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Estimating the population density of the Asian tapir (Tapirus indicus) in a selectively logged forest in Peninsular Malaysia

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Integrative Zoology 2012年第4期7卷 373-380页

作者： D.Mark RAYAN Shariff Wan MOHAMAD Leejiah DORWARD Sheema Abdul AZIZ Gopalasamy Reuben CLEMENTS Wong Chai thiam CHRISTOPHER Carl TRAEHOLT David MAGINTAN WWF Malaysia SelangorMalaysia Durrell Institute of Conservation and Ecology(DICE) University of KentCanterburyUK School of Environmental Science University of East AngliaNorwichNorfolkUK School of Marine and Tropical Biology James Cook UniversityCairnsQueenslandAustralia Center for Malaysian Indigenous Studies University of MalayaKuala LumpurMalaysia Copenhagen Zoo CopenhagenDenmark Department of Wildlife and National Parks Kuala LumpurMalaysia

The endangered Asian tapir(Tapirus indicus)is threatened by large-scale habitat loss,forest fragmentation and increased hunting *** planning for this species,however,is hampered by a severe paucity of information on its ecology and population *** present the first Asian tapir population density estimate from a camera trapping study targeting tigers in a selectively logged forest within Peninsular Malaysia using a spatially explicit capture-recapture maximum likelihood based *** a trap effort of 2496 nights,17 individuals were identified corresponding to a density(standard error)estimate of 9.49(2.55)adult ta-pirs/100 *** our results include several caveats,we believe that our density estimate still serves as an important baseline to facilitate the monitoring of tapir population trends in Peninsular *** study also highlights the potential of extracting vital ecological and population information for other cryptic individual-ly identifiable animals from tiger-centric studies,especially with the use of a spatially explicit capture-recapture maximum likelihood based framework.

关键词： abundance camera trap large mammals maximum likelihood based framework Southeast Asia spatially explicit capture recapture(SECR)

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中水回用对社区景观水体叶绿素a变化的影响

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中国环境科学 2010年第10期30卷 1338-1343页

作者：李畅秦华鹏 Soon-thiam Khu 王波北京大学深圳研究生院环境与能源学院城市与人居环境科学与技术重点实验室广东深圳518055 萨里大学土木工程与物理科学学院深港产学研基地环境技术中心广东深圳518057

由于中水的营养盐含量较高,以中水为补水水源的社区景观水体存在较大的水华暴发风险.基于中水回用于景观水体的换水控制实验,建立了中水景观水体的富营养化模型,模拟了连续换水时和终止换水后叶绿素a的变化过程,分析了中水水质和换水周... 详细信息

由于中水的营养盐含量较高,以中水为补水水源的社区景观水体存在较大的水华暴发风险.基于中水回用于景观水体的换水控制实验,建立了中水景观水体的富营养化模型,模拟了连续换水时和终止换水后叶绿素a的变化过程,分析了中水水质和换水周期对水体藻类生长的影响.结果表明,提高中水水质可以降低水体的叶绿素a峰值;在连续换水期,随着换水周期的缩短,水体的叶绿素a峰值降低,并且从开始换水至达到峰值的时间增长;在连续换水期后终止换水,叶绿素a会重新达到峰值,并且原来的换水周期越短,水体的叶绿素a峰值反而越高,达到峰值所需时间越长.模型应用可为中水回用于社区景观水体的水量水质设计与维护提供依据.

关键词：中水回用景观水体叶绿素a 控制实验 WASP6

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Determination of an Equivalent Loading Circle Which May Represent the Loading of the Dual Wheels

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Open Journal of Civil Engineering 2018年第2期8卷 234-244页

作者： Baye Birane thiam Fatou Samb Adama Dione Laboratoire de Mécanique et Modélisation UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal Chef Département géotechnique UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal

This work aims to look for a simplifying surface that can represent the effect of the dual wheels on the variation of the stress and deformation state prevailing during the passage of traffic loads. This was facilitated by the results of thiam (2016) [4] obtained on the distribution of the vertical contact stress in the space described by the dual wheels. The analysis of the results of this study, on all the loading circles considered, shows that the radius loading circle equal to 0.181 m makes it possible to most probably represent the effect of the dual wheels. With this new surface, the effect of the dual wheels can be determined in 2D. The choice of this load is confirmed by a study in case of overload. Thus, the single axle with dual wheels is represented by a simplified diagram equipped on each side by a disk of radius 0.181 m. These results are obtained using a numerical simulation under Cast3M with a gravelly lateritic pavement.

