Remote monitoring of human hand motion using induced electrostatic signals

In this paper, the electrostatic detection equation of moving hand is proposed based on Gauss’ Law and electric field superposition theorem, and experimental results match the theoretical calculation well, which confirms that we can monitor hand motion under non-contact condition effectively. Then we develop an effective non-contact, passive and low cost technique using induced electrostatic signals measurement for determination of the velocity and direction of human hand motion based on the variation tendency in the electric field strength between moving hand and electrodes, which doesn’t require complex data processing even in an open unshielded environment close to sources of power line interference and resistance noise generated by computer and electric iron respectively. Experimental results confirm that hand gesture can be recognized by non-contact electrostatic detection by adopting multiple electrodes array.     

基于MYO和Android的肌电假肢手控制系统设计与实现*

针对目前假肢手控制系统成本高、操作不灵活、实用性差等问题,设计了一种基于MYO和Android的肌电假肢手控制系统。在Android平台上,开发了一款智能终端应用,实现了对MYO臂环采集的表面肌电信号进行数据处理和模式识别,并实时控制假肢手完成五种模式。实验结果表明,系统的在线识别率可达98.2%,并可在300ms左右完成一次识别过程,满足了假肢手控制的精度和实时性要求。该系统设计成本低廉、方便携带且易于扩展,很好地满足了截肢患者对假肢手控制的需求。     

Atmosphere temperature monitoring by cosmic rays

The complexity of obtaining continuous series of precise, frequent, and reliable data on meteorological parameters makes it difficult to use the ground-based records on the muon component of cosmic rays. This work proposes to determine the temperature conditions of the atmosphere directly from the solution of a set of equations for cosmic ray variations. We demonstrate the possibility of, on the one hand, accounting for the temperature effect of the muon component without the use of aerological data and, on the other hand, diagnostics of the temperature conditions of the atmosphere from cosmic ray monitoring.     

Analysis and synthesis of the three-dimensional movements of the head, face, and hand of a speaker using cued speech

In this paper we present efforts for characterizing the three dimensional (3-D) movements of the right hand and the face of a French female speaker during the audiovisual production of cued speech. The 3-D trajectories of 50 hand and 63 facial flesh points during the production of 238 utterances were analyzed. These utterances were carefully designed to cover all possible diphones of the French language. Linear and nonlinear statistical models of the articulations and the postures of the hand and the face have been developed using separate and joint corpora. Automatic recognition of hand and face postures at targets was performed to verify a posteriori that key hand movements and postures imposed by cued speech had been well realized by the subject. Recognition results were further exploited in order to study the phonetic structure of cued speech, notably the phasing relations between hand gestures and sound production. The hand and face gestural scores are studied in reference with the acoustic segmentation. A first implementation of a concatenative audiovisual text-to-cued speech synthesis system is finally described that employs this unique and extensive data on cued speech in action.     

Interpolating between soft and hard dynamics in deep inelastic scattering

An explicit model for the proton structure function is suggested, interpolating between low- vector meson dominance and Regge behavior, on the one hand, and the high- solution of the Gribov-Lipatov-Altarelli-Parisi evolution equation, on the other hand. The model is fitted to the experimental data in a wide range of the kinematical variables with emphasis on the low-x HERA data. The boundaries, transition region and interface between various regimes are quantified. Received: 9 March 1998 / Revised version: 26 May 1998 / Published online: 5 October 1998     

Passive broadband acoustic thermometry

The 1D internal (core) temperature profiles for the model object (plasticine) and the human hand are reconstructed using the passive acoustothermometric broadband probing data. Thermal acoustic radiation is detected by a broadband (0.8–3.5 MHz) acoustic radiometer. The temperature distribution is reconstructed using a priori information corresponding to the experimental conditions. The temperature distribution for the heated model object is assumed to be monotonic. For the hand, we assume that the temperature distribution satisfies the heat-conduction equation taking into account the blood flow. The average error of reconstruction determined for plasticine from the results of independent temperature measurements is 0.6 K for a measuring time of 25 s. The reconstructed value of the core temperature of the hand (36°C) generally corresponds to physiological data. The obtained results make it possible to use passive broadband acoustic probing for measuring the core temperatures in medical procedures associated with heating of human organism tissues.     

Simulation of coherent structures in nonlinear Schrödinger-type equations

This paper presents some numerical methods to simulate the evolution of coherent structures with small fluctuations, that appear as typical solutions of a class of nonintegrable nonlinear Schrödinger equations. The construction of the methods is particularly focused on two points: on one hand, the generation of the ground state profiles, to be used in the initial data of the simulations, combines a suitable spatial discretization with the resolution of a discrete variational problem. On the other hand, the approximation to leading parameters of these structures is controlled by the time integration. We compare different methods when simulating the evolution of initial ground state profiles and some initial data perturbed from them.     

