• 제목/요약/키워드: In-situ

검색결과 6,097건 처리시간 0.037초

방광 상피내암의 뇨 세포학적 소견 (Carcinoma in Situ of the Urinary Bladder in Bladder Washing Cytology)

  • 정두현;박인애;함의근
    • 대한세포병리학회지
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    • 제2권1호
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    • pp.51-55
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    • 1991
  • The diagnosis of carcinoma in situ of urinary bladder is difficult in that the symptoms and cystoscopic findings are nonspecific. The cytology of urine could be helpful for diagnosis of carcinoma in situ of urinary bladder. We present a case of bladder washing cytology of carcinoma in situ. A 54-year-old man presented with dysuria for 1 year. Cystoscopic findings revealed multifocal reddish trabeculated lesions. The bladder washing cytology revealed rather uniform tumor cells which were singly scattered of forming syncytium in the clean back-ground. The nuclei were round to oval with inconspicious nucleoli. The cystoscopic biopsy revealed typical histologic features of carcinoma in situ of urinary bladder.

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In situ horizontal stress effect on plastic zone around circular underground openings excavated in elastic zones

  • Komurlu, Eren;Kesimal, Ayhan;Hasanpour, Rohala
    • Geomechanics and Engineering
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    • 제8권6호
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    • pp.783-799
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    • 2015
  • In this study, effect of horizontal in situ stress on failure mechanism around underground openings excavated in isotropic, elastic rock zones is investigated. For estimating the plastic zone occurrence, an induced stress influence area approach (Bray Equations) was modified to define critical stress ratio according to the Mohr-Coulomb failure criterion. Results obtained from modified calculations were compared with results of some other analytical solutions for plastic zone thickness estimation and the numerical modelling (finite difference method software, FLAC2D) study. Plastic zone and its geometry around tunnels were analyzed for different in situ stress conditions. The modified equations gave similar results with those obtained from the other approaches. However, safer results were calculated using the modified equations for high in situ stress conditions and excessive ratio of horizontal to vertical in situ stresses. As the outcome of this study, the modified equations are suggested to use for estimating the plastic zone occurrence and its thickness around the tunnels with circular cross-section.

한반도 3차원 지중응력과 이를 고려한 터널해석에 대한 연구 (Korean Three Dimensional In-situ stresses and Tunnel Analysis Considering These Stresses)

  • 김동갑;박종관;김수정
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2001년도 봄 학술발표회 논문집
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    • pp.97-104
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    • 2001
  • The magnitude and the orientation of in-situ stresses contribute to ground displacement and stresses in the field of underground space. This paper investigates in-situ stresses at various depth on the basis of 392 data which were determined by over-coring and hydro-fracturing test methods in the Korea peninsula. The result shows that in-situ stress distribution are more or less non-uniform through the Granite and Gneiss sub-area, and that the K-value in the Volcanic sub-area are below 1 at the deep depth. Also, the result of three dimensional numerical analyses of tunnel shows that the direction and magnitude of displacement around tunnel are much effected by the stress difference between the maximum and the minimum horizontal stress.

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투과전자현미경 내 직접 가열 실험에서의 실험적 문제들 (Practical Issues on In Situ Heating Experiments in Transmission Electron Microscope)

  • 김영민;김진규;김양수;오상호;김윤중
    • Applied Microscopy
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    • 제38권4호
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    • pp.383-386
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    • 2008
  • In performing in situ heating transmission electron microscopy (TEM) for materials characterizations, arising concerns such as specimen drifts and unintentional Cu contamination are discussed. In particular, we analysed the thermal and mechanical characteristics of in situ heating holders to estimate thermal drift phenomena. From the experimental results, we suggest an empirical model to describe the thermal drift behavior so that we can design an effective plan for in situ heating experiment. Practical approaches to minimize several hindrances arisen from the experiment are proposed. We believe that our experimental recommendations will be useful for a microscopist fascinated with the powerful potential of in situ heating TEM.

