• Title/Summary/Keyword: Resistance effect

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Effect of Thermal History on Pitting Corrosion of High Nitrogen and Low Molybdenum Stainless Steels

  • Kim, Kwangsik;Chang, Hyunyoung;Kim, Youngsik
    • Corrosion Science and Technology
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    • v.2 no.2
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    • pp.75-81
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    • 2003
  • Chromium, molybdenum. and nitrogen are very important alloying elements in stainless steels and its effect was approved in pitting resistance equivalent (PRE) equations and many experimental results. However, Cr can improve the corrosion resistance, but facilitate the formation of sigma phase. Also. Mo has the same effect in stainless steels. If Cr and Mo are added at high amount to increase the corrosion resistance of stainless steel, corrosion resistance in annealed alloys can be improved, but in case of welding or aging heat treatment. its resistance will be drastically decreased. In this work, increasing Cr and N contents but decreasing Mo than the commercial alloys made the experimental alloys. Typical alloys are 25Cr-4.5Mo-0.43N alloy, 27Cr-4.7Mo-0.4N alloy, 27Cr-5.3Mo-0.25N alloy, 32Cr-2.6Mo-0.36N alloy. After annealing and aging heat treatment, microstructures, anodic polarization test, and pitting corrosion test were performed. Annealed alloys showed $100^{\circ}C$ of CPT and aged alloys showed the different tendency depending upon Cr and Mo contents(SFI)

End shape and rotation effect on steel pipe pile installation effort and bearing resistance

  • Saleem, Muhammad A.;Malik, Adnan A.;Kuwano, Jiro
    • Geomechanics and Engineering
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    • v.23 no.6
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    • pp.523-533
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    • 2020
  • The current study focuses on the effect of the end shape of steel pipe piles on installation effort and bearing resistance using the pressing method of installation under dense ground conditions. The effect of pile rotation on the installation effort and bearing resistance is also investigated. The model steel piles with a flat end, cone end and cutting-edge end were used in this study. The test results indicated that cone end pile with the pressing method of installation required the least installation effort (load) and showed higher ultimate resistance than flat and cutting-edge end piles. However, pressing and rotation during cutting-edge end pile installation considerably reduces the installation effort (load and torque) if pile penetration in one rotation equal to the cutting-edge depth. Inclusion of rotation during pile installation reduces the ultimate bearing resistance. However, if penetration of the cutting-edge end pile equal to the cutting-edge depth in one rotation, the reduction in ultimate resistance can be minimized. In comparing the cone and cutting-edge end piles installed with pressing and rotation, the least installation effort is observed in the cutting-edge end pile installed with penetration rate equal to the cutting-edge depth per rotation.

The Effects of Ginsenoside Re on High-Fat Diet induced Insulin Resistance in Muscle (Ginsenoside Re가 골격근의 고지방식 유도 인슐린 저항성에 미치는 영향)

  • Jung, Su-Ryun
    • Korean Journal of Exercise Nutrition
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    • v.14 no.2
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    • pp.75-80
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    • 2010
  • We evaluated the effect of the ginsenoside Re on insulin resistance of glucose transport in muscles of rats made insulin resistant with a high fat diet. After a week of adaptation period to the laboratory environment, 40 male wistar rats were randomly assigned into 2 groups (Chow diet group; CD, n = 20, High fat diet group; HFD, n = 20). After 5-week of high fat diet, Food was removed after 6:00 PM the day before the experiment. The following morning, rats were anesthetized by an intraperitoneal injection of pentobarbital sodium (50 mg/kg body wt), and the soleus muscles were removed. Before incubation, the soleus muscle was split longitudinally into strips with an average weight of 15~20 mg. After the muscle dissection was completed, the abdominal cavity was opened, and the epididymal, mesenteric, and retroperitoneal fat pads were removed and weighed. Treatment of muscles with ginsenoside Re alone had no effect on glucose transport. The high fat diet resulted in ~50% decreases glucose transport rate in soleus muscles. Treatment of muscles with ginsenoside Re in vitro for 90 min completely reversed the high fat diet-induced insulin resistance of glucose transport in soleus muscles. This effect of ginsenoside Re is specific for insulin stimulated glucose transport, as Re treatment did not reverse the high fat diet-induced resistance of skeletal muscle glucose transport to stimulation by contraction. Our results show that the ginsenoside Re induces a remarkably rapid reversal of high fat diet-induced insulin resistance of muscle glucose transport.

