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Predicting invasion potential of Senna didymobotrya (Fresen.) Irwin & Barneby under the changing climate in Africa

Ecological Processes 2021年第1期10卷 89-98页

作者： Elias ch.Weldemariam Dejene Sintayehu W. Department of Geo-information Science Haramaya UniversityDire DawaEthiopia College of Agriculture and Environmental Sciences Haramaya UniversityDire DawaEthiopia

Background:Senna didymobotrya is a native African flowering *** is suspected that climate change encourages the introduction and spread of invasive alien *** possible invasion of *** across the continent is expected to increase in the future due to ongoing climate ***,there is still paucity of empirical evidence on the extent to which the changing climate contributes to the surge of the flowering *** study,therefore,investigated the present and potential invasion of *** using the species distribution model under changing climate *** two representative concentration pathways(RCP4.5 and RCP8.5)and eight bioclimatic variables and one topographic variable were used to simulate the current and future(2050s and 2070s)invasion of *** in *** model performance was assessed using the area under the receiver operating characteristic curve(AUC)and true skill statistics(TSS).Results:The results of the study showed that under the current climatic conditions,18%of Africa is suitable for the establishment and invasion of *** most suitable hotspot for *** invasion is eastern Africa,followed by southern *** predicted model showed that by 2050,3.3%and 3.12%of the continent would be highly suitable areas for the invasion of the species under RCP4.5 and RCP8.5,*** the 2070s,under RCP4.5 and RCP8.5,the highly suitable area would be 3.13%and 2.7%,*** relation to the current suitability,the cumulative projected areas of the low and moderate suitability class under RCP4.5 and RCP8.5 will rise by the years 2050 and ***,under both RCPs,the non-suitable area for *** invasion would gradually ***:From the findings,it can be concluded that the ecosystem’s vulnerability to *** invasion under future climatic conditions will proliferate ***,to prevent the projected harm to biodiversity and ecosys

关键词： Senna didymobotrya Invasive species Climate change Africa Ensemble approach

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Effect of Diffuser Vane Shape on the Performance of a Centrifugal Compressor Stage

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Journal of Thermal Science 2014年第2期23卷 127-132页

作者： T ch Siva Reddy GV Ramana Murty MVSSSM Prasad Sreenidhi Institute of Science and Technology GhatkesarHyderabadA.P.India Vasavi College of Engineering Hhyderabad

The present paper reports the results of experimental investigations on the effect of diffuser vane shape on the performance of a centrifugal compressor stage. These studies were conducted on the chosen stage having a back- ward curved impeller of 500 turn tip diameter and 24.5 mm width and its design flow coefficient is Фd=0.0535. Three different low solidity diffuser vane shapes namely uncarnbered aerofoil, constant thickness flat plate and circular arc cambered constant thickness plate were chosen as the variants for diffuser vane shape and all the three shapes have the same thickness to chord ratio （t/c=0.1）. Flow coefficient, polytropic efficiency, total head coeffi- cient, power coefficient and static pressure recovery coefficient were chosen as the parameters for evaluating the effect of diffuser vane shape on the stage performance. The results show that there is reasonable improvement in stage efficiency and total head coefficient with the use of the chosen diffuser vane shapes as compared to conven- tional vaneless diffuser. It is also noticed that the aero foil shaped LSD has shown better performance when com- pared to flat plate and circular arc profiles. The aerofoil vane shape of the diffuser blade is seen to be tolerant over a considerable range of incidence.

关键词： Centrifugal compressor Vaneless diffuser Low solidity diffuser

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A Hyper-ellipsoid Model for Metallurgical Process Modelling by Genetic Algorithm

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Journal of Materials Science & Technology 1998年第6期14卷 567-568页

作者： Li, JF Li, ch chen, NY Lu, T chinese Acad Sci Shanghai Inst Met Shanghai 200050 Peoples R China Univ SW Louisiana Lafayette LA 70504 USA

A hyper-ellipsoid model, using genetic algorithm as method of computation, has been proposed to be used in certain metallurgical processes. It is especially suitable for the modelling of the metallurgical processes wi... 详细信息

关键词： Metallurgy

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Prevalence of Diabetes and Hypertension on World Diabetes Day 2022 in Guinea

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Open Journal of Endocrine and Metabolic Diseases 2024年第1期14卷 1-6页

