检索结果-南通市图书馆

Rolling in Nature and Robotics: A Review

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2006年第4期3卷 195-208页

作者： Rhodri H.Armour julian F.V.Vincent Centre for Biomimetic and Natural Technologies Department of Mechanical Engineering University of Bath Bath BA2 7AY UK

This paper presents a review of recent rolling robots including Rollo from Helsinki University of Technology, Spherical Mobile Robot from the Politecnico of Bad, Sphericle from the University of Pisa, Spberobot from Michigan State University, August from Azad University of Qazvin and the University of Tehran, Deformable Robot from Ritsumeijan University, Kickbot from the Massachusetts Institute of Technology, Gravitational Wheeled Robot from Kinki University, Gyrover from Carnegie Mellon University, Roball from the Université de Sherbrooke, and Rotundus from the Angstroem Space Technology Center. Seven rolling robot design principles are presented and discussed （Sprung central member, Car driven, Mobile masses, Hemispherical wheels, Gyroscopic stabilisation, Ballast mass - fixed axis, and Ballast mass - moving axis）. Robots based on each of the design principles are shown and the performances of the robots are tabulated. An attempt is made to grade the design principles based on their suitability for movement over an unknown and varied but relatively smooth terrain. The result of this comparison suggests that a rolling robot based on a mobile masses principle would be best suited to this specific application. Some wonderful rolling organisms are introduced and defined as ＂active＂ or ＂passive＂ depending on whether they generate their own rolling motion or external forces cause their rolling.

关键词： Rolling robot tumbleweed wheel ballast Gryoscope

Visible Light Communication for Vehicular Applications: A Novel Architecture with Proof-of-Concept Prototype

在线全文

学校读者我要写书评

暂无评论

China Communications 2023年第6期20卷 249-259页

作者： Yang Yang Fan Zhang Zhiming Zeng julian Cheng Caili Guo School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China China Telecom Co. LtdBeijing 100007China School of Engineering the University of British ColumbiaKelownaBC V1V 1V7Canada

When there is an increasing interest in visible light communication(VLC), outdoor vehicle VLC has emerged as a promising candidate technology for future intelligent transportation systems. However, in VLC based vehicular applications, several challenges impede successful commercial application of VLC based products. This article first provides a thorough overview of the existing challenges. To overcome these challenges, we propose a novel architecture with tracking and environment sensing ability for practical vehicular applications. Moreover, a proof-ofconcept prototype is implemented to validate the feasibility of the proposed system. Experimental and simulation results show that the proposed VLC system can provide reliable communications with a bit-error rate less than 10-4for vehicles under strong interference lights. Finally, based on the evaluations, we propose some key design issues for future studies in this research area.

关键词： environment sensing vehicular communications visible light communications

Dimensional characterization of cadmium selenide nanocrystals via indirect Fourier transform evaluation of small-angle X-ray scattering data

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第11期12卷 2849-2857页

作者： julian Cedric Porsiel Bilal Temel Alfred Schirmacher Egbert Buhr Georg Garnweitner Institute for Particle Technology(iPAT) Technische Universität BraunschweigBraunschweig38104Germany Physikalisch-Technische Bundesanstalt Braunschweig Braunschweig38116Germany Laboratory for Emerging Nanometrology Technische Universität BraunschweigBraunschweig38106Germany

