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Thermodynamic database development—modeling and phase diagram calculations in oxide systems

Rare Metals 2006年第5期25卷 473-480页

作者： arthur d.pelton Center for Research in Computational Thermochemistry Ecole PolytechniqueP.O.Box 6079Station "Downtown"MontrealQuebec H3C 3A7Canada

The databases of the FactSage thermodynamic computer system have been under development for 30 years. These databases contain critically evaluated and opthnized data for thousands of compounds and hundreds of multicomponent solutions of solid and liquid metals, oxides, salts, sulfides, etc. The databases are automatically accessed by user-friendly software that calculates complex multiphase equilibria in large multicomponent systems for a wide variety of possible input/output constraints. The databases for solutions have been developed by critical evaluation/optimization of all available phase equilibrium and thermodynamic data. The databases contain parameters of models specifically developed for different types of solutions involving sublattices, ordering, etc. Through the optimization process, model parameters are found which reproduce all thermodynamic and phase equilibrium data within experimental error limits and permit extrapolation into regions of tempea＇ature and composition where data are unavailable. The present article focuses on the databases for solid and liquid oxide phases involving 25 elements. A short review of the available databases is presented along with the models used for the molten slag and the solid solutions such as spinel, pyroxene, olivine, monoxide, corundum, etc. The critical evaluation/optimization procedure is outlined using examples from the Al203-SiO2-CaO-FeO-Fe2O3 system. Sample calculations are presented in which the oxide databases are used in conjunction with the FactSage databases for metallic and other phases. In particular, the use of the FactSage module for the calculation of multicomponent phase diagrams is illustrated.

关键词： thermodynamics oxides databases phase diagrams

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Axonal Conduction Velocity: A Computer Study

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Journal of Applied Mathematics and Physics 2024年第1期12卷 60-71页

作者： arthur d. Snider Aman Chawla Salvatore d. Morgera department of Electrical Engineering University of South Florida Tampa USA department of Computer Science and Engineering Indian Institute of Technology New Delhi India

This paper derives rigorous statements concerning the propagation velocity of action potentials in axons. The authors use the Green’s function approach to approximate the action potential and find a relation between ... 详细信息

关键词： Neuron Axon Action Potential Conduction Velocity Internode

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Effects of the level and source of dietary physically effective fiber on feed intake, nutrient utilization, heat energy, ruminal fermentation,and milk production by Alpine goats

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Animal Nutrition 2024年第2期17卷 312-324页

作者： Raquel V.Lourencon Amlan K.Patra Luana P.S.Ribeiro Ryszard Puchala Wei Wang Terry A.Gipson arthur L.Goetsch American Institute for Goat Research Langston University

Thirty-two primiparous and 31 multiparous Alpine goats were used to determine influences of diets varying in level and source of forage on performance in early to mid-lactation for 16 wk. diets consisted of 40%, 50%, 60%, and 70% forage(designated as 40F, 50F, 60F, and 70F, respectively) with 60F and 70F containing coarsely ground grass hay(primarily orchardgrass) and 40F and 50F containing cottonseed hulls, alfalfa pellets, and coarsely ground wheat hay. diets contained 15.9% to 16.3% crude protein and37.8%, 42.1%, 53.5%, and 55.4% neutral detergent fiber(NdF) with 10.0%, 15.8%, 50.1%, and 55.5% particle retention on a 19-mm sieve, and 26.1%, 29.6%, 38.3%, and 40.0% physically effective NdF(pe NdF) for 40F,50F, 60F, and 70F, respectively. dry matter intake(2.71, 2.75, 1.96, and 1.95 kg/d) and milk yield(2.82,2.71, 2.23, and 2.10 kg/d for 40F, 50F, 60F, and 70F, respectively) were lower(P diets highest in forage. digestion of organic matter was similar among diets(P > 0.05), but digestibility of NdF was greater(P d 70F(57.5%, 58.4%, 68.9%, and 72.2% for 40F, 50F, 60F, and 70F,respectively). diet affected(P d 2.97%) and protein concentrations(2.62%, 2.69%, 2.58%, and 2.52% for 40F, 50F, 60F, and 70F, respectively). Milk energy yield was greater(P diets lowest in forage(7.51, 7.45, 5.68, and 5.34 MJ/d), although yield relative to dry matter intake was not affected(P > 0.05) by diet and was lower(P d 3.09 MJ/kg). Ruminal p H and acetate proportion were greater for 60F and 70F than for the other diets and the proportion of butyrate was lower for the two diets highest in fiber. The mean lengths of time spent ruminating, eating, standing, and lying were not affected(P > 0.05) by diet or parity, but many interactions involving diet, period, hour, and parity were significant(P < 0.05). In conclusion, lactational performance o