关键词： Dual Wheels Circular Surface Equivalent Loading Circle Single Axle with Dual Wheels Lateritic Gravelly Cast3M

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Taking into Account the Effect of Dual Wheels on the Behavior of Lateritic Gravelly Pavements

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Geomaterials 2018年第3期8卷 27-37页

The representation in the three-dimensional space of the physical model symbolized by the application of the pairing of the wheels described by 2 disks with a radius of 0.125 m and a 0.375 m spacing has the advantage of more accurately simulating the loading. In most cases, the assumption of a uniform distribution of loading on the circular surface is considered. In order to determine the effect of dual wheels, this research proposes a new approach to the distribution of vertical contact stress in three-dimensional space with loading on the circular surface. This allowed evaluating the maximum deformation on the space described by the dual wheels. The results showed that vertical deformation is maximum at the center of each circular surface. The distribution of the vertical contact stress is non-uniform on the circular footprint and has a significant influence on the deformation of the pavement at the level of the bituminous layer. The impact assessment of the twinning reveals that the dual wheels load causes less damage than that of a single wheel. These results are obtained by means of a numerical simulation under Cast3M with a gravitational lateritic pavement.

关键词： Dual Wheels Circular Surface Single Axle with Dual Wheels Lateritic Gravelly Cast3M

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子汇水区划分精度对SWMM模拟城市非点源的影响

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环境科学与技术 2016年第6期39卷 179-186页

作者：秦攀雷坤乔飞 Soon-thiam KHU 中国环境科学研究院北京100012 Faculty of Engineering and Physical Sciences University of Surrey

SWMM作为动态模拟的城市非点源污染模型,被广泛应用于城市非点源负荷估算研究,并在很多小尺度研究中取得了很好的效果。随着中国城市发展不断加快,城市非点源污染研究的空间尺度也随之变大,如何科学合理选择建模时子汇水区划分精度成为... 详细信息

SWMM作为动态模拟的城市非点源污染模型,被广泛应用于城市非点源负荷估算研究,并在很多小尺度研究中取得了很好的效果。随着中国城市发展不断加快,城市非点源污染研究的空间尺度也随之变大,如何科学合理选择建模时子汇水区划分精度成为研究中一个重要问题。文章主要分析SWMM应用于城市区域非点源污染模拟时,不同子汇水区划分精度对水质模拟结果的影响,并在此基础上,以降低SWMM建模工作量并保证模拟结果的准确度为原则,对如何选择子汇水区的精度进行了深入的探讨。结果表明事件降雨为降雨输入时,子汇水区划分精度对水质模拟结果影响较大,宜采用高精度或高中精度模型;单月份和雨季连续降雨为降雨输入时,子汇水区划分精度对水质模拟结果影响较小,可以使用低精度模型。

关键词： SWMM 子汇水区划分精度城市非点源

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Characterizations of Drinking Water Quality for Populations of Hann Bel-Air (Dakar, Senegal)

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Journal of Water Resource and Protection 2020年第10期12卷 898-909页

作者： Alassane thiam Amadou Babacar Sarr Serigne Modou Sarr UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal Institut de Formation et de Recherches Médicales Dakar Sénégal Institut Supérieur de Formation Agricole et Rurale Université Alioune Diop Bambey Sénégal

