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Phenomenological behavior of rock salt:On the influence of laboratory conditions on the dilatancy onset

Journal of Rock mechanics and Geotechnical Engineering 2019年第4期11卷 723-738页

作者： A.Rouabhi P.Labaune m.tijani N.Gatelier G.Hevin mINES ParisTech PSL Research UniversityCentre de Geosciences35 rue St HonoreFontainebleau77300France Geostock Entrepose 2 rue des MartinetsRueil-Malmaison92500France Storengy 12 rue Raoul NordlingBois-Colombes92274France

Recently,stress-based dilatancy criteria have become essential tools to design underground facilities in salt formations such as gas storage ***,these criteria can depend critically on the volumetric strain measurements used to deduce the dilatancy *** from conventional triaxial compression tests can show different volumetric behavior depending on the loading conditions,as well as on the measurement *** order to obtain a quantitative understanding of this problem,an experimental program was carried out and the testing procedure was investigated numerically under homogeneous and heterogeneous stress *** experimental results showed that the deviatoric stress corresponding to the dilatancy onset was significantly dependent on the measurement *** a heterogeneous stress state,the simulation results revealed that the strain measurements at different scales (referred to as local,hybrid or global) can provide different volumetric results with moderate to significant deviations from the idealized behavior,and hence different onsets of *** also proved that,under low confinement,tensile stresses can take place within the compressed specimen,leading to a great deviation of the dilatancy onset from the idealized *** both experimental and numerical investigations,the difference in sensitivity to the measurement techniques between the deviatoric and the volumetric behaviors is explained by the relatively small values of the volumetric *** non-ideal laboratory conditions have more impact on this strain than on the deviatoric *** findings can have implications for the interpretation of the dilatancy behavior of rock salt,and hence on the geomechanical design aspects in salt formations.

关键词： Rock salt Triaxial tests Dilatancy onset End restraint Viscoplasticity

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Feasibility Analysis of mERIS as a Tool for monitoring Lake Guiers (Senegal) Water Quality

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Journal of Water Resource and Protection 2016年第1期8卷 100-119页

作者： Seybatou Diop Souléye Wade moshood N. tijani Institute of Earth Sciences Faculty of Sciences and Techniques Cheikh Anta Diop University of Dakar Dakar Senegal Department of Geology University of Ibadan Ibadan Nigeria

ENVISAT/mERIS scenes of Lake Guiers covering the period 2003-2010 were processed for concentration retrieval of chlorophyll a (CHLa), suspended particulate matter (SPm) and colored fraction of dissolved organic matter (CDOm), i.e. the three main parameters relevant to the water quality management of the lake. Estimates in the range of 30 - 117 μg CHLa L-1 (average 62.13 μg·L-1), 0.10 - 29.0 mg SPm L-1 (average 22.01 mg·L-1), and 1.10 - 1.90 CDOm m-1 (average 1.33 m-1) were recorded, suggesting the possibility of occasional poor quality waters in some compartments of the lake. The values calculated as part of this study are consistent with literature data. On the basis of these estimates, interpretations were made as to the feasibility of applying mERIS data for synoptic environmental monitoring purposes. The data were subjected to statistical analysis, including regression analysis and significance tests. Estimates of CHLa and CDOm revealed some level of correlation, which suggests that phytoplankton biomass degradation may account for nearly 47% of the dissolved optical compounds CDOm. Notable areas of high CHLa and CDOm concentrations are found in the southern inshore zone, an environment with less water agitation. In contrast, SPm concentrations tend to increase in environments of very shallow water marked by high water turbulence and bottom mobility. However, it was not possible to fully assess the model performance and detection accuracy of the results due to lack of ground truths. Nonetheless, the results show concentrations that compared well with the insitu data from earlier studies and data reported elsewhere from other lacustrine systems. Therefore, it can be inferred from this study that mERIS data present a useful low-cost (i.e. cost effective and readily available) approach for environmental monitoring of Lake Guiers waters with excellent spatial coverage. In addition, the study highlight

关键词： Lake Guiers mERIS Environmental monitoring Water Quality Chlorophyll a Suspended Particulate matter Colored Dissolved Organic matter

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Diagnosis Study of the Louga-Ouarack-Ndoyene R31 Regional Road (Senegal)