성토사면에 타설된 현장 콘크리트 말뚝의 강도특성에 미치는 성토재료 및 타설 방법에 대한 영향 (Effect of Strength Properties of In-Situ Concrete Pile in Embankment Slopes on Embankment Materials and Boring Methods)

  • 황무석;정재훈;박승기;이창수;박찬기
    • 한국농공학회논문집
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    • 제50권5호
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    • pp.73-81
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    • 2008
  • This study evaluated the applicability of in-situ concrete pile as a stabilization materials of embankment slopes including agricultural reservoir and rural road etc. The experimental embankment slopes was constructed to investigate the strength properties of in-situ concrete pile with embankment materials and boring methods. The test variable were applied the boring method(driving and augering) and water-cement ratio. In order to analyze the physical and mechanical properties of embankment materials, permeability and water contents test were was performed. Also, the freshly and harden of in-situ concrete properties were measured by the slump and compressive strength tests. The results showed the water content and permeability of embankment materials and boring methods affected on compressive strength of in-situ concrete pile.

감압화학증착의 이단계 성장으로 실리콘 기판 위에 증착한 in-situ 인 도핑 다결정 실리콘 박막의 미세구조 조절 (Manipulation of Microstructures of in-situ Phosphorus-Doped Poly Silicon Films deposited on Silicon Substrate Using Two Step Growth of Reduced Pressure Chemical Vapor Deposition)

  • 김홍승;심규환;이승윤;이정용;강진영
    • 한국전기전자재료학회논문지
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    • 제13권2호
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    • pp.95-100
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    • 2000
  • For the well-controlled growing in-situ heavily phosphorus doped polycrystalline Si films directly on Si wafer by reduced pressure chemical vapor deposition, a study is made of the two step growth. When in-situ heavily phosphorus doped Si films were deposited directly on Si (100) wafer, crystal structure in the film is not unique, that is, the single crystal to polycrystalline phase transition occurs at a certain thickness. However, the well-controlled polycrtstalline Si films deposited by two step growth grew directly on Si wafers. Moreover, the two step growth, which employs crystallization of grew directly on Si wafers. Moreover, the two step growth which employs crystallization of amorphous silicon layer grown at low temperature, reveals crucial advantages in manipulating polycrystal structures of in-situ phosphorous doped silicon.

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In-situ 소음투과손실 측정 및 검증을 위한 기법 개발 (New Method for Measurement and Validation of In-situ Sound Transmission Loss)

  • 이화수;박홍철;윤성호
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 춘계학술대회논문집
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    • pp.795-800
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    • 2008
  • The sound transmission loss is a key index to evaluate the acoustic performance of a car-body structure at the high frequency range. From this paper, a new validation method for in-situ sound transmission loss is proposed. First, in-situ sound transmission loss is measured by using PU intensity probe on the condition of complete vehicle. Second, validation test, which is consisted of internal, external and total frequency response function test, is performed by using volume acceleration source and microphones. Then, these test results are compared to validate the accuracy of in-situ sound transmission loss. Finally, the test result of in-site method is compared with results of two reverberant room test method and SEA analytical method. The reliability of in-situ method is confirmed by these procedures.

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In-situ 광배향법을 이용한 수직배향된 네마틱 액정의 프리틸트각 발생 (Pretilt angle generation of vertically aligned nematic liquid crystal using a in-situ photoalignment method)

  • 김형규;황정연;서대식;한은주;김재형
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 추계학술대회 논문집
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    • pp.507-510
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    • 2000
  • Alignment effects for nematic liquid crystal (NLC) using an in-situ photo-alignment method with obliquely polarized UV exposure on a polyirnide (PI) surface for homeotropic alignment were studied. The high pretilt angle in NLC can be measured by obliquely W exposure of $30^{\circ}$ on the PI surface for 10~20 min. The pretilt angle of NLC generated using the in-situ photo-alignment was higher than that of a conventional photo-alignment method.

