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Cadmium sorption by sodium and thiourea-modified zeolite-rich tuffs

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Journal of Environmental Sciences 2017年第2期29卷 39-48页

作者： Perfecto Barragán P m.Guadalupe macedo m maria T.Olguín Instituto Tecnologico de Toluca Laboratorio de Investigacion en Ingenieria Ambiental.Av.Tecnologico S/NColonia Ex-Rancho La VirgenMetepecEstado de Meico CP.52140Mexico Instituto National de Investigaciones Nucleares Departamento de QuimicaA.P.18-1027Col.EseandonDelegacion Miguel Hidalgo C.P.11801Mexico

In the present investigation, two zeolite-rich tuffs from Guaymas and El Cajon（State of Sonora）, which were conditioned with a sodium chloride solution and subsequently modified with a thiourea solution, were chosen to evaluate the removal of Cd from aqueous systems. The zeolitic materials were characterized by scanning electron microscopy and X-ray diffraction. The surface area was also determined. The experiments were performed in a batch system, and the influences of p H, contact time between phases, and the concentration of Cd in the solution on the adsorption by sodium or thiourea-modified zeolite-rich tuff were investigated. It was found that the efficiency of Cd ion removal from aqueous solutions is influenced by the p H of the aqueous systems. The Cd adsorption kinetic data were well fitted to a pseudo-second-order model in all cases. The Langmuir and Langmuir–Freundlich isotherms adequately described the Cd sorption behavior by the zeolite from El Cajon pretreated with Na Cl and the zeolite from Guaymas modified with thiourea, respectively.

关键词： Cadmium Zeolite-rich-tuff Sorption Kinetics Isotherms

Geotechnical particle finite element method for modeling of soilstructure interaction under large deformation conditions

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Journal of Rock mechanics and Geotechnical Engineering 2022年第3期14卷 967-983页

作者： Josep maria Carbonell Lluís monforte matteo O.Ciantia marcos Arroyo Antonio Gens mECAmAT Group Department of EngineeringFaculty of Science and TechnologyUniversitat de Vic-Universitat Central de Catalunya(UVic-UCC)VicSpain Centre Internacional de mètodes Numèrics a l'Enginyeria(CImNE) BarcelonaSpain School of Science and Engineering University of DundeeDundeeUK Universitat Politècnica de Cataluna-BarcelonaTech BarcelonaSpain

The possibilities of the particle finite element method(PFEm)for modeling geotechnical problems are increasingly *** is a numerical approach to solve large displacement and large strain continuum problems that are beyond the capabilities of classical finite element method(FEm).In PFEm,the computational domain is reconfigured for optimal solution by frequent remeshing and boundary *** inherits many concepts,such as a Lagrangian description of continuum,from classic geomechanical *** familiarity with more popular numerical methods facilitates learning and *** work focuses on G-PFEm,a code specifically developed for the use of PFEm in geotechnical *** article has two *** first is to give the reader an overview of the capabilities and main features of the current version of the G-PFEm and the second is to illustrate some of the newer developments of the code.G-PFEm can solve coupled hydro-mechanical static and dynamic problems involving the interaction of solid and/or deformable *** constitutive models for geomaterials are available,including features,such as structure and destructuration,which result in brittle *** solutions are robust,solidly underpinned by numerical technology including mixedfield formulations,robust and mesh-independent integration of elastoplastic constitutive models and a rigorous and flexible treatment of contact *** novel features presented in this work include the contact domain technique,a natural way to capture contact interactions and impose contact constraints between different continuum bodies,as well as a new simplified formulation for dynamic impact *** code performance is showcased by the simulation of several soil-structure interaction problems selected to highlight the novel code features:a rigid footing insertion in soft rock,pipeline insertion and subsequent lateral displacement on over-consolidated clay,screw-pile pull-out and the dyn

关键词： Particle finite element method(PFEm) Structured soils Nonlocal elastoplasticity Contact domain method Soil penetration problems

Immunosuppressive regimens and outcomes of inflammatory bowel disease patients requiring kidney transplantation

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World Journal of Transplantation 2022年第2期12卷 21-23页

作者： Urvashi Singh Baljit Singh maria Irene Bellini Department of Surgery Wythenshawe HospitalManchester University Hospitals NHS Foundation TrustManchester M239LTUnited Kingdom Department of Colorectal Surgery University Hospitals LeicesterLeicester LE15WWUnited Kingdom Department of Surgical Sciences Sapienza UniversityRoma 00161Italy

