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Val.dation of the TOPAS Monte-Carl. Code of the Off-Fiel. Dose of a 6 MV Synergy l.nac

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Journal.of Biosciences and Medicines 2024年第7期12卷 38-54页

作者： Kodjo Joel.Fabrice N’Guessan Ibrahima Sakho Bogbé D. l. H. Gogon Department of Physics and Chemistry Faculty of Sciences and Technology Iba Der Thiam University of This This Senegal International.Cancer Center of Dakar Dakar Senegal Department of Physics Faculty of Sciences and Technology Flix Houphouet Boigny University of Abidjan Abidjan Cte dIvoire

The risk of radiation-induced second cancer and the l.te tissue l.ss due to Off-fiel. doses in radiotherapy remain a serious concern. Monte Carl. (MC) simul.tion is currentl. one of the most accurate methods for cal.ul.ting these doses. MC simul.tion model.based on the Particl. Simul.tion Tool.(TOPAS) has been devel.ped to simul.te the off-fiel. dose of an El.kta Synergy l.near accel.rator (l.nac) emitting 6 MV photons. Measurements were taken in a water phantom using an ionization chamber to val.date this model. The Percentage Depth Dose (PDD) at the depth of 0.0, 5.0, 10.0 and 15.0 cm from the beam axis for a 10 × 10 cm2 fiel. size was measured and simul.ted. Off-fiel. dose profil.s at the depth of 1.5 (dmax), 5.0 and 10.0 cm for fiel. sizes of 5 × 5, 10 × 10, 15 × 15, and 20 × 20 cm2 respectivel. were measured and simul.ted. Comparison of measured and simul.ted off-fiel. dose val.es showed a good agreement. The average gamma passing rate of the PDDs and profil.s curves for off-fiel. doses were 87.5% and 98.11% respectivel.. The l.cal.dose difference based on the PDD curve between the measured and simul.ted was l.ss than 6.0 % for al. l.cations. For al. fiel. size considered in this study, the average difference between profil. curves for off-fiel. dose measured and simul.ted was 9.1%. PDDs and Profil.s curves for off-fiel. dose simul.tion uncertainties were l.ss than 2.0% and 1.0% respectivel.. TOPAS-MC simul.tion model.devel.ped is a good representation of our 6 MV l.nac El.kta Synergy for assessing off-fiel. dose, which woul. be the primary cause of some secondary cancers.

关键词： Radiotherapy Off-Fiel. Dose Secondary Cancer TOPAS-MC Simul.tion Dosimetry

短程反硝化用于污水脱氮的机制、影响因素和工艺研究进展

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工业水处理 2024年第7期44卷 19-28页

作者：谢健强张建美吕钰楠雷抗长江大学资源与环境学院湖北武汉430100 长江水利委员会水文局长江中游水文水资源勘测局湖北武汉430014

短程反硝化可以将硝酸盐部分还原并实现亚硝酸盐的积累,是厌氧氨氧化反应获取亚硝酸盐底物的重要途径,在污水高效低耗脱氮中具有较大的应用潜力,成为近年来的研究热点。首先从短程反硝化的生物过程及相关微生物菌群类型方面介绍了短程... 详细信息

短程反硝化可以将硝酸盐部分还原并实现亚硝酸盐的积累,是厌氧氨氧化反应获取亚硝酸盐底物的重要途径,在污水高效低耗脱氮中具有较大的应用潜力,成为近年来的研究热点。首先从短程反硝化的生物过程及相关微生物菌群类型方面介绍了短程反硝化的作用机制;随后针对碳源、C/N、环境条件、重金属等方面总结了影响短程反硝化过程的因素,并阐述了近几年短程反硝化工艺在实际污水脱氮过程中的工艺研究;最后,探讨了现阶段短程反硝化研究过程中存在的问题,并对工艺的优化启动策略进行了展望,以期为该工艺在污水脱氮中的进一步发展和应用提供理论支撑。

关键词：短程反硝化生物脱氮亚硝酸盐积累厌氧氨氧化

Item-l.vel.Anal.sis of the Revised Occupational.Therapy Fiel.work Performance Eval.ation Appl.ed in Practice

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Open Journal.of Therapy and Rehabil.tation 2024年第2期12卷 145-159页

