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Topology-enhanced mechanical stability of swelling nanoporous electrodes

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npj Computational Materials 2023年第1期9卷 1161-1175页

作者： Benjamin E.Grossman-Ponemon Ataollah Mesgarnejad alain Karma Center for Interdisciplinary Research on Complex Systems Department of PhysicsNortheastern UniversityBostonMA 02115USA School of Engineering Brown UniversityProvidenceRI 02912USA

Materials like silicon and germanium offer a 10-fold improvement in charge capacity over conventional graphite anodes in lithium-ion batteries but experience a roughly threefold volume increase during lithiation,which challenges ensuring battery *** silicon,created by liquid-metal-dealloying,is a potentially attractive anode design to mitigate this challenge,exhibiting both higher capacity and extended cycle ***,how nanoporous structures accommodate the large volume change is ***,we address this question by using phase-field modeling to produce nanoporous particles and to investigate their elastoplastic swelling behavior and *** simulations show that enhanced mechanical stability results from the network topology consisting of ligaments connected by bulbous,sphere-like *** ligaments forcefully resist elongation while the nodes,behaving like isolated spherical particles,experience large stresses driving ***,being smaller compared to a sphere of the same volume as the entire nanoporous particle,the nodes are more protected against fracture.

关键词： swelling stability attractive

Towards high-efficiency of hydrogen purification in metal hydride

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Progress in Natural Science:Materials International 2023年第3期33卷 301-308页

作者： Koua alain Jesus Koua Jiahe Peng Arramel Arramel Neng Li State Key Laboratory of Silicate Materials for Architectures School of Materials Science and Engineering Wuhan University of Technology Shenzhen Research Institute of Wuhan University of Technology Nano Center Indonesia Jalen Raya PUSPIPTEK South Tangerang School of Chemistry and Environmental Engineering School of Environmental Ecology and Biological Engineering Novel Catalytic Materials of Hubei Engineering Research Center Wuhan Institute of Technology

Recent advancement on hydrogen(H2) retrieval in a mixture gas of H2/CO2based on the metal hydride(MH)technique has attracted numerous interests. In this work, we implement the lumped element model simulation to conduct a theoretical approach on the hydrogen purification process. The influence of orifice geometry and temperature of the tank, and inflow gas rate(fin) is investigated. The results show that the discharge coefficient(DC) is affected by the tank’s orifice geometry. The orifice shape is increasing the value of DC, as a result, the CO2(impurity) outflow rate heightens during the venting process and thereby promoting to obtain a high hydrogen purity. By overcoming the exothermic/endothermic effect in the absorption/desorption step and a proper finselection, we find an improvement in the hydrogen storage capacity(wt%) into MH and consequently the hydrogen recovery rate increases. A sharp improvement in orifice geometry and thermal conditions of the tank,and finenhances the main targeted results(hydrogen purity and recovery rate) and ensures the proper operation of the MH technique.

关键词： Hydrogen purification Metal hydride Discharge coefficient Lumped model simulation Carbon dioxide

Evaluating organic acids as alternative leaching reagents for rare earth elements recovery from NdFeB magnets

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Journal of Rare Earths 2023年第4期41卷 621-631页

作者： Sahar Belfqueh alain Seron Simon Chapron Guilhem Arrachart Nourredine Menad BRGM Direction de l'Eaude l'Environnementdes Procédés et AnalysesOrleansFrance ICSM Univ.MontpellierCEACNRSENSCMMarcouleFrance

This study proposes an advanced leaching method using organic acids to recover rare earth elements(REEs)from NdFeB permanent magnets from end-of-life computers hard disk drives(HDDs).The end-oflife HDDs were first dismantled in order to recover NdFeB magnets,which were then thermally demagnetized at 350℃during 30 min before crushing in a ball mill under inert *** electron microscopy/energy dispersive X-ray spectroscopy(SEM/EDS)analyses performed on the NdFeB magnets show the heterogeneous structure containing the major matric phase Nd_(2)Fe_(14)B and the REEsrich phase containing Nd and Pr ***,X-ray diffraction(XRD)and Mossbauer spectroscopy(MS)analyses on the ground NdFeB magnet show that grinding NdFeB magnets under inert atmosphere helps to minimize its *** analysis shows that the composition of the ground sample is Nd:22.8 wt%,Pr:3.3 wt%,Dy:1.2 wt%,Fe:62.6 wt%,Co:1.5 wt%,B:0.9 wt%,Ni:0.6 wt%.Diagrams of speciation and equilibrium phases(E_(h) ***)were calculated to determine the predominance of the formed species in the REEs-organic acids *** influence of the organic acid type(acetic acid,formic acid,citric acid and tartaric acid),the acid concentration(10 vol%,up to saturation),and the solid/liquid(S/L)ratio(0.5%-10%)on NdFeB magnets leaching was investigated employing an optimal experimental design conceived by the statistical software *** acid(CH_(3)COOH)shows the highest leaching performance of REEs,allowing leaching yields over 90%for Nd,Dy and Pr in the acid concentration range of 1.6-10 mol/L and the S/L ratio range of 0.5%-5%at a temperature of 60℃.The results presented in this investigation suggest that REEs can be recovered from magnets of end-of-life HDDs using an eco-friendly method assisted by organic acids.

