• Title/Summary/Keyword: main nut

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Analysis of Fatigue Safety for Anti-Loose Nuts System with Dual Nuts (이중너트가 적용된 풀림방지너트 시스템의 피로안전성 분석)

  • Choi, Jung-Youl;Kim, Jun-Hyung;Chung, Jee-Seung;Ka, Sang-Hyun
    • Journal of the Korean Society of Safety
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    • v.32 no.4
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    • pp.22-27
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    • 2017
  • In this study, the authors aim to evaluate a structural and fatigue safety of a new type anti-loose nut system with dual nuts composed of main nut and outer nut to enhance the long-term workability and durability so as to improve the performance of conventional anti-loose nut system. Also, a three-dimensional finite-element method analysis was performed to consider the actual geometry and material property of anti-loose nut system with dual nuts and the effect of static and dynamic loads and loading directions. The analytical results showed that the overall static and dynamic stress of the components of the anti-loose nut system with dual nuts were found to be less than that of the fatigue limit of Goodman-smith diagram and allowable stress of each materials, therefore the anti-loose nut system with dual nuts was sufficient to ensure a structural and fatigue safety.

Optimal Design of the Forging Processes of Flare Nut for Automobiles using Finite Element Analysis (유한요소해석에 의한 승용차용 플레어 너트 단조공정의 최적설계)

  • 추덕열;한규택
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.1
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    • pp.83-89
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    • 2004
  • Flare nut is an important Part that used to joint a brake tube-end in automobiles. It was made of SWCH 10A by machining. But we studied to make it by metal forming. The main focus of this paper is to investigate an optimal forging processes for flare nut using the DEFORM$^{TM}$-3D. commercially available finite element code and tests. Actually an explicit finite element analysis of the flare nut forging processes has been carried out to predict an optimal shape of the flare nut and its results were reflected in the tests of the forging processes design for flare nut. The simulation results which had obtained from finite element analysis were contributed to the forging processes design for flare nut. An optimal shape of nave nut showed agreements with test results. Furthermore. this paper should contribute to a development of the forging process for a variety of parts.s.

Studies on the Lipid Components of Ginkgo Nut (은행종실(銀杏種實)의 지질성분(脂質成分)에 관한 연구(硏究))

  • Chung, Ann-Suk;Shin, Hyo-Sun
    • Korean Journal of Food Science and Technology
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    • v.10 no.2
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    • pp.119-123
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    • 1978
  • Lipids, extracted with chloroform-methanol (2:1 by vol.) and purified, from nut and leaf of Ginkgo biloba were identified and quantitatived by column, thin layer and gas liquid chromatography. The results were summarized as follow: 1) The total content of purified lipids in the nut and leaf on the fresh weight basis were 1.32% and 2.24%, respectively. 2) The lipid fractions in the nut obtained by silicic acid colum chromatography were found to be composed of about 89% neutral lipids and about 10% compound lipids, and in the leaf were found to be composed of about 28% neutral lipids and about 72% compound lipids. 3) Among the neutral lipid fractions, triglycerides (86.2%) were the major component in the nut, but esterified sterols (53.3%) were the major component in the leaf. 4) The main fatty acids of the total lipids were oleic(37.5%) and linoleic acid(44.5%) in the nut, but linolenic(45.2%) and palmitic acid (25.1%) were main fatty acids in the leaf. The patterns of fatty acid composition of the neutral lipid fractions in the nut and leaf were found to be similar, and oleic, linoleic and palmitic acid were the predominant. A large amount of oleic and linoleic acid in the glycolipid fractions was found in the nut compared with those in the leaf, but linolenic acid content in the leaf was significantly higher than in the nut. And patterns of fatty acid composition of the phospholipid fractions in the nut and leaf were found to be similar to that of glycolipid fractions.

