• Title/Summary/Keyword: Fibrous

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Distortion of Eelectrical Double Layer in Liquid Filtration by Fibrous Filters

  • Lee, Myong-Hwa;Hirose, Shogo;Otani, Yoshio
    • Particle and aerosol research
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    • v.10 no.3
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    • pp.99-108
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    • 2014
  • Liquid filtration by membrane filters is essential for the preparation of ultrapure water in semiconductor manufacturing processes. The separation of submicrometer particles suspended in ultrapure water with a laminated fibrous membrane filter was studied numerically and experimentally in the present work. We found that an electrical double layer around a single fiber expanded to a large extent at a low ion concentration, as in ultrapure water, and deformed toward the upstream of the fiber with increasing filtration velocity. Since an increase in the electrical double-layer thickness leads to a decrease in the electrical potential gradient, particles with the same polarity as the fiber approach the fiber more easily and are captured at a high filtration velocity. Experimental results also confirmed that the collection efficiency of polystyrene latex(PSL) particles through a PTFE filter became higher as the filtration velocity increased.

THE USE OF ENDOSCOPY IN ENUCLEATION OF JAW CYSTS (악골 낭종 적출술시 내시경의 이용)

  • Kim, Young-Kyun
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.27 no.1
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    • pp.61-64
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    • 2001
  • This study evaluated the use of endoscopy to examine jaw cysts during the operation. Fifteen jaw cysts were explored with a endoscope immediately before and after enucleation. Endoscopic findings were evaluated and recorded with video tape. Before enucleation, there were many white fibrous floating materials within the cystic cavity. Cystic lining showed smooth and regular appearance with capillary network. However, there were some fibrous scar tissues and irregular architecture in preoperative infection. After enucleation, there were white shiny bony surfaces with fresh vascular network. In some cases, floating fibrous tissues remained after removal.

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Algorithm Development for Infiltration Control in Component Fabrication Process of Metal Matrix Composites and Their Evaluation (금속기복합재료의 부품 제조공정에 관한 함침제어알고리즘 개발 및 평가)

  • Kang, Chung-Gil;Yun, Kung-Sik
    • Journal of Korea Foundry Society
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    • v.16 no.6
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    • pp.523-536
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    • 1996
  • This paper relates to fabrication processing analysis of metal matrix composites by the injection of liquid metal into a fibrous preforms. One dimensional heat transfer analysis during squeeze infiltration process of aluminum base composites has been studied. An analysis method was investigated for the temperature distribution, infiltration velocity and melt infiltration characteristics with the commercial preform with short fiber array. When molten metal is infiltrated in a fibrous preform with random orientation, phase transformation will be occurred in a region such as molten metal, solidified region, preform region and infiltration composites region. a mathematical modelling for a solidification phenomena in fabrication process of metal matrix composites using a squeeze infiltration technique was investigated by the basic relations for liquid metal into a fibrous preform. The temperature distribution of theoretical results was compared with experimental data.

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Bronchial Brushing and Bronchial Washing Cytologic Features of Primary Malignant Fibrous Histiocytoma of the Lung - A Case Report - (폐의 원발성 악성 섬유성 조직구종의 기관지솔질과 기관지세척 검사의 세포학적 소견 - 1예 보고 -)

  • Park, Mi-Ok;Ahn, Wook-Su
    • The Korean Journal of Cytopathology
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    • v.10 no.2
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    • pp.151-155
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    • 1999
  • A case of primary malignant fibrous histiocytoma(MFH) of the lung occurring in a 62-year-old man is presented. After preoperative bronchial blushing and washing cytologic diagnosis of poorly differentiated carcinoma, surgical resection and lymph nodes dissection were performed. Subsequent histologic examination revealed a primary MFH. The diagnosis was confirmed by electron microscopic and immunohistochemical examinations. The review of the bronchial brushing and washing cytologic features disclosed many bipolar and a few unipolar spindle tumor cells with a "comel" configuration, mainly single cells, but also forming loose clusters. The nuclei were elongated and hyperchromatic and contained one or more irregular nucleoli. Scattered bizarre, multinucleated tumor giant cells were also present.

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Polygranulomatosis in the domestic chickens (닭에서 발생한 다발성 육아종증)

  • Lee, Nam-Jin;Cho, Kyoung-Oh;Kang, Mun-Il
    • Korean Journal of Veterinary Pathology
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    • v.7 no.1
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    • pp.67-69
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    • 2003
  • Three mature layer chickens from a farm in which chickens showed green diarrhea, cyanosis, lethargy, loss of appetite were pathologically examined. Grossly, multiple variable sized caseous nodules were detected in the liver, intestinal serosa and mesentery. In addition, parathypoid nodules in the liver and fibrous serositis on the several peritoneal organs and tissues were noticed. One of spleens had multiple infarction areas. Histologically caseous nodules consisted of central caseous core and peripheral epithelioid cells overlying the fibrous connective tissue. Multinucleated giant cells were scattered between the epithelioid cells and fibrous connective tissue. In these nodules Gram negative cocobacilus bacterial colonies were present, whereas Periodic Schiff reaction and Ziehl-Neelsen stain detected neither fungi nor acid fast bacteria. From these results multiple granulomas might be induced by Escherichia coli. In addition, severe Ascafdiodf and Salmonellosis were coinfected in these chickens.

