간행물
한국응용과학기술학회지 KCI 등재 The Korean Society of Applied Science and Technology
- 발행기관 한국응용과학기술학회(구 한국유화학회)
- 자료유형 학술지
- 간기 격월간
- ISSN 1225-9098 (Print)2288-1069 (Online)
- 수록기간 1984 ~ 2024
- 주제분류 공학 > 화학공학 공학 분류의 다른 간행물
- 십진분류KDC 575DDC 665
권호리스트/논문검색
Vol.14 No.1 (1997년 5월) 12건
1.
1997.05
구독 인증기관 무료, 개인회원 유료
4,600원
2.
1997.05
구독 인증기관 무료, 개인회원 유료
There were a dramatic change in technical aspect in Korean detergent industry for past 5~6 years. we, detergent industries, have been trying to find out a new way of production and better goods on environment as well as men to decrease domestic wastes and water pollution. In addition, increasing expense for transportation, storage and displaying give us another difficulties. Compact detergents are best method to solve this problems. Detergent ingredients, formulations and process were concentrated to the development of compact detergents. Now, I'll introduce about the recent trends in technical aspect and near future's prospects in Korean detergent industry.
4,300원
3.
1997.05
구독 인증기관 무료, 개인회원 유료
Furfurylidene acetophenone derivatives were synthesis, it was measured that nucleophilic addition made use of UV at a wide pH 1.0~13.0 range in 30% dioxane-H2O solution, 25℃. On the basis of general base catalysis, substitutent effect, confirmation of nucleophilic addition products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It may be concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion: Above pH 10.0. sulfide anion adds to the double bond (Michael type addition), a part having no concern with pH, addition reaction to double bond is initiated by addition of neutral thiourea molecule. From the result of measurement the reaction rate, nucleophilic addition of furfurylidene acetophenone derivatives confirmed to the irreversible first order. Through measurement the substituent effect. It found that reaction rate was accelerated by electron attracting group. On the basis of these findings, nucleophilic addition of thiourea for the furfurylidene acetophenone derivative was proposed a fitting mechanisms.
4,000원
4.
1997.05
구독 인증기관 무료, 개인회원 유료
본 연구는 간을 함유하지 않은 소시지와 각각 5%, 15%, 30%, 45%의 간을 함유한 세절형(sliceable)과 퍼짐형(spreadable) 그리고 훈연 퍼짐형(smoked spreadable) 소시지를 제조하여 간소시지의 산패도를 측정하여 보고하는 바이다. 연구결과를 요약하면 다음과 같다. 1. 소시지의 조지방 함량은 간의 함량이 증가할수록 조지방 함량이 유의하게 낮아지는 것으로 나타났다. 제조공정별로 살펴보면 간 45% 함유 소시지의 경우에는 제조공정에 상관 없이 15%이하의 낮은 지방 함량을 나타내어 간의 함량에 따라 소시지의 지방 함량에 유의한 차이가 있음을 알 수 있었다. 2. 제조일에는 세절형 소시지가 퍼짐형 소시지보다 산가가 유의하게 높게 나타났으며 훈연한 퍼짐형 소시지도 훈연하지 않은 퍼짐형 소시지의 산가 1.74~1.80보다 더 높은 산가를 나타내었다. 산가는 종류별로 산발적인 차이를 보이나 간의 첨가량이 증가할수록 산가가 다소 증가하는 경향이 나타났다. 3. 간 소시지의 저장시 과산화물가는 간의 함량과 제조공정에 상관없이 유의한 차이를 나타냈으며 저장기간이 경과함에 따라 증가하여 제조일에는 27.19~29.43이었으나 저장 14일에는 85.35~88.56으로 저장 28일에는 117.86~145.14로 증가하였다. 4. Malonaldehyde 함량은 간의 함량에 따른 차이는 없었으나 제조일에는 세절성 소시지가 2.72~2.73μg/g으로 가장 높은 malonaldehyde 함량을 나타내었으며, 훈연하지 않은 퍼짐형 소시지군이 1.32~1.33μg/g으로 가장 낮은 수치를 나타내었다. 저장기간에 따라 malonaldehyde의 함량은 증가하였다.
4,200원
5.
