Fe-Cu-M-(Si, B) (M = V, Nb, Mo, Ta, W) 합금의 연자기특성 (軟磁氣特性)

강일구,김희중,노태환,이명복,피우갑 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.4

Dependence of the effective permeability on annealing and the annealing-induced structural change for amorphous Fe_(73.5)Cu₁M₃Si_(13.5)B_9(M=V, Nb, Mo, Ta or W)and Fe_(73.5)Cu₁Nb₃(Si_xB_(1-x))_(22.5)(x=0∼0.8) alloys were investigated. Crystalline Fe_(73.5)Cu₁M₃Si_(13.5)B_9(M=V, Nb, Mo, W)alloys with α-Fe phase which was obtained by annealing at above T_x showed higher effective permeability than with amorphous phase, and the increase in permeability upon crystallization was large in the order of V$lt;W$lt;Mo$lt;Nb. For amorphous Fe_(73.5)Cu₁Nb₃(Si_xB_(1-x))_(22.5) alloys in the composition range from x=0.5 to 0.8, soft magnetic property was improved by crystallization. Moreover, in that composition range, the effective permeability increased with the Si content(x). Superior soft magnetic property of the high-Si alloys was attributed to both the small magnetocrystalline anisotropy and the low magnetostriction. The effective permeabilities measured at 1㎑ and 5 m0e for crystalline Fe-Cu-Mo-Si-B and Fe-Cu-Nb-Si-B(0.5≤x≤0.8) alloys were about 1∼2 × 10⁴, and it was comparable to that of the zero-magnetostriction Co-based amorphous alloys.

중부 평야지에서 사일리지용 옥수수 품종 선발에 관한 연구 : 파종시기가 사일리지용 옥수수의 생육특성 및 수량에 미치는 영향 Effect of planting time on the growth and yield of silage corn

김준식,김원호,김원영,김영진,한학석,김맹중 한국축산학회 1998 한국축산학회지 Vol.40 No.1

This experiment was conducted at theForage Research Farm of the Beef and Dairy Cattle Division, National Livestock Research Institute, Songhwan in 1992 and 1995 to investigate the effects of planting time (April 15, May 11, June 5) on the growth and yield of silage com(Zea mat's L.). In the plant height, P3144W and DK729 were taller than the others, as 301.6, and 296.3cm, respectively, and P3282 was the shortest as 247.7㎝ at the first planting time. P3144W and DK729 were taller than the others, as 303.6㎝, 281.7㎝, respectively, and P3282 was the shortest as 249.6㎝ at the second planting time. P3144W was the tallest as 276.9㎝. DK689 was the shortest as 246.1㎝ at the third planting time. The ear heights of P3144W and P3282 were 137.3 and 132.7㎝, respectively, and Suweon 19 was the shortest as 116.4㎝ at the first planting time. Those of P3144W and P3282 were as 135.9, 134.4㎝, respectively, and Suwoen 19 was the shortest as 112.1㎝ at the second planting time. P3144W was the tallest as 111.0㎝ and Suweon 19 was the shortest as 94.2㎝ at the third planting time. In the dry matter yield per ha, P3352, DK729 and P3144W were higher than the others as 18,957, 18,840, 18,743㎏, respectively, and P3282 was the lowest as 13,863㎏ at the first planting time. 64743 and P3352 were 18,183 and 17,874㎏, respectively, and Suwoen 19 was the lowest as 15,007㎏ at the second planting time. P3144W was the highest as 19,112㎏ and Suwnen 19 was the lowest as 14,793㎏ at the third planting time. The TDN yield per ha, of P3352, P3144W and DK729 were 13,552, 13,281 and 13,252㎏, respectively, and P3282 was the lowest as 9,793㎏ at the first planting time. 64743 and P3352 were higher than the others as 13,149 and 13,009kg, respectively, and Suwoen 19 was the lowest as 10,872㎏ at the second planting time. P3144W was the highest as 13,521㎏ and Suwven 19 was the lowest as 10,392㎏ at the third planting time.

O/W · W/O Emulsion의 Tribology 특성 연구

이봉구,임웅빈,오성모 원광대학교 생산 및 자동화기술연구소 1995 생산.자동화기술연구소논문집 : 원광대 Vol.- No.2

We have been so much interested in the lubrication of emulsion property recently. In particular, O/W and W/O type emulsion have a good property to be used in the Lubricative situation of several services. Therefore, in this section we have studied about the lubricational characteristics in Neat Oil, O/W and W/O type emulsion using the Falex, wear test machine. The result is as follows. 1. In the case of O/W and W/O type emulsion, the beginning friction coefficient than Neat Oil, but it becomes more excellent as the time passes. especially, the W/O type becomes the more excellent. 2. As the load increase, a change in temperature shows to us be nearly similar and all of them, the O/W type is the most excellent in the temperature characteristic. 3. In the beginning, the anti-wear characteristic of emulsion lowers, but after the some load has stability, O/W and W/O type is excellent in order of anti-wear characteristic. 4. In the regular hours, a change in the emulsion becomes settled, so the character of temperature is superior. specially, O/W type is predominant. Therefore, the emulsion in case of the O/W and W/O type are more excellent than Neat oil in the thermal stability and can improve the characteristics of tribology.