Patients with inflammatory bowel disease(IBD)can develop extra-renal complications and as a result,suffer from end stage renal failure requiring kidney transplantation(KT).A brief review of available literature revealed that IBD patients undergoing KT have shorter overall survival rates compared to their *** reporting steroid regimens and survival outcomes specific to IBD and post kidney transplant are scarce and these studies have small sample sizes thus making it difficult to draw accurate *** research is required in the form of a randomized controlled study to clarify the effect and mechanism of steroid immunosuppression on the prognosis of renal transplant recipients and explore new treatment schemes.

关键词： Inflammatory bowel disease Kidney transplantation Steroids Immunosuppression Kidney failure Ulcerative colitis Crohn’s disease

From landslide characterization to nature reserve management:The“Scialimata Grande di Torre Alfina”landslide Geosite(Central Apennines,Italy)

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山地科学学报（英文） 2023年第3期20卷 585-606页

作者： Gianluca TRONTI Francesca VERGARI Irene maria BOLLATI Filippo BELISARIO maurizio DELmONTE manuela PELFINI Paola FREDI Earth Sciences Department"Ardito Desio" University La StataleMilan 20133(MI)Italy monte Rufeno Nature Reserve Acquapendente 01021(VT)Italy Earth Sciences Department University La SapienzaRome 00185(RM)Italy

Italy is characterized by widespread geomorphological instability,among which landslides leave impressive marks on the ***,landslide bodies may represent key sites for thematic and educational itineraries,especially in protected areas,where their management becomes an important *** study focuses on the"monte Rufeno Nature Reserve"(Central Apennines,Italy),where iconic landslides are ***,the"Scialimata Grande di Torre Alfina"landslide(SGTA)is listed in the regional Geosite *** work aims to propose a multiscale procedure for landslide analysis,in terms of both hazard sources but also educational and geoheritage enhancement opportunities in natural *** performing a Landslide Susceptibility conditional Analysis(LSA)for the reserve territory,attention was focused on the SGTA,to define properly its features and morphodynamics.A multi-disciplinary approach was adopted,by applying both remote sensing(UAV structure from motion,Photointerpretation)and field survey(geomorphological and GPS monitoring).From the LSA,based on drainage density,curvature,and slope triggering factors,the road and trail susceptibility maps were derived,as base tools for future risk assessments and trail paths management within the *** the SGTA scale,the monitoring showed a displacement of up to 23 m during the time interval between 2015 and *** landslide dynamics seem to be driven by alternating dry and extremely wet periods;moreover,leaks from the aqueduct in the detachment area and piping effects through clays may have also decreased the substrate *** SGTA complex influence on the Paglia River valley geometry was also hypothesized,underlining the action of landslide through different spatial scales(on-site and off-site)and on different environment features(sediment connectivity,hydrology).Finally,the SGTA appears highly representative of the geomorphic dynamics within the Nature Reserve(i.e.,scientific value)and it could be

关键词： Landslides Geoheritage Geosites Nature reserves management UAV structure from motion Landslides conditional analyses

Recent advances in phosphoric acid-based membranes for high-temperature proton exchange membrane fuel cells

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Journal of Energy Chemistry 2021年第12期30卷 393-429,I0010页

作者： Zunmin Guo maria Perez-Page Jianuo Chen Zhaoqi Ji Stuart m.Holmes Department of Chemical Engineering and Analytical Science The University of Manchester.Ml39PLUnited Kingdom

High-temperature proton exchange membrane fuel cells(HT-PEmFCs)are pursued worldwide as efficient energy conversion *** efforts have been made in the area of designing and developing phosphoric acid(PA)-based proton exchange membrane(PEm)of *** review focuses on recent advances in the limitations of acid-based PEm(acid leaching,oxidative degradation,and mechanical degradation)and the approaches mitigating the membrane *** multilayer or polymers with continuous network,adding hygroscopic inorganic materials,and introducing PA doping sites or covalent interactions with PA can effectively reduce acid *** oxidative degradation can be alleviated by synthesizing crosslinked or branched polymers,and introducing antioxidative groups or highly oxidative stable *** to get a compact structure,blending with stable polymers and inorganic materials,preparing polymer with high molecular weight,and fabricating the polymer with PA doping sites away from backbones,are recommended to improve the membrane mechanical ***,by comparing the running hours and decay rate,three current approaches,*** via thermally curing or polymeric crosslinker,*** hygroscopic inorganic materials,*** membrane layers or introducing strong basic groups and electron-withdrawing groups,have been concluded to be promising approaches to improve the durability of *** overall aim of this review is to explore the existing degradation challenges and opportunities to serve as a solid basis for the deployment in the fuel cell market.