1997.05
구독 인증기관 무료, 개인회원 유료
It is the problem point of stability for this study to produce cosmetics and to occur in the circulation process, and specially in a case of alcoholic toilet water the precipitation materials to float on content materials has study on the solubility of perfume, and it has practiced in order to examine the problem point whether the raw materials of plastic vessel is or not harmful in content materials. In testing result, A study on stability of alcoholic toilet water is above all the precipitation materials which floats in content materials, and It is appeared by combination ratio to the raw materials of perfume, ethanol, solubilizer and refining water etcs, and in second the alkali degree which has gushed out of glass vessel can understand the thing that the change of PH is largely increased following to the passage of time, and in third the harmful component of content materials out of raw material in plastics vessel must certainly consider a stability and a safety in quality control of products.
4,000원
6.
1997.05
구독 인증기관 무료, 개인회원 유료
Spin finish(NSFs) for synthetic fiber were prepared. NSF-3 was proved to be the best spin finish by testing the properties and emulsion stability, etc. of NSFs. NSF-3 prepared by blending of spindle oil 70g, paraffin wax 10g, glyceryl mono-oleate 5g, POE(10) nonylphenyl ether 4g, POE(20) sorbitan tri-oleate 4g, Na-dioctyl sulfosuccinate 4g, antistatic agent 2g and water 1g was excellent in its characteristics. Optimum physical conditions of nylon filament treated with NSF-3 according to the number of revolution of oil roller were obtained at conditions of 5.5rpm in the number of revolution of oil roller, 1.21% of oil pick up, and denier 69.2D.
4,000원
7.
1997.05
구독 인증기관 무료, 개인회원 유료
Triacylglycerols of the seeds of Ginkgo biloba have been resolved by high-performace liquid chromatography(HPLC in the silver-ion and reverse-phase modes. The fatty acids were identified by a combination of capillary gas chromatography and gas-chromatography /mass spectrometry as the methyl and /or picolinyl ester. The main components are C18:2Ω6(39.0mol%), C18:1Ω7(asclepic acid 21.5mol%), and C18:1Ω9(oleic acid, 13.8mol%). Considerable amounts of unusual acid such as C20:3δ5,11,14 (5.7mol%), C18:2δ5,9(2.8mol%), and C18:3δ5,9,12(1.6mol%), were checked. In addition, an anteiso-branched fatty acid, 14-methylhexadecanoic acid, was also present as a minor component(0.9 mol%). The triacylglycerols were separated into 17 fractions by reverse-phase HPLC, and the fractionation was achieved according to the partition numnber(PN) in which a δ5-non methylene interrupted double bond(5-NMDB) showed different behaviour from a methylene interrupted double bond in a molecule with a given cahinlength. Silver-ion HPLC exhibited excellent resolution in which fractions(23 fractions) were resolved on the basis of the number and configuration of double bonds. In this instance, the strength of interaction of a δ5-NMDB system with silver ions seemed to be weaker than a methylene interrupted double bond system. The principal triacylglycerol species are as follows ; (C18:2Ω6)2/C18:1Ω7, C18:1Ω9/C18:1Ω7/C18:2Ω6, (C18:1Ω7)2/C18:2Ω6, C16:1Ω7/C18:1Ω9/C20:3δ5,11,14, C16:1Ω7/C18:1Ω7/C20:3δ5,11,14, C18:1Ω9/C18:1Ω7/C18:2Ω6, C18:1Ω9/C18:2δ5,5/C20:3δ5,11,14, (C18:1Ω7)2/C18:2Ω6 and (C18:1Ω9)2/C18:2Ω6, while simple triacylglycerols without C18:2Ω6)3 were not present. Stereospecific analysis showed that fatty acids with δ5-NMDB system and saturated chains were predominantly located at the site of sn-3 carbon of glycerol backbones. It is evident that there is asymmetry in the distribution of fatty acids in the TG molecules of Ginkgo nut oils.
4,900원
8.
