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Local Mfs Matrix Decomposition Algorithms for Elliptic BVPs in Annuli

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Numerical Mathematics(Theory,Methods and Applications) 2024年第1期17卷 93-120页

作者： c.s.chen Andreas Karageorghis Min Lei school of Mathematics and Natural sciences University of Southern MississippiHattiesburgMS 39406USA Department of Mathematics and statistics University of CyprusP.O.Box 20537Nicosia 1678Cyprus college of Mathematics Taiyuan University of TechnologyTaiyuan 030024P.R.China

We apply the local method of fundamental solutions(LMfs)to boundary value problems(BVPs)for the Laplace and homogeneous biharmonic equations in *** appropriately choosing the collocation points,the LMfs discretization yields sparse block circulant system *** a result,matrix decomposition algorithms(MDAs)and fast fourier transforms(ffTs)can be used for the solution of the systems resulting in considerable savings in both computational time and storage *** accuracy of the method and its ability to solve large scale problems are demonstrated by applying it to several numerical experiments.

关键词： Local method of fundamental solutions Poisson equation biharmonic equation matrix decomposition algorithms fast fourier transforms

Inflow and outflow permeability tests in a very soft clay under low stresses

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3270-3283页

作者： J.W.s.Vargas f.A.B.Danziger f.R.Lopes T.Lunne federal University of Rio de Janeiro Rio de JaneiroBrazil Norwegian Geotechnical Institute OsloNorway

In situ inflow and outflow permeability tests with the BAT probe at sarapuíII soft clay test site are presented.A description of the BAT permeability test is provided,discussing its advantages and shortcomings,especially in the case of very soft clays under low *** pressures were monitored during probe installation and were found to be slightly lower than piezocone u2 pore pressures,consistent with the position of the *** role of filter tip saturation was investigated after the usual saturation procedure provided an unsatisfactory pore pressure response during probe *** show that the vacuum saturation procedure provides adequate response during installation and increases the reliability of the coefficient of permeability determination in early *** inflow and outflow tests yielded similar results,indicating that careful execution of the test can lead to good test repeatability regardless of the loading *** sequences of alternated inflow and outflow tests have yielded similar results,indicating that soil reconsolidation and filter clogging were negligible in the tests *** are presented concerning the relationship between index parameters and the in situ coefficient of permeability for sarapuíII clay,which plot outside the range of existing databases.

关键词： Permeability test soft clay BAT probe Inflow and outflow tests

Growth Performance of crocodile fed with chicken Intestine and Trash fish at smallholder farm in siem Reap Province,cambodia

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Journal of Environmental science and Engineering(B) 2024年第2期13卷 86-91页

作者： sourloing Hor Kanan Dim sungchang Kang Kroesna Kang Kouch Theng Manay ith faculty of Veterinary Medicine Royal University of AgriculturePhnom Penh 12400Cambodia National Institute of Education Phnom Penh 120204Cambodia Graduate school Royal University of AgriculturePhnom Penh 12400Cambodia

The experiment was conducted at the smallholder crocodile farm at Pouk district,siem reap province,and lasted 12 months,commenced from January 1st to December 31st,*** cRBD(completely Randomized Block Design),was used in 3 treatments,such as T1(fed chicken intestine only),T2(fed chicken intestine+trash fish)and T3(fed trash fish only),with 4 replications in each *** block was set by gender of crocodile,male and *** 36 of local breed crocodiles 4 months old were allocated into each replication *** result found that the length of crocodile gradually increased in the first semester,then it greatly increased from or for second semester for all *** addition,the final body length of crocodile was significant different among treatments(pf T2(fed chicken intestine+trash fish)had the longest *** length was also affected by gender,and male crocodile had longer body length(psignificant differences for the interaction between types of feed with gender(p>0.05)(Table 1).The body weight of crocodile had gradually increased in the first semester,then it greatly increased from or for second semester for all treatments,while the final body weight of crocodile was also significant different among treatments(pf crocodile(ps significant different among treatments(pf T2(fed chicken intestine+trash fish)had highest ADG,11.05 g,followed by T3(fed trash fish only),while the T1 had the lowest *** gender of crocodile affected the ADG of crocodile,and male crocodile had higher ADG than female crocodile(psignificant differences for the interaction between type of feed with gender(p>0.05).feed intake was calculated based on amount of feed offer and measured in fresh *** amount of intake feed in all treatments was the ***(feed conversion Ratio)was significant different a

