Search

A new model of the refrigerator with refrigeration and constant temperature and hot water has been trial-produced. The new refrigerator can not only keep refrigerated food quality, but also be used for heating or keeping food temperature constant, and supply hot water for us. The subsystems of condenser have been analyzed and designed including air-cooled method and water-cooled method. According to the theoretical calculation, the temperature in constant temperature box can keep about 50°C and 18.46 Kg hot water can be provided per hour.

The non-logistics factors are very important the same as the logistics factors are to affect the decision-making of the enterprise workshop process layout. A large of typical non-logistics factors were analyzed and summarized after query and study of information and sites about workshop process layout. Then the non-logistics evaluation index system and evaluation standard were proposed. The weights of non-logistics indicators were determined by AHP. According to SLP, the non-logistics evaluating of layout project was carried out. The result should be supplied as the scientific basis for the layout decision. The example was presented.

Ti (C,N)/ZrO2/WC nanocomposite cermet die materials were fabricated by vacuum hot pressing process, the materials have better comprehensive mechanical properties. The friction and wear properties of Ti (C,N)-based nanocomposite cermet die materials were studied, and the worn surfaces microstructure were observed and analysed by SEM and XRD. The experimental results showed that when the rotate speed was higher, the coefficient of friction of the developed cermet die material, which is 0.3-0.4, was lower than that without the addition of nanoZrO2 and micrometer WC. The main wear mechanisms were abrasive wear, oxidation wear and adhesive wear.

Through the studying of heavy mineral assemblages and ZTR index variation features, this paper analyses the provenances and sedimentary systems of Saertu reservoir in Cretaceous of Jiangqiao-Pingyang area, western slope zone in northern of Songliao basin. It is concluded that there are three major sedimentary systems in the Saertu reservoir depositional period, named the Nehe-Yian sedimentary system in Northeast, Yingtai sedimentary system in Southwest, Qiqihaer sedimentary system in Northwest. The intensity and influence scope of the sedimentary systems in sedimentary period of SaII+III, SaIand Sa 0 reservoir changed. During the sedimentary period of SaII+III reservoir, research area is mainly controlled by the Qiqihaer and Yingtai sedimentary systems, the control action of Nehe-Yian sedimentary system in the research area is faint. During the sedimentary period of SaIreservoir, Nehe-Yian sedimentary system control the sedimentation of mainly region in research area, the control range of Qiqihaer sedimentary system has shrunk to the West of Jiangqiao area, the Yingtai sedimentary system dropped out of the research area. During the sedimentary period of Sa 0 reservoir, the control action of each sedimentary system basically inherited the distribution pattern of the sedimentary period of SaIreservoir, but the source supply capacity weakened further.

Green road design concept is a design concept of road engineering design,which is in order to harmonize the human, motor vehicle, road and their surrounding environments, which is a comprehensive design concept of moderation, coordination and mutualism. That is said the devotion in environmental protection and landscape should also be enlarged, in addition to satisfying the road usage technique condition in the road engineering design. The road engineering design should not only satisfy a safety, fast and convenient function of the road, but also should keep an environmental protection, beauty, flowing freely of the landscape design. These will not only create an keeping vigilance and excitement beautiful work space for the drivers, but also can provide a fascinating, delightful feeling and an enjoyment of the beauty of the travel conditions and landscape for the visitors in the meantime. This is an inevitable request in promoting district economy virtuous cycle, and also is an important content of the highway design in future.

The development status of self-lubricating tool materials was reviewed in the present study, as well as the five basic types of self-lubricating tool and the current situation of nanometer materials in ceramic cutting tool. Based on these, the design idea of the functional gradient materials and nano-micro composite materials was introduced into the self-lubricating ceramic cutting tool materials, in order to develop new self-lubricating ceramic cutting tool materials with both good mechanical and frictional properties.

Taking a start-up separator of 600 MW supercritical boiler as the study object, analyse the stress field of it during the process of load pick-up with the three-dimensional finite element analysis method. In the analytical process, it has calculated the thermal stress, mechanical stress and the total stress of them, and analysed the change rules of them, so it provide the guidance of the production operation processes. The calculation results show that: the thermal stress of open pore on start-up separator exists obvious stress concentration phenomenon; The stress concentration of the total stress occurred in the oval long axis of cylinder body wall, where is the danger point of the start-up separator.

In this paper, the stress analysis of the superheater outlet header of a 600 MW supercritical boiler in peak load operation was investigated by carrying out a three-dimensional finite element(FE) analysis. The ANSYS software was adopted to analyze the distribution of the stress. The most dangerous point was given. And the laws of the thermal stress, the mechanical stress and the total stress at the point change with time were established.

Commercial silk habotai was dyed with phellodendron according to Chinese traditional dyeing method. After dyeing, the samples were quickly aged under ultraviolet lights in order to simulate the light fastness ageing of silk cultural relics during exhibition in museum. The results showed that discontinuous aging and continuous ageing resulted in different effects on the samples. High Performance Liquid Chromatography (HPLC) was used to analyze the changes happened under different aging treatments and to explain the reason of the poor light fastness of the silk fabrics dyed with phellodendron.

Based on the structure and characteristic of automotive refrigeration system and engine circulation cooling water system and exhausted waste heat system, combing the working principle of lithium bromide absorption refrigeration system, the authors used the automotive exhaust pipe and cooling water tank improved as the generator of the lithium bromide absorption refrigeration system, which might realize the objective using the lithium bromide absorption hot-cold water unit to replace the automobile air conditioning refrigeration and heating system and the automobile engine cooling system. The methods of the thermodynamics, the heat transfer, the hydrodynamics are used to do the computation of the thermodynamic and the heat transfer area of the lithium bromide absorption refrigeration system. The result shows that it makes good use of exhausted heat of engine circulation cooling water and exhausted waste and reduces the consumption of oil. And structure is simple and compact for small heat transfer area of the automotive exhaust pipe and cooling water tank improved.

