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Sensitive NDE of Small Fatigue Cracks
Saka, Masumi 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.1
Some techniques developed recently for sizing small fatigue cracks are described. One is an ultrasonic technique which deals with a small closed crack, where both the stress closing the crack and the crack size are determined by analyzing inverse problem, Here, difficulties encountered in NDE of closed cracks by usual ultrasonic techniques are summarized in advance. Secondly, the closely coupled probes potential drop (CCPPD) technique, which is based on d-c potential drop measurement, is explained for sizing small cracks. The CCPPD technique is not affected by crack closure. Finally, a discussion is given on NDE of materials degradation in conjunction with sensitive NDE of small cracks.
An Outlook of Research and Development for the Future Air Traffic Management in Japan
Sakae NAGAOKA 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
Air traffic management (ATM) is defined in an ICAD document as the dynamic, integrated management of air traffic and airspace - safely, economically and efficiently - through the provision of facilities and seamless services in collaboration with all parties. The concept presents the ICAD vision of an integrated, harmonized and globally interoperable ATM system. The planning horizon is up to and beyond 2025. Europe and the United States have developed their own visions/programs for the future ATM systems, i.e., SESAR (Single European Sky A TM Research) and NetGen (Next Generation Air Transportation System), respectively. These programs are based on the concept shown in the ICAD document. In Japan, the Electronic Navigation Research Institute (ENRJ), which is a core research organization of ATM systems, has recently developed its long term research and development (R & D) roadmap. It was developed taking into account those visions and conditions surrounding Japan. Reviewing the visions of ICAD, SESAR and NextGen, ENRI assumed that a key component of the future ATM will be the 4-dimentional trajectory based operation. This paper describes the shift from the current air traffic control (ATC) to the future ATM. Then, the operational concept of the future ATM and R&D towards future ATM systems are explained. Finally ENRI's long term vision and its R&D roadmap are briefly described.
RECENT DEVELOPMENT OF TECHNIQUES FOR SENSITIVE NONDESTRUCTIVE EVALUATION OF CRACKS
Saka, M. ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
Recently developed techniques for sensitive nondestructive evaluation (NDE) of cracks are reviewed. Ultrasonic testing, d-c potential drop technique and microwave imaging for sensitive NDE of an isolated crack and also multiple cracks are explained.
Saka, Jelili Olaide,Adesehinwa, Akinyele Oluwatomisin Kingsley,Oyegbami, Ajoke,Omole, Adeboye Joseph,Cho, Gyoung-rae,Seol, Young-joo,Kim, Chongdae,Kim, Sung Woo,Jeon, Iksoo The Korean Society of Poultry Science 2017 韓國家禽學會誌 Vol.44 No.4
Chicken production remains the foremost endeavor in the Nigerian livestock industry. However, disease incidence has been a major constraint on the growth of this subsector. This study assessed health management practices and disease incidence in smallholder chicken production enterprise in Southwest Nigeria using data from a farm survey of 240 farmers selected using a multistage sampling technique from 5 of 6 states in Southwest Nigeria. The study showed that vaccination was given by 96.8% of the famers, 97.8% dewormed their chickens, and 92.9% disinfected the coops against diseases. However, 37% of the farmers regularly consulted veterinarians, 25.7% consulted them during disease outbreaks, and 34.2% occasionally consulted veterinarians. Infectious bursal disease (IBD), coccidiosis, and chronic respiratory disease (CRD) were the major diseases reported by 17.1%, 12.9%, and 7.1% of the farmers, respectively. Mortality rate was 37.8%, although this varied with disease. However, there was a growth of 157.4% in stock size between the establishment of the farms and the survey period.