• 제목/요약/키워드: Major elements

검색결과 1,973건 처리시간 0.027초

A study of the inorganic element contents for the ginsengs of Keumsan, Chungnam

  • 송석환
    • 고려인삼학회:학술대회논문집
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    • 고려인삼학회 2008년도 춘계 학술대회
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    • pp.74-75
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    • 2008
  • This study is for geochemical relationships between ginsengs and soils from three representative soil types from Keumsan, shale, phyllite and granite. For these study, ginsengs, with the field and weathered soils were collected from the three regions, and are analysed for the major and trace elements. In the weathered soils(avg.), the granite and phyllite areas are high in the most of elements while the shale area is low. In the correlation coefficients, negative correlations are shown in the $Al_2O_3$-MgO pair while positive correlations, are shown in the Ba-Sr, Zr, Sr-Zr and Cs-Ge pairs. In the field soils(avg.), the granite and phyllite areas are, generally, high in the most of elements while the shale area is low. In the shale area, the major elements are high in the 4 year soils, but low in the 2 year soils. The LFS(Ba, Sr, Cs) and transitional elements are high in the 2 year soils, but low in the 4 year soils. The HFS(Y, Zr) is high in the 4 year soils. In the correlation coefficients, most of the elements from the 4 year show positive relationships. Positive correlations are shown in the $Al_2O_3$-CaO, MnO-MgO, V-Tl, and Ba-Sr pairs in all localities. In the ginseng contents, clear chemical differences with the ages are shown in the shale and granite ares, but not clear in the phyllite area. In the shale area Mn, Mg, Ba, Sr, and Y contents, increase with ages but decrease in Al, Cs, Be and Cd. In the correlation coefficients, degrees of the correlations for the major elements become low with the ages. Positive correlations are shown in the Al-Mn, Ti, Mn-Ti, Mg-Ca, Ca-K, Ba-Cs, Y and Cs-Y pairs. Comparisons with ginsengs of the same ages from the different areas suggest that generally, the 2 years in the shale and 3 and 4 years in the granite area are distinctive. Relative ratios(granite/ shale area) of the ginsengs are below 1 in the major elements except Mn in the 2 year ginsengs and above 1 in the other elements except Mg and Na in the 4 year. Relative ratios(granite/ phyllite area) of the ginsengs are high in the 3 year from the phyllite area. In the relative ratios(weathered/field soils) of the soils, numbers of the elements showing the ratios of above 1 increase from the shale, to phyllite and granite in the case of the major elements, but decrease in the case of the trace elements. These results suggest that major elements are high in the granite while trace elements are high in the shale area. In the relative ratios between field soils and ginsengs(field soils/ginseng), the shale area, regardless of the ages, show differences of several hundred times in the $Al_2O_3$, $TiO_2$, Y and Tl, of several ten times in the MnO, MgO and Ba and of several times in the CaO contents. These results suggest that ginseng contents are significantly different from the field soils in the $Al_2O_3$, $TiO_2$, Y and Tl, but similar in the CaO contents. The phyllite area, regardless of the ages, show differences of several hundred times in the $Al_2O_3$, $TiO_2$, Y, Tl and Be, of several ten times in the MnO, MgO, $Na_2O$ and Ba, and of several times to ten times in the CaO, $K_2O$ and Sr contents. These results suggest that ginseng contents are significantly different from those of the field soils in the $Al_2O_3$, $TiO_2$, Y, Tl and Be, but similar in the CaO, $K_2O$ and Sr contents. The granite area, regardless of the ages, show differences of several hundred times in the $Al_2O_3$, $TiO_2$, Tl and Be, of several ten times in the Ba, and of several times to ten times in the MgO and CaO contents. Of the other elements, differences of several times to ten times are shown in the MnO, $K_2O$ and Sr contents. These results suggest that ginseng contents are significantly different from those of the field soils in the $Al_2O_3$, $TiO_2$, Tl and Be, but similar in the $K_2O$ and Sr contents. Comparisons among the different ages from the same area suggest that, in the case of shale area, differences of several hundred times in the $Al_2O_3$ and $TiO_2$, of the several ten times in the MnO, MgO and Ba and several times in the CaO and $K_2O$ are shown in the 2 year ginsengs. Differences of several hundred times in the $Al_2O_3$, $TiO_2$, Cs, Y, Tl and Be, of above several ten times in the MnO, MgO, $K_2O$ and Ba, and of several times in the CaO and Sr are shown in the 3 year ginsengs. Differences of several hundred to thousand times in the $Al_2O_3$, of above several hundred times in the $TiO_2$, Cs and Y, and of several ten times in the MnO, MgO, $K_2O$ and Ba, and of several times in the $Na_2O$ are shown in the 4 year ginsengs. These relationships suggest that, regardless of the localities in the shale area, $Al_2O_3$ contents of the soils show big differences from those of the ginsengs. Regardless of the ages of ginsengs, comparisons with the overall average contents of each area show differences of several hundred times in the $Al_2O_3$, $TiO_2$, Cs and Tl and of several ten times in the MnO. These overall relationships suggest that the $Al_2O_3$, $TiO_2$, Cs and Tl contents of the soils are higher than those of the ginsengs, show big differences between two and low different contents are found in the MnO. In detail, differences of several hundred times in the Y, and ten times in the MgO and Sr, and of several times in the CaO, $Na_2O$, $K_2O$ in the case of shale area, are shown. These results suggest that the soils are higher than the ginsengs in the Y and significantly differences in Y, and moderately differences in the MgO and Sr, and low differences in the CaO, $Na_2O$ and $K_2O$ are shown between soils and ginsengs.