A study on the impedance effect of nonvolatile memory devices (비휘발성 기억소자의 저항효과에 관한 연구)

  • 강창수
    • Electrical & Electronic Materials
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    • v.8 no.5
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    • pp.626-632
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    • 1995
  • In this paper, The effect of the impedances in SNOSFET's memory devices has been developed. The effect of source and drain impedances measured by means of two bias resistances - field effect bias resistance by inner region, external bias resistance. The effect of the impedances by source and drain resistance shows the dependence of the function of voltages applied to the gate. It shows the differences of change in source drain voltage by means of low conductance state and high conductance state. It shows the delay of threshold voltages. The delay time of low conductance state and high conductance state by the impedances effect shows 3[.mu.sec] and 1[.mu.sec] respectively.

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A Study on the Technological Innovation and Introduction of SCM System of SMEs' Industry Using the Innovation Resistance Model (혁신저항모델을 활용한 중소기업 기술혁신에 따른 SCM시스템 도입 영향 연구)

  • Oh, Yongmin;Boo, Jeman
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.44 no.3
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    • pp.165-175
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    • 2021
  • As the advent of the Fourth Industrial Revolution and Information Age, companies are in the state of infinite competition due to the rapidly changing technological environment and fierce competition. In this situation companies are making efforts to gain the competitive advantage by introducing information systems. Supply Chain Management (SCM) is considered a method to gain a competitive edge in rapid change. In fact, companies that already have introduced the SCM system are achieving company renovation with positive effects such as increase of sales stock reduction on-time delivery cost reduction and improved efficiency. This study was started to investigate the resistance that occurs in introducing the SCM system for small and medium-sized manufacturing industries that have not yet introduced the SCM system despite the importance of the SCM system, and to check the effect on the intention of the introduction. As the result of this study, the first is that the company has the higher technological innovation, the more positive the effect on Relative advantage Compatibility Perceived risk, Complexity. Second, The compatibility of the SCM system was rejected in innovation resistance, but it is adopted with the highest impact in the introduction intention. In addition, the mediating effect of innovation resistance was also rejected, confirming that if the SCM system is compatible for the company, it doesn't affect the resistance and is the biggest factor to consider in the introduction of the SCM system. Third, the perceived risk of the SCM system doesn't directly affect the intention to introduce, but has an indirect effect when mediation innovation resistance.

Pullout Behavior of Typical friction Anchors and Development of Design Method (앵커 형식별 인발거동과 설계법 개발)

  • 송일준;김가야;홍석우
    • Journal of Ocean Engineering and Technology
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    • v.17 no.4
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    • pp.43-51
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    • 2003
  • The resistance mechanism of anchor changes according to the types of anchor. Friction anchors are classified into tension and compression types. In this study, the characteristics and mechanism of pullout are analysed, and the design method of anchor and computer program for design are developed through compression test results of anchor body grout. The characteristics of compression anchor, compared with tension anchor, are summarized mainly as follows: (1) The effect of progressive failure of compression anchor body are much smaller than those of tension anchor during pullout of anchor: (2) The skin friction resistance is increased by Possion effect of grout (anchor body) during pullout of compression anchor.

