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  • 2000-2004  (16)
  • 2001  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Ex situ spectroscopic ellipsometry investigation of the layered structure of polycrystalline diamond thin films grown by electron cyclotron resonance-assisted chemical vapor deposition (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1280-1285 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline diamond thin films deposited by electron cyclotron resonance-assisted chemical vapor deposition on Si (111) were investigated using spectroscopic phase-modulated ellipsometry from the near IR to UV range (830–270 nm). Analysis of the raw ellipsometry data [ψ(λi), Δ(λi)] by applying the conventional Bruggeman effective medium theory and linear regression analysis provided details about the film microstructure: (i) the multilayer structure and the component layer thickness of the films; (ii) the volume fraction of the constituents (sp3- and sp2- bonded carbon) and of voids (fv) in the bulk layer (L2); (iii) the inhomogeneity of the structure along the growth axis and its variation with the seeding density; and (iv) the surface roughness layer thickness (dS). A simplified three-layer structural model consisting of an interfacial layer, an intermediate (or bulk) layer, and a top surface roughness layer has been proposed that simulates the ellipsometry data reasonably well. The results obtained through ellipsometry modeling, such as surface roughness and overall film thickness, were compared with those from atomic force microscopy and profilometry, respectively, in order to validate the model employed. Typically, high surface roughness values around 60 nm were found for films grown under different substrate temperatures and oxygen-to-carbon ratios. It was also found that a combination of relatively high substrate temperature and O/C ratio can be used to reduce the surface roughness to around 25 nm. In general, the void fraction (fv) of the bulk layer decreases as a function of seeding density, indicating the formation of a denser film. The sp2-bonded carbon fraction (fsp〈sup ARRANGE="STAGGER"〉2 C) also varies with the process parameters. These results (fv and fsp〈sup ARRANGE="STAGGER"〉2 C) for the bulk layer and its behavior with respect to process parameters are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384487
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the electron field emission and microstructure correlation in nanocrystalline carbon thin films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5671-5675 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline carbon thin films were deposited by hot-filament chemical vapor deposition using a 2% concentration of methane in hydrogen. The films were deposited on molybdenum substrates under various substrate biasing conditions. A positive bias produced a continuous flow of electrons from the filament onto the substrate, while a negative bias caused the substrate to be bombarded with positive ions. Films were also grown under no bias, for comparison. Differences in the electron field emission properties (turn-on fields and emitted currents) of these films were characterized. Correspondingly, microstructural differences were also studied, as characterized with atomic force microscopy and Raman spectroscopy. Films grown under electron bombardment showed lower turn-on fields, smoother surfaces, and smaller grains than those grown under ion bombardment or no bias. A correlation between the enhanced emission properties and the nanocrystalline carbon material produced by the low-energy particle bombardment was found through the parameters obtained using spectroscopic ellipsometry modeling. The results confirm the significant role of defects on the electron field emission mechanism. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1367873
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  • 3
    Electronic Resource
    Electronic Resource
    Enhanced room-temperature magnetoresistance in La0.7Sr0.3MnO3-glass composites (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 362-364 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter, we report the improved magnetotransport properties of La0.7Sr0.3MnO3-borosilicate glass composite with different weight percents of glass. All the composites showed ferromagnetic nature at room temperature. The microstructure of these composites was seen using a scanning electron microscope. The microstructure was reconfirmed using spot energy dispersive x-ray analysis. We observe an enhancement of the low-field magnetoresistance (〈200 Oe) at room temperature for the optimal composition of 25 wt % of glass. It is argued that glass layer separating the grain boundaries may be acting as barrier for spin-polarized tunneling, thereby enhancing the low-field magnetoresistance. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342044
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  • 4
    Electronic Resource
    Electronic Resource
    Electron field emission from sulfur-incorporated nanocrystalline carbon thin films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3446-3448 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are reported on the electron field emission properties of sulfur-incorporated nanocrystalline carbon (n-C:S) thin films grown by hot-filament chemical vapor deposition technique. The lowest turn-on field values observed were around 4.0–4.5 V/μm, which are about half of those measured for films grown without sulfur. Associated to the effect of addition of sulfur on field emission properties, there are interesting microstructural changes, as characterized with scanning electron microscopy, atomic force microscopy, and Raman spectroscopy techniques. The sulfur-incorporated films show smoother and finer-grained surfaces than those grown without sulfur. These results are similar to those found for the introduction of nitrogen, but different to those produced by oxygen addition to the chemical vapor deposition process. These findings are attributed to changes in the electronic band structure. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1411988
