• Title/Summary/Keyword: heavy equipment

Search Result 501, Processing Time 0.026 seconds

Uptake and Translocation of Heavy Metals to Rice Plant on Paddy Soils in "Top-Rice" Cultivation Areas (탑라이스 생산지역 논 토양 중 잔류중금속의 벼 흡수이행)

  • Park, Sang-Won;Yang, Ju-Seok;Ryu, Seung-Won;Kim, Dae-Yeon;Shin, Joung-Du;Kim, Won-Il;Choi, Ju-Hyeon;Kim, Sun-Lim;Saint, Andrew Flynn
    • Korean Journal of Environmental Agriculture
    • /
    • v.28 no.2
    • /
    • pp.131-138
    • /
    • 2009
  • Heavy metal residues in soil, rice straw, unhulled rice, rice hull, polished rice, and rice barn on the rice paddy in the "Top rice production complex which is non-contaminated area were evaluated. It was observed that the average concentrations of As, Cd, Cu, Pb, and Hg in the paddy soils were 1.235, 0.094, 4.412, 4.728 and 0.0279 mg/kg, respectively. There were no cultivation areas exceeded of the threshold for soil contamination designated by "The Soil Environment Conservation Law" in Korea. For the polished rice, there were no samples exceeded of a permissible level of heavy metal residues such as 0.051 mg/kg of As, 0.040 mg/kg of Cd, 0.345 mg/kg of Cu, 0.065 mg/kg of Pb and 0.0015 mg/kg of Hg. For the uptake and translocation of heavy metals to rice plant, a main part of heavy metal accumulation was rice straw, and then rice bran. Furthermore, it shown that accumulation of heavy metals in unhulled rice, rice hulls, brown rice, and polished rice was approximately similar as low. The slopes of translocation of heavy metals from soil to polished rice were following order as Cd, 0.4321 > Cu, 0.054 ${\fallingdotseq}$ Hg, 0.052 > As, 0.021 > Pb, 0.008. It was observed that potential ability of Cd uptake in rice plant and then its translocation into polished rice was very high. Concentrations of copper and mercury absorbed in the rice plant were moderate for translocating into the polished rice, while the arsenic and lead in the plant were scarcely translocated into the polished rice. The distribution of heavy metals absorbed and translocated into aboveground parts of rice plant was appeared that there were remained at 63.3-93.4% in rice straw, 6.6-36.9% in unhulled rice, 0.6-5.7% in rice hulls, 3.2-31.3% in brown rice, 0.8-4.6% in rice bran and 1.1-26.7% in polished rice. The accumulation ratio of Cd in the aboveground parts of rice plant was remained at 26.7-31.3% in brown and polished rice.

Reliability assessment test for heavy sluice gate of hydraulic cylinder (수문용 대형 유압실린더의 신뢰성 평가)

  • 이용범;현동수;김형의;이근호;정동수
    • Proceedings of the Korean Reliability Society Conference
    • /
    • 2001.06a
    • /
    • pp.91-97
    • /
    • 2001
  • These Study are for the development of the reliability assessment test code and test equipment and test procedures of the heavy sluice gate hydraulic cylinder. Because there is no reliability test code for the heavy sluice gate hydraulic cylinder inside and outside of the country, the modified reliability test code is made reference for the related existing standards like as ISO, JIS, MIL, TUV, DIN, KS and etc. In this study, the novel method is proposed to evaluate efficiency of the heavy sluice gate hydraulic cylinder on the loading conditions and established the conditions of the acceleration life test to reduce the testing time and cycles. The testing equipments for life test, lode operating test, high and low temperature test and salt spray test have been established for 8 month, and the reliability tests are accomplished. The test results of the heavy sluice gate hydraulic cylinder which is produced and tested initially in Korea are satisfied the durability life cycle on the using conditions.

  • PDF

Development of Electric Equipment for Plug-in Hybrid Electric Vehicle (플러그인 하이브리드 전기자동차용 전장품 개발)

  • Lee, Jong-Chan;You, Doo-Young;Bang, Lee-Seok;Choi, Uk-Don;Lee, Se-Hyun
    • Proceedings of the KIPE Conference
    • /
    • 2011.07a
    • /
    • pp.318-319
    • /
    • 2011
  • Many countries are concentrating on the development of electric vehicle technology with increasing concerns about the global environment. Along with these concerns, plug-in hybrid electric vehicles(PHEVs) are being developed as environment-friendly cars which reduce greenhouse gas emissions and also eliminate the problem of range anxiety associated to all-electric vehicles, because the combustion engine works as a backup when the batteries are depleted. In this paper, electric equipments of the PHEV which meet the target specifications were developed, and their performance was proven through confirmatory testing on the PHEV at Korea Automotive Technology Institute(KATECH).

  • PDF

Development and Application of Digital D.C Protection Relay for the test line of Light Rail Transit (경량전철 시험선로의 디지털 직류보호제어장치 개발 및 적용)

  • JEON Y.J.;KIM S.N.;KIM J.H.;BAEK B.S.;LEE H.D.
    • Proceedings of the KIEE Conference
    • /
    • summer
    • /
    • pp.1373-1375
    • /
    • 2004
  • This paper presents the design of DC protection Relay for Light Rail Transit system, which is very beginning product in domestic. Protection Function characteristic, principle and I/O interface including interlock signal has been introduced. The protection algorithm and EMC characteristics have been certified by official organization and Type test report has been introduced. Up to date in domestic, the test procedure for DC Protection relay hasn't been established so the new method and test equipment based on IEC regulations are proposed. Finally the product will be proved based on field test.