The correlation of single-particle imaging and absorption spectroscopy made the development of sizing curves possible and enabled rapid size determination of semiconductor nanocrystals based solely on optical *** increasing demand and production of such materials has resulted in a question of comparability between existing models and adequate volume-weighted size-determining measurement ***-angle X-ray scattering(SAXS)is a well-established method for obtaining nanostructural information from particle systems while operating sample quantities up to a commercial scale with a large amount of statistically based *** work utilizes laboratory SAXS to characterize cadmium selenide nanocrystals with band edge energies between 1.97 and 3.08 *** evaluation of the scattering patterns is based on an indirect Fourier transformation(IFT),while dimensional parameters are derived from the model-free pair distance distribution functions(Dmode and Dg),as well as the modeled volume(Dv)and number(Dn)-weighted size-density *** find that comparable data from D̅n agree well with existing X-ray diffraction(XRD)and with transmission electron microscopy(TEM)results described in literature;this qualifies SAXS as an equivalent integral characterization *** based on an estimate,the radius of gyration yields equivalent accurate ***,corresponding volume-weighted data are shown that can be useful when transferring information to other *** parametrization represents the largest estimated size of the sample and implies that particles interact and deviate from the spherical morphology,whereas Dv demonstrates results not considering such effects.A full set of the parameters discussed quantifies the quality of a sample.

关键词： quantum dots small angle scattering indirect Fourier transform transmission electron microscopy optical absorption spectroscopy particle size distribution

Seasonal dependency of controlling factors on the phytoplankton production in Taihu Lake, China

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 Environmental Sciences 2019年第2期31卷 278-288页

作者： Qiaohua Zhao Jing Wang Jianjian Wang julian X.L.Wang College of Hydrometeorology Nanjing University of Information Science and Technology Air Resources Laboratory National Oceanic and Atmospheric AdministrationCollege Park

In this study, 44 profiles of gross primary productivity(GPP) and sunlight, along with water temperature, Chlorophyll-a(Chla) and nutrients, were observed in Meiliang Bay of Taihu Lake, China, in the spring, summer, and fall seasons. Effects of water temperature, light,and nutrient concentration were examined in relation to the GPP-unit-Chla(GPP of algae per Chla). The results showed that the optimum temperature for the GPP of phytoplankton was 27.9°C, the optimal PNA-unit-Chla(photon number absorbed by phytoplankton per Chla) was 0.25(mol), and the HSCN-unit-Chla and HSCP-unit-Chla(half-saturation constants of nitrogen and phosphorus of algae per Chla) were 0.005(mg/L) and 0.0004(mg/L), respectively. The seasonal dependency of the effect of different factors on the GPP was analyzed. Compared with temperature and nutrients, light was found to be the most important factor affecting the GPP during the three seasons. The effect of temperature and nutrients on the GPP of phytoplankton has obvious seasonal change. In spring, temperature was the secondary factor affecting the GPP of phytoplankton, and the effect of nutrients may be negligible in the eutrophic lake on account of temperature limit, which showed that the GPP of algae was only affected by the physical process. In summer and fall, temperature didn't affect the GPP of algae, and the presence of nutrients was the secondary factor affecting the GPP of phytoplankton. From summer to fall, effect of phosphorus was weakened and effect of nitrogen was enhanced.

关键词： Temperature limited effect Gross primary productivity Eutrophication Light limit Optimum temperature Half-saturation constants

Towards more-than-human heritage:arboreal habitats as a challenge for heritage preservation

在线全文

学校读者我要写书评

暂无评论

Built Heritage 2020年第1期4卷 20-36页

作者： Stanislav Roudavski julian Rutten Faculty of Architecture Building and PlanningThe University of MelbourneMelbourneAustralia Faculty of Health Arts and DesignThe University of SwinburneMelbourneAustralia

Trees belong to humanity’s heritage,but they are more than *** loss,through catastrophic fires or under business-as-usual,is devastating to many forms of *** by this fact,we begin with an assertion that heritage can have an active role in the design of future *** from within the field of architecture,this article focuses on structures that house *** features of trees and artificial replacement habitats for arboreal wildlife serve as concrete *** of such habitats need to reflect behaviours,traditions and cultures of birds,bats,and other *** narrative highlights the nonhuman aspect of heritage,seeking to understand how nonhuman stakeholders can act as users and consumers of heritage and not only as its *** working definition states that more-than-human heritage encompasses tangible and intangible outcomes of historical processes that are of value to human as well as nonhuman *** this basis,the article asks how the established notions of heritage can extend to include nonhuman concerns,artefacts,behaviours and *** a possible answer to this question,the hypothesis tested here is that digital information can(1)contribute to the preservation of more-than-human heritage;and(2)illuminate its characteristics for future study and *** article assesses the potential of three imaging technologies and considers the resulting data within the conceptual framework of more-than-human heritage,illuminating some of its concrete aspects and challenges.

