竹青板作为风电叶片复合材料增强相的性能评价

针对目前玻璃钢叶片存在的问题,采用分级竹青板作为风电叶片复合材料的增强相,并利用INSTRON 5582 Grading能力学试验机进行检测.结果表明:由一二级竹青板制成的分级竹青层积材复合材料,其物理力学性能均达到或超过目前国外风电叶片在用的常规木材/环氧层积材的特性,完全能够替代目前大量使用的玻璃钢叶片材料.     

祁县子洪水库除险加固的环境影响评价

依据国家相关法律法规,对祁县子洪水库除险加固工程建设施工期的环境影响进行了评价,并提出环保措施。认为工程对环境的不利影响主要表现在施工期,但这是短期的;运行期对周边环境是有利的。     

江西永新斗上水库大坝工程地质问题分析评价

斗上水库位于江西省永新县城西北侧,是集灌溉、防洪、发电等功能于一体的中型水库.水库坝址区出露岩性为石英砂岩,工程区地质环境条件较为复杂.水库自20世纪70年代建成以来,一直处于带病运营状态,水库大坝渗漏、坝基肩稳定性等工程地质问题突出.该文以斗上水库为例,分析了其存在的工程地质问题,阐述了大坝工程地质条件对工程质量的影响,及对水库大坝后期运行管理的影响,对水库除险加固具有重要的指导意义.     

Evaluation of the extinction risk and of conservation alternatives for a very small insular population: the bearded vulture Gypaetus barbatus in Corsica

The bearded vulture Gypaetus barbatus is a large, long-lived osteophagus vulture whose abundance and breeding range have drastically declined during the last century, making it one of the most endangered European bird species. We evaluated the extinction risk of the bearded vulture population in Corsica (a small, isolated breeding population of 8-10 pairs), one of the last extant populations in Western Europe, and estimated its probability of extinction to be 0.165 over the next 50 years. A sensitivity analysis to assess the influence of uncertain demographic rates showed that it is critical to estimate precisely the values of pre-adult survival. Neither the type nor the parameters of density dependence acting on fecundity and survival rates influenced much the extinction risk of the Corsican population. We evaluated the effect of four realistic conservation actions that could be implemented on the Corsican bearded vulture population and rank them in terms of their respective decrease of the current extinction risk faced by this population. We found that the release of two juveniles every other year for 12 years and the increase of fecundity due to selective food provisioning would reduce by more than one-half the current extinction risk of Corsican bearded vulture population. In contrast, even substantial increases in the carrying capacity through large supplemental feeding produced very modest decreases in the extinction risk, thus calling into question the efficacy of one of the main pan-European conservation strategies for this species. Re-establishing a population network within the Mediterranean could be a potentially better strategy, though its efficacy depends on natal dispersal among populations that is currently unknown.     

建筑物结构可靠性鉴定的研究和应用

建筑物的结构可靠性鉴定是建筑使用中的一个重要问题，但在实际应用中却因认识不一而较少涉及。结合2个实例探讨结构可靠性鉴定的特点、等级划分、鉴定方法，并提出结构可靠性鉴定的目的是在于决策，在于得出合理的处理意见及利用方法。     

农村砌体结构房屋裂缝成因分析及预防处理措施

通过对农村砌体结构房屋的调查,列出了砌体结构房屋裂缝的类型并分析了其成因,提出了砌体结构房屋裂缝的预防、处理和加固的措施。     

消能减震技术在实际工程中的应用

介绍了消能减震的基本概念,并结合北京工业大学游泳馆抗震加固改造项目,阐述了阻尼器在实际工程中的应用。     

γ-纳米Al2O3补强耐磨橡胶衬板的性能研究

以γ型纳米Al2O3补强[天然橡胶（NR）/顺丁橡胶（BR）/炭黑]耐磨橡胶衬板,研究纳米Al2O3对橡胶衬板混炼胶的硫化特性和加工性能以及硫化胶的力学性能、耐磨耗性能和耐热分解性能的影响。结果表明,纳米Al2O3适宜的添加质量分数为3％,此时,橡胶衬板混炼胶的焦烧时间和正硫化时间延长、加工安全性改善但不会影响胶料的硫化程度,并具有较好的加工流动性;纳米Al2O3增强的橡胶衬板硫化胶具有更优异的综合力学性能,且其磨耗量降低了46.2％,初始降解温度提高了58 ℃以上,从而使橡胶衬板硫化胶具有良好的耐磨耗性能和热稳定性能。     

Effects of fiber length and orientation on elasticity of fiber-reinforced plywood

Short carbon fibers, a reinforced material in wood veneer composites, were used to investigate the effects of fiber length and orientation of fibers on the elasticity of plywood. The technical feasibility, elasticity, and strength of the reinforced plywood with short carbon fiber were evaluated. In a short fiber reinforcement system, the fiber length does not directly influence the reinforcement in Cox's theory when the fiber length exceeded a certain length. When the length of short carbon fiber is beyond 3 mm, the high reinforced result was obtained in the experiment. However, if fiber length was too long, the reinforced result was less owing to the bridge between fibers and the increase of holes. The optimum fiber length must be considered. The orientation of fibers has a strong influence on the reinforcement. Unidirectional, perpendicular, and random orientation displayed different influence on the elasticity. Experimental results were discussed with Cox's method. Reinforced plywood with short carbon fibers in random orientation has a higher shear modulus and bending strength than the controls, in addition to other mechanical properties.