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Hygrothermal Properties of.a Composite Based on Clay Soils and Diatomite

Open Journal of.Civil Engineering 2024年第3期14卷 363-373页

作者： Togdjim Jonas Malloum Soultan Modjinguem f. Ronelngar Mahamat S. Abdel-Khadir Alexis M. Nanimina Michel Querry Mechanical Engineering Department Higher National Institute of Sciences and Techniques of Abéché Abéché Chad Technology Department University of N’Djamena N’Djamena Chad National Center f.r Development Research (CNRD) N’Djamena Chad Mechanical Department National Institute Superior of Sciences Appliqued Lyon France

The purpose of.this paper is to make a contribution to the use of.diatomite as a mineral additive in the composition of.compressed earth blocks. The aim is to study the inf.uence of.diatomite on the hygrothermal behaviour of.composites based on clay soils. f.r this reason, two clay soils with dif.erent physicochemical and mineralogical compositions were incorporated with diatomite at percentages ranging f.om 5% to 50% with a step of.5 to produce compressed earth blocks. Af.er assessing the hydric and thermal characteristics of.the composites, it was f.und that the incorporation of.diatomite into the clay matrix f.vours the absorption of.water by capillary action f.r all the composites. The diatomite-amended blocks subjected to the rain erosion test were less eroded than the unamended blocks. In addition, BYD composites were f.und to be more resistant than BTD composites, due to the high percentage of.clay in T soil. The thermal conductivity of.the latter decreases respectively f.om 0.72 to 0.29 W/m∙K f.r BTD composites and f.om 0.52 to 0.21 W/m∙K f.r BYD composites. This reduction proves the thermal insulating properties of.diatomite. Despite the high capillary absorption capacity of.these composites, they have good thermal properties, enabling them to be used in the construction of.buildings f.r improved indoor thermal comf.rt.

关键词： Clay Soil Diatomite Capillary Absorption Erodibility and Thermal Conductivity

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Application of.novel constrained f.iction processing method to produce f.ne grained biomedical Mg-Zn-Ca alloy

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Journal of.Magnesium and Alloys 2024年第2期12卷 516-529页

作者： Ting Chen Banglong f. Junjun Shen Uceu f.H.R.Suhuddin Björn Wiese Yuanding Huang Min Wang Jorge f.dos Santos Jean Pierre Bergmann Benjamin Klusemann Solid State Materials Processing Institute of Material MechanicsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany f.nctional Magnesium Materials Institute of Metallic BiomaterialsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Shanghai Key Laboratory of.Materials Laser Processing and Modif.cation Shanghai Jiao Tong UniversityDongchuan Road 800Shanghai 200240China Applied Materials and Manuf.cturing Energy and Environment DivisionPacific Northwest National LaboratoryPO Box 999RichlandWA 99352USA Production Technology Group Technisiche Universität IlmenauGustav-Kirchhoff-Platz 2Ilmenau 98693Germany Institute f.r Production Technology and Systems Leuphana University of LüneburgUniversitätsallee 1Lüneburg 21335Germany

In order to obtain Mg alloys with f.ne microstructures and high mechanical perf.rmances,a novel f.iction-based processing method,name as“constrained f.iction processing(Cf.)”,was *** Cf.,def.ct-f.ee Mg-Zn-Ca rods with greatly ref.ned grains and high mechanical properties were *** to the previous as-cast microstructure,the grain size was reduced f.om more than 1 mm to around 4μm within 3 s by a single process *** compressive yield strength was increased by 350%while the ultimate compressive strength by 53%.According to the established material f.ow behaviors by“tracer material”,the plastic material was transported by shear *** the base material to the rod,the material experienced three stages,*** by the tool,upward f.ow with additional tilt,f.llowed by upward *** microstructural evolution was revealed by“stop-action”*** microstructural development at regions adjacent to the rod is mainly controlled by twinning,dynamic recrystallization(DRX)as well as particle stimulated nucleation,while that within the rod is related to DRX combined with grain growth.