In this study, ZTA powder is modified by SA with different concentrations (0wt%, 1wt%, 2wt%, 3wt%, 4wt%) for the purpose of improving its properties. The effects of SA on microstructure, particle size distribution and flowability of the ZTA powder are investigated by scanning electron microscope(SEM), laser diffraction analyzer and self-made testing device of the angle of repose. After treatment, the average diameter of the powder decreases, the powder shows better dispersibility and flowability especially when the content of SA is 3wt%. FTIR spectroscopy is employed to evaluate the effect of SA coating on ZTA powder. The results indicate that a covalent bond is formed by the reaction between the hydroxyl group of ZTA surface and carboxyl group of stearic acid. Moreover, the changing of the polarity of ZTA powder can result in a stable dispersion in organic solvents.

Head Mounted Display (HMD) has been widely used in the area of wearable computing, augmented/virtual reality etc. The different image sources and optical subsystems of HMDs result in the diverse comprehensive display properties and optical properties. The traditional method to evaluate a HMD is modular transfer function. It requires special instruments, software and professional backgrounds knowledge, and thus leads to the lack of usability when it applied by common users. On the basis of human transfer function and Fitts’ model, in this paper we proposed an evaluation method, which has the advantage of easy applying. We evaluated this method targeting at a commercial HMD and a custom HMD, and the result shows that our method has a high usability.

Tracking and registration of camera and object is one of the most important issues in Augmented Reality (AR) systems. Markerless visual tracking technologies with image feature are used in many AR applications. Feature point based neural network image matching method has attracted considerable attention in recent years. This paper proposes an approach to feature point correspondence of image sequence based on transient chaotic neural networks. Rotation and scale invariant features are extracted from images firstly, and then transient chaotic neural network is used to perform global feature matching and perform the initialization phase of the tracking. Experimental results demonstrate the efficiency and the effectiveness of the proposed method.

In this paper, back propagation neural network was used in the optimum design of the hot pressing parameters of an advanced ZrO2/TiB2/Al2O3 nanocomposite ceramic tool and die material. The BP algorithm could set up the relationship well between the hot pressing parameters and mechanical property of nanocomposite ceramic tool and die materials. After analyzed the predicted results, the best predicted results were the sintering temperature was 1420°C and the holding time was 60min. Under these hot pressing parameters, the best flexural strength and the best fracture toughness of the material could be obtained.

A new ZrO2 nano-composite ceramic tool and die material was prepared with vacuum hot pressing technique. The effects of sintering parameters on the nano-composite ceramic tool and die materials were studied. The results indicated that the mechanical properties of ZrO2 nano-composite ceramic tool and die material with the additions of TiB2 and Al2O3 are higher than that of the pure ZrO2 ceramic material. Sintering at 1100 for 120min could improve the density and mechanical properties of ZrO2 nano-composite ceramic material. The flexural strength, fracture toughness and hardness with the optimum sintering parameters can reach 878MPa, 9.54MPa•m1/2 and 13.48GPa, respectively, obviously higher than that with non-optimum sintering parameters.

In this paper, the two hybrid algorithms of back propagation artificial neural network and genetic algorithm were used in the optimum design of the hot pressing parameters of an advanced ZrO2/TiB2/Al2O3 nanocomposite ceramic tool and die material. Compared with the BP algorithm, the predicted results of hybrid algorithm indicated that the combination algorithm can offer a robust and efficient way for the fabrication process design of ceramic tool and die materials.

In recent, the development of new die materials is one of the important topics in the field of die research. In this paper, effects of nano-ZrO2 addition on the microstructure and mechanical properties of Ti(C,N)-based cermets were studied. The newly developed Ti(C,N)-based cermet die materials with different contents of nano-ZrO2 of 0~25wt% were prepared by hot pressing technique under vacuum atmosphere at 1450°C for 30min. Moreover, the microstructure of this Ti(C,N)-based cermet die materials was observed by environmental scanning electron microscope. It indicates that the comprehensive mechanical properties can reach the optimum when the weight percent of the nano-ZrO2 is 10%. The corresponding flexural strength and fracture toughness is 967 MPa and 13.62 MPa•m1/2, respectively which is approximately 65% and 110% higher than that of the cermet without nano-ZrO2 addition. It suggests that the addition of nano-ZrO2 can improve the mechanical properties especially the fracture toughness and flexural strength of Ti(C,N)-based cermet die materials.

The effects of hot isostatic pressing temperature and cooling rate on the microstructure of two powder metallurgy beta-gamma titanium aluminide alloys with nominal compositions TiAl 4Nb 3Mn (G1) and TiAl-2Nb-2Mo (G2) are investigated. Particular attention is placed on the volume fraction of the beta phase, which is known to improve the hot workability. The alloys are consolidated by hot isostatic pressing at 1200 °C, 1250 °C, and 1300 °C, and cooled at rates between 3.0 °C/min and 17.5 °C/min. The volume fraction of beta phase in both alloys was unaffected by the change in cooling rates. The volume fraction of the beta phase in G2 decreased linearly from ~9.5 vol.% to ~3.5 vol.% with increasing HIP temperature from 1200 °C to 1300 °C.