Sogut Z.,Army Academy |
Oktay Z.,Balikesir University |
Karakoc H.,Anadolu University
Applied Thermal Engineering | Year: 2010
In this study, heat recovery from rotary kiln was examined for a cement plant in Turkey. At first, an exergy analysis was carried out on the operational data of the plant. Results indicated the presence of 217.31 GJ of waste heat, which is 51% of the overall heat of the process. Then a mathematical model was developed for a new heat recovery exchanger for the plant. It was determined that 5% of the waste heat can be utilized with the heat recovery exchanger. The useful heat obtained is expected to partially satisfy the thermal loads of 678 dwellings in the vicinity through a new district heating system. This system is expected to decrease domestic-coal and natural gas consumption by 51.55% and 62.62% respectively. CO2 emissions may also be reduced by 5901.94 kg/h and 1816.90 kg/h when waste heat is used instead of coal and natural gas. © 2009 Elsevier Ltd. All rights reserved.
News Article | February 24, 2017
Le Young Pictures, a Chinese web TV and film studio established by the wife of LeEco’s founder Jia Yueting, has recently raised an undisclosed amount for its series A financing which places the company valuation at RMB1.2 billion (about US$174 million). Speaking on the valuation of the company, Gan Wei said, “Looking at the present revenue of the company, a valuation between RMB10 to RMB15 billion is considered reasonable. In fact, since the beginning of 2016, many investors has expressed interests in funding the company.” Selected investors include CDH Fund, Shanghai-based Linmon Pictures, and Le Kai Hua Fund. At the same time, Le Yong Pictures also announced that it is adopting an employee stock ownership plan (ESOP), which will bring a huge benefit to its employees. Founded in June 2015 by Gan Wei, Le Young Pictures ventures in business scopes including film production, broadcasting, investment, live film distribution, cultural and entertainment projects etc. which is related to the entertainment industry. At present, Le Young Picture has produced entertainment reality shows “OMG! Cui” and “A Sharp Tongue” as well as television series “Xuan Yuan Sword Legend: The Clouds of Han” and “Dear Achimides” etc. Its most popular production is the web TV series “Go Princess Go” directed by Gan Wei. It premiered in December 2015 and has reached over 2.4 billion in viewerships which generated more than US$1.5 million in profit. Born in 1984, Gan Wei is a former actress and wife Jia Yueting, the founder of Chinese Internet giant Le Eco. She graduated from the People’s Liberation Army Academy of Art in Beijing China and has acted in a number of movies including Kungfu Cyborg, Welcome to Shama Town and The Girls which is a production of LeTV. Le Young Pictures is currently working with Twenty-First Century Fox Inc and Korean Broadcasting System to produce a Korean version of the Go Princess Go series, an adaptation of a novel telling a story of a modern playboy traveling back in time 1,000 years to find himself in the body of a royal princess. Commenting on the relationship between LeEco and Le Young, Gao FeiCheng the CEO of LeEco said, “Although most of the future productions will see the partnership between Le Young and LeEco, but from a legal point of view, Le Young Pictures is an independent entity, be it operationally and financially.” At present, China’s market for online entertainment is witnessing an exponential development. Huacheng Securities Research Report believes that China’s network drama market size in 2017 will increase up to RMB42.5 billion, of which the copyright market will takeup RMB13.8 billion.
Peng D.-X.,Army Academy
Industrial Lubrication and Tribology | Year: 2014
Purpose-Chemical mechanical polishing (CMP) has attracted much attention recently because of its importance as a nano-scale finishing process for high value-added large components that are used in the aerospace industry. The paper aims to discuss these issues. Design/methodology/approach-The characteristics of aluminum nanoparticles slurry including oxidizer, oxidizer contents, abrasive contents, slurry flow rate, and polishing time on aluminum nanoparticles CMP performance, including material removal amount and surface morphology were studied. Findings-Experimental results indicate that the CMP performance depends strongly on the oxidizer, oxidizer contents, and abrasive contents. Surface polished by slurries that contain nano-Al abrasives had a lower surface average roughness (Ra), lower topographical variations and less scratching. The material removal amount and the Ra were 124 and 7.61 nm with appropriate values of the process parameters of the oxidizer, oxidizer content, abrasive content, slurry flow rate and polishing time which were H2O2, 2 wt.%, 1 wt.%, 10 ml/min, 5 min, respectively. Originality/value-Based on SEM determinations of the process parameters for the polishing of the surfaces, the CMP mechanism was deduced preliminarily. © Emerald Group Publishing Limited.
