The tone captures how the leaders of listed company confidence to the performance and tone changes correlate with revisions of future outlook. Current predicting stock market behaviour is using numerous quantitative financial factors. Recent publications have demonstrated that some implied sentiment information such as tone changes in annual reports can be successfully used to predict the stock price in the U.S market. However, the investors' reflection to the tone changes in annual reports in Asia market, especially in Asian financial center Hong Kong, is still unknown. In this paper, the chairman's statement tone changes in annual reports from the Hong Kong market have been studied in the first time. This study evaluates three different tone changes methods and combing with financial indicators to predict the stock price. The experimental results prove that the tone changes of annual reports can predict the stock price in the long trend, which implies the low market efficiency in Hong Kong. Moreover, some experiments have been investigated whether the financial crisis can be predicted from the chairman's tone changes.
The paper introduces a new self-adjustable diaphragm,and analyses the principle improving the grinding efficiency and reducing the energy consumption of the mill by use of the diaphragm.Practice proves that the use of the new diaphragm achieves good result.
During the gas extraction drilling process, especially the soft coal seam drilling process, due to the constraints of geological conditions, technical conditions, and other factors, it is easy to encounter stuck holes, blowout, lost circulation, and hole collapse, which affect the realization of efficient gas management. In the petroleum industry, microfoam drilling fluid has unique advantages as a drilling and flushing medium. Through the response surface method, this study conducts a preliminary experimental study on the types of foaming agents, foam stabilizers, modified bentonite materials, and filtrate reducers and determines the optimal formula as 3.98% modified bentonite + 0.586% compound foaming agent + 0.776% foam stabilizer + 1% sulfonated phenolic resin + 2% carboxymethyl starch sodium. The performance of the microfoam drilling fluid system is tested. Subsequently, a simulated soft coal seam drilling test is carried out to verify the effectiveness of the developed directional microfoam drilling fluid for protecting coal rock holes. This microfoam drilling fluid system technology can improve the drilling quality of the sealing section of coal seam gas extraction drilling and effectively improve the gas extraction rate of coal mines.
In fields like imaging and illumination, different types of optical structured surface have been used in a wide variety of applications. However, defects such as tool marks, burs and debris are normally left on the structured surface during the machining process. How to remove aforesaid defects, and furtherly improve the surface quality with a higher efficient, so as to reach better functional performance is still a challenging problem. This chapter presents an advanced method, maskless fluid jet polishing (MFJP), to solve this problem. In MFJP, without using a mask, material can be removed in a tiny scale by low pressure micro abrasive water jet slurry impinged on the structured surface. On the basis of the analysis of surface roughness, form maintainability, and surface smoothness, experimental investigations on the polishing of sinusoidal structured surface and V-groove structured surface were performed to achieve the technical feasibility of MFJP on structured surface. In order to prove the fluid flow movement and material removal characteristics and to achieve a simulation of the MFJP process on V-groove surface, a computational fluid dynamics (CFD) model was also developed. Additionally, the influence of the key polishing parameters was also researched and discussed. The results indicate that MFJP can observably improve the surface quality of optical structured surface, while achieving high form maintainability under defined conditions. As a potentially competitive method for the precision polishing on optical structured surfaces, MFJP can also hold promise for polishing other surfaces with small or micro-meter sized cavities or channels, such as microfluidic chips, etc.
In this chapter, a new micro-structured diffusion sheet for LED (light-emitting diode) was developed by combining efficient and precise hybrid processing methods with micro-injection molding and micro-grinding, enabling cost-effective large-scale production of LED lamps with excellent light output. First, the mold core of the microstructure is machined to a controlled shape and surface quality using a precision V-shaped grinding wheel. Secondly, the micro-structured LED diffusion plates were rapidly processed by micro-injection molding technology. Finally, the effect of microinjection molding process parameters on the illumination of the micro-structured diffuser plate was investigated. According to the simulated optical results the illumination of the micro-structured diffuser plate can reach the highest value when the V-groove depth and V-groove angle are calculated as 300 μm and 60°, respectively. The experimental results show that the developed micro-structured diffuser plate can enhance the illuminance by about 40.82% compared to the conventional diffuser plate. The prediction accuracy of the developed illumination efficiency simulation method is 90.33%.
In this paper, in view of low grinding efficiency and poor ground surface quality of sapphire glass, the coarse diamond grinding wheel dressed by dry impulse electrical discharge was proposed to perform efficient and precise grinding machining of sapphire glass. The dry electrical discharge dressing technology was employed to obtain high grain protrusion and sharp micro-grain cutting edges. The influences of grinding process parameters such as wheel speed, depth of cut and feed speed on the ground surface quality, grinding force and grinding force ratio on sapphire glass were investigated, and the relationship between grinding force and ground surface quality was also revealed. The experimental results show that the grain protrusion height on the surface of a coarse diamond grinding wheel dressed by dry electrical discharge can reach 168.5 µm. The minimum line roughness Ra and surface roughness Sa of ground sapphire glass surface were 0.194 µm and 0.736 µm, respectively. In order to achieve highly efficient ground quality of sapphire glass, the depth of cut was controlled within 7 µm, and the wheel speed and feed speed were 3000–5000 r/min and 10–20 mm/min, respectively. The influences of feed speed and wheel speed on grinding force ratio were more significant, but the influence of depth of cut was little.
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