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웹 정보자원의 색인과 초록 요소에 관한 연구 (A Study on the Elements of Indexing and Abstracting on the World Wide Web)

  • 최재황
    • 한국문헌정보학회지
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    • 제33권1호
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    • pp.113-128
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    • 1999
  • 인쇄물의 색인과 초록은 통제어나 시소러스를 이용하여 합의된 방식으로 작성되지만, 웹 정보자원의 색인과 초록은 인간의 작업을 거치지 않고 자동으로 작성된다. 웹 환경에서의 색인과 초록은 인쇄물의 색인${\cdot}$초록과 비교하여 어떠한 과정을 거치며, 어떠한 요소들을 포함하는가에 대한 연구는 매우 의미 있는 일이라고 본다. 본 연구에서는 휑 정보자원의 수집, 색인 저장, 검색의 과정을 살펴보았고, 6개의 웹 검색 엔진을 통하여 색인과 초록작성에 영향을 미칠 수 있는 17개의 색인 요소와 11개의 초록 요소 그리고 2개의 메타 요소를 조사하였다. 전반적인 웹 정보자원의 색인과 초록에 대한 경향과 전망에 대해서도 살펴보았다.

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The continuous-discontinuous Galerkin method applied to crack propagation

  • Forti, Tiago L.D.;Forti, Nadia C.S.;Santos, Fabio L.G.;Carnio, Marco A.
    • Computers and Concrete
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    • 제23권4호
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    • pp.235-243
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    • 2019
  • The discontinuous Galerkin method (DGM) has become widely used as it possesses several qualities, such as a natural ability to dealing with discontinuities. DGM has its major success related to fluid mechanics. Its major importance is the ability to deal with discontinuities and still provide high order of approximation. That is an important advantage when simulating cracking propagation. No remeshing is necessary during the propagation, since the crack path follows the interface of elements. However, DGM comes with the drawback of an increased number of degrees of freedom when compared to the classical continuous finite element method. Thus, it seems a natural approach to combine them in the same simulation obtaining the advantages of both methods. This paper proposes the application of the combined continuous-discontinuous Galerkin method (CDGM) to crack propagation. An important engineering problem is the simulation of crack propagation in concrete structures. The problem is characterized by discontinuities that evolve throughout the domain. Crack propagation is simulated using CDGM. Discontinuous elements are placed in regions with discontinuities and continuous elements elsewhere. The cohesive zone model describes the fracture process zone where softening effects are expressed by cohesive zones in the interface of elements. Two numerical examples demonstrate the capacities of CDGM. In the first example, a plain concrete beam is submitted to a three-point bending test. Numerical results are compared to experimental data from the literature. The second example deals with a full-scale ground slab, comparing the CDGM results to numerical and experimental data from the literature.