早期破膜에 關한 臨床的 考察

許湘,吳文愛,安東源,申吳永 대한산부인과학회 1972 Obstetrics & Gynecology Science Vol.15 No.7

한외여과된 돈혈청으로부터 DEAE - Sephacel Chromatography 에 의한 면역단백질의 분리

박우문,유익종,전기홍,이무하 한국축산학회 1997 한국축산학회지 Vol.39 No.1

Concentrated porcine serum with ultrafiltration 30KDa was purified with DEAF-Sephacel column chromatography. Buffer solution with pH 7 to 9 and buffer concentration with 0.01M to 0.05M, and NaCl gradient with 0M∼0.5M, 0M∼0.8M and 0M∼1.0M were used respectively for chromatographic purification. Optimal conditions were at pH 8.0, buffer conc. 0.03M and salt conc, 0M∼0.5M with immunoprotein concentration 82% and production yield 43%. Purified immunoprotein was identified in the molecular weight 50KDa and 15KDa by electrophoresis.

灌漑用水路의 水路損失率 算定에 관한 硏究

李基春,具滋雄,金在英,李宰泳,徐元明 전북대학교 농업과학기술연구소 1982 農大論文集 Vol.13 No.-

This study was carried out in order to estimate water losses in irrigation canals, which may be used to evaluate the water requirement for irrigation projects. The conveyance losses were measured by the inflow-outflow method, the seepage were measured by the ponding method, and the operation losses in the course of irrigation were calculated by comparing the two kinds of losses. The results obtained in this experiment were as follows : Conveyance losses per unit area of wetted perimeter per second by the main irrigation canal, the secondary irrigation canal and the tributary irrigation, canal, were 1.399x10-5m3/m3/sec, 5.154x10-5m3/m3/sec, and 2.670×10-5m3/m3/sec respectively in the Goong-sa area. And they were 1.934x10-5m3/m3/sec, 2.149x10-5m3/m3/sec, and 4.558x10-6m3/m3/sec respectively in the Seong-dug area. Seepage losses per unit area of wetted perimeter per second by the secondary irrigation canal and the tributary irrigation canal, were 2.180×10-6m3/m3/sec and 2.168×10-6m3/m3/sec in the Goons-sa area. 1.150x10-6m3/m3/sec and 1.084x10-6m3 /m3/sec in the Seong-dug area respectively. Operation losses per unit area of wetted perimeter per second by the secondary irrigation canal and the tributary irrigation canal, were 4.936×10-5m3/m3/sec and 2.453×10-5m3/m3/sec in the Goong-sa area, 2.034×10-5m3/m3/sec and 4.450×10-5m3/m3 /sec in the Seong-dug area respectively. Conveyance, seepage and operation losses in the Goong-sa area were 6.7%, 94.6%, and 14.0% more than those in the Seong-dug area. Operation losses amount to about 17 times as much as seepage losses in the Goons-sa area and about 29 times in the Seong-dug area .The seepage losses depend much on the soil texture. ranging from 7.437×10-7m3/m3/sec to 2.430x10-6 m3/m3/sec. Water loss rates in the main irrigation canal, the secondary irrigation canal and the tributary irrigation canal, were estimated as 8.49%. 37.27%, and 9.8l%, respectively in the Goong-sa area. And they were estimated as 15.10%, 32.67% and 13.73% respectively in the Seong-dug area.

