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高镁型低品位镍硫化矿的柱浸和堆浸研究

高镁型低品位镍硫化矿的柱浸和堆浸研究

作者： maurice A. Campbell 中南大学

学位级别：硕士

本论文分析和评述矿物加工技术特别是生物浸出和堆浸机技术进展。研究浸出过程中的影响因素,以便更好研究它们之间的相互作用,强化浸出过程,开发最佳的浸出工艺。检测与细菌生长繁殖有关的营养物质、温度、pH、种群动态分析、物理和化... 详细信息

本论文分析和评述矿物加工技术特别是生物浸出和堆浸机技术进展。研究浸出过程中的影响因素,以便更好研究它们之间的相互作用,强化浸出过程,开发最佳的浸出工艺。检测与细菌生长繁殖有关的营养物质、温度、pH、种群动态分析、物理和化学变化。探索不同细菌间的共生关系以及混合菌对反应动力学的影响。通过基因操作和细菌驯化,提高浸矿微生物对浸出液中对微生物生长繁殖有害的离子浓度的耐受性,经过近两年的实验室驯化,细菌对Mg的耐受性从10g/L提高到25g/L。这项工作研究了金川高氧化镁(MGO30-35%,主要存在于橄榄石、绿泥石和蛇纹石等脉石中)低品位硫化镍矿,浸矿细菌为中温Acidithiobacillus ferrooxidans和Acidithiobacillus thiooxidans混合菌。目的在于对金川低品位硫化镍矿生物浸出回收有价金属的可行性研究。经过60天的预浸和252天的细菌浸出,镍的浸出率为91%,钴的浸出率为81%。试验很好,在此基础上进行堆浸试验。 500吨的堆浸系统采用混合中温菌:Acidithiobacillus ferrooxidans(FJ164046;DQ321745),Acidithiobacillus thiooxidans(EF059760)和Leptospirillum ferrooxidans(DSM2391)。通过三个阶段(从25L到500L,最后是10m)逐步扩大培养中获得细菌接种。浸出过程中所需硫酸来自工业硫酸和处理冶炼废气所得的酸性废水(pH=0.0-0.3)。经过80天的预浸和270天的生物浸出,镍的浸出率为84.6%,钴的浸出率为75.0%。

关键词：柱浸堆浸中温菌镍硫化矿镁

A Hybrid DNN-RBFNN Model for Intrusion Detection System

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Journal of Data Analysis and Information Processing 2023年第4期11卷 371-387页

作者： Wafula maurice Oboya Anthony Waititu Gichuhi Anthony Wanjoya Department of Statistics and Actuarial Sciences Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

Intrusion Detection Systems (IDS) are pivotal in safeguarding computer networks from malicious activities. This study presents a novel approach by proposing a Hybrid Dense Neural Network-Radial Basis Function Neural Network (DNN-RBFNN) architecture to enhance the accuracy and efficiency of IDS. The hybrid model synergizes the strengths of both dense learning and radial basis function networks, aiming to address the limitations of traditional IDS techniques in classifying packets that could result in Remote-to-local (R2L), Denial of Service (Dos), and User-to-root (U2R) intrusions.

关键词： Dense Neural Network (DNN) Radial Basis Function Neural Network (RBFNN) Intrusion Detection System (IDS) Denial of Service (DoS) Remote to Local (R2L) User-to-Root (U2R)

Long-distance correlation between tectonic-controlled,isolated carbonate platforms by cyclostratigraphy and sequence stratigraphy in the Devonian of South China

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Long-distance correlation between tectonic-controlled,isolat...

中国科学院地质与地球物理研究所2001学术年会

作者： maurice E.TUCKER Department of Geological Sciences University of Durham

During the early Middle Devonian in South China,an extensive carbonate platform was broken up through extension to create a complex pattern of platforms,and interplatform *** Givetian and Frasnian carbonate successions,five depositional facies,including peritidal,restricted shallow subtidal,semi-restricted subtidal,intermediate subtidal and deep subtidal facies,and 18 lithofacies units are recognized from measured sections on three isolated *** deposits are arranged into metre-scale,upward-shallowing peritidal and subtidal *** third-order sequences are identified from changes in cycle stacking patterns,vertical facies changes and the stratigraphic distribution of subaerial exposure *** sequences mostly consist of a lower transgressive part and an upper regressive part. Transgressive packages are dominated by thicker-than-average subtidal cycles, and regressive packages by thinner-than-average peritidal *** boundaries are transitional zones composed of stacked,high-frequency, thinner-than-average cycles with upward-increasing intensity of subaerial exposure,rather than individual,laterally traceable *** sequences can be further grouped into catch-up and keep-up sequence sets from the long-term (second-order) changes in accommodation and vertical facies changes. Catch-up sequences are characterized by relatively thick cycle packages with a high percentage of intermediate to shallow subtidal facies,and even deep subtidal facies locally within some individual sequences,recording long-term accommodation ***-up sequences are characterized by relatively thin cycle packages with a high percentage of peritidal facies within sequences,recording long-term accommodation *** of long-term accommodation changes expressed by Fischer plots reveals that during the late Givetian to early Frasnian increased accommodation loss on platforms coincided with increased accommodation gain in interplatform basins.

