The Conserved and Specific Roles of the LUX ARRHYTHMO in Circadian Clock and Nodulation

LUX ARRHYTHMO (LUX) plays a key role in circadian rhythms and flowering. Here, we identified the MtLUX gene which is the putative ortholog of LUX in Medicago truncatula. The roles of MtLUX, in both the nodulation belowground and leaf movement aboveground, were investigated by characterizing a loss-of-function mtlux mutant. MtLUX was required for the control of flowering time under both long-day and short-day conditions. Further investigations showed that the early flowering in the mtlux mutant was correlated with the elevated expression level of the MtFTa1 gene but in a CO-like independent manner. MtLUX played a conserved role in the regulatory interactions with MtLHY, MtTOC1, and MtPRR genes, which is similar to those in other species. Meanwhile, the unexpected functions of MtLUX were revealed in nodule formation and nyctinastic leaf movement, probably through the indirect regulation in MtLHY. Its participation in nodulation is of interest in the context of functional conservation and the neo-functionalization of the products of LUX orthologs.     

Molecular Cross-Talk between Gravity- and Light-Sensing Mechanisms in Euglena gracilis

Euglena gracilis is a photosynthetic flagellate. To acquire a suitable position in its surrounding aquatic environment, it exploits light and gravity primarily as environmental cues. Several physiological studies have indicated a fine-tuned relationship between gravity sensing (gravitaxis) and light sensing in E. gracilis. However, the underlying molecular mechanism is largely unknown. The photoreceptor photoactivated adenylyl cyclase (PAC) has been studied for over a decade. Nevertheless, no direct/indirect interaction partner (upstream/downstream) has been reported for PAC. It has been shown that a specific protein, kinase A (PKA), showed to be involved in phototaxis and gravitaxis. The current study reports the localization of the specific PKA and its relationship with PAC.     

α-生育酚琥珀酸酯对过度运动小鼠NK细胞平衡及ApoE基因表达影响研究

通过α-生育酚琥珀酸酯作用于过度运动小鼠,观察其对小鼠NK细胞平衡及ApoE基因表达的影响。结果表明:α-生育酚琥珀酸酯对于克服过度运动小鼠免疫抑制现象具有显著作用,主要表现为CD3+、CD16+、CD56+细胞因子极显著下降(P0.01);ApoE mRNA及ApoE蛋白表达量极显著上升(P0.01)。不同剂量α-生育酚琥珀酸酯作用效果有一定差别,高剂量组NK细胞平衡及ApoE表达显著优于低剂量组(P0.05)。     

高层建筑火灾燃烧规律的数值模拟研究

以高层建筑为研究对象,应用FDS软件对高层建筑火灾燃烧规律进行数值模拟计算。得到了高层建筑火灾时的烟气运动、着火点附近区域温度变化、CO2浓度变化等火灾参数变化规律的数值模拟计算结果,计算结果显示,在高层建筑火灾发生300s左右时,火灾开始进入轰燃阶段,火场烟气迅速蔓延,火场温度迅速上升到600℃。数值模拟计算结果为高层建筑性能化防火设计及人员紧急疏散提供一定的理论依据。     

两墨辊对滚过程中相邻墨区间的影响

对两墨辊的对滚转动进行了模拟仿真分析, 旨在研究相邻墨区之间的相互作用, 以及主动辊的串动对油墨流动特性的影响.为此, 以相邻5个墨区进行仿真分析.对中间墨区墨量等于、小于和大于相邻墨区3种情况下墨辊的对滚转动模拟仿真, 以对比分析相邻墨区对中间墨区的影响.分析得出, 在两墨辊对滚转动的过程中, 相邻墨区之间相互作用, 使得墨辊上油墨流场的压力、轴向速度、墨层厚度都受到影响.对主动辊有轴向串动时, 分析中间墨区的压力、轴向速度、墨层厚度可知, 主动辊的串动增大了相邻墨区之间的相互影响.     

Orthogonal design and numerical simulation of room and pillar configurations in fractured stopes

Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining. To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas, an orthogonal design with two factors, three levels and nine runs was proposed, followed by three-dimensional numerical simulation using ANSYS and FLAC3~. Results show that surface settlement after excavation is concentrically ringed, and increases with the decrease of pillar width and distances to stope gobs. In the meantime, the ore-control fault at the ore-rock boundary and the fractured argillaceous dolomite with intercalated slate at the hanging wall deteriorate the roof settlement. Additionally, stope stability is challenged due to pillar rheological yield and stress concentration, and both are induced by redistribution of stress and plastic zones after mining. Following an objective function and a constraint function, room and pillar configuration with widths of 14 m and 16 m, respectively, is presented as the optimization for improving the ore recovery rate while maintaining a safe working environment.     

浅层时序灌溉条件下入渗压力对水分运移的影响

为寻找合适的浅层灌溉方法,采用水平方向和垂直方向的一维压力入渗及再分布实验,研究入渗压力对湿润峰前进速度、入渗率、土壤平均含水量、水分再分布过程中湿润峰前进速度及对干土层厚度的影响.研究结果表明：入渗阶段提高入渗压力增大了湿润峰前进速度、入渗率及平均含水量,其中对湿润峰前进速度和入渗率的影响主要表现在入渗初期;入渗压力对再分布过程湿润峰前进速度没有影响;入渗压力对垂直土柱干土层厚度没有影响;调节入渗压力是调节含水量大小及水分分布形态重要手段,适当地减小入渗压力能避免形成植物所不需要的高含水量区。     

大型室内游乐场人员疏散运动时间的模拟

针对大型室内游乐场人员疏散运动时间的问题,分析了游乐场人员构成、人员步速和肩宽及其分布与人员疏散运动时间的关系,采用Pathfinder模拟了该运动时间与其影响因素间的关系.模拟结果表明:对于特定的大型室内游乐场,在外界环境和人员密度不变的条件下,人员疏散运动时间随人员步速的增大而减少,随人员肩宽的增大而增大,随儿童比例的增大而增大;人员步速和肩宽均服从常值分布时的疏散运动时间最短,服从均匀分布时的疏散运动时间最长,服从正态分布时的疏散运动时间介于二者之间.     

刘光第与戊戌维新运动

刘光第作为一个士大夫,出于爱国的强烈愿望,致力于维新运动,并在政治,经济,化等方面提出了自己的主张。     

水下气泡群运动特性及其三维数值模拟研究

在对水下单气泡运动受力分析及任意时间剖面多气泡运动特性研究的基础上，建立了水下气泡群运动数学模型。提出了一种基于时间剖面的分析方法，通过改进的RKF方法对各时间剖面进行求解，获得水下气泡群三维运动特性，发现出口处各随机气泡在脱离后，在很短时间内铅垂方向速度均达到一定值但有较小波动，水平各向速度随即趋于0；从运动轨迹分析看，相邻气泡碰撞几率很小，聚集成大气泡的可能性不大。