1997.05
구독 인증기관 무료, 개인회원 유료
PFO(pyrolized fuel oil) and C10+ oil, which are the residual heavy oils form a NCC(naphtha cracking center), were heat-treated to produce the precursor-pitch for carbon materials. After PFO was initially distilled near 300℃ to separate the volatile matters recovering as high-quality fuel oil, the residuum of nonvolatile precursor-pitch was then thermally pyrolized in the temperature ranges from 350℃ to 450℃. Spinnable isotropic pitch with the softening point of 200℃ and the toluene insolubles of 36wt% was obtained at 365℃, and then was successfully spun through a spinneret(0.5mm diameter). After spinning, an isotropic carbon fiber of 25μm diameter was obtained via oxidation and craboniation procedures. Mesophase spherules began to be observed from the product pitch pyrolized at 400℃, and bulk mesophase with a flow texture was observed above 420℃. In the case of C10+ was the feed was polymerized in the presence H2SO4 at room temperature to increase the molecular weight and then heat-treated gradually up to 200~250℃. The products obtained with the softening point of 80~190℃ were carbonized at 500 and 1000℃ to examine the morphology.
4,200원
9.
1997.05
구독 인증기관 무료, 개인회원 유료
In this research, ultra-thin films of organic charge transfer complex were deposited on to ordinary microscope slide-glass subtrates with a Langmuir-Blodgett technique. π-A isotherm characteristics of these complex were studied in order to find optimum conditions of deposition by varying temperature of subphase, compression speed, and spreading amount. Transfer ratio of these films were studied during the process of deposition. The UV-visible absorbance spectra of LB films were measured to find state of deposition by varing layer number. The observed optimum conditions of surface, pressure, spreading amount, and dipping speed for depositing LB films(Y-type) were 38m/Nm, 150μl and 5mm/min, respectively. Since the tansfer ratio is close to 100%, the monolayer on the subphase seems to be well transferred to the solid substrate. The thickness of the film was well-controlled as the UV-vis absorbance of films were changed linear according to the number of layers.
4,000원
10.
1997.05
구독 인증기관 무료, 개인회원 유료
The synthetic method of pyrazole was performed by 1,3-dipolar cycloaddition with dipolarophile instead of the reaction between diazomethane and acetylene. The cycloaddition mechanism and reactivity of 3-phenyloxadiazole derivatives with dipolarophiles was investigated. In order to investigate the mechanism and reactivity of this cycloaddition, the effect of substituents having various kinds of electron withdrawing or releasing groups were examinated. Considering the effect of substituents, an electron withdrawing group attached at the 4-carbon position in 3-phenyloxadiazole derivatives decrease the reaction rate because of the lack of electron density in oxadiazole ring. The reaction rate of 3-phenyloxadiazole derivatives with dipolarophiles were more conveniently measured using UV than using a volumetric analysis which was used before. From the result of this study, it was that the cycloaddition was found to be a first-order reaction depending upon the concentration of 3-phenyloxadiazole only.
4,000원
11.
1997.05
구독 인증기관 무료, 개인회원 유료
This study was carried out to separate and identify the antioxidative substances in persimmon leaves. The antioxidative substances in persimmon leaves were extracted by methanol. The extract was fractionnated by SEP-PAK cartridge colum. From these results five fractions(F-I~V) were obtained. Antioxidative activity of each fractions was examined by the DPPH methord. The F-II, III and IV showed antioxidative activity and among them F-II and F-III showed the strongest. Five frations were separated by TLC using ethylacetate : chloroform : formic acid : H2O(8 : 1 : 1 : 1 v /v) as the solvent. From these results were obtained spots of Rf 0.71, 0.35 and 0.25. This spots were scraped from the plate and extracted by methanol. The extracts thuse obtained were used for examination of identify by TLC, UV /VIS-spectrophotometer and HPLC. Among them spot of Rf 0.71 were demonstrated to catechin and the spots of Rf 0.35 and 0.25 was suggested to polyphenol substances.
4,000원
12.
1997.05
구독 인증기관 무료, 개인회원 유료
Fluorescent anionic oligo surfactants were synthesized by the condensing products of long chain alkylvinylether-maleic anhydride cooligomers and resorcinol including dye structures. Their various surface activities and dispersing action were studied on the aqueous solution. These oligo surfactants exhibited a remarkable surface tension lowering property, lower foaming and a large dispersing action for the particles of α-copper phthalocyanine blue. Further it was ascertained that the binding of oligo surfactant onto the pigment surface caused the deviation towards lower wavelengths at the maximum fluorescent intensity as compared with aqueous oligo surfactant solutions, These surface active properties of the oligo surfactants may be attributed to rigid and hydrophobic structure of dye groups, besides surface-active groups of alkylether groups and carboxylic group of the anionic oligo surfactants.
4,000원
