长三角地区区域统筹评价以及影响因素分析

区域经济统筹发展是区域经济增长的一种全新战略。通过对长三角地区的研究发现,长三角地区区域经济差异没有呈现收敛或发散规律,而是地区发展形势不断波动。区域差异与区域经济增长、产业结构之间存在着长期均衡关系,产业结构调整比经济增长在统筹区域发展中发挥着更加重要的作用。因此,在区域统筹发展中,要继续突出增长极的带动作用,同时保证社会公共服务均等化,实施协调区域关系,实行差异化的发展战略。     

Multi-dimensional scattering properties diagnosis system of scale aircraft model in an anechoic chamber

Aiming at the concept of ＂diagnosis＂, a simple and effective broadband radar cross section （RCS） measurement system is constructed, and some multi-dimensional scattering properties diagnosis techniques are presented based on the system. Firstly, a stepped-frequency signal is employed to achieve high range resolution, combining with a variety of signal processing tech- niques. Secondly, cross-range resolution is gained with a rotating table, and the high-resolution two-dimensional （2-D） imaging of the scale model is obtained by the microwave imaging theory. Finally, two receiving antennas with a small distance in altitude are used, and the three-dimensional （3-D） height distribution of scattering points on the scale model is extracted from the phase of images. Some typical bodies and a scale aircraft model are diagnosed in an anechoic chamber. The experimental results show that, after scaling with a metal sphere, the accurate one- dimensional （l-D） RCS pattern of the model is obtained, and it has a large dynamic range. When the bandwidth of the transmitting signal is 4 GHz, the resolution of the 2-D image can reach to 0.037 5 m. The 3-D height distribution of scattering points is given by interferometric measurement. This paper provides a feasible way to obtain high-precision scattering properties parameters of the scale aircraft model in a conventional rectangular anechoic chamber.     

Secure Two-Party Distance Computation Protocol Based on Privacy Homomorphism and Scalar Product in Wireless Sensor Networks

Numerous privacy-preserving issues have emerged along with the fast development of the Internet of Things. In addressing privacy protection problems in Wireless Sensor Networks(WSN), secure multi-party computation is considered vital, where obtaining the Euclidian distance between two nodes with no disclosure of either side’s secrets has become the focus of location-privacy-related applications. This paper proposes a novel Privacy-Preserving Scalar Product Protocol(PPSPP) for wireless sensor networks. Based on PPSPP, we then propose a Homomorphic-Encryption-based Euclidean Distance Protocol(HEEDP) without third parties. This protocol can achieve secure distance computation between two sensor nodes. Correctness proofs of PPSPP and HEEDP are provided, followed by security validation and analysis. Performance evaluations via comparisons among similar protocols demonstrate that HEEDP is superior; it is most efficient in terms of both communication and computation on a wide range of data types, especially in wireless sensor networks.     

对少年长跑运动员高原训练期间生理生化指标规律探究

随着竞技体育的发展,每个竞技项目的科技含量越来越高,势必要求业余体育训练也要进行科学训练。采用实验法、文献资料法和逻辑分析法,针对青少年长跑运动员的特点,运用科学监控手段与科学训练方法有机结合,进行深入的实践和研究,达到提高运动成绩的效果。     

Measurement of creep of optical fiber by a low coherent white light double interferometer system

The creep properties of optical fiber used in fiber optical sensors were studied in this paper.A low coherent white light double interferometer system was designed and calibrated and the creep deformations of optical fibers under static and cyclic loadings were measured with this device.The research results showed that polymer coated optical fibers crept at the beginning when they were under static or cyclic load.As the number of the cyclic loading or the static loading times increased the creep tended to s...     

Global view of Hopf bifurcations of a van der Pol oscillator with delayed state feedback

This paper presents both analytical and numerical studies on the global view of Hopf bifurcations of a van der Pol oscillator with delayed state feedback. Based on a detailed analysis of the stability switches of the trivial equilibrium of the system, the stability charts are given in a parameter space consisting of the time delay and the feedback gains. The center manifold reduction and the normal form method are used to study Hopf bifurcations with respect to the time delay. To gain an insight into the pe...     

我国青少年蹦床运动员训练手段的研究

运用问卷调查、数理统计、逻辑分析等研究方法,对我国潜优势蹦床项目青少年运动员队伍的现状进行分析,探究江苏、福建、上海、广西、广东、山西等八个省份青少年蹦床运动员队伍中存在的问题,在训练的基础上提出优化和改进的建议,以促进我国竞技体育事业的可持续发展。     

SP 3D在硫磺回收项目中的定制与开发应用

采用三维工厂设计系统SP 3D对某硫磺回收装置项目开展布置设计的过程中,通过定制、扩展和二次开发等工作,达到完善设计标准数据库和更加智能化工作的目的。举例介绍了管架数据库扩展、图面定制二次开发和地下管线交叉点报告等工作,展示了专业知识与专业软件的深入结合,可以提升设计效率和降低设计错误,从而提高了工程设计质量。     

In-plane elastic stability of fixed parabolic shallow arches

The nonlinear behavior of fixed parabolic shallow arches subjected to a vertical uniform load is investigated to evaluate the in-plane buckling load.The virtual work principle method is used to establish the non-linear equilibrium and buckling equations.Analytical solutions for the non-linear in-plane symmetric snap-through and antisymmetric bifurcation buckling loads are obtained.Based on the least square method,an approximation for the symmetric buckling load of fixed parabolic arch is proposed to simplif...     

The determination of atmospheric phosphine in Ny-lesund

Phoshpine (PH3), a volatile and toxic gas, has been proved to commonly exist in the environment.The determination of gaseous phosphine and its emission fluxes in Ny-lesund is reported in this paper.Results showed that gaseous phosphine exist in Arctic atmosphere commonly and the concentration of phosphine ranged from 16.3-600.2 ng/m3, with the maximum concentration of phosphine in tundra areas and the minimum in surface air of ocean.The concentration of phosphine ranged from 65.79-1259 ng/m3 in colliery at...