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美国的大坝安全

大坝与安全 1988年第Z1期 99-106页

作者： Robert b.jansen,金忠青美

在美国,大坝安全开始受到应有的重视。十九世纪的绝大部分时期,大坝建设者的精力一直集中于建造大坝以求防洪、供水、发电和达到其它目的。许许多多的大坝建造起来,其中不少大坝年代已久,若干大坝工况恶劣,至少是工况可疑。多年以来,大... 详细信息

在美国,大坝安全开始受到应有的重视。十九世纪的绝大部分时期,大坝建设者的精力一直集中于建造大坝以求防洪、供水、发电和达到其它目的。许许多多的大坝建造起来,其中不少大坝年代已久,若干大坝工况恶劣,至少是工况可疑。多年以来,大坝建设在实践中取得了长足进展;现在,我们应当集中精力保证现有的大坝继续发挥其功能,杜绝不应有的生命财产危险。

关键词：大坝安全溃坝垮坝水利工程事故溢洪道泄水建筑物美国美利坚合众国北美洲

Validation of the Wii balance board to assess static balance during dual-task activity in healthy subjects

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Medicine in Novel Technology and Devices 2019年第1期1卷 2-7页

作者： b.bonnechère O.Van Hove b.jansen S.Van Sint Jan Laboratory of Anatomy Biomnechanics and Organogenesis(LABO)Universite Libre de BruxellesBrusselsBelgium Department of Electronics and Informatics-ETRO Vrije Universiteit BrusselBrusselsBelgium Imec LeuvenBelgium Chest and Thoracic Surgery Department Erasme HospitalBrusselsBelgium

Objective:Although dual-task paradigm is commonly used in rehabilitation there is,currently,a lack of information about quantitative balance assessment performed in dual-task *** aim of this study is to validate the use of the Nintendo Wii balance board(Wbb)to assess balance modifications induced by dual-task activity in healthy *** and methods:Seventy-five healthy participants(37±14 years old,173±8 cm,7316 kg,35 women)participated in this *** was recorded in control situation(baseline)and under two different cognitive tasks(verbal fluency and calculation).Each trial lasted for 60 s and were performed with eyes open and *** parameters were extracted based on center of pressure displacement based on a previously-validated *** tests were used to compare the different conditions followed by bonferroni’s *** was repeated one week after to assess the ***:Statistically significant differences were found comparing eyes open and closed *** the influence of dual-tasks statistically significant decrease of the balance was observed for both eyes open and closed conditions(increase of the total sway and the speed of displacement).Concerning the reproducibility all parameters shows good to excellent ICC values for the different ***:In this study,we demonstrated the validity of the Wbb to detect the effect of the dual-task on balance in healthy *** studies are needed to determine if such a kind of evaluation can be used in clinics with subjects at risk of falling.

关键词： balance Wii balance board Dual-task Cognition

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假捻变形的交络技术

国际纺织导报 1999年第3期27卷 9-10页

作者： W.Priemsch P.-b.jansen 吴庆 Enkatecnica公司

德国Enka tecnica公司制造的TD喷嘴系列适用于假捻变形工艺的新进展,本文介绍了该喷嘴的结构,以及变形纱的质量测定方法.

关键词：假捻变形喷嘴交络技术变形纱变形工艺

The use of cognitive mobile games to assess cognitive function of healthy subjects under various inspiratory loads

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Medicine in Novel Technology and Devices 2019年第1期1卷 22-26页

作者： O.Van Hove A.Van Muylem D.Leduc A.Legrand b.jansen V.Feipel S.Van Sint Jan bonnechèreb Chest and Thoracic Surgery Service Erasme HospitalBrusselsBelgium Department of Pneumology Erasme HospitalBrusselsBelgium Laboratory of Cardiorespiratory Physiology UniversitéLibre de BruxellesBrusselsBelgium Laboratory of Physiology Mons School of MedicineMonsBelgium Department of Electronics and Informatics-ETRO Vrije Universiteit BrusselBrusselsBelgium Imec LeuvenBelgium Laboratory of Functional Anatomy UniversitéLibrede BruxellesBrusselsBelgium Laboratory of Anatomy Biomechanics and Organogenesis(LABO)UniversitéLibrede BruxellesBrusselsBelgium

Objective:The aim of this work was to determine if scoring mechanisms embedded in cognitive mobile games(CMG)designed for cognitive training are sensitive enough to detect changes in cognitive function induced by various acute respiratory loads in healthy *** and methods:Thirty healthy subjects participated in this study(25±4 years old,13 women).A set of three brief CMG was used to assess cognitive function(Rush back,Must Sort,True Color)in control situation and at four different inspiratory loads(through a mouthpiece without resistance and with 10,50 and 70%of the maximal inspiratory pressure).Results:Statistically significant decreases in CMG scores were observed in Rush back(p=0.032)and True Color(p=0.002)when the subjects breathed through the mouthpiece without resistance compared to the control condition.A statistical difference was observed for Must Sort(p=0.003)between baseline and 10%of Inspiratory Threshold Load(ITL).Significant differences for the three games were observed between the baseline and 50%of ITL and between baseline and 70%of ***:CMG designed for cognitive training are sensitive in detecting transitional changes in cognitive function induced by low,medium and high acute respiratory loads in healthy *** offers interesting new possibilities for the assessment and long-term follow-up of patients suffering from chronic respiratory disease,since this type of assessment could easily be completed independently by patients in their own homes,and could be combined with rehabilitation exercises as an evaluative measure.

