• 한국초지조사료학회지
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• 제23권4호
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• pp.229-236
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• 2003

orchardgrass 및 white clover의 단파 및 혼파 재배조건에서 미량요소 Fe, Mn, Cu, Zn, Mo 및 B의 조합시비별 목초의 생육, 개화, 수량, 양분 함량 및 초종간 경합지수 등에 미치는 영향 등을 구명하였다. 다량요소 양분을 동일량 시비한 조건에서 7 수준의 미량요소 조합시비는 T$_1$; 대조구, T$_2$; Fe, T$_3$; Fe+Mn, T$_4$； Fe＋Mn＋Cu, T$_{5}$; Fe+Mn+Cu＋Zn, T$_{6}$；Fe+Mn+Cu＋Zn+Mo 및 T$_{7}$； Fe+Mn+Cu+Zn+Mo+B로 하였다. 본 I집에서는 각 조합시비별 목초의 생육, 개화 및 수분생리/하고현상 특성 등에 미치는 영향을 검토하였다. 1, orchardgrass는 T$_3$와 T$_{6}$ 에서 심한 Fe-결핍 황화현상을 보였고, 이는 T$_4$와 T$_{5}$ 에서는 크게 경감되었다. 반면에 T$_1$, T$_2$및 T$_{7}$ 조합시비에서는 황화현상이 없이 정상적인 생육을 보였고, 특히 T$_{7}$완전 조합시비에서는 단파 및 혼파재배 공히 다른 조합시비에 비해서 가장 양호한 생육을 보였다. white clover는 조합시비별 황화현상은 보이지 않았으나 단파재배에서 T$_1$, T$_2$및 T$_{7}$에서는 다른 조합시비에 비해서 더 진한 녹색과 더 양호한 생육을 보였다. 2. 여름 고온기에 orchardgrass는 하고현강을 보였으나 T$_1$과 T$_{7}$에서는 다른 처리구보다 상대적으로 크게 경감 되였다. 황화현상을 보인 조합시비에서는 약한 줄기와 고온으로 인하여 일부 도복현상을 보였다. white clover는 하고현상을 보이지 않았고 처리별 수부요구도의 차이는 분명하지 않았다. 3. 단파재배에서 white clover의 개화 및 화아 수는 T$_{7}$ 및 T$_2$에서 가장 많았고 T$_{7}$에서는 다른 조합시비에 비해서 더 긴 개화기간과 더빠른 만개를 보였다. 이에 비해서 T$_{5}$ 및 T$_{6}$에서는 대조구인 T$_1$보다 적었고 처리 중 가장 적은 개화수를 보였다. T$_{7}$에서 만이 단파 및 혼파재배 공히 개화 수가 화하 수보다 많은 개화 수/화아 수의 비율이 ＞1 이였다(혼파의 T$_{6}$ 예외). 4. Fe-결핍 황화현상은 항시 부적합한 Fe/Mn과 Fe/Mo 비율에 기인되지 않고, 양이온간(Fe, Mn, Cu, Zn), 음이온간(Mo, B), 그리고 이들의 총 농도의 부조화에도 기인된다는 것을 인지할 수 있었다. 그리고 Fe${\times}$Mn${\times}$Mo${\times}$B 간 다량 교호작용이 있으며 이 때 B의 조정자 역할이 큰 것으로 보였다.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.23-24
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• 2006

Magnetic and magneto-optical properties of regioregular (>99%) poly(3-dodecylthiopenes are investigated. Faraday rotation of spin-coated films show extremely large Verdet constants, falling strongly with decreasing regioregularity. EPR spectroscopy at room temperature shows the presence of about 1 spin/190 monomers, indicative of delocalisation beyond a single polymer chain. SQUID measurements on the polymer give an effective magnetic moment of about 48900 mB, corrsponding to a S-value of 25.000. The Weiss-constant is 1.33 K indicating ferromagnetic coupling. Our experimental results show that organic polymer magnets can be prepared. Large MO effects allow the use of these materials in all-organic MO-sensors and devices.

• 한국전기전자재료학회논문지
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• 제20권5호
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• pp.399-402
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• 2007

The effects of heat treatment on the electrical properties of strained-Si/SiGe-on-insulator (SGOI) devices were examined. We proposed the optimized heat treatment processes for improving the back interfacial electrical properties in SGOI-MOSFET. By applying the additional pre-RTA (rapid thermal annealing) before gate oxidation step and the post-RTA after source/drain dopant activation step, the electrical properties of strained-Si channel on $Si_{1-x}Ge_x$ layer were greatly improved, which resulting the improvement of the driving current, transconductance, and leakage current of SGOI-MOSFET.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.7-8
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• 2006

The effects of heat treatment on the electrical properties of SGOI were examined. We proposed the optimized heat treatments for improving the interfacial electrical properties in SGOI-MOSFET. By applying the additional pre-RTA(rapid thermal annealing) before gate oxidation and post-RTA after dopant activation, the driving current, the transconductance, and the leakage current were improved significantly.

