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Geochemical constraints on the origin and tectonic setting of the serpentinized peridotites from the Paleoproterozoic Nyong series,Eseka area,SW Cameroon

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Acta Geochimica 2020年第3期39卷 404-422页

作者： Philomene Nga Essomba Tsoungui Sylvestre Ganno Evine Laure Tanko Njiosseu Jean Lavenir Ndema Mbongue Brice Kamguia Woguia landry Soh Tamehe Jonas Didero Takodjou Wambo Jean Paul Nzenti Department of Earth Sciences University of Yaounde IP.O.Box 3412MessaYaoundeCameroon Department of Earth Sciences University of DschangP.O.Box.67DschangCameroon Key Laboratory of CBM Resources and Reservoir Formation Process Chinese Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina

Serpentinized rocks closely associated with Paleoproterozoic eclogitic metabasites were recently discovered at Eseka area in the northwestern edge of the Congo craton in southern ***,we present new field data,petrography,and first comprehensible wholerock geochemistry data and discuss the protolith and tectonic significance of these serpentinites in the *** studied rock samples are characterized by pseudomorphic textures,including mesh microstructure formed by serpentine intergrowths with cores of olivine,bastites after *** constitutes almost the whole bulk of the rocks and is associated(to the less amount)with tremolite,talc,spinel,and ***-rock chemistry of the Eseka serpentinites led to the distinction of two *** 1 has high MgO(>40 wt%)content and high Mg#values(88.80)whereas Type 2 serpentinite samples display relatively low MgO concentration and Mg#values(50 ppm).This similarity,associated with the high Cr contents,spinel-peridotite protolith compositions and Mg/Si and Al/Si ratios imply that the studied serpentinites were formed in a subductionrelated *** U-shaped chondrite normalizedREE patterns of serpentinized peridotites,coupled with similar enrichments in LREE and HFSE,suggest the refertilized nature due to melt/rock interaction prior to *** on the results,we suggest that the Eseka serpentinized peridotites are mantle residues that suffered a high degree of partial melting in a subductionrelated environment,especially in Supra Subduction Zone *** new findings suggest that the Nyong series in Cameroon rep

关键词： Serpentinites Mantle peridotites Melt/rock interaction Paleoproterozoic suture zone Eseka area Nyong series Congo/Sao Francisco cratons

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Long latency of evoked quantal transmitter release from somata of locus coeruleus neurons in rat pontine slices

Long latency of evoked quantal transmitter release from soma...

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第十次中国生物物理学术大会

作者： Marc landry Hokfelt T INSERM E358 Institut Francois MagendieUniversite Victor Segaleux Bordeaux 233077 BordeauxFrance Department of Neuroscience Karolinska Institute5-777 71StockholmSweden

＜正＞Locus coeruleus （LC） harbours a compact group of noradrenergic cell bodies projecting to virtually all parts of the central nervous system （CNS）. This system has been implicated in a wide range of behavioral and physiological processes, including the sleep-wake cycle, cardiovascular regulation and mood as well as attention and learning. However, exact

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耦合反应器中化学链燃烧的模拟

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工程热物理学报 2014年第7期35卷 1361-1364页

作者： M'BOUNANA Noé-landry-Privace 王帅杨运超 CAMARA Namory 陆慧林哈尔滨工业大学能源科学与工程学院哈尔滨150001

基于颗粒动理学和化学动力学理论,建立化学链燃烧计算模型,数值模拟了耦合反应器内化学链燃烧过程,获得了反应器内流场特性和各组分分布规律,并很好地捕捉到了空气反应器中颗粒呈现出的非均匀环核流动结构。模拟结果同时给出了反应器中... 详细信息

基于颗粒动理学和化学动力学理论,建立化学链燃烧计算模型,数值模拟了耦合反应器内化学链燃烧过程,获得了反应器内流场特性和各组分分布规律,并很好地捕捉到了空气反应器中颗粒呈现出的非均匀环核流动结构。模拟结果同时给出了反应器中温度分布规律以及各出口颗粒质量流率和各组分浓度随时间的变化,为耦合反应器的设计优化提供了一定的依据。