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Nut Characteristics of Walnut Hybrids (Juglans spp.) (호도나무 교잡종의 과실특성)

  • Lee, Uk;Lee, Moon-Ho;Hwang, Suk-In;Byun, Kwang-Ok
    • Korean Journal of Plant Resources
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    • v.20 no.1
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    • pp.63-68
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    • 2007
  • The purpose of this study was to applicate fundamental data for breeding new cultivar through selection of superior individuals and to investigate its nut characteristics in walnut hybrids. Selection of superior individuals with good nut qualities including high nut weight (NWT, >13g) and percentage of weight relative to total weight of nut (PWR, >50%) was carried out and then 4 promising individuals ($Sansung 4{\times}Concord-8,\;Concord{\times}Sansungl,\;Concord{\times}Sansung4\;and\;McKinster{\times}Punghan1$) were selected by quantitative characters. Especially width of pad of suture was main factor in selection of nut with high PWR (percentage of weight relative to total weight of nut) In addition, kernel length showed high correlation with kernel and nut weight. Thickness of septem (TOP) also had an effect on ease of kernel removal (EKR). In qualitative characters, there is a great difference among the individuals and cross combinations as well as showed simultaneously various characteristics in the same individual.

Survey of Costs for Chestnut Production in Main Cultivation Regions (밤나무 주요 재배지역의 생산비 분석)

  • Kim, Jae Sung;Lee, Uk
    • Journal of Korean Society of Forest Science
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    • v.98 no.4
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    • pp.504-511
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    • 2009
  • This study to understand the production cost of cultivation in chestnut tree (Castanea spp.) as a result of a survey conducted of 227 farmers is as follows. In full-time farmer, average cultivation area was 5.5 hectares and average chestnut production was 1.6 tons per hectare. In chestnut sale type, more than 73% of total production was sold by Nong-hyup (7an agricultural cooperative association) and intermediaries, and also proportion of nut size grade was 18% in special-large nut, following 49% in large nut, 25% in middle nut and 8% in small nut. There was considerable difference among cultivated regions in gross income, whereas total average gross income was 2,103 thousand KRW per hectare and 66.4% of it was used in management expenses. Finally the chestnut cultivated farmers have a yearly income of 706 thousands KRW (net income rate 33.6%). As peculiarity of regional production cost, a low tree farm in height and a labor intensive growing helped the improved quality of the chestnut so, on average, 2,161 thousand KRW per hectare of the income of the Chungnam was raised. However caused by an old-age of chestnut trees, there was a little input to management expenses and it resulted in low productivity in the Jeonnam and the Gyeongnam.

Design, Manufacture and Testing of the Hydraulic Coconut Dehusking Machine

  • Kwangwaropas, Nongkol
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.648-655
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    • 1993
  • The hydraulic coconut dehusking machine consists of three main parts ie. The frame , the power unit including the hydraulic accessories, the lifting and dehusking mechanisms. Two sets of the hydraulic coconut dehusking machine were developed . their hydraulic and electrical control circuits were connected in series to enable them operating contemporaneously. Two operators are required to operate the machine. Each of them put a coconut on the lifting mechanism in order to start the working cycle automatically. As a result, the nut are immediately pushed up and seized by the holding teeth under the supplement of the hydraulic reducing circuit. After that the dehusking mechanism started operating via the sequence circuit. At the end of the cycle, both mechanisms return to their original positions. Some remaining fibrous is taken out manually from the nut subsequently . The continuous dehusking speed was found to be 22.2 seconds per 2 coconuts.

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Comparative studies on the fatty acids in the green and roasted coffee beans (커피의 원두와 배전두의 지방산조성에 관한 비교연구)

  • 고영수
    • Journal of the Korean Home Economics Association
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    • v.24 no.3
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    • pp.119-127
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    • 1986
  • To investigate differences in fatty acid composition in green coffee beans and roasted coffee beans, the extracts of two beans were subjected to analysis of fatty acid composition by GC and HPLC. The results showed that palmitic and liolneic acid were the main fatty acids of coffee oil and their contents were about 40%. Minor components, such as capric acid, lauric acid and myristic acid were detected in both samples by GC, but nut HPLC.

