• Title/Summary/Keyword: mill quality

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Psychoanalytical View of Anxiety (정신분석적 관점에서의 불안)

  • Park Yong-Chon
    • Anxiety and mood
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    • v.1 no.1
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    • pp.14-17
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    • 2005
  • By the influence of the descriptive approach of DSM-III, the anxiety became the same thing as the anxiety disorder to the clinicians. This unfortunate result sacrificed psychodynamic model of symptom formations and simplified the anxiety as one of the disease entity not as the overdetermined symptoms. These phenomenon awakened the psychoanalytic interest which was in sleep. Freud was the first major articulator of the basic significance of anxiety in human behavior. He attributed the particular quality of the anxiety experience to the trauma of birth, and subsequently to the fear of castration. Such classification of the anxiety according to the psychosexual development is helpful for the clinicians in understanding the origin of anxiety which the patient shows during the psychotherapy. The other analytical view of interpersonal psychoanalysis came from Sullivan. A large part of his therapy is taken up with recognizing and correcting parataxic distortions that interfere with realistic self-appraisal of events and of oneself in relation to others. Perhaps no explanation is the 'most basic' explanation for human anxiety. Anxiety is a multifaceted entity consisting of aspects of realm of discourse. Existential anxiety is inescapable in Western culture but it can be transcended by the cultivation of mind in Eastern culture. The analysts need to stay attuned to their own propensities for anxiety and must permit their own experiences with anxiety to be the grist for the psychotherapeutic mill.

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Development of Multi-point Heat Flux Measurement for Steel Quenching (강재 열처리용 다점 열유속 측정 기술 개발)

  • Lee, Jungho;Oh, Dong-Wook;Do, Kyu Hyung;Kim, Tae Hoon
    • Journal of the Korean Society for Heat Treatment
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    • v.25 no.4
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    • pp.181-189
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    • 2012
  • The demand on quantitative measurement of the heat flux is motivated in making higher-quality steel product through a water quenching process of plate mill. To improve a spatial degree of heat flux measurement, the multi-point heat flux measurement was carried out by a unique experimental technique that has a combination of the existing single-point heat flux gauge. The corresponding heat flux can be easily determined by Fourier's law in a conventional way. The multi-point heat flux gauge developed in this study can be applicable to measure the surface heat flux, the surface heat transfer coefficient during a water quenching applications of steelmaking process. The results exhibit different heat transfer regimes; such as single-phase forced convection, nucleate boiling, and film boiling, that are occurred in close proximity on the multi-point heat flux gauge quenched by water impinging jet.

The Influence of FGD Gypsum Fabricated from Limestone Sludge on Cement Properties

  • Seo, Sung Kwan;Chu, Yong Sik;Shim, Kwang Bo;Lee, Jong Kyu;Song, Hun
    • Journal of the Korean Ceramic Society
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    • v.53 no.6
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    • pp.676-681
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    • 2016
  • For the purpose of reducing the amount of limestone, which is used as a desulfurization agent to absorbing $SO_X$ gas in thermal power plants, and to recycle limestone sludge generated from a steel mill, limestone sludge was utilized as a desulfurization agent. In this study, cement, made of flue gas desulfurization (FGD) gypsum obtained in a desulfurization process using limestone sludge, was manufactured then, experiments were conducted to identify the physical properties of the paste and mortar using the cement. The results of the crystal phase and microstructure analyses showed that the hydration product of the manufactured cement was similar to that of ordinary Portland cement. No significant decline of workability or compressive strength was observed for any of the specimens. From the results of the experiment, it was determined that FGD gypsum manufactured from limestone sludge did not influence the physical properties of the cement also, quality change did not occur with the use of limestone sludge in the flue gas desulfurization process.

The Future of Paper-Making: New Challenges for Technology

  • Karlsson, Markku;Lindroos, Kaj
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.32 no.5
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    • pp.67-71
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    • 2000
  • The history of the paper industry has shown a strong technological evolution which has been an essential factor in achieving low cost, high quality paper products and in sustaining the strength of the industry. In the last decades paper machine development has been rapid. This has helped to establish paper as a "low cost" material. In future, the pressure from the competing media will only accelerate the technological efforts to improve cost and functional'||'&'||'not;ity of paper. In addition, in the future, technological advances will be combined with innovation in busi'||'&'||'not;ness concepts. Certain production methods are likely to be developed which will distribute current process stages outside the paper mill. Papermakers can begin to reduce their invest'||'&'||'not;ment risk by subcontracting large-scale base paper production but taking responsibility for the higher value finishing process stages. Finishing will be more closely integrated with the final use. The role of technology supplier to the paper industry will naturally evolve to reflect all these changes. Metso is already actively collaborating downstream in the different paper-related business chains. This collaboration will be crucial for implementation of new business and technology innovations in P'||'&'||'P industry and Metso will certainly benefit from its catalyst role in this transition.

