• Title/Summary/Keyword: dry time

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A Study on Shrinkage the Weft Knitted Fabrics (위편포의 수축에 관한 연구)

  • Sung Baek Joo;Choi Suk Chul;Chung Soon Young
    • Journal of the Korean Society of Clothing and Textiles
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    • v.4 no.1_2
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    • pp.25-33
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    • 1980
  • The studies on shrinkage and characteristics of the weft knitted fabrics were investigated under the various dry and wet treating conditions. Various relaxation values were found out according to treating conditions. The characteristics of knitted fabrics such as shrinkage rate, thickness, spirality, elongation and recovery were also measured. The used knitting yams were OE (open-end) cotton and POY (pre-oriented yarn)-DTY (draw textured yam) polyester. The conclusions obtained in this study are as follows. 1. In case of dry relaxation little change of Ks values was seen with increasing time after 48 hours. So it was found that relaxation shrinkage of dry relaxation reached its maximal state in about 48 hours. 2. In case of wet relaxation, higher Ks values were observed, in comparision with those of dry one and higher shrinkage rates were also observed. But when experimental temperature was constant, sudden marked increases in Ks values and shrinkage rates appeared through the initial 4 hours, and after that time little change was seen in them. 3. As Ks value increases, thickness also increased. But thickness showed to some degree stability around Ks value 23. 4. As Ks value increases, spirality values also increased gradually. But little change of spirality values was observed above a certain Ks values (cotton 22.5, polyester 21.5). 5. As Ks value increases, the elongation decreased under a certain load, and the recovery was random.

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Study on Vacuum Pump Monitoring Using Adaptive Parameter Model (적응형 인자 모델을 이용한 개선된 진공펌프 상태진단에 관한 연구)

  • Lee, Kyu-Ho;Lee, Soo-Gab;Lim, Jong-Yeon;Cheung, Wan-Sup
    • Journal of the Korean Vacuum Society
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    • v.20 no.3
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    • pp.165-175
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    • 2011
  • This paper introduces statistical features observed from measured batch data from the multiple operation state variables of dry vacuum pumps running in the semiconductor processes. The amplitude distribution characteristics of such state variables as inlet pressures, supply currents of the booster and dry pumps, and exhaust pressures are shown to be divided into two or three distinctive regions. This observation gives an idea of using an adaptive parametric model (APM) chosen to describe their statistical features. This modelling, in comparison to the traditional dynamic time wrapping algorithm, is shown to provide superior performance in computation time and memory resources required in the preprocessing stage of sampled batch data for the diagnosis of running dry vacuum pumps. APM model-based batch data are demonstrated to be very appropriate for monitoring and diagnosing the running conditions of dry vacuum pumps.

Water Content and Dry Density Measurement of Soil Using Flat TDR System (Flat TDR 시스템을 이용한 흙의 함수비와 건조단위중량 측정)

  • Kim, Wanmin;Kim, Daehyeon;Seo, Hyeok
    • Journal of the Korean Geotechnical Society
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    • v.33 no.11
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    • pp.5-19
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    • 2017
  • This study has been conducted to improve the conventional compaction management method by measuring the water content and dry unit weight of soil using the Time Domain Reflectometry (TDR) method. In order to verify the measured value of the developed flat TDR system, laboratory tests were conducted on six soils. Also, based on laboratory experiments, field tests were conducted to evaluate the applicability of the developed flat TDR system. Also, a comparison experiment was conducted with the Purdue TDR system. In addition, FE analysis was done to confirm the influence range of the Flat probe. As a result, it was confirmed that the influence range was about 10 cm. As a result of laboratory experiment, the water content ratio showed an error of about 0.4% on the average, and in the case of dry unit weight, it showed an error of about 1.6%. For the field test, the water content ratio and unit weight showed an error of 0.8% and 2.5%, respectively. Through the experimental results, it was confirmed that the measured value of the Flat TDR system is more accurate than that of the conventional TDR system.