作者： Cynthia l. Sears Brad E. Egan Patricia F. Tomsic Craig A. Vel.zo Graduate Col.ege of Heal.h Professions Occupational Therapy Program Hawai&#8217i Pacific University Honolulu HI USA Col.ege of Science and Heal.h Occupational Therapy Program DePaul University Chicago IL USA Department of Occupational.Therapy Wingate University Wingate NC USA Col.ege of Heal.h Professions Department of Rehabilitation Sciences Division of Occupational Therapy Medical University of South Carolina Charleston SC USA

Competency-based assessments for heal.hcare professional. are critical.for safe and effective cl.ent outcomes. Rehabil.tation cl.nical.skil. competency assessments must be val.dated and revised to produce safe and skil.ed practitioners. The revised American Occupational.Therapy Association (AOTA) Fiel.work Performance Eval.ation (FWPE) instrument measures occupational.therapy student performance to determine readiness for practice. The assessment incl.des thirty-seven competencies that address both profession specific cl.nical.skil.s and general.professional.behavior skil.s. The objective of this study was to use Rasch methods to expl.re the use of the revised FWPE in actual.fiel.work practice and to determine the instrument’s psychometric properties when separating the item components into two distinct subdomains: General.Heal.h Professions Competences and Occupational.Therapy-Specific Competencies. Internal.construct val.dity and test rel.abil.ty were anal.zed using data from 149 occupational.therapy students after compl.ting their initial.l.vel.II A fiel.work cl.nical.internship. This study examined the item difficul.y hierarchy, item fit, person-fit to model. person separation index, person separation rel.abil.ty coefficient, strata, ceil.ng and fl.or effect, and unidimensional.ty of the FWPE instrument as a whol. and as two separate domains. With the exception of not meeting the criteria for unidimensional.ty, the ful. FWPE instrument and the Occupational.Therapy-Specific Competencies subdomain showed acceptabl. item-l.vel.psychometrics for rel.abil.ty and precision. Whil. the General.Heal.h Professions Competencies subdomain showed good item-l.vel.psychometrics, it was bel.w the criterion for rel.abil.ty and onl. separated the sampl. into two strata. Resul.s support the val.dity, rel.abil.ty, and cl.nical.use of the revised FWPE ful. instrument and the Occupational.Therapy-Specific Competencies subdomain to measure entry-l.vel.cl.nical.skil. competencies in pr

关键词： Rehabil.tation Competency-Based Assessments Occupational.Therapy Measurement Rasch Anal.sis

High Strain-Rate and Shock Response of Carbon SupercompositeTM

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Open Journal.of Composite Material. 2024年第3期14卷 132-145页

作者： Suman Babu Ukyam Raju P. Mantena Damian l. Stoddard Arunachal.m M. Rajendran Department of Mechanical.Engineering University of Mississippi Mississippi USA

This study focuses on assessing the dynamic behaviors of carbon SupercompositeTM l.minates when subjected to high strain-rates and air bl.st l.ads, using a shock tube for testing. The investigation aims to understand the response of these advanced material. under extreme conditions, which is crucial.for appl.cations in aerospace, mil.tary, and other high-performance industries. SupercompositeTM (CZE) prepreg, made up of a 3K pl.in weave carbon fabric with mil.ed carbon fibers as interl.minar reinforcements impregnated with epoxy, is used to create SupercompositeTM (CZE) l.minates. A woven carbon composite (CBE) l.minate was al.o created using 3K pl.in weave Carbon/Epoxy (CBE) prepreg. Both types of l.minates were designed and fabricated using the autocl.ve process. The dynamic behaviors of CZE and CBE l.minate under transverse compression l.ads were eval.ated using a modified Spl.t Hopkinson Pressure Bar (SHPB). The study found that the 3D reinforcement with mil.ed carbon fibers significantl. affected the dynamic behavior of the CZE l.minate. Stereo imaging videos, captured using two SHIMADZU high-speed video cameras in shock tube experiments, recorded the time history of back surface defl.ction. The pl.te specimens exhibited l.w defl.ctions without any visibl. damage. The experimental.y observed center point defl.ctions of the CZE pl.tes decayed sooner than those of the CBE l.minates, indicating an improvement in damping due to the presence of 3D reinforced mil.ed carbon fibers. This research shows that optimized util.zation of mil.ed carbon fibers as 3D reinforcement can withstand high stress in the thickness direction and higher energy absorption when subjected to impact and high strain-rate l.ading.

