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Cement 粉碎에 있어서 Ethylamine類 粉碎助劑가 미치는 影響
金昺圭,梁斗錫,金石柱 成均館大學校 1981 論文集 Vol.30 No.-
所要 粉碎動力費를 節減하기 위하여 有機溶媒를 粉碎助劑로 擇하고 液相接觸으로 그 粉碎效果를 向上시키는 硏究는 여러 학자들에 의해 進行되어 왔다. 筆者는 이에 立脚하여 우리나라에서 動力費節減이 要求되는 Cement 製造를 대상으로 하여 Ethylamine 類를 粉碎助劑로 택하고 더욱 接觸確率을 증가시키기 위하여 氣相으로 接觸시켜 Cement 粉碎效果를 硏究하였다. 또한 그 原因으로 추정되는 吸着現象을 아울러 測定하여 粉碎效果와의 관계를 檢討하였더니 粉碎가 시작된 후 0∼6 時間內에서는 각종 첨가물이 거의 없는 상태, 즉 Clinker 單一系의 粉碎現象과 비슷한 粉碎傾向을 보여 주었고, 6∼8時間 사이에서 급격한 吸着能의 증가현상을 보여주었다. 이 때부터 粉碎率이 첨가물질에 의한 特有의 증가현상을 보여주고 이Td서 吸着能이 粉碎率과 깊은 관계가 있음을 알았고, 吸着能이 큰 물질일수록 粉碎效果가 더욱 좋은 結果를 보여주어서 粉碎效果는 吸着能과 吸着量에 比例됨을 認知하였다. 더욱 構造物材料로서의 本質인 物性을 測定하여 이에 따르는 使用許容範圍를 提示하였으며 結果的으로 1. 이들 粉碎助劑의 添加量이 증가하면 粉碎效果도 증가한다. 2. 粉碎效果는 Ethylamine 類가 Ethanol보다 떨어졌고, 沸點이 높은 tri-Ethylamine이 di-Ethylamine 보다 좋았으며, Ethanol>tri-Ethylamine>di-Ethylamine順으로 됨을 알았다. 3. Ethyamine 類의 Cement 粒子에 對한 吸着現象은 Ereundilich 吸着等溫式과 恰似했으며, 어느 범위내에서는 粉碎助劑의 吸着量이 증가함에 따라 粉碎效果가 좋아진다. 4. 粉碎效果가 좋을수록 Cement의 物性을 다소 감소시키고 있으나 構造物의 原資材로 사용하는 경우 그 使用分野에 따라 큰 지장이 없이 사용할 수 있는 것으로 看做된다. Most expenses of production in cement industry are electric power, therefore, many scientists had researched through various ways for saving power cost. Especially, they are an urgent problem, for Korea electric power costs so expensively. As one of the means of saving power, by crushing aid of organics (i.e. primary, secondary alcohol series, fat, or resins), it was attempted to prevent the growth of secondary particles on liquid contacting system. But it was not sufficient on heterogeneous dispersion system. In this experiment, the increasing of crushing effect was investigated in gaseous contacting system and 100℃ of not influencing upon cement products. Then, organic crushing aid were used di-Ethylamine (bp 55.4℃) and tri-Ethylamine (bp 89.7℃) in range of 0.1-0.5wt. % concentration. Thus, saving power and properties of structures depend on factory data. On the standard of compared data, a continuous method in dry crushing was adopted to a practical operation condition. Therefore, it must be analysed by batch method in a possible application because it is better than continuous method. The computation on power should be done by crushing ratio, directly, and it become clear tendency of specific surface mean diameter of particles to be decreased according to hour limit. Also, the increment of crushing effect had been referred to the adsorption phenomena on cement particles by the vapor of organic substance with crushing aid in the experiment of crushing. Then, the adsorption phenomena has researched by Gas-chromatograpy method, because of it's convenience and accuracy. Organic substance had been used as the adsorbate (i.e. di-Ethylamine and tri-Ethylamine). Through the experimental investigation, the following results were obtained: 1. Power saving of the cement crushing system added organic substance is 2.6% better than that of a simple system of clinker crushing. 2. In crushing, the order of effectiveness are Ethanol tri-Ethylamine and di-Ethylamine. i) Ethanol is 20.8%(in range of 0.4-0.5wt%) ii) di-Ethylamine is 13.7% (in range of 0.4-0.5wt%) iii) tri-Ethylamine is 15.4% (in range of 0.4-0.5wt%) 3. The compressible strength of the cement organic substance the order of decrease are Ethanol, tri-Ethylamine, di-Ethylamine. ⅰ) Ethanol is 5-6% (decrease) ⅱ) di-Ethylamine is 4.1% (decrease) iii) tri-Ethylamine is 4.3% (decrease) 4. Absorbed amount of the organic solvents is an important factor of cement crushing system; the grinding rates are increased when the amount of grinding aid are increased. 5. The adsorptivity increased in the order of Ethanol, tri-Ethylamine, di-Ethylamine, di-Ethylamine. 6. Adsorption phenomena of Ethylamines on cement have been adsorbed to show a tendency similar to the Freundlich's adsorption isotherm equation. 7. After 6 hours of the crushing time when the increase in the crushing efflciency has taken place, the amount of adsorption has rapidly increased, while the amount of adsorption has shown almost negligible increase. 8. Crushing efflciency has been increased with the increasing amount of Ethylamines absorbed on cement i.e, the higher the absorptivity is, the better the crushing efflciency is.