关键词： Local breed body length body weight ADG fcR

Growth Efficiency of Local chickens Using sweet Potato Vine with concentration feed as a Basal Diet

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Journal of Environmental science and Engineering(B) 2024年第3期13卷 108-113页

作者： Hieak Hun suheang sorn chan Bun Manay ith Ty chhay Kouch Theng chetra sar faculty of Animal sciences Royal University of AgriculturePhnom Penh 12400Cambodia General Directorate of Animal Health and Production Phnom Penh 120603Cambodia faculty of Veterinary Medicine Royal University of AgriculturePhnom Penh 12400Cambodia Ministry of Environment Sangkat Tonle BasakKhan Chamkar MonPhnom Penh 120101Cambodia Ministry of Agriculture Forestry and FisheriesSangkat Tonle BasakKhan Chamkar MonPhnom Penh 120101Cambodia Graduate school Royal University of AgriculturePhnom Penh 12400Cambodia

The experiment was conducted at the animal experimental station of the faculty of Animal sciences,Royal University of Agriculture,commenced from 10 January to 14 March,*** cRD(completely Randomized Design)was used with 5 treatments and 4 *** 500 chicks at one-day-old,local bread,were purchased from farmers who run their small scale hatchery *** chicks were kept together till 21 days old,and then were allocated randomly into in five diets(treatments),25 chicks per *** feed formulas for this study were designed and calculated to maintain a protein content of approximately 17%,dividing into 5 feed formulas(Treatments),such as concentrated feed only(control treatment:T0),plus 10%of fresh sweet potato vine(T1),plus 20%of fresh sweet potato vine(T2),plus 30%of fresh sweet potato vine(T3)and plus 20%of sweet potato vine meal(T4).The results showed that the treatment T1,had a similar final weight with the treatment T4,but was slightly lower than the treatment T0 which used concentrated feed *** intake and fcR(feed conversion Ratio)were not significantly different among those *** conclusion,the average daily weight gain of chickens seemed to decrease with increasing the level of fresh sweet potato ***,the optimum level of fresh sweet potato vine was 10%,which may have little effect on the growth performance of local *** addition,it was not far different from the positive control treatment and the treatment using sweet potato vine ***,the producers can increase the amount of sweet potato vine in feed formula by processing it into meal and mixing with concentrated feed or using as feed ingredients.

关键词： Local breed final weight feed intake fcR

Adaptive optimisation of explosive reactive armour for protection against kinetic energy and shaped charge threats

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Defence Technology（防务技术） 2024年第10期40卷 1-12页

作者： Philipp Moldtmann Julian Berk shannon Ryan Andreas Klavzar Jerome Limido christopher Lange santu Rana svetha Venkatesh University of the federal Armed forces Hamburg Holstenhofweg 85Hamburg 22043Germany Applied Artificial Intelligence Institute(A2I2) Deakin University75 Pigdons RdWaurn PondsVIC 3216Australia french-German Research Institute of saint-Louis(IsL) 5 Rue de General CassagnouSaint-Louis 68300France ABsTRAO 16 Rue de Isaac NewtonPlaisance-du-Touch 31830France

We evaluate an adaptive optimisation methodology,Bayesian optimisation(BO),for designing a minimum weight explosive reactive armour(ERA)for protection against a surrogate medium calibre kinetic energy(KE)long rod projectile and surrogate shaped charge(sc)*** perform the optimisation using a conventional BO methodology and compare it with a conventional trial-and-error approach from a human expert.A third approach,utilising a novel human-machine teaming framework for BO is also *** for the optimisation is generated using numerical simulations that are demonstrated to provide reasonable qualitative agreement with reference *** human-machine teaming methodology is shown to identify the optimum ERA design in the fewest number of evaluations,outperforming both the stand-alone human and stand-alone BO *** a design space of almost 1800 configurations the human-machine teaming approach identifies the minimum weight ERA design in 10 samples.