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Geomaterials 2015年第1期5卷 34-44页

作者： Seybatou Diop meissa Fall Adama Dione moshood N. tijani Institut des Sciences de la Terre Faculté des Sciences et Techniques Université Cheikh Anta Diop de Dakar Dakar Sénégal Laboratoire de mécanique et modélisation UFR Sciences de l’Ingénieur Université of Thiès Thiès Sénégal Department of Geology University of Ibadan Ibadan Nigeria

The degree of structural damage of the Louga-Ouarack-Ndoyene R31 regional road was surveyed using Lacroix deflectographe and geotechnical testing, in order to recommend possible rehabilitation measures aimed at maintaining the high level of service over the projected life span of the road. The data processing and interpretation were essentially based on the French standards and specifications, through which synthetic variables were generated with a qualitative significance?and on the basis of which the extent of repairs and rehabilitation works to be undertaken were suggested. The decision grid thus produced, revealed road structure quality indices of mostly Q3, Q4, and Q5 types for a segment length of 36.954 km (equivalent to some 69.44% of the total road section), which justifies some major reinforcement works. The remaining part of the road section (nearly?30.56% with road quality indices ≤ Q2) is still in acceptable condition, requiring only some?minor maintenance works. The rehabilitation costs were estimated to be of the order of?5,352,000,000 (five billion three hundred fifty-two million) CFA francs, based on local market price conditions.

关键词： Senegal Road Diagnosis Lacroix Deflectograph Deflection Reinforcement maintenance

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Comparison of Phytochemicals and Anti-Nutritional Factors in Some Selected Wild and Edible Bean in Nigeria

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Food and Nutrition Sciences 2016年第2期7卷 102-111页

作者： Awoyinka O. A. Ileola A. O. Imeoria C. N. tijani T. D. Oladele F. C. Asaolu m. F. Department of medical Biochemistry College of Medicne Ekiti State University Ado Ekiti Nigeria Department of Biochemistry Ekiti State University Ado Ekiti Nigeria Department of Science Laboratory Technology Ekiti State University Ado Ekiti Nigeria

This work aims at analyzing the bioactive and anti-nutritional compounds of edible and wild beans when unprocessed and malted. Qualitative screening of phytochemicals in the various bean samples was determined in ethanol and petroleum ether solvents. Results of the anti-nutritional compositions of unprocessed wild bean extracted with petroleum ether showed there were no traces of saponin and polyphenol, in Feregede and also in edible bean-IT07K-243-1-10 which also had no traces of saponin and tannin. After malting, saponin was totally absent in Pakala, mucuna, IT97k-499-35, IT07k-243-1-10, and IT04k-333-2 respectively. Polyphenol was also found to be absent in IT07k-243-1-10. mucuna has the highest phytic acid level (7.8867 ± 0.011) while Feregede has the lowest phytic acid level (2.9810 ± 0.004). Otili has the highest anti-trypsin level (12.001 ± 0.0013). This study showed varying levels of anti-nutrients on the respective bean samples when unprocessed but decreased marginally after malting. It was keenly noted that values derived, either before and after malting were not significantly different (P ≤ 0.05) from each other. In all, this study had further shown that malting process enhanced removal of anti-nutrients which invariably would lead to availability of nutrient for animal and human consumption.

关键词： Beans Saponin Tannin Trypsin Polyphenol

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The metabolic Syndrome and Sexual Dysfunction in a State of Inflammation

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Advances in Sexual medicine 2017年第2期7卷 82-96页

作者： Huseini Alidu W. K. B. A. Owiredu Nafiu Amidu Peter Paul mwinsanga Dapare Ahmed tijani Bawah Christian Kofi Gyasi-Sarpong Christian Obirikorang Department of medical Laboratory Science University of Health and Allied Sciences Ho Ghana Department of molecular medicine Kwame Nkrumah University of Science & Technology Kumasi Ghana Department of Biomedical Laboratory Science University for Development Studies Tamale Ghana Department of Surgery (Urology Unit) Komfo Anokye Teaching Hospital Kumasi Ghana