디자인의 원리에 의거한 레스토랑 프로젝트의 공간구성에 관한 기초연구 (A Basic Study on the Space Organization of Restaurant Projects Based on the Principles of Design)

  • 김용립
    • 한국실내디자인학회논문집
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    • 제21권5호
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    • pp.122-134
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    • 2012
  • The purpose of this study is to comprehend how traditional design theory, 'design elements and principles' have been applied to space design, taking interior designs of restaurants as the subjects of the research. Furthermore, this study intends to provide practical help to the restaurant designers and students who major in interior design, by summarizing the applications case by case. For the analysis, 10 restaurant projects were selected to which 'design elements and principles' were well applied. In order to widen the scope of application cases, this study selected four Korean restaurant projects, and three US and Japan restaurant projects, respectively. Through the analysis, it was found that many unexpected results can be produced when various elements composing a space are combined together, including not only two-dimensional elements such as plane and color, texture, and pattern but also three-dimensional elements and architectural elements composing interior space. Moreover, I became to have confidence that 'design elements and principles' would sustain the value in most design parts including interior design in the future as well.

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추가령 열곡대에 분포하는 전곡현무암의 지화학적 특성 (Geochemical Characteristics of the Quaternary Jungok Basalt in Choogaryong Rift Valley, Mid-Korean Peninsula)

  • 위수민
    • 자원환경지질
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    • 제29권2호
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    • pp.171-182
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    • 1996
  • 제 4기 전곡현무암은 추가령 열곡대내의 한탄강유로를 따라 길게 분포하고 있으며 이대성 외 (1983)에 의하면 대략 10-20 m정도의 두께를 가지고 있다. 전곡현무암의 암석분화 과정을 밝히기 위해 57개의 시료가 채취 되었으며, 이중 16개의 시료에 대한 주성분 및 미량원소의 화학분석이 실시되었다. 분석된 시료들의 화학조성에 의하면 전곡현무암은 알칼리계열의 현무암으로 특징지워지며, MgO를 제외한 주성분원소의 변화범위가 미량원소에 비하여 상당히 좁은 영역을 나타낸다. 분별결정작용 모델을 정량적으로 시험하기 위해서 Multiple linear regression을 사용하였다. 주성분원소와 반정으로 산출되는 광물의 화학조성을 사용하여 계산된 결과는 전곡현무암의 화학조성의 변화는 감람석, 사장석, 휘석, 자철석이 56 : 25 : 17 : 2의 비율로 분별정출되어 분화된 것으로 설명할 수 있다. 그러나 위의 결과를 가지고 미량원소의 함량을 계산하면 불호정 (incompatible) 원소의 계산치는 딸암석의 실제 함량에 미치지 못한다. 이러한 점으로 미루어 전곡현무암의 화학조성의 변화는 광물들의 단순한 분별정출 작용만으로는 설명하기가 어렵다. 따라서 전곡현무암의 화학조성의 변화는 약간 다른 정도의 부분용융에 의해 불호정 원소의 초기치가 다른 것들이 분별정출과정을 겪었거나, 혹은 RTF과정에 의한 불호정원소의 부화가능성을 배제할 수 없음을 시사한다.