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Vibration Characteristics of a Wire-Bonding Piezoelectric Actuator (와이어 본딩용 압전 액츄에이터의 진동 특성)

  • Kim, Young-Woo;Kim, Kyoung-Up;Lee, Seung-Yop
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.578-582
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    • 2007
  • In this paper, vibration modes and frequencies of a ring-type stacked piezoelectric actuator for a wire bonding transducer system are analyzed using FEM simulations. We implement experiments using a commercial product model of the actuator PZT module which consists of 6 layer ring-type PZT and 7 electrodes, combined bolts, nut and tinut. There are two main results: One is that FEM analysis should consider the effect the harmonic voltage input in order to meet the experimental results. The other is that the current wire bonder using exciting frequency of 136 kHz should be modified in order to improve the actuator and bonding performance because the actuator module has the main longitudinal mode of 145 kHz.

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Specialized Research on Food Culture of Main Family in Chung-Buk through In-Depth Interview (심층면접을 통한 충북지역 종가(宗家) 음식문화 특성 연구)

  • Kim, Mi-Hye;Han, Jung-In;Chung, Hae-Kyung
    • Journal of the East Asian Society of Dietary Life
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    • v.25 no.4
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    • pp.574-593
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    • 2015
  • This research's main objective was to analyze the special qualities of food culture of the Main Family in Chung-Buk through a case study on the diversified types of meals that the Main Family cooked, such as courtesy food, normal food, and seasonal food. The research identifies traditional ingredients of specialties from Chung-Buk through old literature. According to "Sejongsillokjiriji", there are a myriad of ingredients:, including jujube, ginseng, pine mushroom, manna lichen, persimmon, mandarin fish, crab, sweetfish, lacquer, honey, and terrapin, which represent Chung-Buk's unique ingredients. Another reliable source, "Banchandungsok", does not provide a detailed list of traditional foods, but rather a simple list. The majority of food from Chung-Buk, in "Banchandungsok", consist of side dishes like kimchi and salt greens. Eventually, salt greens became diversified. As Chung-Buk is a landlocked province, people often used dried pollack. Kimchi and raw coaker were frequently used as well, and rice cakes encompassed multiple ingredients such as: jujube, mushroom, pine nut, and, dried persimmon. There were distinct differences in the diversity of food and amount of dishes used by the Main Families of Chung-Buk dependent on the ingredients and wealth of each Main Family. Chung-Buk has a landscape full of mountains, so potatoes were abundant and used to make potato Dasik. When cooking process was completed, people placed kelp on to the finished product. Seasonal foods were considered very important, especially on special occasions such as Backjoong, which was a day dedicated to laborers. These foodsprovided a good opportunity for the community to build stronger bonds by sharing rice cake and Yukgaejang with other members of the community. It is apparent that "Jeobbingac" culture, or guest culture, flourished since people in Chung-Buk are traditionally taught to leave spare food for the guest at all times.

Betel Quid Chewing and Upper Aerodigestive Tract Cancers: A Prospective Cohort Study in Khon Kaen, Thailand

  • Kampangsri, Wilas;Vatanasapt, Patravoot;Kamsa-ard, Siriporn;Suwanrungruang, Krittika;Promthet, Supannee
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.7
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    • pp.4335-4338
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    • 2013
  • Background: This study aimed to determine the association between betel quid chewing and the occurrence of upper aerodigestive tract (UADT) cancers. Methods: A cohort of 17,388 subjects, recruited and interviewed over the 1990-2001 period, in Khon Kaen, Thailand, was followed up until 2011. The data were linked to the Khon Kaen Population-Based Cancer Registry. Results: The prevalence of betel quid chewing was 15.9%, with a female predominance (97.7%); the mean age of chewers was 57.7 years (SD 6.6). The overall incidence of UADT cancers from the cohort was 14.7 per 100,000 person-years, whereas the incidence among the chewers was 45.7. Betel nut chewing was the only major risk factor for UADT cancers in this population (HR=5.26, 95%CI=2.51-11.0), while weak associations were found for tobacco smoking and alcohol (HR=1.16, 95%CI=0.45-3.01 and 1.47, 95%CI=0.72-3.03 respectively). Conclusions: We found betel quid chewing to be a main risk factor for UADT cancers, resulting in a higher incidence in females. However, further study is required to explore the potential risk factors among non-chewers, non-smokers, and non-drinkers.