Development of an Innovative Bituminized Jute Paving Fabric (BJPF) Along with its Commercial Field Trials for Potential Application in the Field of Geotechnical Construction with an Eye Towards Global Concern

In the last quarter of the twentieth century, a new class of materials, Geosynthetics, emerged prospectively leading significant innovation in the design of geotechnical and geoenvironmental systems. Geotextiles have proven to be among the most versatile and techno-economically viable ground modification materials playing a significant role in modern pavement design and maintenance techniques. With the growing environmental concern across the globe, technologists, researchers have inclined towards the natural geotextile where Jute Geotextile (JGT) is one of the potential candidates. But, JGT has been restricted mainly as underlay in road construction. Hence, there is an urgent need to design and develop a precise innovative fabric as overlay on existing pavements and other emerging civil works to stay technically and economically competitive in the global market. Such a fabric will not only prove techno-economically viable but will also reduce the carbon foot-print generation to a large extent. This paper delineates the development of Grey Jute Paving Fabric (GJPF) followed by its bituminization with suitable type and grade of bitumen to develop Bituminized Jute Paving Fabric (BJPF). The BJPF will enhance the life of the overlay thereby reducing the cost of maintenance as well as serving as a partial substitute of bitumen mastic.     

图像灰度匹配在多核环境下的优化

随着计算机技术的不断发展,图像匹配已经成为图片处理的一个重要部分。在图像匹配中,图像的灰度匹配虽然具有匹配精度高的优点但却需要大量的计算时间,且计算时间随着使用模版的增大而大幅度增长。文章在多核的环境下使用内存优化与处理器亲和力优化方法来解决计算时间长的问题。实验结果表明,使用并行技术并结合内存优化与处理器优化方法可大幅度减少计算时间、提高缓存的命中率、避免乒乓效应的产生使并行程序的加速比与并行效率有所提高。     

永磁同步电机的自调整灰色预测内模控制

针对永磁同步电机调速系统,提出自调整灰色预测内模控制器。利用自调整灰色预测在线实时对转速误差进行预测,内模控制依据系统下一时刻的输出响应控制输出变量。仿真结果表明,永磁同步电机调速系统采用自调整灰色预测内模控制后在快速性、抗干扰性和鲁棒性方面都有明显提高,系统的动静态性能都优于单一使用内模控制和自调整灰色预测控制。     

基于灰色关联度的风机MPPT控制影响因素分析

鉴于现有研究未明确指出诸多因素对风机最大功率点跟踪控制性能的影响程度及其主导因素,基于灰色关联度理论定量评估了多种相关因素对最大功率点跟踪控制性能的影响程度。以多种影响因素作为子序列,包括空气密度、风速湍流强度、平均风速、风力机转动惯量、半径和最佳叶尖速比,将评估最大功率点跟踪控制性能的平均风能利用率作为主序列,通过灰色关联度分析获取这些因素对平均风能利用率的影响程度。研究结果表明,湍流强度和转动惯量是影响风机最大功率点跟踪控制性能的主导因素,应在风力机结构设计和最大功率点跟踪控制系统优化时重点考虑。     

面向装备作战效能评估的灰靶理论综合模型

针对武器装备作战效能评估结果对其作战运用的指导问题,提出一种面向装备作战效能评估的灰靶理论综合模型。给出邓氏灰靶理论并分析其在装备作战效能评估中的应用缺陷;介绍基于TOPSIS方法理念的装备作战效能评估的综合靶心度模型,包括虚拟灰色靶心的构造、基于灰色关联度的综合靶心度模型等;给出4部超短波地面通信对抗系统的作战效能评估实例。分析结果表明,该综合评估方法具备合理性和有效性。     

Assessing Grey Squirrel Dispersal Patterns within the Landscape Using Sequence Variation

Abstract

The grey squirrel Sciurus carolinensis is thought to have contributed to the decline of red squirrel S. vulgaris populations in the UK through resource competition and disease spread. This study used mtDNA sequencing to assess patterns of grey squirrel dispersal in the UK. Patterns of genetic variation within the dloop sequence were characterised for seven grey squirrel populations. Infiltration directions and potential barriers to dispersal are identified and discussed, with a focus on Cumbria, a county at the forefront of grey squirrel expansion. Understanding the dynamics of grey squirrel dispersal will aid their management at a landscape scale and enhance the conservation of red squirrels.     

WASTE FLOW ALLOCATION PLANNING THROUGH A GREY FUZZY QUADRATIC PROGRAMMING APPROACH

This paper proposes a grey fuzzy quadratic programming (GFQP) approach as a means for optimization analysis under uncertainty. The method combines the ideas of grey fuzzy linear programming (GFLP) and fuzzy quadratic programming (FQP) within a general optimization famework. It improves upon the previous GFLP method by using n grey control variables, ® (A,j (i = 1,2,..., n), for n constraints instead of one ® (X) for n constraints in order to incorporate the independent properties of the stipulation uncertainties; it also improves upon the FQP method by further introducing grey numbers for coefficients in A and C to effectively reflect the lefthand side uncertainties. Compared with the GFLP method, the GFQP approach is helpful for better satisfying model objective/constraints and providing grey solutions with higher system certainty and lower system cost; compared with the FQP method, more information of the independent uncertain features of not only the stipulations but also the lefthand side coefficients are effectively reflected in the GFQP method.

The GFQP modelling approach is applied to a hypothetical case study of waste flow allocation planning under uncertainty, with the input model stipulations fluctuating within wide intervals and having independent uncertain characteristics. The results indicated that reasonable solutions have been generated. Comparisons between the GFQP and FQP/GFLP solutions are also provided, which demonstrate that the GFQP method could better reflect system uncertainties and provide more realistic and applicable solutions with lower system uncertainties and higher system benefits.     

基于灰色理论的道路全生命周期造价控制探讨

介绍了灰色理论GM(1,1)模型的原理,利用某新建城市Ⅰ级主干道已有造价信息数据建立GM(1,1)模型,根据模型对工程造价进行预测,并验证了预测结果的合理性,从而证明了灰色理论在市政工程道路全寿命周期造价控制中的适用性。     

基于泛灰数学的不确定链式结构系统固有频率分析

针对不确定因素对系统动力特性的影响,在应用泛灰数学的基础上,对不确定链式结构系统固有频率的求解方法进行了研究。首先,通过对泛灰数四则运算结果的分析,指出了利用泛灰数进行区间分析存在的缺陷,提出了一种改进的泛灰数除法运算规则,进而将链式结构系统中的不确定性参数用泛灰数表示;其次,基于矩阵传递法,导出了系统固有频率的非线性泛灰方程,并针对该方程的求解,在运用泛灰数运算规则的基础上,提出了一种区间搜索进退算法;最后,通过算例说明了笔者算法的可行性和求解方法的有效性。     

基于灰色理论的电圆锯蜗轮磨损失效评价方法

针对多功能小型手持式电圆锯蜗轮磨损失效评价过程存在着少数据、数据不清晰等问题,利用灰色理论中GM(1,1)模型,结合蜗轮失效所隐含的噪声、工作电流和温度等参数变化,构造基于灰色理论的电圆锯蜗轮磨损失效评价模型。通过实例计算介绍该评价方法的评价过程,同时也证明了该方法的可行性和实用性,为电圆锯蜗轮磨损提供了一种新的预测方法。