유석호 연세대학교 인문과학연구소 1997 人文科學 Vol.76-77 No.-
Le roman rabelaisien commence toujours par l´appellation aux lecteurs imaginaires que le narrateur essaie d´instaurer a、 l´exte´rieur de l´espace romanesque. Ce besoin du contact imme´diat avec le lecteur est partiellement le re´sultat de la situation nouvellement impose´e aux e´crivains du 16^e sie、cle, gra^ce a、 l´invention de l´imprimerie. Car Rabelais e´crit pour la premie、re ge´ne´ration d´acheteurs de livres, ce monde he´te´roge´ne et anonyme que l´e´crivain doit fac??onner et attirer au cours de son e´criture. La situation narrative de la litte´rature orale du Moyen a^ge est en fait le reflet de la situation re´elle de l´auteur devant son public, qui cherche a、attirer l´attention de l´auditoire et a、 maintenir le contact avec lui. La fiction de l´oralite´ telle que conc ??oit Rabelais re´ve、le aussi la ne´cessite´ de nouer une complicite´ ludique avec le lecteur a、 travers le dialogue permanent et familier. Ce n´est donc pas une lecture passive voire consciente au cercle joyeux des Pantagrue´listes pur appre´cier a、 son gre´ le monde plein de fantaisie et de verve comique du roman rabelasien. Car pur Rabelais, narrer une histoire est aussi un acte pour entrer en propos et en vin. Kittay fait remarquer que le roman rabelaisien se caracte´rise surtout par le changement de la situation narrative au cours du re´cit : un e´pisode commence souvent par le dialogue servant a、 le motiver, auquel est relie´e ensuite la narration proprement dite et se termine enfin dans une situation dialogique nouvellement introduite par le narrateur pour ane´antir lui-me^me la cre´dulite´ du lecteur. L´attitude ironique du narrateur sugge、re ainsi qu´il ne s´agit pas d´une histoire ve´ritable qu´il raconte nais une sorte de jeu qui ne´cessite la complicite´ ludique avec le lecteur. Au fur et a、 mesure que l´identite´ fictive du narrateur disparai^t a、 partir du Tiers Livre, il se produit une se´rie de modifications sur le plan narratif. La fiction de l´oralite´, qui reliait auparavant le conteur a、 son public, s´approche de、s lors de celle de devis, anime´e principalement par les personnages a、 l´inte´rieur de l´espace romanesque. De la、 vient donc l´importance des histoires intercale´e chez Rabelais, qui, au dela、 de leur unite´ se´mantique, servent peu ou prou a、 apporter de nouvelles visions au sein des e´ve´nements et ainsi tiennent lieu de commentaires directs du conteur. Me^me si Rabelais a commence´ le cycle pantagrue´lique avec l´intention limite´e d´une parodie, sa perspective litte´raire ne tarde pas a、 l´associer avec sa profondeur intellectuelle ; et c´est san doute dans la fiction de devis, qui favorise des spe´culations de toute tendance sans se soumettre a、 la line´arite´ d´une intrigue, qu´il trouve la frome narrative plus libre et mieux adapte´e a、 sa veine verbale que la narration lie´e principalement a、 la personne du conteur. Ainsi l´oeuvre de Rabelais montre-t-elle-une sorte d´enque^te permanente sur les possibilite´s de l´e´criture et des formes narratives d´une varie´te´ e´tonnante, ce qui constitue sans doute sa modernite´.
Ralu-Pack 250YC 를 충전한 충전탑에서 암모니아가스 제거에 관한 연구
김석택 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5
In this study a packed tower was selected for the treatment apparatus of NH_3 gas produced in industry. Formerly, latticework packing has been used in preventive facility of treatment of NH_3 gas. However, recently metallic Ralu-Pack 250YC, structured packing, is usually being used in petrochemical production plant. This study is for the application the packing to the NH_3 gas treatment in wet scrubbing process. In Air/water system, hydraulic pressure drop dependent of specific liquid load and gas capacity factor was continuous and parallel from graph. The tower height can be determined by the number of transfer unit and the height of transfer unit influenced on liquid distribution.
전력계통 안정화용 초전도 에너지 저장장치의 최적정격 결정
황석영,이혜경 단국대학교 1999 論文集 Vol.34 No.-
Recently superconductive magnetic energy storage(SMES) has been studied for stabilizing electric power system due to simultaneous control of active and reactive power, high efficiency and rapid response. In this paper, a method for optimum determination for the required ratings of SMES for power system stability is proposed. In the method, maximum operating voltage level and ratio of minimum/maximum charging current of superconducting coil are used as important parameters.
