• Applied Biological Chemistry
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• v.32 no.3
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• pp.249-254
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• 1989

This study was conducted to clarify the relationships between the inorganic constituents contents and the contents of catalpol and free sugars in the rhizoma of Rehmannia glutinosa. Nitrogen contents in rhizoma was positively correlated with the contents of catalpol and ethanol extract, whereas it was negatively correlated with that of ash, galactose and fructose. Calcium contents in rhizoma was highly negatively correlated with the contents of catalpol, ethanol extract and water extract. However, the calcium contents positively correlated with that of ash, acid insoluble ash, fructose and galactose in R. glutinosa. The catalpol cotents was negatively correlated with the contents of ash, galactose and fructose, whereas positively correlated with that of ethanol extract and water extract, and the correlations between extract contents and ash contents showed highly negative significance.

• Resources Recycling
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• v.33 no.1
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• pp.48-57
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• 2024

This study aimed to improve utilization of the Class C vinyl waste generated in rural areas based on a preliminary investigation on the use of eco-powder, generated through pyrolysis, as a raw material for plastic. The efficiency of pre-processing treatments in controlling ash content of the generated eco-powder and its effect on the basic properties of manufactured plastic were evaluated. The basic properties included ash content of the compressed eco-powder at different levels of ash content, impact strength, flexural strength, and tensile strength. The experimental results confirmed that pre-processing improved the separation efficiency of soil particles and vinyl waste through physical impact. The eco-powder with ash content of less than or equal to 26% was found to satisfy the target performance during impact strength, flexural strength, and tensile strength evaluation. Thus, it was confirmed that the Class C vinyl waste, having low utilization and recovery rates, could be effectively utilized as a plastic raw material after optimum thermal treatment and physical processing using the eco-powder.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.30 no.3
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• pp.423-427
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• 1997

The effect of different treatments on the quality and yield of purified agar produced from Gelidium amansii has been studied, and the extraction condition ol agar produced from G. amansii has been examined. The contents of ash, sulfate in agar produced from g. amansii collected from different places were $2.63\~2.92\%\;and\;1.38\~1.78\%$, respectively. Yields and gel strength of agar produced from G. amansii collected from different places were $31.6\~46.8\%\;and\;496\~887g/cm^2$, respectively. It was effective to extract agar at $120^{\circ}C\;for\;2\~3hrs$. Agar was purified by D.W. washing, EDTA washing, chitosan treatment, CPC treatment, PEG treatment, ethanol precipitation, acetone precipitation and propanol precipitation. The mineral contents of agar produced from Gelidium amansii were Na (2934ppm), Ca (2472ppm), Mg (2259ppm), K (2527ppm), P1(81.1ppm), Fe (66.4ppm), Al (71.7ppm), Zn (29.7ppm) and Pb (ND: not detected), respectively.

• Applied Biological Chemistry
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• v.32 no.3
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• pp.240-248
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• 1989

The effects of the soil properties on the contents of catalpol, sugar and ash in the rhizoma of Ji-whang (Rehmannia glutinosa Lib. var. purpurea Makino) were studied to get information on cultivation for higher quality production. Catalpol contents of the rhizoma of Ji-whang ranged from 3.75 to 4.36%. It was shown that the sand contents of soil was positively correlated with the catalpol contents, and negatively correlated with the contents of fructose and galactose in the rhizoma of Ji-whang. The sand contents of subsoil was also negatively correlated with the contents of ash and acid insoluble ash in rhizoma. The clay contents of subsoil was negatively correlated with the catalpol contents, and positively correlated with the contents of fructose, galactose and sucrose in rhizoma, respectively. The clay contents of soil was positively correlated with the ash contents, and negatively correlated with the contents of ethanol extract and water extract in rhizoma, respectively. The organic matter contents of surface soil and subsoil were negatively correlated with the contents of catalpol and extracts (ethanol and water), and positively correlated with the contents of fructose and ash in rhizoma. The total nitrogen contents of surface soil was negatively correlated with the catalpol contents, and positively correlated with the contents of fructose and sucrose in rhizoma. The potassium contents of soil was highly positively correlated with the fructose contents in rhizoma.

• The Hankook-Saengyark Bo
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• no.226
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• pp.2-2
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• 1998

야생화 종자시장 급속확대(조경용등 관심높아져 업체 속속 진출) - 회분함량 $25\~35\%$는 '녹용 중품' - 수입녹용 검사기관 변경

• Korean Deer Journal
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• v.2 no.5 s.10
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• pp.46-50
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• 1997

• Korean Deer Journal
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• v.5 no.2 s.25
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• pp.71-71
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• 2000

• Korean Deer Journal
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• v.3 no.4 s.15
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• pp.39-41
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• 1998

• Korean Deer Journal
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• v.4 no.4 s.21
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• pp.90-92
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• 1999

• Transactions of the Korean Society of Mechanical Engineers B
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• v.38 no.12
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• pp.963-969
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• 2014

Four coal sources that had different ash contents were evaluated in a drop tube furnace (DTF). Combustion experiments were conducted by using several sources with different particle sizes and excess air ratios under air-staging conditions to determine the optimized combustion conditions of high-ash coal, with an emphasis on the combustion efficiency and NOx emissions. The results show that the higher ash content results in a large amount of carbon remaining unburned, and that this effect is dominant when the largest particle size is used. Furthermore, the ash content of coal does affect the Char-NOx concentration, which decreases with the particle size. The results of this study suggest that an air-staged system can be useful to reduce the NOx emissions of high-ash coal and that control of the air stoichiometric ratio of the primary combustion zone (SR1) is effective for reducing NOx emissions, especially by considering unburned carbon contents.