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기계적 합금화 및 in-situ와 ex-situ의 혼합공정을 통한 C 도핑된 ex-situ $MgB_2$ 선재 제조 (Mechanical Alloying and Combined Process of in-situ and ex-situ to Fabricate the ex-situ C-doped $MgB_2$ Wire)

  • 황수민;이창민;임준형;최준혁;박진현;주진호;전병혁;김찬중
    • Progress in Superconductivity
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    • 제10권2호
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    • pp.79-86
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    • 2009
  • We successfully fabricated C-doped ex-situ $MgB_2$ wires using two different methods such as mechanical alloying(MA) and combined process(CP) of in-situ and ex-situ. In the MA, the precursor powder was prepared with a mixture of $MgB_2$ and 1 at% C powders by planetary ball milling for 0-100 h. In the CP, on the other hand, C-doped $MgB_2$ powder was prepared with Mg, B, and C powders by in-situ process via compaction, sintering, and crushing. The powders prepared by two methods were loaded into Fe tube and then the assemblages were drawn by a conventional powder-in-tube technique. The MA treatment of C-added $MgB_2$ decreased the particles/grains size and resulted in C-doping into $MgB_2$ after sintering, improving the critical current density($J_c$) in high external magnetic field. For the C-doped $MgB_2$ wire by MA for 25 h, the $J_c$ was $4.1{\times}10^3A/cm^2$ at 5 K and 6.4 T, which was 5.9 times higher than that of pure and untreated $MgB_2$ wire. The CP also provided C-doping into $MgB_2$ and improved the $J_c$ in high magnetic field; the C-doped $MgB_2$ wire fabricated by CP exhibited a $J_c$ being 2.3 times higher than that of the ex-situ wire used commercial $MgB_2$ powder at 5 K and 6.0 T($2.7{\times}10^3A/cm^2\;vs.\;1.2{\times}10^3A/cm^2$).

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New Model of In-situ Xenograft Lymphangiogenesis by a Human Colonic Adenocarcinoma Cell Line in Nude Mice

  • Sun, Jian-Jun;Jing, Wei;Ni, Yan-Yan;Yuan, Xiao-Jian;Zhou, Hai-Hua;Fan, Yue-Zu
    • Asian Pacific Journal of Cancer Prevention
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    • 제13권6호
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    • pp.2823-2828
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    • 2012
  • Objective: To explore a new model of in-situ xenograft lymphangiogenesis of human colonic adenocarcinomas in nude mice. Method: On the basis of establishing subcutaneous xenograft lymphangiogenesis model of human colonic adenocarcinoms, in-situ xenografts were established through the in situ growth of the HT-29 human colonic adenocarcinoma cell line in nude mice. The numbers of lymphangiogenic microvessels, the expression of lymphatic endothelial cell markers lymphatic vessel endothelial hyaloronic acid receptor-1 (LYVE-1), D2-40 and the lymphatic endothelial growth factors vascular endothelial growth factor-C (VEGF-C), -D (VEGF-D) and receptor-3 (VEGFR-3) were compared by immunohistochemical staining, Western bolt and quantitative RT-PCR in xenograft in-situ models. Results: Some microlymphatics with thin walls, large and irregular or collapsed cavities and increased LMVD, with strong positive of LYVE-1, D2-40 in immunohistochemistry, were observed, identical with the morphological characteristics of lymphatic vessels and capillaries. Expression of LYVE-1 and D2-40 proteins and mRNAs were significantly higher in xenograpfts in-situ than in the negative control group(both P<0.01). Moreover, the expression of VEGF-C, VEGF-D and VEGFR-3 proteins and mRNAs were significantly higher in xenografts in-situ (both P<0.01), in conformity with the signal regulation of the VEGF-C,-D/VEGFR-3 axis of tumor lymphangiogenesis. Conclusions: In-situ xenografts of a human colonic adenocarcinoma cell line demonstrate tumor lymphangiogenesis. This novel in-situ animal model should be useful for further studying mechanisms of lymph node metastasis, drug intervention and anti-metastasis therapy in colorectal cancer.