• Title, Summary, Keyword: Separating Method

Search Result 545, Processing Time 0.046 seconds

Development of Method for Measuring the Grain Separating Performance of Threshers (탈곡기의 선별 성능을 측정하는 방법의 개발에 관한 연구)

  • 이승기;정창주
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.17 no.1
    • /
    • pp.3655-3665
    • /
    • 1975
  • This study was intended to develop a method for measuring the grain separating performance of threshers. The grain separating apparatus used for the experiment was designed and constructed, the function of which was to separate pneumatically mature and immature grain, chaff, straw, dust, and other impurities from the products of threshing. The apparatus has five material outlets where grains and impurities are fallen down by separation depending upon the specific gravity of the material white it moves above the outlets. The principle of design was to separate the mixture of mature grain, immature grain and chaff as distinct as possible, and to induce the mature grains onto the first outlet, the immature grains onto the second and the third, and the straw wastes onto the forth and the fifth outlets. The developed apparatus was tested to evaluate its separating performance with two rice varieties (Tongil and Mine-hikari) at different moisture levels and air velocities. The optimum conditions for operating the apparatus were found from experiment. The results are summarized as follows; 1. The degrees of separation, especially the amount of immature grain contained in the mature paddy, were dependent upon air speed delivered. The optimum air velocities for this apparatus for each levels of grain moisture contents were found from a series of experiments as follows; 14.7-15.3m/sec. for grain of 16 percent moisture content in wet basis, 15.3-16.0m/sec. for 20 percent, and 16.0-16.4m/sec for 24 percent. 2. Composition ratios determined based on the brine separating method was fairly well acted upon the developed apparatus, indicating its recollecting rate of the mature grains as 97.6 to 99.9 percent. The developed separatus acted similarly upon the two rice varieties which had different composition of immature paddy grain. In other words, the separating performance by the apparatus had a good correlation with the one by the brine separating method. 3. As immature grains were separated out unsatisfactory in these experiments than the brine separating method, further investigation may be needed to improve a separating performance of these materials. But the results obtained suggested a possibility of using the tester to replace the current hand separating method, ther eby enabling more consistent test results and also eliminating nearly all costly hand seperating operations.

  • PDF

THE MAGNETIC SEPARATION OF Nd-Fe-B POWDERS

  • Cui, Li-Ya;Zheng, Da-Li;Zhu, Jing-Han;Zhao, Wei-Hong;Ding, Shu-Lin
    • Journal of the Korean Magnetics Society
    • /
    • v.5 no.5
    • /
    • pp.672-678
    • /
    • 1995
  • The magnetic separation of Nd-Fe-B powders prepared by melt-spun and HDDR processes was investigated. The experiments show that the ununiform melt-spun powders can be separated into various standards by means of magnetic separation method. The magnetic powders with higher properties were obtained by the use of suitable separating field. For example, the properties of ununiform melt-spun powders are Br=7.95 kG, iHc=9.93 kOe and (BH)max=10.2 MGOe before separating. Through separating in different magnetic fields, the powders obtained with a separating field of 780 Oe has the optimum properties of Br=7.7 kG, iHc=11.0 kOe and (BH)max=15.3 MGOe. The magnetic properties of the HDDR magnetic powder are hardly separated by the magnetic separation method.

  • PDF

Heart Extraction and Division between Left and Right Heart from Cardiac CTA

  • Kang, Ho Chul
    • International Journal of Internet, Broadcasting and Communication
    • /
    • v.9 no.4
    • /
    • pp.19-24
    • /
    • 2017
  • In this paper, we propose an automatic segmentation method of left and right heart in computed tomography angiography (CTA) using separating energy function. First, we smooth the images by applying anisotropic diffusion filter to remove noise. Then, the volume of interest (VOI) is detected by using k-means clustering. Finally, we extract the left and right heart with separating energy function which we proposed to split the heart. We tested our method in ten CT images and they were obtained from a different patient. For the evaluation of the computational performance of the proposed method, we measured the total processing time. The average of total processing time, from first step to third step, was $14.39{\pm}1.17s$. We expect for our method to be used in cardiac diagnosis for cardiologist.

