大地电磁测深阶段式自适应正则化反演

如何合理确定正则化因子一直是地球物理反演的研究热点和难点。从提高反演稳定性的角度对正则化因子的选择进行考量,是确定正则化因子取值的新思路。此外,以往的正则化反演研究对非线性优化算法的随机性考虑不足。基于此,以Zhdanov提出的自适应算法为框架,提出了一种新的自适应正则化算法,即阶段式自适应算法,按照“阶段”自适应地调整正则化因子。将此方法分别应用于大地电磁测深（MT）的共轭梯度和差分进化算法（DE）反演。模型试验表明该算法可以提高反演的稳定性,在一定程度上降低衰减因子的影响,而且该算法具有同时适用于线性和非线性优化算法的特点。     

一种基于电话网的报警系统

介绍一种基于电话网且采用MT8888作DTMF信号的收发器件的报警系统，文中给出了MT8888与电话线的接口电路及软件流程图。     

效率为先：机器翻译译后编辑技术综述

译后编辑是近年来随机器翻译发展新兴的计算机应用研究领域。综述了译后编辑所涉及的三方面的技术问题：自动译后编辑,自动机器翻译质量评估以及译后编辑工作量测量。自动译后编辑与自动机器翻译质量评估均应用自然语言处理领域相关技术,通过自动完成部分编辑工作、筛选机器翻译译文来降低译员工作量,从而提高效率。对译后编辑工作量的研究侧重于分析机器翻译译文的错误对译员工作量的影响,为译后编辑系统环境的设计提供理论依据。总体而言,译后编辑技术研究的主要目的是提高译员的工作效率。     

基于MT3DMS的某采煤厂污染物运移模拟

随着工业化发展速度加快,大量采煤带来的环境污染问题日益突出。为了保护安康石煤开采区域的生态环境,掌握当地污染物运移规律尤为重要。因此,基于安康市2018年2月地下水流场资料,利用Visual Modflow中的MT3DMS模块建立溶质运移模型,对采煤厂污染易发区域的多种特征污染物在不同情况下的运移进行研究,并提出相应的污染防治建议。结果表明:当未采取任何措施时,Al~(3+)、Fe~(3+)和NH_4~+这3种特征污染物在泄漏1 000 d后超标面积在1 893～5 975 m~2之间;当安装防渗层或加快检漏频率后,仅NH_4~+在泄漏1 000 d后出现1 693 m~2的超标,其余污染物浓度均低于超标限。     

Constructing Multicast Routing Tree for Inter-cloud Data Transmission: An Approximation Algorithmic Perspective

Networking plays a crucial role in cloud computing especially in an inter-cloud environment, where data communications among data centers located at different geographical sites form the foundation of inter-cloud federation. Data transmissions required for inter-cloud federation in the complex inter-cloud networking system are often point-to-multi points, which calls for a more effective and efficient multicast routing algorithm in complex networking systems. In this paper, we investigate the multicast routing problem in the inter-cloud context with K constraints where K ≥ 2. Unlike most of existing algorithms that are too complex to be applied in practical scenarios, a novel and fast algorithm for establishing multicast routing tree for inter-clouds is proposed. The proposed algorithm leverages an entropy-based process to aggregate all weights into a comprehensive metric, and then uses it to search a multicast tree (MT) on the basis of the shortest path tree (SPT). We conduct complexity analysis and extensive simulations for the proposed algorithm from the approximation perspective. Both analytical and experimental results demonstrate that the algorithm is more efficient than a representative multi-constrained multicast routing algorithm in terms of both speed and accuracy, and thus we believe that the proposed algorithm is applicable to the inter-cloud environment.      

新型高速大容量雷达数据记录器设计

提出了一种新型高速大容量雷达数据记录器的设计。为了将有效速度为59MB/s的雷达回波数据流及时、可靠的存储到记录器中,系统逻辑使用了乒乓缓存技术将其分解为两路速度为29.5MB/s的数据流并分别交叉写入两片Flash,这样大大减轻了单片Flash操作时序的压力。同时单片Flash运用了交错式双平面编程和高效的无效块管理,最大化的提高了芯片的写入速度。此数据记录器已经通过了振动、高低温、电磁兼容和冲击等实验,运行可靠稳定,同时已经交付部队使用。     

MT炭黑在轮胎胎体胶中的应用

研究了ＭＴ炭黑在轮胎胎体胶中的应用,对试验配方作相应调整,并进行小配合,大配合及实际使用实验,结果表明,ＭＴ炭黑具有良好的分散性和加工性能,可改善混炼及压延工艺性能,提高半成品物理性能,可部分替代通用炭黑,半补强炭黑。     

应用人工智能搜索技术进行三维大地电磁测深反演的探索

基于人工智能中状态空间的启发式搜索技术,提出了一种全新的大地电磁测深三维反演新思路。其基本思想是把模型空间最化成有限模型集,而后按一定的搜索策略选择一个最有希望的模型进行正演计算,再把正演结果与观测数据比较并计算目标函数,如果目标函数小于给定值,则此时的模型即为反演结果,否则继续搜索,正演,比较,不断重复此过程,直到找到一个满意的解估计,作为一种通用的反演新思路,不但适用于大地电磁测深,还可以把该     

Modeling the effect of a microtubule swirl on fast axonal transport

Many neurodegenerative diseases, such as Alzheimer's disease, are linked to swellings occurring in the long arms of neurons. Many scientists believe that these swellings result from traffic jams caused by the failure of the intracellular machinery responsible for fast axonal transport; such traffic jam can plug an axon and prevent the sufficient amount of organelles to be delivered toward the synapse of the axon. One possible mechanistic explanation of the formation of traffic jams in axons induced by overexpression of tau protein is based on the hypothesis that the traffic jam is caused not by the failure of molecular motors to transport organelles along individual microtubules but rather by the disruption of the microtubule system in an axon, by the formation of a swirl of disoriented microtubules at a certain location in the axon. This paper develops a model for investigating the effect of a microtubule swirl, as well as the effect of reversing polarity of a microtubule segment in the swirl region, on fast axonal transport.     

窑用大齿圈缺陷的原因分析及其修复和改进实践

水泥用回转窑的大齿圈是回转窑的关键部件,也是生产制造控制中的重点、难点部件。结合10多条2500～6000t／d项目回转窑大齿圈制造、应用实践经验与教训,重点就大齿圈裂缝缺陷和凸台组织疏松、气孔缺陷的修复进行了详细介绍;同时对大齿圈的结构设计和制造工艺改进进行分析介绍。