关键词：耦合反应器化学链燃烧数值模拟

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New Strategy of Collaborative Acquisition for Connected GNSS Receivers in Deep Urban Environments

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Positioning 2018年第3期9卷 23-46页

作者： Maherizo Andrianarison Mohamed Sahmoudi René Jr. landry LASSENA Laboratory Ecole de Technologie Supérieure Montreal Canada ISAE-SUPAERO & TESA University of Toulouse Toulouse France

Collaborative Positioning (CP) is a better localization technique used to locate a user in challenged environments, which is driven by the increasing presence of cellular phones and mobile devices in urban areas. The basic idea is that the mobile devices can cooperate with each other to improve their ability to determine their position. In this concept, a network of GNSS (Global Navigation Satellite System) receivers can collectively receive available satellite signals, and each receiver can receive signal measurements from other receivers via a communication link. This work shows how to use the Collective Detection (CD) approach to deal with the concept of collaborative or cooperative positioning. Specifically, this paper develops a new strategy allowing a receiver in deep urban environment to locate using the CD approach, while overcoming the implementation complexity problem. The idea consists in applying the CD approach in the case of multiple GNSS receivers to assist a receiver in a difficult situation. A typical case of two connected receivers assisting a receiver in difficulty in a deep urban area shows the effectiveness of this strategy. This strategy is tested with real GNSS signals to analyze its feasibility. The overall gain in complexity can reach up to 46% of what has been achieved in previous works.

关键词： Collective Detection Collaborative Positioning Connected GNSS Receivers Deep Urban Environments

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Acquisition of Weak Signals in Multi-Constellation Frequency Domain Receivers

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Positioning 2013年第2期4卷 144-152页

作者： Kaveh Mollaiyan Rock Santerre René Jr. landry Department of Electrical Engineering école de Technologie Supérieure Montreal Canada Department of Geomatics Sciences Université Laval Quebec Canada Department of Electrical Engineering école de Technologie Supérieure Montreal Canada

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, since it benefits from parallel processing capabilities of Fast Fourier Transform (FFT), which can be efficiently implemented in software receivers. On the other hand, long coherent integration times are mainly limited due to large FFT size in receivers using frequency domain techniques. A new method is proposed to address the problems in frequency domain receivers without compromising the resources and execution time. A pre-correlation accumulation (PCA) is proposed to partition the received samples into one-code-period blocks, and to sum them together. As a result, the noise is averaged out and the correlation results will gain more power, provided that the relative phase between the data segments is compensated for. In addition to simplicity, the proposed PCA method enables the use of one-size FFT for all integration times. A post-correlation peak combination is also proposed to remove the need for double buffering. The proposed methods are implemented in a configurable Simulink model, developed for acquiring recorded GNSS signals. For weak signal scenarios, a Spirent GPS simulator is used as a source. Acquisition results for GPS L1 C/A and GLONASS L1OF are shown and the performance of the proposed technique is discussed. The proposed techniques target GNSS receivers using frequency domain processing aiming at accommodating all the GNSS signals, while minimizing resource usage. They also apply to weak signal acquisition in frequency domain to answer the availability demand of today’s GNSS positioning applications.

关键词： FFT Acquisition Frequency Domain Receiver Weak Signal Multi-Constellation

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旋涡流化床中气固两相流体动力特性的数值模拟

旋涡流化床中气固两相流体动力特性的数值模拟

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作者： M’BOUANA Noé-landry-Privace 哈尔滨工业大学

学位级别：硕士

流化床反应器广泛应用于包括燃烧、聚合的化工和生物质化学过程。为增强流化床反应器的效率,需要增加不同大小颗粒停留时间操控的灵活性,尤其是细微颗粒。为实现这一目的,我们研究了水平和垂直旋涡流化床中的气相和颗粒相流动模式（RFB... 详细信息