Liao C.-C.,Army Academy |
Liao C.-C.,Chung Yuan Christian University |
Chung T.-W.,Chung Yuan Christian University
Chemical Engineering Research and Design | Year: 2013
A transesterification reaction of Jatropha curcas oil with methanol in the presence of KOH impregnated CaO catalyst was performed in a simple continuous process. The process variables such as methanol/oil molar ratio (X1), amount of catalyst (X2) and total reaction time (X3) were optimized through response surface methodology, using the Box-Behnken model. Within the range of the selected operating conditions, the optimal ratio of methanol to oil, amount of catalyst and total reaction time were found to be 8.42, 3.17% and 67.9min, respectively. The results showed that the amount of catalyst and total reaction time have significant effects on the transesterification reaction. For the product to be accepted as a biodiesel fuel, its purity must be above 96.5% of alkyl esters. Based on the optimum condition, the predicted biodiesel conversion was 97.6% while the actual experimental value was 97.1%. The above mentioned results demonstrated that the response surface methodology (RSM) based on Box-Behnken model can well predict the optimum condition for the biodiesel production. © 2013 The Institution of Chemical Engineers.
Huang Y.-S.,Chung Cheng Institute of Technology |
Sung C.-C.,Chung Cheng Institute of Technology |
Sung C.-C.,Army Academy
IEEE Transactions on Industrial Electronics | Year: 2010
This paper presents a new methodology for designing and implementing position control for permanent-magnet linear synchronous motor (PMLSM) systems. We utilize both a new function-based sliding-mode control (SMC) method and direct thrust control (DTC). It has been established that chattering is a problem in conventional SMC and stems from discontinuous control. However, the new function-based controller allows designers to employ fuzzy membership functions directly. The advantage of the proposed method is that the chattering phenomenon can be reduced and/or completely eliminated. The design of the control method for the proposed system can be performed without the need for great expertise as it does not require the use of very complicated techniques. It should be noted that we have managed to control the inherent flux linkage problems associated with PMLSMs. To our knowledge, this is the first work that combines the new SMC with DTC techniques in order to create a position control for a real-world PMLSM. Simulation and experimental results verify that the proposed method can achieve favorable control performance with regard to parameter variations and external disturbances. © 2006 IEEE.
Lee L.-J.,Army Academy
Journal of Electronic Testing: Theory and Applications (JETTA) | Year: 2013
Eliminating the excessive test power for integrated circuits is a strict challenge within the nanometer era. This method combines test pattern generation with the scan chain disabling technique to achieve low capture power testing under the single stuck-at fault model. Testability analysis is exploited to assist in the test pattern generation process to generate the observation-oriented test patterns. In order to direct fault effects to the frequently-used circuit outputs, unbalanced observability costs are purposely assigned to circuit outputs to introduce unequal propagation probability. Observation-aware scan chain clustering is then performed through a weighted compatibility analysis to densely cluster the frequently-used scan cells into scan chains. Consequently, more scan chains can be disabled in the capture cycle and significant power reduction can be achieved without affecting the fault coverage. To simultaneously consider the reduction in large test data volume and capture power, the power-aware test vector compaction algorithm is also performed. Experimental results for the large ISCAS'89 benchmark circuits show that significant improvements can be simultaneously achieved including 71.7 % of capture power reduction, 43.7 % of total power reduction, 24.3 % of peak power reduction and 98.0 % of test data compaction ratios averagely. Results for three large ITC'99 benchmark circuits also demonstrate the effectiveness of the proposed method for the practical-scale circuits. © 2013 Springer Science+Business Media New York.
Ziya Sogut M.,Military Academy |
Ziya Sogut M.,Army Academy
Energy Conversion and Management | Year: 2012
In this study, exergetic efficiency of Turkish cement production and CO 2 emissions caused by the sector due to exergetic losses and environmental effects are examined, considering the clinker production between 1999 and 2007. As a first step, exergy analyses based on dead state temperature and production data of clinker are carried out according to the second law of thermodynamics. Consequently, CO 2 emissions of the clinker production according to exergy losses, improvement and anergy potentials are determined. Exergy efficiency of the kiln and exergetic improvement potential are found as 43.04% and 123.29 × 10 6 GJ/h respectively on average. In this system, CO 2 emissions caused by exergetic losses are calculated as 75.18 × 10 6 kg/h, 25.06 × 10 6 kg/h and 81.45 × 10 6 kg/h respectively on average for the coal mixture, natural gas and fuel-oil. At the end of the study, the present technique is suggested as a useful tool to improve energy policies and provide energy conservation measures, especially in this type of industrial processes. © 2011 Elsevier Ltd. All rights reserved.