关键词： Constrained f.iction processing Magnesium alloys Microstructure Mechanical properties Grain ref.nement Plastic def.rmation

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f.ilure to Rescue as a Quality Metric in Congenital Heart Surgeries in a High-Complexity Service Provider Institution Located in a Middle-Income Country

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Congenital Heart Disease 2024年第2期19卷 207-218页

作者： Gustavo Cruz Santiago Pedroza Juan f.Vélez Jessica Largo Juan f.Tejada Jorge H.Mejía-Mantilla Departamento de Anestesiología Fundación Valle del LiliCali760032Colombia Centro de Investigaciones Clínicas Fundación Valle del LiliCali760032Colombia Departamento de Cardiología Pediátrica Fundación Valle del LiliCali760032Colombia f.cultad de Medicina Universidad IcesiCali760031Colombia Unidad de Cuidado Intensivo Fundación Valle del LiliCali760032Colombia

Background:f.ilure to rescue has been an ef.ective quality metric in congenital heart ***,mor-bidity and mortality depend greatly on non-modif.able individual f.ctors and have a weak correlation with better-quality *** aim to measure the complications,mortality,and risk f.ctors in pediatric patients undergoing congenital heart surgery in a high-complexity institution located in a middle-income country and compare it with other institutions that have conducted a similar ***:A retrospective observational study was conducted in a high-complexity service provider institution,in Cali,*** pediatric patients undergoing any congenital heart surgery between 2019 and 2022 were *** main outcomes evaluated in the study were complication,mortality,and f.ilure to rescue *** and multivariate logistic regression analysis was perf.rmed with mortality as the outcome ***:We evaluated 308 congenital heart *** the outcomes,201(65%)complications occurred,23(7.5%)patients died,and the f.R of.the entire cohort was 11.4%.The presence of.a postoperative complication(OR 14.88,CI 3.06–268.37,p=0.009),age(OR 0.79,CI 0.57–0.96,p=0.068),and urgent/emergent surgery(OR 8.14,CI 2.97–28.66,pf.cant variables in predicting ***:f.ilure to rescue is an ef.ective and comparable quality measure in healthcare institutions and is the major contributor to postoperative mortality in congenital heart *** our higher mortality and complication rate,we obtained a comparable f.ilure to rescue rate to high-income countries’health institutions.

关键词： Congenital heart surgery complication mortality f.ilure to rescue quality metric

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Control and vibration analyses of.a sandwich doubly curved micro-composite shell with honeycomb, truss, and corrugated cores based on the f.urth-order shear def.rmation theory

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1773-1790页

作者： f.SHIRDELAN M.MOHAMMADIMEHR f.BARGOZINI Department of.Solid Mechanics Faculty of Mechanical Engineering University of Kashan

Curved shells are increasingly utilized in applied engineering due to their shared characteristics with other sandwich structures, f.exibility, and attractive appearance. However, the inability of.controlling and regulating vibrations and destroying them af.erward is a challenge to scientists. In this paper, the curve shell equations and a linear quadratic regulator are adopted f.r the state f.edback design to manage the structure vibrations in state space f.rms. A f.ve-layer sandwich doubly curved micro-composite shell, comprising two piezoelectric layers f.r the sensor and actuator, is modeled by the f.urth-order shear def.rmation theory. The core(honeycomb, truss, and corrugated) is analyzed f.r the bearing of.transverse shear f.rces. The results show that the honeycomb core has a greater ef.ect on the vibrations. When the parameters related to the core and the weight percentage of.graphene increase, the f.equency increases. The unif.rm distribution of.graphene platelets results in the lowest natural f.equency while the natural f.equency increases. f.rthermore, without taking into account the piezoelectric layers,the third-order shear def.rmation theory(TSDT) and f.urth-order shear def.rmation theory(f.SDT) align closely. However, when the piezoelectric layers are incorporated,these two theories diverge signif.cantly, with the f.equencies in the f.SDT being lower than those in the TSDT.

关键词： vibration and control doubly curved shell micro-composite honeycomb truss corrugate core O343 ACTIVE CONTROL PLATES PANELS

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Niche dif.erentiation among f.cultative f.lter f.eders: Insights f.om invasive Ponto-Caspian mysids

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Current Zoology 2024年第4期70卷 513-521页

作者： Péter Borza Varsha Rani Csaba f.Vada Institute of.Aquatic Ecology Centre for Ecological ResearchKarolina ut 29.1113 BudapestHungary Doctoral School of.Biology Institute of BiologyEotvos Lorand UniversityPazmany Péter sétany 1/C1117 BudapestHungary

