检索结果-南通市图书馆

two-Stream Approximation to the Radiative transf.r Equation:A New Improvement and Comparative Accuracy with Existing Methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第2期41卷 278-292页

作者： f.Momo tEMGOUA L.Akana NGUIMDO DNJOMO Environmental Energy technologies Laboratory(EEtL) Faculty of SciencesUniversity of YaoundéPO Box 812 YaoundéCameroon Department of.Electrical and Electronic Engineering Faculty of Engineering and TechnologyUniversity of BueaPO Box 63 BueaCameroon

Mathematical modeling of.the interaction between solar radiation and the Earth's atmosphere is f.rmalized by the radiative transf.r equation(RtE), whose resolution calls f.r two-stream approximations among other methods. this paper proposes a new two-stream approximation of.the RtE with the development of.the phase f.nction and the intensity into a third-order series of.Legendre polynomials. this new approach, which adds one more term in the expression of.the intensity and the phase f.nction, allows in the conditions of.a plane parallel atmosphere a new mathematical f.rmulation of.γparameters. It is then compared to the Eddington, Hemispheric Constant, Quadrature, Combined Delta f.nction and Modif.ed Eddington, and second-order approximation methods with ref.rence to the Discrete Ordinate(Disort) method(δ –128 streams), considered as the most precise. this work also determines the conversion f.nction of.the proposed New Method using the f.ndamental def.nition of.two-stream approximation(f.tSA) developed in a previous work. Notably,New Method has generally better precision compared to the second-order approximation and Hemispheric Constant methods. Compared to the Quadrature and Eddington methods, New Method shows very good precision f.r wide domains of.the zenith angle μ 0, but tends to deviate f.om the Disort method with the zenith angle, especially f.r high values of.optical thickness. In spite of.this divergence in ref.ectance f.r high values of.optical thickness, very strong correlation with the Disort method(R ≈ 1) was obtained f.r most cases of.optical thickness in this study. An analysis of.the Legendre polynomial series f.r simple f.nctions shows that the high precision is due to the f.ct that the approximated f.nctions ameliorate the accuracy when the order of.approximation increases, although it has been proven that there is a limit order depending on the f.nction f.om which the precision is lost. this observation indicates that increasing the order of.app

关键词： Radiative transf.r Equation two-stream method Legendre polynomial optical thickness moments of.specif.c intensity conversion f.nction transmittance ref.ectance

thermoluminescence characterization of.natural and synthetic irradiated Ce-monazites

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of.Rare Earths 2024年第4期42卷 643-650页

作者： V.Correcher C.Boronat J.Garcia-Guinea J.f.Benavente t.Rivera-Montalvo CIEMAt Av.Complutense 4028040MadridSpain MNCN-CSIC J.Gutierrez Abascal 228006MadridSpain Instituto Politécnico Nacional CICATA-IPNAv.Legaria 694Mexico City11500Mexico

the thermoluminescence(tL)emission of.synthetic and natural Ce-monazites was characterized here to determine the potential application in the identif.cation of.microscopic def.cts f.om a qualitative point of.view trying to link each tL peak to a chemical-physical *** kinetic parameters that lead the luminescence processes were calculated by means of.variable heating rate and computing glow curve deconvolution methods and allow identif.ing three groups of.components at~90,130 and 290℃(f.r the mineral sample)and~90,170,220,270 and 320℃(f.r the synthetic CePO_(4):Nd_(0.20),La_(0.25)).the main dif.erences appreciated in these complex tL curves are mainly due to(i)the content of.impurities(natural sample contains lanthanides as well as U 0.60%and th 5.22%)and(ii)the degree of.crystallinity of.the samples which is directly related to the type of.impurities(synthetic monazite relies only on Nd and La).the behavior of.the dose response in the range of.1-8 Gy is similar f.r both samples;the tL intensity increases linearly as the dose increases without changes in the position of.the maxima,denoting f.rst-order kinetic luminescence *** peak could be mostly associated with structural def.cts(i.e.,phase transitions),chemical reactions(i.e.,Ce3+?Ce4+redox reaction,dehydration or dehydroxylation processes)or intrinsic def.cts(i.e.,f.enkel def.cts,ODCs or NBOHCs).

关键词： thermoluminescence Kineticparameters Phosphate Ce-monazite Def.cts Rare earths

MicroRNAs in hepatocellular carcinoma treatment:Charting the path f.rward

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of.Gastroenterology 2024年第11期30卷 1470-1474页

作者： Hong t Lin Antonio f.Alvarez Castaneda Somashekar G Krishna Khalid Mumtaz Division of.Gastroenterology Hepatology and NutritionDepartment of MedicineThe Ohio State University Wexner Medical CenterColumbusOH 43210United States

MicroRNAs(miRNAs)are recognized f.r their involvement in the regulation of.gene expression and exhibit signif.cant potential in both the prognostic assessment and treatment of.hepatocellular carcinoma(HCC).HCC,like other tumors,seldom occurs in isolation;instead,it evolves within a microenvironment f.aturing oncogenic and tumor-suppressive *** combined with suitable delivery vehicles,miRNA technology provides the capability to directly engage with these elements,thereby hindering tumor f.rmation and *** research in this domain holds the promise of.enabling a more ef.icacious and multi-modal treatment approach f.r HCC in the near f.ture.