关键词： Physically effective fiber Alpine goat Lactation Ruminal fermentation Feeding behavior

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Unveiling the secrets of diatom-mediated calcification:Implications for the biological pump

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Science China Earth Sciences 2024年第9期67卷 2895-2909页

作者： Yiwen PAN Yifan LI Chen-Tung arthur CHEN Zong-Pei JIANG Wei-Jun CAI Yunwen SHEN Zesheng dING Qixian CHEN Yanan dI Wei FAN Chenba ZHU Ying CHEN Ocean College Zhejiang UniversityZhoushan 316021China Hainan Institute of Zhejiang University Sanya 570203China department of Oceanography Sun Yat-Sen UniversityGaoxiong 80424China School of Marine Science and Policy University of DelawareNewark DE 19716USA Carbon Neutral Innovation Research Center Xiamen UniversityXiamen 361005China

Siliceous diatoms are one of the most prominent actors in the oceans,and they account for approximately 40%of the primary production and particulate organic carbon export *** is believed that changes in carbon flux caused by variations in diatom distribution can lead to significant climate *** the fundamental pathways of diatom-driven carbon sequestration have long been established,there are no reports of CaCO_(3) precipitation induced by marine diatom *** manuscript introduces novel details regarding the enhancement of aragonite precipitation during photosynthesis in Skeletonema costatum in both artificial and natural *** direct measurements of cell surfaces via a pH microelectrode and zeta potential analyzer,it was determined that the diatom-mediated promotion of CaCO_(3) precipitation is achieved through the creation of specific microenvironments with concentrated[CO_(3)^(2-)]and[Ca^(2+)]and/or the dehydrating effect of adsorbed Ca^(2+).Based on this mechanism,it is highly plausible that diatom-mediated calcification could occur in the oceans,an assertion that was supported by the significant deviation of total alkalinity(TA)from the conservative TA-salinity mixing line during a Skeletonema costatum bloom in the East China Sea and other similar *** newly discovered calcification pathway establishes a link between particulate inorganic and organic carbon flux and thus helps in the reassessment of marine carbon export fluxes and CO_(2) sequestration *** discovery may have important ramifications for assessing marine carbon cycling and predicting the potential effects of future ocean acidification.

关键词： diatom bloom Skeletonema costatum Calcification Biological carbon pump Counter carbonate pump

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determination of the Mineral Composition of the Pulp and Evaluation of the Acute Toxicity of the Seeds of Carica papaya L. Consumed in Lubumbashi and Kinshasa in the democratic Republic of the Congo

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Journal of Biosciences and Medicines 2024年第9期12卷 266-279页

作者： Guelord Inkalaba Janvier Arnauld Kiza Magain Mihatano Mathilde Bushiri Furaha arthur duki Olivier Nzingula Armelle Naniwambote Maguy Luvandu Nicole Misengabu désiré Musuyu Fridolin Kodondi Kule-Koto Laboratory of Biochemistry Nutrition and Hematology Faculty of Pharmaceutical Sciences University of Kinshasa Kinshasa Democratic Republic of the Congo Faculty of Pharmaceutical Sciences University of Lubumbashi Lubumbashi Democratic Republic of the Congo Food Technology and Food Analysis Laboratory Faculty of Pharmaceutical Sciences University of Kinshasa Kinshasa Democratic Republic of the Congo Higher Institute of Medical Techniques Nutrition and Dietetics Section Kinshasa Democratic Republic of the Congo Laboratory of the National Institute of Biomedical Research (NIBR) Kinshasa Democratic Republic of the Congo

This work aimed, on the one hand, to determine the mineral and phytochemical composition of Carica papaya in order to guarantee the food safety of consumers and on the other hand, to evaluate the acute toxicity of papaya seeds. The papayas were bought at the Mzée market in Lubumbashi and Selembao in Kinshasa. Fruit sampling was done according to the ISO 7002 standard on agricultural and food products;the papayas were firm, mature, and without stains or physical damage. The analysis results of the papaya pulp showed both for the samples from the city of Lubumbashi and for the city province of Kinshasa that it contains respectively 85.87% and 84.46% water, 0.59% and 0.53% ash content. The mineral evaluation of our two samples presented a potassium content of 200 ± 8 mg, magnesium 13.12 ± 3 mg, calcium 22.15 ± 2 mg, sodium 3 mg ± 0.5 for the sample from Lubumbashi and 192.32 ± 8 mg of potassium, 14.458 ± 3 mg of magnesium, 20.58 ± 2 mg of calcium and 3.58 ± 0.5 mg of sodium for the sample from Kinshasa in macroelements. Concerning the trace elements, after analysis, we found zinc content (0.29 ± 0.1 mg and 0.12 ± 0.1 mg), copper (0.02 ± 0.01 mg and 0.14 ± 0.01 mg), and iron (2.22 ± 0.5 mg and 2.04 ± 0.5 mg) respectively for Lubumbashi and Kinshasa. The chemical screening indicates the presence of alkaloids, saponosides, tannins catechics, flavonoids and anthocyanins in the palm wine and ethanolic extract of the seeds of Carica papaya and an absence of cyanogenic glycosides and gallic tannins. With mild toxicity, the seeds of the fruit of Carica papaya L. can be used with moderate risk by the population.