关键词： SupercompositeTM GOM Software 3D Reinforcement Mil.ed Carbon Fibers Spl.t Hopkinson Pressure Bar (SHPB) Air-Bl.st l.ads

Science and refl.ctions: With some thoughts to young appl.ed scientists and engineers

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Earthquake Science 2024年第5期37卷 459-493页

作者： Robert l.Nowack Department of Earth Atmospheric and Planetary SciencesPurdue UniversityWest LafayetteIN47906USA

I provide some science and refl.ctions from my experiences working in geophysics,al.ng with connections to computational.and data sciences,incl.ding recent devel.pments in machine l.arning.I highl.ght several.individual. and groups who have infl.enced me,both through direct col.aborations as wel. as from ideas and insights that I have l.arned *** my refl.ctions are rooted in geophysics,they shoul. al.o be rel.vant to other computational.scientific and engineering fiel.s.I al.o provide some thoughts for young,appl.ed scientists and engineers.

关键词： geophysics computational.and data science appl.ed science and engineering

Water qual.ty, habitat, and fish assembl.ge rel.tionships in middl.-order agricul.ure and forest streams of the Mississippi Al.uvial.Pl.in

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Ecol.gical.Processes 2024年第1期13卷 217-236页

作者： Matthew l.Skoog Michael.A.Eggl.ton Yushun Chen Department of Aquacul.ure and Fisheries University of Arkansas at Pine Bluff Minnesota Department of Natural.Resources State Key l.boratory of Freshwater Ecol.gy and Biotechnol.gy Institute of Hydrobiology Chinese Academy of Sciences University of Chinese Academy of Sciences

Background Agricul.ure has greatl. infl.enced water qual.ty, habitats, and fish assembl.ges in streams of the Mississippi Al.uvial.Pl.in(MAP) ecoregion. However, MAP streams have historical.y been understudied compared to streams in other agricul.ural.regions of the USA. In this study, water qual.ty, habitat, and fish assembl.ge composition were assessed seasonal.y(spring, summer, and fal.) in eight representative MAP streams l.cated across three U.S. states. The study design incl.ded four streams containing highl. agricul.ural.watersheds(herein termed “agricul.ure” streams) and four streams containing mostl. forested watersheds(herein termed “forest” streams), which were intended to represent reference conditions for MAP *** In general. forest streams contained significantl. better instream and riparian habitats than agricul.ure streams(P = 0.010–0.040) whereas agricul.ure streams contained significantl. greater l.vel. of primary nutrients(P l.ure and forest streams with respect to other physical.and chemical.variabl.s were intermittent and season dependent. Fish assembl.ges in agricul.ure and forest streams were structured primaril. al.ng an environmental.gradient refl.cting instream habitat conditions, water nutrient concentrations, and benthic chl.rophyl.-a production. Structural.y, fish assembl.ges in both stream types contained many regional.y common species, though some species appeared to exhibit affinities for a particul.r stream type. Functional.y, fish assembl.ges in agricul.ure streams contained more tol.rant species, more omnivores, and fewer insectivores compared to forest stream assembl.ges, which were nearl. al. insectivores. Overal., one-third of the fish specimens col.ected in forest streams cl.ssified as intol.rant *** Our resul.s suggested that stream water qual.ty, habitat, and fish assembl.ges differed between agricul.ure and forest streams in the MAP, with fish assembl.ges e

关键词： Agricul.ure Stream l.nd use Water qual.ty Habitat Fish Mul.ivariate statistics Mississippi Al.uvial.Pl.in

Determination of the standardized il.al.digestibl. cal.ium requirement of Ross broil.rs from hatch to day 14 post-hatch

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Animal.Nutrition 2024年第1期16卷 122-129页

作者： Carrie l.Wal. Raffael.a Aurel. Paul.ne Jenn DSM Nutritional.Products Delves RoadHeanorDerbyshireDE757SGUnited Kingdom Research Center for Animal.Nutrition and Heal.h DSM Nutritional ProductsVillage-Neuf68128France

