Abstract: In this paper, alumina ceramic samples were ablated with HGW-300 solid laser in sodium hydroxide solution medium. The morphology and structure of the ablated surface were investigated by SEM and XRD. The results show that, the mass loss increased with increased processing voltage. With the laser scanning speed increasing, the mass loss of alumina ceramic sample decreasing. While pulse width is 1.4ms, the mass loss of the sample gets maximum.When the repeat frequency is 40Hz, the mass loss of the sample in 20g/L sodium hydroxide solution reaches a maximum and then drops down. Corrosive medium can increase the mass loss of alumina. When the samples were tested in 20g/l sodium hydroxide solution, their mass losses is higher than in any other solutions.
Abstract: Hardness of electronless Ni-P alloy plating which have five different phosphorus content were investigated with HX-1000 type microscopic Vickers hardness tester, respectively. Phosphorus content of Ni-P platings were investigated by Quanta 200 type scanning electron microscope and Oxford Energy Disperse Spectroscopy Heat treatment temperature and time of the different platings were optimized and analysed by Uniform Design method, respectively. The results show that correlation consist between maximum hardness of the Ni-P alloy plating and heat treatment temperature, not heat treatment time under the experimental condition which the heat treatment time is between one hour and five hours, and maximal value of the plating hardness appears when the heat treatment temperature is 400-430 Celsius degree. Maximal hardness value of the electronless Ni-P alloy plating increases with increase of their phosphorus content under heat treatment condition.
Abstract: The vehicle routing problem of relief supplies distribution, a typical NP-hard problem, is a hot topic in transportation research. Aiming at a two-echelon supply chain made up of a set of depots and stricken-points, the paper studies the problem how to decide delivery objects and the optimal delivery scheme; This paper decomposes the distribution VRP of relief supplies into an assignment problem and a problem similar to Traveling Salesman Problem, applies the theory of Thiessen Tessellation in spatial analysis to solve the assignment problem. For the sake of the problem of relief supplies distribution with uncertain time, a concept of risk exceeding time has been brought forth, and a multi-layer planning model with the least risk exceeding time has been established, too. At last, an example for this algorithm is given to prove the applicability of the model.
Abstract: The near-bit geosteering drilling technology is a new high-tech .It integrats the techniques of drilling, logging and reservoir engineering. The paper introduced the application of this technology in oil exploration. CGDS is a kind of production of this technology applications. The paper introduced the structure ,function, parameters of CGDS production and its application in oil field. CGDS is recognized as the high and new technique in 21 century which ensures you to achieve the best place of a wellbore within a reservoir by providing geological, engineering parameter measurements and while drilling monitoring. With excellent ability of identification of hydrocarbon reservoir and direction guide, CGDS assists you to adjust and control the wellbore trace in real time according to the information of formation features. Through the introduction of this instrument,We can know more about the near-bit geosteering drilling technology The application prospect and development trend of the geosteering drilling system were also discussed.
Abstract: Along with the arriving of the information era, more and more people begin to utilize network and computers in their job, making it a new popularized living and fashionable trend. As for this, tradition residential buildings are not able to satisfy people’s needs of work, while tradition office buildings can not meet people’s needs of living as well. Therefore, a new type of building, which integrates its residential function with working function altogether, is urgently demanded to fulfill the objective requirements of the society. The SOHO people work at home, living in groups, and their jib requirements may change, or bring about new situations along with the development of the era. Correspondingly, the design of SOHO residential unit shall also develop and update with new contents in practice. The paper has made deep analysis and discuss on design of functional spaces in SOHO residential unit. After giving consideration to the living features of SOHO groups, as well as based on the concept of economical usage of buildings, the paper further proposed that, in the design of SOHO residential unit, the interaction and interdependency among the three elements of human beings, facilities and environment shall be systematically studied to play the entire unit to its highest performance.
