Search

Along with the speeding up of urbanization and the improvement of people's quality of life, city garbage as a core part of the city sanitation engineering in recent years, more and more get the attention of the government. In our country, kitchen waste as part of the city garbage, the manufacturing quantity more and more. Science of processing the rubbish can not only protect the environment and people's health, but also for resources to use again. Through the survey of domestic processing of kitchen waste, put forward the domestic city for reasonable deal with the necessity of kitchen waste.

Ethanol is a kind of basic biomass liquid energy , the conversion of biomass to ethanol has been studied extensively. The process of biomass pretreatment can change its physical and chemical properties, and these changes affect the chemical conversion of biomass products in quality and yield of late. This paper reviews the physical method, chemical method, biological method, three kinds of pretreatment technique, the related principle and development prospects are introduced.

The use of steam steam ejector is formed in a Laval nozzle entrained flow speed airflow to the power unit of the body, has a simple structure, easy maintenance, stable and reliable, pumping capacity, etc.which is widely used in metallurgy, chemical, pharmaceutical , food and other industries. Based on the comprehensive domestic steam jet pump theory and design based on the results of its variety of design methods reviewed, and in accordance with design features and compare their design processes, raise steam jet pump design trends.

To solve the problem of how to evaluate coal floor multi-aquifer which is under complex hydro-geological conditions, a new approach is presented, which is AHP vulnerability index method based on GIS. In the research the main controlling factors influencing coal floor water inrush and its weight factors are taken into account. The method truly reflects the nonlinear dynamical process of coal floor inrush under the influence of many factors. Applying this method to evaluate the water inrush vulnerability of No.13091 working face No. 21coal floor aquifer in L1-3limestone and Ordovician - Cambrian limestone in Pingyu 1st coal mine, the results have showed that this method is more effective comparing with other traditional water inrush coefficient methods. The problem of indicating coal floor water inrush under complex hydro-geological conditions has been solved by using this method.

Building palisade structure is the most important part of the wall, so the external wall thermal insulation technology has become an important part of building energy efficiency. After the author found the domestic use of insulation materials in a variety of forms, different use method makes the external wall thermal insulation system has a problem. The analysis of the cause of the problem at the same time, this paper discusses how to use of selected materials and improving the construction methods to avoid the happening of the accident.

The quality of two synthetic quartz crystals, Z lump and Y bar, was researched by the infrared spectrophotometer technology and chemical spectral analysis in this study. The relationships between typical impurity OH and other impurities such as Fe, CO and Mg were discussed which impacted the quality of artificial rock crystal; the defects in artificial rock crystal and crystals, such as lattice dislocation and distortion with a close relation appear at the same time and impact the quality of synthetic quartz. The work in future should begin from the following two aspects in order to improve synthetic quartz crystal quality: the one is to further study the crystal structure characteristics and to explore the cutting type of crystal with convenient cultivation and processing process, high use ratio and high Q value. For example, the research is to make the Z area of Y bar crystals bigger and the other areas smaller or disappear. The other one is to improve the existing technological level and to reduce defects.

Aiming at importance of atmospheric transport model in the collectivity design of ground target observation remote sensor, based on analysis of PcModtran application feasibility, amend geometrical model of remote sensor design is presented, then discussed the calculation of PcModtran for energy transmittivity of all kinds of pollutants atmospheric in detect path, all kinds of radiance in entrance pupil radiance of remote sensor by emulation instance, probed into the method that applying PcModtran filtering function analyze photoelectrons number of radiance on the focal face of detector, foundation that verify collectivity design index of satelliteborne optical remote sensor is presented. Successful application in some type secondary satellite, it verified the method is of guidance function on the collectivity design.

Advanced flighter has many control surfaces.Because that reconfiguration technique can be used to retain a sufficient level of flying quality to enable a surface failure aircraft to safety.At the same time the control efficiency change.The estimate algorithm is used to evaluate the control efficency.

Due to the complex working and storage environment for airplanes, the consumptive failures of airborne products are unavoidable. Aiming at the problem that degradation behaviors that cause this kind of failures are frequently neglected, based on the concept of degradation for airborne products, a new method of conducting research that treats aging process as a critical degradation behavior is presented. According to the characteristics of airborne mechano-electronic products, steering engine is defined as a critical airplane airborne mechano-electronic product. Through detailed analysis of the vulnerable area of steering engine, the failure mechanism of aging of steering engine rubber seal is discussed. The degradation model of steering engine rubber seal is presented. Finally, feasibility of the method that replaces the research of degradation behavior of the airborne mechano-electronic products with that of aging is verified.

The paper proposes a novel method of improving the traditional composite grating in 3-D measurement of the specular objects. The traditional composite grating is improved by altering the intensity of the center stripe in one of the fringes. The improved composite grating not only includes the primary phase information, which is modulated by the object's surface, but also includes the code information, which is necessary for the phase unwrapping. The paper introduces the formation of the improved composite grating, demodulating the composite grating and computing the unwrapped phase based on the altered fringe. Simulated and actual experiments prove that this method is valid. Because of projecting a single composite grating, the method is suitable for dynamical measurement.

Fault tolerant control can improve the safety of aircraft under control surface failures. Sometime the redundancy method losses its effectiveness when the actuator is impaired severely. Under this condition the fault tolerant method can not be used to compensate failures. The paper proposes a method to find the bound by analysis and computer by moment for fault tolerant control. And give the effect on control allocation. At last the fault tolerant bound is added to control allocation as one of limit conditions.

Uniform design was used to prepare and optimize the cement-based capillary crystalline water- proofing coating. Also the experimental data were analysized by DPS software and the optimization of coating formulations were obtained as follows: content of Ⅰwas 1.06%, content of Ⅱwas 0.57%, content of Ⅲ was 4.7%, content of Ⅳ was 1.36%, content of Ⅴwas 0.24%.

Energy performance contracting plays a key role in improving the building energy-efficiency in China. This paper introduces the current situation of energy-efficiency of large-scale public building in China and provides an overview of energy performance contracting, and then puts forward an innovative energy-efficiency running mode. This paper tries to offer theoretical references for the development of EMC in energy-saving field of large-scale public buildings.

With the development and popularization of the Internet ,a number of web sites based on Web Server Language and back-end database schema have occurred,and their security becomes more severe.Aiming at the security problems of websites, this paper introduces the attack method--SQL injection,which has the maximum harmfulness to websites,also briefly presents the principle and process of SQL injection, in addition, elaborates and analyzes the detection methods and defensive measures of SQL Injection vulnerability in detail.

Mesoporous silica SBA-15 has been prepared rapidly under normal pressure by microwave irradiation method. The textural properties were studied by low-angle X-ray diffraction (XRD) and nitrogen adsorption-desorption. The optimum adsorption conditions of Pb(Ⅱ) on SBA-15 was investigated. The results show that the adsorption kinetics follows a pseudo-second-order rate model and the experimental equilibrium data is fitted well by Langmuir adsorption isotherm. The adsorption capacity reaches 50.10 mg•g-1 which is much higher than that of hydrothermal synthesized samples. This adsorbent has been applied in the determination of Pb(Ⅱ) in river sediments samples.