The two main objectives of this research were (1) to propose a new subgrade soil stabilization protocol to allow CDOT and other transportation agencies to rely upon an alternative stabilization method that is not subject to the typical problems associated with calcium-based stabilization of sulfate-rich soils (the proposed technology is also appropriate to stabilize sulfate-free subgrade soils), and (2) to develop a new database of MEPDG parameters for local soil samples obtained from CDOT and to provide advanced testing and analysis of the stiffness degradation of these materials. The beneficial use of scrap tire rubber mixed with expansive soils is of interest to civil engineering applications since the swell percent and the swell pressure can be potentially reduced with no deleterious effect to the shear strength of the mixture.

关键词：土壤稳定;硫酸盐;公路建设;混合物;路面;橡胶;

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The working condition of the condenser in power plant is an important factor that affects the economic operation of the power plant.Rubber ball cleaning is a main method to deal with the condenser fouling.The thesis,dealing with the problem of counting errors of rubber ball in the process of condenser cleaning,based on CPLD(Complex Programmable Logic Device) technology,designs a programme have rubber balls checking and counting automatically.The program takes use of the controlled laser sensors to count the number of rubber balls in every single pipe and the parallel processing capacity of CPLD,and have the number of different pipes counted and shown.Experiments have proved its constancy and accuracy.

关键词：冷凝器;皮球计数; CPLD;激光传感器;橡胶

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This study explored the feasibility of using movable and reusable boarding and alighting (B&A) pads at bus stops. Potential design alternatives in terms of materials and structural support for these pads were evaluated. The review focused on the existing and alternative design materials, especially in applications other than for transit purposes, which could potentially replace the existing conventional cast-in-place concrete slab. An online national survey of bus transit agencies was conducted to determine how transit agencies are meeting the Americans with Disabilities Act (ADA) bus stop accessibility requirements and to get feedback and related information on the potential use of movable B&A pads at bus stops. A total of 84 transit agencies from 31 states and Puerto Rico responded to the survey. From the responses, none of the transit agencies were found to be using movable B&A pads. The potential benefits for using movable B&A pads were identified to be lower installation and maintenance cost, ease of installation and use, quicker installation, flexibility, portability, and passenger accessibility. Some potential concerns included lower durability, strength, and stability; greater risk of theft; space limitations; safety; and aesthetics. Six materials (i.e., concrete/asphalt, metal, rubber, thermoplastic, composite, and wood), along with their commercially available products, were evaluated based on their structural performance, long-term durability, adaptability, life cycle cost, aesthetics, and safety and accessibility of transit riders with mobility devices. Out of the six materials, plastic lumber and metal were found to have the highest potential to replace the conventional design. The plastic lumber presents the most viable option but the metallic materials, even though more expensive, have more potential for quicker installation, which can benefit transit agencies with anticipated frequent route changes.

关键词：公共交通；橡胶；上下车（BA）垫；耐久性；材料

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When fire occurs in a concrete structure, it is hard to extinguish it because of its unique form and location, which results in a very high internal temperature of the maximum 1400℃.Due to the fine structural characteristic of concrete, the structure is likely to suffer fatal damages such as the reduction of resisting force and the damages to the cross section caused by explosive fracture.In this research, the author tested the effect of fire on structures by using fire boards with perlite-added silicone and confirmed that the fire resisting capacity varies according to the weight ratio of the addition agent, which shows what effect perlite has for the pyrolysis process.A fire resisting capacity test was also carried out by attaching a silicone composite fire board to a real size specimen.As a result of the test carried out by installing the fire boards with different thickness by section, most fire boards had excellent fire resisting capacity, and fire boards with 20mm or more thickness had also excellent fire resisting capacity.

