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A low noise charge sensitive preamplifier with switch control feedback resistance

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Nuclear Science and Techniques 2008年第1期19卷 39-44页

作者： wembe tafo evariste SU Hong PENG Yu WU Ming QIAN Yi Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Physics University of Douala Cameroon

In this paper, the design and analysis of a new low noise charge sensitive preamplifier for silicon strip, Si(Li), CdZnTe and CsI detectors etc. with switch control feedback resistance were described, the entire system to be built using the CMOS transistors. The circuit configuration of the CSP proposed in this paper can be adopted to develop CMOS-based Application Specific Integrated Circuit further for Front End Electronics of read-out system of nuclear physics, particle physics and astrophysics research, etc. This work is an implemented design that we succeed after a simulation to obtain a rise time less than 3ns, the output resistance less than 94? and the linearity almost good.

关键词：电流放大器粒子探测技术开关反射电阻

Design and simulation of Gaussian shaping amplifier made only with CMOS FET for FEE of particle detector

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Nuclear Science and Techniques 2010年第5期21卷 312-315页

作者： wembe tafo evariste SU Hong QIAN Yi KONG Jie WANG Tongxi Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Physics University of Douala Cameroon

The objective of this paper is to design and simulate a shaping amplifier circuit for silicon strip,Si(Li),CdZnTe and CsI detectors,etc.,which can be further integrated the whole system and adopted to develop CMOS-based application,specific integrated circuit for Front End Electronics(FEE) of read-out system of nuclear physics,particle physics and astrophysics research,***'s why we used only CMOS transistor to develop the entire system.A Pseudo-Gaussian shaping amplifier made by fourth-order integration stage and a differentiation stage give a result same as a true CR-RC4 filter,we perform shaping time in the range,465 ns to 2.76μs with a low output resistance and the linearity almost good.

关键词： MOS场效应管探测器放大器设计高斯 CMOS晶体管颗粒成型

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基于DMOS管的电荷灵敏前置放大器设计

核电子学与探测技术 2010年第1期30卷 67-70页

作者：高艳妮苏弘 wembe tafo evariste 中国科学院近代物理研究所甘肃兰州730000 中国科学院研究生院北京100049 杜阿拉大学物理学院

提出了一种由DMOS场效应管构成的电荷灵敏前置放大器,可用于硅,Si(Li),CdZnTe及CsI探测器。该前置放大器采用不同于传统的阻容反馈式的电路结构,完全使用MOS管搭建,该前放的设计完成为设计实现ASIC电路准备了技术基础。由Multisi m仿真... 详细信息

提出了一种由DMOS场效应管构成的电荷灵敏前置放大器,可用于硅,Si(Li),CdZnTe及CsI探测器。该前置放大器采用不同于传统的阻容反馈式的电路结构,完全使用MOS管搭建,该前放的设计完成为设计实现ASIC电路准备了技术基础。由Multisi m仿真结果看出该电荷灵敏前置放大器输出信号上升时间小于15ns,并且具有很好的稳定性。

关键词： DMOS 电荷灵敏前置放大器设计仿真

用于粒子探测器的CMOS FET采样保持电路的设计与仿真(英文)

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原子核物理评论 2010年第4期27卷 459-463页

作者： wembe tafo evariste 苏弘千奕周朝阳王同喜中国科学院近代物理研究所甘肃兰州730000 杜阿拉大学物理系

介绍了一个峰保持电路。该电路适用于silicon strip,Si(Li),CdZn Te and CsI等探测器,实现采样-保持功能。已成功进行了基于CMOSFET的采样-保持电路的设计和仿真,通过使用Proteus的PSPICE仿真器和BSIMV3.3模型参数完成了电路性能的仿真... 详细信息

介绍了一个峰保持电路。该电路适用于silicon strip,Si(Li),CdZn Te and CsI等探测器,实现采样-保持功能。已成功进行了基于CMOSFET的采样-保持电路的设计和仿真,通过使用Proteus的PSPICE仿真器和BSIMV3.3模型参数完成了电路性能的仿真。同时,实现了采样时间可在60ns到4.44s范围内进行选择,该电路具有较好的线性。

关键词：采样保持 CMOS场效应管峰值仿真

Deposition of Zn(Mn,Mo)-Ni-Co Ternary Transition Metal Sulfides and Reduced Graphene Oxide on Ni Foam as Electrode Materials for Asymmetric Supercapacitors

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Deposition of Zn(Mn,Mo)-Ni-Co Ternary Transition Metal Sulfi...