流化床反应器广泛应用于包括燃烧、聚合的化工和生物质化学过程。为增强流化床反应器的效率,需要增加不同大小颗粒停留时间操控的灵活性,尤其是细微颗粒。为实现这一目的,我们研究了水平和垂直旋涡流化床中的气相和颗粒相流动模式（RFB）。单相气体在旋涡流化床中流动特性进行了数值模拟。研究了不同入口气体速度对单相气体流动特性分布的影响。结果表明气体切向速度在中心区域最小。沿径向方向逐渐增加,达到最大值。在壁面区域由于壁面能量的耗散,使得切向速度迅速降低。同时结果表明沿旋涡流化床轴向方向,气体切向速度逐渐降低。旋涡流化床中入口气体速度的变化影响气体压力和速度的改变,入口气体速度增加,床内气体压力下降,气体切向速度增大,旋转增强,提高了气体质量和动量的交换能力。气体-颗粒两相流体在在旋涡流化床中流动特性进行了数值模拟。为简化计算,我们的研究局限于对具有固定颗粒大小和无化学反应的恒温旋涡流化床的准三维模拟,通过计算流体动力学方法来分析RFB系统。在模拟中,颗粒相采用200-μm直径的颗粒,气相采用空气。计算得出气相和颗粒相的瞬时速度,空隙率和压降分布特性。模拟结果表明,通过控制入口气体速度可以控制颗粒的停留时间分布。模拟结果还发现床内表面的初始流态,分析了不同入口气体速度对旋涡流化床中颗粒速度和浓度分布的影响。结果表明随着气体速度的增加,沿径向颗粒浓度分布差异越大,壁面颗粒浓度增加,而中心区域浓度下降,显示出旋涡流化床颗粒旋转流动增加颗粒离析的特征。

关键词：旋涡流化床数值模拟两相旋涡流动气体-颗粒两相流单相湍流

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人声情感分析

人声情感分析

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作者： Dejoli Tientcheu Touko landry 华南理工大学

学位级别：硕士

情感分析技术应用已被在智能电子设备、医疗保健系统和其他几个领域得到应用。语音情感分析是指使用各种技术发现和分析语音数据中存在的潜在情感,重点关注人声的语音和非语音部分。语音情感识别的两个主要挑战是:第一,数据稀缺,可靠数... 详细信息

情感分析技术应用已被在智能电子设备、医疗保健系统和其他几个领域得到应用。语音情感分析是指使用各种技术发现和分析语音数据中存在的潜在情感,重点关注人声的语音和非语音部分。语音情感识别的两个主要挑战是:第一,数据稀缺,可靠数据集的数量有限。第二个问题是,混合情感出现在人声信号,例如,人们可能感知到混合信息,表达一种情感的语音和表达完全不同事物的非言语声音线索。这些差异促使我们研究使用鲁棒识别系统框架。最近,深度学习算法已成功地应用于语音情感识别(SER),各种模型结构显示出提取高级情感特征表示的良好能力,并在现有数据集上取得了良好的准确性。然而,当这些系统在现实中被应用时,精度会大幅下降。其中一个原因是,大多数关于人类情感识别系统的研究都是在安静的场景和环境中记录,是有请演员来扮演,是脚本数据集类型,其中背景噪声几乎不存在,一段音频尽量突出单个情感。性能下降的另一个原因是,在现有模型中没有考虑到自然人类交流过程中出现的包含有价值情感信息的情感声音和声音突发。本文的主要的工作需要将语音情感和非语音人声情感识别处理统一到一个框架中,即考虑了非语音人声情感识别与传统语音情感识别的高度关联性,有考虑到其特殊性为双过程情感分析方案提供合理性分析;本文的情感分析的研之涉及到语气(没有考虑词)通过分析音频样本数据的声学和频谱特征来优化人声情感识别。采取的步骤如下:1、构建了一个多语言数据集ASVP-ESD(音频、语音和视觉处理实验室-情感声音数据库),其中包括12635个音频样本,其中包含13种不同情感类别的语音(5090)和非语音(7545)情感声音。2、设计了一种基于语音/非语音鉴别的双过程情感识别;第一阶段采用线性回归算法是实现语音和非语音的分类,第二阶段将采用密集卷积网络结构与递归网络相结合的方法,分别提取局部和全局特征、时间相关特征,然后通过简单的logistic回归注意机制检测不同情绪之间的不同特征模式实现情感识别;考虑到人类除了使用包含情感状态的声学和词汇(词)信息的言语情态外,还可以使用非言语声音来表达情感;这两个阶段的识别可以有效地建立情感语音和非言语声音中表达的情感语音相关性(如:笑声代表快乐)。3、分析了该模型在现有和可用的基于公共语音的数据集上的性能。实施说话人无关实验后获得的结果表明,上述提出的模型架构在会话类型数据集(如具有4种不同情绪的IEMOCAP)上实现了与最新发布的结果相同的结果,并在单说话人数据集上实现了合理的结果。在使用两阶段识别策略,该模型在使用13种不同情绪的ASVP-ESD数据集上实现时达到了令人满意的精度,在测试集上超过了传统的单阶段方法2%的加权精度(WA)。

