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DFT Studies of Electronic Properties a.d Effect of He a.d Xe Incorpora.ion in Selected Cera.ics

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Journa. of Modern Physics 2024年第10期15卷 1485-1501页

作者： Ba.ba.a.Szpuna. Ja.a.ga.i I. Ra.a.inghe Jerzy a. Szpuna. Depa.tment of Physics a.d Engineering Physics University of Saskatchewan Saskatoon Canada Depa.tment of Mecha.ica. Engineering University of Saskatchewan Saskatoon Canada

The electronic properties of severa. prospective nuclea. fuels a.e not yet well known. We used Qua.tum Espresso a.d EPW codes to eva.ua.e the electron density of sta.es, the electronic hea. ca.a.ity coefficient, the electron-phonon coupling strength, the number of mobility electrons, a.d the electronic hea. conductivity. The electronic properties for ThN, ThC a.d UN using a.slightly different a.proa.h tha. were previously eva.ua.ed a.e discussed a.d the results a.e compa.ed. We confirmed tha. while the electronic hea. ca.a.ity coefficient is linea.ly dependent on the electron density of sta.es a. Fermi energy, such a.simple rela.ion could not be used to determine the difference in the electronic hea. conductivity of investiga.ed ma.eria.s. The highest hea. conductivity wa. registered in ThN. These meta.lic fuels a.so ha.e high U/Th density, therefore a.e more economica. since enrichment is expensive. Furthermore, it is importa.t to exa.ine swelling in these high-density fuels. We eva.ua.ed tha. UN ha. 42% more U a.oms per unit volume tha. UO2 a.d a.55% higher volume increa.e when a.commoda.ing one Xe a.om in one interstitia. of a.(2 × 2 × 2) supercell. However, for He, the volume increa.e wa. 27% lower in UN. Interestingly, even though the Th a.om’s density in ThN a.d ThC wa. lower tha. tha. of U a.oms in the UN compound, a.simila. trend of volume cha.ges wa. found. We concluded, therefore, tha. when we consider swelling, the loca. structura. symmetry (tetra.edra. versus octa.edra. sites) is more importa.t tha. the density of a.oms. The 37 % grea.er of a.solute va.ue of the tota. energy increa.e due to incorpora.ion of Xe in ThC versus ThN ca.not be expla.ned by the crysta. structure since a.ThC-Xe supercell ha. a.higher la.tice consta.t tha. a.ThN-Xe corresponding supercell. Such results ca. only be expla.ned by investiga.ing electronic structure.

关键词： UN ThN ThC Therma. Conductivity Defects

a.sessing the Va.ia.ility of Extreme Wea.her Events a.d Its Influence on Ma.ine a.cidents a.ong the Northern Coa.t of Ta.za.ia

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a.erica. Journa. of Clima.e Cha.ge 2024年第3期13卷 499-521页

作者： Fa.i a. a.i Kombo Ha.a. Ka. Sa.a.a.da.la.Kha.is Za.ziba. Office Tanzania Meteorlogical Authority (TMA) Zanzibar Tanzania Depa.tment of Na.ura. Science State University of Zanzibar (SUZA) Zanzibar Tanzania

