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Cylinder shape filter media consisted at copper manganese oxide catalyst was prepared using pellet extruder, and their CO removal efficiency was investigated. In order to fabricate porous filter media, coppermanganese oxide powder prepared by a redox-precipitation method was mixed with inorganic filler such as porous silica and binder like colloidal silica. Then the mixture was extruded through dice with pinhole diameter of 3.0 mm, followed by drying and heating at 200~600°C. A typical pellet-type filter media exhibited specific surface area (SBET = 560 m2/g), pore volume (Vtot = 0.89 mL/g), apparent density (0.7 g/cm3), and showed excellent CO removal activity at room temperature.
Mesoporous composite materials of one dimensional particles and two-dimensional nano-sheets have been prepared successfully by a simple coagulation-precipitation method. Ferromagnetic magnetite, spinel-type crystalline copper chromite, and amorphous copper manganate was used as one dimensional particles. While the synthetic hectorite particle was used as two-dimensional nano-sheet. In a typical process metal oxide particles were thoroughly dispersed in aqueous solution and then the pre-swelled silicate dispersion was added to the particle suspension under vigorous stirring, followed by adjusting the pH of mixed suspension to 2~3 using acetic acid, resulted in a highly viscous gel-like product. The gel-like product was precipitated by centrifuging, washed with the mixed solvent of distilled water and acetone, then dried at 120°C for 2h. Thus prepared composite powders exhibited dramatically enhanced specific surface area and pore volume.
Levofloxacin, a fluoroquinolone and L-isomer of the racemate ofloxacin, has been approved for the treatment of acute and chronic bacterial infections. Gastrointestinal complaints are the most frequently reported adverse drug reactions to fluoroquinolones. Other adverse events include headache,dizziness, increased liver enzyme levels, photosensitivity, tachycardia, QT prolongation, and eruptions. Anaphylaxis has been documented as a rareadverse drug reaction to levofloxacin; however, diagnostic tests are needed to evaluate whether these reactions are the result of levofloxacin treatment. While the results of skin tests are considered unreliable due to false-positive responses, the oral provocation test is currently considered to bethe most reliable test. Tryptase, a neutral protease, is the dominant protein component of secretory granules in human mast cells, and an increasedserum concentration of tryptase is a highly sensitive indicator of anaphylaxis. Herein, we report a case of levofloxacin-induced anaphylaxis in whichthe patient exhibited elevated serum tryptase levels and a positive oral levofloxacin challenge test result. As anaphylaxis is potentially life-threatening,the administration of fluoroquinolones to patients who have experienced a prior reaction to this type of agent should be avoided.
The purpose of this study is to investigate how the local streams investigation program affects elementary students’ environmental literacy. The study was carried out a group of 9 students who participated in the environmental clubs. The program was organized according to four subtopics and consisted of a total of 20 lessons. Environmental literacy was operationalized in terms of environmental knowledge, environmental emotion, environmental function, and environmental behavior, and the change of students was observed after the completion of the program. The results of the study are as follows. The local streams exploration program positively affected the students’ environmental literacy. The students formed environmental knowledge by identifying and exploring environmental problems around the stream. Environmental emotions have shown the most significant changes and have influenced other environmental literacy factors. Environmental function was difficult for elementary students, and it took time to acquire the function, and relatively little change was observed. Changes in environmental behavior have occurred over long-term and continuous observations rather than in specific activities. 이 연구는 질적 연구방법으로 지역 하천 탐구 프로그램이 초등학생들의 환경소양 변화에 미치는 영향을 알아보는 데 목적이 있다. 연구는 지역 하천인 방촌천 탐구를 주제로 환경동아리를 조직하여 9명의 학생을 대상으로 질적 연구로 수행하였다. 프로그램은 4개의 소주제로 나누고 총 20차시로 구성하였다. 환경소양은 환경지식, 환경정서, 환경기능, 환경행동으로 나누어 프로그램 적용 후 학생들의 변화를 관찰하였다. 연구결과는 다음과 같다. 지역 하천 탐구 프로그램은 학생들의 환경소양 향상에 긍정적인 영향을 주었다. 환경지식은 학생들이 자연환경의 중요성을 깨닫고 자연과 인간의 상호작용에 따른 환경 문제를 인식하며 형성할 수 있었다. 환경정서는 환경감수성이 향상되고 긍정적인 환경태도가 형성되는 등 가장 두드러진 변화를 보였으며 발달한 환경정서는 다른 환경소양 요소에도 영향을 주었다. 환경기능의 경우 초등학생에게 어렵고 기능습득에 시간이 걸려 상대적으로 적은 변화를 관찰하였다. 환경행동은 특정 활동에서 나타나는 변화보다는 장기적이고 지속적인 관찰로 변화가 일어났다. 본 연구의 결과로 지역 하천 탐구 프로그램은 초등학생들의 환경소양 변화에 긍정적인 영향을 미친다는 것을 확인하였다. 따라서 환경교육 내실화를 위해 지역 하천 탐구 프로그램을 통한 창의적 체험활동 동아리 운영 방안을 지속해서 연구해야 할 것이다.
Type I (distal) renal tubular acidosis (RTA) is a disorder associated with the failure to excrete hydrogen ions from the distal renal tubule. It is characterized by hyperchloremic metabolic acidosis, an abnormal increase in urine pH, reduced urinary excretion of ammonium and bicarbonate ions, and mild deterioration in renal function. Hypercalciuria is common in distal RTA because of bone resorption, which increases as a buffer against metabolic acidosis. This can result in intractable rickets. We describe a case of distal RTA with nephrocalcinosis during follow-up of rickets in a patient who presented with clinical manifestations of short stature, failure to thrive, recurrent vomiting, dehydration, and irritability.
Nanoporous composite of copper-manganese oxide particles and two dimensional graphene sheets was successfully prepared by redox-precipitation process of Cu-Mn salts in the presence of delaminated graphene particles. According to the nitrogen adsorption-desorption isotherm analysis. The resulting composite powders exhibited very large specific surface area (~ 520 ㎡/g) and pore volume (~0.85 ㎤/g). The gas removal efficiency of the porous composite was evaluated using CO as a model gas and it could be found that the graphene supported oxide catalyst showed excellent CO removal activity at room temperature.
Nano-sized oxide catalyst was coated on silicon carbide (SiC) surface and gas removal activity was compared using CO and NH3 molecules. In order to prepare coating solution nano-sized oxide (Cu-Mn oxide) particles was prepared firstly by wet-chemical process (redox precipitation), followed by homogeneous dispersion in the various dispersion media such as cellosolves, ketones, colloid silica, etc. Then the catalyst loading was carried out by dipping/spraying the coating solution onto the surface of porous SiC honeycomb. The physico-chemical properties and gas removal activity of the catalyst-loaded SiC honeycomb were discussed in detail.
The cylindrical-type porous pellets of copper-manganese oxide mixed with light-weight inorganic fillers were prepared by extrusion method and the gas removal activity depending on the various process variables was systematically compared. In addition, the mechanical properties including pellet hardness, density, and physical properties such as porosity, surface area, etc, were also investigated. It was found that the newly prepared oxide catalyst-loaded pellet type granules exhibited excellent mechanical and physico-chemical properties; high pellet hardness(>4.0 kg/㎠), very low apparent density (<0.7 g/㎤), large pore volume (>1.0 ㎤/g) and specific surface area (>500 ㎡/g), respectively. Furthermore they showed excellent CO removal activity at room temperature.