关键词： Cyclostratigraphy Frasnian.Givetian high-frequency cyclicity isolated platforms platform carbonate correlation South China

包容性金融发展对农业公司创业绩效的影响：对30个撒哈拉以南非洲国家的实证研究

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包容性金融发展对农业公司创业绩效的影响：对30个撒哈拉以南非洲...

作者： Kanaado maurice Balibae 江苏大学

学位级别：硕士

金融的一个基本理念是包容性金融发展,旨在让所有个人和企业,尤其是那些尚未加入官方金融体系的企业,都能以低廉的价格获得各种金融商品和服务。金融知识是影响农业企业或企业家获得金融服务的难易程度的主要因素之一。本研究调查了2009... 详细信息

金融的一个基本理念是包容性金融发展,旨在让所有个人和企业,尤其是那些尚未加入官方金融体系的企业,都能以低廉的价格获得各种金融商品和服务。金融知识是影响农业企业或企业家获得金融服务的难易程度的主要因素之一。本研究调查了2009-2017年包容性金融发展对30个撒哈拉以南非洲国家普惠金融对农业创业公司业绩的影响。为了说明金融发展的各个方面,我们使用了新创建的普惠金融发展指数,使用Ramsey RESET检验、White异方差检验、Breush和Pagan检验以及Breusch和Godfrey LM的诊断检验检验序列相关性以利用异方差的存在。为了确定中介变量对自变量和因变量的影响,显示了中介路径模型估计和中介效应结果的结果。为了评估结果的可靠性,使用增广平均组面板估计和公共相关效应进行稳健性测试,我们最终检查企业绩效表现,基于金融包容性使用格兰杰因果检验以确定变量之间的联系。结果表明,根据Kao面板协整检验,普惠金融发展与所选变量显示出协整相关性。中介路径分析的结果表明,普惠金融的增长与农业创业公司的成功之间存在显着的正相关关系。结果还表明,金融知识对这种关系有直接影响;包容性金融发展通过满足企业对可获得的、廉价的和广泛的信贷的需求以及为了投资者和企业的利益而对风险进行有效和成本效益管理的需求,从而促进企业的创业活动。

关键词：普惠金融企业创业绩效撒哈拉以南非洲回归估计中介效应农业

Non-suicidal self-injury in borderline adolescents:does it make difference?

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Non-suicidal self-injury in borderline adolescents:does it m...

第十九届世界儿童及青少年精神卫生与相关学科学术会议

作者： Ludovic Gicquel maurice Corcos Institut Mutualiste Montsouris Service du Pr CorcosUniversite Paris 5Rene DescartesFrance

＜正＞Background Non-Suicidal Self-Injury（NSSI） among people with a borderline personality disorder（BPD） is a very frequent and probably relevant behavior in the course of such *** to Zanarini（2008）,53%of BDP subjects will engage in NSSI and vice versa both Herpertz（1995） and Nock and Prinstein（2006） found 52%of BPD in their samples of adults and adolescents ***,the three main types of NSSI with BPD people are self-cutting,hit a wall,*** BPD,from a dimensional approach,we can also

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渗流对盾构隧道荷载形式和性能的影响分析

渗流对盾构隧道荷载形式和性能的影响分析

作者： HUBUMUGISHA Jules maurice 北京交通大学

学位级别：硕士

本文分析了渗流对盾构隧道荷载形式以及开挖过程中的力学行为的影响。采用了两种解析方法,对地下水稳定的均质各向同性地基上圆形断面的排水隧道进行计算:一种是无灌浆区,另一种是有灌浆区,并进行了相应的数值模拟。根据这些理论和数值... 详细信息

本文分析了渗流对盾构隧道荷载形式以及开挖过程中的力学行为的影响。采用了两种解析方法,对地下水稳定的均质各向同性地基上圆形断面的排水隧道进行计算:一种是无灌浆区,另一种是有灌浆区,并进行了相应的数值模拟。根据这些理论和数值计算和分析,可以得出以下观测结果:1.结果表明,地下水渗流相比其他影响因素对孔隙水压力的影响最显著。对于无灌浆区的隧道,观察到当衬砌渗透性由1x10-8m/s增加到1x10-6m/s时,孔隙压力明显降低;对于有灌浆区的隧道,当灌浆渗透性由1x10-6m/s增加到1x10-5m/s时,孔隙压力也降低显著。因此,应采用一定的衬里和灌浆减少地下水的渗漏。2.根据分析得到,随着地下水渗漏量的增加,水平总应力和垂直总应力分布均减小。这是由于渗透对孔隙压力具有影响,其中孔隙压力是总应力的一部分。3.地下水渗漏对盾构隧道的荷载形式及其大小有较大影响。因此,根据所得结果,提出了一个表征作用在隧道衬砌上的荷载的简化模型,其中包括不同地下水渗透速率下的水平荷载和垂直荷载。4.从数值解中可以得到,在开挖过程中隧道面均匀水头的升高,使得隧道面地下水的渗漏从而增加了隧道周围地面的衬砌力和沉降值。