关键词： Carica papaya Mineral Composition Acute Toxicity

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description of Post-Stroke Cognitive disorders at Abidjan University Hospitals, Côte d’Ivoire

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Neuroscience & Medicine 2024年第2期15卷 92-105页

作者： N’guessan N’cho arthur Kouassi Kouamé Léonard Ouattara Niemtiah Tako Neme Antoine Biology and Health Laboratory Felix Houphout-Boigny University Abidjan Cte dIvoire department of Neurology CHU Yopougon Felix Houphout-Boigny University Abidjan Cte dIvoire

Stroke patients often experience motor deficits and cognitive problems after a stroke. Objective: To improve our understanding of the cognitive consequences of stroke. Method: a descriptive and analytical cross-sectional study was conducted over 12-month period in the neurology departments of the Cocody and Treichville Hospitals in Côte d’Ivoire. Results: Out of 724 patients admitted to the neurology department, 415 (57.32%) were stroke patients, of which 145 (34.94%) were screened. The frequency of global cognitive functioning impairment was 86.21%, significantly higher than the frequency of patients without impairment, which was 13.79%. The study focused on detailing the cognitive status of stroke patients in neurology departments, assessing several cognitive functions during the subacute phase of stroke. These functions included global cognitive functioning, executive functions, language and memory. The frequency of post-stroke cognitive impairment is high among stroke patients in Abidjan. This frequency is comparable to figures found in Subsaharian stroke populations. demographic and clinical characteristics studied included age, gender, education level, employment status, vascular diseases and cerebral affected area. Among these characteristics, only the education level and the cerebral affected area have been found significant. Conclusion: The incidence of cognitive impairment after a stroke is significantly high among stroke patients in Abidjan.

关键词： Cognitive disorders Subacute Stroke Related Risk Factors

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Outcomes of Hemodialysis Patients in Public Centres in Abidjan from September 2018 to October 2021: data from the Renal Registry of Cote d’Ivoire

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Open Journal of Nephrology 2024年第3期14卷 413-426页

作者： Sery Patrick diopoh arthur Kanganga Serge didier Konan Kolo Claude Ouattara Marie-dominique Kouadio Mohamed Alex Moudachirou Kouamé Hubert Yao department of Medicine and Medical Specialties University Flix Houphout-Boigny Abidjan Cote dIvoire National Centre for Prevention and Treatment of Renal Failure Abidjan Cte dIvoire

Background: Hemodialysis is the most widely used renal replacement therapy in developing countries such as Cote d’Ivoire. Objective: To study the outcome of chronic hemodialysis patients in public centres in Abidjan using data from the Renal Registry of Cote d’Ivoire (2RCI). Method: This was a prospective analytical cohort study of End Stage Kidney disease (ESKd) patients undergoing iterative hemodialysis in the network of public hemodialysis centres in Abidjan and who had been registered in the 2RCI register by September 2018. Results: Our study involved 363 cases out of 379 patients registered in the 2RCI registry database in 2018. The mean age of the patients was 47.3 ± 12.1 years, with a male predominance (sex ratio 1.97). In 70.24% of cases, they had no health insurance. The average duration of dialysis for our patients was 6.94 ± 4.1 years, with extremes of 2 and 28 years. This duration was less than 5 years in 44.3% of cases, between 6 and 10 years in 42.9% and more than 10 years in 12.6% of cases. The comorbidities found were hypertension in 95.6% of cases, diabetes in 7.8% and HIV in 4.6%. Anemia was found in 68% of cases and stroke in 8.6%. during the study period, 161 deaths were observed, representing a mortality rate of 44.35%. Acute lung oedema (29.8%), stroke (6.8%) and other cardiovascular diseases (19.3%) were the main causes of death. In multivariate analysis, factors such as age ≥ 65 years (HR = 3.66;CI 95% = 1.55 - 8.67;p = 0.003), “married/coupled” status (HR = 2.02;CI 95% = 1.24 - 3.31;p = 0.005) and normal weight at the start of dialysis (OR = 9.59, CI95% = 4.19 - 21.95;p = 0.001) were associated with the risk of death. Conclusion: Hemodialysis is performed in Abidjan on young patients. The mortality rate after three years of dialysis is very high. Hence the need to pursue the policy of decentralizing public centres and optimizing access to dialysis in terms of quality and quantity in order to improve patient survival.

