乳胶漆实用技术讲座：聚合物乳液检测方法

乳胶漆实用技术讲座：聚合物乳液检测方法朱传（北京东方化工厂）Ｔｈｅｔｅｓｔｍｅｔｈｏｄｓｆｏｒｉｎｓｐｅｃｔｉｎｇｔｈｅｑｕａｌｉｔｙｏｆｔｈｅｐｏｌｙｍｅｒｅｍｕｌｓｉｏｎｓ￥ＺｈｕＣｈｕａｎ－ｑｉＡｂｓｔｒａｃｔ：Ａｐａｒｔｏｆｔｈｅｓｙｓｔｅｍ...     

Pruning Redundant Alarm Correlation Patterns

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｔｉｃｋｉｎｇｐｏｉｎｔｏｆａｓｓｏｃｉａｔｉｏｎｒｕｌｅａｌｇｏｒｉｔｈｍｓｄｅｐｅｎｄｓｏｎｅｆｆｅｃｔｉｖｅｌｙｆｉｎｄｉｎｇａｌｌｃｏｒｒｅｌａｔｉｏｎｐａｔｔｅｒｎｓｔｈａｔｓａｔｉｓｆｙｖａｌｕｅｒｅｑｕｉｒｅｍｅｎｔｉｎｔｈｅｍａｇｎａｎｉｍｉｔｙｏｆｄａｔａ.Ｂｕｔｔｈｅａｌｇｏｒｉｔｈｍｓａｌｓｏｂｒｉｎｇａｎｅｇａｔｉｖｅｅｆ ｆｅｃｔ:ｔｈｅｎｕｍｂｅｒｏｆａｓｓｏｃｉａｔｉｏｎｒｕｌｅｓｉｓｖｅｒｙｌａｒｇｅ.Ａｌｓｏｉｎｆｏｒｍａｔｉｏｎ…     

Pilot Based Channel Estimation in IEEE 802 16a OFDM System

1　Introdution　IEEE 802 16[1] is a specification for fixed broadbandwireless Metropolitan Access Networks (MAN). The stan dard is expected to bring low cost and more bandwidth prod ucts for broadband wireless access in the next years. Thisstandard specifies the physical (PHY) and Medium AccessControl layer (MAC) of the air interface of interoperablepoint to multipoint and optional Mesh topology broadbandwireless access system. The specification enables access todata, …     

The Research of ST-OFDM in Physical Layer of IEEE 802.16a

This paper briefly introduces one of the three physical layer implementations of IEEE 802.16a~[1],WirelessMAN-OFDM PHY.Based on the implementation,the combination of Orthogonal Frequency Division Multiplexing(OFDM)and Space-Time Coding(STC)which is briefly called ST-OFDM in IEEE 802.16a,is investigated under thechannel provided in Ref.[2].Especially,this paper is focused on the influence of the optimal decision threshold on the sys-tern Bit-Error-Rate(BER)performance based on unequal probabilities of sources.The simulations show that when Signal-Noise-Ratio(SNR)is low the optimal decision threshold is obviously superior to the usual one;when SNR is high to someextent,such as 10 dB for 4QAM and 16 dB for 16QAM,we can use the usual decision threshold instead of the optimal     

全方位开拓丙烯酸系列涂料──推广水性金属维护涂料

丙烯酸树脂漆是继醇酸树脂漆之后的又一类具有通用性能的合成树脂涂料。对丙烯酸树脂漆的这种定位，早有共识。丙烯酸树脂漆有那么多各不相同的品种，各类品种又表现出那么优异的性能，正是在这个基础上，早在二、三十年前，国外就有人断言，有朝一日，丙烯酸树脂漆将会超越醇酸而在产量上居合成树脂涂料的首位。这种预言，虽然迄今未成事实，但在此期间，丙烯酸树脂漆确也取得了长足的进展。在发达国家中，丙烯酸树脂漆的产量已稳居合成树脂涂料的第二位；其应用得到了全方位的普及，在某些方面，其应用还有了超越于醇酸的延伸。所谓全方位…     

PREPARATION OF TEM THIN FOIL CONTAINING POWDER PARTICLE BY ELECTRODEPOSITION METHOD

A practical technique to prepare transmission electron microscopy （TEM） thin foil containing powder particle was described and the data for the codeposition of two type particles with copper in the electroplating were presented. By depositing the particles which were distributed in CuSO4 electrolyte on cathode together with Cu^2＋ in electrodeposition bath, composite coating with suitable thickness could be formed. The thin coating was separated from the substrate and cut into a disc with diameter of 3mm for electropolishing. When the Cu matrix was thinned during electropolishing, the particles contained in the coating plate were also thinned to meet the suitable thickness for TEM observation. Various experimental results revealed that during electrodepositing the current density, pH-value of electrolyte and stirring mode all have significant effects on the distribution of particles in composite coating and the surface quality of the composite coating. The proper parameters used during electrodepositing to prepare TEM thin foil containing powder particle were discussed.     

Exploration of Linked Anomalies in Sensor Data for Suspicious Behavior Detection

We present a visual analytics system to understand the operation data of a company, GAStech, from IEEE VAST Challenge 2016. The data include proximity data recording the locations and movements of employees, and heating, ventilation, and air conditioning (HVAC) data recording the environmental conditions in the building. Analyzing the data to detect the suspicious behaviors of some disgruntled employees is of special interest. Our system provides coordinated multiple views to visualize the proximity data and the HVAC data over time. Visual hints and comparisons are designed for users to identify abnormal patterns and compare them. Furthermore, the system automatically detects and correlates the anomalies in the data. We provide use cases to demonstrate the effectiveness of our system.     

乳胶漆粘结剂（续一）

乳胶漆粘结剂（续一）朱传　（北京东方化工厂）Ｔｈｅｂｉｎｄｅｒｓｆｏｒｌａｔｅｘｐａｉｎｔ￥ＺｈｕＣｈｕａｎ－ｑｉＡｂｓｔｒａｃｔ：Ｔｈｉｓｉｓｔｈｅｓｅｃｏｎｄｐａｒｔｏｆａｎａｒｔｉｃｌｅｗｉｔｈａｎａｉｍｔｏｐｏｐｕｌａｒｉｚｅｔｈｅｋｎｏｗｌ...     

Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion

The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH...     

建筑涂料水性化谁主沉浮

介绍建筑涂料水性化。从五十年代至今发展的必然性和存在的优势是显而易见。但其产品品种单一，质量不尽人意，其中存在一哄而上，技术实力不一等问题，而在我们涂料工业中却未能引起重视。建筑涂料水性化既为发展方向，必由我们涂料工业担当此任，为未来发展应发挥主力军作用。