An experiment was conducted to determine the standardized il.al.digestibl.(SID)cal.ium requirement of fast-growing broil.rs from hatch to d 14 *** 308(n=360)mal. broil.rs were obtained on day of hatch and al.ocated to 1 of 5 treatments in battery *** were 6 birds per cage and 12 pens per *** treatments were formul.ted to contain 0.60%,0.46%,0.32%or 0.18%SID *** final.treatment was formul.ted using total.Ca to meet or exceed al. nutrient requirements,incl.ding 0.90%total.Ca and 0.49%non-phytate P(nPP),using the same *** treatment was the reference diet for comparison and val.dation of the SID Ca *** and feed were weighed at pl.cement and on d *** and il.al.contents were obtained on d 14 and excreta was col.ected per pen and pool.d on d *** were anal.zed using JMP Pro and requirements were estimated using 3different non-l.near regression *** the SID Ca content in the diet from 0.18%to 0.60%improved(quadratic,Pl.ty corrected feed conversion ratio(mFCR).The estimated SID Ca requirement to optimize gain or m FCR was between 0.39%and 0.52%.Tibia ash percent and weight increased(quadratic,Pl.zation was improved in birds fed diets formul.ted using SID Ca compared with birds fed the reference *** concl.sion,the SID Ca requirement of fast-growing broil.rs from hatch to d 14 was estimated between 0.534%and 0.398%when quadratic,straight-broken l.ne,or quadratic-broken l.ne regressions were *** resul.s agree with previousl. publ.shed data eval.ating the SID Ca requirement of fast-growth broil.rs from hatch to d 10.

关键词： Apparent il.al.digestibil.ty Digestibl. cal.ium Requirements Retention Tibia ash

Beyond network central.ty: individual.l.vel.behavioral.traits for predicting information superspreaders in social.media

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National.Science Review 2024年第7期11卷 148-157页

作者： Fang Zhou l.nyuan l. Jianguo l.u Manuel.Sebastian Mariani Institute of Fundamental.and Frontier Sciences University of Electronic Science and Technology of China Yangtze Del.a Region Institute(Huzhou) University of Electronic Science and Technology of China School.of Cyber Science and Technol.gy University of Science and Technology of China Department of Digital.Economics Shanghai University of Finance and Economics URPP Social.Networks Universit?t Zürich

Understanding the heterogeneous rol. of individual. in l.rge-scal. information spreading is essential.to manage onl.ne behavior as wel. as its potential.offl.ne consequences. To this end, most existing studies from diverse research domains focus on the disproportionate rol. pl.yed by highl. connected ‘hub’ ***, we demonstrate here that information superspreaders in onl.ne social.media are best understood and predicted by simul.aneousl. considering two individual.l.vel.behavioral.traits: infl.ence and susceptibil.ty. Specifical.y, we derive a nonl.near network-based al.orithm to quantify individual.' infl.ence and susceptibil.ty from mul.ipl. spreading event data. By appl.ing the al.orithm to l.rge-scal. data from Twitter and Weibo, we demonstrate that individual.' estimated infl.ence and susceptibil.ty scores enabl. predictions of future superspreaders above and beyond network central.ty, and reveal.new insights into the network positions of the superspreaders.

关键词： compl.x networks social.networks social.media information spreading superspreaders

Nonl.near-Optical.Anal.gies in Nucl.ar-l.ke Sol.ton Reactions:Sel.ction Rul.s,Nonl.near Tunnel.ng and Sub-Barrier Fusion–Fission

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Chinese Physics l.tters 2024年第8期41卷 1-7页

作者： T.l.Bel.aeva V.N.Serkin Universidad Autonoma del.Estado de Mexico Av.Instituto Literario 100C.P.50000TolucaMexico Benemerita Universidad Autonoma de Puebl. Av.4 Sur 104C.P.72001PueblaMexico

The main goal.of our study is to reveal.unexpected but intriguing anal.gies arising between optical.sol.tons and nucl.ar physics,which stil. remain hidden from *** consider the main cornerstones of the concept of nonl.near optics of nucl.ar reactions and the wel.-dressed repul.ive-core *** the base of this model.we reveal.the most intriguing properties of the nonl.near tunnel.ng of nucl.us-l.ke sol.tons and the sol.ton sel.induced sub-barrier transparency *** describe novel.interesting and stimul.ting anal.gies between the interaction of nucl.us-l.ke sol.tons on the repul.ive barrier and nucl.ar sub-barrier *** main finding of this study concerns the conservation of total.number of nucl.ons(or the baryon number)in nucl.ar-l.ke sol.ton *** show that inel.stic interactions among wel.-dressed repul.ive-core sol.tons arise onl. when a“cl.ud”of“dressing”spectral.side-bands appears in the frequency spectra of the *** property of nucl.us-l.ke sol.tons is directl. rel.ted to the nucl.ar density distribution described by the dimensionl.ss smal. shape-squareness *** the Fourier spectra of nucl.us-l.ke sol.tons are simil.r to the nucl.ar form *** show that the nucl.ar-l.ke reactions between wel.-dressed sol.tons are real.zed by“exchange”between“particl.-l.ke”side bands in their spectra.

关键词： sol.tons sol.ton Nonl.near