Size Effect on Quench Development in Au/YBCO Films (Au/YBCO 박막의 크기가 퀜치 거동에 미치는 영향)

  • Kim, H.R.;Yim, S.W.;Oh, S.Y.;Hyun, O.B.
    • Progress in Superconductivity
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    • v.9 no.2
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    • pp.188-192
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    • 2008
  • We investigated the size effect on quench development in $Au/YBa_2Cu_3O_7$ (YBCO) thin film meander lines on sapphire substrates. The meander lines were fabricated by patterning YBCO films coated with gold layers. The lines were subjected to simulated AC fault current, and immersed in liquid nitrogen during the experiment. After the initial rapid rise, the resistance increased moderately and then slowly. In 4 inch-diameter meander lines, the period during which the resistance increased moderately was considerably longer than in 2 inch-diameter line. Moderate increase of resistance was originated from quench propagation. The film temperature was about 180 K at the point when the propagation was completed. The rate of resistance increase after the quench completion was not affected by the film size.

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STUDIES OF EFFECTS ON COPPER RESISTANCE IN YEAST AS INFLUENCED BY DESOXYRIBONUCLEATES (Saccharomyces cereisiase의 동저항변이에 미치는 DNA의 영향에 관한 연구)

  • 이민재
    • Journal of Plant Biology
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    • v.1 no.1
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    • pp.1-6
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    • 1958
  • 1. Study was made to investigate effects of desoxyribonucleates on copper-resistance in yeast. 2. It is found that the resistant strain there exists the phenomic lag. 3. In the occurrence of the resistant strain there exists the phenomic lag. 4. Desoxyribonucleate isolated from copper resistant culture is capable of inducing the resistant strain, which is the same type as donor of the resistant type. It accelerated the rate of variation to the resistant, but it is of no effect on the resistant strain. 5. Desoxyribonucleate derived from non-resistant type inhibits growth of the resistant strain and delays the initial phase of growth. However, it is of no effect on the sensitive strain. It is concluded that desoxyribonucleate derived from resistant culture is capable of inducing the resistance, however, nonresistant type desoxyribonucleate is of no effect on inducing the resistance.

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The Effect of Alloying Elements on Weldability and Corrosion Resistance of Austenitic Stainless Steels(I) (오스테나이트계 스테인리스강의 용접성과 내식성에 미치는 합금원소의 영향(I) - 응고균열 감수성을 중심으로 -)

  • Jeong, Ho-Shin;Lee, Yun-Young;Bae, Dong-Soo
    • Journal of Welding and Joining
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    • v.30 no.3
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    • pp.57-65
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    • 2012
  • The interest of austenitic heat resistant stainless steels containing high Si has increased because they have higher resistance of oxidation and higher strength at high temperature than STS 310. This study carried out Varestraint test for evaluation of solidification cracking sensitivity of 14 different stainless steels. As a result of Varestraint test, all specimens solidified as primary ferrite, and solidification crack sensitivity increased with adding $N_2$ to shielding gas. Nb and W had beneficial effect on solidification crack resistance in case of less than FN 2 containing, but crack sensitivity increased with Nb and W in case of more than FN 2. Ce had beneficial effect on solidification crack resistance but impaired weld bead appearance.

A Study on Chinese User Resistance of Mobile Banking (모바일 뱅킹에 대한 중국 사용자 저항에 관한 연구)

  • Cheng, Shuang;Lee, Sang-Joon;Lee, Kyeong-Rak
    • Journal of Digital Convergence
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    • v.12 no.1
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    • pp.105-114
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    • 2014
  • There are many studies on the adoption intentions for mobile banking. But there are no apparent effect on the popularity of it. This is so because the users have resistance to innovation on Mobile Banking. Therefore, it is necessary to identify empirically the problem of user resistance. In this paper, we identified hindrance factors of mobile banking with previous papers. And then we conducted empirical study by survey reply from undergraduates and graduate students in China. The results of this study are as follows. Social Influence and Perceived Complexity have positive effect on Perceived Risk, and Trust has negative effect on Perceived Risk. Perceived Security and Perceived Protection of Private information have no effect on Perceived Risk. Perceived Risk has effect on User Resistance. The significance of this paper is that financial institutions and telecommunications companies of China could potentially establish new and more accurate strategies based on the resistance factors identified in this paper to gain more profits.