关键词： Cognitive function Assessment Mobile games Acute modification

Effect of Al_(2)O_(3)on the Mechanical Properties of(b_(4)C+Al_(2)O_(3))/Al Neutron Absorbing Materials

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1411-1420页

作者： J.X.Cai b.M.Shi N.Li Y.Liu Z.G.Zhang Y.N.Zan Q.Z.Wang b.L.Xiao Z.Y.Ma Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nuclear Equipment Division Beijing Institute of Nuclear EngineeringChina Nuclear Power Engineering Co.Ltd.Beijing 100840China Department of Materials Science School of Mechanical EngineeringShenyang UniversityShenyang 110044China

b_(4)C/Al composites are widely utilized as neutron absorbing materials for the storage and transportation of spent nuclear *** order to improve the high-temperature mechanical properties of b_(4)C/Al composites,in-situ nano-Al_(2)O_(3)was introduced utilizing oxide on Al powder *** this study,the Al_(2)O_(3)content was adjusted by utilizing spheroid Al powder with varying diameters,thereby investigating the impact of Al_(2)O_(3)content on the tensile properties of(b_(4)C+Al_(2)O_(3))/Al *** was found that the pinning effect of Al_(2)O_(3)on the grain boundaries could hinder the recovery of dislocations and lead to dislocation accumulation at high *** the result,with the increase in Al_(2)O_(3)content and the decrease in grain size,the high-temperature strength of the composites increased *** finest Al powder used in this investigation had a diameter of 1.4μm,whereas the resultant composite exhibited a maximum strength of 251 MPa at room temperature and 133 MPa at 350℃,surpassing that of traditional b_(4)C/Al composites.

关键词： Al matrix composites Neutron absorbing materials (b_(4)C+Al_(2)O_(3))/Al composites High-temperature strength

Rare earth-doped mixed Ni-Cu-Zn ferrites as an effective photocatalytic agent for active degradation of Rhodamine b dye

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Journal of Rare Earths 2024年第3期42卷 488-496,I0003页

作者： Swapnil A.Jadhav Sandeep b.Somvanshi Sudarshan S.Gawali Kranti Zakde K.M.Jadhav Department of Physics Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad431004MaharashtraIndia School of Materials Engineering Purdue UniversityWest Lafayette 47906USA University Department of basic and Applied Sciences MGM UniversityAurangabad431003MaharashtraIndia

In this study, a series of Gd^(3+)-doped mixed Ni-Cu-Zn ferrites with composition of Zn_(0.5)Ni_(0.3)Cu_(0.2)Fe_(2-x)Gd_(x)O_(4)(x = 0, 0.025, 0.05, 0.075, 0.1) was prepared using self-ignition sol-gel method. The prepared nanoparticles with an average size ranging from 22 to 26 nm show a single-phase cubic structure belonging to the spinel matrix. A rise in the Gd^(3+)concentration leads to an increase in crystallite size and lattice parameter. In Fourier transform infrared spectra, two main absorption bands belonging to the spinel structure are observed. The high-frequency bands(v_(1)) represent the tetrahedral complex, while the lowfrequency bands(v_(2)) signify the octahedral complex. The optical bandgap of the nanoferrites is found within the range of 2.91 to 2.41 eV, depending on their size. The magnetic characteristics of the material,such as saturation magnetization and coercivity are significantly altered with the concentration of Gd^(3+)in the solution. Using Rhodamine b(Rhb) as a model organic pollutant, an in-depth investigation of the photocatalytic activity of the compounds was carried out. The present outcomes show that adding an adequate amount of Gd^(3+)significantly enhances the number of hydroxyl radicals produced by the ferrite,in turn, increasing the photocatalytic activity of the material. Mechanism elucidated by scavenger studies reveals that ·OH and holes are the primary reactive radicals responsible for the degradation *** photocatalysts show an insignificant performance loss in five consecutive cycles. Thus, it is concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater.

关键词： Gd^(3+)substitution Spinel ferrite Structural properties Magnetic properties Photocatalysis Rare earths

black hole shadows in Einstein-bel-Robinson gravity

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Chinese Physics C 2024年第5期48卷 272-283页

作者： b.Hamil b.C.Lütfüoğlu Laboratoire de Physique Mathématique et Subatomique Facultédes Sciences ExactesUniversitéConstantine 1ConstantineAlgeria Department of Physics University of Hradec KrálovéRokitanského 6250003 Hradec KrálovéCzechia

Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-bel-Robinson (EbR) gravity with quartic curvature modification motivated Sajadi et al. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EbR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.

关键词： black hole shadows Einstein-bel-Robinson gravity plasma

Soils in extraterrestrial space: Need for studies under microgravity

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Pedosphere 2024年第1期34卷 13-14页

作者： M.b.KIRKHAM Department of Agronomy Kansas State UniversityManhattan KS 66506USA

With the increased interest of plants in space, gravity cannot be ignored when studying soil-plant-water relations. Therefore, it is important to understand the water relations of soils under zero gravity in space or under reduced gravity on the Moon or Mars. This paper outlines the problems of moving water in soils under zero gravity or microgravity, as well as growing plants in these soils. It is suggested that microgravity experiments could be done on Earth using both soils and plants. Results from such experiments could be used to grow plants when mankind establishes bases on the Moon and Mars.

关键词： soils soil bases

Water Vapor Information from Satellite and Its Applications

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Advances in Atmospheric Sciences 2024年第1期41卷 188-189页

作者： b.J.SOHN School of Earth and Environmental Sciences Seoul National UniversitySeoul 08826Korea

Water vapor is a critical component of the hydrological cycle because it plays a vital role in transporting water from one part of the cycle to *** vapor evaporated from surfaces such as oceans,lakes,and rivers conden... 详细信息

关键词： motion oceans lakes