关键词： High-temperature proton exchange membrane fuel cells Acid leaching Oxidative degradation mechanical degradation Durability

Clinical outcomes and complications of single anastomosis duodenal-ileal bypass with sleeve gastrectomy:A 2-year follow-up study in Bogotá,Colombia

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World Journal of Clinical Cases 2023年第21期11卷 5035-5046页

作者： Andres Ospina Jaramillo Angie Carolina Riscanevo Bobadilla mariana Ospina Espinosa Alvaro Valencia Humberto Jiménez maria del Pilar montilla Velásquez maria Bastidas Department of General Surgery Clínica Reina SofiaColsanitasBogotáD.C 110151Colombia Department of General Surgery Fundación Universitaria SanitasBogotáD.C 11162Colombia Department of General Surgery Universidad del RosarioBogotá110151Colombia Department of Epidemiology Fundación Universitaria SanitasBogotá110151Colombia

BACKGROUND The global prevalence of obesity has increased over the past 40 years,and bariatric surgery has proven to be the most effective therapy for long-term weight *** principles are based on modifying the brain-gut axis by altering the gastrointestinal anatomy and affecting the function of gastrointestinal hormones,thereby modifying satiety *** anastomosis duodeno-ileal bypass with sleeve gastrectomy(SADI-S)combines both techniques and has become an alternative to gastric bypass and biliopancreatic diversion procedures for treating severe obesity and associated metabolic diseases in selected *** To describe the outcomes and complications of *** We retrospectively analyzed the data of patients who underwent SADI-S laparoscopically at the Clínica Reina Sofía in Bogotá,*** study assessed the therapeutic effectiveness of SADI-S in terms of short-term preoperative clinical characteristics,postoperative complications,comorbidities,nutritional deficiencies,and intraoperative complications during a 2-year *** Sixty-one patients with a mean body mass index(BmI)of 50±7.1 kg/m2 underwent laparoscopic *** mean operative time and hospital stays were 143.8±42 min and 2.3±0.8 d,*** mean follow-up period was 18 mo,and the mean BmI decreased to 28.5±12.2 kg/*** excess BmI loss was 41.8%±13.5%,and the weight loss percentage was 81.1%±17.0%.Resolution of obesity-related comorbidities,including type 2 diabetes mellitus,hypertension,dyslipidemia,and obstructive sleep apnea,was achieved and defined as complete or partial *** intraoperative complications were ***-term complications were observed in four(6.8%)***,larger studies with longer follow-up periods are required to draw definitive *** SADI-S has a low intraoperative and postoperative complication rate and is effective for weight loss and improving obesity-related comorbidities,including hyperte

关键词： Extreme obesity Bariatric surgery Body mass index metabolic syndrome Cardiovascular diseases Complications

Propranolol hydrochloride degradation using La@TiO_(2) functionalized with CmCD

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Journal of Rare Earths 2022年第4期40卷 579-585,I0003页

作者： Gustavo Lopes Colpani Vitor Follmann Santos Rubieli Carla Frezza Zeferino micheli Zanetti Josiane maria muneron de mello Luciano Luiz Silva Natan Padoin Regina de Fatima Peralta muniz moreira márcio Antônio Fiori Cíntia Soaresc Post-Graduate Program in Technology and Innovation management Community University of ChapecóRegionChapecó89809-900Brazil Department of Chemical Engineering Community University of ChapecóRegionChapecó89809-900Brazil Laboratory of materials and Scientific Computing(LabmAC) Department of Chemical and Food EngineeringFederal University of Santa CatarinaFlorianópolis88040-900Brazil