关键词： Chronic Hemodialysis death Renal Registry Cote d’Ivoire

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An epigenetic perspective on the failing heart and pluripotent-derived-cardiomyocytes for cell replacement therapy

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Frontiers in Biology 2015年第1期10卷 11-27页

作者： Joshua d. TOMPKINS arthur d. RIGGS department of diabetes and Metabolic disease Research Beckman Research Institute/City of Hope National Medical Center 1500 E DuarteRoad Duarte CA 91010 USA

As life expectancy rises, the prevalence of heart failure is steadily increasing, while donors for organ transplantation remain in short supply （Zwi-dantsis and Gepstein, 2012）. Indeed, myocardial infarction represents the foremost cause of death within industrialized nations （Henning, 2011） and further, approximately 1% of all newborns harbor a congenital heart defect. Although medical interventions allow 〉 80% of those with cardiac defects to survive to adulthood, there are often extreme emotional and financial burdens that accompany such congenital anomalies, and many individuals will remain at a heightened risk for myocardial infarction throughout the remainder of their lives （Verheugt et al., 2010; Amianto et al., 2011）. In this review, we will discuss the nature of the failing heart and strategies for repair from an epigenetic standpoint. Significant focus will reside on pluripotent-to-cardiomyocyte differentiation for cell replacement, epigenetic mechanisms of cardiomyocyte differentiation, epigenetic ＂memories,＂ and epigenetic control of cardiomyocyte cell fate toward translational utility.

关键词： heart failure pluripotent cardiomyocytes epigenetics dNA methylation lncRNA

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Computational and experimental study on corrosion inhibition potential of the synergistic 1:1 combination of Arabic and cashew gums on mild steel

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Petroleum Research 2020年第2期5卷 170-180页

作者： david Ebuka arthur department of Chemistry Base UniversityAbujaNigeria

The synergistic study of Acacia Senegal (arabic gum) and Anacardium occidentale (cashew gum) combination in corrosion inhibition of mild steel was carried out to determine the inhibition efficiency of their combination. The gums were purified using standard methods and the blend prepared using the method as described by Femi – Oyewo et al. The blend was then used for corrosion study at two temperatures (303 K and 333 K) and the corrosion rates calculated. The adsorption process was found to satisfy the Langmuir isotherm and hence the sorption study reveals that the interaction is a physical one since the free energy of adsorption (ΔG^(o) ads kJ/mol) is given as (−16.47 and −15.61) kJ/mol at temperature T = 303 K and 333K accordingly. The GCMS technique was used to characterize the blend, five chemical compounds and their area percentage [6-O-(1-L-maloyl)-alpha-,beta-d-Glcp (veracylglucan A) (22.11%), 6-Octadecanoic acid (55.76%), Methylhexadecanoate (3.97%), 1-Pentadecane carboxylic acid (10.78%) and 9, 12-Octadecadienoic acid (7.38%)] were identified and subjected to computation corrosion study, the binding energy for the constituents of the blend on Fe surface were computed using Accelrys Material Studio and the mean values were found to be −327.097 kJ/mol, −446.943 kJ/mol, −602.826 kJ/mol, −608.625 kJ/mol and −693.749 kJ/mol respectively.

关键词： Arabic gum Cashew gum Synergy dFT Corrosion

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山塘街一年 24小时

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国际人才交流 2022年第10期 50-53页

作者：苏平(图/文) 张佳艺(译) 不详

山塘街位于江苏省苏州古城西北,东至红尘中“一二等富贵风流之地”阊门,西至“吴中第一名胜”虎丘,全长约3600米,约合7华里,故称“七里山塘到虎丘”。山塘街始建于公元825年,距今已有近1200年的历史,景区人文景观丰富、历史底蕴深厚,被... 详细信息

山塘街位于江苏省苏州古城西北,东至红尘中“一二等富贵风流之地”阊门,西至“吴中第一名胜”虎丘,全长约3600米,约合7华里,故称“七里山塘到虎丘”。山塘街始建于公元825年,距今已有近1200年的历史,景区人文景观丰富、历史底蕴深厚,被誉为“老苏州的缩影、吴文化的窗口”。我1980年出生于美国,现居苏州。

关键词：人文景观苏州古城虎丘山塘街

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