Abstract: The FeAl intermetallics compounds bulks were fabricated by hot-pressing process. The FeAl intermetallics compounds powders were fabricated by mechanical alloying and heat treatment process. The phase composition and microstructure of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition and microstructure of the FeAl intermetallics compounds bulks fabricated by hot-pressing process were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment process at 800oC, 900oC and 1000oC. The microstructure showed that the mean particles sizes of the Fe-Al intermetallics compounds powders produced by mechanical alloying decreased remarkably with the increase of milling time. The microstructure showed that the mean particles size of the Fe-Al intermetallics compounds powders produced by mechanical alloying and heat treatment was rather fine and about 4-5μm. The FeAl intermetallics compounds bulks were fabricated by hot-pressing process at 1100oC for 2h under the pressure of 35MPa. The XRD patterns results showed that there existed the FeAl intermetallics compounds phase in sintered bulks. The FeAl intermetallics compounds bulks exhibited the homogenous and compact microstructure. The mean particles size of the FeAl intermetallics compounds was about 2-3μm. The FeAl intermetallics compounds bulks exhibited the high relative density. The FeAl intermetallics compounds bulks with the high relative density were fabricated by hot-pressing process.
Abstract: To increase the wear resistance of components in slurry pump suffering from serious corrosive abrasion, new super high chromium cast iron (SHCCI) which contains 37wt.% chromium approximately and different carbon content were developed based on the high chromium cast iron with 26wt.% Cr (Cr26). The microstructure of SHCCI was investigated by SEM and XRD. The hardness and impact toughness of SHCCI was tested, and the corrosive wear property of SHCCI was also researched using MCF-30 type erosion abrasion tester under H3PO4 medium condition. The results show that the microstructure of SHCCI is composed of carbide of M7C3+M23C6, martensite and retained austenite. With the increase of carbon content, the hardness of SHCCI first increases and then decreases, the toughness increases, and the corrosive wear property decreases. The relative wear resistance of SHCCI is obviously superior to that of Cr26 cast iron, and the maximal relative wear resistance of SHCCI is three times higher than that of Cr26 cast iron.
Abstract: Applies EDI in the logistics system, can make the constituent parties of supply chain logistics system, through based on standardized information formats and processing methods to share logistics system information, improve circulation efficiency and reduce logistics costs. In view of traditional EDI the problems exist in the bills circulation, use the XML to research. First, through the establishment of logistics EDI model, gives the workflows using the EDI to conduct the logistics business information process. Secondly, discusses the standardization problems which need solve by using the EDI to conduct logistics bills circulation. Then, in the format that XML is based on EDI, established EDI electronic commerce logistics model based XML. Finally, studies the data bills interchange base on XML, including mapping models of XML and relational database, mapping methods and conversion methods. The results show that, XML and EDI combination, allowing the exchange of data in different formats, can increase the information level of logistics and improve the core competitiveness of supply chain system.
Abstract: The forging of crusher main shaft, with diameter of φ1540mm and weight of 47780Kg, requires 90 tons of steel ingot, and have a higher demand for grain size. In order to meet the demand of ultrasonic examination, some effective measures, including LF refining, VCD treatment and ingot casting in vacuum, were taken in process in smelting and ingot casting. In this paper, two main shafts were manufactured, and two technologies were adopted respectively to control grain size. One was without modification, relying on subsequent heat treatment to refine grain. The other was modification, adding a trace amount of Nb to refine grain. Both of methods finally make grain size to reach 7-8 degree, higher than the standards, achieving very good results.
Abstract: Cellulose Stearate (CS) was synthesized by acylating microcrystalline cellulose (MCC) in homogeneous system with p-toluenesulfonyl chloride (Tos-Cl) and stearic acid (SA). The reactive conditions were discussed. The molar ratio of AGU:SA:Tos-Cl was the key factor which affected the degree of substitution (DS) of CS. In the present paper, CSs with DS ranging from 0.64 to 2.35 were prepared under mild condition. The structure of CS was characterized by FT-IR and 1H-NMR, and DS of CS was determined by traditional saponiﬁcation method and 1H-NMR, respectively. The solubility of CS was also investigated; the results showed that the higher DS of CS was, the easier CS dissolved in organic solvents. The thermal analysis was measured with DSC, and the results indicated that the glass transition temperature (Tg) and the maximum temperature of thermal decomposition (Tmax) of CS were dependent on DS.