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Search Results: 1 - 10 of 55819 matches for " Wu Di "
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UWB-Based Localization in Wireless Sensor Networks  [PDF]
Di WU, Lichun BAO, Renfa LI
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.25046
Abstract: Localization has many important applications in wireless sensor networks, such as object searching and tracking, remote navigation, location based routing etc. The distance measurements have been based on a variety of technologies, such as acoustic, infrared, and UWB (ultra-wide band) media for localization pur-poses. In this paper, we propose UWB-based communication protocols for distance estimation and location calculation, namely a new UWB coding method, called U-BOTH (UWB based on Orthogonal Variable Spreading Factor and Time Hopping), an ALOHA-type channel access method and a message exchange protocol to collect location information. U-BOTH is based on IEEE 802.15.4a that was designed for WPANs (wireless personal area networks) using the UWB technology. We place our system in coal mine environ-ments, and derive the corresponding UWB path loss model in order to apply the maximum likelihood esti-mation (MLE) method to compute the distances to the reference sensors using the RSSI information, and to estimate the coordinate of the moving sensor using least squares (LS) method. The performance of the sys-tem is validated using theoretic analysis and simulations. Results show that U-BOTH transmission technique can effectively reduce the bit error rate under the path loss model, and the corresponding ranging and local-ization algorithms can accurately compute moving object locations in coal mine environments.
Research on Policy Regulation and Realization Path of Ningxia’s Construction of All-for-One Tourism Demonstration Zone  [PDF]
Di Tian, Meifan Wu, Mu Zhang
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.99097
Abstract: Located at the key spot of the construction of the Silk Road Economic Belt, Ningxia Hui Autonomous Region has abundant natural and cultural resources with relatively small area and small population, and tourism here plays an important role in local economic development. As China vigorously promoted the construction of tourism throughout the nation, the local government actively responded to the call of the state and successfully became the second state-level all-for-one tourism demonstration zone on a province basis, and finally achieved some decent results. In order to summarize the experience on tourism policy of Ningxia, by introducing Nvivo implementation analysis tool, this paper analyzes and summarizes a series of policy documents for the construction of demonstration zone in Ningxia. According to the specific requirements in the Guideline on the Development of All-for-One Tourism released by the State Council, the article encodes the specific policy measures for Ningxia’s development and establishes a node system, pointing out that Ningxia’s policy measures are consistent with the ones formulated at the national level. On this basis, taking the Xixia District of Yinchuan in Ningxia Hui Autonomous Region as an example, the paper analyzes its specific measures and effects of developing regional tourism, and discusses the policy regulation and implementation path that means taking planning and guidance seriously, emphasizing concrete implementation, promoting industrial integration, and paying close attention to tourism supervision.
Liquid exploding emission during boiling nucleation in capillary tubes
Di Wu,XiaoFeng Peng
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3281-6
Abstract: A series of experiments was conducted to visually observe boiling nucleation phenomena in micro capillary tubes employing a high speed CCD. At a higher heat flux the liquid in capillary tubes was emitted instantaneously rather than generating nucleate boiling, which is referred as liquid exploding emission in this paper. Both critical emission heat flux and temperature corresponding to this phenomenon were measured for tubes with different heating lengths and arrangements of two end sections. Boiling nucleation and liquid film evaporation played critical roles in different stages during exploding emission. Dimensionless critical emission volumetric heat was introduced to describe the conditions of the emission instead of heat flux, and theoretical discussions were conducted to explore the influences of thermal properties and geometrical configuration, particularly heating length and asymmetry of two end sections of tubes.
5,8-Dibromo-14,17-difluoro-2,11-dithia[3.3]paracyclophane
Xiaowei Hao,Di Wu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810028904
Abstract: The title compound, C16H12Br2F2S2 [systematic name: 12,15-dibromo-52,55-difluoro-2,7-dithia-1,5(1,4)-dibenzenaoctaphane], has two approximately parallel benzene rings with a dihedral angle of 1.53 (15)° between them and with a centroid–centroid distance of 3.3066 (18) . In the crystal structure, molecules are stacked along the a axis through an intermolecular π–π interaction with a centroid–centroid distance of 3.7803 (18) . Molecules are also connected by a C—H...S interaction, forming a chain along the b axis.
5,8-Bis(3-hydroxy-3-methylbut-1-yn-1-yl)-2,11-dithia[3.3]paracyclophane
Di Wu,Jie Huang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811048446
Abstract: In the crystal structure of the title compound [systematic name: 2,2′-dimethyl-4,4′-(3,10-dithiatricyclo[10.2.2.25,8]octadeca-1(14),5,7,12,15,17-hexaen-6,17-diyl)dibut-3-yn-2-ol], C26H28O2S2, molecules are linked by O—H...O hydrogen bonds, forming a tubular chain which runs parallel to the b axis. The tubular structure is reinforced by π–π stacking interactions [centroid–centroid distance = 3.6332(16 ].
The EML4-ALK Fusion Gene in NSCLC and the Clinical Progress
Di WU,Hong YU
Chinese Journal of Lung Cancer , 2011, DOI: 10.3779/j.issn.1009-3419.2011.05.10
Abstract:
Mass hierarchy and the spectrum of scalars
Dan-di Wu
Physics , 1995,
Abstract: We use the natural $SU(3)\times U(1)$ global symmetry of the gauge-fermion interaction sector of the standard model to discuss the fermion mass hierarchy problem. The $SU(3)$ sixtet and triplet Higgs are introduced. The Yukawa sector is partially symmetric. The smaller the symmetry of a Yukawa term, the smaller its coupling constant. The mass hierarchy is a combined effect of smaller coupling constants and smaller VEVs. There is a bunch of pseudo-goldstone bosons which obtains their masses mainly from the small explicit breaking terms in the Higgs potential.
FCNC, CP violation, and impure Majorana neutrinos
Dan-Di Wu
Physics , 1996, DOI: 10.1103/PhysRevD.56.7472
Abstract: The tree level diagonalization of a neutrino mass matrix with both Majorana and Dirac masses is discussed in a general context. Flavor changing neutral currents in such models are inevitable. Rephasing invariant quantities characterizing CP violation in FCNC Fermion-Higgs interactions are identified. At the one loop level, the mass eigenstates become an impure Majorana type. The possibility of a significant change in the mass spectrum for the left-handed neutrinos is explored, with an example of two species of neutrinos. Neutrino oscillations with impure Majorana neutrinos are also discussed.
Small Elements in Fermion Mass Matrices and Anomalous Dipole Moments
Dan-di Wu
Physics , 1995, DOI: 10.1016/0370-2693(96)00121-9
Abstract: Assuming the small entries in the mass matrices are produced by fermion-scalar loops, we calculate the anomalous dipole moments of the leptons and quarks. The top quark appears in all the loops as the mass seed. When comparing the results with experimental data, including electric and magnetic dipole moments, and radiative transition rates, we obtain the mass limits which are typically larger than .1 TeV for the relevant neutral scalars, and 70 TeV for the relevant lepto-quarks. We then discuss the $P-\bar P$ mixing with a toy model. Rates of the known mixings require the masses of some neutral scalars to be large.
Cascade Global Symmetry and Quark Mass Hierarchy
Dan-di Wu
Physics , 1995,
Abstract: Cascade global symmetry and multi-vacuum expectation values are combined to produce an {\bf initial} texture of the quark mass matrices. Required corrections to the initial texture zeros ({\bf ITZ)} are all at the order of $10^{-3}m_t$ or less. The possibility of {\bf radiative corrections} as the source of the complete mass matrices is briefly discussed.
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