关键词：硅橡胶；硅树脂/珍珠岩复合材料；防火耐板；橡胶

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关键词：阻尼；镓合金；铁；水利；磁致伸缩

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The goal of the Sustainable Painting Operations for the Total Army (SPOTA) program is to significantly reduce the amount of hazardous air pollutant (HAP) emissions produced in coating operations, including adhesives application and removal. Adhesives and sealants account for approximately 5of U.S. Army-wide HAP emissions from surface coating operations. Materials conforming to Federal specification MMM-A-121 have been identified as one of the largest contributors. The purpose of this research is to demonstrate and validate the HAP-free alternative adhesive 3M-847 in place of the baseline materials 3M-1357, Clifton E-1293, and 3M-1300L adhesive for specification MMM- A-121. Based on 2003 data, switching from the baseline adhesives to the alternative 3M-847 would mean an Army-wide reduction of over 1000 lb/year of HAP emissions. This report summarizes the methods for successfully field testing adhesive on an aviation helmet (model no. HGU-56/P) edge beading preventative maintenance/repair and a U.S. Army UH-60 Black Hawk helicopter nose door seal, conducted at Lowe Army Heliport, Fort Rucker, AL. An additional field trial was conducted at Anniston Army Depot, AL, on a Stryker infantry carrier vehicle driver s access hatch seal with successful results. In particular, technicians found that processing the alternative adhesives was similar to that of the baseline, and after 6 months, the adhesive did not have any signs of blistering, delamination (either cohesively or adhesively), substrate failure, or deterioration of any kind. Overall, the HAP-free 3M-847 adhesive was qualified for use on MMM-A-121 requisite substrates, such as vulcanized rubber (styrene-butadiene rubber, neoprene, and nitrile) bonded to unpolished steel, in addition to alternative substrates, such as silicone rubber and lightweight composite materials, showing a high versatility to the 3M-847 adhesive.

关键词：胶粘剂;空气污染;羟基磷灰石；橡胶

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This paper presents an experimental study of the performance of a single track device driving on dry, granular soils. A single-track test rig is used to empirically investigate track motion under controlled track slip and loading conditions on three natural dry granular materials:a dry sandy material with 100 um average grain size, a dry sandy material with 400 um average grain size, and a coarse gravel with 1 cm average particle size. Test conditions can be designed to replicate typical field scenarios for lightweight robots, while key operational parameters such as drawbar force, torque, and sinkage are measured. This test rig enables imposition of velocities, or application of loads, to interchangeable running gears within a confined soil bin of dimensions 1.5 m long, 0.7 m wide, and 0.4 m deep. The tested single track device has an effective contact area measuring approximately 25 cm x 10 cm and it is tested under three vertical loads 125 N, 155 N, and 190 N. Slip is varied within -50and +50during travel over the three soils. The track utilizes a flexible rubber belt equipped with 0.5 cm tall grousers. Experimental measurements are compared against well-established semi-empirical models, to assess the predictive accuracy of these models.

关键词：粒状材料;性能（工程）;履带车辆;干燥材料

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2014年5月，轻工行业在推进产业转型升级的基础上，积极拓展国内外消费市场，总体持续向好，出现企稳回升态势。与此同时，轻工行业进出口额整体保持稳定，行业经济运行质量总体有所改善，但细分行业差异化明显。在保持行业稳定增长的前提下，行业未来发展将集中在产业结构优化上，而消费升级、城镇化进程加快、社会消费水平的提升则给行业发展提供了稳固的需求基础，预计2014年上半年轻工行业规模以上企业产品销售收入约为12万亿元，同比增长约14%。

关键词：造纸；纸制品；家具；纸浆；塑料制品

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前4个月，物流与生产资料市场运行基本平稳、结构优化。一方面，市场规模增速稳中小幅回落，但保持较快增长；另一方面，在增速回落的同时，市场结构向好转变、流通方式加快转型。当前经济运行中值得关注的问题，主要表现在两个方面：一是宏观层面上，投资需求偏弱;二是微观层面上，企业资金紧张、应收账款大幅上升。此外，企业经营面临的政策环境有待进一步优化。从后期走势看, PMI 指数连续两个月小幅回升，市场需求有所改善，生产资料市场价格呈现出趋稳走势，显示出宏观经济运行积极向好发展具有一定的基础。在此背景下, 行业保持平稳运行仍具备有利条件。

关键词：煤炭；钢材；有色金属；天然橡胶；汽车

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一季度，物流与生产资料市场开局平稳、总体良好。一方面，市场规模增速虽然有所回落，但仍保持较快增长，尤其是3 月份以来，呈现企稳运行走势；另一方面，更为重要的是，在增速回落的同时，市场结构向好转变、流通方式加快转型，市场发展质量提升。预计上半年物流市场与生产资料销售总额增速较一季度有所回升，能够支持宏观经济运行在合理适度区间。

关键词：煤炭；钢材；有色金属；天然橡胶；汽车

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