Micro fabrication of freeform surface parts made of hard and brittle materials is always a tough job in micro machining field. This paper tries to fabricate freeform surface feature by using smooth surface of tool ele...Micro fabrication of freeform surface parts made of hard and brittle materials is always a tough job in micro machining field. This paper tries to fabricate freeform surface feature by using smooth surface of tool electrode after tool wear in micro EDM. According to the skin effect theory, the tool end shape in the stage of uniform wear can be changed by adjusting the frequency of discharge pulse. The electrical energy distributing rule of tool electrode section in RC circuit has been investigated under the influence of skin effect, and the law of spark location change has been summarized. The experimental studies demonstrate that different shapes of tool ends can be achieved by varying the pulse frequencies of discharge power supply. Additionally, a micro part of freeform surface feature with high precision and good surface quality has been successfully obtained by micro EDM through adopting the smooth surface after tool wear.展开更多
In economic literature, the term ＇flying geese＂ refers to the movement of capital from developed regions to less developed ones. Using national data from abovescale manufacturing enterprises, this paper investigates...In economic literature, the term ＇flying geese＂ refers to the movement of capital from developed regions to less developed ones. Using national data from abovescale manufacturing enterprises, this paper investigates whether the experience of ＂flying geese＂ has transpired in China for manufacturing industries. We find that, driven by the effects of agglomeration, prior to the mid-2000s, there had been an increasing concentration of industrial activities in the coastal regions. However, as labor and land costs increased, the manufacturing sector - especially the labor-intensive industries - began to relocate from the coastal to the interior regions.展开更多
This paper shows the results of characterising a stainless steel composite material for applications in facade engineering. A number of possible shapes generated with pneumatic stretch forming are presented as a resul...This paper shows the results of characterising a stainless steel composite material for applications in facade engineering. A number of possible shapes generated with pneumatic stretch forming are presented as a result of simulation studies. In this context a model of a possible facade combined from different shapes is created to show the optical effect of the simulated shapes. Additionally, the manufacturing of a device for pneumatic stretch forming is discussed and first results of transforming the stainless steel composite material with pneumatic stretch forming are shown.展开更多
In the current economic development, the competitiveness of the traditional pattern is backward, so under the background of the high-end equipment manufacturing industry development facing of great pressure, how to ob...In the current economic development, the competitiveness of the traditional pattern is backward, so under the background of the high-end equipment manufacturing industry development facing of great pressure, how to obtain new competitive power to achieve sustained competitive advantage, how to develop from equipment manufacturing power to the development of equipment manufacturing power becomes the focus of the present. In this paper, based on talent accumulation effect, then analysis the advantages of high-end equipment manufacturing industry talents converging forces and its access to obtain talent agglomeration competitiveness.展开更多
This paper presents the development of circularly polarized microstrip antenna using Kevlar honeycomb core as the substrates for application of CP-SAR （circularly polarized synthetic aperture radar） which signal pro...This paper presents the development of circularly polarized microstrip antenna using Kevlar honeycomb core as the substrates for application of CP-SAR （circularly polarized synthetic aperture radar） which signal propagation is not affected by Faraday rotation effect in the ionosphere, as compared to linearly polarized systems especially at the L-band. The reason why Kevlar honeycomb core is used is because it is suitable for space environment in terms of lightweight and resistant to heat and shock. Measurements of the fabricated antenna were performed to confirm the simulation results. The results show good characteristics of the antennas except the axial ratio. The reason of insufficient axial ratio is assumed as fabrication error of the radiator and microstrip line.展开更多
Si/SiGe P-channel Metal-Oxide-Semiconductor Field Effect Transistor (PMOSFET) using P+ (phosphor ion) implantation technology is successfully fabricated. P+ implantation into SiGe virtual substrate induces a narrow de...Si/SiGe P-channel Metal-Oxide-Semiconductor Field Effect Transistor (PMOSFET) using P+ (phosphor ion) implantation technology is successfully fabricated. P+ implantation into SiGe virtual substrate induces a narrow defect region slightly below the SiGe/Si interface,which gives rise to strongly enhanced strain relaxation of SiGe virtual substrate. X-Ray Diffraction (XRD) tests show that the degree of relaxation of SiGe layer is 96% while 85% before implantation. After annealed,the sample appeared free of Threading Dislocation densities (TDs) within the SiGe layer to the limit of Trans-mission Electron Microscopy (TEM) analysis. Atomic Force Microscope (AFM) test of strained Si channel surface shows that Root Mean Square (RMS) is 1.1nm. The Direct Current (DC) characters measured by HP 4155B indicate that the maximum saturated transconductance is twice bigger than that of bulk Si PMOSFET.展开更多
