Abstract: A ultrahydrophobic ZnO film was synthesized on the Si substrates by a novel vapor phase transport method. The surface structural properties of as-synthesized ZnO film was characterized using scanning electron micrograph (SEM). The contact angles and the rolling angles on such films were measured through an optical contact angle meter. Wettability studies revealed the films exhibited a ultrahydrophobic behaviour with a higher contact angle of 166.8°±6.8° and lower rolling angle of less than 2°-a water droplet moved easily on the surface. SEM showed that compared with pure smooth nickel surface, a lotus-like structrure with micro-nano hierarchical papillae was obviously observed on the ultrahydrophobic ZnO film surface. Such a speccial surface microstructure may result in the ultrahydrophobicity.
Abstract: Measurement of bullet data is very important to the target trial. The reliable signal acquisition and analysis is the bases of the design of weapon. When the ordinary photoelectric target work, firelight or ambient light will bring an error trigger signal or cannot capture the shot off target signal. These may affect accuracy and sensitivity of the system. A system of the data acquisition and process based on PCI local bus is introduced in this paper. The device of hardware and data acquisition base on PCI local bus is in detail. Introduce how to design the PCI driver. This system has been successfully used to measure several kinds of projectiles’ velocity.
Abstract: The equipment support system is a complex nonlinear system, which is of random, fuzzy and uncertain in characteristic. The equipment support system’s effectiveness was evaluated objectively and scientifically with fuzzy comprehensive evaluation (FCE) method in this paper, through qualitative analysis and quantitative analysis. Based on the result of the evaluation, the weak link is pointed out and it’s good to improve the quality of the equipment support system.
Abstract: At present, the extendible Web server clusters are the important framers for the high performance network servers. The architecture based on load balancer is often used on web server clusters. The load balancer is the main bottleneck in improving performance of cluster. For it is hard to complete the task of assigning the requests from the client while collecting the real load information of the web servers efficiently. In this paper, we propose a model of two levels load balancer for web cluster to resolve the contradiction. When web requests are arrive, the first-level balancer continuously assigned them by to the second-level which consist of some load balancers connect to real web servers and receive real-time load information of them. Round robin algorithm is used at the first-level load balancer to schedule the client’s requests in order to shorten the response time. The proposed algorithm in our model is run at the second-level load balancers to schedule the requests to real web servers according to the real load information. At last, a simple test is carried out to make sure the performance of the model. The result of the test shows that the model has made better load balancing.
Abstract: Development of data mining technology provides convenience for analyzing tobacco consumers’ act. Through simple introduction on contents and categories of data mining technology, the survey on tobacco consumption act of Shaoxin Tobacco Company is analyzed with association rules and data mining software Weka, and factors which affect tobacco consumption are mined on with association with Apriori Algorithm, so as to provide valuable references for brand spreading channels, product design, improvement of taste and flavor, package, price and other aspects for the tobacco company.
Abstract: Ceramic oxide coatings were prepared on an aluminum A356 alloy by a plasma electrolytic oxidation (PEO) technique under unipolar, bipolar and duplex unipolar/bipolar current modes. Cross-sectional morphologies of the coatings were studied using a scanning electron microscope (SEM). The corrosion behavior of the coated and uncoated samples was evaluated in ethanol-gasoline E85 fuels through potentiodynamic polarization and zero resistance ammeter (ZRA) testing methods. The results indicated that all the coatings had a better corrosion resistance compared to the uncoated substrate. The unipolar current mode created the PEO coating with a thicker coating microstructure and thus a better corrosion resistance, compared to a bipolar current mode. The duplex treatments of unipolar/bipolar or bipolar/unipolar current modes produced the best performance of the coatings against galvanic corrosions caused by a steel/Al coupling in the E85 fuel medium.