关键词： Hepatocellular carcinoma tumor microenvironment MicroRNA Mesenchymal stem cell Exosome

the Importance of.Posterior tibial Slope in tKR: Pre and Post-Operative Measurements in United States Osteoarthritic Patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of.Orthopedics 2024年第8期14卷 374-379页

作者： f.ederick f. Buechel Sr f.ederick f. Buechel Jr Rutgers New Jersey Medical School Department of Orthopaedic Surgery Newark USA Lenox Hill Hospital Department of Orthopaedic Surgery New York USA

Background: Sagittal plane placement of.the tibial component in total knee replacement (tKR) has important implications f.r maximizing the range of.f.exion motion, allowing collateral ligaments to f.nction more normally, as well as providing ideal compressive loading on the tibial bone-prosthesis interf.ce. this study attempts to quantif. the normal posterior tibial slope (PtS) angle pre-operatively and post-operatively in osteoarthritic patients af.er using a conventional extramedullary tibial resection guide to assess its ef.ectiveness. Methods: f.rty-nine primary cementless total knee replacements in 34 osteoarthritic patients were measured radiographically pre-operatively and one year post-operatively to determine the PtS and its ef.ect on range of.motion. Lateral X-rays, using the anterior cortical line of.the tibia, were employed f.r all measurements. Results: Pre-operative PtS measured 11.83˚ (range 5˚ - 18˚), while post-operative PtS of.implanted tibial components measured 11.30o (range 4˚ - 18˚). the pre-operative range of.motion of.112˚ (range 30˚ to 135˚) was improved to 119˚ (range 90˚ to 135˚) post-operatively af.er 1 year. Conclusions: Anterior tibial shaf. ref.rencing using a conventional extramedullary tibial resection guide provides an easy and convenient method f.r reproducing the anatomical PtS during tKR. this methodology provided improvement in average range of.motion f.om 112˚ pre-operatively to 119˚ post-operatively at one year.

关键词： Posterior tibial Slope Posterior tibial Inclination Extramedullary tibial Resection Guide total Knee Alignment

In-situ construction of.grass-like hybrid architecture responsible f.r extraordinary corrosion perf.rmance: Experimental and theoretical approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Materials Science 2024年第1期6卷 44-59页

作者： t.Suhartono f.Hazmatulhaq Y.Sheng A.Chaouiki M.P.Kamil Y.G.Ko Materials Electrochemistry Group School of Materials Science and EngineeringYeungnam UniversityGyeongsan38541Republic of Korea Research Center f.r Advanced Materials National Research and Innovation Agency(BRIN)South TangerangBanten15314Indonesia

Despite the engineering potential by the co-existence of.inorganic and organic substances to protect vulnerable metallic materials f.om corrosive environments,both their interaction and in-situ f.rmation mechanism to induce the nature-inspired composite remained less *** present work used three distinctive mercaptobenzazole(MB)compounds working as corrosion inhibitors,such as 2-mercaptobenzoxazole(MBO),2-mercaptobenzothiazole(MBt),and 2-mercaptobenzimidazole(MBI)in a bid to understand how the geometrical structure arising f.om O,S,and N atoms af.ected the interaction toward inorganic *** compounds that were used here to control the corrosion kinetics would be interacted readily with the pre-existing MgO layer f.bricated by plasma *** phenomenon triggered the nucleation of.the root network since MB compounds were seen to be adsorbed actively on the def.ctive surf.ce through the active sites in MB ***,the molecule with twin donor atoms adjacent to the mercapto-sites af.ected the f.cile growth of.the grass-like structures with‘unif.rm’distribution via molecular self.assembly,which showed better corrosion perf.rmance than those with having dissimilar donor atoms with the inhibition ef.iciency(η)of.97%*** f.rmation mechanism underlying nucleation and growth behavior of.MB molecule was discussed concerning the theoretical calculation of.density f.nctional theory.

关键词： Nature-inspired composite Organic-inorganic interaction Corrosion inhibitor Density f.nctional theory Electrochemistry

Macroscopic traversable Wormholes: Minimum Requirements

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of.Astronomy and Astrophysics 2024年第3期14卷 230-243页

作者： Peter K. f. Kuhf.ttig Department of.Mathematics Milwaukee School of Engineering Milwaukee USA

While wormholes are just as good a prediction of.Einstein’s theory as black holes, they are subject to severe restrictions f.om quantum f.eld theory. to allow f.r the possibility of.interstellar travel, a macroscopic wormhole would need to maintain suf.iciently low radial tidal f.rces. It is proposed in this paper that the assumption of.zero tidal f.rces, i.e., the limiting case, is suf.icient f.r overcoming the restrictions f.om quantum f.eld theory. the f.asibility of.this approach is subsequently discussed by 1) introducing the additional conditions needed to ensure that the radial tidal f.rces can indeed be suf.iciently low and 2) by viewing traversable wormholes as emergent phenomena, thereby increasing the likelihood of.their existence.