With the acceleration of the rise of central China and the western development drive, industrial relocation from China＇s eastern region to the central and western regions is in full swing. However, does the relocatio...With the acceleration of the rise of central China and the western development drive, industrial relocation from China＇s eastern region to the central and western regions is in full swing. However, does the relocation demonstrate industrial clustering effect？ Empirical studies based on twenty two-digit manufacturing industries in 27provinces from 2000 to 2009 demonstrate that industrial clustering effect appeared in central and western regions which had undertaken industrial relocation from eastern region; however, the studies do not show excessive administrative interference as evidenced by the significantly improved productivity of the relocated industries. Compared with non-labor- intensive manufacturing industries, labor-intensive manufacturing industries are easier to form cyclic accumulative effects. Studies also revealed that improvement in supporting infrastructure, industrial chain and higher labor quality in non-agriculture employment during urbanization are significant for central and western regions to undertake industrial relocation.展开更多
The present study focuses on the design and choice of materials （steels S355 and 45SCD6） of a chassis of stirred tank （with a variable filling rate） for use in the manufacturing of cosmetic products. This tank or ...The present study focuses on the design and choice of materials （steels S355 and 45SCD6） of a chassis of stirred tank （with a variable filling rate） for use in the manufacturing of cosmetic products. This tank or trough will be submitted to important mechanical and thermal loads and pressure according to the various manufacturing processes. The authors propose a model of thermal and mechanical loads which takes into account the operating conditions of the tank. The analysis of the first 10 modes of vibration of the frame shows that the frequencies are much higher when the filling rate is high. They are higher for steel 45SCD6 than for the $355. The simulation results show that for a selected type of steel, the equivalent Von Mises stress increases along with increase in fill rates and thermal gradient. It appears that the influence of the thermal gradient is predominant. For both steels, the Von Mises equivalent stress is maximum in the beam 32 when the thermal gradient is at its lowest stage, and in the beam 40 for the greatest thermal gradient.展开更多
Stock prices have always been considered as unpredictable phenomena due to their dynamic patterns. Identifying the forces that contribute to variations of stock prices is probably one of the most researched areas in f...Stock prices have always been considered as unpredictable phenomena due to their dynamic patterns. Identifying the forces that contribute to variations of stock prices is probably one of the most researched areas in finance. This study relates stock prices to the stock volatility （measured by beta） and to corporate attributes, i.e., size, liquidity, profits, leverage, and returns. The study is based on manufacturing sector in India, and it is based on a sample of 3,027 manufacturing companies during the periods from 1991-1992 to 2006-2007 collected from the Centre for Monitoring Indian Economy （CMIE） database. The regressions were performed with the dummies for time effect and firm effect separately and then for both effects together. Panel data models have been used to estimate the stock prices equation. The model finds out fixed and random effects between independent and explanatory variables and analyzes them through Hausman test. The paper also studies multicollineairity that may exist amongst the selected variables. The study shows that volatility （represented by Beta）, profit （represented by earnings per share （EPS））, and size （represented by market capitalization （MCAP）） significantly influence the stock prices （at the level of 5%）. Panel data analysis using Hausman test supports the fixed effect model.展开更多
基金Supported by the National Natural Science Foundation of China （50635040） and the National Science Foundation of USA（CMMI-0728294 and CMMI- 0928873）
文摘Micro fabrication of freeform surface parts made of hard and brittle materials is always a tough job in micro machining field. This paper tries to fabricate freeform surface feature by using smooth surface of tool electrode after tool wear in micro EDM. According to the skin effect theory, the tool end shape in the stage of uniform wear can be changed by adjusting the frequency of discharge pulse. The electrical energy distributing rule of tool electrode section in RC circuit has been investigated under the influence of skin effect, and the law of spark location change has been summarized. The experimental studies demonstrate that different shapes of tool ends can be achieved by varying the pulse frequencies of discharge power supply. Additionally, a micro part of freeform surface feature with high precision and good surface quality has been successfully obtained by micro EDM through adopting the smooth surface after tool wear.
文摘In economic literature, the term ＇flying geese＂ refers to the movement of capital from developed regions to less developed ones. Using national data from abovescale manufacturing enterprises, this paper investigates whether the experience of ＂flying geese＂ has transpired in China for manufacturing industries. We find that, driven by the effects of agglomeration, prior to the mid-2000s, there had been an increasing concentration of industrial activities in the coastal regions. However, as labor and land costs increased, the manufacturing sector - especially the labor-intensive industries - began to relocate from the coastal to the interior regions.
文摘This paper shows the results of characterising a stainless steel composite material for applications in facade engineering. A number of possible shapes generated with pneumatic stretch forming are presented as a result of simulation studies. In this context a model of a possible facade combined from different shapes is created to show the optical effect of the simulated shapes. Additionally, the manufacturing of a device for pneumatic stretch forming is discussed and first results of transforming the stainless steel composite material with pneumatic stretch forming are shown.