关键词： NdFeB magnets Rare earth elements Leaching Organic acids Acetic acid

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Urological Emergencies at the University Hospital of Brazzaville: Epidemiological, Clinical, and Therapeutic Aspects

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Open Journal of Urology 2024年第5期14卷 333-345页

作者： Roland Bertile Banga-Mouss Yannick Dimi Nyanga Irène Ondima Armel Melvin Atipo Ondongo Steve Aristide Ondziel-Opara Joseph Junior Damba Nick Arnaud Monabeka Christ Ondzé Daniella Gloire Ngassiele Gidmard Onguele Henock Songa Jetsvy Mayala Anani Wensels Severin Odzebe Prosper alain Bouya Departement of Urology and Andrology University Hospital of Brazzaville Brazzaville Republic of the Congo

Introduction: Urological emergencies play a significant role in the medical and surgical activity of a urology department. The objective of this study was to determine the hospital prevalence of urological emergencies at the University Hospital of Brazzaville (CHUB), identify the different pathologies requiring urgent care, and list the various therapeutic methods. Patients and methods: A retrospective study of patients admitted to the medical and surgical emergencies department of CHUB over a 5-year period. Patient records admitted and treated for a urological emergency were included. The variables studied were the frequency of urological emergencies, patient age at admission, gender, nature of the emergency, and various therapeutic options. Results: Urological emergencies accounted for 4.3% of all medical and surgical emergencies. The mean age was 57 ± 28 years with a range of 3 to 93 years. The male-to-female ratio was 7.1. The most common conditions were urinary retention (54.67%), hematuria (17.20%), and renal colic (8.13%). Therapeutically, surgical urinary drainage was dominated by cystostomy. Conclusion: Urological emergencies are infrequent at the University Hospital of Brazzaville. Their management is often delayed.

关键词： Urological Emergencies Urinary Retention Hematuria Renal Colic

Lead-free textured piezoceramics using tape casting:A review

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Journal of Materiomics 2018年第4期4卷 277-303页

作者： alain D.Moriana Shujun Zhang ISEM Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia Defence Materials Technology Centre 24 Wakefield StreetHawthornVIC3122Australia

In this review,the evolution of textured lead-free piezoceramics has been explored,primarily focusing on the technique of templated grain growth(TGG)and reactive-templated grain growth(RTGG),as an alternative to single *** mechanics and properties of using template in guiding and orienting the ceramic grains into the same crystal orientation allow for piezoelectric properties approaching those of their single-crystal *** fabrication process was surveyed in depth,with focus placed on the tape casting process and numerous variables associated with aligning the template seeds in the ceramic *** piezoelectric and ferroelectric properties of the textured ceramics are supposed to be a function of all parameters(tape casting,slurry formation,sintering profile,template properties)in an effort to determine the significance of their contributions to the properties.

关键词： Piezoelectric Textured Tape casting Template Lead-free

On the size of the intersection of two Lucas sequences of distinct type Ⅱ

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Science China Mathematics 2011年第7期54卷 1299-1316页

作者： CIPU Mihai MIGNOTTE Maurice TOGB alain Institute of Mathematics of the Romanian Academy Bucharest RO-014700 Romania U. F. R. de Mathmatiques Universit de Strasbourg Strasbourg 67084 France Department of Mathematics Purdue University North Central Westville IN 46391 USA

Let a and b be positive integers, with a not perfect square and b > 1. Recently, He, Togband Walsh proved that the Diophantine equation x2-a((bk-1)/(b-1))2=1 has at most three solutions in positive integers. Moreover, they showed that if max{a,b} > 4.76·1051, then there are at most two positive integer solutions (x,k). In this paper, we sharpen their result by proving that this equation always has at most two solutions.

