• Title/Summary/Keyword: content factor

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Shear strength behavior of crude oil contaminated sand-concrete interface

  • Mohammadi, Amirhossein;Ebadi, Taghi;Eslami, Abolfazl
    • Geomechanics and Engineering
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    • v.12 no.2
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    • pp.211-221
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    • 2017
  • A laboratory investigation into crude oil contaminated sand-concrete interface behavior is performed. The interface tests were carried out through a direct shear apparatus. Pure sand and sand-bentonite mixture with different crude oil contents and three concrete surfaces of different textures (smooth, semi-rough, and rough) were examined. The experimental results showed that the concrete surface texture is an effective factor in soil-concrete interface shear strength. The interface shear strength of the rough concrete surface was found higher than smooth and semi-rough concrete surfaces. In addition to the texture, the normal stress and the crude oil content also play important roles in interface shear strength. Moreover, the friction angle decreases with increasing crude oil content due to increase of oil concentration in soil and it increases with increasing interface roughness.

Quality Characteristics of Cookies containing Mulberry Leaf (Morus alba Linne) Powder (뽕잎 분말을 첨가한 쿠키의 품질특성)

  • Park, In-Duck
    • Journal of the Korean Society of Food Culture
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    • v.32 no.6
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    • pp.558-565
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    • 2017
  • This study examined the quality characteristics of cookies prepared with mulberry leaf powder (0, 1, 3, 5, and 7%) substituted for flour. The pH of the cookie dough decreased significantly in response to the addition of all levels of mulberry leaf powder. The spread factor of the cookies also increased significantly with increasing mulberry leaf powder content added to the cookies recipe. In addition, the Hunter's color L and a values decreased significantly with increasing mulberry leaf powder content, whereas the b value increased. According to hardness measurements, the substitution of 1~7% mulberry leaf powder resulted in increased hardness compared to the control. Moreover, the DPPH free radical scavenging activity of the cookies was increased significantly (p<0.05) with increasing levels of mulberry leaf powder. The sensory evaluation revealed cookies containing 3% to have the highest scores.

Remediation of Groundwater Contaminated with Zinc Using Permeable Reactive Barriers Containing Foundry Sands (주물사가 포함된 투수반응벽체(PRB)를 이용한 아연으로 오염된 지하수 처리기법 연구)

  • ;Benson, Craig H
    • Journal of the Korean Geotechnical Society
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    • v.18 no.5
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    • pp.159-167
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    • 2002
  • Partition coefficients for zinc vary on a broad range depending on properties of the foundry sands (TOC, clay content, total iron content) and solution pH. Among these properties, solution pH was found to be the most important factor. Empirical equations were developed from batch tests to predict partition coefscients and rate constants as a function of foundry sand properties and solution pH. Rate constants obtained from batch (kinetic) tests and batch sorption tests were found to be comparable when the solution pHs were comparable.

A Study on the Air Pollution Level in Tae Jon Area by Botanical Indicator (指標植物을 이용한 大氣汚染度 調査硏究 -대전시를 중심으로-)

  • Oh, Sob Yun
    • Journal of Environmental Health Sciences
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    • v.10 no.2
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    • pp.69-77
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    • 1984
  • Air pollution has been one of the severe problems in city area. Sulfur dioxide is the major pollutant among the air pollutants. And the lichen as a botanical indicator have been used to predict the air pollution level. This study was carried out to evaluate the air pollution level in Taejon area through the field survey which were checked lichen status and sulfur dioxide content in the atmosphere. The results were as follows 1. The average sulfur dioxide content in Taejon area was 0.031ppm. The comparison of measurement methods were regression equation, Y= 0.357$\times$+0.014 and correlation factor, r = 0.771. 2. The maximum point of the SO$_2$ level was site No. 2(Daehwa-Dong), 0.087 ppm and the minimum, site No. 8 (Doma 2-Dong), 0.009ppm. 3. Total amounts of sulfur dioxide yearly emitted from Taejon area by fuel consumption estimated 29829.6 tons. 4. The relationship between degree of lichen and sulfur dioxide contents were 0.000~0.020ppm : Zone No. 2 0.020~0.060ppm : Zone No. 1 over 0.060ppm : Zone No. 0

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Growth Simulation of Ilpumbyeo under Korean Environment Using ORYZA2000: II Growth Simulation by New Genetic Coefficients

  • Lee Chung-Kuen;Shin Jae-Hoon;Shin Jin-Chul;Kim Duk-Su;Choi Kyung-Jin
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2004.04a
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    • pp.102-103
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    • 2004
  • [ $\bigcirc$ ] In the growth simulation without changing of module with ORYZA2000, dry matter, LAI and leaf nitrogen content(FNLV) were estimated well under high nitrogen applicated condition, but overestimated under low nitrogen applicated condition. $\bigcirc$ Nitrogen stress factor on the SLA was introduced into ORYZA2000 because especially overestimated LAI under low nitrogen applicated condition was originated from SLA decrease with leaf nitrogen(FNLV) decrease. $\bigcirc$ In the growth simulation with modified SLA modified module, LAI was estimated well under even low nitrogen applicated condition, but dry matter was hardly changed compared with default. $\bigcirc$ Simulated plant nitrogen content and dry matter have no clear difference between modules, but compared with observed values, panicle weight(WSO) and rough rice yield(WRR14) were overestimated under high nitrogen applicated because of lodging, pest, disease and low nitrogen use efficiency.

