Search

Development of aerospace technology is inseparable from the excellent performances of guidance system. It often tests performances of guidance system on simulator in engineering. It can be drawn that coupling effect among the rotary axes in simulator is present by analyzing mathematical models of simulator. Currently, experimental study carried out for the conclusion about coupling effect among the rotary axes is a few. Therefore, experimental study about coupling effect among the axes at the time of simulator linkage is carried out to determine the existence of such a coupling effect and observe its impact.

The method of the traditional workflow design and the skill standards hadn’t been in meeting its demands according to the characteristic of Multi-variety and small-batch processing. The operator workflow analyses were divided into three parts to be discussed in this paper as a common content workflow, character content workflow and temporary content workflow. The general content workflow was optimized by using the classics work study method and choosing the scene team on the other two modules. A new analysis method which took crombag skill defines as the indication basis, was established for the operator workflows, and considering the essential factor as the analysis objects. The designed new module type workflows were divided the work contents of the standard into the Multi-variety and small-batch processing, which promoted the post work ordering and highly effective. Its characteristic of the rationale and the objective basis reduces the ingredients, and provides the operator training and recruitment.

Desalination of seawater has played an important role in many arid regions in the world. There are many methods for desalination of seawater, such as MED, MSF, RO, ED, TVC, and MVC, etc. Different methods have different advantages and disadvantages. In the present work, a new method for desalination of seawater with steam-ejector refrigeration plant was introduced. The main purpose of the new method is a hybrid plant of TVC and steam-ejector refrigeration. In the hybrid circle, no other energy was need. When the steam-ejector refrigeration plant is working, the seawater as cooling water is introduced into evaporator of TVC and evaporates. The vapor getting in TVC is extracted by a second steam-ejector, together with the active steam, is used as source of heat for desalination. The main advantage of this hybrid plant is that part of the heat energy of cooling water in refrigeration is reused. Comparing with other distillation method desalination of seawater, the energy consumption is much less. Especially on marine usage, the advantage is clear.

Few studies have been done on temporal changes of heavy metal pollution of urban soils. Eight soil samples at the same sites were collected inKaifengCity, China, in1994and 2006. Concentrations of Pb, Cd, As and Hg in the samples was measured. The pollution change of heavy metals from 1994 to 2006, and the relations between metal pollution and some human factors were discussed. The results show that soil pollution with metals in 2006 was higher than that in 1994 with economic growth. Soils in industrial district (ID) were more strongly polluted than in the following districts: (i) cultural and educational district (CED), (ii) mixed district of resident-commerce-administration (RCD), (iii) recreational district (RD), and (iv) suburban district (SD). Cd and Hg were the dominant pollutants. Economic growth, changes of land use and land-use authority can influence soil metal pollution significantly.

The amorphous alloy application is limited because of its brittleness property. Based on the grain structural characteristics of nanocrystal alloys, the mechanical behavior of the amorphous/nanocrystal Ni-Mo23.56alloy is investigated in this text. The microstructure of the deposit and the crack propagation were discussed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results show that amorphous/nanocrystal Ni-Mo23.56alloy has a higher microhardness, a strong binding force between a certain thickness coating with the substrate. The tensile stress-strain pattern shows a certain degree of plastic deformation behavior in the coating and tensile fracture surface of radial vein structure, in line with the free volume fracture model.

The present work describes the upgrade of one type seawater reverse osmosis (SWRO) unit by Work-Exchanger Energy-Recovery (WEER) system to increace the product flowrate. Before the upgrade, the unit operated at a capacity of 120t/d, and a specific electricity of 7.4kWh/m3. Tests conducted on the unit after the upgrade, when the plant operated at essentially the same pressure conditions, the capacity increase to 150t/d, and a 67.6% reduction in specific electricity to 2.4kWh/m3. This confirmed that the reduction in specific electricity was due to the WEER system. The operating experience with the plant of the first month is presented.