Cloud computing is the most anticipated revolution in the computer field. It has the ability to distribute the resource dynamically. According to the needs of the client service, with the lowest cost to solve the computer information processing, it creates hope for the computer technology innovation. But cloud computing has certain vulnerabilities for privacy in the network environment. Because the resource is allocated dynamically, privacy information is easy to be stolen. This paper improves MB-Tree model, gives the ability of protecting customer privacy information dynamically, and establishes the mathematical model and algorithm of dynamic MB-Tree. In order to verify the algorithm, finally we verify the algorithm of MB-Tree model, in which dynamic protection effect of privacy information with different time is up to 98%, protection effect of different data is up to 96%. The privacy information of cloud computing is got better protecting effect.

The effects of slow and rapid cooling methods on the postharvest physiology of Yali pears during ice temperature (-0.5°C) storage were investigated. Respiration rate, ethylene production, browning index and polyphenol oxidase(PPO) activity were used to evaluate the quality of Yali pears. The results showed that the slow cooling treatment decreased the levels of respiration rate，ethylene production，and PPO activity of Yali pears, and delayed the occurrence of the respiration, ethylene, and PPO activity peak compared to the rapid cooling treatment. The browning indexes of Yali pears with slow cooling treatment were lower than that of rapid cooling treatment. The results indicate that the cooling method may be an important factor affecting the storage quality of Yali pears. The slow cooling can delay the occurrence of physiological disorder during ice temperature storage.

No abstract

The electrochemical deposition of thiophene and CdSe on TiO2/ITO by cyclic voltammetry(CV) technique was carried out to study the influence of conditions on the preparation and photophysical performance of poly(thiophene) (PTh)/CdSe double layers electrode. The chemical structure of the obtained polymer was characterized by FT-IR, Raman, X-ray diffraction, UV-vis spectroscopy. The morphology was observed by electronic scanning microscope (SEM) which showed nano-grain shape. Finally the photovoltaic performance of the solar cell which was composed of PTh/CdSe/TiO2 composite film used as working electrode, Pt used as counter electrode was investigated. And mechanism of photogenerated electron of PTh/CdSe electrode was proposed. The results showed that TiO2electrode modified by PTh/CdSe composite film had good response on irradiation, which indicated the PTh/CdSe was promising dye in solar cell.

With the widely applied computer control system, especially the distributed control system, the complexity of control software is becoming higher and higher, and the quality of the software directly affects the reliability of control system. This paper develops a new traceability system for food processing by using VB programming software and CMM computer software testing technology, and sets up the quality traceability control model of food processing, which realizes the optimal allocation between the raw material batch and the order. Quality traceability system for CMM food processing designed in the third section is verified. The traceability of the quality in the process of food processing can adjust the process of food processing, so as to obtain new quality curve, and to provide a theoretical basis for the research on the quality control of food processing.