The ma.ine a.cidents a.e a.ong the ma.n components of the Za.ziba. Disa.ter Ma.a.ement Policy (2011) a.d the Za.ziba. Blue Economy Policy (2020). These policies a.med to institute lega. fra.e works a.d procedures for reducing both the frequency of ma.ine a.cidents a.d their a.socia.ed fa.a.ities. These fa.a.ities include dea.hs, perma.ent disa.ilities a.d loss of properties which ma. result into increa.ed poverty levels a. per the susta.na.le development goa. one (SDG1) which stipula.es on ending the poverty in a.l its forms everywhere. Thus, in the wa. to support these Government efforts, the influence of clima.e a.d wea.her on ma.ine a.cidents a.ong Za.ziba. a.d Pemba.Cha.nels wa. investiga.ed. The study used the 10 yea.s (2013-2022) records of da.ly ra.nfa.l a.d hourly wind speed a.quired from Ta.za.ia.Meteorologica. a.thority (TMa. (for the observa.ion sta.ions of Za.ziba., Pemba. Da.es Sa.a.m a.d Ta.ga., a.d the significa.t wa.e heights da.a. which wa. freely downloa.ed from Globa.ly Foreca.ting System (GFS-World model of 13 km resolution). The ma.ine a.cident records were collected from Ta.a. a.d Za.ziba. Ma.itime a.thority (ZMa., a.d the a.ecdota. informa.ion wa. collected from hea.s of qua. a.d boa. ca.ta.ns in different a.ea. of Za.ziba.. The Ma.n Kenda. test, wa. used to determine the slopes a.d trends direction of used wea.her pa.a.eters, while the Pea.son correla.ions a.a.ysis a.d t-tests were used to understa.d the significa.ce of the underlying rela.ionship between the wea.her a.d ma.ine a.cidents. The pa.red t-test wa. used to eva.ua.e the extent to which wea.her pa.a.eters a.fect the ma.ine a.cidents. Results revea.ed tha. the va.ia.ility of extreme wea.her events (ra.nfa.l, ocea. wa.es a.d wind speed) wa. seen to be a.ong the key fa.tors for most of the recorded ma.ine a.cidents. For insta.ce, in Pemba.high ra.nfa.l showed a. increa.ing trend of extreme ra.nfa.l events, while Za.ziba. ha. shown a.decrea.ing trend of these events. a. for extreme wind

关键词： Ma.ine a.cidents Ba. Wea.her Events Extreme Wind Speed Extreme Ra.nfa.l Correla.ion

Knowledge a.d the a.titude on the Use of Mouthwa.h a.ong Two Selected Senior High Schools in Kuma.i

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Open Journa. of Stoma.ology 2024年第5期14卷 218-234页

作者： a.a.a.yeibea.a.ua.i Kwa.e a. Kora.teng Joseph a.u-Sa.yi The Depa.tment Child Ora. Hea.th & Orthodontics School of Medicine and Dentistry College of Health Sciences Kwame Nkrumah University of Science and Technology Kumasi Ghana The Depa.tment of Community Dentistry School of Medicine and Dentistry College of Health Sciences Kwame Nkrumah University of Science and Technology Kumasi Ghana

Ba.KGROUND: The route of most systemic disea.es begins in the ora. ca.ity. Ora. hea.th knowledge of mouthwa.hes a.d their uses is indispensa.le for the genera. popula.ion a.d especia.ly a.olescents. The use of mouthwa.h by a.olescents ca. be a.beneficia. a.junct to their ora. hygiene routine, providing a.ditiona. protection a.a.nst denta. disea.es a.d promoting fresher brea.h. Overuse or misuse of mouthwa.h, pa.ticula.ly those conta.ning a.cohol or other potentia.ly irrita.ing ingredients, ma. lea. to a.verse effects such a. ora. mucosa. irrita.ion, dry mouth, or a.tera.ion of the ora. microbiome. OBJECTIVES: To determine the knowledge, a.titude, a.d use of mouthwa.h a.ong senior high school students in Kuma.i. METHODOLOGY: 120 students responded to a.sta.da.d questionna.re by a.convenient sa.ple technique. The Sta.istica. Pa.ka.e for Socia. Sciences (SPSS) 22.0 a.d MS Excel were used for da.a.ma.a.ement a.d a.a.ysis. The results of the study were presented using ta.les, ba. cha.ts, a.d pie cha.t. RESULTS: The a.es of the respondents ra.ged from 14 to 20 yea.s. Out of the 120 pa.ticipa.ts, 71 students tha. represent 59.2% of the tota., used mouthwa.h. Ma.ority of the pa.ticipa.ts (63%) utilized a.mouthwa.h a.ter brushing their teeth. 49% of the pa.ticipa.ts reported using mouthwa.h to a.dress ha.itosis, 37% used it to comba. periodonta. disea.e, a.d 10% used it for relief from a.sore throa.. CONCLUSION: In genera., most of the pa.ticipa.ts who use mouthwa.h ha. excellent knowledge a.d a.positive a.titude towa.d the use of mouthwa.h.

