研磨条件下SbCl3促进的Meldrum’acid与芳香醛的缩合反应

研磨条件下,以SbCl3,为催化剂有效的促进了丙二酸亚异丙酯与芳香醛之间的Knovegenel缩合反应,与其它方法相比,主要优点在于反应条件温和,反应速度快,收率高,为Knovegenel缩合反应找到了一条有效途径.     

数字化时代的高校图书馆建筑

网络和数字技术给图书馆建筑带来巨大冲击,文章通过多年来学者对数字化时代的图书馆建筑实体的争论,分析了现代图书馆纸质文献将与数字型文献长期共存、实体图书馆与虚拟图书馆共同发展的趋势,重点阐述了现代图书馆建筑格局要适应信息环境的变化,处理好数字化技术与传统图书的关系,构建智能化的空间,强调现代图书馆建筑设计应体现先进性、人性化设计思想。     

一种新的高维数据聚类自适应算法的研究

聚类有效性是用来评估在不同输入条件下的聚类算法性能的处理过程.高维数据空间的稀疏性和"维灾"问题使得传统有效性指标失去作用.提出新的可用于高维数据集的有效性指标,并结合启发式递减算法,提出一种高维数据的自适应聚类算法,用于确定高维数据集的最佳聚类数目.实验结果表明:提出的聚类算法有较好的性能.     

Study on Echo Time-Delay Estimation of Pulsed Laser Fuze

Pulse laser range detector is to measure the distance by estimating the time delay between the emitting pulse and echo pulse.In this paper,a mathematical model for the target echo signal of laser fuze has been established;in accordance with this model,the formulas for echo time-delay estimation and for amplitude estimation based on least squares criterion have been deduced.It is argued and simulated that the resolution of echo time-delay estimation could be improved through multi-reference correlation appro...     

Catalysis of Active Carbon Supporting Transition Metal Oxides for Pyrotechnical Reagent with Potassium Perchlorate

In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides (TMO),Fe2O3 and CuO,were prepared and added into pyrotechnical reagent with potassium perchlorate.Accelerating rate calorimeter (ARC) was used to study the catalysis of pyrotechnical reagent which is consisted of potassium perchlorate and composite catalyst.Composite catalyst of both Fe2O3 and CuO supported by active carbon can catalyze pyrotechnical reagent with potassium perchlorate.Furthermore,it can lower the apparent activation energy and accelerate the reaction with a smaller quantity than that with Fe2O3 and CuO.The maximal reaction rate of pyrotechnical reagent with potassium perchlorate mixed with Fe2O3/active carbon and CuO/active carbon is 8.31 min-1 and 9.13 min-1,which is 1.74 times and 1.91 times of pyrotechnical reagent mixed with no catalyst;time to maximal rate was 18.99 min and 1.96 min respectively,which is lower than pyrotechnical reagent mixed with no catalyst by 86.46% and 98.67% ;the apparent activation energy is 368.10 kJ·mol-1 and 325.29 kJ·mol-1,which is lower than pyrotechnical reagent mixed with no catalyst by 31.89% and 39.81% respectively.     

碱金属在烧结过程中的行为规律

高炉碱害频繁出现,影响日益严重,人们对它的关注与日俱增.烧结矿带入的有害元素在高炉中占的比重最大.本文对烧结矿及原料进行现场取样,重点对烧结矿碱金属进行平衡计算,提出降低碱害的方法.实验表明烧结原料中的K经过烧结工序之后,89%的进入了烧结矿,仅11%的有害元素进入粉尘;铁矿石和溶剂中的有害元素Na,近乎100%的进入烧结矿.     

红土镍矿干燥焙烧工艺条件选择研究

以红土镍矿为原料,用热重分析(TG)和X射线衍射分析(XRD)等方法,对红土铁矿干燥焙烧条件进行研究.结果表明,在矿石粒度为0~3 mm且小于180目颗粒占25%,配焦粉量8%,焙烧温度850℃,焙烧时间90 min,干燥焙烧效果最佳.     

采油菌株的分离及其特性研究

从采油菌剂及原油中共分离出11株细菌,并对其发酵特性和生理生化特性进行研究。结果表明,分离菌株可以利用石蜡产表面活性物质,但不产气;菌株发酵液的pH值没有明显的变化,对原油有不同程度的乳化作用;Y-1和Y-5为芽孢杆菌属(Bacillus),Y-2和Y-6为节杆菌属(Arthrobacter),Y-3为棒杆菌属(Corynebacterium),Y-4、J-1、J-2、J-4、J-5和J-6为不动杆菌属(Acinetobacter)。大多数分离菌株为兼性厌氧菌,具有运动性,不产生硫化氢,能够利用蔗糖、葡萄糖等廉价碳源产生有机酸和气体,这些特性有利于菌株应用于微生物采油。     

Denitrifying phosphorous removal in anaerobic/anoxic SBR system with different startup operation mode

To achieve stable and efficient nitrogen and phosphorus removal and to investigate the characteristics of the A/A SBR enriched with denitrifying phosphorus removal bacteria(DPB),the whole course of startup was studied with two reactors operated in different mode.The reactor I was operated under anaerobic/settling/anoxic/settling mode,and the reactor II was operated under anaerobic/anoxic/settling mode.Differences between the two reactors in removal efficiency of COD,nitrogen and phosphorus were examined.The results indicated that efficient performance could be achieved in both reactors with different startup operation mode,while the phosphorus removal efficiency was improved sooner in reactor I than in reactor II,which suggested that reactor I would supply a more favorable condition for DPB proliferation.Meanwhile,it was observed that the amount of organic substrates consumption had a linear correlation to that of phosphorus release in anaerobic phase when DPB was accumulated in the A/A SBR denitrifying phosphorus removal system.     

基于TCN的地铁列车控制方案的研究

本文针对地铁车厢内控制设备分散的问题,设计了基于TCNRTP的地铁列车控制网络系统。采用NS2网络模拟软件构建的虚拟网络环境,编写消息数据传输层协议,通过测试列控网络的通信效率,得出了影响通信效率的因素;通过配置列控通信设备的基本功能和设定装置运行参数达到配置网络化通信的目的。