Populations of Hann Bel-Air municipality are supplied with drinking water from taps water of “Sénégalaise Des Eaux” (SDE) and Jambar pumps which capturie directly the groundwater. This municipality is characterized by a strong environmental pollution which can affect the quality of drinking water. To determine actual quality of that water, 10 samples were taken and analyzed. Physico-chemical results have shown that tap water is more suitable for domestic consumption than Jambar pump water. The results show that physical parameters such as electrical conductivity (maximum value of 2671 μS/cm) exceed World Health Organization standard. The pH of the water from Jambar pumps is between 6.04 and 6.09, which demonstrates the aggressive character of that water. For tap water, pH values of 7.03 to 7.09 demonstrate their alkalinity. For chemical analyses, bicarbonates and sulphates concentrations respectively meet World Health Organization standards. Tap water meets World Health Organization standard for nitrates. With respect to chloride, the threshold of 250 mg/L is exceeded at all levels, but we note that high chloride concentrations are part of the exemptions granted to SDE. Tap water and water from water table have concentrations of calcium, potassium, iron and magnesium irreproachable. For sodium, EP3, EP4 and P5 samples from the web exceed World Health Organization standard with a peak of 310.27 mg/L. Tap water is more drinkable than groundwater but its quality needs to be improved and especially controlled for the well-being and sustainable health of consumers.

关键词： Hann Bel-Air Water Resources Physico-Chemical Analyses Quality

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Performance Evaluation of Asphalt Concrete Based on Basalt Aggregates of Diack and Quartzite of Bakel

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Open Journal of Civil Engineering 2023年第4期13卷 695-705页

作者： Mory Coulibaly Makhaly Ba Macodou thiam Babacar Diouf University Institute of Technology University Iba Der Thiam of Thiès Thiès Senegal UFR Engineering Sciences University Iba Der Thiam of Thiès Thiès Senegal

In Senegal, basalt aggregates are the aggregates used for the production of asphalt. They are also in some condition in base layer. However, the only licensed and operated basalt quarry in the west-central part of the country is finished and has reached very important depths thus constituting an environmental threat. This is how quartzite present in the east of the country precisely in the department of Bakel would constitute an alternative to basalt. For this purpose, the performance of two bituminous concretes based on quartzite and basalt was compared. One is made from Diack basalt aggregates, considered as the reference aggregate for asphalt in Senegal and the other is based on Bakel quartzite aggregates, they are both class 0/14. The mechanical performance of two bituminous concretes is evaluated using the Marshall method. The results obtained from the marshall tests give compactness values between 94% and 97% representing the limits laid down in the technical specifications, the creep values for quartzite-based asphalt concrete, while respecting the limit values, are higher than those obtained with basalt aggregates. Thus showing that the former is less resistant to deformation than the former. For both bituminous mixtures, the stability values remain above the minimum value of 1000 kgf set by the specifications. The water resistance test carried out on the two bituminous concretes based on basalt aggregate and quartzite aggregate gives values of immersion/compression ratio (R’c/Rc) equal to 0.72 and 0.82 respectively. These values are above the minimum required value (0.70) in the technical specifications in Senegal.

关键词： Quartzite Basalt Bituminous Concrete Marshall Duriez

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Epidemiological Profile of Women with Mental Disorders in Hospital in Dakar

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Open Journal of Psychiatry 2023年第4期13卷 355-372页

作者： Racky Wade-Kane Sokhna Seck Khourédia.thiam Ndéye Dialé Ndiaye Ndongo Papa Lamine Faye Aida Sylla Mamadou Habib thiam Department of Psychiatry and Medical Psychology National University Hospital Center of Fann Dakar Senegal

Introduction: Women are currently more likely than men to suffer from mental health problems. The prevalence of mental health problems among women is also increasing. However, few studies conducted in Africa provide epidemiological data on women. The aim of this study was to describe the epidemiological profile of women with mental health problems in Dakar. Methodology: This was a cross-sectional, retrospective, descriptive study over a five-year period, from 1 January 2017 to 31 December 2021. It concerned all women hospitalised for psychiatric reasons at the Psychiatry Department of Fann Hospital, Dakar, Senegal. The data collection form provided information on the sociodemographic profile, i.e., age, current address, marital status, ethnicity, religion, level of education, professional activity, and use of psychoactive substances. Results: The prevalence of mental disorders was 34.9% and concerned the following ICD-10 pathology groups [F00 - 09], [F10 - F19], [F20 - F29], [F30 - F39], [F40 - 48], [F50 - F59] and [F60 - F69]. The mean age of the patients was 37 years, with a standard deviation of 13 and extremes from 16 to 74 years. Most patients were unmarried (56%). Among the married patients, the monogamous regime was in the majority in our study: 56% compared with 44% for the polygamous regime. Women had to attend French school in 74% of cases. In our study, 32% of patients had reached university level. The majority were unemployed (67%). The notion of mourning was found in 214 patients (30.2%). The birth of one or more children marked the lives of 184 patients (26%). Divorce was noted in 103 patients (14.5%). Marital conflicts were experienced by 94 patients (13.3%). Twenty percent of the patients had used psychoactive substances. Conclusion: The epidemiological profile of a woman with a mental disorder in Dakar is that of a single woman in her forties who had attended university and was a housewife. She does not use psychoactive substances and has experience