Liao C.-C.,Army Academy |
Chung T.-W.,Chung Yuan Christian University
Chemical Engineering Research and Design | Year: 2011
A simple continuous process was designed for the transesterification of Jatropha curcas (J. curcas) oil to alkyl esters using microwave-assisted method. The product with purity above 96.5% of alkyl ester is called the biodiesel fuel. Using response surface methodology, a series of experiments with three reaction factors at three levels were carried out to investigate the transesterification reaction in a microwave and conversion of alkyl ester from J. curcas oil with NaOH as the catalyst. The results showed that the ratio of methanol to oil, amount of catalyst and flow rate have significant effects on the transesterification and conversion of alkyl ester. Based on the response surface methodology using the selected operating conditions, the optimal ratio of methanol to oil, amount of catalyst and flow rate of transesterification process were 10.74, 1.26. wt% and 1.62. mL/min, respectively. The largest predicted and experimental conversions of alkyl esters (biodiesel) under the optimal conditions are 99.63% and 99.36%, respectively. Our findings confirmed the successful development of a two-step process for the transesterification reaction of Jatropha oil by microwave-assisted heating, which is effective and time-saving for alkyl ester production. © 2011 The Institution of Chemical Engineers.
Peng D.-X.,Army Academy
Industrial Lubrication and Tribology | Year: 2012
Purpose - The purpose of this paper is to test whether TiC clad layer deposited on carbon steel by gas tungsten arc welding (GTAW) improves carbon steel substrate wear resistance. Design/methodology/approach - Cladding microstructure and cladded surface hardness were tested in samples prepared under varying welding parameters. The chemical composition, microstructure and surface morphology of the cladded layer were analyzed by optical microscope, scanning electron microscopy and energy dispersive X-ray spectroscopy. The wear behavior of the cladded layer was studied with a block-on-ring tribometer. Wear mechanisms in the specimens are discussed based on microscopic study of wear surface characteristics. Findings - The experimental results revealed an excellent metallurgical bond between the composite coating and substrate. Hardness was increased from HRb 6.6 in the substrate to HRb 65 in the modified layer due to the presence of the hard TiC phase. Experimental comparison of varying welding parameters revealed that welding speed and current had the largest effect on the hardness and wear resistance of the cladded layer. Originality/value - The paper shows that by using cladding techniques to improve surface properties such as resistances to wear, corrosion, and oxidation, service life can be increased, and machinery costs can be reduced. Copyright © 2012 Emerald Group Publishing Limited. All rights reserved.
Hwang J.-J.,Army Academy |
Ma T.-W.,Army Academy
Materials Chemistry and Physics | Year: 2012
Modified montmorillonite was intercalated with polyacrylonitrile (PAN) and then reacted with AgNO 3. Plate-like clay, with anionic charges and a large surface area, was the dispersant of the silver ions. Aqueous 3% NaBH 4-reduced Ag + (in situ) was utilized to prepare a series of polyacrylonitrile/montmorillonite/silver nanocomposites (PAN/o-MMT/Ag). The presence of silver particles with diameters of 50-100 nm was confirmed by X-ray and SEM observations. XRD diffraction peaks were obtained at 38.2°, 44.4°, 64.6° and 77.6°. AFM and TEM were used to evaluate the surface roughness of the nanocomposites and the dispersion of the silver nanoparticles (AgNPs) therein nanocomposites. Adding o-MMT made the nanocomposites rougher. The AgNPs were primarily located in the layered silicate nanofiller. In addition, the silver in nanocomposites was released to the water and dominant form of silver was nanoparticle in the water was verified by particle size analyzer and atomic absorption spectrometer. A higher F value (F = [AgNO 3/CH 2CH(CN)], which was the molar ratio of the salt to the PAN repeat unit) of the PAN/3 wt.% o-MMT/Ag nanocomposites corresponded to larger average particle size and more AgNPs in the 2 wt.% AgNPs solution. The bactericidal property of AgNPs solution, which was obtained by soaking PAN/o-MMT/Ag nanocomposite films in distilled water, was evaluated by the paper disc diffusion method. The results revealed that the AgNPs solution did not inhibit the growth of filamentous fungi but was quite effective against tiny bacteria of Gram (+) Staphylococcus aureus, Gram (-) Escherichia coli and Klebsiella pneumonia. In particular, using a 2 wt.% AgNP solution that was obtained by soaking PAN/3 wt.% o-MMT/Ag nanocomposite (F = 0.20) for 24 h in distilled water showed the most effectively inhibited growth of bacteria (16.4 mm). Its antibacterial activity still remained, yielding an inhibition zone with a diameter of 13.0-13.6 mm for 30 days in distilled water, and yielding an inhibition zone with a diameter over 10 mm after fourth submersions in distilled water. © 2012 Elsevier B.V. All rights reserved.