关键词： Terminal ballistics Armour Explosive reactive armour Optimisation Bayesian optimisation

Effects of dust controls on respirable coal mine dust composition and particle sizes:case studies on auxiliary scrubbers and canopy air curtain

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International Journal of coal science & Technology 2024年第3期11卷 86-101页

作者： f.Animah c.Keles W.R.Reed E.sarver Department of Mining and Minerals Engineering Virginia Polytechnic Institute&State UniversityBlacksburgVAUSA National Institute of Occupational safety and Health(NIOsH) PittsburghPAUSA

control of dust in underground coal mines is critical for mitigating both safety and health *** decades,the National Institute of Occupational safety and Health(NIOsH)has led research to evaluate the effectiveness of various dust control technologies in coal *** studies have included the evaluation of auxiliary scrubbers to reduce respirable dust downstream of active mining and the use of canopy air curtains(cAcs)to reduce respirable dust in key operator *** detailed dust characterization was not a focus of such studies,this is a growing area of *** preserved filter samples from three previous NIOsH studies,the current work aims to explore the effect of two different scrubbers(one wet and one dry)and a roof bolter cAc on respirable dust composition and particle size *** this,the preserved filter samples were analyzed by thermogravimetric analysis and/or scanning electron microscopy with energy dispersive *** indicate that dust composition was not appreciably affected by either scrubber or the ***,the wet scrubber and cAc appeared to decrease the overall particle size *** an effect of the dry scrubber was not consistently observed,but this is probably related to the particular sampling location downstream of the scrubber which allowed for significant mixing of the scrubber exhaust and other return *** from the insights gained with respect to the three specific dust control case studies revisited here,this work demonstrates the value of preserved dust samples for follow-up investigation more broadly.

关键词： Respirable dust Dust control sEM–EDX scrubber canopy air curtain silica

A 3D In-vitro model of the human dentine interface shows long-range osteoinduction from the dentine surface

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International Journal of Oral science 2024年第2期16卷 225-237页

作者： William Macalester Asme Boussahel Rafael O.Moreno-Tortolero Mark R.shannon Nicola West Darryl Hill Adam Perriman school of cellular and Molecular Medicine Biomedical Sciences BuildingUniversity of BristolUniversity WalkBristolUnited Kingdom Bristol centre for functional Nanomaterials HH Wills Physics LaboratoryUniversity of BristolTyndall AvenueBristolUnited Kingdom centre for Protolife Research School of ChemistryUniversity of BristolCantocks CloseBristolUnited Kingdom Max Planck-Bristol centre for Minimal Biology School of ChemistryUniversity of BristolBristolUnited Kingdom Periodontology Bristol Dental SchoolUniversity of BristolLower Maudlin StreetBristolUnited Kingdom

Emerging regenerative cell therapies for alveolar bone loss have begun to explore the use of cell laden hydrogels for minimally invasive surgery to treat small and spatially complex maxilla-oral ***,the oral cavity presents a unique and challenging environment for in vivo bone tissue engineering,exhibiting both hard and soft periodontal tissue as well as acting as key biocenosis for many distinct microbial communities that interact with both the external environment and internal body systems,which will impact on cell fate and subsequent treatment ***,we design and bioprint a facile 3D in vitro model of a human dentine interface to probe the effect of the dentine surface on human mesenchymal stem cells(hMscs)encapsulated in a microporous hydrogel *** demonstrate that the dentine substrate induces osteogenic differentiation of encapsulated hMscs,and that both dentine andβ-tricalcium phosphate substrates stimulate extracellular matrix production and maturation at the gel-media interface,which is distal to the gel-substrate *** findings demonstrate the potential for long-range effects on stem cells by mineralized surfaces during bone tissue engineering and provide a framework for the rapid development of 3D dentine-bone interface models.

关键词： interface den surface

synthesis of coral-like structures of Pr-Yb co-doped YIG: structural,optical, magnetic and antimicrobial properties

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Journal of Rare Earths 2024年第3期42卷 543-554,I0004页

作者： A.fernandez francisca P.Araujo Y.Guerra s.castro-Lopes J.Matilla-Arias Idglan s.de Lima Edson c.silva-filho Josy A.Osajima f.Guerrero R.Pena-Garcia federal University of Piau Graduate Program in Materials Science and EngineeringTeresinaPIBrazil federal Rural University of Pernambuco Academic Unit of Cabo de Santo AgostinhoCabo de Santo AgostinhoPEBrazil federal University of Piaui Department of PhysicTeresinaPBrazil federal University of Pernambuco Graduate Program in Materials ScienceRecifePEBrazil University of Granma Departmentof Basic Sciences and Applied InformaticsFaculty of Technical SciencesBayamoCuba federal University of Amazonas Department of PhysicManausAMBrazil federal University of Pernambuco Department of PhysicRecifePEBrazil

