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T. DAVID WAITE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.5
Dithionite can be used to reduce Fe(II) and produce nanoscale zero-valent iron (nZVI) under conditions of high pH and in the absence of oxygen. The nZVI is coprecipitated with a sulfite hydrate in a thin platelet. The nanoparticles formed are not pure iron but this feature does not appear to affect their degradation performance under air or N2 gas conditions. The efficiency of trichloroethylene (TCE) degradation, when one is employing nanoparticles manufactured using dithionite (nZVIS2O4), is similar to if not slightly better than that of the more conventional borohydride procedure (nZVIBH4). The other advantages of the dithionite method are that (i) it uses a less expensive and widely available reducing agent, and (ii) there is no production of potentially explosive hydrogen gas. Oxidation of benzoic acid using the nZVIS2O4 particles results in different byproducts than those produced when nZVIBH4 particles are used. The low oxidant yield based on hydroxybenzoic acid generation is offset by the production of higher concentrations of phenol. The high concentration of phenol compared to hydroxybenzoic acids suggests that OH• addition is not the primary oxidation pathway when one is using the nZVIS2O4 particles. It is proposed that sulfate radicals () are produced as a result of hydroxyl radical attack on the sulfite matrix surrounding the nZVIS2O4 particles, with these radicals oxidizing benzoic acid via electron transfer reactions rather than addition reactions.
Adhesion of mussel foot proteins to different substrate surfaces
Lu, Qingye,Danner, Eric,Waite, J. Herbert,Israelachvili, Jacob N.,Zeng, Hongbo,Hwang, Dong Soo The Royal Society 2013 Journal of the Royal Society, Interface Vol.10 No.79
<P> Mussel foot proteins (mfps) have been investigated as a source of inspiration for the design of underwater coatings and adhesives. Recent analysis of various mfps by a surface forces apparatus (SFA) revealed that mfp-1 functions as a coating, whereas mfp-3 and mfp-5 resemble adhesive primers on mica surfaces. To further refine and elaborate the surface properties of mfps, the force-distance profiles of the interactions between thin mfp (i.e. mfp-1, mfp-3 or mfp-5) films and four different surface chemistries, namely mica, silicon dioxide, polymethylmethacrylate and polystyrene, were measured by an SFA. The results indicate that the adhesion was exquisitely dependent on the mfp tested, the substrate surface chemistry and the contact time. Such studies are essential for understanding the adhesive versatility of mfps and related/similar adhesion proteins, and for translating this versatility into a new generation of coatings and (including <I>in vivo</I> ) adhesive materials. </P>
폐쇄성 수면 무호흡 환자의 상하악 전방이동술 전후의 두부계측방사선 사진에서 산출한 기도직경, 상기도 공간의 기류저항과 호흡방해지수 변화와의 연관성
박광호,Park, Kwang-Ho,Waite, Peter D. 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.2
The purpose of this study cephalometrically evaluated changes in the posterior airway space for patients with obstructive sleep apnea syndrome(OSAS) before and after surgical advancement of the maxilla and mandible. The change in calculated airway resistance was correlated with the respiratory disturbance index(RDI). Twenty cephalometric radiographs were traced before and after surgery to determine the posterior airway area and calculate resistance. Polysomnograms of each patient were obtained before and after surgery. All patients had a decrease in calculated airflow resistance in the airway. The mean amount of resistance was 865.15 before surgery, decreasing to 192.65 after surgery (p<0.01). Eighty-five percent of the patients experienced improvement in their RDI. Reduction in the RDI appears to be due to an increase in the posterior airway space and decrease in flow resistance.
Logue Mary Ellim,Robie Melissa,Brown Margo,Waite Katelyn 대한어린이교육협회 2009 어린이교육 Vol.- No.11
교사 케이트: “헨리, 와서 쓰기책상에 있는 새 도장들과 마커들을 봐. 우리 함께 이야기를 써 보자” 헨리: “저 못해요”(달아나며) “나쁜 놈들이 쳐들어온다. 성을 만들어야 해.” 이것은 프리스쿨 교사와 4세 아이 사이의 상당히 전형적인 대화로 많은 프리스쿨 교사들의 걱정거리를 조명해 준다: 활동적인 아이들의 쓰기기술이 발전하도록 교사가 어떻게 교육할 것인가? 많은 연구들은 아이들이 나중에 학교생활의 성공을 위해 초기 읽고 쓰기 활동이 중요함을 지적한다(Dickinson, 2002; Hart & Risley, 1995; Snow, Burns, & Griffin, 1998; Whitehurst & Lonigan, 1998). 초기 읽고 쓰기의 중요성을 뒷받침하는 증거들이 증가함에도 불구하고, 읽고 쓰는 경험이 영아에게 최고의 학문적·사회적 결과물을 만들어 낸다는 주장에 대한 반대의견이 있다. 만일 의도적으로 언어가 풍부한 환경을 만들고 아이들이 연구하고 상호 교류하며 그리고 자신들만의 지식을 쌓을 수 있도록 하게 함으로 학습을 쉽게 해 줄 지도교사를 갖는다면, 아이들이 학교라는 세계와 학업에 있어 더 준비가 잘 될 것이라고 몇몇의 교육가들은 믿는다(Dickinson, 2002; Morrow, 2004). 또 다른 교육가들은 교사의 지시에 의한 명료한 가르침이 없다면 아이들, 특히 저소득 가정 출신의 아이들이 결코 학교생활에 필요한 기술과 지식을 얻을 수 없을 것을 염려한다(Lee & Ginsburg, 2007). 왜냐하면 4세에게 제공되는