Study on the Threshing and Separating Performanee of the Newly Developed Throw-in Type Thresher (투입식 탈곡기의 탈곡 및 선별 성능에 관한 연구)

  • 이승규;정창규김성래
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.17 no.3
    • /
    • pp.3878-3884
    • /
    • 1975
  • This study was carried out to develop the throw-in type thresher with its size as small as possible. Developing the smallest possible size of the throw-in type thresher has been very important to increase mobility and to reduce the machine price. The thresher that developed for this purpose was tested as to threshing and separation performance for the samples collected in eight catch boxes under the concave while threshing. The amount of grain collected in each compartments was measured and the threshing and separating pattern along the total span of the threshing drum was determined. The performance of separating and threshing units of the test thresher and threshing loss was evaluated by use of the developed grain separating apparatus and the method for measuring the grain separating performance of threshers. The results are summarized as follows; 1. The unthreshed grain (drum losses) and semi-threshed grain did not appeared at all throughout the treatments. 2. When threshed by making use of the developed throw-in type thresher, the threshing grain loss at about 25 per cent grain moisture was about one-half when threshed at about 18 per cent grain moisture. 3. And its grain separating loss in higher feed rate was decreased in comparison with that of lower feed rate. These results suggests that the throw-in type thresher may be suitable for wet threshing and for higher feed rate of threshing. 4. Above 60 per cent of total grain passing through concave fell through the screen within a scant 30 cm from the feeding inlet. This threshing pattern may suggest that major threshing action may be finished before about one third of cylinder length. The required separating load extended over the whole drum span is so defferent that separating elements should be redesigned so as to accomodate this variable pattern of separation load. 5. It was apparent from the experiment that the length of the threshing drum of the throw-in type thresher could be reduced from 1285mm to about 1050mm without increasing grain separation loss greatly.

  • PDF

A Experimental Study on Waste Water Concentration by Separating Method of Freezing (동결분리방법을 이용한 폐수농축에 관한 실험적 연구)

  • Kim, Jung-Sik
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • /
    • pp.51-52
    • /
    • 2006
  • This study was progressed on the freezing behavior of waste water in relation to freeze concentration method useful to waste water treatment system of small and middle size and which can re-use purified water. The object of this experiment is comparing a pollutant contain of the frozen layer and of an aqueous solution by cooling wall temperature, a flow field effect and a initial thickness of frozen layer.

  • PDF

ACCURATE SYNTHESIS OF SEEDLING SEPARATING-PLANTING MECHANISM OF RICE TRANSPLANTER

  • Hu, Hanxiang;Chen, Dejun;Wang, Changbing;Li, Zhenyong;Wu, Jienian;Xu, Jinda
    • Proceedings of the Korean Society for Agricultural Machinery Conference
    • /
    • /
    • pp.284-290
    • /
    • 1993
  • In order to improve the adaptability of rice transplanter to seeding with different length when transplanting multicropping rice in south China. The seedling separating planting mechanism is resynthesized in the paper. According to the agronomy requirements of seedling's transplanting, optimum motional path of the tip point of planting needle is obtained. by applying the established kinematic model of the separating planting mechanism, the relevant software is compiled. On the basis of the features of the problem, the constrained optimization method is utilized to solve the problem with 24 restrictions. Thus, the optimum structure parameters are obtained to satisfy the path points accurately.

  • PDF

An Evaluation on the Performance of Recyclable Cement by Micron Separating Method (미세분급 방법 개선에 의한 재생시멘트의 성능 평가)

  • Hong, Young-Tae;Kim, Sae-Young;Ko, Eun-Hye;Oh, Sang-Gyun
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • /
    • pp.39-42
    • /
    • 2006
  • In this study, there is purpose that is on a concrete defect happen from aggregate minute's particle mixing in process that make waste concrete as recyclable cement puts to practical use constructing basic data for design of mix proportion used recyclable cement and solves strength fall problem using micron separator, and does general recyclable cement high quality. As a result of X-ray diffraction(XRD) of rater HR-C than NR-C is aware that it come out the micron-separating to decrease the $SiO_2$-peak below 50%. And a construction field which apply for strength's $24{\sim}28MPa$ HR-C in order to realize NR-C of 44% and 51%. Recycle concrete capacity through improved recycle cement of manufacturing technique by micron-separating's new distribution more better improvement. Therefore, in this study, it need to more various study a recycle cement of high quality for reasonable and utility recycling than disposal concrete.

  • PDF

A Study about the Separation of the materials Used in Refractory Cast Dies For Making All Ceramic Crowns (전부 주조관 제작을 위한 내화모형재 분리에 관한 연구)

  • Shin, Moo-Hak;Kim, Yeoun-Soo;Choi, Un-Jea
    • The Journal of Korean Academy of Dental Technology
    • /
    • v.21 no.1
    • /
    • pp.123-130
    • /
    • 1999
  • I attempted to suggest a better method to separate a refractory cast in order to solve the problems caused by bonding between refractory casts and ceramics in the firing-processing of all ceramic crowns as a part of dental prosthodontics. I emphasize the advantages and effectiveness of easy separation after firing by using the separating materials about the refractory cast dies. 1. We must not usse HF(55%) that is used as the chemical separating methods. 2. We decrease such methods as grinding, blasting, bur, and point 3. We can save time, costs and manual labors by using this methods. 4. This method regulates the expansion and constriction of heat because of the chemical reaction of the separating materials. 5. This method contribute to the breaking down without modification by minimizing the chemical and mechanical damages of the marginal and interior parts.

  • PDF