coral-like structures of the Y_(3-x)Pr_(x)fe_(5-y)Yb_(y)O_(12),(0.00 ≤ x ≤ 0.04, 0.00 ≤ y ≤ 0.02) compound were synthesized using the sol-gel method. structural investigation certified the YIG cubic crystal structure formation, without any secondary phase. It is shown that, the relatively large ionic radius of the dopant cations results in an expansion of the lattice parameter, variations in the Iona-O-Iondangle, Iona-O,Iond-O and Ionc-O bond distances and decrease in the average crystallite size. fourier transform infrared(fTIR) and Raman measurements are essential to testify the single-phase formation of YIG crystal structure and are observed changes in the stretching and vibrational modes, respectively. The morphological study, energy dispersive spectroscopy(EDs) spectra and textural properties show corallike structures, peaks associated with Pr^(3+) and Yb^(3+) atoms and the effect of dopants on surface area,diameter, and pore volume, respectively. The optical analysis from diffuse reflectance spectra witnessed an increase in the optical gap band, a decrease in Urbach energy and blue shift in the charge transfer,correlated with the expansion of the unit cell due to the dopant's insertion in the YIG structure. A typical ferrimagnetic behavior is exhibited by the Y_(3-x)Pr_(x)fe_(5-y)Yb_(y)O_(12)compound. The saturation magnetization(M_(s)), cubic anisotropy constant(K_(1)) and coercive field(H_(c)) increase with the Pr^(3+)cations content, as consequence of their magnetic nature and distribution around of fe^(3+)ions due to the coexistence with the Yb^(3+). finally, for the first time, antibacterial tests by mean of the direct contact method were performed for YIG co-doped with Pr^(3+)and Yb^(3+)and it is shown that, relatively high dosages of Pr^(3+) cations favored the activity against s. aureus, therefore, a new biological property for YIG doped with rare earths is presented.

关键词： Yttrium iron garnet(YIG) coral-like structures Rare earths Band gap energy Magnetic properties Antimicrobial properties

A global analysis of the introduction pathways and characteristics associated with non-native fish species introduction, establishment, and impacts

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Ecological Processes 2024年第2期13卷 16-31页

作者： camille Bernery céline Bellard franck courchamp sébastien Brosse Boris Leroy cNRs Agro Paris Tech Ecologie Systématique Evolution Université Paris-Saclay Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA UMR 8067) Muséum National d’Histoire Naturelle Sorbonne Universités Université de Caen Normandie Université des Antilles CNRS IRD Laboratoire évolution & Diversité Biologique (EDB UMR5174) Université Paul Sabatier-Toulouse 3 CNRS IRD UPS

Background The invasion success of introduced freshwater fishes is influenced by many factors, including ecological, species, and socioeconomic characteristics. Most studies that document the importance of these characteristics are conducted at local scales and/or focus on a single step of the invasion process. In this study, we aim to determine the species characteristics, ecological characteristics, and socioeconomic characteristics of non-native freshwater fish invasions. Our assessment was done at the global scale and considers all three steps of the invasion(i.e., introduction, establishment, and impact). for this purpose, we applied generalized linear models to 20 variables collected for 307 non-native species and modeled them as a function of ecological characteristics(i.e., environmental features), species traits(i.e., functional and morphological), and socioeconomic characteristics(i.e., human use and introduction pathways). We considered the number of countries in which each species was introduced, established, or had ecological impacts as a proxy of invasion step success. We also explored the specifics of species introduced through the aquaculture and the ornamental fish trade *** We found that non-native freshwater fishes with broad diets, high parental care, and multiple introduction pathways are the most widely introduced and established worldwide. The number of countries with impacts reported was best explained by the type of introduction pathway(i.e., aquaculture or fisheries). Moreover, among non-native species introduced through aquaculture, those belonging to cypriniformes and having broad diets were the most widely introduced and established species. In contrast, the species introduced through the ornamental fish trade pathway belonged to various taxonomic orders but were mainly native to tropical *** considering several types of factors is important when analyzing the invasion success of freshwater fish and disentang

关键词： Aquaculture Ecology Exotic freshwater fish Introduction pathway Invasion step Morphology Ornamental fish trade socioeconomic Trait