Propranolol hydrochloride can be considered a persistent and bioaccumulative pharmaceutical in the *** drug and its by-products are potentially toxic and have adverse effects,since these compounds have been associated with endocrine-disrupting effects,reproductive deficiencies,embryo abnormalities and pericardial ***_(2)–La 0.05%–carboxymethyl-β-cyclodextrin(CmCD)nanoparticles were successfully prepared by a simple two-step method,which consists of sonification and *** characterization analyses reveal that lanthanum is dispersed on the semiconductor surface,probably forming Ti–O–La bonds,which can induce oxygen vacancies and surface defects that effectively restrain the recombination of photogenerated electron/holes *** efficiency of TiO_(2)–La 0.05%–CmCD samples in degradation of propranolol under UV-light irradiation is higher than that of pristine TiO_(2) within 20 min reaction,probably due to complex formation between theβ-blocker and the oligosaccharide,which allows us to propose a photocatalytic mechanism based on the formation of intermediates and competition of these compounds to the radicals and CmCD cavities.

关键词： TiO_(2) Lanthanum CmCD Propranolol Photocatalysis Functionalization

Analysis of genetic relationship among Arbutus unedo L. genotypes using RAPD and SSR markers

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Journal of Forestry Research 2013年第2期24卷 227-236页

作者： Filomena Gomes Rita Costa maria m. Ribeiro Elisa Figueiredo Jorge m. Canhoto CERNAS Departamento Florestal Escola Superior Agrária Coimbra INRB Instituto Nacional de Recursos Biológicos Departamento de Recursos Naturais e Desenvolvimento Sustentável Escola Superior Agrária Centre of Functional Ecology Department of Life Sciences University of Coimbra

The strawberry tree （Arbutus unedo L.） is an underutilized, drought tolerant, fire resistant species with a south western distribution in Europe, and with ecological and putative socio-economical impact in Portugal and mediterranean countries. Our aim was to develop an appropriate set of molecular markers to enable genetic diversity to be assessed and to fingerprint Arbutus unedo genotypes for breeding and conservation purposes in Portugal. Twenty-seven trees from a broad geographic range were screened with 20 random amplified polymorphic DNA （RAPD primers） and 11 microsatellite markers （SSR）. The RAPDs generated 124 bands, 57.3% of which were polymorphic, with an expected heterozygosity of 27%. We cross-amplified 11 SSR primers developed for Vaccinium spp., and 5 were found to be polymorphic in A. unedo, with 75% of expected heterozygosity, a number of alleles of 11.6, a null allele frequency of 7.6% and a polymorphic information content of 71%. Although the SSRs were more polymorphic and informative than the RAPDs, both markers displayed high genetic variability with the gathered data. No geographic pattern was observed in the genetic variation distribution based on both marker systems, and the lack of correlation between genetic and geographical matrices was confirmed by mantel tests. Likely, no correlation was found between pairwise SSR and RAPD band-sharing matrices. These results and their implications on A. unedo breeding and conservation programs are discussed.

关键词： Ericaceae fingerprinting geographic pattern molecular markers strawberry tree.

Incorporation of LDH nanocontainers into plasma electrolytic oxidation coatings on mg alloy

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Journal of magnesium and Alloys 2023年第4期11卷 1236-1246页

作者： Yan Li Xiaopeng Lu maria Serdechnova Carsten Blawert mikhail L.Zheludkevich Kun Qian Tao Zhang Fuhui Wang Shenyang National Laboratory for materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute of materials Research Faculty of EngineeringUniversity of KielKaiserstraβe 2Kiel 24143Germany School of materials Science and Engineering Southeastern UniversityNanjing 211189China

In-situ incorporation of layered double hydroxides(LDH)nanocontainers into plasma electrolytic oxidation(PEO)coatings on AZ91 mg alloy has been achieved in the present *** was selected as mg corrosion inhibitor for exchange and intercalation into the nanocontainers,which were subsequently incorporated into the *** was found that the thickness and compactness of the coatings were increased in the presence of LDH *** corrosion protection performance of the blank PEO,LDH containing PEO and inhibitor loaded coatings was evaluated by means of polarization test and electrochemical impedance spectroscopy(EIS).The degradation process and corrosion resistance of PEO coating were found to be greatly affected by the loaded inhibitor and nanocontainers by means of ion-exchange when corrosion occurs,leading to enhanced and stable corrosion resistance of the substrate.

关键词： magnesium Layered double hydroxides Inhibitor Plasma electrolytic oxidation Nanocontainer