Space Tribology in Japan

1996 ◽  
Vol 210 (3) ◽  
pp. 173-178 ◽  
Author(s):  
N Kawashima ◽  
N Hiraoka ◽  
Y Yoshii
Keyword(s):  
Research And Development ◽  
Space Station ◽  
Space Use ◽  
Ball Bearings ◽  
Test Results ◽  
Sliding Bearings ◽  
Space Tribology ◽  
The Us ◽  
Mechanical Elements ◽  
Japanese Experimental Module

This paper traces research and development in the field of lubrication technology for various mechanical elements. Japan is now in the process of developing the Japanese experimental module (JEM), one component of the US Space Station. This paper therefore emphasizes results relating to mechanical elements that will appear in JEM mechanisms. Methods of lubricating ball-bearings, sliding bearings, ball screws and gears for space use are described and some test results are given.

Endurance and Failure Characteristic of Main-Shaft Jet Engine Bearing at 3 × 106 DN

1976 ◽  
Vol 98 (4) ◽  
pp. 580-585 ◽  
Author(s):  
E. N. Bamberger ◽  
E. V. Zaretsky ◽  
H. Signer
Keyword(s):  
Ball Bearings ◽  
Main Shaft ◽  
Test Results ◽  
Jet Engine ◽  
Material Life ◽  
Thrust Load ◽  
Inner Race ◽  
Continuous Running ◽  
Life Factor ◽  
Engine Bearing

Groups of thirty 120-mm bore angular-contact ball bearings were endurance tested at a speed of 12 000 and 25 000 rpm (1.44 × 106 and 3.0 × 106 DN) and a thrust load of 66 721 N (5000 lb). The bearings were manufactured from a single heat of VIM-VAR AISI M-50 steel. At 1.44 × 106 and 3.0 × 106 DN, 84 483 and 74 800 bearing test hours were accumulated, respectively. Test results were compared with similar bearings made from CVM AISI M-50 steel run under the same conditions. Bearing lives at speeds of 3 × 106 DN with the VIM-VAR AISI M-50 steel were nearly equivalent to those obtained at lower speeds. A combined processing and material life factor of 44 was found for VIM-VAR AISI M-50 steel. Continuous running after a spall has occurred at 3.0 × 106 DN can result in a destructive fracture of the bearing inner race.

scholarly journals SCIENTIFIC AND TECHNOLOGICAL PROBLEMS OF THE DEVELOPMENT OF CYBERSECURITY TECHNOLOGIES ABROAD

2020 ◽  
pp. 169-177
Author(s):  
D.B. Izyumov ◽  
E.L. Kondratyuk
Keyword(s):  
Research And Development ◽  
Department Of Defense ◽  
Smart Devices ◽  
Development Work ◽  
Research Projects ◽  
Regulatory Documents ◽  
The Us ◽  
Significant Research ◽  
Cloud Environments

The article discusses the concept of cybersecurity and its features, presents a list of US regulatory documents in the field of cyberspace and cybersecurity, as well as significant research and development work and programs in the field of development of cybersecurity technologies conducted by the Department of Advanced Research Projects of the US Department of Defense (DARPA). The most common foreign technologies used to protect computers, smart devices, routers, networks and cloud environments, as well as the main scientific and technological problems of the development of cybersecurity technologies, are summarized.

scholarly journals Pengembangan media pembelajaran AIKO berbasis aplikasi android dari PowerPoint materi pertumbuhan dan pembangunan ekonomi kelas XI

2021 ◽  
Vol 1 (8) ◽  
pp. 735-745
Author(s):  
Nazilatul Muharrami Nasifa ◽  
Ro’ufah Inayati
Keyword(s):  
Research And Development ◽  
Growth And Development ◽  
Test Results ◽  
Economic Growth And Development ◽  
Technological Developments ◽  
Android Applications ◽  
Addie Model ◽  
Feasibility Test ◽  
Alternative Solutions ◽  
Group Trial

Abstract Being in the industrial era 4.0, teachers as educators are required to understand technology more than their students. Teachers need to understand students' needs for technological developments so that classroom learning runs well. The development of learning media is one of the alternative solutions that can be used by teachers to meet the needs of students for technological developments. The purpose of research and development is to produce learning media products based on android applications from Microsoft PowerPoint on material for economic growth and development for class XI. This research and development uses the ADDIE model. The results of the research and development were obtained from the results of the feasibility test through filling out validation questionnaires with validators of material experts (lecturers), media experts (lecturers), learning practitioners (economics teachers), and test results with users (students) through small group trials and large group trial. The average result of the validation and testing as a whole obtained a score of 92.177 percent so that this research and development product is very valid and very feasible to be used as a learning medium. Abstrak Berada pada era industri 4.0 guru sebagai pendidik diharuskan untuk memahami teknologi lebih dari siswanya. Guru perlu memahami kebutuhan siswa atas perkembangan teknologi agar pembelajaran di kelas berjalan dengan baik. Pengembangan media pembelajaran menjadi salah satu solusi alternatif yang bisa digunakan oleh guru untuk memenuhi kebutuhan siswa atas perkembangan teknologi. Tujuan dari penelitian dan pengembangan adalah untuk menghasilkan produk media pembelajaran berbasis aplikasi android dari Microsoft PowerPoint pada materi pertumbuhan dan pembangunan ekonomi kelas XI. Penelitian dan pengembangan ini menggunakan model ADDIE. Hasil dari penelitian dan pengembangan diperoleh dari hasil uji kelayakan melalui pengisian kuisioner validasi bersama validator ahli materi (dosen), ahli media (dosen), praktisi pembelajaran (guru ekonomi), dan hasil uji coba bersama pengguna (siswa) melalui uji coba kelompok kecil dan uji coba kelompok besar. Rata-rata asil validasi dan uji coba secara keseluruhan memperoleh skor sebesar 92,177 persen sehingga produk penelitian dan pengembangan ini sangat valid dan sangat layak untuk digunakan sebagai media pembelajaran.