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An Experimental Study on the Dimensional Error in Ball End Milling (볼 엔드밀 가공에서 치수오차에 관한 실험적 연구)

  • 심기중;유종선;정진용;서남섭
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.7
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    • pp.62-69
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    • 2004
  • This paper presents an experimental study on the dimensional error in ball-end milling. In the 3D free-formed surface machining using ball-end milling, while machining conditions are varied due to the Z component of the feed and existing hemisphere part of the ball-end mill, the mechanics of ball-end milling are complicated. In the finishing, most of cutting is performed the ball part of the cutter and the machined surface are required the high quality. But the dimensional errors in the ball-end milling are inevitably caused by tool deflection, tool wear, thermal effect and machine tool errors and so on. Among these factors, the most significant one of dimensional error is usually known as tool deflection. Tool deflection is related to the instantaneous horizontal cutting force and varied the finishing cutting path. It lead to decrease cutting area, thus resulting cutting forces but the dimensional precision surface could not be obtained. So the machining experiments are conducted fur dimensional error investigation and these results may be used for decrease dimensional errors in practice.

Identification of country of production of veal meat by NIRS and by meat quality measurements.

  • Berzaghi, Paolo;Serva, Lorenzo;Gottardo, Flaviana;Cozzi, Giulio;Andrighetto, Igino
    • Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
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    • 2001.06a
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    • pp.1255-1255
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    • 2001
  • The study used 356 veal calf meat samples received from Finland (n=16), France (n=109), Italy (n=81) and The Netherlands (n=150). Calves were raised under experimental protocols that compared feeding and housing practices normally used in each county to treatments aiming at improving animal welfare. Samples were taken at the $8^{th}$ rib of Longissimus thoracis muscle 24h after slaughter, They were kept refrigerated ( $2-4^{\circ}C$) under vacuum package for 6d and then frozen ($-20^{\circ}C$) until meat quality evaluation. Measurements included pH, color (Hunter Lab system), shear force, chemical composition (DM, Ash, Ether Extract, collagen and haematin content), weight and area cooking losses and a sensory evaluation by a group of panelists. A sample of meat was ground with a blade mill and scanned in duplicate between 1100 and 1498 nm (FOSS NIR Systems 5000). WinISI software was used to develop a discriminating equation using NIR spectra (SNV-detrend, derivative=1, gap=4nm, smooth=4nm). The Proc ANOVA and DISCRIM of SAS were used for all the laboratory determinations. County of production had a significant (P<0.01) effect on all the parameters. However, discriminant analysis using any or few laboratory parameters resulted in great errors of county classification. A more accurate (98.8%) classification was obtained only when using all the laboratory parameters. NIRS classified correctly 354 of the 356 samples (99.4%). Provided with a larger data set, NIRS could be used to identify country of production of veal meat.

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Studies on the effect of heating conditions on the quality of soybean flours (대두분 품질에 미치는 가열처리조건에 관한 연구)

  • 이성갑;김준평
    • Journal of the Korean Professional Engineers Association
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    • v.17 no.4
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    • pp.28-39
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    • 1984
  • Experiments were carried out for the development of a processing method of soybean into full-fat or defatted flour, using two varieties of soybean (kwangkyo produced in Korea and Bragg produced in India) Samples were subjected to dry dehulling, size reduction and wet heat treatment processes to make soybean flours. The quality of soybean flours were evaluated, and the results obtained were summarized as follows. 1. Crude fiber content of dehulled soybean was under 3.0% which indicated satisfactory dehulling, and there was no significant difference in crude fibre content between two varieties. 2. When dehulled soybean was cracked into soy grits by a hammer mill, 98.71∼98.86% of the soy grit was in the range of 10∼18 mesh which was the optimum size of particle for quick and uniform penetration of heat into the intra-particle air spaces. 3. Moisture content of soy flour after steam treatment at 15 psig for 5 to 30 min was only 0.29∼1.68% which did not hinder the next milling operation. 4. From the color analysis of soy flours, it was observed that the dominant wavelength for all the samples are in a very narrow range from 575 to 581 nm and the color variation was from yellow to yellowish orange. Twenty to twenty five % higher reflectance was observed in the defatted flours than full fat flours. The % chroma of the defatted flour slightly increased as the duration of steaming of soy grits increased, whereas that of the full-fat flour did not. 5. The protein extractability in the defatted flour at pH 7.6 showed progressive decrease in solubility from 48.40% (Bragg), 75.20% (kwangkyo) for untreated flours to 9.75% (Bragg), 26.27% (kwangkyo) for 30 min steaming. But Kwangkyo variety showed twice higher protein extractability than Bragg variety.