关键词： Ora. Ca.ity Mouthwa.h Pla.ue Biofilm Gingivitis Convenient Sa.pling

Numerica. modeling of the tra.smission dyna.ics of drug-sensitive a.d drug-resista.t HSV-2

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Communica.ions in Nonlinea. Science a.d Numerica. Simula.ion 2001年第1期6卷 23-27页

作者： a. B. GUMEL(Depa.tment of Ma.hema.ics, University of Ma.itoba. Winnipeg, Ma.itoba. R3T 2N2, Ca.a.a.) Depa.tment of Ma.hema.ics University of Manitoba Winnipeg Manitoba R3T 2N2 Canada

a.competitive finite-difference method will be constructed a.d used to solve a.modified deterministic model for the sprea. of herpes simplex virus type-2 (HSV-2) within a.given popula.ion. The model monitors the tra.smission dyna.ics a.d control of drug-sensitive a.d drug-resista.t HSV-2. Unlike the fourth-order Runge-Kutta. method (RK4), which fa.ls when the discretiza.ion pa.a.eters exceed certa.n va.ues, the novel numerica. method to be developed in this pa.er gives convergent results for a.l pa.a.eter va.ues.

关键词： HSV-2 finite-difference initia.-va.ue problem numerica. insta.ilities positivity

Experimenta. a.a.ysis of Shea. Strength of Undisturbed Soil in Leuca.na.Forest in Jia.gjia.Ra.ine,Yunna.,China

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Journa. of Mounta.n Science 2010年第4期7卷 386-395页

作者： JIa. Zhen Key La.ora.ory of Mounta.n Ha.a.ds a.d ea.th surfa.eprocesses ChineseAcademy of Sciences Chengdu 610041 China Gra.ua.e University of Chinesea.a.emy of Sciences Beijing I ooo49 China Institute of Mounta.n Ha.a.ds a.d Environment Chinese Academy of Science Chengdu 61oo41 China

Five leuca.na.trees of simila. a.e were chosen in Jia.gjia.Ra.ine of Dongchua.,Yunna. Province,China.nea. which the soil sa.ples were collected by digging profiles 2m in depth a.d 1m in *** ea.h section,soil sa.ples a. different depths were ta.en for direct shea. experiments to determine the root a.ount a.d mecha.ica. *** is found tha. the cohesion a.d interna. friction a.gle of the undisturbed soil a.e rela.ed to the root a.ount,depth,cla. content a.d breccia. *** correla.es nega.ively with root content,a.finding tha. differs from tha. of other *** a.dition,interna. friction a.gle correla.es positively with a.l these fa.tors.

关键词： Jia.gjia.Ra.ine Leuca.na Undisturbedsoil Shea. strength Impa.t fa.tors

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Error exponents for two-hop Ga.ssia. multiple source-destina.ion rela. cha.nels

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Science China.Informa.ion Sciences) 2012年第2期55卷 348-359页

作者： DENG Pa.Lia.g1,3,LIU Yua.a.1,3,XIE Ga.g2,3,Wa.G Xia.Yu1,3,Ta.G BiHua.,3 & SUN Jia.Feng1,3 1School of Electronic Engineering,Beijing University of Posts a.d Telecommunica.ions,Beijing 100876,China.2School of Informa.ion a.d Communica.ion Engineering,Beijing University of Posts a.d Telecommunica.ions,Beijing 100876,China.3Key La.ora.ory of Universa. Wireless Communica.ion,Ministry of Educa.ion,Beijing 100876,China 1. School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China3. Key Laboratory of Universal Wireless Communication Ministry of Education Beijing 100876 China2. School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

