• 제목/요약/키워드: National physical laboratory

검색결과 648건 처리시간 0.032초

Simple and Sensitive Determination of Baclofen in Human Plasma by Column-Switching and Semi-Micro High-Performance Liquid Chromatography

  • Ban, Eun-Mi;Ko, Hye-Ran;Kim, Chong-Kook
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.284.2-284.2
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    • 2003
  • Using a column-switching technique. highly sensitive and selective semi-micro high-performance liquid chromatographic (HPLC) method has been developed for the determination of baclofen in human plasma. Following precipitation of plasma sample containing baclofen with zinc sulfate-acetonitrile, samples were directly injected on to the system. (omitted)

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New Frontiers in Hard Materials Testing

  • Gee, Mark;Gant, Andrew;Morrell, Roger;Roebuck, Bryan
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.885-886
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    • 2006
  • Significant advances in mechanical testing for hard materials are discussed in this paper. There are three specific areas that are covered. In the measurement of fracture toughness factors such as the control of slow crack growth to produce strating cracks, and evaluating reproducibility and repeatability of tests have been recently examined. The miniaturization of tests reduces the amount of material that is used in testing, improves the throughput of tests, and also improves cost effectiveness. New techniques such as stepwise testing and micro scratch testing have contributed to significant additions to the knowledge of the wear mechanisms that operate in these materials.

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Influence of Physical Load on the Stability of Organic Solar Cells with Polymer : Fullerene Bulk Heterojunction Nanolayers

  • Lee, Sooyong;Kim, Hwajeong;Kim, Youngkyoo
    • Current Photovoltaic Research
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    • 제4권2호
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    • pp.48-53
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    • 2016
  • We report the effect of physical load on the stability of organic solar cells under physical loads. The active layers in organic solar cells were fabricated with bulk heterojunction films (BHJ) films of poly (3-hexylthiophene) and phenyl-$C_{61}$-butyric methyl ester. The loading time was varied up to 60 s by keeping the physical load constant. Results showed that the open circuit voltage was not influenced by the physical load but other solar cell parameters were sensitive to the loading time. The fill factor was very slightly increased at 15 s, while short circuit current density was well kept for 30 s. The power conversion efficiency was reasonably maintained for 45 s but became significantly decreased by the continuous loading for 60 s.

DMRUT-MCDS: Discovery Relationships in the Cyber-Physical Integrated Network

  • Lu, Hongliang;Cao, Jiannong;Zhu, Weiping;Jiao, Xianlong;Lv, Shaohe;Wang, Xiaodong
    • Journal of Communications and Networks
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    • 제17권6호
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    • pp.558-567
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    • 2015
  • In recent years, we have seen a proliferation of mobile-network-enabled smart objects, such as smart-phones and smart-watches, that form a cyber-physical integrated network to connect the cyber and physical worlds through the capabilities of sensing, communicating, and computing. Discovery of the relationship between smart objects is a critical and nontrivial task in cyber-physical integrated network applications. Aiming to find the most stable relationship in the heterogeneous and dynamic cyber-physical network, we propose a distributed and efficient relationship-discovery algorithm, called dynamically maximizing remaining unchanged time with minimum connected dominant set (DMRUT-MCDS) for constructing a backbone with the smallest scale infrastructure. In our proposed algorithm, the impact of the duration of the relationship is considered in order to balance the size and sustain time of the infrastructure. The performance of our algorithm is studied through extensive simulations and the results show that DMRUT-MCDS performs well in different distribution networks.

Effects of Kinect-Based Mixed Reality Device on Physical Function and Quality of Life in Breast Cancer Survivors : A randomized controlled trial