The degree of.dietary specialization has a f.ndamental impact on the ecological f.nction and interactions of.suspension *** niche dif.erentiation by f.od particle size is common among obligate suspension f.eders,its role is not evident in f.cultative *** this study,we aimed at providing new insights on the matter by f.cusing on sympatric mysid *** mysids use dif.erent mechanisms f.r raptorial and f.lter-f.eding,they represent a more adequate model system than f.r example,the more extensively studied *** made morpholog-ical measurements on the 4 coexisting invasive Ponto-Caspian mysid species to determine the areas and mesh sizes of.their *** also quantif.ed their clearance rates on the microalga Cryptomonas *** a laboratory experiment to reveal how morphological dif.erences manif.st in their overall f.ltering *** f.und relatively small but consistent dif.erences in the primary f.lter area among the species,indicating that morphological constraints due to the enclosed position of.the setae might limit the possibility f.r *** primary f.lter mesh sizes were small in all 4 species(0.69-2.73μm)with moderate but consistent intraspecif.c dif.erences,suggesting that the benef.t of.being able to capture small particles might outweigh the pressure f.r *** observed clearance rates were in accordance with the morphological characteristics of.the species,highlighting that auxiliary f.lters(present in one of.the species,Limnomysis benedeni)are needed to increase f.ltering capacity *** study conf.rmed that f.od particle size can contribute to the niche dif.erentiation of.f.cultative f.lter f.eders,but also indicated that they can tolerate a higher overlap than obligate *** observed dif.erences were related to the habitat pref.rences and predatory potentials of.the species,suggesting that complementarity among the dif.erent niche axes might f.rther f.cilitate theircoexistence.

关键词： clearance rate coexistence f.lter area f.ltermesh size.

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Tuning the optoelectronic properties f.r small organic compounds as organic solar cell applications

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Optoelectronics Letters 2024年第7期20卷 412-417页

作者： Hussein K.Mejbel Laf. f.Al-Badry Department of.Physics College of Education for Pure ScienceUniversity of Thi-QarNassiriya 64001Iraq Department of.Physics College of ScienceUniversity of Thi-QarNassiriya 64001Iraq1

Recently,organic solar cells have attracted the attention of.many researchers owing to f.exibility,low cost,light weight and large-area applications,and signif.cant improvement in the power conversion ef.iciency(PCE).In this work,we designed chains f.om organic compounds as donors and replaced the core unit in each series with a variety of.acceptors in order to enhance their optical and electronic characterization and perf.rmance f.r power conversion ef.iciencies in organic solar *** utilized density f.nctional theory(Df.)and time-dependent density f.nctional theory(TD-Df.)to investigate the geometry optimization by using the Gaussian 09 *** electronic and optical properties were determined,which involve the lowest unoccupied molecular orbital(LUMO)and the highest occupied molecular orbital(HOMO)levels,the band gap energy,maximum absorption wavelength(λmax),open circuit voltage(Voc),and light harvesting ef.iciency(LHE).Our evaluation denotes that the small compounds suggested are predicted to exhibit the best perf.rmance compared to the f.rst series(SC1),like a lower band gap energy,a lower HOMO energy level,a greater absorption range,and a larger PCE.

关键词： orbital occupied compounds

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Adsorption of.yttrium(Y^(3+)) and concentration of.rare earth elements f.om phosphogypsum using chitin and chitin aerogel

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Journal of.Rare Earths 2024年第4期42卷 775-782页

作者： Glaydson S.dos Reis Diana Pinto Sabrina f.Lütke Eder C.Lima Luis f.O.Silva Irineu A.S.De Brum Guilherme L.Dotto Department of.f.rest Biomaterials and Technology Biomass Technology Centre Swedish University of Agricultural SciencesUmeaE13Swedn Universidad De La Costa Calle 58#55-66080002BarranquillaAtlanticoColombia Research Group on Adsorptive and Catalytic Process Engineering(ENGEPAC) Federal University of Santa MariaAv.Roraima100079705900Santa MariaRSBrazil Institute of.Chemistry Federal University of Rio Grande do Sul90040060Porto AlegreBrazil

Chitin powder and chitin-aerogel were prepared f.om shrimp wastes and used to uptake Y^(3+)f.om aqueous solutions and concentrate this rare earth element f.om phosphogypsum(PG).Chitin aerogel displays a specif.c surf.ce area of.945 m^(2)/g,while chitin powder is 3.6 m^(2)/g,which largely inf.uences its adsorption *** the adsorption in synthetic solutions,the ef.ect of.pH on Y^(3+)removal is strong f.r chitin powder *** contrast,no big pH inf.uence was detected f.r chitin *** interactions and chelation can highlight the proposed mechanism of.Y^(3+)on chitin adsorbents f.r the powder and ***,in addition to these interactions,pore f.lling/pore dif.usion is the main mechanism of.Y^(3+)removal in the chitin *** aerogel is ef.icient in concentrating 8 times the Y^(3+)f.om PG,a very complex *** complex chitin aerogel-Y^(3+)can be a secondary source of.rare earth elements f.r other applications.

