检索结果-南通市图书馆

用远震P波背投影成像2009年4月6日意大利拉奎拉M_W6.3级地震的破裂

在线全文

学校读者我要写书评

暂无评论

世界地震译丛 2010年第5期41卷 10-15页

作者： S.D'Amico K.D.Koper r.b.herrmann A.Akinci L.Malagnini 康秀平郭安北核工业航测遥感中心

介绍了用远震P波背投影法得到的2009年4月6日拉奎拉MW6.3级地震的破裂详情。该方法此前用于大级别的地震,而此次是首次用于中等尺度的地震。我们处理了从美国地震学联合研究协会(IrIS)数据中心获得的60个宽带台站的垂向分量地震图。利... 详细信息

介绍了用远震P波背投影法得到的2009年4月6日拉奎拉MW6.3级地震的破裂详情。该方法此前用于大级别的地震,而此次是首次用于中等尺度的地震。我们处理了从美国地震学联合研究协会(IrIS)数据中心获得的60个宽带台站的垂向分量地震图。利用多通道互相关算法对记录迹线进行了排列及归一化处理,并运用第四次根叠加进行破裂成像。我们发现,拉奎拉地震破裂方向为南向,第2次的能量离散脉冲于标称发震时刻之后约17～18s发生在震中以东20～25km处。从图像上看,破裂的空间范围与该地区震后对破坏的测量结果非常吻合。由于该方法进行破裂成像速度快(破裂图像在发震时刻后20～30min便可得到),因此,可以将其用于政府机构的应急响应及救援工作中。

关键词：破裂方向投影成像远震P波地震图意大利发震时刻归一化处理互相关算法

2024 Wheelchair Compendium of Physical Activities:An update of activity codes and energy expenditure values

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第1期13卷 18-23页

作者： Scott A.Conger Stephen D.herrmann Erik A.Willis Tom E.Nightingale Joseph r.Sherman barbara E.Ainsworth Department of Kinesiology Boise State UniversityBoiseID 83725USA Kansas Center for Metabolism and Obesity research The University of Kansas Medical CenterKansas CityKS 66160USA Center for Health Promotion and Disease Prevention University of North Carolina at Chapel HillChapel HillNC 27599USA School of Sport Exercise and Rehabilitation SciencesUniversity of BirminghamBirmingham AL B152TTUK Centre for Trauma Sciences research University of BirminghamEdgbastonBirmingham AL B152TTUK College of Health Solutions Arizona State UniversityPhoenixAZ 85003USA School of Exercise and Health Shanghai University of SportShanghai 200438China

Purpose:This paper presents an update of the 2011 Wheelchair Compendium of Physical Activities designed for wheelchair users and is referred to as the 2024 Wheelchair *** Wheelchair Compendium aims to curate existing knowledge of the energy expenditure for wheelchair physical activities(PAs).Methods:A systematic review of the published energy expenditure of PA for wheelchair users was completed between 2011 and May *** added these data to the 2011 Wheelchair Compendium data that was compiled previously in a systematic review through ***:A total of 47 studies were included,and 124 different wheelchair PA reported energy expenditure values ranging from 0.8 metabolic equivalents for wheelchair users(filing papers,light effort)to 11.8 metabolic equivalents for wheelchair users(Nordic sit skiing).Conclusion:In introducing the updated 2024 Wheelchair Compendium,we hope to bridge the resource gap and challenge the prevailing narratives that inadvertently exclude wheelchair users from physical fitness and health PAs.

关键词： Disability Exercise MET Mobility

在线全文

学校读者我要写书评

暂无评论

地滚波:用自适应相位匹配滤波器进行抑制

油气藏评价与开发 1991年第1期 88-88页

作者： r.b.herrmann 严建文

用来弥散地面波的相位匹配滤波技术可被扩展来进行地震道上自身信号的自适应迭代处理,同时设计一个滤波器来消除地面波。该技术可靠。工作效果好,要使其工作只需简单的几个参数即可。三个地区的数据组应用此技术后均表现出很大范围的地... 详细信息

用来弥散地面波的相位匹配滤波技术可被扩展来进行地震道上自身信号的自适应迭代处理,同时设计一个滤波器来消除地面波。该技术可靠。工作效果好,要使其工作只需简单的几个参数即可。三个地区的数据组应用此技术后均表现出很大范围的地面波噪声与勘探信号的比。该技术不但能在数据组质量低劣的情况

