High-Precision Wideband Phase-Derived Velocity Measurement for Micro-Motion Extraction

A phase-derived velocity measurement method is proposed in a wideband coherent system, based on a precise echo model considering the inner pulse Doppler effect caused by fast moving targets. The Cramer-Rao low band of velocity measurement precision is deduced, demonstrating the high precision of the proposed method. Simulations and out-field experiments further validate the effectiveness of the proposed method in high-precision measurement and micro-motion extraction for targets with weak reflection intensity. Compared with the long-time integration approaches for velocity measurement, the phase-derived method is easy to implement and meets the requirement for high data rate, which makes it suitable for micro-motion feature extraction in wideband systems.     

大规模体积压裂诱发的地质灾变问题研究综述

页岩储层大规模体积压裂对储层实施改造,是实现非常规油气资源工业化开发的核心技术,但目前该技术的机理研究和应用都处于起步发展阶段。大规模体积压裂可能带来潜在的地质灾害风险,主要包括淡水资源的消耗、浅水层的污染、断层活化诱发地质灾害和地表侵蚀、甲烷泄露致空气污染、植被破坏等问题。从体积压裂机理入手,研究了上述存在的地质灾变风险及灾害发生机制,并从勘探调研合理的页岩气开采区块、设计科学的钻井完井方式、压裂液注入速率方案、实时监测断层破裂带应力及滑移状态以及废水废气回收处理等角度提出对应的科学指导和防范措施,对国内页岩气顺利开展工业化开采、避免潜在的地质环境灾变对人类产生危害具有重要的指导意义。     

基于FPGA的瞬态响应测试仪的设计与实现

为提高瞬态响应测试仪的测量精度和响应速度,提出了一种基于现场可编程门阵列(FPGA)实现的设计方法.系统设计采用Xilinx公司生产的Xilinx Spartan 3E XC3S500E PQ208 FPGA作为控制核心,实现了对瞬态响应的峰值时间、超调量及调节时间的精确测量,并且能较准确地绘制二阶系统的瞬态响应曲线.系统显示模块采用VGA显示,既节约了IO口资源,又可以更加逼真地显示相应曲线.系统可通过模拟开关实现单脉冲信号的输出,并扩展了语音提示功能,使用更方便.实际测试表明,系统具有运行稳定、参数测量精度高、抗干扰强及响应速度快的优点.     

基于改进等效电流量测变换的状态估计算法

介绍了基于等效电流量测变换的状态估计算法,并在此基础上提出了一种改进算法.应用抗差估计的理论构造了一组权函数,在每次迭代的过程中对权重不断修改,从而达到提高估计精度的目的.Matlab仿真实验结果表明,估计精度得到了提高.     

新型促染剂在涤纶常压分散黑ECT染色中的应用

将自制促染剂应用于涤纶分散黑ECT染料常压染色中,优化出涤纶常压沸染染色工艺,并评价该促染剂的效果。结果表明,加促染剂常压沸染染色织物的上染百分率、表观深度、耐摩擦色牢度及耐皂洗牢度与传统高温高压染色工艺效果相近,且明显比常压无促染剂染色工艺效果好,该促染剂的促染效果优良。     

打造线上线下一体化社会服务体系的研究与实践

以Y职业技术学院为例,根据校企合作的实践,校企共建了移动通信技术实习实训基地,探索了线上线下一体化社会服务机制,建设了移动在线教学与培训互动交流平台和开放共享的社会服务在线教学资源库,打造了线上线下一体化社会服务体系,在实践中取得了较好的成效,可以为其他通信院校的社会化服务新体系的建立提供经验指引.     

地面高精度磁测在新疆青河县贝勒克勒铁矿的应用

通过对新疆青河县贝勒克勒铁矿高精度磁法勘探资料的分析和研究,工作区可划分为西部、北部高磁异常区、中西部负值异常区、中部面积正负磁场平缓变化区、东部跳跃变化正值磁异常区,结合工作区岩矿石标本磁性参数可判别各类磁场类型形成的地质原因。划分局部磁异常6个,其中M1、M2、M3磁异常与地下隐伏含磁铁矿石英岩有关,M4、M5、M6磁异常与含铁石英岩有关。对局部典型异常M1、M4进行了半定量解释,并进行了钻探验证,实际验证结果与推断结果较为吻合。     

基于双元制校企合作机制下专业建设的实证研究

"双元制"是一种高职院校校企合作机制,由企业和职业院校共同培养高技能人才.根据校企合作的实践,校企共建了4G移动专业方向,实行了"校企共育,定向订单"人才培养模式,构建了模块化项目课程体系,开发了基于工作任务的项目化课程,形成了三位一体的专业教师团队,实现了4G移动实训基地的共建共享,成立了工程服务与创新应用中心,积极开展了社会服务.目前专业建设实证研究收到了良好成效,为其他院校同类专业建设提供参考.     

用变化代数能量自洽法研究NaH和CsH电子基态的解析势能函数

使用研究双核分子微观振动能量的变分代数法(variational algebraic method,VAM)计算获得NaH和CsH 2个分子电子基态的完全振动能谱;从这些精确的VAM完全振动能谱出发,利用变分代数能量自洽法(variational algebraic energy consistent method,VAECM),通过调节参数λ确定NaH-X1∑+和CsH-X1∑+ 2个分子电子基态的解析势能函数。获得的势能曲线能准确地重复电子态在低激发振动区域已有的实验振动能级,同时在高激发振动离解区和渐近区也给出一个准确的振动物理行为,并正确地收敛于实验离解能。研究结果表明,所获得的VAM完全振动能谱和VAECM解析势能函数优于目前其他方法的研究结果。     

Synchronization and bursting transition of the coupled Hindmarsh-Rose systems with asymmetrical time-delays

The study of synchronization and bursting transition is very important and valuable in cognitive activities and action control of brain as well as enhancement for the reliability of the cortex synapses. However, we wonder how the synaptic strength and synaptic delay, especially the asymmetrical time-delays between different neurons can collectively influence their synchronous firing behaviors. In this paper, based on the Hindmarsh-Rose neuronal systems with asymmetrical time-delays, we investigate the collective effects of various delays and coupling strengths on the synchronization and bursting transition. It is shown that the interplay between delay and coupling strength can not only enhance or destroy the synchronizations but also can induce the regular transitions of bursting firing patterns. Specifically, as the coupling strength or time-delay increasing, the firing patterns of the time-delayed coupling neuronal systems consistently present a regular transition, that is, the periods of spikes during the bursting firings increase firstly and then decrease slowly. In particular, in contrast to the case of symmetrical time-delays, asymmetrical time-delays can lead to the paroxysmal synchronizations of coupling neuronal systems, as well as the concentration level of synchronization for the non-identically coupled system is superior to the one of identical coupling. These results more comprehensively reveal the rich nonlinear dynamical behaviors of neuronal systems and may be helpful for us to have a better understanding of the neural coding.