大数据服务深度需求与SOA协作集成的异构系统融合机制

大数据服务需求的认知深度和服务架构的融合度直接影响多业务大数据应用的资源管理和服务质量,本文提出了一种基于大数据服务深度需求分析和面向服务的协作集成架构的异构系统融合机制。该机制,一方面,在分析大数据源多样化、差异化大数据组织形式及其存储方式,结合不同类型用户的需求差异化特征,建立了大数据服务需求分析模型。另一方面,对于多态异构的移动互联网大数据服务,经过结构化和开放性处理后,给出大数据通信和服务调用描述定义,提出了SOA协作集成的异构系统融合架构。仿真实验结果表明,所提出的算法在大数据服务响应成功率、执行时间和代价比等方面具有明显优势。     

基于无线数传技术的智能农机载高光谱采集系统的研究

为了解决精确农业中高密度的、全面的农田信息采集、数据无线传输和实时处理分析的需要,文章中所讨论的系统利用计算机技术和无线数传技术对GPS, GIS和RS进行有机集成,一方面系统通过AT89lv52单片机,使差分GPS和高光谱仪有机集成,能为采集到的光谱数据提供高精度的空间位置属性,实现光谱数据采集、定位一体化;另一方面利用nRF905数传模块实现数据采集控制系统与微机的数据信息和控制信息互传;同时利用Visual Basic和Map Objects控件集成GIS,实现了具有空间属性的光谱数据可视化管理和分析处理,实时地显示动点轨迹、各图层对应点属性,计算作物微分光谱和植被指数NDVI等功能,为专家系统和决策支持系统提供充足的信息。     

DPS在物理实验数据处理中的应用

本文以刚体转动定律研究实验为例,介绍DPS软件在物理实验中进行数据处理的方法和过程。用DPS处理物理实验数据能有效避免手工处理所带来的误差,而且方法简单,适合在实验教学中使用。     

基于GPS的智能农机载高光谱采集系统的初步研究

为了解决精确农业中高密度的和全面的农田信息采集的需要,本系统利用visual basic和map objects对GPS, GIS和RS进行有机集成, 一方面系统通过集成GPS, 能为采集到的光谱数据提供高精度的空间位置属性,实现光谱数据采集、定位和存储一体化; 另一方面通过集成GIS,实现了具有空间属性的光谱数据可视化管理和分析处理, 实时地显示动点轨迹和各图层对应点属性,计算作物微分光谱和植被指数NDVI等功能, 为专家系统和决策支持系统提供充足的信息。     

Generalised parton distributions at small <Emphasis Type="Italic">x</Emphasis>

We justify the practical use of the Shuvaev integral transform approach to calculate the skewed distributions, needed to describe diffractive processes, directly from the conventional diagonal global parton distributions. We address doubts which have been raised about this procedure. We emphasise that the approach, on the one hand, satisfies all theoretical requirements, and, on the other hand, is consistent with DVCS data at NLO. We construct an easily accessible package for the computation of these skewed distributions.     

On the Mott-Littleton dielectric theory for alkali halides

It has been demonstrated that the Mott-Littleton theory of dielectric constant is consistent with the recent experimental data on the pressure dependence of dielectric constant of alkali halides. On the other hand, the Clausius-Mossotti and Drude models yield large deviations from the observed data.     

A Study on the Correlation Between Poles and Cuts in ππ Scattering

In this paper we propose a dispersive method to describe two-body scattering with unitarity imposed. This approach is applied to elastic ππ scattering. The amplitudes keep single-channel unitarity and describe the experimental data well, and the low-energy amplitudes are consistent with that of chiral perturbation theory. The pole locations of the σ, f0(980), ρ(770) and f2(1270) and their couplings to ππ are obtained. A virtual state appearing in the isospin-two S-wave is confirmed. The correlations between the left(and right) hand cut and the poles are discussed. Our results show that the poles are more sensitive to the right hand cut rather than the left hand cut. The proposed method could be used to study other two-body scattering processes.     

Dependence of Forbush-decrease magnitudes on parameters of solar eruptions

By data of the 23^rd solar cycle, it is shown that close statistical relations exist between quantitative parameters of dimmings and arcades caused by solar coronal mass ejections (CMEs), on the one hand, and magnitudes of non-recurrent Forbush-decreases of the galactic cosmic ray flux, as well as the propagation time of disturbances from the Sun to the Earth, on the other hand. Parameters of dimmings and arcades, in particular their summarized magnetic flux of the prolonged field at the photospheric level, were calculated by data of the EUV SOHO/EIT telescope in the 195 Å Received results mean that the scale, characteristics, and propagation time of interplanetary disturbances to the Earth are determined to a large degree by measurable parameters of solar eruptions and may be estimated in advance by observations of dimmings and arcades in the EUV range.     

Vortex shedding process investigation downstream a surface-mounted block

The laminar flow around a surface-mounted block is investigated by visualizations and PIV measurements. Flow topology and, especially, the vortex shedding dynamics are emphasized. The existence of two vortex shedding processes is highlighted by particles visualizations and instantaneous velocity fields analyses. On one hand, a dominant swirling mechanism with vortex matching process and a symmetrical topology sets up and, on the other hand, a non periodical evolution with a dissymmetric topology exist. In order to inquire about those processes, double velocity correlation functions are calculated and from those new data the space and time evolutions of the vortices are detailed.     

Semiclassical approaches to proton emission in intermediate-energy heavy-ion reactions

Semiclassical approaches are proposed for studying the transition between one- and two-body processes in intermediate-energy heavy-ion collisions. The Landau-Vlasov equation is used as a transport equation for nucleons in the nuclear matter. We apply our formalism to the fast proton ejection. On the one hand, the effects of the nucleon-nucleon collisions are studied for particles which travel through the nucleus cores. On the other hand, inertial emission turns out to be an important proton-emission mechanism. Our results conflict with the interpretation of the proton spectra in terms of moving sources. Reasonable agreement with the experimental data are found without reference to any thermal equilibrium.     

Origin9.0软件在微波技术实验中的应用探讨

以近代物理实验中的微波技术实验为例,详细介绍了用Origin9.0软件进行绘图和非线性拟合处理实验数据的方法,对实验测定的数据进行绘图、计算、拟合。该软件的应用,能够有效避免人工计算处理所带来的误差,大大简化实验数据处理过程,获得人工绘图难以获得的更多的信息量,且运用软件结果高效准确。