关键词：数据组

Almost nonnegative curvature operator and cohomology rings

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2016年第5期11卷 1259-1274页

作者： Martin herrmann Fakultat fur Mathematik Karlsruher Institut fur Technologie Kaiserstraβe 89-93 76133 Karlsruhe Germany

We give a survey of results on the construction of and obstructions to metrics of almost nonnegative curvature operator on closed manifolds and results on the cohomology rings of closed, simply-connected manifolds with a lower curvature and upper diameter bound. The latter is motivated by a question of Grove whether these condition imply finiteness of rational homotopy types. This question has answers by F. Fang-X. rong, b. Totaro and recently A. Dessai and the present author.

关键词： Nonnegative curvature homogeneous spaces curvature operator almost nonnegative curvature

Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2008年第6期6卷 390-403页

作者： Fernando Alonso-Marroquín Hans b. Mhlhaus Hans J. herrmann Earth Systems Science Computational Centre & School of Physical Sciences The University of Queensland Earth Systems Science Computational Centre The University of Queensland Institut fr baustoffe ETH-HenggerbergZrich

We use a two-dimensional model of polygonal particles to investigate granular ratcheting. ratcheting is a long-term response of granular materials under cyclic loading, where the same amount of permanent deformation is accumulated after each cycle. We report on ratcheting for low frequencies and extremely small loading amplitudes. The evolution of the sub-network of sliding contacts allows us to understand the micromechanics of ratcheting. We show that the contact network evolves almost periodically under cyclic loading as the sub-network of the sliding contacts reaches different stages of anisotropy in each cycle. Sliding contacts lead to a monotonic accumulation of permanent deformation per cycle in each particle. The distribution of these deformations appears to be correlated in form of vortices inside the granular assembly.

关键词： Granular systems Dynamics and kinematics of rigid bodies Molecular dynamics methods

Calculating pH-dependent free energy of proteins by using Monte Carlo protonation probabilities of ionizable residues

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2012年第3期3卷 230-238页

作者： Qiang Huang Andreas herrmann State Key Laboratory of Genetic Engineering School of Life SciencesFudan UniversityShanghai 200433China Department of biology Molecular BiophysicsHumboldt University of Berlin10115 BerlinGermany

Protein folding,stability,and function are usually in-fluenced by *** free energy plays a fundamental role in analysis of such pH-dependent ***-trostatics-based theoretical framework using dielectric solvent continuum model and solving Poisson-boltzm-ann equation numerically has been shown to be very successful in understanding the pH-dependent ***,in this approach the exact computation of pH-dependent free energy becomes impractical for proteins possessing more than several tens of ioni-zable sites(e.g.>30),because exact evaluation of the partition function requires a summation over a vast number of possible protonation *** we present a method which computes the free energy us-ing the average energy and the protonation probabili-ties of ionizable sites obtained by the well-established Monte Carlo sampling *** key feature is to calculate the entropy by using the protonation *** used this method to examine a well-studied protein(lysozyme)and produced results which agree very well with the exact *** to the optimum pH of maximal stability of proteins and pro-tein-DNA interactions have also resulted in good agreement with experimental *** examples recommend our method for application to the elucidation of the pH-dependent properties of proteins.

关键词： protein protonation protein electrostatics pH-dependent free energy Poisson-boltzmann equation Monte Carlo simulation

Dynamic Modeling, Testing, and Stability Analysis of an Ornithoptic blimp

在线全文

学校读者我要写书评

暂无评论

Journal of bionic Engineering 2011年第4期8卷 375-386页

作者： John Dietl Thomas herrmann Gregory reich Ephrahim Garcia Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca New York USA Air Force research Laboratory Wright-Patterson AFB OH 45433-7542 USA

In order to study omithopter flight and to improve a dynamic model of flapping propulsion, a series 0f tests are conducted on a flapping-wing blimp. The blimp is designed and constructed from mylar plastic and balsa wood as a test platform for aerodynamics and flight dynamics. The blimp, 2.3 meters long and 420 gram mass, is propelled by its flapping wings. Due to buoyancy the wings have no lift requirement so that the distinction between lift and propulsion can be analyzed in a flight platform at low flight speeds. The blimp is tested using a Vicon motion tracking system and various initial conditions are tested including accelerating flight from standstill, decelerating from an initial speed higher than its steady state, and from its steady-state speed but disturbed in pitch angle. Test results are used to estimate parameters in a coupled quasi-steady aerodynamics/Newtonian flight dynamics model. This model is then analyzed using Floquet theory to determine local dynamic modes and stability. It is concluded that the dynamic model adequately describes the vehicle＇s nonlinear behavior near the steady-state velocity and that the vehicle＇s linearized modes are akin to those of a fixed-wing aircraft.