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A identification of sprayed fire-resistive materials by near-infrared spectroscopy (근적외선 분광 분석법을 이용한 내화뿜칠재 일치성분석)

  • Cho, Nam-Wook;Shin, Hyun-Jun;Cho, Won-Bo;Lee, Seong-Hun;Rie, Dong-Ho;Kim, Hyo-Jin
    • Analytical Science and Technology
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    • v.24 no.2
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    • pp.85-93
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    • 2011
  • To protect the steel structure in a high story buildings from fire, the sprayed fire-resistive materials are applied during the construction. Current standard methods to check the quality of sprayed fire-resistive materials are real fire test in lab, which take a long time (several weeks) and expensive. In this study, a simple analytical method to check the quality of sprayed fire-resistive materials is developed using Near Infrared Spectroscopy (NIR). Total 9 kinds of sprayed fire-resisted materials and 3 kinds of normal sprayed material sets were used for the analysis. Each set of materials was 50 to 100 samples. Samples are grinded and make a fine powder. The spectral data acquisition was carried out using FT-NIR spectrometer with a integrating sphere. NIR methods successfully identify the sprayed fire resistive materials by a principle component analysis (PCA) after a vector normalization (SNV) pretreatment.

Effect of Different Milling Methods of Rice Flour on Quality Characteristics of Jeungpyun (쌀가루의 제분방법이 증편의 품질 특성에 미치는 영향)

  • 김영인;금준석;김기숙
    • Korean journal of food and cookery science
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    • v.11 no.3
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    • pp.213-219
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    • 1995
  • The characteristics of Jeungpyun were investigated with different milling methods of rice flour. The moisture content of Jeungpyun was similar to that of the rice flours. In the color of Jeungpyun, L-value was increasing but a and b-value were decreasing as its moisture content was increasing. The analysis on the texture of Jeungpyun showed that Jeungpyun by dry milling indicated the higher value in hardness and the lower value in springiness, cohesiveness and chewiness than Jeungpyun by wet milling. The test of the sensory characteristics for Jeungpyun showed that whiteness, moistness, springiness and chewiness was higher for Jeungpyun by wet milling. But the softness was lower. Overallquality of Jeungpyun by wet milling was higher than Jeungpyun by dry milling. Generally, Jeungpyun prepared by Pin-mill was the best in quality. In particular, Jeungpyun by wet milling was better for the added 80% of water and Jeungpyun by dry milling was better for the added 100% of water.

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Evaluation of the Screw Press Process in the Reconstituted Tobacco Sheet Making Process (판상엽 스크류 프레스 공정 특성 평가)

  • Sung Yong-Joo;Han Young-Lim;Kim Geun-Su;Rhee Moon-Soo;Ha In-Ho;Lee Ki-Yeul;Chun Eun-Soon;Song Tae-Won
    • Journal of the Korean Society of Tobacco Science
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    • v.28 no.1
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    • pp.36-42
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    • 2006
  • The papermaking process for a reconstituted tobacco sheet (RECON) has been preferred more because of the various merits such as a wide range of Recon products with better quality. The screw press is one of the very important process in RECON making process which divides the mixed raw materials into the soluble material and the insoluble material and could greatly affect the productivity and product quality. In this study, the characteristics of the screw press process in a Recon making mill were evaluated for two different RECON products. Three different efficiency index were proposed for the more detailed analysis of the screw press process. The result showed that the difference in the raw material might result in the difference in the efficiency and the properties of the extracts and the filter cake, especially in the HWS. The washing technique which applied in this experiment showed the amount of residual HWS in the fiber portion were not much changed by the each steps of the screw press.