scholarly journals ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI IMPOR BERAS DI INDONESIA

2019 ◽  
Vol 11 (2) ◽  
pp. 183-201
Author(s):  
Yona Namira ◽  
Iskandar Andi Nuhung ◽  
Mudatsir Najamuddin
Keyword(s):  
Time Series ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Time Series Data ◽  
Series Data ◽  
Test Results ◽  
The Us ◽  
Rice Prices ◽  
Us Dollar ◽  
Spss Software

This study aims to 1) identify factors that affect the import of rice in Indonesia 2) analyze the influence of these factors on imports of rice in Indonesia. The data used in this research are time series data from 1994 to 2013 from the Central Statistics Agency (BPS), the Ministry of Agriculture, Ministry of Commerce, National Logistics Agency (Bulog), and Bank Indonesia. Multiple linear regression through SPSS software version 21 was employed to analyze the data. The test results together indicated the variables of productions, consumptions, stocks of rice, domestic rice prices, international rice prices and the rupiah against the US dollar affect the imports of rice in Indonesia.

scholarly journals The Results Presentation of The Test Plants As A Natural Indicator of The Test Compounds of The Acid-Base Balance In the Teaching Materials of The Atlas to Train Scientific Reasoning Students

2021 ◽  
Vol 2 (3) ◽  
pp. 354-364
Author(s):  
Raddina Aprilia Putri ◽  
Endang Susantini ◽  
Titik Taufikurohmah
Keyword(s):  
Research And Development ◽  
Scientific Reasoning ◽  
Probabilistic Reasoning ◽  
Test Results ◽  
Acid Base Balance ◽  
Acid Base ◽  
Teaching Materials ◽  
Post Test ◽  
Base Balance ◽  
Theoretical Reasoning

The type of research applied in this research is Research and Development. The development model used is Dick and Carrey. The purpose of this research and development is to design an Atlas and apply it to train the students' scientific reasoning abilities. Atlas is a teaching materials developed and applied to high school / vocational / MA level students. The sample chosen for the implementation of the Atlas of teaching materials was grade X of VOCATIONAL Health Yannas Husada Bangkalan students. The application of plants as natural indicators of acid-base tests is the material presented in the developed Atlas. Plants selected as indicators are tested first to be presented in the Atlas. Atlas is a teaching material that can convey information related to the use of natural indicators of the acid-base test to train the students' scientific reasoning skills. The four indicators of scientific reasoning that are trained are Theoretical Reasoning, Proportional Reasoning, Probabilistic Reasoning, and Correlational Reasoning. The data shows the students' scientific reasoning ability on the post-test results, as many as 20% of students are on the high criteria, 60% are moderate criteria, and 20% are still on the low criteria from the post-test results. The post-test result data is quite increased when compared to the pretet results, which 100% of students are in the low criteria.

Production of Diffusion Flames in the Near Extinction Limit Regime Using a Hele-Shaw Apparatus in a Simulated Low Gravity Environment

2001 ◽  
Author(s):  
Lisa M. Oravecz-Simpkins ◽  
Indrek S. Wichman
Keyword(s):  
Diffusion Flames ◽  
Space Station ◽  
Scaling Analysis ◽  
Test Results ◽  
Low Gravity ◽  
Flame Instability ◽  
Extinction Limit ◽  
Maximum Test ◽  
Near Extinction ◽  
Flame Instabilities

Abstract A Hele-Shaw apparatus that produced spreading diffusion flames in the near extinction limit was designed and constructed. A scaling analysis was used to determine the maximum test section height for which effects of gravity could be neglected. Preliminary results showed that this apparatus could be used to produce flame instabilities which resemble drop tower test results from NASA [1,2] and other diffusion flame instability studies [3,4,5,6]. Therefore, the Hele-Shaw apparatus is useful for studying flames in a simulated low gravity environment. Additional unstable behaviors seen in the device, such as flame pulsing and spreading blue cusps, not in the NASA testing further supported the need for investigations during longer microgravity times on the International Space Station. The initial testing was only used to gain an observable region of unstable flames. Further studies will be directed at explaining and quantifying specific behaviors with test conditions.

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