5259 research outputs found
Sort by
Possibility of cryopreservation of medaka eggs using liquid meniscus
Get PDFThe First Pacific Rim Thermal Engineering Conference (PRTEC2016), Marchi 13-17, 2016, Waikoloa Beach Marriott Resort & Spa Hawaii's Big Island, USAThe cryopreservation of fish eggs is an important subject in the field of fishery and preservation of biological species. Thus far, there has been no success in the preservation of fish eggs because of the large size of the eggs and the thick external shell. This paper discusses the effectiveness of using the liquid meniscus formed around the egg for protecting its morphology. Freezing and thawing experiments of medaka eggs were performed under different freezing conditions, and the hatching rate of the egg was examined. Before freezing, the eggs were dehydrated at room temperature in order to reduce the effect of volume expansion caused by freezing. It was confirmed that 100% of the eggs dehydrated by 15% or less were successfully hatched. In the freezing process, a medaka egg was placed on a hydrophobic cooling plate and a thin liquid meniscus was formed around the hydrophilic egg surface. An aqueous solution of trehalose was used as the liquid meniscus as well as a cryoprotectant to prevent damage caused by freezing. Cryopreservation of the egg was not successfully performed for all processes, including intracellular freezing; however, 80% of the eggs were alive even after freezing of the external meniscus. Therefore, it is confirmed that the liquid meniscus is effective for the cryopreservation of the external shell. The liquid meniscus can reduce the physical stress due to extracellular ice growth. Moreover, since the liquid meniscus system has a low heat capacity, the thermal process is easy to control compared to the conventional method. We concluded that the present method can be used for the cryopreservation of fish eggs
非都市部における既設の基盤設備を利用した低コストな無線情報ネットワーク
No full text九州工業大学博士学位論文 学位記番号:情工博甲第317号 学位授与年月日:平成28年9月23日1 Introduction||2 Related Work||3 Message Transmission Scheduling on TandemMulti-hop LossyWireless Links||4 Comparison of DTN Routing Protocols in Realistic Scenarios||5 Spray Router with Node Location Dependent Remaining-TTLMessage Scheduling in DTNs||6 Spray and Hop Distance Routing Protocol in Multiple-island DTN Scenarios||7 Concluding remark
Design and Testing of a Lean Satellite Electrical Power Subsystem, HORYU-IV
Get PDF九州工業大学博士学位論文 学位記番号:工博甲第426号 学位授与年月日:平成28年9月23日1 Introduction||2 EPS design tools and fault analysis||3 Design of HORYU-IV Electrical Power Subsystem||4 Testing of HORYU-IV EPS||5 In-orbit data analysis of HORYU-IV Electrical Power Subsystem and conclusionHORYU-IV is a lean satellite weighing 12 kg designed at the Kyushu Institute of Technology. It is launched with the ASTRO-H in February 2016 as a piggyback on an H-IIA rocket. The main mission of HORYU-IV is to acquire on-orbit data of discharge phenomena occurring on high-voltage solar arrays. An electrical power subsystem (EPS) is one of the HORYU-IV bus subsystems. The function of the EPS is to provide uninterrupted power to all subsystems during the satellite’s lifetime. High reliability, high efficiency and simplicity are the main requirements to be considered in the design of an EPS. Generally, an EPS consists of solar arrays, rechargeable batteries, and a power control and distribution unit (PCDU). A peak power tracking topology is preferred to extract the maximum power generated by the solar arrays. The extra energy is stored in nickel-metal hydride batteries. The simple design and usage of available commercial-off-the-shelf components are the main features of the PCDU which controls the battery charging and load voltage regulation. Functional tests under different operating conditions were carried out on the designed EPS to qualify its performance. The aim of this research is to develop EPS with the “Lean” concepts and methods to achieve low cost and fast delivery subsystem. All design details have been explained and the test results have been analyzed. The in-orbit data have been analyzed to verify the design
溶融銅－チタン、アルミニウム－チタン、アルミニウム－シリコン合金と炭素系材料のぬれおよび界面反応
Get PDF九州工業大学博士学位論文 学位記番号:生工博甲第254号 学位授与年月日:平成28年3月25日1 Preface||2 Wettability and Interfacial Reaction between Cu-Ti Alloys and Graphite||3 Wettability and Interfacial Reaction between Al-Ti Alloys and Graphite||4 Wettability and Interfacial Reaction between Al-Si Alloys and Graphite||5 Composite of Carbon Fiber and Cu-Ti, Al-Ti and Al-Si Alloys||6 Surface Tension of Liquid Cu-Ti, Al-Ti and Al-Si Alloys||7 Summary and Future Wor
Implementation of Near Magnetic Field 3D Imaging System
Get PDF電力技術／電力系統技術／半導体電力変換技術合同研究会, 3月8日-9日, 2016年,
九州工業大学 戸畑キャンパス, 福岡県 A near magnetic field 3D imaging system is developed in this paper. The distance from magnetic field source and the frequency dependency of the magnetic field strength distribution are investigated. As a result, the performance of the proposed system is verified and the specific technique of the effective magnetic field source is examined
Verification of Measurement Accuracy of Near Magnetic Field 3D Imaging System
Get PDF電力技術／電力系統技術／半導体電力変換技術合同研究会, 3月8日-9日, 2016年,
九州工業大学 戸畑キャンパス, 福岡県 In order to develop a near magnetic field 3D imaging system, measurement accuracy of the system is verified in this paper. The measurement accuracy of the proposed system is clarified. Moreover, the distance from magnetic field source and the frequency dependency of the magnetic field strength distribution are examined