关键词：语音情感识别语音和非语音情感声音密集连接神经网络递归神经网络注意机制

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Bulk—like contribution of tunnel magnetoresistance in magnetic tunnel junctions

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Chinese Physics B 2003年第6期12卷 665-668页

作者：朱涛詹文山沈峰张泽 X.H.Xiang G.landry JohnQ.Xiao StateKeylaboratoryformagnetism insttitueofPhysicsChineseAcademyofSciencesBeijing100080China DepartmentofPhysicsandAstronomy UniversityofDelawareNewarkDelaware19716USA StateKeylaboratoryformagnetism insttitueofPhysicsChineseAcademyofSciencesBeijing100080China BeijingLaboratoryofElectronMicroscopy InstituteofPhysicsChineseAcademyofSciencesBeijing100080China DepartmentofPhysicsandAstronomy UniversityofDelawareNewarkDelaware19716USA

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Results of an Eight Year Long Practice of Saline Bipolar Transurethral Resection of Prostate

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Open Journal of Urology（泌尿学期刊） 2024年第4期 189页

作者： Sossa Jean Mangoue Moube Ariane landry Yevi Dodji Inès Magloire Hodonou Fred Avakoudjo Déjinnin Josué Georges

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Water Dynamics under Drip Irrigation to Proper Manage Water Use in Arid Zone

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Journal of Agricultural Chemistry and Environment 2021年第1期10卷 57-68页

作者： Siguibnoma Kevin landry Ouédraogo Marcel Bawindsom Kébré Francois Zougmoré Laboratoire de Matériaux et Environnement Université Joseph KI-ZERBO Ouagadougou Burkina Faso

The water resources reduction due to climate changes and also population increase, have contributed to increasing the constraint on water disponibility and accessibility. In the agricultural field, we need moderate soil and water resources management. This work aims to simulate water dynamics in soil under drip irrigation system in arid regions to better manage irrigation water. Simulations are done with soil physical properties of Burkina Faso. We assess maize plant water requirements for the whole growing season. With Hydrus 2D, we simulate water supply in the soil column. We assign atmospheric conditions on the top of the domain, zero flux of water on the lateral sides, and free drainage on the bottom boundary domain. We perform many irrigation events to analyze wetting pattern distribution around the emitter, which allowed us to contain the amount of irrigation water applied, only around the area dominated by roots, and then reduce water losses that roots cannot uptake. According to the different growing stages of the maize crop, we choose proper irrigation duration and frequency, and suggest irrigation schedule for the whole growing season.

关键词： Drip Irrigation Water Dynamics Hydrus (2D/3D) Water

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