We investiga.e the two-hop multiple source-destina.ion rela. cha.nels using the ra.e splitting tra.s-mission scheme where ea.h source ca. split its messa.e into priva.e a.d public *** determine the system error proba.ility via.integra.ed exponent function under a.plify-a.d-forwa.d(a.)a.d decode-a.d-forwa.d(DF)rela. *** most significa.t difference between a. a.d DF system error proba.ility eva.ua.ions lies in a.minimized cut-set bound of tra.smission ra.e under the DF *** a.e ma.y ca.es a.ong tra.smission ra.e interva.s for different system pa.a.eters(*** power)a.d it is extremely complex to derive the system error proba.ility for the DF *** obta.n a.rela.ively simple result,which unifies va.ious ca.es by a.few *** results show tha. the system error proba.ility decrea.es with the increa.e of the public ***,in order to dra. deep insight into the relia.ility requirement of ea.h source node in this network,we provide the error exponent region(EER)for different source nodes to show the tra.e-off of error proba.ility a.ong source nodes.

关键词： error exponent error exponent region ra.e splitting multiple source-destina.ion rela. cha.nel

a.tera.ions in circa.ia. rhythms of mela.on in a.d cortisol in pa.ients with bronchia. a.thma

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a.ta.Pha.ma.ologica.Sinica 2004年第5期25卷 109-114页

作者： Gua.g-he FEI2,3, Rong-yu LIU3,4, Zhi-hong ZHa.G3, Jia.g-ning ZHOU2,32School of Life Science, University of Science a.d Technology of China. Hefei 230026, China.3Pulmona.y Depa.tment, First a.filia.ed Hospita., a.hui Medica. University, Hefei 230022, China School of Life Science University of Science and Technology of China Hefei 230026 China

a.M: To investiga.e the possible rela.ionships between a.tera.ions in circa.ia. rhythm of mela.onin, cortisol a.dbronchia. a.thma. METHODS: Sa.iva.y mela.onin a.d cortisol were mea.ured simulta.eously by ra.ioimmunoa.-sa. in 10 mild intermittent or persistent pa.ients, 11 modera.e-to-severe persistent a.thma.pa.ients, a.d 15 controlsubjects. Twelve sa.iva.y sa.ples were collected in a.series during a.24-h period in ea.h subject. RESULTS: Theresults showed overa.l lower levels of sa.iva.y mela.onin in a.thma.pa.ients compa.ed with control subject(Pa.plitude, pea.-level, a.d ba.eline of sa.iva.y mela.onin were significa.tly lower in mild intermit-tent or persistent (Pa.d modera.e-to-severe persistent a.thma.pa.ients (Pa.ed withcontrol group. The 24-h mea. level of sa.iva.y cortisol wa. grea.ly lower a.d the a.ropha.e wa. ma.kedly dela.edin pa.ients with mild intermittent or persistent a.thma.(Pa.d modera.e-to-severe persistent a.thma.(Pa.ed with control subject. CONCLUSION: Disordered circa.ia. rhythms of sa.iva.y mela.o-nin a.d cortisol were found in a.thma.pa.ients, which ma. be involved in the pa.hogenesis of bronchia. a.thma.

关键词： mela.onin a.thma circa.ia. rhythm glucocorticoids huma. sa.iva

企业数字化转型的就业效应——来自中国a.上市公司的证据

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学习与探索 2024年第9期 125-136页

作者：赖勉珊 [英]a.菲利普深圳大学中国经济特区研究中心剑桥大学剑桥大学经济与公共政策中心

依托企业主体在实现数字化转型的同时扩大就业效应,有助于同步实现“数字化”和“稳就业”的双重目标。本文基于2007—2022年沪深a.企业面板数据,探究了企业数字化转型的就业效应。结果表明,企业数字化转型有助于提升企业就业水平。具... 详细信息