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Fibrous Dysplasia of the Clivus

  • Kim, Ealmaan
    • Journal of Korean Neurosurgical Society
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    • v.48 no.5
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    • pp.441-444
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    • 2010
  • Fibrous dysplasia (FD) of craniofacial structures is well documented, however, its involvement of the clivus is seldom described. We report a case of clival FD in a young man who presented with headache localized to the occipital area. The radiological studies revealed a monostotic disease confined to the clivus, with typical findings of hypo intensity on magnetic resonance images and ground-glass density on computed tomography. The diagnosis of FD was confirmed on pathological examination of specimens taken through transsphenoidal surgery. The patient showed reduction of symptoms and no change of residual lesion on follow-up imaging taken 2.5 years later after surgery. This study includes clinical aspect, radiographic appearance, differential diagnosis and treatment strategy of this rare skull base lesion.

Fine Needle Aspiration Cytology on Solitary Fibrous Tumors of the Pleura (흉막의 고립성 섬유성 종양의 세침 흡인 세포학적 검색)

  • Keum, Joo-Seob;Lee, Jung-Dal
    • The Korean Journal of Cytopathology
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    • v.2 no.2
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    • pp.134-141
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    • 1991
  • Localized or solitary fibrous tumor (SFT) of the pleura has been classified as a type of mesothelioma, arising from the submesothelial connective tissue cells. The preoperative diagnosis of the tumor at the cytologic or histologic level is very important for the proper handling of the lesion. This preoperative diagnosis is now possible by means of the advance in the transthoracic fine needle aspiration biopsy (FNA) techniques and in the very experience of the cytopathologists. We describe FNA cytologic feature of two cases of SFT arising from the pleura. Cytologic, histologic, immunohistochemical, and electron microscopic characteristics of pleural SFT are discussed. The tumor cells of SFT are spindle or oval in shape with a variable amount of cytoplasm. They are arranged in irregular trabeculae intimately associated with capillaries. A unique cytologic feature observed in this tumor is that thick, eosinophilic, amorphous collagen bundles are scattered between tumor cells.

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A CASE REPORT OF THE MALIGNANT FIBROUS HISTIOCYTOMA OF THE MANDIBLE (하악골에 발생된 악성 섬유성조직구종의 증례보고)

  • Park Chang Seo
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.14 no.1
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    • pp.163-168
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    • 1984
  • The author observed a case of the malignant fibrous histiocytoma of the mandible in 23 aged male patient, who had come to the Infirmary of Dental College, Yonsei University. With the help of careful analysis of radioraphic and clinicopathologic findings, the author had obtained the results as follows. 1. Lesion occured at 22 years of age. 2. Traumatic history or other special predisposing factors were not seen. 3. Lesion appeared as a intra osseous primary tumor not showing any metastatic change. 4. The author have concluded this disease as a malignant fibrous histiocytoma of the mandible according to serial findings.

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Deduction On Fatigue Strength of Two Span Continuous Beams with Steel Fibrous (강섬유를 혼입한 2경간 연속보의 피로강도 추정)

  • 곽계환;곽경헌;정태영
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2001.04a
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    • pp.359-364
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    • 2001
  • Recently structural damage has been frequently observed in reinforced concrete bridges due to repeted ioads such as vehicular traffic and due to continual overloads by heavy trucks. Therefore. In this study, the static tests and the fatigue tests were performed on a series of SFRC(steel fibrous reinforced concrete) to investigate the fatigue behavior of SFRC varying with the steel fibrous contents. Through this test, the diagonal cracking loads, ultimate loads, deflections, strains of concrete and steel. On this basis, the crack growth and failure of SFRC beams were studied, and a model for S-N relationship of SFRC was proposed.

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Solitary fibrous tumor of Pleura - 1 case report - (흉막에 발생한 고립성 섬유종 - 외과적 치험 1례 -)

  • 금동윤;원경준;강동욱
    • Korean Journal of Bronchoesophagology
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    • v.8 no.1
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    • pp.87-91
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    • 2002
  • Solitary fibous tumor of pleura is a rare and slow vowing neoplasm. The histogenesis of this tumor is thought as mesenchymal origin by immunohistochemical and ultrastructural bases. This case report is of a 69-year-old female who presented severe dyspnea and orthopnea with long-term history. Preoperative chest X-ray an chest CT revealed huge and hemithorax-occupying heterogenous mass and cardiomegaly. She underwent surgical resection and a 22 X 18 X 10 cm sized visceral pleural based mass was evacuated. Histologic findings of tumor showed patternless proliferation in a fibrocollagenous and well vasculized stroma. Immnohistochemical staining revealed strong positive in CD34, that are compatible with solitary fibrous tumor of pleura. The patient was discharged without any complications and no evidence of recurrence was found after 2 years.

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