作者： UMAMAHORO evariste 浙江理工大学

学位级别：硕士

Recently,supercapacitors have drawn great attention because of their high charge/discharge rate,long life cycle,and outstanding power ***,also known as ultra-capacitors or electrochemical capacitors,can store electrical energy faradaically（pseudocapacitor）and electrostatically（electrical double layers）.Pseudo-capacitor materials offer much higher specific capacitance and energy density than electrical double layers（EDLCs）via reversible faradaic redox ***,currently,one major challenge that keeps supercapacitors from their promising applications is their low energy *** objective of this thesis research is to develop supercapacitors with simultaneously high power density and energy *** transition metal oxides and transition metal sulfides（TMSs）as pseudo-capacitors are promising electrode materials for supercapacitors owing to their superior electrochemical *** sulfides have attracted significant research interest for their high specific capacitance,environmental friendliness,chemical and thermal stability,and much higher electrical conductivity than their metal oxides *** metal sulfides can offer better electrochemical performance than bimetal sulfides or single component metal sulfides by using all 3 metal ions in the redox *** on these considerations,the ternary metal sulfides have been synthesized,characterized,their electrochemical performances tested and used to assemble the asymmetric supercapacitors as follow:Hierarchical mesoporous Zn-Ni-Co-S-rGO/NF（nickel foam）microspheres have been prepared by hydrothermal,sulfurization,and calcination *** effect of different sulfurization time on the morphology and capacitance of composites was *** high electrochemical performance of（Zn-Ni-Co-S-rGO/NF）composite was obtained when the sulfurization time was 3 h（Zn-Ni-Co-S-rGO/NF-3h）,where a specific capacitance of 627.7 F g-1 at 0.25 A g-1 and excellent rate capability of

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Realization of non-equilibrium process for high thermoelectric performance Sb-doped Ge Te

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Science Bulletin 2018年第11期63卷 717-725页

作者： evariste Nshimyimana Xianli Su Hongyao Xie Wei Liu Rigui Deng Tingting Luo Yonggao Yan Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Pristine GeTe shows inferior thermoelectric performance around unit due to the large carrier concentration induced by the presence of intrinsic high concentration of Ge vacancy. In this study, we report a thermoelectric figure of merit ZT of 1.56 at 700 K, realized in Sb-doped GeTe based thermoelectric(TE)materials via combined effect of suppression of intrinsic Ge vacancy and Sb doping. The nonequilibrium nature during melt spinning process plays very important role. For one thing, it promotes the homogeneity in Ge_(1-x)Sb_xTe samples and refines the grain size of the product. Moreover the persistent Ge precipitated as impurity phase in the traditional synthesis process is found to be dissolved back into the GeTe sublattice, accompanying with a drastic suppression of Ge vacancies concentration which in combination with Sb electron doping significantly reduced the inherent carrier concentration in *** carrier concentration, approaching the optimum carrier concentration ～3.74 × 10^(-20) cm^(-3) and a high power factor of 4.01 × 10^(-3) W m^(-1)K^(-2) at 750 K are achieved for Ge_(0.98)Sb_(0.02) Te sample. In addition,the enhanced grain boundary phonon scattering by refining the grain size through melt spinning(MS)process, coupled with the intensified alloying phonon scattering via Sb doping leads to low thermal conductivity of 1.53 W m^(-1) K^(-1) at 700 K for Ge_(0.94) Sb_(0.06) Te sample. All those contribute to a high ZT value,representing over 50% improvement in the ZT value compared to the Sb free samples, which provides an alternative way for ultrafast synthesis of high performance GeTe based thermoelectric material.