  • Byung-Gul Lim;Xinxing Li;Yun-Ho Sung;Si-Woo LEE;Hyun-Jun Kim;Wook Song
    • 대한통합의학회지
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    • 제11권2호
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    • pp.49-60
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    • 2023
  • Purpose : We aimed to evaluate the impact of a exercise with kinect-based mixed reality device (KMR) on physical function, upper extremity disability, fatigue, and quality of life in breast cancer survivors. We hypothesized that this exercise program would improve physical function, physical activity, fatigue, and quality of life. Methods : Thirty-nine breast cancer survivors were randomized to either the KMR exercise group (KE) or the home stretch group (HS). The KE participated in 8 weeks of exercise, exercising 3 times per week, while the HS performed 8 weeks of stretching exercises, also 3 times per week. Before and after the intervention period, participants underwent assessments of physical function, including body composition, chester step test (CST), and hand grip strength (HGS). Additionally, participants completed questionnaires including the international physical activity questionnaire (IPAQ), disabilities of the arm, shoulder and hand (DASH) questionnaire, and functional assessment of cancer therapy-breast (FACT-B) questionnaire to measure their physical activity levels, upper extremity disability, and quality of life, respectively. Results : Overall, significant improvements were observed in several shoulder movements, body weight, and physical activity, with no significant interaction effects between groups and time. Furthermore, there was a significant group by time interaction for body weight, left flexion, right flexion, right abduction, and left adduction, as well as for upper extremity disability (K-DASH) and quality of life (FACT-B). Conclusion : In conclusion, the KMR exercise program was found to be effective at improving physical function, upper extremity disability, quality of life, and overall well-being in breast cancer survivors. The significant improvements observed in multiple measures and the significant group by time interactions for various outcomes highlight the potential benefits of this KMR exercise program in promoting a better quality of life for breast cancer survivors.

운동 후 스포츠 마사지가 피로 회복에 미치는 영향 (The Effect of Sports Massage on Physical Fatigue after Exercise)

  • 황석연;김동규;손창섭;이남진;박종배;조정희;김윤배;배형준
    • 대한임상검사과학회지
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    • 제36권2호
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    • pp.252-257
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    • 2004
  • The purpose of this study was to investigate the variation in constituent element of blood between the massage group and non-massage group in the period of convalescence after giving intense physical exercise for ten T'ae-Kwondo martial artists. In the variations of red blood cells, white blood cells, hematocrit, hemoglobin and blood platelet, levels decreased during the rest time after physical exercise, but the subjects in the massage group showed lower tendency than the subjects in the non-massage group after physical exercise. The variation of calcium showed an ascension tendency in the massage group after physical exercise. Creatine phosphokinase was increased after physical exercise, but it showed a tendency of rapid decrease in the massage group. Lactic acid showed a variation increase after physical exercise. It showed a tendency of decrease during the rest time in the non-massage group, but it was increased after sports massage. The variation of blood glucose was increased after physical exercise. It was maintained in the massage group after physical exercise in contrast to the non-massage group whose levels decreased during the rest time.

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QA/QC Techniques for the Automated Hydrocarbon Monitoring Natwork in the UK

  • Rod Robinson;Tony andrews;David Butterfield;Paul Quincey
    • Journal of Korean Society for Atmospheric Environment
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    • 제17권E1호
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    • pp.25-33
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    • 2001
  • This paper presents an overview of the UK Hydrocarbon Monitoring Network and summarises some of the lessons learnt from running and automated VOC monitoring network in th UK. The paper will describe the operation of the network and the Quality Control and Quality Assurance (QA/QC) procedures used to ensure that the data qality objectives are met. The provision of accurate measurements of ambient air pollutant concentrations is a valuable and high-profile service of Governments, assisting policy decisions and allowing members of the public to be well-informed. The need for such measurements has been increased in the UK by the National Air Quality Strategy and European Air Quality Directives, with the National Networks playing a central role in delivering the information. The Hydrocarbon Network provides measurements directly in support of monitoring requirements for benzene and 1,3-butadiene, and of 23 other hydrocarbon species important for their role in ozone and secondary particulate formation.

Thermomechanical Properties of Carbon Fibres and Graphite Powder Reinforced Asbestos Free Brake Pad Composite Material

  • Thiyagarajan, P.;Mathur, R.B.;Dhami, T.L.
    • Carbon letters
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    • 제4권3호
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    • pp.117-120
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    • 2003
  • Asbestos is being replaced throughout the world among friction materials because of its carcinogenic nature. This has raised an important issue of heat dissipation in the non-asbestos brake pad materials being developed for automobiles etc. It has been found that two of the components i.e. carbon fibres as reinforcement and graphite powder as friction modifier, in the brake pad material, can playa vital role in this direction. The study reports the influence of these modifications on the thermal properties like coefficient of thermal expansion (CTE) and thermal conductivity along with the mechanical properties of nonasbestos brake pad composite samples developed in the laboratory.

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