http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
齒科用 닉켈-크롬合金의 引張强度와 微細組織에 관한 硏究
林時德,玄鍾九 대구산업정보대학 1987 논문집 Vol.1 No.-
In this study The auther set casting mold degree on 500℃ 700℃ 900℃ and carried out centrifugal casting about Ticonium premium 100 which is Ni-Cr alloy and widely used as dental non-precions alloy. The outhor measured tensile strength and abserved fine structure by microscope and obtained following conclasions: 1. The tensile strength was 457.9±21.7 /kg/mm2 in 500℃ casting mold degree. 412.3+19.6kg/㎟ in 700℃ casting mold degree and 398.3±26.5kg/x-㎟ in 900℃casting mold degree. The tensile strength was reduced when the casting mold degree increased. 2. In all casting mold degree resinous structure-the typical casting structure-was formed and fine air bubble casting defect was appeared. 3. When casting mold temperature increased resinous crstal was appeard coarsely and largely.
短時間鑄造法에 의한 非貴金屬合金鑄造體의 適合精度와 金屬組織에 關한 硏究
林時德,金在道 대구산업정보대학 1989 논문집 Vol.3 No.-
The purpose of this study was to investigate the fitness accuracy and microstructure of Ni-Cr dental alloy castings by quick heat-up procedures. Fitness between metal mould and castings was measured by ready made metal mould in upper dia. 9㎜., lower dia. 10㎜, height 10㎜. Microstructure was observed by metallurgical microscope after etched acid solutions. The results were as follows: 1. The fitness accuracy of normal procedures was 9~31㎛, and the average was 20㎛. 2. The fitness accuracy of quick heat-up procedures was 12-34㎛, and the average is 22㎛. 3. The fitness acccuracy of quick heat-up procedures were more than normal procedures, but was similar to it. 4. Microstructure of normal proedures was finer grain size than quick heat-up proedures, and existed in porosities and dendrite structure by both procedures.
14K 및 16K 齒科用 金合金의 硬度 및 微細組織에 關한 硏究
金在道,林時德 대구산업정보대학 1989 논문집 Vol.3 No.-
The purpose of this study was to investigate the variation of micro-vickers hardness and microstructure of dental casting gold alloys manufactured by Korean D Co. Hardness number was measured by micro-vickers hardness tester and microstructure was observed by metallurgical microscope. The results were as follows: 1. Hardness number of experimental group I was 183.62±12.65Hv, hardness number of experimental group Ⅱ was 161,29±9.37Hv, respectively. 2. Hardness number of experimental group I was more approximately 14% than experimental group Ⅱ and both groups were higher hardness number than type Ⅳ gold alloys of K. D. A. specification No. 5. 3. Microstructure of experimental group I was finer structure than experimental group Ⅱ and both groups were existed by dendritic structure and micro porosity.
김경수,정시전 건국대학교 1991 學術誌 Vol.35 No.2
Detection of renovascular hypertension among hypertensive patients is important because it is rare but correctable disease without antihypertensive drupes. The cause of renovascular hypertension is different according to racial differences and percutaneous transluminal angioplasty become most erective and convenient treatment modality at now. We report 2 cases of renovasular hypertension. First case is unusual form of renovascular hypertension which showed unilateral renal artery occlusion instead of renal artery stenosis and collateral circulation from lumbar arteries and second case is cured by percutaneous transluminal angioplasty.
Shade guide의 형태가 색상 결정에 미치는 영향
박걸,김동준,이시은,황윤찬,오원만,황인남 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3
This study was conducted in order to assess whether the form of the shade guide affects in deciding the color of the teeth using the shade guide. Eight shade light cured composite resins (Esthet-X, Dentsply, Milford, USA) were used in this study. Shade guides including the model of maxillary central incisors, teeth-form shade guide, doughnut form shade guide, and shade guide with perforated gray shield were prepared with eight shade composite resins and provided the codes randomly. After arranging the models of teeth, 19 dentists working at the clinic of the Dentistry of Chonnam University Hospital and 65 students of college of dentistry, Chonnnam University selected the shade guides corresponding to the color of each tooth on the gray board under the D_(65) standard illuminant. Bl shade showed highest accuracy of about 95% among all shade guides of 3 forms applied to the test and regardless of observer, tooth form shade guide showed the highest accuracy (p < 0.05) , and the doughnut form showed the lowest accuracy (p < 0.05). At the time of deciding on the color of the teeth using the shade guides as a result of above, the forms of the shade guides can affect the accuracy, and it suggests that the development of the diversified forms of shade guides, which may obtain more accurate results, is required. 본 연구에서는 shade guide를 이용하여 치아의 색상을 결정하는데 있어 shade guide의 형태가 미치는 영향을 평가 하기 위해 시행하였다 8가지 서로 다른 색상 code (Al, A2, Bl, B2, B3, C2, C3, D3)를 사용하는 광중합 복합레진 (Esthet-X, Dentsply, USA)을 이용하여 각 색상마다 상악 중절치 모형, 치아형 shade guide, 도넛형 shade guide, 및 회색 shield를 포함하는 shade guide를 제작하고 무작위로 기호를 부여하였다. 제작된 치아 모형을 배열하고 전남 대학교병원 치과 진료처에 근무하는 19명의 수련의와 전남대학교 치과대학 2, 3학년 학생 65명을 대상으로 회색 배경 판과 D_(65) 표준광 하에서 각 치아의 색상과 일치하는 shade guide를 선택하게 하였다. 연구 결과 Bl 색상은 실험에 적용한 3가지 형태의 모든 shade guide에서 약 95%의 가장 높은 정확도를 보였으며 , 색상간 색차가 가장 적은 B2와 C2는 3가지 형태의 모든 shade guide에서 서로 비슷한 정도의 교차 선택율을 보였다. 또한 관찰자에 상관없이 치아 형태의 shade guide는 가장 높은 정확도를 보인 반면 (p < 0.05), 도넛 형태의 shade guide는 가장 낮은 정확도를 보였다 (p <0.05)
Shee Nirmal K.,Lee Chang‐Ju,Kim Hee‐Joon 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.1
We prepared porphyrin metal–organic frameworks with hexacoordinated Sn(IV) porphyrin trans-SnX2(TPyP), where X = Cl, OH; TPyP = 5,10,15,20-tetra (4-pyridyl)porphyrinato dianion, and Cu(II) acetate, namely {[SnCl2(TPyP)][Cu (OAc)2]4}4DMF4H2O (1) and {[Sn(OH)2(TPyP)][Cu(OAc)2]4}xSolv (2). X-ray crystallographic analysis revealed that both materials consisted of the same square-grid two-dimensional (2D) sheet. The small difference in the trans-axial ligand coordinated to the Sn(IV) center creates distinctively different packing structures. As a consequence of the Cl π and Cl Cl interactions between the adjacent layers in 1, squares of stacked 2D layers are well aligned, giving a single type of ordered porous channel. In contrast, adjacent 2D layers in 2 are stacked along the c-axis with an ABAB sequence with an average delamination of 7.05 Å. The coordination network structures of both materials provide large free voids without interpenetration. Gas sorption studies showed that both porous materials exhibit 10 times higher CO2 adsorption than N2 at 273 K.