Electrochemical Properties of Ball-milled Tin-Graphite Composite Anode Materials for Lithium-Ion Battery (볼 밀링으로 제조된 리튬이온전지용 주석-흑연 복합체 음극재의 전기화학적 특성)

  • Lee, Tae-Hui;Hong, Hyeon-A;Cho, Kwon-Koo;Kim, Yoo-Young
    • Journal of Powder Materials
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    • v.28 no.6
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    • pp.462-469
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    • 2021
  • Tin/graphite composites are prepared as anode materials for Li-ion batteries using a dry ball-milling process. The main experimental variables in this work are the ball milling time (0-8 h) and composition ratio (tin:graphite=5:95, 15:85, and 30:70 w/w) of graphite and tin powder. For comparison, a tin/graphite composite is prepared using wet ball milling. The morphology and structure of the different tin/graphite composites are investigated using X-ray diffraction, Raman spectroscopy, energy-dispersive X-ray spectroscopy, and scanning and transmission electron microscopy. The electrochemical properties of the samples are also examined. The optimal dry ball milling time for the uniform mixing of graphite and tin is 6 h in a graphite-30wt.%Sn sample. The electrode prepared from the composite that is dry-ball-milled for 6 h exhibits the best cycle performance (discharge capacity after 50th cycle: 308 mAh/g and capacity retention: 46%). The discharge capacity after the 50th cycle is approximately 112 mAh/g, higher than that when the electrode is composed of only graphite (196 mAh/g after 50th cycle). This result indicates that it is possible to manufacture a tin/graphite composite anode material that can effectively buffer the volume change that occurs during cycling, even using a simple dry ball-milling process.

Thermal Analysis for Dry Transport of a Shipping Cask (수송용기의 건식수송에 대한 열해석)

  • Lee, J.C.;Kang, H.Y.;Yoon, J.H.;Chung, S.H.;Kwack, E.H.
    • Nuclear Engineering and Technology
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    • v.25 no.2
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    • pp.248-254
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    • 1993
  • The purpose of this study is to evaluate the thermal safety for dry transport of a shipping cask. Analysis condition was based on an ambient temperature of 38$^{\circ}C$ for normal heat condition. The cask was designed to carry 4PWR spent fuel assemblies with a burnup of 38,000 MWD/MTU and 3 years of cooling time. Thermal analysis was carried out by using the COBRA-SFS code. The fuel cavity was considered to be filled with air, nitrogen or helium gas for dry transport. The results of analysis showed that the maximum temperatures of fuel rod cladding in air and helium cavity would be 277$^{\circ}C$ and 226$^{\circ}C$, respectively, for 3 years of cooling time. These values were less than the specified temperature to maintain the thermal integrity of fuel assembly for dry transport.

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Reference values for selected dry eye tests in normal Beagle dogs: a pilot study

  • Kim, Youngsam;Kang, Seonmi;Kim, Sunhyo;Shim, Jaeho;Go, Seokmin;Seo, Kangmoon
    • Journal of Veterinary Science
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    • v.23 no.1
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    • pp.10.1-10.12
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    • 2022
  • Background: Dry eye disease (DED) cannot be diagnosed by a single test because it is a multifactorial disorder of the ocular surface. Although studies on various dry eye tests (DETs) in dogs have been reported, standard criteria have not been established except for the Schirmer tear test 1 (STT-1). Objectives: To establish reference values for DETs in dogs with normal STT-1 values (≥ 15 mm/min) and to analyze the correlation between DETs. Methods: The STT-1 was performed in 10 healthy Beagle dogs (20 eyes). After 20 min, interferometry (IF) for estimating the lipid layer thickness (LLT) of the tear film, tear meniscus height (TMH), non-invasive tear breakup time (NIBUT), and meibomian gland loss rate of the upper eyelid (MGLRU) and lower eyelid (MGLRL), were measured using an ocular surface analyzer. Results: Mean values for STT-1, TMH, and NIBUT were as follows: 21.7 ± 3.4 mm/min, 0.41 ± 0.21 mm, and 19.1 ± 9.5 sec, respectively. The most frequent LLT range, measured by IF, was 30-80 nm (11 eyes), followed by 80 nm (5 eyes) and 80-140 nm (4 eyes). MGLRU ≤ 25% was measured in 11 eyes and 26%-50% in 9 eyes; MGLRL ≤ 25% in 8 eyes and 26%-50% in 12 eyes. Besides positive correlation between TMH and NIBUT (P = 0.038), there were no significant associations between DETs. Conclusions: Data obtained in this study provided normative references that could be useful for diagnosing DED and for further research into correlation between DETs in dogs with DED.