关键词： Digital heritage Cultural heritage Natural heritage Biological conservation More-than-human heritage More-than-human design Large old trees Arboreal habitat

Hierarchical Mean-Field Type Control of Price Dynamics for Electricity in Smart Grid

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 Systems Science & Complexity 2022年第1期35卷 1-17页

作者： FRIHI Zahrate El Oula CHOUTRI Salah Eddine BARREIRO-GOMEZ julian TEMBINE Hamidou Laboratory of Probability and Statistics(La PS) Department of MathematicsBadji-Mokhtar UniversityB.P.12Annaba 23000Algeria. NYUAD Research Institute New York University Abu DhabiUAE Learning&Game Theory Laboratory New York University Abu DhabiSaadiyat Campus PO Box 129188UAE

This paper solves a mean-field type hierarchical optimal control problem in electricity *** authors consider n-1 prosumers and one *** ith prosumer,for 1 详细信息

This paper solves a mean-field type hierarchical optimal control problem in electricity *** authors consider n-1 prosumers and one *** ith prosumer,for 1

关键词： Electricity price dynamics hierarchical control mean-field-type control smart grids

Obstructive uropathy-acute and chronic medical management

在线全文

学校读者我要写书评

暂无评论

World Journal of Nephrology 2023年第1期12卷 1-9页

作者： julian Yaxley William Yaxley Division of Medicine Queensland HealthBrisbane 4001QLDAustralia School of Medicine and Dentistry Griffith UniversitySouthport 4215Australia Department of Urology Queen Elizabeth II Jubilee HospitalCoopers Plains4108Australia

Obstructive uropathy is an important cause of acute and chronic kidney *** of the urinary tract is an essential aspect of *** cause and aetiology of obstruction typically determine the surgical *** relief of obstruction is frequently complicated by fluid and electrolyte *** therapeutic interventions for acute or chronic renal failure also apply for cases of obstructive *** narrative review summarises the early and long-term medical management of obstructive uropathy.

关键词： Obstructive uropathy Nephrology Urology Post-obstructive Diuresis

Quantifyingα-diversity as a continuous function of location——a case study of a temperate forest

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

林业研究:英文版 2023年第6期34卷 1683-1691页

作者： Peijian Shi Brady K.Quinn Long Chen Jie Gao julian Schrader Bamboo Research Institute College of Ecology and EnvironmentNanjing Forestry University159 Longpan RoadNanjing 210037People’s Republic of China Tropical Silviculture and Forest Ecology University of GottingenBusgenweg 137077 GottingenGermany St.Andrews Biological Station Fisheries and Oceans Canada125 Marine Science DriveSt.AndrewsNB E5B 0E4Canada College of Life Science Xinjiang Normal University102 Xinyi RoadUrumqi 830054People’s Republic of China School of Natural Sciences Macquarie UniversitySydneyNSW 2109Australia Biodiversity Macroecology&BiogeographyUniversity of GottingenBusgenweg 137077 GottingenGermany

