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RISS 인기검색어
- 검색키워드
- 저자 : Luhur, Muhammad Ramzan (검색결과 4 건)
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A review of the state-of-the-art in aerodynamic performance of horizontal axis wind turbine
Luhur, Muhammad Ramzan,Manganhar, Abdul Latif,Solangi, K.H.,Jakhrani, Abdul Qayoom,Mukwana, Kishan Chand,Samo, Saleem Raza Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.22 No.1
The paper presents the state-of-the-art in aerodynamic performance of the modern horizontal axis wind turbine. The study examines the different complexities involved with wind turbine blade aerodynamic performance in open atmosphere and turbine wakes, and highlights the issues which require further investigations. Additionally, the latest concept of smart blades and frequently used wind turbine design analysis tools have also been discussed. The investigation made through this literature survey shows significant progress towards wind turbine aerodynamic performance improvements in general. However, still there are several parameters whose behavior and specific role in regulating the performance of the blades is yet to be elucidated clearly; in particular, the wind turbulence, rotational effects, coupled effect of turbulence and rotation, extreme wind events, formation and life time of the wakes.
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Luhur Muhammad Sadewo Panghudi(루흐르 무하마드 사데오 팡후디),Geum-ji Jang(장금지),Kwang-Sun Ryu(류광선) 한국전지학회 2022 한국전지학회지 Vol.2 No.1
NASICON계 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) 산화물계 고체전해질은 양호한 기계적 물성, 높은 Li<SUP>+</SUP> 이동수, 우수한 전기화학적 및 열적 안정성을 나타낸다. LATP의 이온전도도를 높이기 위해 수용성 바인더를 도입하였다. 은은 개질된 고체 방법을 사용하여 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 고체 전해질에 성공적으로 치환되었다. Pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 도 치환 전 후를 비교하기 위해 합성되었다. X-ray 회절 패턴은 바인더의 첨가 후 피크의 이동을 보였으며 이는 전해질에 대한 바인더의 영향으로 나타났다. 은으로 개질된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃에서 넓고 증가된 피크가 발견되었다. 또한 46.5° 부근에서 작은 새로운 피크가 나타났는데, 이는 LATP에 은이 성공적으로 치환되었음을 나타낸다. 이온전도도 측정은 EIS (Electrochemical Impedance Spectroscopy)로 수행되었으며 고체 전해질 용 바인더로서 1% PVA가 사용된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃가 4.65 × 10<SUP>-5</SUP> S/cm의 가장 높은 값을 나타낸다. NASICON-type Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) oxide-based solid electrolyte shows the favorable mechanical property, high Li+ transfer number, and excellent electrochemical and thermal stability. Water-soluble binders were introduced in order to increase the ionic conductivity of LATP. Silver was successfully substituted to the Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ solid electrolyte using a modified solid-state method for all-solid-state lithium batteries (ASSLBs). The pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ was also synthesized for comparison before and after silver modification. X-ray diffraction patterns showed the peak shifting after the addition of binders were shown as the effect of binders on the electrolyte. A similar peak with slightly increased and peak broadening for silver-modified LATP appeared after the addition of silver. There are also a small new peak appeared at around 46.5° theta degree indicating that the modification of silver on LATP has successfully synthesized. The ionic conductivity measurement was conducted by Electrochemical Impedance Spectroscopy (EIS) and revealed LATP with 1% PVA is currently displaying a highest value of 4.65 × 10<SUP>-5</SUP> S/cm as binder for solid electrolytes.
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A review of the state-of-the-art in aerodynamic performance of horizontal axis wind turbine
Muhammad Ramzan Luhur,Abdul Latif Manganhar,K.H. Solangi,Abdul Qayoom Jakhrani,Kishan Chand Mukwana,Saleem Raza Samo 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.22 No.1
The paper presents the state-of-the-art in aerodynamic performance of the modern horizontal axis wind turbine. The study examines the different complexities involved with wind turbine blade aerodynamic performance in open atmosphere and turbine wakes, and highlights the issues which require further investigations. Additionally, the latest concept of smart blades and frequently used wind turbine design analysis tools have also been discussed. The investigation made through this literature survey shows significant progress towards wind turbine aerodynamic performance improvements in general. However, still there are several parameters whose behavior and specific role in regulating the performance of the blades is yet to be elucidated clearly; in particular, the wind turbulence, rotational effects, coupled effect of turbulence and rotation, extreme wind events, formation and life time of the wakes.
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Corporate Entrepreneurship and Business Performance of Logistic Companies in Indonesia
Krisada Chienwattanasook,Samanan Wattanapongphasuk,Andi Luhur Prianto,Kittisak Jermsittiparsert 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.3
Indonesian logistic industry is growing rapidly and contributing to the gross-domestic product (GDP). However, Indonesian logistic companies are facing various challenges. Corporate entrepreneurship is one of the crucial challenges facing by logistic companies. This problem is a constraint in the growth of these companies. Therefore, objective of this study is to address the relationship of corporate entrepreneurship and business performance among Indonesian logistic companies. Quantitative approach is used to accomplish this objective. A questionnaires survey was selected to collect the data from logistic employees. Results of the study found that corporate entrepreneurship has major role in logistic business performance. Time availability, management support and organization boundaries have important role to enhance logistic business performance. Additionally, work discretion increases the positive effect of corporate entrepreneurship and business performance. Therefore, logistic companies should focus on corporate entrepreneurship to resolve various issues related to entrepreneurship.
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