Effect of Sowing Date and Planting Density on Growth, Yield and Anthocyanin Content of Purple Corn 'sakso 1'

  • Hee Yeon Kim;Jae-Keun Choi;Si-Hwan Ryu;Moon-jong Kim;Jung Heon Han;Seung Hyun Wang;Ki Sun Kim
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2022.10a
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    • pp.55-55
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    • 2022
  • Purple com Saekso 1 was developed by Maize Research Institute (Hongcheon, Gangwon, Korea) and registered in 2011. Saekso 1 is a anthocyanin-rich hybrid variety that is yellow grain, purple husk and cob. Purple husk and cob of Saekso 1 is as a resource for the bioactive material by health food. In order to investigate optimum sowing date and planting density of Saekso 1. Agronomic characteristics were compared by sowing times April 25, May 15 and June 5. Husk dry weight were 68,72 and 70kg·10a-1, respectively. Cob dry weight were 90, 92 and 92kg·10a-1, respectively. Content of cyanidin-3-glucoside in husk were 0.56, 0.62 and 0.56% and in cob were 0.19, 0.14 and 0.17%. Therefore, the sowing time to increase husk and cob weight and content of cyanidin-3-glucoside is appropriate for planting in mid-May. The number of plants in planting density trial was 9,400, 7,000, 5,700 and 4,700 plants in 10a area. Plant height at each trial were 249, 250, 246 and 248cm, respectively. Husk dry weight were 76, 67 and 63 and 60kg·10a-1, respectively. Cob dry weight were 112, 92, 87 and 81kg·10a-1, respectively. Content of cyanidin-3-glucoside in husk were 0.70, 0.71, 0.71 and 0.75% and in cob were 0.21, 0.28, 0.26 and 0.20%. Therefore, appropriate sowing time was in mid-May and planting density was 5,700~7,000 plants·10a-1 in order to increase the yield and content of cyanidin-3-glucoside of purple com in South Korea.

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Weed Occurrence Accompanied by Sowing Time and Control System in Dry-seeded Rice Fields (벼 건답직파(乾畓直播) 재배시기별(栽培時期別) 잡초발아양상(雜草發芽樣相) 및 방제체계(防除體系))

  • Choi, C.D.;Choi, J.S.;Kim, C.R.;Choi, B.S.;Yeo, S.K.
    • Korean Journal of Weed Science
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    • v.18 no.2
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    • pp.116-121
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    • 1998
  • Field experiment were carried out to elucidate the changes of weed occurrence according to the sowing time and to establish the efficient weed control system in dry seeded rice cultivation. E crus-galli and D. sanguinalis are tow major weeds at the earlier sowings, but C. difformis was dominating at the later sowing. In the case of E. crus-galli, there was a tendency of gaining its dominance values as the rice growth stage advances. The later the sowing time was, the more weeds occurred at the early rice growth stages: However, when measured at heading, total dry weight was greater at the earlier sowings. Yield loss due to weeds were also greater at the earlier sowings. Community diversity of weeds was greater at the later sowings, while specific weed was gradually dominating as rice growth stage advances, regardless of sowing time. When herbicides were applied before 15 DAS, weeds were effectively controlled only upto 35 DAS. So systemic herbicide application, one on 0 to 10 DAS and the other on just after flooding, appeared to be recommendable in direct seeded rice cultivation.

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A Study on the Development and Performance Test of the Non-gravity Fluidized Dryer (무중력 유동층 건조기 개발과 성능평가)

  • Han, J.W.;Kum, S.M.;Lee, C.E.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.665-670
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    • 2001
  • The purpose of this study is to develop a new type dryer, which is to proceed mixing and drying of wet-materials at the same time and drying process is carried out in a closed system. In this drying system, thermal contact occurs, when a fluidized zone is created by paddle mechanism. Accordingly, wet-materials is dried in a short time without any damage. Also wet-materials could be dried uniformly to low moisture contents. It is suitable to dry a small quantity of multi-kind materials. And drying process is carried out in a closed system, so as for environmental pollution dust not to be emitted into the atmosphere. Accordingly, it could be used to dry not only food and chemical materials, but also environmental pollution materials.

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백화사설초의 현탁세포배양에 의한 oleanolic acid 생산

  • Lee, Yong-Il;Jo, Ji-Suk;Kim, Dong-Il
    • 한국생물공학회:학술대회논문집
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    • 2003.04a
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    • pp.267-270
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    • 2003
  • Oleanolic acid is a triterpenoid compound that exists in Oldenlandia diffusa. Recently, oleanolic acid has been noted for antitumor effect. Application of both plant growth regulators, 2,4-D and kinetin, was found to be essential for the induction of callus and suspension cells. Optimum induction condition for callus and suspension cells of Oldenlandia diffusa was determined to be 0.5 mg/L 2,4-D and 0.1 mg/L kinetin. Chromatographic separation of oleanolic acid from its derivatives was achieved using Rexchrom S5-100-ODS column. The retention time of oleanolic acid was 12.6 min and the specific content of oleanolic acid was 0.41 mg/g dry weight.

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