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MODIS NDVI와 기상요인을 고려한 마늘·양파 주산단지 단수예측 모형 개발 (Development of Garlic & Onion Yield Prediction Model on Major Cultivation Regions Considering MODIS NDVI and Meteorological Elements)

  • 나상일;박찬원;소규호;박재문;이경도
    • 대한원격탐사학회지
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    • 제33권5_2호
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    • pp.647-659
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    • 2017
  • 마늘과 양파 재배는 작물의 생육 조건과 주산지 기상에 영향을 받는다. 따라서 단수를 예측할 때에는 주산지의 작황과 기상을 고려할 필요가 있다. 본 연구에서는 2006년에서 2015년까지의 작물의 생육 조건을 반영한 MODIS NDVI와 7개 주산지의 기상요인을 다중 회귀 모형에 적용하여 주산지별 마늘 및 양파의 단수예측 모형을 개발하였다. 다중 회귀 모형에서 독립변수 채택은 단계적 선택방법을 이용하였다. 그 결과, 마늘과 양파 단수예측 모형은 2월의 MODIS NDVI가 중요한 독립변수로 채택되었다. 기상요인은 마늘의 경우, 평균온도(3월), 강우량(11월, 3월), 상대습도(4월), 최저온도(6월)가 채택되었으며, 양파는 강우량(11월), 일조시간(1월), 상대습도(4월), 최저온도(6월)가 독립변수로 채택되었다. MODIS NDVI와 기상요인을 이용한 단수예측 모형은 주산지별 마늘, 양파 평균 단수의 84.4%, 75.9% 설명력을 나타내었으며, RMSE는 각각 42.57 kg/10a, 340.29 kg/10a로 나타났다. 따라서 본 모형은 MODIS NDVI와 기상요인에 따른 마늘과 양파의 단수 변화특성을 잘 반영하고 있는 것으로 판단된다.

신안침몰선 인양 중국 동전의 화학조성 (CHEMICAL COMPOS IT80N OF AHCIENT CH INESE COINS RICOVIRID FROM THI SHINAN SHIPWRECK)

  • 이창근;강대일
    • 보존과학연구
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    • 통권10호
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    • pp.1-40
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    • 1989
  • Between 1976 and 1984 approximately 26.7 tons of Chinese coins were recovered from a shipwreck which was found at the seabed of the Shin an area in the south-western coast of the Korean peninsula. Elements, Cu, Pb, Sn, Fe, Sb, As, Zn, Ag, Ni, Co and Mn, of 54 pieces of the coins were determined by Inductively Coupled Plasma Atomic Emission Spectroscopy(ICP-AIS). The result shows that Ch, Pb, and Sn were found to be major elements roughly the coins with the ratio of 7 : 2 : 1, respectively. Trace elements were classified into 3 levels according to the avarage concentration : Fe,As and Sb(0.1-0.5%), Ag, Mi, Co and Zn(100-1000ppm) and Mn(10ppm). Some systematic tendencies are observed in the composition change with a function of their minting ages .The Wuzhu coins(오수전) from the Eastern Han dynasty(A.D.25-219 )are much more abundant in Cu than the coins of Tang dynasty(A.D.618-907) and later periods. Major element compositions of the Kai -tong Vuan-Bao(개통원보) coins from the Tang dynasty, were remarkably variable. In general, however, the Tang dynasty coins were much more abundant in Cu than the Song dynasty(A.S.S60-1279) coins. The amount of major elements Cu and Sn decreases while that of Pb in creasesby passage of age from the Bei Song dynasty(A.D.960-1127) to later Nam Song dynasty (A.D.1127-1279 ). It means that the quality of coins mere degraded. The amounts of trace elemends(Fe, As, Co, Hn) increases with the above age. High amounts of trace elements are supposed to be a reflection of immaturity of minting techniques or use of impurity-rich raw materials. The Jin dynasty(A.D.1125-1234) coins are found to be rich in Sn and thus contain Pb as the third component. It is quite different from the coins of the Song dynasty. The Zhi-dai Tong-Bao(지대통보) coins of the Yuan dynasty from A.0.1310 are much more abundant in Cu and Sn than those of the Nam Song dynasty .