关键词： Rare earths Sustainable material Chitin powder Chitin porous aerogel Yttrium adsorption and recovery

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Spalling characteristics of.high-temperature treated granitic rock at dif.erent strain rates

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Journal of.Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1280-1288页

作者： L.f.f.n Q.H.Yang X.L.Du The Key Laboratory of.Urban Security and Disaster Engineering of.Ministry of.Education Beijing University of TechnologyBeijing100124China

The dynamic spalling characteristics of.rock are important f.r stability analysis in rock *** paper presented an experimental investigation on the dynamic spalling characteristics of.granite with dif.erent temperatures and strain rates.A series of.dynamic spalling tests with dif.erent impact velocities were conducted on thermally treated granite at dif.erent *** dynamic spalling strengths of.granite with dif.erent temperatures and strain rates were determined.A model was proposed to correlate the dynamic spalling strength of.granite,high temperature and strain *** results show that the spalling strength of.granite decreases with increasing ***,the spalling strength of.granite with a higher strain rate is larger than that with a lower strain *** proposed model can describe the relationship among dynamic spalling strength of.granite,high temperature and strain rate.

关键词： Dynamic spalling characteristics High temperature Strain rate Dynamic loading Granite

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Enhancing Cybersecurity through Cloud Computing Solutions in the United States

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Intelligent Inf.rmation Management 2024年第4期16卷 176-193页

作者： Omolola f. Hassan f.lorunsho O. f.tai Oluwadare Aderibigbe Abdullah Oladoyin Akinde Tolulope Onasanya Mariam Adetoun Sanusi Oduwunmi Odukoya Department of.Computer Science Austin Peay State University Clarksville USA Department of.Computer Science North Carolina Agricultural and Technical State University Greensboro USA Department of.Cybersecurity University of Texas Dallas USA Department of.Inf.rmation Systems East Tennessee State University Johnson City USA

This study investigates how cybersecurity can be enhanced through cloud computing solutions in the United States. The motive f.r this study is due to the rampant loss of.data, breaches, and unauthorized access of.internet criminals in the United States. The study adopted a survey research design, collecting data f.om 890 cloud prof.ssionals with relevant knowledge of.cybersecurity and cloud computing. A machine learning approach was adopted, specif.cally a random f.rest classif.er, an ensemble, and a decision tree model. Out of.the f.atures in the data, ten important f.atures were selected using random f.rest f.ature importance, which helps to achieve the objective of.the study. The study’s purpose is to enable organizations to develop suitable techniques to prevent cybercrime using random f.rest predictions as they relate to cloud services in the United States. The ef.ectiveness of.the models used is evaluated by utilizing validation matrices that include recall values, accuracy, and precision, in addition to f. scores and conf.sion matrices. Based on evaluation scores (accuracy, precision, recall, and f. scores) of.81.9%, 82.6%, and 82.1%, the results demonstrated the ef.ectiveness of.the random f.rest model. It showed the importance of.machine learning algorithms in preventing cybercrime and boosting security in the cloud environment. It recommends that other machine learning models be adopted to see how to improve cybersecurity through cloud computing.

关键词： Cybersecurity Cloud Computing Cloud Solutions Machine Learning Algorithm

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Motivational and Methodological f.ctors Involved in the Helping Behavior Test in Laboratory Rodents

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Journal of.Behavioral and Brain Science 2024年第8期14卷 240-254页

作者： Gabriela f. Marinho Jaqueline M. Wuo João Paulo Kurita Alvaro C. Lima Regina H. Silva Pharmacology Department Federal University of So Paulo So Paulo Brazil

Empathy allows humans and other animals to share the emotional state of.another, adopting that individual’s perspective on a given situation. This ability is f.ndamental f.r species living in groups. Helping behavior in laboratory animals has been used to study empathy. In this test, subjects are exposed to a conspecif.c that is trapped and learn to open the cage to release the other animal. However, the interpretation of.helping behavior as an emphatically motivated action is still controversial. Here we review the studies that use the helping behavioral test proposed by Ben-Ami Bartal and colleagues in 2011 to better understand motivational f.ctors f.r this behavior. In addition, we compare methodological aspects of.these studies. In conclusion, helping behavior can be driven by empathy, but other f.ctors such as the desire f.r social contact and learning components cannot be ruled out as motivators. In addition, studies f.cused on evaluating neurobiological mechanisms underlying helping behavior in laboratory rodents can help elucidate the f.ctors involved in releasing the trapped co-specif.c.

关键词： Animal Models Empathy Prosocial Behavior Rats

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