• 제목/요약/키워드: paraffin

검색결과 989건 처리시간 0.037초

수화열 저감제의 종류에 따른 콘크리트 품질특성 (Properties of Concrete on the Kind of Hydration Heat Reducing Agent)

  • 전용수
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
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    • pp.59-60
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    • 2011
  • This study is investigated reduced heat hydration and fresh and hardened concrete of high strength concrete by hydration heat reducing agent that is type of alcohol, paraffin wax micro-capsules, and strontium.

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A Micro Cell Counter Integrated with Oxygen Micropump

  • Son, Sang-Uk;Choi, Yo-Han;Lee, Seung-S.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.2441-2444
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    • 2003
  • This paper describes fabrication of a micro cell counter integrated with an oxygen micropump and Sephadex G-25 beads counting experiment. The device utilized a phototransistor, microwindow, and light source of microscope for beads detection. Microheater and microchannel were used for pumping and guiding of beads to the microwindow. Counting capability of the device was tested with a peristaltic pump and the measured signals (${\sim}10\;mV$) with oscilloscope showed peak shape when beads passed the microwindow. Pumping of beads by the oxygen micropump was carried out by heating paraffin, which enveloped manganese dioxide (catalyst), to trigger the decomposition of hydrogen peroxide into water and oxygen. It lasted for 5 min with $7\;{\mu}l$ of wt. 30 % hydrogen peroxide. Beads counting by oxygen micropump showed peaks ($2{\sim}20\;mV$) with $30\;{\mu}l$ of beads sample and the number of peaks by magnitude was acquired.

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기능성 미분말의 제조공정에 관한 연구 : III. 초임계 분출법에 의한 복합분체의 합성과 용출특성 (Preparation process of functional particles: III. Preparation of composite particles by rapid expansion of supercritical fluid solutions and release behavior)

  • 류한원;김영도;신건철
    • 한국결정성장학회지
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    • 제9권1호
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    • pp.55-59
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    • 1999
  • 초임계 분출법을 이용하여 입자의 코팅을 행하였다. 핵입자로는 분무건조법으로 제조된 Microcapsule을 사용하였으며, 코팅 물질로는 녹는 점이 다른 두 종류의 파라핀을 사용하였다. 파라핀이 녹아 있는 초임계 $CO_{2}$ 용액은 공 기에 의해 유통중인 유통층 내부로 작은 직경의 노즐을 통해 분출된다. 이 때 추출조의 온도와 압력은 각각 $50~120^{\circ}C$, $150~200\;kg/\textrm{cm}^2$으로 변화시켰다. 이론적인 코팅 두께를 계산하였으며, 코팅층의 분석은 SEM과 FT-IR을 사용하였다. $Mg^{2+}$ ion의 용출특성은 원자홉광광도계를 사용하여 조사하였다.

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Acellular Dermal Matrices and Paraffinoma: A Modern Tool for a Nearly Obsolete Disease

  • Grassetti, Luca;Torresetti, Matteo;Scalise, Alessandro;Lazzeri, Davide;Di Benedetto, Giovanni
    • Archives of Plastic Surgery
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    • 제44권3호
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    • pp.234-237
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    • 2017
  • Paraffinoma is a destructive complication of paraffin oil injection, usually associated with massive tissue destruction, thus requiring radical surgery and subsequent complex reconstruction. Although breast and penile paraffinomas have been widely described and their management is quite standardized, paraffinomas of the knee are still rare and only few case reports or small case series are available in the current literature. We describe the case of a 77-year-old man with a large paraffinoma of the right knee that occurred after self-injection of paraffin oil, 58 years before. He underwent wide surgical resection of the soft tissues overlying the knee and subsequent two-stage reconstruction by using acellular dermal matrix and, after 20 days, split-thickness skin grafts. Follow-up after 16 months showed no signs of skin ulcerations or inflammation, with an overall improvement in function. Even though conventional flap reconstructions may be still useful, the authors believe that acellular dermal matrices represent a safe, reliable, and less invasive alternative for challenging soft tissue reconstructions even in elderly patients with multiple medical problems.

No Significant Association between Human Papillomavirus and Breast Cancer, Sanandaj, Iran

  • Karimi, Maryam;Khodabandehloo, Mazaher;Nikkhoo, Bahram;Ghaderi, Ebrahim
    • Asian Pacific Journal of Cancer Prevention
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    • 제17권10호
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    • pp.4741-4745
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    • 2016
  • Background and Objective: Any role of human papillomavirus (HPV) in the development of breast cancer is conjectural. The aim of this study was to investigate possible links between HPV and breast cancer in women, Sanandaj, Iran. Methods: In this case-control study, 70 formalin fixed and paraffin embedded blocks of breast malignant tumors as a case group and 70 blocks of lesions without malignancy were selected as controls. Sections about $10{\mu}m$ thick were prepared. After removing the paraffin, DNA was extracted. Samples were tested by PCR using general and high-risk specific HPV primers. Results: All 70 malignant breast tumors (cases) were invasive ductal carcinomas, and of the 70 controls, 17 (24.3%) were fibrocystic tumors and 53 (75.7%) fibroadenomas. The age range of women in the case group was 25-72 years old and in the control group It was13-66 years. Using HPV general primers two samples were positive in the case group, confirmed to be HPV-18 using high-risk specific primers. Conclusion: No statistically significant association was found between breast cancer and HPV. It is necessary to confirm this result by further investigations in other populations.