文摘In the current economic development, the competitiveness of the traditional pattern is backward, so under the background of the high-end equipment manufacturing industry development facing of great pressure, how to obtain new competitive power to achieve sustained competitive advantage, how to develop from equipment manufacturing power to the development of equipment manufacturing power becomes the focus of the present. In this paper, based on talent accumulation effect, then analysis the advantages of high-end equipment manufacturing industry talents converging forces and its access to obtain talent agglomeration competitiveness.
文摘This paper presents the development of circularly polarized microstrip antenna using Kevlar honeycomb core as the substrates for application of CP-SAR （circularly polarized synthetic aperture radar） which signal propagation is not affected by Faraday rotation effect in the ionosphere, as compared to linearly polarized systems especially at the L-band. The reason why Kevlar honeycomb core is used is because it is suitable for space environment in terms of lightweight and resistant to heat and shock. Measurements of the fabricated antenna were performed to confirm the simulation results. The results show good characteristics of the antennas except the axial ratio. The reason of insufficient axial ratio is assumed as fabrication error of the radiator and microstrip line.
基金Supported by the Funds of National Key Laboratory of Analog IC (2000JS09.3.1.DZ02).
文摘Si/SiGe P-channel Metal-Oxide-Semiconductor Field Effect Transistor (PMOSFET) using P+ (phosphor ion) implantation technology is successfully fabricated. P+ implantation into SiGe virtual substrate induces a narrow defect region slightly below the SiGe/Si interface,which gives rise to strongly enhanced strain relaxation of SiGe virtual substrate. X-Ray Diffraction (XRD) tests show that the degree of relaxation of SiGe layer is 96% while 85% before implantation. After annealed,the sample appeared free of Threading Dislocation densities (TDs) within the SiGe layer to the limit of Trans-mission Electron Microscopy (TEM) analysis. Atomic Force Microscope (AFM) test of strained Si channel surface shows that Root Mean Square (RMS) is 1.1nm. The Direct Current (DC) characters measured by HP 4155B indicate that the maximum saturated transconductance is twice bigger than that of bulk Si PMOSFET.
文摘With the acceleration of the rise of central China and the western development drive, industrial relocation from China＇s eastern region to the central and western regions is in full swing. However, does the relocation demonstrate industrial clustering effect？ Empirical studies based on twenty two-digit manufacturing industries in 27provinces from 2000 to 2009 demonstrate that industrial clustering effect appeared in central and western regions which had undertaken industrial relocation from eastern region; however, the studies do not show excessive administrative interference as evidenced by the significantly improved productivity of the relocated industries. Compared with non-labor- intensive manufacturing industries, labor-intensive manufacturing industries are easier to form cyclic accumulative effects. Studies also revealed that improvement in supporting infrastructure, industrial chain and higher labor quality in non-agriculture employment during urbanization are significant for central and western regions to undertake industrial relocation.
文摘The present study focuses on the design and choice of materials （steels S355 and 45SCD6） of a chassis of stirred tank （with a variable filling rate） for use in the manufacturing of cosmetic products. This tank or trough will be submitted to important mechanical and thermal loads and pressure according to the various manufacturing processes. The authors propose a model of thermal and mechanical loads which takes into account the operating conditions of the tank. The analysis of the first 10 modes of vibration of the frame shows that the frequencies are much higher when the filling rate is high. They are higher for steel 45SCD6 than for the $355. The simulation results show that for a selected type of steel, the equivalent Von Mises stress increases along with increase in fill rates and thermal gradient. It appears that the influence of the thermal gradient is predominant. For both steels, the Von Mises equivalent stress is maximum in the beam 32 when the thermal gradient is at its lowest stage, and in the beam 40 for the greatest thermal gradient.
文摘Stock prices have always been considered as unpredictable phenomena due to their dynamic patterns. Identifying the forces that contribute to variations of stock prices is probably one of the most researched areas in finance. This study relates stock prices to the stock volatility （measured by beta） and to corporate attributes, i.e., size, liquidity, profits, leverage, and returns. The study is based on manufacturing sector in India, and it is based on a sample of 3,027 manufacturing companies during the periods from 1991-1992 to 2006-2007 collected from the Centre for Monitoring Indian Economy （CMIE） database. The regressions were performed with the dummies for time effect and firm effect separately and then for both effects together. Panel data models have been used to estimate the stock prices equation. The model finds out fixed and random effects between independent and explanatory variables and analyzes them through Hausman test. The paper also studies multicollineairity that may exist amongst the selected variables. The study shows that volatility （represented by Beta）, profit （represented by earnings per share （EPS））, and size （represented by market capitalization （MCAP）） significantly influence the stock prices （at the level of 5%）. Panel data analysis using Hausman test supports the fixed effect model.
