Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Measurement of charged-particle multiplicities in gluon and quark jets in p(p)over-bar collisions at root s=1.8 TeV

We report the first largely model independent measurement of charged particle multiplicities in quark and gluon jets, N-q and N-g, produced at the Fermilab Tevatron in p (p) over bar collisions with a center-of-mass energy of 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies of 41 and 53 GeV by counting charged particle tracks in cones with opening angles of θ(c)=0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q=E-jetθ(c) varies in the range from 12 to 25 GeV. At Q=19.2 GeV, the ratio of multiplicities r=N-g/N-q is found to be 1.64± 0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with resummed perturbative QCD calculations

Measurement of the B- and (B)over-bar(0) meson lifetimes using semileptonic decays

The lifetimes of the B- and (B) over bar(0) mesons an measured using the partially reconstructed semileptonic decays (B) over bar --> Dl(-)<(nu)over bar>X, where D is either a D-0 or D*+ meson. The data were collected by the CDF detector at the Fermilab Tevatron collider during 1992-1995 and correspond to about 110 pb(-1) of (p) over bar p collisions at root s = 1.8 TeV. We measure decay lengths and extract the lifetimes to be tau(B-) = 1.637 +/- 0.058(-0.043)(+0.045) ps and tau((B) over bar(0)) = 1.474 +/- 0.039(-0.051)(+0.052) ps, and the ratio of the lifetimes to be tau(B-)/tau((B) over bar(0)) = 1.110 +/- 0.056(+0.030)(+0.033), where the first uncertainties are statistical and the second are systematic. [S0556-2821(98)08419-7]

Search for the flavor-changing neutral current decay D-0 ->mu(+)mu(-) in p(p)over-bar collisions at root s=1.96 TeV

We report on a search for the flavor-changing neutral current decay D^0\to\mu^+\mu^- in p\bar{p} collisions at \sqrt{s}=1.96 TeV using 65\ipb of data collected by the CDF II experiment at the Fermilab Tevatron Collider. A displaced-track trigger selects long-lived D^0 candidates in the D^0\to\mu^+\mu^- search channel, the kinematically similar D^0\to\pi^+\pi^- channel used for normalization, the Cabbibo-favored D^0\to K^+\pi^- channel used to optimize the selection criteria in an unbiased manner, and their charge conjugates. Finding no signal events in the D^0\to\mu^+\mu^- search window, we set an upper limit on the branching fraction {\cal B}(D^0\to\mu^+\mu^-)\leq 2.5E-6 (3.3E-6) at the 90% (95%) confidence level.Comment: 14 pages, 2 postscript figures, RevTeX, submitted to Phys. Rev. D rapid com

A global approach for natural history museum collections

International audienceIntegration of the world’s natural history collections can provide a resource for decision-maker