Background: Diabetes is amongst the most researched diseases worldwide due to its debilitating effects on patients. Diabetics have a higher risk of developing erectile dysfunction. Evidence has linked erectile dysfunction severity to increased age, duration of diabetes, the metabolic syndrome and hypogonadism. However, the role of inflammatory markers in the pathogenesis of SD is still unclear. The contributions of hormonal parameters and adipokines to both macro and micro vascular complications are still poorly understood. This study was conducted to provide some evidence of an association between SD, the metabolic syndrome and inflammatory hormones. method: A total of 130 diabetic males participated in this study. All participants were at least 18 years and were actively engaged in a stable heterosexual relationship for a minimum of two years before they were recruited for this study. The Diabetic men were evaluated using the Golombok Rust Inventory of Sexual Satisfaction for males (GRISS-m). The NCEP-ATP III, IDF and WHO criteria were used to assess the metabolic syndrome. Blood samples were taken for biochemical and hormonal assays. Results: Participants with raised Triglyceride levels showed significantly higher leptin levels for NCEP-ATP III and IDF criteria. Participants with impotence showed significantly lower leptin/adiponectin ratio (p = 0.0184) whilst participant with non-sensuality showed significantly higher values of leptin/adiponectin ratio (p = 0.0103). A significantly higher levels of insulin (p = 0.0265) was recorded in participants with Dissatisfaction problems. Participants with Non communication problems showed significantly higher levels of insulin (p = 0.0419) and lower levels of adiponectin (p = 0.0438) whilst participants with infrequency showed significantly lower levels of adiponectin (p = 0.0042). Conclusion: The relative balance between pro inflammatory and anti-inflammatory mediators of endothelial dysfunction could possibly be essenti

关键词： Golombuk-Rust Inventory for Sexual Satisfaction-male metabolic Syndrome Sexual Dysfunction

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Alcohol Consumption Is Associated with Hypogonadism and Decreased Sexual Function in Ghanaian Diabetics

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Advances in Sexual medicine 2017年第3期7卷 121-130页

作者： Huseini Alidu William K. B. A. Owiredu Nafiu Amidu Christian Kofi Gyasi-Sarpong Peter Paul mwinsanga Dapare Ahmed tijani Bawah Arnold Togiwe Luuse Emmanuel Barima Agyemang Prempeh Department of medical Laboratory Science University of Health and Allied Sciences Ho Ghana Department of molecular medicine Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Biomedical Laboratory Science University for Development Studies Tamale Ghana Department of Surgery (Urology) Komfo Anokye Teaching Hospital/SMS-KNUST Kumasi Ghana Department of Academic Affairs University of Health and Allied Sciences Ho Ghana

Introduction: Alcohol usage has largely been seen as a risk factor for the development of sexual dysfunction as well as erectile dysfunction. Others have reported that prolonged alcohol usage and abuse is compatible with normal sexual function in the absence of endocrinological problems as well as hepatic dysfunction. About seventy five (75) percent of alcoholics have various sexual difficulties with improvements in sexual functions occurring after treatment of alcoholism and psychosexual therapy. It is evident from the various reports over the years that mild and occasional alcohol usage is not as much implicated in the causation of SD and its other forms as heavy, addictive or dependent alcohol usage. Alcohol usage has also long been linked to hypogonadism, testicular atrophy as well as leydig cell toxicity. Alcohol induced hypogonadism has been reported to resolve after withdrawal of alcohol use. Since both diabetes and alcohol usage have been strongly associated with both hypogonadism and sexual dysfunction, it is logical to expect that diabetics who frequently consume alcohol will have a worsened hypogonadal state and sexual function. This research therefore seeks to provide evidence of an association between alcohol consumption in diabetics and a worsened sexual dysfunction in comparison to diabetics who did not consume alcohol. methods: Type II diabetic patients attending the Diabetic Clinic at the maamobi General Hospital between the periods of January 2010 and march 2011 were consecutively recruited for this study. Diabetics with other known endocrinological diseases and physical disabilities were excluded from the study. Sexual function was assessed using the GRISS-m. Early morning fasting samples were used in lipid and testosterone profile assays. Results: Study participants who consumed alcohol recorded higher levels of triglycerides and LDL-Cholesterol. They also recorded significantly lower levels of bioavailable testosterone. Furthermore they also rec

关键词： Hypogonadism Sexual Dysfunction Erectile Dysfunction Libido Alcohol Abuse

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