关键词：渗透效应荷载形式盾构隧道解析解数值模拟

Remarks at the Closing Ceremony of Beijing Forum

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Remarks at the Closing Ceremony of Beijing Forum

文明的和谐与共同繁荣：对人类文明方式的思考——北京论坛（2006）

作者： maurice F.Strong Former Under-Secretary-General The United Nations

I am pleased to have the privilege of addressing this distinguished Forum from which I have so much to *** views I will present are those of a practitioner not a scholar. As human beings emerged,first it is believed in Africa,as the dominant species on Earth and migrated to all the other habitable continents,their

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Radiocarbon Concentration Measurements in Tree Leaves near SOCOCIM (Rufisque, Senegal), A Cement Factory

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Open Journal of Air Pollution 2022年第1期11卷 1-12页

作者： maurice Ndeye Hans-Arno Synal Matar Séne Laboratoire Carbone 14 IFAN CH.DIOP Université Cheikh Anta Diop Dakar Sénégal Laboratory of Ion Beam Physics ETH Zurich Switzerland Département de physique Faculté des Sciences et Techniques Université Cheilkh Anta Diop Dakar Sénégal

Radiocarbon content in biogenic samples is widely used to study the variation of atmospheric CO2 due to anthropogenic activities. A total of 20 samples of several types of tree leaves, were analyzed for this study. Sampling was carried out at the end of the rainy season in 2017 from the surrounding of the SOCOCIM cement factory in Rufisque town. Rufisque is located on the peninsula of Cape Verde, 25 km east of Dakar, where it is the 《south gate》 of the agglomeration. Reference samples of five different species were collected during the same period (2017) from a clean zone. The 14C method was used for the determination of Δ14C values. The data show that the 14C concentration in the studied sites was significantly lower than the clean area, due to the release of anthropogenic CO2. To estimate the Suess effect, the fossil fuel fraction was determined based on equations of mass balance for CO2 concentration, stable isotopic composition of carbon, and 14C concentration. The results show that selected locations are affected differently according to their distance from the factory and the wind direction.

关键词： Radiocarbon Concentration Fossil Fuel Fraction Tree Leaves Cement Factory

Carbonate platform evolution:from a bioconstructed platform margin to a sand-shoal system(Devonian,Guilin,South China)

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Carbonate platform evolution:from a bioconstructed platform ...

中国科学院地质与地球物理研究所2002学术年会

作者： maurice E.TUCKER Department of Geological Sciences University of Durham

The depositional organization and architecture of the middle-late Devonian Yangdi rimmed carbonate platform margin in the Guilin area of South China were related to oblique, extensional faulting in a strike-slip *** platform margin shows two main stages of construction in the late Givetian to Frasnian,with a bioconstructed margin evolving into a sand-shoal *** the late Givetian,the platform margin was rimmed with microbial buildups composed mainly of cyanobacterial colonies(mostly Renalcis and Epiphyton).These grew upwards and produced an aggradational(locally slightly retrogradational) architecture with steep foreslope *** depositional sequences(S3-S5) are recognized in the upper Givetian strata,which are dominated by extensive ***-scale depositional cyclicity occurs in most facies associations,except in the platform-margin buildups and upper foreslope *** the latest Givetian(at the top of sequence S5),relative platform uplift(±subaerial exposure) and associated rapid basin subsidence(probably a block-tilting effect) caused large-scale platform collapse and slope erosion to give local scalloped embayments along the platform margin and the synchronous demise of microbial ***,sand shoals and banks composed of ooids and peloids and,a little later,stromatoporoid buildups on the palaeohighs,developed along the platform margin, from which abundant loose sediment was transported downslope to form gravity-flow deposits. Another strong tectonic episode caused further platform collapse in the early Frasnian(at the top of sequence S6),leading to large-scale breccia release and the death of the stromatoporoid buildups. Siliceous facies(banded cherts and siliceous shales) were then deposited extensively in the basin centre as a result of the influx of hydrothermal *** platform-margin sand-shoal/bank system, possibly with gullies on the slope,persisted into the latest Frasnian until the restoration of micr

关键词： Carbonate platform microbially rimmed platform margin sand-shoal system South China