作者： Mamadou Dian Mamoudou Diallo Mamadou Mansour Diallo Mamadou chérif Diallo Mamadou Alpha Diallo Alpha Mamadou Diallo Mody Abdoulaye Barry Kadija Dieng Abdoul Mazid Diallo El’Hadj Zainoul Bah Kadidiatou Bah Amatoulaye Diallo Amadou Kaké Naby Moussa Baldé Oumou Baldé Unité de Diabétologie H&#244pital régional de Labé Labe Guinea Université de Conakry Conakry Guinea Service de Diabétologie CHU Donka Conakry Guinea Fondation de Lutte Contre le diabète et MNT Conakry Guinea

Introduction: Diabetes mellitus and hypertension are chronic diseases that are on the rise and pose a major public health problem among the priorities of healthcare systems. Objectives: Determine the prevalence of diabetes and hypertension and describe the sociodemographic characteristics of those screened. Materials and Methods: This was a cross-sectional study organized during a diabetes and hypertension screening campaign that took place in Conakry and five (05) inland regions on November 14, 2022. Results: 2050 people were screened, of whom 33.12% were housewives, the average age was 44.78 ± 16.23 years, and 55.27% were women. The screening sites were the city of Conakry 741 (36.15%), the Labé region 424 (20.68%), the N’Zérékoré region 298 (14.54%), the Faranah region 241 (11.75%), the Mamou region 210 (10.24%) and the Boké region 136 (6.63%). The prevalence of diabetes and hypertension were respectively 12.5% and 43.38% for the Boké region;6.19% and 16.19% for the Mamou region;3.02% and 21.81% for the N’Zérékoré region;31.95% and 13.69% for the Faranah region;9.67% and 20.28% for the Labé region;2.83% and 20.28% for the city of Conakry. Conclusion: Despite the limitations of the study duration, our series highlighted the high prevalence of diabetes and hypertension among people screened on World Diabetes Day 2022. Raising public awareness of a healthy lifestyle is essential for the prevention and control of diabetes and hypertension.

关键词： Prevalence Diabetes Hypertension

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Mixed Convection Heat and Mass Transfer in a Micropolar Fluid with Soret and Dufour Effects

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Advances in Applied Mathematics and Mechanics 2011年第4期3卷 389-400页

作者： D.Srinivasacharya ch.RamReddy Department of Mathematics National Institute of TechnologyWarangal-506004Andhra PradeshIndia

A mathematical model for the steady,mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a micropolar fluid in the presence of Soret and Dufour effects is *** non-linear governing equations and their associated boundary conditions are initially cast into dimensionless forms using local similarity *** resulting system of equations is then solved numerically using the Keller-box *** numerical results are compared and found to be in good agreement with previously published results as special cases of the present *** non-dimensional velocity,microrotation,temperature and concentration profiles are displayed graphically for different values of coupling number,Soret and Dufour *** addition,the skin-friction coefficient,the Nusselt number and Sherwood number are shown in a tabular form.

关键词： Mixed convection heat and mass transfer micropolar fluid Soret and Dufour effects

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Frequency and Risk Factors of Neonatal Macrosomia at Labe Regional Hospital in Guinea

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Open Journal of Endocrine and Metabolic Diseases 2024年第2期14卷 26-32页

作者： Mamadou Dian Mamoudou Diallo Mamadou Mansour Diallo Mamadou chérif Diallo Alpha Mamadou Diallo Kadija Dieng Mody Abdoulaye Barry Mamadou Alpha Diallo Kadidiatou Bah Abdou Mazid Diallo El’hadj Zainoul Bah Mamadou Malal Bori Diallo Mamadou Sanou Sylla Amadou Kaké Diabetes Unit Labe Regional Hospital Labe Guinea Faculty of Health Sciences and Technology University of Conakry Conakry Guinea Department of Diabetes and Endocrinology Donka Hospital and University Center Conakry Guinea Neonatology Unit Labe Regional Hospital Labe Guinea

Macrosomia is defined as a term birth weight greater than or equal to 4000 grams, or greater than the 90 percentile of intrauterine growth curves. Excessive weight has harmful consequences for the newborn and is a major health concern. Objectives: To determine the frequency of neonatal macrosomia, describe risk factors and neonatal and maternal complications. Materials and methods: This was a cross-sectional study carried out between January and December 2022, involving newborns whose birth weight was greater than or equal to 4000 grams admitted to the neonatology unit of the Labe regional hospital. Results: 591 deliveries were recorded, 15 of which were macrosomic, representing a frequency of 2.54%. The average age of the women was 30.26 years. History of fetal macrosomia and diabetes was 93.33 and 71.43% respectively. The mean gestational age was 38.71 ± 0.75 SA, the mean antenatal consultation was 3 ± 0.8 and the mode of delivery was caesarean section (66.67%). Third-trimester ultrasound was performed in 53.33% of cases. Macrosomic newborns were male in 80% of cases. Neonatal complications were asphyxia (60%), hypoglycemia (20%) and hypocalcemia (13.33%). Factors associated with neonatal macrosomia were diabetes (P < 0.001), history of macrosomia (P Conclusion: this study shows that the frequency of neonatal macrosomia is 2.54% with high neonatal morbidity among newborns hospitalized in the neonatology unit of the Labé regional hospital. Screening for macrosomia risk factors during pregnancy is essential to prevent perinatal complications.

