The rough representation and measurement of quotient structure in algebraic quotient space model

Granular computing is a very hot research field in recent years.In our previous work an alge-braic quotient space model was proposed, where the quotient structure could not be deduced if the granulation was based on an equivalence relation.In this paper, definitions were given and formulas of the lower quotient congruence and upper quotient congruence were calculated to roughly represent the quotient structure.Then the accuracy and roughness were defined to measure the quotient struc-ture in quantification.Finally, a numerical example was given to demonstrate that the rough repre-sentation and measuring methods are efficient and applicable.The work has greatly enriched the al-gebraic quotient space model and granular computing theory.     

异构无线网络负载超前转移的负载均衡技术研究

文章分析了以多属性决策理论中简单加权算法(SAW)为代表的普通切换算法负载对比呼叫到达率(CAR)滞后的特性,针对异构无线网络垂直切换负载滞后造成负载不均衡现象,首先,建立异构无线网络,使用时间序列建立(SARIMA)模型预测网络呼叫到达率,根据预测呼叫到达率,引导业务切换和超前转移业务带宽,形成改进的(TSAW)算法,仿真结果表明TSAW算法克服了SAW算法负载滞后特性,使网络负载均衡特性变好.     

Identification of auxin responsive genes in Arabidopsis by cDNA array

The plant hormone auxin influences a variety of developmental and physiological processes. But the mechanism of its action is quite unclear. In order to identify and analyze the expression of auxin responsive genes, a cDNA array approach was used to screen for genes with altered expression from Arabidopsis suspension culture after IAA treatment and was identified 50 differentially expressed genes from 13824 cDNA clones. These genes were related to signal transduction, stress responses, senescence, photosynthesis, protein biosynthesis and transportation. The results provide the molecular evidence that auxin influences a variety of physiological processes and pave a way for further investigation of the mechanism of auxin action. Furthermore,we found that the expression of a ClpC (regulation subunit of Clp protease) was repressed by exogenous auxin, but increased in dark-induced senescing leaves. This suggests that ClpC may be a senescence-associated gene and can be regulated by auxin.     

随机锤击法识别专用车架结构模态参数

结构动态试验中,用锤击法识别结构模态参数,近几年来已被广泛应用,通常锤击法激振能量有限,测得激励和响应数据信噪比甚低,影响模态参数识别的成败。本文提出用一种随机锤击法识别结构模态参数,它能将更多能量输入结构,提高了数据的信噪比,加快了试验速度。本文结合具体数据作出了论证。在4 t重复杂汽车吊专用车架上仅用280g重的小力锤,满意地获得了结构模态参数,并且与一般锤击法试验作了对比分析。     

The dual effects of ethylene on the negative gravicurvature of arabidopsis inflorescence, an intriguing action model for the plant hormone ethylene

Ethylene was found to alter the shoot gravitropic response a century ago. However, its actual effects remained controversial over the century. In the present study, we investigated the effects of ethylene on the gravitropic response of Arabidopsis inflorescence and discovered that although the intact Arabidopsis inflorescence bent upward at the rate of 43°±3°/h in the first 1.5 h under the given control growth conditions, it bent upward at a rate of 20°±3° and 64°±14°/h in the presence of exogenous ethylene if the plants were pretreated for 0.5 and 12 h, respectively, before the initiation of gravistimulation. The increase in gravicurvature rate is proportional to the length of ethylene pretreatment. The minimum ethylene pretreatment time required for achieving the maximum curvature rate is 10—11 h with removal of exogenous ethylene. The stimulatory effect of ethylene on the inflorescence gravicurvature requires a latent period of time (1 h) to become measurable. In contrast, the inhibitory effect of ethylene becomes measurable shortly after application of ethylene. The stimulatory effect remained nearly unchanged when the applied ethylene concentration increased from 0.1 to 10 ml/L. However, the inhibitory effect increased substantially as ethylene concentration increased to 10 mL/L. These results suggest that ethylene simultaneously exerts both stimulatory and inhibitory effects on the gravitropic response of the inflorescence, and the stimulatory effect dominates over the inhibitory effect during the interplay between the two in the inflorescence. A “Yin and Yang” action model is hereby proposed to address the interplay between the two effects of ethylene. They may act through distinct signaling pathways.     

计及不平衡电压机会约束的单相-三相光伏并网准入容量优化模型

单相住宅式光伏发电主要接入台区电网,单相光伏、电网及负荷的不对称都会引起显著的电网不平衡电压,影响电网和负荷正常工作。考虑单相、三相光伏和负荷的相关性和不确定性,研究三相系统中计及光伏-负荷相关性的随机抽样方法,然后以光伏发电并网准入容量最大为目标,构建三相电压不平衡的机会约束,并在电网功率平衡约束的基础上,建立考虑光伏-负荷相关性的并网准入容量的概率优化模型,再用蒙特卡洛模拟和免疫遗传算法对模型进行求解。通过某实际380 V台区电网的光伏发电准入容量分析验证方法的有效性。     

Control of tillering in rice

Tillering in rice (Oryza sativa L.) is an important agronomic trait for grain production, and also a model system for the study of branching in monocotyledonous plants. Rice tiller is a specialized grain-bearing branch that is formed on the unelongated basal internode and grows independently of the mother stem (culm) by means of its own adventitious roots. Rice tillering occurs in a two-stage process: the formation of an axillary bud at each leaf axil and its subsequent outgrowth. Although the morphology and histology and some mutants of rice tillering have been well described, the molecular mechanism of rice tillering remains to be elucidated. Here we report the isolation and characterization of MONOCULM 1 (MOC1), a gene that is important in the control of rice tillering. The moc1 mutant plants have only a main culm without any tillers owing to a defect in the formation of tiller buds. MOC1 encodes a putative GRAS family nuclear protein that is expressed mainly in the axillary buds and functions to initiate axillary buds and to promote their outgrowth.     

旋转直接驱动电液压力伺服阀稳定性分析

针对最新研制的旋转直接驱动电液压力伺服阀(RDDPV)出现输出压力振荡问题,建立了数学模型和简化框图,得到了RDDPV稳定性判据,并提出了解决方案.RDDPV取消了传统压力伺服阀的机械和液压反馈,采用马达转角内闭环和输出压力外闭环的电反馈伺服控制.研究表明,当阀芯处于进回油口中间位置附近,稳态液动力表现为阀芯位移的正反馈作用,导致整阀机械液压部分刚度为负,稳定性差,此时,马达转角内闭环电反馈刚度对整阀稳定性至关重要.数值模拟和试验表明,增加马达转角电反馈系数,增加了伺服阀电反馈刚度,提高了伺服阀的稳定性.     

基于uIP协议的生产设备数据采集系统设计

针对半导体封装企业生产设备种类繁多、数量庞大且分布范围广等特点,设计了一种基于uIP协议的生产设备数据采集系统。该系统的数据采集与传输不受采集终端数量、分布区域以及传输距离限制,客户端通过浏览器可实时在线准确地监视车间所有生产设备的运行状态,免去不必要的人工监视工作量。运行结果表明,该数据采集系统能很好地满足半导体封装企业对生产设备进行监控的要求。     

基于ZigBee的无线网络通用数据传输系统设计研究

在ZigBee通信协议的基础上,设计了一种短距离的无线通用数据传输系统。本设计以TI公司的CC2538为硬件平台,利用ZigBee协议栈组建网络实现了无线数据传输。实验证明:该通信系统性能良好,数据传输可靠,具有通用性。