梯级水库群多目标优化调度规则研究——以溪洛渡-向家坝为例

为完整利用水库群多目标优化调度的非劣前沿信息,提出了一种优化调度函数参数、追求调度结果逼近非劣前沿的新型调度函数提取方法。对于水库群多目标优化调度模型,采用非支配排序多目标优化算法II（NSGA-II）求解,分别获取丰、平、枯典型年的非劣前沿集,将其作为代理模型的训练样本,实现二维非劣前沿的函数表达。采用多元线性构型构建调度函数,以调度结果逼近非劣前沿为目标,优化调度函数的参数项。该方法避免了多目标优化调度函数提取因决策破坏非劣前沿完整性,追求调度结果即为非劣解,在溪洛渡-向家坝水库群得到了验证,成功提取了针对非汛期发电、生态两目标的丰、平、枯典型年调度函数,并在相似来水年份下验证了结果的合理性。     

Alzheimer’s Disease Animal Models: Elucidation of Biomarkers and Therapeutic Approaches for Cognitive Impairment

Alzheimer’s disease (AD) is an age-related and progressive neurodegenerative disorder. It is widely accepted that AD is mainly caused by the accumulation of extracellular amyloid β (Aβ) and intracellular neurofibrillary tau tangles. Aβ begins to accumulate years before the onset of cognitive impairment, suggesting that the benefit of currently available interventions would be greater if they were initiated in the early phases of AD. To understand the mechanisms of AD pathogenesis, various transgenic mouse models with an accelerated accumulation of Aβ and tau tangles have been developed. However, none of these models exhibit all pathologies present in human AD. To overcome these undesirable phenotypes, APP knock-in mice, which were presented with touchscreen-based tasks, were developed to better evaluate the efficacy of candidate therapeutics in mouse models of early-stage AD. This review assesses several AD mouse models from the aspect of biomarkers and cognitive impairment and discusses their potential as tools to provide novel AD therapeutic approaches.     

多元靶碰撞级联中的粒子能量

用一种推广的幂指数散射截面求解了溅射输运方程，获得更加一般的渐近解，这个渐近解不但以Urbassek等人几年前所给出的两个解为其特殊情况，而且还为作者提出的SC解提供了新的证据，此外通过计算并分析了Vicanek等人发表的新的输运理论，发现他们所提出的转换理论结果与Monte Carlo模拟结果一致是不正确的。     

Stage-efficiency of centrifugal extractor used in nuclear industry

1　INTRODUCTIONComparedwithamixer settlerorpulsedcolumnusedinthenuclearfuelreprocessingextraction pro cesses,ashort residence timecentrifugalextractorcatchesresearcher seyesbecauseofthe goodphaseseparationandasmallhold upvolume .Itshowsthefollowingadvantagesinthenuclearindustry[1] :1)Reducingsolventdegradationduetoradiation ;2 )Reducinginventoryofaqueousandorganicphases ,whichgivesrapidstart upandshut down ;3)Com pactdesignthatcontributestothereductionofplantcost .Manydifferenttypesofcen…     

酯化釜塔顶温度控制系统改造

介绍了串级控制在仪化研究院半连续聚酯试验装置酯化釜塔顶温度控制上的应用,解决了酯化釜塔顶温度调节滞后问题,提高了调节过程的品质     

苗家坝-碧口梯级水库汛期水位动态控制研究

本文将单一水库预泄能力约束法,推广到梯级水库汛期水位动态控制中,并建立了梯级水库汛期水位联合运用和动态控制模型,假定预报信息准确,在不降低下游保护对象的防洪标准的前提下,最大限度发挥梯级水库的兴利效益。以苗家坝、碧口水库为对象进行了实时调度模拟,其结果相比于原设计汛限水位动态控制方案,减少了弃水,且保证最大出库流量均在可控范围内,达到在不降低防洪标准的前提下提高梯级水库兴利效益的目的,大大提高了洪水资源利用率。     

洞内淹没射流及水平旋流梯级内消能的适用性研究

为了适应高水头泄洪消能的需要,提出了一种新型的泄洪内消能工,即洞内淹没射流与水平旋流梯级内消能工。以流量1 200 m3/s、最大总作用水头150m为标准进行了该消能工的体型设计,然后对设计的消能工进行了1∶60.25几何比尺下的水工模型试验。结果表明:下游出现与明渠相似的多种水跃流态,淹没射流孔口系数0.5~0.56,起旋器喉口流量系数0.32~0.35之间;旋流空腔直径先增大后迅速减小最后平稳,在旋流阻塞孔口处空腔直径又迅速增大最后稳定;下游水位H下小于2.0 D时,下游旋流洞段压强相对变化幅度较小,H下大于2.0D时,上下游水位对旋流洞压强影响较大;上游水位的变化不影响淹没射流速度相对变化,下游水位的变化,对水平旋流洞段影响较大;上游淹没射流消能、竖井消能、旋流洞消能与下游旋流阻塞扩散消能的消能率分别占总消能率的15%、10%、30%、10%,其中下游水平旋流洞段承担主要消能部分。     

Modeling and global trajectory tracking control for an over-actuated MAV

This paper deals with an original micro aerial vehicle (MAV) design, the Omnicopter MAV. It has two central coaxial rotors with fixed-pitch propellers and three perimeter mounted ducted fans with servo motors performing thrust vectoring. Compared with traditional rotary wing MAVs that have inherent underactuation, the Omnicopter possesses some advantages in mobility, for example, lateral translation with zero attitude and hover with nonzero attitude. The trajectory tracking control design, global stability analysis, and control allocation are demonstrated through numerical simulation. The advantage of zero attitude translation is illustrated through experimental results.     

MDI子窗体最佳层叠平铺算法及程序实现

针对VB 6.0编程软件界面不够美观,需要使用第三方皮肤系统进行界面美化,以及Skinsharp等高效的皮肤控件对MDI窗体的支持不够稳定,经常出现移动窗体后无法对窗体重新排列的问题,提出了模拟VB对MDI窗体的排列效果,实现与VB类似的MDI窗体平铺算法,实现了层叠、水平和垂直三种排列效果,并在此基础上增加了弹性层叠功能和固定窗体次序功能。所用方法解决了加载皮肤后子窗体无法排列的问题。结果表明：所用算法的执行效率不高,只有VB方法的二分之一,特别是加上皮肤后层叠的效率下降较多;但当窗体数量较少时,所用算法具有一定实用性,可以作为加载皮肤系统时VB默认排列的替代方法。     

智能混合控制器在转炉干法除尘中的应用

转炉干法除尘蒸发冷却器出口烟气温度大多数采用常规串级控制方式,但转炉冶炼前期控制效果并不理想.对转炉冶炼过程及蒸发冷却器出口烟气温度的控制难点进行研究,找出常规串级控制方式的缺点,并设计出一种智能混合控制器.采用智能模糊控制器和常规控制器并联的控制方式,对蒸发冷却器出口烟气温度进行控制,控制效果理想.实际应用表明,同常规串级控制器相比,智能混合控制器具有响应快、被控对象稳定等优点.