关键词： GeTe Sb doping MS-SPS process Thermoelectric properties

Early dynamics of transmission and projections of COVID-19 in some West African countries

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Infectious Disease Modelling 2020年第1期5卷 839-847页

作者： Jules-Clement Assob-Nguedia David Dongo Pierre evariste Nguimkeu Faculty of Medicine and Pharmaceutical Sciences University of DoualaCameroon Department of Mathematics&Computer Sciences Faculty of ScienceUniversity of DschangCameroon Department of Economics Andrew Young School of Policy StudiesGeorgia State UniversityUSA

The initial cases of novel coronavirus(COVID-19)were identified in most West African countries between late February and early March of *** it is only after March 15,2020 that the number of cases started rising significantly in these *** study analyzes the transmission dynamics of the outbreak in West Africa nearly 5 months after the effective *** focus on Cameroon,Ghana,Guinea and Nigeria,which are the four West African countries with the highest numbers of infected *** combine models of mathematical epidemiology and publicly available data to estimate the main disease transmission *** particular,we estimate the initial doubling time,the peak time,the peak rate,the final size and the short-term transmission forecasts of the COVID-19 epidemic for these *** implications for the effectiveness of control measures and for assessing the potential impact on public health in West Africa are discussed.

关键词： dynamics doubling COV

Traditional Lowlands Water Management in Dano, South-Western Burkina Faso

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Journal of Water Resource and Protection 2016年第4期8卷 425-434页

作者： Sié Pale Dapola evariste Constant DA Polytechnic University Center of Ouahigouya/Department of Atmosphere Sciences University Ouaga I Pr Joseph KI-ZERBO/Department of geography

Lowland water resources management represents a challenge of the future that calls any community. Irrigated crops are grown in some areas of Burkina Faso, others are limited by a lack of irrigation infrastructure. Due to limited crop irrigation, crops and the associated populations dependent on them, depend on rain and on climatic factors. Thus, there is a need to understand and implement traditional mechanisms for managing lowland water in Dano, where climatic and geological conditions provide a sustained source of water. Here, I use a literature review combined with field work and interviews/questionnaires to estimate the potential exploitable plains to 16,056 ha or 24% of the communal area. Management mechanisms and traditional operating systems of lowland waters were clear, which helped to set the technological level of farmers, in partial control of water management.

关键词： Burkina Faso Dano South Sudanese Climate Lowlands Traditional Management

Ramsay Hunt Syndrome Revealing HIV Conditions

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International Journal of Otolaryngology and Head & Neck Surgery 2022年第3期11卷 112-118页

作者： Ghislaine Neuilly Ngniee tafo Fatogoma Issa Kone Boubacar Maiga Mohamed Keita Reference Health Center I in Bamako Bamako Mali University Hospital of Gabriel Touré of Bamako (CHU) Bamako Mali

Objective: To discuss the diagnostic, therapeutic, and evolutionary aspects of a case of herpes zoster oticus associated with facial palsy in HIV conditions. Case Study: We report the case of a 32-year-old married female beautician patient admitted with severe right otalgia associated with a fever that had been evolving for three days. The addition of homolateral otorrhea and headache was noted. The initial examination on admission noted a vesicular rash of the pinna and the external third of the right external auditory canal with a normal tympanic membrane. The evolution was marked 48 hours later by the appearance of a right facial palsy grade V. The CT scan of the rock showed a mastoid and maxillary sinus hypodensity. The paraclinical exploration found a positive retroviral serology to HIV 1 and 2. The diagnosis retained was a Ramsay Hunt syndrome on HIV condition associated with ipsilateral maxillary sinusitis and mastoiditis. The treatment administered was a combination of amoxicillin/clavulanic acid injection of 3 g per day + oral aciclovir 200 mg, acetaminophen 1 g injectable every 6 h, betamethasone 4mg per day, vitamin B complex, artificial tear. Therapeutic inclusion in the HIV/AIDS national program was performed. The evolution was marked by the total regression of the facial palsy after six months of treatment. Conclusion: Otogenic diseases in HIV remain a problem in our context where the circumstances of discovery are most often fortuitous, hence the need to search for the serological status in front of any suspicion of viral infection in adults. The status may constitute a triggering factor or a factor of the severity of the pathology or of the symptoms such as facial palsy or deafness in our case. Early and adapted management has been shown to improve the prognosis.

关键词： RAMSAY HUNT Syndrome Zona Ear Facial Paralysis HIV