• Corrosion Science and Technology
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• 제5권1호
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• pp.1-4
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• 2006

Martensitic stainless steel is used when mechanical properties such as high tensile strength and hardness are required. Medium carbon-contained martensitic stainless steel which contains more than 0.2 wt% of carbon should be heat-treated and quenched at the temperature where undissolved carbides are totally dissolved into the matrix. In particular, the dissolution and reprecipitation behaviors of various forms of carbides are affected by such parameters as heating rate, heating temperature, duration time and cooling rate. This study is to investigate the effects of heat treatment parameters of 14Cr-3Mo martensitic stainless on corrosion resistance and phase transformation in relation to the dissolution and reprecipitation of carbides.

• 열처리공학회지
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• 제11권2호
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• pp.121-130
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• 1998

The effects of alloying elements(Mo, Cu, Ni) and austempering temperature conditions on the microstructural morphologies and mechanical properties in austempered ductile cast iron has been investigated. The austempering at $350^{\circ}C$ for 2hrs after austenitizing at $900^{\circ}C$ for 2hrs in all specimens with various alloying elements was optimum because the good combination of tensile and yield strength, hardness and impact value was obtained. The microstructures of these ADIs treated by a forementioned austempering condition are nearly a mixture type of needle and feathery bainite. Among those alloys, Mo-Cu alloyed DCI had the best optimum mechanical properties of hardness and toughness for automobile parts by austempering treatment for 2hrs at $900^{\circ}C$ followed by $350^{\circ}C$ for 2hrs.

• Bulletin of the Korean Chemical Society
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• 제24권6호
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• pp.832-836
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• 2003

To extend the knowledge of triple bonding between group 6 transition metal and heavier group 14 elements, the structural and bonding aspects of ($η^5-C_5H_5$)$(CO)_2$M≡ER (M = Cr, Mo, W; E = Si, Ge, Sn, Pb) are investigated by hybrid density functional calculations at the B3PW91 level. Substituent effects are also investigated with R = H, Me, $SiH_3$, Ph, $C_6H_3-2,6-Ph_2$, $C_6H_3-2,6-(C_6H_2-2,4,6-Me_3)_2$, and $C_6H_3-2,6-(C_6H_2-2,4,6- iPr_3)_2$.

• 대한화학회지
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• 제22권4호
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• pp.195-201
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• 1978

니코틴과 그 양성자 부가물의 배치 및 형태를 분자궤도론으로 EHT와 CNDO/2방법을 써서 연구하였다. 가장 안정한 형태는 피롤리딘 고리가 $280^{\circ}$회전된 꼴임을 알았으며 이것을 콘쥬게이션, 정전기적 및 입체효과로서 설명하였다. 양성자의 부가는 피리딘 고리에 일어나며 일종의 ${\pi}$-착물이 형성됨을 알았다.

• Corrosion Science and Technology
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• 제6권2호
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• pp.56-61
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• 2007

Carbide dissolution during heating processes can change chemical composition of martensitic stainless steel in its austenitic phase. Although the austenitizing treatments were carried out at a homogeneous austenite region, the amount of carbon atom in the matrix differs. Increase in the amount of carbon contents in the matrix resulted in decreasing MS temperature, which consequently causes the volume fraction of the retained austenite to increase. This study reveals the effects of the austenitizing treatment on the properties of Fe - 0.3C - 14Cr - 3Mo martensitic stainless steel change with different austenitizing temperatures.

• 한국세라믹학회지
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• 제22권6호
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• pp.58-70
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• 1985

The bond strength of metal to ceramic sealing in Mo-Mn metallizing was investigated by examining the effects of flux composition in alumina ceramics particle size of molybdenum metal powder wet hydrogen atmosphere and temperature in metallizing. The maximum bond strength was obtained when the glass phase filled almost all the microstructural cavities around the interfacial area with few micropores. Such a favorable microstrcutre waas formed and maximum bond strength was observed between 130$0^{\circ}C$. Also the metal to ceramic bond strength was increased using finer molybdenum metal powder than coarse powder. When content of $SiO_2$ in the flux of alumina ceramics was constant metal to ceramic bond strength was improved with increasing the ratio of CaO to MgO in the flux.