关键词： Frequency Macrosomia Labe

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Sum-connectivity index of a graph

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Frontiers of Mathematics in china 2016年第1期11卷 47-54页

作者： Kinkar ch. DAS Sumana DAS Bo ZHOU Department of Mathematics Sungkyunkwan University Suwon 440-746 Korea School of Information and Communication Engineering Sungkyunkwan UniversitySuwon 440-746 Korea Department of Mathematics South China Normal University Guangzhou 510631 China

Let G be a simple connected graph, and let di be the degree of its i-th vertex. The sure,connectivity index of the graph G is defined as χ（G） =∑vivj∈E（G）（di＋dj）-1/*** discuss the effect onχ（G）of inserting... 详细信息

关键词： Graph Randid index sum-connectivity index minimum degree

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Modeling Passengers Boarding in Aircraft Using Cellular Automata

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IEEE/CAA Journal of Automatica Sinica 2016年第4期3卷 365-384页

作者： Themistoklis Giitsidis Georgios ch.Sirakoulis IEEE Department of Electrical and Computer Engineering Democritus University of Thrace

Aircraft are profitable to their owners as long as they are in the air transporting passengers to their destinations;therefore it is vital to minimize as much as possible their preparation time on the *** this paper we simulate different boarding strategies with the help of a model based on cellular automata parallel computational tool,attempting to find the most efficient way to deliver each passenger to her/his assigned *** seat arrangements are used,a small one based on Airbus A320/ Boeing 737 and a larger one based on Airbus A380/ Boeing777-300.A wide variety of parameters,including time delay for luggage storing,the frequency by which the passengers enter the plane,different walking speeds of passengers depending on sex,age and height,and the possibility of walking past their seat,are simulated in order to achieve realistic results,as well as monitor their effects on boarding *** simulation results indicate that the boarding time can be significantly reduced by the simple grouping and prioritizing of *** accordance with previous papers and the examined strategies,the outside-in and reverse pyramid boarding methods outperform all the others for both the small and large airplane seat *** the latter,the examined strategies are introduced for first time in an analogous way to the initial small seat arrangement of Airbus A320/ Boeing737 aircraft ***,since in real world scenarios,the compliance of all the passengers to the suggested group division and boarding strategy cannot be guaranteed,further simulations were *** is clear that as the number of passengers disregarding the priority of the boarding groups increases,the time needed for the boarding to complete tends towards that of the random boarding strategy,thus minimizing the possible advantages gained by the proposed boarding strategies.

关键词： Cellular automata aircraft boarding modeling crowd dynamics

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Zagreb indices of graphs

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Frontiers of Mathematics in china 2015年第3期10卷 567-582页

作者： Kinkar ch. DAS Kexiang XU Junki NAM Department of Mathematics Sungkyunkwan University Suwon 440-746 Korea College of Science Nanjing University of Aeronautics & Astronautics Nanjing 210016China

The first Zagreb index M1 （G） is equal to the sum of squares of the degrees of the vertices, and the second Zagreb index M2 （G） is equal to the sum of the products of the degrees of pairs of adjacent vertices of the underlying molecular graph G. In this paper, we obtain lower and upper bounds on the first Zagreb index MI（G） of G in terms of the number of vertices （n）, number of edges （m）, maximum vertex degree （△）, and minimum vertex degree （δ）. Using this result, we find lower and upper bounds on M2（G）. Also, we present lower and upper bounds on M2（G）＋ M2（G） in terms of n, m, △, and δ, where denotes the complement of G. Moreover, we determine the bounds on first Zagreb coindex MI（G） and second Zagreb coindex M2（G）. Finally, we give a relation between the first Zagreb index and the second Zagreb index of graph G.

关键词： Graph first Zagreb index index inverse degree second Zagreb index Narumi-Katayama

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The Reading of a Painting

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中国翻译 2000年第3期 76-78页

作者： LiangShih-ch’iu

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