关键词： Epidemiological Profile Dakar Mental Disorder Woman

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Monazite Recovery by Magnetic and Gravity Separation of Medium Grade Zircon Concentrate from Senegalese Heavy Mineral Sands Deposit

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Journal of Minerals and Materials Characterization and Engineering 2021年第6期9卷 590-608页

作者： Moumar Dieye Mohamadou Moustapha.thiam Anthony Geneyton Mamadou Gueye Earth Science Institute Cheikh Anta Diop Dakar University Dakar Senegal Eramet Ideas Trappes France

Gravity, magnetic and electrostatic separation methods allowed to obtain different titanium oxide concentrates (ilmenite, leucoxene, rutile) and different varieties of zircon concentrates (premium zircon, standard zircon, medium grade zircon standard) from Senegal’s heavy mineral sands. During mining separation, monazite, which is a paramagnetic mineral, was found in a non-negligible concentration of 0.57 wt% on average in the medium grade zircon standard which also contains 37.96 wt% zircon and 44.46 wt% titanium oxides. Magnetic and gravity separation tests were carried out on the Medium grade zircon standard (MGZS) to produce a monazite concentrate at Eramet Ideas laboratory. Magnetic separation at 1.5 teslas intensity resulted in the recovery of 94.8% of the monazite from the MGZS. Gravity separation also recovered 76.6% of the monazite from the MGZS. The combination of these two treatment methods can thus produce three concentrates from MGZS (a monazite concentrate, a zircon concentrate, and a titanium oxide concentrate).

关键词： Monazite Heavy Mineral Sands Separation Gravity Magnetic

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Clinical Profile of Women with Mental Disorders in Dakar Hospitals

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Open Journal of Psychiatry 2023年第S1期13卷 392-409页

Introduction: In Senegal, knowledge of the clinical profile of mental disorders in women has not been the subject of many studies, even though it is of vital importance to those involved in mental health. Thus, the aim of our study was to describe the clinical aspects of psychiatric disorders in women hospitalized at Fann. Methodology: This was a cross-sectional, retrospective, and descriptive study over a five-year period. We identified 402 cases that met the selection criteria. The data collection form provided information on aspects of the clinical profile of mental disorders, such as medical, surgical, gynecological, obstetrical and psychiatric history, instigator of the request for care, diagnosis, duration and number of hospitalizations. ICD-10 was used for the various pathologies identified. Results: Asthma was noted in 7% of patients, as was hypertension. Gynecological surgery was found in 43 patients (11%). Eight patients were menopausal (2%). The mean number of gestations was 2.09, with a standard deviation of 2.257 and extremes between 0 and 10 gestations. Patients with a history of abortion numbered 58 (14%). The decision to hospitalize the patients was made by 96% (384 patients) of those around them. Hetero aggression was the most recurrent reason for hospitalization (19%). Pathology group F20-29 (schizophrenia, schizotypal disorder, and delusional disorders) was the majority group. Conclusion: The clinical profile of the mentally ill woman in Dakar is a woman in her mid-forties who most often presents with a personal psychiatric history, and her hospitalization is prompted by hetero-aggression and/or logorrhea. She usually suffers from schizophrenia and related disorders. Hospitalization usually lasts between 11 and 20 days.

关键词： Dakar Clinical Profile Mental Disorders Woman

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