关键词： Diophantine equation exponential equation linear forms in logarithms

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Malignant peritoneal effusion acting as a tumor environment in ovarian cancer progression: Impact and significance

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World Journal of Clinical Oncology 2018年第8期9卷 167-171页

作者： alain Piché Département de Microbiologie et Infectiologie Faculté de Médecine Université de Sherbrooke

Until recently, ovarian cancer research has mainly focused on the tumor cells themselves ignoring for the most part the surrounding tumor environment which includes malignant peritoneal effusions. However, one of the major conceptual advances in oncology over the last few years has been the appreciation that cancer progression cannot be explained by aberrations in cancer cells themselves and is strongly influenced by the surrounding tumor environment. The mechanisms of ovarian cancer progression differ from that of other solid tumors because ovarian cancer cells primarily disseminate within the peritoneal *** peritoneal effusion accumulates in the peritoneal cavity during ovarian cancer progression. These exudative fluids act as a unique tumor environment providing a framework that orchestrates cellular and molecular changes contributing to aggressiveness and disease progression. The composition of ascites, which includes cellular and acellular components, constantly adapts during the course of the disease in response to various cellular cues originating from both tumor and stromal cells. The tumor environment that represents peritoneal effusions closely constitute an ecosystem, with specific cell types and signaling molecules increasing and decreasing during the course of the disease progression creating a single complex network. Although recent advances aiming to understand the ovarian tumor environment have focused one at a time on components, the net impact of the whole environment cannot be understood simply from its parts or outside is environmental context.

关键词： Ovarian cancer Tumor environment Peritoneal effusions Ascites Dissemination Multicellular spheroids

Microorganisms from deep-sea hydrothermal vents

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Marine Life Science & Technology 2021年第2期3卷 204-230页

作者： Xiang Zeng Karine alain Zongze Shao Key Laboratory of Marine Biogenetic Resources Third Institute of OceanographyMinistry of Natural ResourcesXiamen361005China Laboratoire de Microbiologie des Environnements Extrêmes LM2E UMR6197 Univ BrestCNRSIFREMERF-29280PlouzanéFrance LIA/IRP 1211 MicrobSea Sino-French International Laboratory of Deep-Sea Microbiology29280PlouzanéFrance

With a rich variety of chemical energy sources and steep physical and chemical gradients,hydrothermal vent systems offer a range of habitats to support microbial ***-dependent and independent studies have led to an emerging view that diverse microorganisms in deep-sea hydrothermal vents live their chemolithoautotrophic,heterotrophic,or mixotrophic life with versatile metabolic *** processes are mediated by microorganisms,and notably,processes involving or coupling the carbon,sulfur,hydrogen,nitrogen,and metal cycles in these unique ***,we review the taxonomic and physiological diversity of microbial prokaryotic life from cosmopolitan to endemic taxa and emphasize their significant roles in the biogeochemical processes in deep-sea hydrothermal *** to the physiology of the targeted taxa and their needs inferred from meta-omics data,the media for selective cultivation can be designed with a wide range of physicochemical conditions such as temperature,pH,hydrostatic pressure,electron donors and acceptors,carbon sources,nitrogen sources,and growth *** application of novel cultivation techniques with real-time monitoring of microbial diversity and metabolic substrates and products are also recommended.

关键词： Deep-sea hydrothermal vents Cultivation Diversity Biogeochemical cycle

Clinical development update: 1st dengue vaccine candidate

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Asian Journal of Pharmaceutical Sciences 2016年第1期11卷 20-21页

作者： alain Bouckenooghe Sanofi Pasteur

A candidate tetravalent dengue vaccine is being assessed in three clinical trials involving more than 35,000 children between the ages of 2 and 16 years in the Asia-Pacific and Latin American *** report the results of long-term follow-up interim analyses and integrated efficacy *** are assessing the incidence of hospitalization for virologically confirmed dengues a surrogate safety end point during follow-up in years 3–6 of two phase 3 trials,CYD14 and CYD15,and a phase 2b trial,CYD23/*** estimated vaccine efficacy using pooled data from the first 25 months of CYD14 and CYD15.

关键词： Dengue vaccine Candidate tetravalent dengue vaccine

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