerable area and forecasting vulnerable area,the overlapped area is termed as inherent vulnerable area of grid.When considering N-1 contingency,the assessment results of this method proposed agree with those of optimal power flow.When considering N-2 contingency,optimal power flow fails to obtain correct results,while the method based on energy framework gives reliable results.展开更多
The current paper focuses on the prediction of residual stresses and distortions in the Laser Powder Bed Fusion(LPBF)built Ti6Al4V thin-walled geometries using Ansys Additive Print(AAP)software which employs a layer-b...The current paper focuses on the prediction of residual stresses and distortions in the Laser Powder Bed Fusion(LPBF)built Ti6Al4V thin-walled geometries using Ansys Additive Print(AAP)software which employs a layer-by-layer accumulation of inherent strain to calculate the deformations.Isotropic and anisotropic strain scaling factors were calibrated initially within the APP software for the Ti6Al4V based single cantilever beam geometry.Subsequently,the numerical simulations were performed in APP software and computed the residual stresses and distortions for the varied process parameters including laser power,scan speed and hatch distance while maintaining the layer thickness constant for all the design iterations.The numerical predictions were compared;they were found to match reasonably well with the XRD measurements within the calibrated regime.展开更多
Point-of-care(POC)testing offers rapid results of diagnostics near the site of patient care,which can significantly improve health care and management of infectious diseases.POC testing now plays a crucial role in hea...Point-of-care(POC)testing offers rapid results of diagnostics near the site of patient care,which can significantly improve health care and management of infectious diseases.POC testing now plays a crucial role in healthcare delivery of both developed and developing countries,particularly in developing countries where medical resources are limited.Challenges remain for the biomedical engineering community to develop truly portable,automatic,low-cost and easyto-use POC tools.Blood tests are the most commonly-used diagnostic methods nowadays because blood analyses provide definitive information of medical conditions of patients.Traditional blood tests,including sample collection,preparation and detection,are conducted using large-scale blood an-展开更多
06001 Technical Requirements for VCXO used inthe Cesium Atomic Clock. Zheng Lisheng: 1(4), 1980.pp.316--320.Voltage controlled crystal oscillator (VCXO) plays an im-portant roll in the atomic frequency standard. Thepe...06001 Technical Requirements for VCXO used inthe Cesium Atomic Clock. Zheng Lisheng: 1(4), 1980.pp.316--320.Voltage controlled crystal oscillator (VCXO) plays an im-portant roll in the atomic frequency standard. Theperformance of VCXO must be excellent so as to main-展开更多
基金Project(51007006) supported by the National Natural Science Foundation of ChinaProject(20090185120023) supported by the Ph.D Programs Foundation for New Teacher of Ministry of Education of China
文摘A potential energy framework for assessment of grid vulnerability was presented.In the framework,the branch potential energy function model was constructed.Two indexes,current vulnerability and forecasting vulnerability,were calculated.The current vulnerability was used to identify the current vulnerable area through calculating the distance between the current transmitted power and initial transmitted power;and the forecast vulnerability under variation of power injection was used to predict the vulnerable area of next step and verify the current vulnerable area.Numerical simulation was performed under variant operating conditions with IEEE-30 bus system,which shows that almost area of 90% overlaps between current vulnerable area and forecasting vulnerable area,the overlapped area is termed as inherent vulnerable area of grid.When considering N-1 contingency,the assessment results of this method proposed agree with those of optimal power flow.When considering N-2 contingency,optimal power flow fails to obtain correct results,while the method based on energy framework gives reliable results.
文摘The current paper focuses on the prediction of residual stresses and distortions in the Laser Powder Bed Fusion(LPBF)built Ti6Al4V thin-walled geometries using Ansys Additive Print(AAP)software which employs a layer-by-layer accumulation of inherent strain to calculate the deformations.Isotropic and anisotropic strain scaling factors were calibrated initially within the APP software for the Ti6Al4V based single cantilever beam geometry.Subsequently,the numerical simulations were performed in APP software and computed the residual stresses and distortions for the varied process parameters including laser power,scan speed and hatch distance while maintaining the layer thickness constant for all the design iterations.The numerical predictions were compared;they were found to match reasonably well with the XRD measurements within the calibrated regime.
基金the financial support from Natural Science and Engineering Research Council of Canada(NSERC)
文摘Point-of-care(POC)testing offers rapid results of diagnostics near the site of patient care,which can significantly improve health care and management of infectious diseases.POC testing now plays a crucial role in healthcare delivery of both developed and developing countries,particularly in developing countries where medical resources are limited.Challenges remain for the biomedical engineering community to develop truly portable,automatic,low-cost and easyto-use POC tools.Blood tests are the most commonly-used diagnostic methods nowadays because blood analyses provide definitive information of medical conditions of patients.Traditional blood tests,including sample collection,preparation and detection,are conducted using large-scale blood an-
文摘06001 Technical Requirements for VCXO used inthe Cesium Atomic Clock. Zheng Lisheng: 1(4), 1980.pp.316--320.Voltage controlled crystal oscillator (VCXO) plays an im-portant roll in the atomic frequency standard. Theperformance of VCXO must be excellent so as to main-