α-diversity describes species diversity at local *** Simpson’s and Shannon-Wiener indices are widely used to characterizeα-diversity based on species abundances within a fixed study site(e.g.,a quadrat or plot).Although such indices provide overall diversity estimates that can be analyzed,their values are not spatially continuous nor applicable in theory to any point within the study region,and thus they cannot be treated as spatial covariates for analyses of other ***,we extended the Simpson’s and Shannon-Wiener indices to create point estimates ofα-diversity for any location based on spatially explicit species occurrences within different bandwidths(i.e.,radii,with the location of interest as the center).For an arbitrary point in the study region,species occurrences within the circle plotting the bandwidth were weighted according to their distance from the center using a tri-cube kernel function,with occurrences closer to the center having greater weight than more distant *** novel kernel-basedα-diversity indices were tested using a tree dataset from a 400 m×400 m study region comprising a 200 m×200 m core region surrounded by a 100-m width buffer *** newly extendedα-diversity indices did not disagree qualitatively with the traditional indices,and the former were slightly lower than the latter by<2%at medium and large band *** present work demonstrates the feasibility of using kernel-basedα-diversity indices to estimate diversity at any location in the study region and allows them to be used as quantifiable spatial covariates or predictors for other dependent variables of interest in future ecological *** continuousα-diversity indices are useful to compare and monitor species trends in space and time,which is valuable for conservation practitioners.

关键词： Distance-based weighting Diversity continuum Kernel function Shannon-Wiener index Simpson’s index Tri-cube kernel

荻草谷网蚜ABCG1基因的克隆及表达模式分析

在线全文

学校读者我要写书评

暂无评论

植物保护 2024年第1期50卷 256-263,285页

作者：于苗苗张思宇宋国锋陈巨莲解海翠范佳河北科技师范学院河北省作物逆境生物学重点实验室(筹)秦皇岛066600 中国农业科学院植物保护研究所植物病虫害综合治理全国重点实验室北京100193

荻草谷网蚜Sitobion miscanthi是严重威胁我国小麦生产安全的迁飞性害虫。蜕皮激素是参与蚜虫翅型分化调控的内激素,在有翅成蚜体内保持高滴度,且诱导后代产生更高比例的无翅蚜,其进出靶细胞需要经过细胞膜上特定蛋白的转运。ATP结合盒... 详细信息

荻草谷网蚜Sitobion miscanthi是严重威胁我国小麦生产安全的迁飞性害虫。蜕皮激素是参与蚜虫翅型分化调控的内激素,在有翅成蚜体内保持高滴度,且诱导后代产生更高比例的无翅蚜,其进出靶细胞需要经过细胞膜上特定蛋白的转运。ATP结合盒转运蛋白家族G亚家族(ATP-binding cassette transporter G, ABCG)中的ABCG1是通过跨膜转运昆虫类固醇、对蜕皮激素信号进行负调控的功能蛋白之一,在蚜虫中尚未见报道。本文克隆了荻草谷网蚜ABCG1(SmisABCG1)基因,并进行了序列比对、系统进化分析以及不同组织部位和发育时期表达模式分析。结果显示,SmisABCG1基因的开放阅读框全长为1 851 bp,编码616个氨基酸,含7个跨膜结构域,符合ABCG蛋白家族典型结构特性,基因登录ID:OP626323。昆虫间ABCG1较保守,该蛋白系统进化关系与各自物种间亲缘关系的远近保持一致。其中,SmisABCG1与来自豌豆蚜、禾谷缢管蚜、棉蚜、花生蚜和雪松长足大蚜等的ABCG1氨基酸序列高度一致(>87%),以上蚜虫聚为一支。与SmisABCG1亲缘关系最近的是豌豆蚜的ABCG1,其次是半翅目的褐飞虱、白背飞虱和灰飞虱,与膜翅目的新疆菜叶蜂、阿里山潜蝇茧蜂以及鞘翅目的赤拟谷盗、蜂箱小甲虫亲缘关系较远。该基因在伪胚胎和成蚜阶段高表达。包含伪胚胎的有翅、无翅成蚜整蚜SmisABCG1的转录水平无显著差异,但其在来自有翅成蚜的伪胚胎中的转录水平高于无翅成蚜伪胚胎,证实无翅成蚜自身的转录水平较高,而有翅成蚜较低。进一步分析显示这一差异主要是无翅蚜胸部显著高表达所导致。基于该蛋白对蜕皮激素负调控,与有翅成蚜转录水平低,但蜕皮激素水平更高相符合。

关键词：荻草谷网蚜 ABC转运蛋白蜕皮激素基因克隆表达谱