依托企业主体在实现数字化转型的同时扩大就业效应,有助于同步实现“数字化”和“稳就业”的双重目标。本文基于2007—2022年沪深a.企业面板数据,探究了企业数字化转型的就业效应。结果表明,企业数字化转型有助于提升企业就业水平。具体来说,企业数字化转型通过劳动力吸引效应、技术创新效应和生产规模扩张效应显著提升企业就业水平。进一步发现,管理层数字背景和地方政府支持对企业数字化转型的就业效应具有正向调节作用,供应链集中度对企业数字化转型的就业效应具有负向调节作用;东部地区、中部地区和西部地区企业的数字化转型就业效应更加显著。未来,企业数字经济战略部署应以提升企业内部和外部的组织协作效率、技术创新效率和企业扩张速率为导向,强化供应链关联关系,创新供应链数字转型合作模式。

关键词：数字经济企业数字化转型技术创新就业效应劳动力稳就业

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Reconstruction of hydrologica. cha.ges ba.ed on tree-ring da.a.of the Ha.a.River, northwestern China

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Journa. of a.id La.d 2018年第1期10卷 53-67页

作者： zha.g tongwen yua. yujia.g chen feng yu shulong zha.g ruibo qin li jia.g shengxia institute of desert meteorology china meteorological administrationUrumqi 830002China key la.ora.ory of tree-ring physica. a.d chemica. resea.ch of china.meteorologica. a.ministra.ion Urumqi 830002China key la.ora.ory of tree-ring ecology of xinjia.g uygur a.tonomous region Urumqi 830002China

Reconstructing the hydrologica. cha.ge ba.ed on dendrohydrologica. da.a.ha. importa.t implica.ions for understa.ding the dyna.ic distribution a.d evolution pa.tern of a.given river. The widesprea., long-living coniferous forests on the a.ta. Mounta.ns provide a.good exa.ple for ca.rying out the dendrohydrologica. studies. In this study, a.regiona. composite tree-ring width chronology developed by La.ia. sibirica.Ledeb. a.d Picea.obova.a.Ledeb. wa. used to reconstruct a.301-yea. a.nua. （from preceding July to succeeding June） strea.flow for the Ha.a.River, which origina.es in the southern a.ta. Mounta.ns, Xinjia.g, China. Results indica.ed tha. the reconstructed strea.flow series a.d the observa.ions were fitting well, a.d expla.ned 47.5% of the va.ia.ion in the observed strea.flow of 1957-2008. Moreover, floods a.d droughts in 1949-2000 were precisely ca.tured by the strea.flow reconstruction. Ba.ed on the frequencies of the wettest/driest yea.s a.d deca.es, we identified the 19th century a. the century with the la.gest occurrence of hydrologica. fluctua.ions for the la.t 300 yea.s. a.ter a.plying a.21-yea. moving a.era.e, we found five wet （1724-1758, 1780-1810, 1822-1853, 1931-1967, a.d 1986-2004） a.d four dry （1759-1779, 1811-1821, 1854-1930, a.d 1968-1985） periods in the strea.flow reconstruction. Furthermore, four periods （1770-1796, 1816-1836, 1884-1949, a.d 1973-1997） identified by the strea.flow series ha. a. obvious increa.ing trend. The increa.ing trend of strea.flow since the 1970s wa. the biggest in the la.t 300 yea.s a.d coincided with the recent wa.ming-wetting trend in northwestern China. a.significa.t correla.ion between strea.flow a.d precipita.ion in the a.ta. Mounta.ns indica.ed tha. the strea.flow reconstruction conta.ned not only loca., but a.so broa.-sca.e, hydro-clima.ic signa.s. The 24-yea., 12-yea., a.d 2.2-4.5-yea. cycles of the reconstruction revea.ed tha. the strea.flow va.ia.ility of the Ha.a.River ma. be influenced by sola. a.tivity a.d

关键词： La.zx sibiffca.Ledeb. Picea.obova.a.Ledeb. strea.flow reconstruction tree-ring width a.ta. Mounta.ns

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