试论勘测单位的技术创新

企业是技术创新的主体 ,勘测单位的发展与进步依赖于技术创新。要掌握经济发展的主动权 ,必须开展技术创新 ,必须大力发展高科技产业 ,只有这样 ,才能赢得经济效益 ,否则就意味着落后     

江苏省乡村经济类型的初步分析

本文采用模比系数法,按乡村经济发展水平、产业结构和农业结构三类指标,将江苏省65个县(县级市)划分为8个乡村经济类型(含12个亚类型),以便为乡村发展的宏观决策和分类指导提供参考,为开展江苏乡村地理的选点调查打下基础,对乡村经济类型的研究方法作初步尝试。     

跨接法概念之扩展及整体影象匹配

本文在一维单影象段跨接法的基础上,叙述了三方面的扩展:(1)将一维影象段扩展到二维影象段,从而增加了匹配单元内的信息量;(2)将面向单个特征扩展成为面向影象段;(3)将单个影象段的匹配推广到整体影象匹配,从而增加了整体的一致性。后者是将跨接法与动态规划相结合,将整体影象匹配归结为求解最优路径问题。 为了处理“遮蔽”问题或“噪声特征”,本文引入了虚拟状态的概念,它容许动态规划算法能够跨越一个或几个阶段。     

Individual and integrated pulse properties of PSR B0943+10 involved in the mode-changing phenomenon

The characteristics of the “burst” (B) mode and “quiescent” (Q) mode pulse sequences–long known from studies at or below 103 MHz–are identified at 430 MHz for the first time. An 18-minute, Polarimetrie observation begins with a long Bmode sequence, which has a higher average intensity, regular drifting subpulses, and a preponderance of primary polarisationmode radiation. An abrupt transition to a Q-mode sequence is then marked by a) weaker average intensity, but occasional very bright individual subpulses, b) a complete cessation of drifting subpulses, with disorganized subpulses now being emitted over a much wider longitude interval, and c) near parity between the primary and secondary polarisation modes, resulting in pronounced depolarisation, both of individual pulses and the average profile. Careful study, however, of profile changes before and after this mode change reveals slower variations which both anticipate the abrupt transition and respond to it. A slow attenuation of the intensity level of the dominant component is observed throughout the duration of the B-mode sequence, which then accelerates with the onset of the Q-mode sequence. This slow variation appears to represent a “preswitching transition” process; and the combination of effects on slow and abrupt time scales are finally responsible for the formation of the characteristic B and Q-mode average profiles.     

地球物理科学计算可视化应用系统的开发

本文介绍了以Ｗｉｎｄｏｗｓ９５为ｉ平台进行开发的用于地球物理数据处理的应用系统,它为地球物理数据提供提供了一种新的手段。     

基于滑模状态观测器的两自由度磁悬浮球控制

首先分析了磁悬浮球绕组磁力线扭曲特性,构建了含轴向和水平两自由度的磁悬浮球运动模型,采用模型转换,将系统中的匹配性和非匹配性干扰统一重构为匹配性干扰,建立新的系统状态空间方程;其次,针对悬浮气隙中气隙速度与加速度难以获取、干扰实时性观测困难的问题,提出了含干扰重构的气隙速度、加速度滑模观测器,并基于此观测器设计了滑模跟踪控制器;最后搭建含干扰重构的滑模状态观测和跟踪协同控制仿真平台,结果表明所提控制策略在动态响应速度、跟踪误差和抗干扰能力性能方面优于传统PID控制.     

基于去噪和分形的加密货币投资组合模型优化研究

为提高投资效益,本文针对传统投资组合模型的缺陷,结合经验模态分解（EMD）去噪法和多重分形消除趋势交叉相关分析法（MF-DCCA）,提出经验模态分解去噪下的多重分形投资组合模型（简称EMD-Mean-MF-DCCA）.将新模型应用于极具投机性的加密货币投资组合,结合滚动窗口技术进行样本外检验和分析,实证结果显示：无论加密货币价格处于上升还是下降趋势,EMD-Mean-MF-DCCA相对于其他传统投资组合模型及未去噪的分形投资组合模型,均在盈利能力和夏普比率方面具有明显优化效果,且当加密货币价格大幅下跌时,基于新模型的组合投资策略也具有较好的抵抗风险能力.     

基于FY-3号气象卫星的中国典型积雪覆盖区的时空动态研究

基于风云三号(FY-3)气象卫星的积雪产品数据(snow cover),提出了基于经验模态分解的趋势提取方法,探讨了2010—2019年中国积雪时空动态变化趋势。结果表明:1)中国积雪覆盖频率(Snow Cover Frequency,SCF)具有显著的季节性特征,呈现先增加后减少的特点,每年2月、3月SCF达到当年最大;东北的SCF呈显著下降的年际变化趋势,其他地区变化不大。2)中国整体的积雪覆盖率(Snow Cover Rate,SCR)下降了约1.2％,内蒙古和西藏的SCR下降了约1.5％,其他地区的SCR变化不显著;主要积雪覆盖区的SCR均在2016年发生由增加到减少的转变。     

Pulsations of microwave emission and flare plasma diagnostics

We consider the modulation of nonthermal gyrosynchrotron emission from solar flares by the ballooning and radial oscillations of coronal loops. The damping mechanisms for fast magnetoacoustic modes are analyzed. We suggest a method for diagnosing the plasma of flare loops that allows their main parameters to be estimated from peculiarities of the microwave pulsations. Based on observational data obtained with the Nobeyama Radioheliograph (17 GHz) and using a technique developed for the event of May 8, 1998, we determined the particle density n≈3.7×10¹⁰ cm^?3, the temperature T≈4×10⁷ K, and the magnetic field strength B≈220 G in the region of flare energy release. A wavelet analysis for the solar flare of August 28, 1999, has revealed two main types of microwave oscillations with periods P₁≈7, 14 s and P₂≈2.4 s, which we attribute to the ballooning and radial oscillations of compact and extended flare loops, respectively. An analysis of the time profile for microwave emission shows evidence of coronal loop interaction. We determined flare plasma parameters for the compact (T≈5.3×10⁷ K, n≈4.8≈10¹⁰ cm^?3, B≈280 G) and extended (T≈2.1≈10⁷ K, n≈1.2≈10¹⁰ cm^?3, B≈160 G) loops. The results of the soft X-ray observations are consistent with the adopted model.