金奭株 瑞逸專門大學 1985 論文集 Vol.5 No.-
It is often said that a work reflects its author's life-trace and thought-itinerancy as well. D. H. Lawrence's works are considered to be keenly linked with his own life which was characterized by "loyalty to his own self," "his peculiar prejudiced view point of sex" and "anti-mechanical cultivation." The purpose of this paper is to try an approach to his life-long preoccupation of sex relations through his works, expecially through his novels. As shown in his early masterpiece, <Sons and Lovers>, the distorted love from his mother prevented him from establishing normal relationship with a lady and also ac-quiring the independence of his real self, from which he tried to escape in vain. After his mother's death, he could get out of his mental wandering and schizopherenia his novel, <Sons and Lovers>. But shuch opportunity of his emancipation was not made by his own will. Accordingly, it could not avoid some limitation in its durability and its attribute. His conflict and wandering showed up in many other forms in his later works. He adhered to some peculiar relation theories between man and woman; he as-serted " equilibrium" in <The Rainbow> and <Women in Love>. "phallicism" in <Aaron's Rod>,<Kangaroo> and <The Plumed Serpent> and "phallic tenderness" in <Lady Chatterly's Lover> and <The Man Who Died>. In the short novel <The Man Who Died>, he pursued the physical rebirth and resurrection tenaciously. But such changes in his thought was nothing but reflection of his own physical condition and consciousness of death, Furthermore, his theory of sex relations was full of his own dogma and prejudice. Neverthless, his defiant and critical attitude toward the modern civilization is regar-ded as very meaningful and suggestive one in the respect of restoration/ recurrence of pure humanity.
高錫梵 全北大學校 敎育大學院 1983 敎育論叢 Vol.3 No.-
Themodynamic properties such as sublimation pressures, enthalpies and entropies of sublimation, enthalpies and entropies of solid argon are calcuated from O K to the triple point, using the vacancies-in -solid model. The Mie-Lennard-Jones 12, 6 potential in the uniform potential field is used. The results are compared with the calorimetric and sublimation pressure values, and are in a good agreement with the available calorimetric and sublimation pressure values.
濟州地方에서 쪽파(Allium ascalonicum L.)의 端境期 栽培 可能性에 關한 硏究
秦石天,張田益 濟州大學校 亞熱帶農業硏究所 1987 亞熱帶農業硏究 Vol.4 No.-
濟州在來 쪽파의 여름철 栽培를 爲하여 種球에 對한 貯藏溫度와 期間, GA₃및 ABA處理와 日長 및 遮光程度를 달리하여 出現 및 生育에 미치는 影響을 究明하고, 種球와 生育中인 植物體內의 GA 및 Auxin類似物質의 含量을 分析한 結果는 다음과 같다. 1. 濟州在來 쪽파의 出現 및 初期生長促進은 4℃의 低溫에서 30日間 貯藏한 것이 가장 良好하였다. 2. GA₃處理는 濃度間에 뚜렷한 出現促進效果가 없었으나 生長은 繼續 增加되었다. 3. ABA處理는 出現을 遲延시켰으나 濃度가 높을 수록 地上部의 生長도 抑制되었다. 4. 여름철의 自然日長과 16時間 日長區에서 地上部 生長이 良好하였고 8時間과 24時間區에서는 不良하였다. 5. 50% 및 85% 遮光處理한 것에서 草長이 길어졌고 露地에서는 伸長이 緩慢하였다. 6. GA 및 Auxin類似物質의 含量은 種球의 常溫貯藏과 生育中인 것에서 類似하였고 4℃에서 30日間 貯藏한 區에서 GA와 Auxin類似物質含量이 높았다. 7. 以上의 結果로서 濟州在來 쪽파의 여름철 栽培는 可能하지만 休眠性을 비롯한 生理的인 諸部分은 좀 더 硏究해야 될 것이라 생각되었다. Effects of bulb treatments such as cold storage temperature and period, application of GA₃ and ABA, day length and shading on emergence and growth of shallot were determined to establish cultural practices for Cheju native shallot in summer. The concentraton of GA and auxin like substances in bulbs for planting and growing plants was also determined. The results obtained are follow as; 1. Storaging bulbs at 4℃ for 30 days was suitalbe for promoting emergence and early growth of Cheju-native shallot. 2. Application of GA₃ did not promote emergence but increased growth continuously. 3. Application of ABA delayed emergence and the higher the concentration of solution was, the more the growth was retarded. 4. Shallot plant growed better under natural and 16 hours lighting than under 8 and 24 hours lighting. 5. Shallot plant growed better under 50 and 85% shading than under natural sun light. 6. Concentration of GA and ABA like substances was similar in bulbs storaged at normal temperature and growing plants but was higher in plants emerged from bulbs storaged at 4℃ for 30 days. 7. In consideration of the above results the summer cultivation of Cheju-native shallot determined to possible, but including the shallot dormancy, physiological subject and the others ought to make researches further in future.
김석택,신남철,김장호 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
Latticed packing is easy controled because It is small changed in processing. Latticed packing pilot is designed middle and small scale of industrial, domestic, and stock farming wastewater treatment. Latticed packing using pretreatment industrial wastewater is applicated chamical complex material, spice and strock farming wastewater. Result of examination in 3℃ is reserved 60% of denitronazation, 90% over BOD, and 85% over COD.