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Effect of microtemperatures for micropolar thermoelastic bodies
Marin Marin,Dumitru Baleanu,Sorin Vlase 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.3
In this paper we investigate the theory of micropolar thermoelastic bodies whose micro-particles possess microtemperatures. We transform the mixed initial boundary value problem into a temporally evolutionary equation on a Hilbert space and after that we prove the existence and uniqueness of the solution. We also approach the study of the continuous dependence of solution upon initial data and loads.
Relaxed Saint-Venant principle for thermoelastic micropolar diffusion
Marin Marin,Ibrahim Abbas,Rajneesh Kumar 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.4
The main goal of this study is to extend the domain of influence result to cover the micropolar thermoelastic diffusion. So, we prove that for a finite time t>0 the displacement field ui, the microrotation vector φi, the temperature θ and the chemical potential P generate no disturbance outside a bounded domain Bt.
함정 전기추진시스템 글로벌 트렌드와 차세대 구축함에 대한 제언
GE 파워컨버젼 사업부, GE Marine(GE Power Conversion, GE Marine) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.4
자동차 및 항공 부문 등에서는 미래에 점점 더 깨끗한 운송 및 원거리 연결을 위한 플랫폼을 도입하거나 평가하기 위해 전동화 즉, 전기추진 또는 하이브리드추진 플랫폼을 적극적으로 고려하고 있다. 그러나 전동화는 조선해양 분야에서는 그리 새로운 것은 아니며 이미 약 100년 전에 처음 선박용으로 전기 및 하이브리드 추진시스템이 소개되었다. GE는 해군 함정의 추진 부문, 특히 전기 및 하이브리드 추진 기술과 관련해서 매우 초기단계 부터 혁신적인 기술을 도입해왔던 선구자로써 각 추진방식에 대한 장/단점, 앞으로의 방향에 대하여 기술하고자 한다.
Identification of a Prophage-encoded Abortive Infection System in Levilactobacillus brevis
( Marine Feyereisen ),( Jennifer Mahony ),( Tadhg O Sullivan ),( Viktor Boer ),( Douwe Van Sinderen ) 한국미생물 · 생명공학회 2020 한국미생물·생명공학회지 Vol.48 No.3
Abortive infection systems (Abi) are phage resistance systems that can be prophage-encoded. Here, two genes encoding an Abi system were identified on a prophage sequence contained by the chromosome of the Levilactobacillus brevis strain UCCLBBS124. This Abi system is similar to the two-component AbiL system encoded by Lactococcus lactis biovar. diacetylactis LD10-1. The UCCLBBS124 prophage-derived Abi system (designated here as AbiL124) was shown to exhibit specific activity against phages infecting L. brevis and L. lactis strains. Expression of the AbiL124 system was shown to cause reduction in the efficiency of plaquing and cell lysis delay for phages of both species.
The Rise of Eco Enterprises in Japan
Mariner Wang 중앙대학교 한국전자무역연구소 2010 전자무역연구 Vol.8 No.1
최근 몇 년 동안 전 세계적으로 환경이슈에 관한 관심이 증대되었다. 일본 또한 예 외는 아니다. 일본정부는 근래에 교토의정서 합의 후, 환경 친화적 가전제품, 연료효율자동차, 태 양력발전, 풍력발전, 탈황화 등 환경 친화적 사업을 고무적으로 발전시켜 오고 있다. 본 논문은 친환경자동차와 에너지효율 가전기구의 부상, 광전지와 풍력 비즈니스, 정부주도의 환경비즈니스 촉진 그리고 재활용비즈니스를 다룬다. 본 연구의 목적은 최근 이슈화되고 있는 친환경자동차와 연료효율가전제품, 정부 주도적 환경 사업 추진, 일본의 재활용 사업 등에 관한 배경적 요소를 알아보고, 전 세계적으로 환경보존을 위한 국제적 협력의 중요성에 대해서도 제안하는 것이다. During the recent years, there exists a great concern about the environmental issue globally. Japan is without the exception either. Japanese government for some years, with a view to keeping its promises as jointly agreed in the Kyoto Protocol, has been positively developing the environment-friendly appliances, like fuel-efficient car, solar power generation, wind power generation, desulfurization equipments and etc. This paper deals with the rise of eco car and energy-efficient home appliances, the development of photovoltaic and wind power business, and government-led environment business promotion and the rise of recycling business. The purpose of this paper is to contribute to provide with the information pertaining to background factors regarding the rise of eco car and energy-efficient home appliance, government-led environment business promotion, recycling business in Japan as well as the importance of international cooperation for an environmental sustainability globally.
Evolutionary multi-objective optimization of energy efficiency in electrical discharge machining
Marin Gostimirovic,Vladimir Pucovsky,Milenko Sekulic,Miroslav Radovanovic,Milos Madic 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10
Electrical energy, which in the machining zone is transformed into heat, is of key importance in electrical discharge machining (EDM). Machining performance of EDM is determined by the characteristic of discharge energy. Therefore, an experimental-analytical approach of discharge energy efficiency was analyzed. The main input parameters for controlling the discharge energy are discharge current and discharge duration. The EDM process is monitored considering the two output machining performance, i.e., material removal rate and surface roughness, which are important for increasing productivity and quality. We modeled the energy efficiency of electrical discharge machining by the use of genetic algorithm. With this action an attempt was made to find even more precise dependence of discharge energy parameters with machining performance. Finally, this was followed by optimization of the discharge energy efficiency in EDM process using multi-objective approach. Evolutionary two-objective optimization is leading to the set of optimal solutions for the discharge energy considering the two machining parameters. Using this set of solutions, EDM discharge energy parameters can be selected to achieve high material removal rate with good surface roughness.
Influence of discharge energy on machining characteristics in EDM
Marin Gostimirovic,Pavel Kovac,Milenko Sekulic,Branko Skoric 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.1
The machining characteristics of electrical discharge machining (EDM) directly depend on the discharge energy which is transformed into thermal energy in the discharge zone. The generated heat leads to high temperature, resulting in local melting and evaporation of workpiece material. However, the high temperature also impacts various physical and chemical properties of the tool and workpiece. This is why extensive knowledge of development and transformation of electrical energy into heat is of key importance in EDM. Based on the previous investigations, analytical dependence was established between the discharge energy parameters and the heat source characteristics in this paper. In addition, the thermal properties of the discharged energy were experimentally investigated and their influence on material removal rate, gap distance, surface roughness and recast layer was established. The experiments were conducted using copper electrode while varying discharge current and pulse duration. Analysis and experimental research conducted in this paper allow efficient selection of relevant parameters of discharge energy for the selection of most favorable EDM machining conditions.