简介：令G=（V（G），V（G））是一个简单图，Mp（G）为图G广义Mycielski图。图G的L（2，1）标号数，记作λ（G），定义为λ（G）=min{k｜G有一个k-L（2，1）标号}。n个顶点的路、圈分别记作Pn，Cn。给出了路和圈的广义Mycielski图的L（2，1）标号数λ（Mp（Pn））和λ（Mp（Cn））。

简介：研究了L0-范数最小化问题的计算方法。提出了基于熵函数的求解L0-范数最小化问题的光滑化方法，通过熵函数将L0-范数最小化问题转化为光滑函数的最优化问题。针对光滑函数的选取，提出了求解L0-范数最小化问题的算法，并证明了算法的收敛性。

简介：AnexclusiveinterviewwiththeauthorwaspublishedinIssue2,2010ofthisjournal,inwhichthestartingpointandmacro-strategytoconstructsmartgridinChinawaspresented.Meanwhile,thethreeperiodsofsmartgridconstructionwerealsomentioned,namelyplanningandpilotprojectconstructionperiod,overallconstructionperiod,andimprovingandupgradingperiodasitisplannedbySGCC.Attheinvitationofthisjournal,theauthorwroteanarticlefurtherintroducingtheimplementationinthefirstperiodofSGCCsmartgridprogram.Thearticlewillbepublishedintwoconsecutiveissues.

简介：Ｐｏｗｅｒｒｅｌｉａｂｉｌｉｔｙｐｒｏｍｏｔｅｄｉｎ１ｓｔｈａｌｆｏｆ１９９７Ｆｒｏｍｔｈｅｓｔａｔｉｓｔｉｃｓｏｆ２７ｍｕｎｉｃｉｐａｌｉｔｉｅｓａｎｄｐｒｏｖｉｎｃｉａｌｃａｐｉｔａｌｓｃｏｌｌｅｃｔｅｄｂｙｔｈｅＰｏｗｅｒＲｅｌｉａｂｉｌｉｔｙ...

简介：Helicopterinspectionofultrahighvoltage(UHV)transmissionlineshasunmatchedadvantagescomparedtomanualworkduetotheinspectionangleandhigh-techequipmentonboard,especiallyindetailedinspectionsoftowerheadsanddefect-detectionsinvirtueofinfrared/ultraviolettechniques.Thispaperdealswithsomekeytechnicalproblemsintheinspectionsof1000kVUHVAClineswithahelicopter,suchasthesafedistanceoflive-lineworking,electromagneticfieldintensityandflightcontrol.Basedonthestudyresults,asetofUHVlineinspectionmethodswasworkedoutandappliedtotheinspectionofliveUHVlines.

简介：

简介：Co-hostedbyChinaSocietyforHydropowerEngineeringandChinaThreeGorgesProjectCorporation,co-organizedbyChinaHydropowerEngineeringConsultingGroupCorporation,SINOHYDROCorporation,ChinaGezhouba(Group)CorporationandChinaInstituteofWaterResourcesandHydropowerResearch,organizedbyChinaElectricPowerInformationCenterBeijingZhongdianqiuzhenT&DCo.,Ltd.,supportedbyStateElectricityRegulatoryCommissionofChina,StateGridCorporationofChina,ChinaSouthernPowerGridCo.,Ltd.,ChinaHuaneng

简介：

简介：研究了轧制Mg-3Al-1Zn合金的动态再结晶组织、晶粒尺寸、织构分布和力学性能。结果表明，晶粒尺寸、晶粒大小均匀程度、再结晶组织份数及织构分布共同影响合金的力学性能。晶粒尺寸和织构类型相同时，形变组织份数越高，屈服强度越高；细小晶粒和均匀的晶粒分布易于获得高延伸率；{0002}基面织构对轧制合金屈服强度的各向异性有显著影响。