关键词： omithopter blimp flight dynamics stability analysis

Construct and correlates of basic motor competencies in primary school-aged children

维普期刊数据库评论

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 Sport and Health Science 2019年第1期8卷 63-70页

作者： Christian herrmann Christopher Heim Harald Seelig Department of Sport Exercise and Health University of Basel Department of Psychology and Sports Sciences University of Frankfurt

background: A central aim of physical education is the promotion of basic motor competencies(in German: Motorische basiskompetenzen;MObAK), which are prerequisites for children's active participation in sports culture. This article introduces the MObAK-1 test instrument for 6-to 8-year-old children and determines the construct validity of this test instrument. In addition, the relationship between MObAK and motor ability(i.e., strength) as well as body mass index(bMI), sex, and age is ***: We analyzed data of 923 first and second graders(422 girls, 501 boys, age = 6.80 ±0.44 years). The children's basic motor competencies were assessed by the MObAK-1 test instrument. besides analyses of frequency, correlation, and variance, 3 confirmatory factor analyses with covariates were ***: We found 2 MObAK factors consisting of 4 items each. The first factor, locomotion, included the items balancing, rolling, jumping, and side stepping; the second factor, object control, included the items throwing, catching, bouncing, and dribbling. The motor ability strength had a significant influence on the factors locomotion(b = 0.60) and object control(b = 0.50). Older pupils achieved better results than younger pupils on object control(b = 0.29). boys performed better on object control(b = -0.44), whereas girls achieved better results in locomotion(b = 0.07).Pupils with a high bMI achieved lower performance only on the factor locomotion(b =-0.28).Conclusion: The MObAK-1 test instrument developed for this study meets psychometric validity demands and is suitable to evaluate effects of sports and physical education.

关键词： bMI Factorial validity Gross motor skills Locomotion Measurement Object control Physical education Strength

Identifying migrant remains in South Texas:policy and practice

在线全文

学校读者我要写书评

暂无评论

Forensic Sciences research 2019年第1期4卷 60-68页

作者： M.Katherine Spradley Nicholas P.herrmann Courtney b.Siegert Chloe P.McDaneld Department of Anthropology Texas State UniversitySan Marcos(TX)USA

In 2012, Texas surpassed Arizona in migrant deaths. The majority of deaths occurred in the rio Grande Valley, specifically in brooks County, Texas. brooks County is one of the poorest in the state and was overwhelmed with deaths, without appropriate resources to follow the state laws pertaining to the investigation of unidentified human remains. Until 2013, most remains that were not immediately identified were buried without collecting DNA samples and the location of burials was not recorded. Our paper outlines the difficulties searching for these burials, the struggles of the families of the missing, and the collaborative approaches to facilitating identifications in South Texas. Community outreach combined with geophysical surveys guide which cemeteries are in need of exhumations. Once ceme-teries are surveyed, archaeological methods are employed to exhume remains and docu-ment burials. remains are taken to the Forensic Anthropology Center at Texas State for processing, analysis, and identification efforts. Undergraduate and graduate students clean remains and wash clothing and personal *** skeletal analysis, all information regarding the remains, including photographs of per-sonal effects, are uploaded to the National Missing and Unidentified Persons System (NamUs) and a DNA sample is submitted to the University of North Texas for inclusion in the Combined DNA Index System (CODIS) DNA database. However, CODIS lacks DNA family reference samples from many families of the missing due to families living outside the US or because they do not feel comfortable providing a DNA sample in the presence of law enforcement. Therefore, it is necessary to work with non-governmental organizations who specialize in collecting missing persons reports and DNA samples from the families of the missing. Working collaboratively with multiple agencies, identification of migrant remains is possible.

关键词： Forensic anthropology migrant migration positive identification geophys-ical survey