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Studies on Cure Behaviors, Dielectric Characteristics and Mechanical Properties of DGEBA/Poly(ethylene terephthalate) Blends

  • Park, Soo-Jin
    • Macromolecular Research
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    • v.17 no.8
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    • pp.585-590
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    • 2009
  • The cure behaviors, dielectric characteristics and fracture toughness of diglycidylether of bisphenol-A (DGEBA)/poly(ethylene terephthalate) (PET) blend system were investigated. The degree of conversion for the DGEBA/PET blend system was measured using Fourier transform infrared (FTIR) spectroscopy. The cure kinetics were investigated by measuring the cure activation energies ($E_a$) with dynamic differential scanning calorimetry (DSC). The dielectric characteristic was examined by dielectric analysis (DEA). The mechanical properties were investigated by measuring the critical stress intensity factor ($K_{IC}$), critical strain energy release rate ($G_{IC}$), and impact strength test. As a result, DGEBAIPET was successfully blended. The Ea of the blend system was increased with increasing PET content to a maximum at 10 phr PET. The dielectric constant was decreased with increasing PET content. The mechanical properties of the blend system were also superior to those of the neat DGEBA. These results were attributed to the increased cross-linking density of the blend system, resulting from the interaction between the epoxy group of DGEBA and the carboxyl group of PET.

Study of Physical Characteristics on the Kind, Amount of Sugar and Number of Kneading by Processing Method of Soybean Dasik (콩다식 제조시 당의 종류와 당의 양, 반죽 횟수에 따른 물리적 특성 연구)

  • 박지현;우순임
    • Korean journal of food and cookery science
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    • v.13 no.1
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    • pp.1-6
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    • 1997
  • The purpose of this study was to establish the most favorable processing method for soybean Dasik. Factors were kind of sugar (honey, syrup, oligo sugar), amount of sugar (50 g, 60 g, 70 g) and number of kneading (20 times, 30 times, 40 times). Physical characteristics were measured by moisture content, color difference and texture. Moisture content was increased in order of honey, oligo sugar and syrup. Lightness of soybean Dasik was different with amount of sugar. The tendency of L value and b value were dominent by honey. Lightness, redness and yellowness had no difference with the kind of sugar and number of kneading. Hardness was not a significant factor. Springiness was significantly different by the kind and amount of sugar. Cohesiveness, gumminess and chewiness was influenced by the kind and amount of sugar, the interaction of kind and amount of sugar.

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An Experimental Study on the Accuracy of Concrete Unit-Water Content Using High-frequency Water Fraction Sensors (고주파수분센서를 이용한 콘크리트 단위수량 평가 정확도에 관한 실험적 연구)

  • Youn, Ji-Won;Lee, Seung-Yeop;Yu, Seung-Hwan;Yang, Hyun-Min;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.61-62
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    • 2022
  • The unit quantity is an important factor influencing the durability, workability, and quality of concrete. Methods for measuring the unit quantity include a high frequency heating method, a unit volume mass method, a capacitance method, and a microwave method. However, these methods have disadvantages of poor measurement method, time required, and accuracy, and a relatively experimental method compensating for these disadvantages was used to measure the unit quantity using a high frequency main sensor (FDR) capable of simple and fast measurement. In addition, the unit quantity was evaluated by analyzing the measurement data through deep learning.

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An Experimental Study on the Evaluation of Unit-Water Content Acoording to Concrete Aggregate Variables through FDR Sensor (FDR 센서를 통한 콘크리트 골재 변수에 따른 단위수량 평가에 관한 실험적 연구)

  • Youn, Ji-Won;Yu, Seung-Hwan;Yang, Hyun-Min;Yoon, Jong-Wan;Park, Tae-Joon;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.70-71
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    • 2021
  • The unit quantity that affects the workability, shrinkage cracking, and durability of concrete is an important factor. Methods for measuring the unit quantity include a high frequency heating method, a capacitance method, a unit volume mass method, and a simple method. However, these methods have the disadvantage of poor measurement method, time required, and precision. To solve this problem, a relatively simple and fast measurement method was adopted to compensate for the shortcomings through a Frequency Domain Reflection (FDR) sensor, and the unit quantity was used. In addition, the measurement data was analyzed by deep learning to evaluate the unit quantity of concrete.

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Factors Affecting the Sales of Newspapers and Magazines Based on Concise Catalog

  • Dayou Jiang
    • Journal of Information Processing Systems
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    • v.19 no.4
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    • pp.498-512
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    • 2023
  • The traditional newspaper industry faces the opportunities and challenges of industry transformation and integration with new media. Consequently, the catalogs of newspapers and magazines are also updated. In this study, necessary information on catalogs was obtained and used to analyze the overall development trend of the newspaper industry. A word frequency analysis was then performed on the introduction and product categories of the catalogs, and the content and types of newspapers and magazines were examined. Furthermore, related factors such as price, number of pages, publishing frequency, and best-selling status were analyzed; the correlation among factors affecting best-selling status was also explored. Subsequently, each element and a combination of elements were used to generate a dataset, build three classification models, and analyze the accuracy of predictions of whether newspapers sold well under other circumstances. The experimental results showed that price is the most critical factor affecting the best-selling status of newspapers and magazines. Publishing frequency and the number of pages were also found to be significant indicators that impact people's subscription choices. Finally, a competitive strategy regarding content, price, quality, and positioning was developed.