용융철중의 텅스텐의 거동

이계완,조정완,김길무 대한금속재료학회(대한금속학회) 1972 대한금속·재료학회지 Vol.10 No.1

CO·CO₂가스 분위기하에서의 Fe-W 용융체에 대한 슬래그-용강간의 반응을 1,650℃ 및 1,750℃에서 검토하였다. Pco/Pco₂=5.0 이상에서 텅스텐의 슬래그-용강간의 분포, [W]/(WO₃)는 다음 반응평형에 따라 결정된다. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 슬래그-용강간의 반응에 대한 평형항수, K_f는 1,650℃의 경우 Pco/Pco₂=3.3이하에서 점차로 감소하고, 1,750℃의 경우는 Pco/Pco₂=5.0 이하에서 급격히 감소한다. 슬래그상중의 (FeO)함량은 Pco/Pco₂가 감소함에 따라 다음 반응에 의하여 증가한다. [Fe]+CO₂=(FeO)+CO 공기중에서 용해할 때 슬래그-용강간의 반응을 다음과 같이 추정하였다. (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31 Slag-metal reactions for iron-tungsten melts under CO·CO₂ gas atmosphere are investigated at 1,650℃ and 1,750℃. When Pco/Pco₂ is more than 5.0, slag-metal distributions of tungsten, [W]/(WO₃), can be determined by the following reaction equilibriclm. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 The equilibrium constant, K_f, for the slag-metal reaction slightly decreases when Pco/Pco₂ is less than 3.3 at 1,650℃, and suddenly decreases below Pco/Pco₂=5.0 at 1,750℃. (FeO) contents of slag phase increase, as Pco/Pco₂ decrease according to the following reaction, [Fe]+CO₂=(FeO)+CO, An estimation for slag-metal reactions on open melting is as follows; (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31

Lactobacillus reuteri의 Bacillus anthracis Sterne 34 F2 대한 항균효과

권남훈,김소현,배원기,김지연,임지연,노경민,김준만,안종삼,허진,박용호 한국수의공중보건학회 2001 예방수의학회지 Vol.25 No.4

Antimicrobial activities of three different Lactobacillus strains (Lactobacillus reuteri, L. bulgaricus, and L. casei) against Bacillus anthracis were determined on the Mueller Hinton Agar containing each culture supernatant obtained from 3 different growth conditions (MRS without glycerol, MRS with 0.5 M glycerol and 0.25 M glycerol solution).Though antimicrobial activity of L. reuteri in the first two conditions was not better than the others', the activity was significantly higher than those of others in 0.25 M glycerol solution. This prominent effect might be attributable to reuterin, produced by L. reuteri using glycerol. We could detect the presence of reuterin in the supernatant of 0.25 M glycerol solution with 500 MHz Nuclear Magnetic Resonance (NMR). The result of minimum bactericidal concentration (dilution fold) against spore of B. anthracis has revealed that reuterin had strong effect against anthrax spores. To examine any changes of antimicrobial activities of the probiotics, the probiotics were treated with different pH concentration, pepsin or trypsin digestion. The study has revealed that antimicrobial activities of L. bulgaricus and L. casei were significantly decreased, but reuterin activity was not entirely affected by any of these treatments.

한우의 일당 증체량에 연관된 DNA Marker 의 규명

여정수,박노형,김재우,이문연,장태경 한국축산학회 1999 한국축산학회지 Vol.41 No.4

DNA markers related to daily gain from 287 heads( 173 heads of bull and 114 heads of steer) of Hanwoo were found with distinct 3 kinds at 4.6, 3.6 and 2.8kb using DNA fingerprinting with M13/HaeIII and 2 kinds at 5.6 and 2.1kb with M13/Hinfl. It was evidently considered that 3 specific markers influenced to grow in Hanwoo, negative effect in 4.bkb and positive in o hers(3.6 and 2.8kbs) for daily gain and especially single effect at 3.bkb for bulls and combined effect of 4.6 arid 2.8 markers for steers were distinctive to daily gain with M13/HaeIII. Pedigreed pattern of specific markers with M13/HaeⅢ were observed with DNA bands at 2.8 and 3.bkb were dependent on sire. Under results of this research culling of 4.bkb marker and selection of 3.bkb marker in Hanwoo population can be expected to improve above 35㎏ at market body weight.

급냉응고/분말야금법으로 제조한 Al-Fe-V-Si-Ti-W 합금의 고온크립거동

김인수,김낙준,남수우,위당문,오승철,최상우 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.11

The elevated temperature creep properties and microstructural stability of RS/PM Al-10Fe-1.3V-2Si-1Ti-1W(wt.%) alloy have been investigated. The alloy showed high stress exponent of 12 to 18 and activation energy of 237 to 808 kJ/㏖, which was strongly dependent on the temperature and stress. The unusual creep behavior of the dispersion strengthened alloys cannot be described satisfactorily by current creep laws, Recently, Ro¨sler and Arzt proposed a new model assuming thermally activated dislocation detachment from dispersoids exerting an attractive force. In the present study, experimental evidence was achieved for the presence of attractive interaction between the dislocation and the dispersoids using TEM observations. The creep behavior of the alloy was analyzed using the model proposed by Ro¨sler and Arzt, and the experimental data were consistent with the prediction based on the model. It has been confirmed that the high temperature deformation of the alloy was dominated by the dislocation creep at the temperature range of 400 to 480℃, but the diffusional creep at the interface between powders also contributed to the deformation above 430℃.