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A proton induced X-ray emission (PIXE) analysis of concentration of major/trace and toxic elements in broiler gizzard and flesh of Tehsil Gujar Khan area in Pakistan

  • Nadeem, Khawar;Hussain, Javaid;Haq, Noaman Ul;Haq, A. Ul;Akram, Waheed;Ahmad, Ishaq
    • Nuclear Engineering and Technology
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    • 제51권8호
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    • pp.2042-2049
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    • 2019
  • Ten gizzard and three flesh samples of the broiler were collected from different locations in Tehsil Gujar Khan District Rawalpindi, Pakistan. The samples were dried, crushed and ground. Pellets were prepared by pressing the powder of the samples and that of the Bovine liver 1577c reference material obtained from NIST, USA. Proton induced X-ray emission (PIXE) installed at National Center for Physics, Islamabad, Pakistan has been used as a reliable and improved technique to determine concentration of various major/trace and toxic elements e.g. S, Cl, K, Ca, Cl, Fe, Cu, Mn, Co, Zn, Ti, Cd, Ga, Cr, V and Ni, in the Gizzard and Flesh samples of the broiler. The concentrations of all the detected elements in the samples are statistically significant. The certified and measured values of the elements in the reference material were in agreement with each other within a deviation of 7%. S, Cl, K and Ca are within tolerable limits and are good for human consumption. Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn were more than the acceptable limits of World Health Organization, WHO whereas Ga, As, Sn, Sb and Pb are not detected in most of the samples.

황등화강암(黃登花崗岩)의 풍화(風化)에 따른 화학조성(化學組成)의 변화(變化)와 주요원소(主要元素)의 상대적(相對的) 이동(移動) (Variation of Chemical Composition and Relative Movement of Major Elements on the Weathering of Hwang-Dung Granite)

  • 남기상
    • 자원환경지질
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    • 제6권2호
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    • pp.115-122
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    • 1973
  • The writer intended to observe the relative mobility of elements in weathering process of granite, on the outskirts of IRI city at Jeollabukdo KOREA. He analysed fresh granites and weathered ones of Hwang-Dung granite mass and had following conclusions by the triangular diagrams and the oxidized variation diagrams of the analysis. 1) The increasing phenomena of $H_2O$ observed clearly in early and late stage of weathering processes. 2) Granites was weathered by physical weathering in early stage, and it was weathered by chemical weathering in late stage. 3) The ratio of $FeO/Fe_2O_3$, FeO/MgO, and $SiO_2/Al_2O_3$ decreased uniformly from early to late stage of weathering processes. 4) It was proved that weathering potential of granite was larger than that of basaltic rock. 5) The order of mobility in major elements was Ca, Na, K>Si>Mg>Fe, Al.

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공공환경에서 효과적인 길찾기를 위한 디자인 가이드라인에 관한 연구 (A Study on the Design Guidelines about Physical Elements for Effective Wayfinding in Public Spaces)

  • 박몽섭;박혜경
    • 한국실내디자인학회:학술대회논문집
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    • 한국실내디자인학회 2004년도 추계학술발표대회 논문집
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    • pp.76-79
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    • 2004
  • The purpose of this study is to suggest the specific design guidelines for major physical elements like colors, patterns or shapes which can produce the place identity enhancing wayfinding affordability. The research consists with theoretical studies. From the precedent researches, the main design principles enhancing wayfinding affordability were defined and then the list and the nature of the major physical interior elements were drawn, based on them. The result presented that the specific design guidelines as well as design principles could be focused on the categories like generating landmarks, introducing color codes, floor patterns, and wall decorating. And dealing them to promote place identity, were shown as useful in articulating the pathway and indicating spatial orientation. Design guidelines as the result of the research, could be easily and directly applied on the real public spaces as a visual guidance enhancing navigability(the ability to recover position and orientation) to make up the wayfinding weakness.

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