针对全并联自耦变压器(auto-transformer,AT)牵引网故障点反射波波头微弱难辨识,且线路并联结构导致故障行波折反射复杂而造成定位困难的问题,提出基于变分模态分解(variational mode decomposition,VMD)和改进能量算子的牵引网故障行波单端定位方法。首先,深入分析牵引网故障行波的传输特性,研究全并联结构对行波折反射的影响,确定不同故障类型和潮流特征,以此为依据提取故障特征量,将波头辨识转化为能量突变值提取;随后,利用VMD去噪提取电压行波真实分量,再针对第二反射波波头微弱难标定问题,在滑动时间窗口(sliding time window,STW)下,结合对称差分能量算子(symmetrical differencing energy operator,SDEO)构造故障信号的二次瞬时能量谱,效果良好。仿真结果表明:所提方法抗过渡电阻能力强,能够反应不同工况下故障牵引网电磁能量的变化,具有较高的定位精度。
Introduction: Invasive cancers of the vulva are uncommon;it is a pathology of the elderly. More and more young women are concerned. Objectives: To study and analyze vulvar cancer in our context. Patients and Method: Retrospective, descriptive and analytical study carried out in the Gynecology Department of the Owendo University Hospital over a period of 5 years from 2020 to 2024. All cancer cases of the period were concerned and we included vulvar cancers. We studied the epidemiological, clinical and therapeutic aspects. Results: We collected 5 files, the median age was 41.8 years [30 - 57 years], the average consultation time was 18 months [12 - 36 months]. Ulcerated, budding, and itchy lesions were present in 80% of cases. Invasive squamous cell carcinoma was the histological type present in all patients. Surgery was performed in 40% of cases. Concomitant radiochemotherapy (CRC) was offered in all patients. HIV was the comorbidity found in 100% of cases. Conclusion: Vulvar cancers are rare. They are often seen at advanced stages because of their location, the taboo nature they represent on the one hand and underdiagnosis on the other.
Sima Ole BonifaceMadi Tigani GuiremaMba Edou Sidi GérardEdou Bekale Guy PatrickOgandaga EtienneBang Ntamack JaquesMayi Tsonga SosthèneMeye Jean François
温室环境的精准调控对于提高作物产量与品质具有极为关键的意义。温室气体浓度和光照强度是两个核心的环境参数。AT 80 C 51单片机通过连接气体浓度传感器与光照强度传感器,对采集到的温室气体浓度和光照强度数据进行快速处理与分析,并根据作物的实际需求,对温室气体浓度及光照强度进行自动调节,从而保证温室作物的最佳生长环境。
High-pressure synthesis of lutetium hydrides from molecular hydrogen(H_(2))and lutetium(Lu)is systematically investigated using synchrotron X-ray diffraction,Raman spectroscopy,and visual observations.We demonstrate that the reaction pathway between H_(2)and Lu invariably follows the sequence Lu→LuH_(2)→LuH_(3)and exhibits a notable time dependence.A comprehensive diagram representing the formation and synthesis of lutetium hydrides as a function of pressure and time is constructed.Our findings indicate that the synthesis can be accelerated by elevated temperature and decelerated by increased pressure.Notably,two critical pressure thresholds at ambient temperature are identified:the synthesis of LuH_(2)from Lu commences at a minimum pressure of~3 GPa,while~28 GPa is the minimum pressure at which LuH_(2)fails to transform into LuH_(3)within a time scale of months.This underscores the significant impact of temporal factors on synthesis,with the reaction completion time increasing sub-linearly with rising pressure.Furthermore,the cubic phase of LuH_(3)can be obtained exclusively through compressing the trigonal LuH_(3)phase at~11.5 GPa.We also demonstrate that the bandgap of LuH_(3)slowly closes under pressure and is noticeably lower than that of LuH_(2).