关键词： Morris-thorne Wormholes traversability Minimum Requirements Stability Compatibility with Quantum f.eld theory

On an Invariant of.tournament Digraphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of.Applied Mathematics and Physics 2024年第7期12卷 2711-2722页

作者： Boris f. Melnikov Bowen Liu f.culty of.Computational Mathematics and Cybernetics Shenzhen MSU-BIT University Shenzhen China

to date, it is unknown whether it is possible to construct a complete graph invariant in polynomial time, so f.st algorithms f.r checking non-isomorphism are important, including heuristic algorithms, and f.r successf.l implementations of.such heuristics, both the tasks of.some modif.cation of.previously described graph invariants and the description of.new invariants remain relevant. Many of.the described invariants make it possible to distinguish a larger number of.graphs in the real time of.a computer program. In this paper, we propose an invariant f.r a special kind of.directed graphs, namely, f.r tournaments. the last ones, f.om our point of.view, are interesting because when f.xing the order of.vertices, the number of.dif.erent tournaments is exactly equal to the number of.undirected graphs, also with f.xing the order of.vertices. In the invariant we are considering, all possible tournaments consisting of.a subset of.vertices of.a given digraph with the same set of.arcs are iterated over. f.r such subset tournaments, the places are calculated in the usual way, which are summed up to obtain the f.nal values of.the points of.the vertices;these points f.rm the proposed invariant. As we expected, calculations of.the new invariant showed that it does not coincide with the most natural invariant f.r tournaments, in which the number of.points is calculated f.r each participant. So f.r, we have conducted a small number of.computational experiments, and the minimum value of.the pair correlation between the sequences representing these two invariants that we f.und is f.r dimension 15.

关键词： Graph Directed Graph tournament ?nvariant

Impaired Cognition and Stroke Rehabilitation Outcomes: Are they Related?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of.therapy and Rehabilitation 2024年第2期12卷 101-116页

作者： Eric f. tanlaka torri trojand f.culty of.Nursing University of Windsor Windsor Canada

Background: Stroke survivors who exhibit impaired cognition at admission to inpatient rehabilitation may experience participation challenges and poorer f.nctional outcomes than those without impaired cognition. Dif.erences in f.nctional outcomes between stroke survivors with and without impaired cognition may be attributed to age, level of.cognitive impairment, and severity of.stroke. Materials and Methods: A retrospective secondary data analysis was conducted using health-related administrative data acquired f.om a Southwestern Ontario hospital’s stroke rehabilitation database. the aim was to explore potential linkages between post-stroke impaired cognition and f.nctional gains, rehabilitation stays, and living settings af.er discharge f.om rehabilitation. Results: An aggregate sample of.393 males and 314 f.males subclassif.ed as experiencing mild, moderate, and severe stroke was analyzed. At inpatient rehabilitation admission, 21.5% (n = 152) of.these patients had no impaired cognition, 33.7% (n = 238) had mild impaired cognition, 22.2% (n = 157) had moderate impaired cognition, and 22.6% (n = 160) had severe impaired cognition. Cognitively impaired stroke patients were signif.cantly (p 0.001) older, had (mostly) moderate to severe stroke with signif.cantly (p = 0.012) more moderate cognitive impairment, had signif.cantly (p 0.001) longer rehabilitation stays, and a high propensity f.r being discharged to longer-term care f.cilities compared to non-cognitively impaired patients. Conclusion: Presence of.signif.cant dissimilarity in rehabilitation stays and post-discharge destinations among stroke survivors with and without cognitive impairment is attributed to the age of.the patient, level of.cognitive impairment, and rigorous rehabilitation interventions.

关键词： Stroke Impaired Cognition Inpatient Rehabilitation f.nctional Outcomes

thin-Shell Wormholes Admitting Conf.rmal Motions in Spacetimes of.Embedding Class One

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of.Astronomy and Astrophysics 2024年第3期14卷 162-171页

作者： Peter K. f. Kuhf.ttig Department of.Mathematics Milwaukee School of Engineering Milwaukee USA

this paper discusses the f.asibility of.thin-shell wormholes in spacetimes of.embedding class one admitting a one-parameter group of.conf.rmal motions. It is shown that the surf.ce energy density σis positive, while the surf.ce pressure is negative, resulting in , thereby signaling a violation of.the null energy condition, a necessary condition f.r holding a wormhole open. f.r a Morris-thorne wormhole, matter that violates the null energy condition is ref.rred to as “exotic”. f.r the thin-shell wormholes in this paper, however, the violation has a physical explanation since it is a direct consequence of.the embedding theory in conjunction with the assumption of.conf.rmal symmetry. these properties avoid the need to hypothesize the existence of.the highly problematical exotic matter.

关键词： thin-Shell Wormholes Conf.rmal Symmetry Embedding Class One Exotic Matter