基于高精度模态环境振动测试及导入最佳平差参数的桥梁在线抗弯刚度识别方法

提出了一种基于高精度低阶测试模态对桥梁构件抗弯刚度通过导入最佳参数进行平差的最小二乘解识别方法。通过对混凝土试验梁及一座3跨变截面连续箱梁抗弯刚度现场检测及数值模拟计算,结果表明,此方法有效地抑制了模态振型测试误差对识别精度的过度影响,即使对1．5％的锯齿形严重模态振型误差及20％的偶然模态振型误差,识别精度都在6％左右,较好地满足工程精度要求。此外,通过多例模拟数值计算表明锯齿形模态振型误差可作为识别精度的控制性误差。     

面向生产计划调整的资源参数反演逆优化方法

原生产计划是满足预测产品种类及数量需求的成本最小化的生产计划.然而,实际需求常常与预测不符,当获取实际需求数据后,需要对原生产计划进行动态调整.基于此,以逆优化为方法论,将面向生产计划调整的资源重配置问题,转化为一个已知实践最优生产计划,反向求解让该实践方案成为在调整后的参数下的原生产计划模型最优解的反演问题.该反演问...     

基于混合优化方法的立体匹配算法

为了改善线性生长算法获得视差图可靠性差的问题,提出了一种基于混合优化方法的立体匹配算法。该算法综合考虑了计算效率和图像可靠性,将视差匹配转换为多目标优化问题,通过提出的基于模拟退火的鸽群优化算法求解此优化问题,从而实现视差阈值的自适应调节,并获取相应的根点的最优视差值。所提出的混合优化方法较好地克服了局部寻优和全局寻优方法易受初值影响且收敛速度慢的缺点。此外,为了进一步提高视差图可靠性,利用滤波法去除不可靠的视差。仿真结果表明,该算法可以获得更多深度信息,提高了线性生长算法计算视差图的可靠性和鲁棒性。     

调节阀式粘滞阻尼器原理与性能试验

为了改进线性粘滞阻尼器的消能减振性能,研制了一款调节阀式粘滞阻尼器.该型阻尼器由缸筒、导杆、活塞、阻尼孔、阻尼介质以及压差调节阀组成.阻尼器在工作时,阻尼介质在活塞两端压差的作用下往复流经阻尼孔,消耗外界输入的能量;调节阀通过调整阀口开启压强的大小来控制活塞两端的压差,进而控制阻尼器的最大输出阻尼力.根据该型阻尼器的构造及工作原理,建立了阻尼器的力学模型,并对其进行了力学性能试验.试验结果表明,该阻尼器在不同强度的激励下,均能有效地耗散输入能量,并能稳定地控制其最大输出力,且力学模型能够比较准确地反映阻尼器的实际受力情况.     

决策矩阵P.L.Yu解法的调整和应用

目前在县域经济的发展中,经常要对各产业结构的比例或各业重要性程度的排序作出判断.但由于较复杂的各种主客观因素,严重影响了其数量化后的客观真实性或主客观的一致性.针对该量化的决策判断矩阵,对P.L.Yu算法进行调整和更强的一致性检验,并将其应用到山东陵县五业发展的具体背景中.图1,参3.     

渤海油田综合调整方案研究

绥＊油田位于渤海辽东湾海域辽西低凸起中段，历经十余年的开发，逐渐暴露出层间矛盾显著、注入水单层突进现象明显等问题。为充分动用地质储量。加快采油速度、提高最终采收率，有必要对其进行综合调整。在调整方案研究中，动静态结合，对剩余油分布进行充分研究并对不同加密形式等方案进行了大量的对比论证。     

巧用PLC编程解决桥式起重机遥控器更换问题

介绍了桥式起重机遥控器控制方式的选择,阐述了如何使用PLC编程以简单型遥控器控制复杂动作,使操作工更加轻松方便地操作遥控型桥式起重机,并降低桥式起重机遥控器使用及维护成本。     

经济结构调整:践行科学发展观的现实支撑

践行科学发展观从持续提高经济效益、改善可持续发展能力、实现全面协调发展目标、落脚于人的全面发展等对经济结构合理性提出了新的要求。然而,产业结构不合理、区域经济发展不平衡、城乡二元结构以及经济增长与社会和人的发展不匹配等结构性矛盾对践行科学发展观带来了新的挑战。因此,从物质基础、现实抓手和实践手段等层面看,调整经济结构是践行科学发展观强有力的现实支撑。     

Impact of gamma radiation and salinity on growth and K+/Na+balance in two populations of Medicago sativa(L.)cultivar Gabès

The perennial Medicago sativa cv.Gabès is widely grown on saline soils in Tunisian oases.Morphological and physiological analyses of two populations(Mareth and Gannouch)were conducted in order to study the effect of salinity and gamma radiation(350 Gy)inter-action on two populations of this species.It has been shown that the two irradiated populations of Medicago sativa are fairly tolerant to salt at growth phase compared to the non-irradiated.Exposure to gamma irradiation(350 Gy),alone or in combination with salt stress,increased significantly (p<0.00 1)shoot number,stem height and chlorophyll b pigment especially for the Gannouch population,while no change occurred for the Mareth population.The presence of salt to 9 g/1 affected significantly the root biomass and induced a reduc-tion of shoot development of both control and irradiated alfalfa populations.For all treatments,plants of two populations remained able to produce and to allocate dry matter to the different organs.The survey of Na+/K+ratio showed that the growth of the aerial organs of two non-irradiated populations was at least determined by a selectivity in favour of the K+ions r2=0.97 and r2=0.59 for Mareth and Gannouch non-irradiated populations,respectively).However,the rather weak correlation detected for the irradiated populations,par-ticularly for the irradiated Gannouch.seems to be the consequence of the effect of irradiation that improved potassium availability.essential element for growth and development.Results also showed that the two irradiated populations,especially the Mareth,accumu-lated Na+ions in its photosynthetic organs.This accumulation was associated with an improvement of foliar water content at a level of salinity around 5 g/1.Such a mechanism reflects probably an inclusive behaviour of the plants and a good aptitude to use the dominant ions(Na+)for the osmotic adjustment.However,the non-irradiated populations are unable to adjust their internal osmotic potential.Consequently,irradiated plants have probably adapted to the osmotic stress by either closing their stomata or increasing the osmotic pressure of the leaf cells.     

INTELLIGENT EARLY-WARNING SUPPORT SYSTEM FOR ENTERPRISE FINANCIAL CRISIS BASED ON CASE-BASED REASONING

Case-based reasoning （CBR） is an important reasoning technique of expert system. In this paper, the authors introduce CBR to intelligent early-warning support system, which could warn quantitatively for enterprise financial crisis and could warn qualitatively by expert＇s knowledge and experience. Furthermore, genetic algorithm is applied to case-based reasoning in CBR-IEWSS, which improves accuracy and efficiency of case retrieval. Last, the structure of CBR-IEWSS is given.