  • PDF

Experience with an On-board Weighing System Solution for Heavy Vehicles

  • Radoicic, Goran;Jovanovic, Miomir;Arsic, Miodrag
    • ETRI Journal
    • /
    • v.38 no.4
    • /
    • pp.787-797
    • /
    • 2016
  • Mining, construction, and other special vehicles for heavy use are designed to work under high-performance and off-road working conditions. The driving and executive mechanisms of the support structures and superstructures of these vehicles frequently operate under high loads. Such high loads place the equipment under constant risk of an accident and can jeopardize the dynamic stability of the machinery. An experimental investigation was conducted on a refuse collection vehicle. The aim of this research was to determine the working conditions of a real vehicle: the kinematics of the waste container, that is, a hydraulic rotate drum for waste collection; the dynamics of the load manipulator (superstructure); the vibrations of the vehicle mass; and the strain (stress) of the elements responsible for the supporting structure. For an examination of the force (weight) on the rear axle of a heavy vehicle, caused by its own weight and additional load, a universal measurement system is proposed. As a result of this investigation, we propose an alternative system for continuous vehicle weighing during waste collection while in motion, that is, an on-board weighing system, and provide suggestions for measuring equipment designs.

Development of the Air Cushion Carrier Equipment for Carrying Heavy Loads (중량물 운반을 위한 에어쿠션 이송장비의 개발)

  • Yun, Dongwon;Park, Hee-Chang;Kim, Byung-In;Lee, Sung-Hwi;Jang, Seung-Ik;Hong, Ik-Pyo
    • Journal of Power System Engineering
    • /
    • v.19 no.5
    • /
    • pp.17-24
    • /
    • 2015
  • In this paper, the development of an air cushion transporter has been studied. To do this, theoretical analysis is introduced to design the equipment and computational fluid dynamics is also conducted. Design of an air cushion transporter for heavy load carriage is completed and a prototype is manufactured. Through the analysis and experiment of the developed the prototype, it can be known that the developed transporter can levitate the load of about 1 ton at the applied pressure of 0.2 MPa and the maximum lifting height at this condition is 17mm.

A Study on Fatigue Assessment of the Crane Post due to Vibration during the Emergency Stop (충격하중에 의한 Jib Crane Post의 피로 수명 평가)

  • Kim, Kuk-Su;Kim, Nho-Seong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2011.04a
    • /
    • pp.633-637
    • /
    • 2011
  • The tall and slender main crane is generally installed on the upper deck to load and unload the equipment or something heavy in the drilling rig or the ship. So the natural frequency of the crane equipment is very low, therefore, there is some possibility of excessive vibration at the emergency state due to sudden stop during the crane operation. This study describes a fatigue assessment due to heavy vibration during brake test of sudden stop because it is necessary the safety of crane is estimated against the heavy vibration. In order to find out the applied force, the vibration measurement and analysis have been performed.

  • PDF

Thermal and Mechanical Properties of Epoxy/Micro- and Nano- Mixed Silica Composites for Insulation Materials of Heavy Electric Equipment

  • Park, Jae-Jun;Yoon, Ki-Geun;Lee, Jae-Young
    • Transactions on Electrical and Electronic Materials
    • /
    • v.12 no.3
    • /
    • pp.98-101
    • /
    • 2011
  • A 10 nm nano-silica was introduced to a conventional 3 ${\mu}M$ micro-silica composite to develop an eco-friendly new electric insulation material for heavy electric equipment. Thermal and mechanical properties, such as glass transition temperature (Tg), dynamic mechanical analysis, tensile and flexural strength, were studied. The mechanical results were estimated by comparing scale and shape parameters in Weibull statistical analysis. The thermal and mechanical properties of conventional epoxy/micro-silica composite were improved by the addition of nano-silica. This was due to the increment of the compaction via the even dispersion of the nano-silica among the micro-silica particles.

The package loading equipment development cutting both ends in the process of packaging lumber for improving the working environments (작업환경개선을 위한 목재포장공정에 있어서의 양끝절단포장적재장치 개발)

  • Kang, Ji-Ho;Hong, Dong-Pyo
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.29 no.1
    • /
    • pp.135-142
    • /
    • 2006
  • The package loading process of tile lumbering industry is an operation that after a pair of workers binds three or six lumber into a unit and cut the both ends of the lumber, carry and pack and load the weight cargo of 30-50kg. The package loading process causes lots of noise and wood dust when the lumber are cut and brings about the main cause of the musculoskeletal disorder when workers carry the heavy goods. Therefore, we developed the monolithic package loading equipment cutting both ends that is enable to improve the working method and environments of the existing package loading process. The noise and wood dust were reduced by developing the device and the main cause of shirking duties on working place was solved by preventing the musculoskeletal disorder and improving the working environments as excluding the work of carrying heavy goods.

Study on the Impact Coefficient of the Lifting System (조금구의 충격계수에 관한 연구)

  • 하대환
    • Journal of the Korean Professional Engineers Association
    • /
    • v.34 no.3
    • /
    • pp.64-67
    • /
    • 2001
  • In resent the weight of structure is heavier and bigger than before. Engineers use many heavy equipments to erect buildings and bridges. The heavy equipment is very useful to lift any weight. But most engineers do not know the impact of the weight when the equipment lifts the weight. In this study one researched into the impact of the weight in the crane work which lifts the weight in the construction site. Also along the number of pulley sheave the impact of the weight was researched. From the impact field test the impact coefficient of a single pulley sheave crane was 0.65 and the four pulley sheaves crane was 0.13. The result shows that the impact coefficient of a single pulley crane is more than 5 time of the impact coefficient of the four pulley sheaves crane and that engineers must consider the impact effect of the crane work in the construction site.

  • PDF