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Gitifar V.,Shiraz University | Eslamloueyan R.,Shiraz University | Sarshar M.,Mechanical Engineering Research Center
Bioresource Technology | Year: 2013

In this study, pretreatment of sugarcane bagasse and subsequent enzymatic hydrolysis is investigated using two categories of pretreatment methods: dilute acid (DA) pretreatment and combined DA-ozonolysis (DAO) method. Both methods are accomplished at different solid ratios, sulfuric acid concentrations, autoclave residence times, bagasse moisture content, and ozonolysis time. The results show that the DAO pretreatment can significantly increase the production of glucose compared to DA method. Applying k-fold cross validation method, two optimal artificial neural networks (ANNs) are trained for estimations of glucose concentrations for DA and DAO pretreatment methods. Comparing the modeling results with experimental data indicates that the proposed ANNs have good estimation abilities. © 2013 Elsevier Ltd. Source


Iwasaki T.,Mechanical Engineering Research Center | Takahashi S.,Materials Research Center
Hitachi Review | Year: 2012

OVERVIEW: With the aim of realizing a sustainable society, Hitachi has formulated an Environmental Vision directed toward overcoming the challenges facing the global environment, and based on the three pillars of Prevention of Global Warming, Conservation of Resources, and Preservation of Ecosystems. Applying this initiative in the field of material development, Hitachi is developing simulation technology that works from first principles at the level of electrons and atoms to provide comprehensive predictions of chemical properties, such as reactions involving the formation and breaking of chemical bonds; physical properties, such as optical electromagnetic, and diffusion characteristics; and mechanical properties, such as breaking strength and deformation characteristics. Through the application of this technology, Hitachi is working on material designs for the three pillars of its Environmental Vision. In the future, Hitachi intends to utilize this technology for the efficient design of a wide range of different environmentally conscious high functional materials that will enhance the products it develops. © Hitachi, Ltd. 1994, 2012. Source


Minami H.,Hitachi High-Technologies | Mori J.,Hitachi High-Technologies | Iwai S.,Hitachi High-Technologies | Moriya H.,Hitachi High-Technologies | Watanabe N.,Mechanical Engineering Research Center
Hitachi Review | Year: 2011

OVERVIEW: The range of applications for large LCDs is expanding from PCs to TVs and the international adoption of LCDs is being accelerated by the shift from analog to digital broadcasting and by their use as a replacement for CRTs. It is anticipated that the trend to larger LCD sizes for TVs will continue to be driven by innovations such as the adoption of LED backlights and 3D TV. Leading production lines already use very large mother glass substrates in the 9-m2 range to achieve efficient production of LCDs at low-cost. As a leader in the field of tenth generation LCDs, Hitachi High-Technologies Corporation develops production, inspection, and other technologies and supplies a wide range of manufacturing equipment for LCDs capable of handling large glass sizes. Source


Yasuda T.,Development Center | Kamei T.,Hitachi Ltd. | Fujishita M.,Global Development Systems | Umekita K.,Mechanical Engineering Research Center
Hitachi Review | Year: 2011

Overview: Hitachi develops transport systems ("green mobility") that reduce the burden on the environment. In the field of construction machinery, it has developed highly efficient dump trucks for the mining industry through measures that include using lighter body structure and adopting electric drive. To encourage the wider adoption of railway systems which emit less CO2 per unit of load carried, Hitachi has also used computational fluid dynamics to develop and deploy environmentally conscious technologies that minimize noise and pressure fluctuations as well as maintenance technologies essential for reliable rail transport. For automotive systems, Hitachi has developed direct injection systems to improve the efficiency of vehicles powered by internal combustion engines, and electrodynamic brakes and other components to improve the efficiency of hybrid and electric vehicles. Through the development of green mobility, Hitachi is responding to the growing need to conserve energy throughout society which has been highlighted by the aftereffects of the recent earthquake in eastern Japan. Source


Tanaka H.,Hitachi Ltd. | Kamiya Y.,Hitachi Ltd. | Takano M.,Hitachi Ltd. | Nozaki T.,Mechanical Engineering Research Center
Hitachi Review | Year: 2011

OVERVIEW: Hitachi's long history in the field of air compressors reached 100 years in 2011 financial year. Over this time Hitachi has undertaken ongoing research and development and drawn on a wide range of technologies to meet customer needs. Along with a growing awareness of environmental problems, recent years have also seen demand from around the world for higher efficiency and larger energy savings from air compressors which consume a significant proportion of the electric power used in factories. To meet these needs in the coming 100 years, Hitachi intends to expand its air compressor business globally and operate it more speedily. Source

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