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  • 5
    Electronic Resource
    Electronic Resource
    Microfilariae in association with neoplastic lesions: report of five cases (2001)
    Oxford UK : Blackwell Science Ltd
    Cytopathology 12 (2001), S. 0 
    Details
    ISSN: 1365-2303
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Microfilariae in association with neoplastic lesions: Report of five cases Microfilariae and adult filarial worms have occasionally been detected in association with neoplastic lesions in cytological smears. The presence of microfilariae along with neoplasms is generally regarded as a chance association, yet some authors suggest that such parasitic infestations may be a causative factor for tumourigenesis. There are only a few reported cases in cytology literature documenting this association. We report the presence of microfilariae in routine cytology smears from one benign and four malignant tumours. Microfilariae could not be identified on histopathology available in four of these cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2303.2001.00301.x
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  • 6
    Electronic Resource
    Electronic Resource
    Response of chronic bullous dermatosis of childhood to a combination of dapsone and nicotinamide (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 15 (2001), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0926-9959.2001.00269-9.x
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  • 7
    Electronic Resource
    Electronic Resource
    Multiple epidermoid cysts on photodamaged skin mimicking sebaceous gland hyperplasia and senile comedones (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 15 (2001), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1468-3083.2001.00219-3.x
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  • 8
    Electronic Resource
    Electronic Resource
    Multiple linear eccrine spiradenomas with eyelid involvement (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 15 (2001), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Eccrine spiradenoma is an uncommon tumour of the sweat gland and usually occurs as a solitary small painful nodule. Very rarely, it may present as multiple tumours arranged in a linear/zosteriform fashion. We present the case of a 23-year-old female who had multiple spiradenomas arranged linearly from the midline of forehead to the left corner of the mouth and a few lesions also on the margin of the left eyelid. The lesions were probably along the Blaschko’s lines. Tumours were excised surgically in stages. Literature search revealed only 13 reported cases of linear/zosteriform/naevoid multiple spiradenomas and only four cases of solitary spiradenoma of the eyelid. The review of reported cases suggests that arrangement of tumours in a linear/zosteriform pattern is an important diagnostic clue for multiple (naevoid) spiradenomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1468-3083.2001.00234.x
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  • 9
    Electronic Resource
    Electronic Resource
    The acetowhite test in genital human papillomavirus infection in men: what does it add? (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 15 (2001), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Many genital human papillomavirus (HPV) infections are clinically invisible epithelial lesions. They remain so for a considerable time before some develop into clinically apparent lesions. The inapparent and asymptomatic nature of these lesions poses a problem in the detection and management of genital HPV infection. Without reliable, and readily available diagnostic methods, no definite therapeutic approach can be recommended or followed. The acetowhite test has been recommended to help determine the extent of the affected area.〈section xml:id="abs1-3"〉〈title type="main"〉ObjectiveTo evaluate the acetowhite test in detecting inapparent subclinical HPV involvement in male patients with clinically apparent warts.〈section xml:id="abs1-4"〉〈title type="main"〉MethodsTwo hundred and two uncircumcised patients with genital warts were included. Patients with concomitant inflammatory lesions were excluded. The warts and adjacent normal skin/mucosa of normal appearance were wrapped in gauze soaked in 5% acetic acid for about 3–5 min. The area was subsequently examined with a hand lens (× 8).〈section xml:id="abs1-5"〉〈title type="main"〉ResultsAll of the 116 hyperplastic warts became acetowhite, as well as a narrow rim of surrounding skin. Few flat warts in dry areas only became dull white and none pure white. No whiteness was observed in the surrounding area. Only 15 of 26 flat warts in moist areas became acetowhite. One (eroded lesion) of 13 verruca vulgaris type lesions and none of the pigmented papules gave positive results to the acetowhite test.〈section xml:id="abs1-6"〉〈title type="main"〉ConclusionsThe sensitivity of the acetowhite test for hyperplastic warts is very high, but for other types of warts is low. Detection of subclinical HPV-infected areas is difficult; the acetowhite test did not assist in the identification of additional areas of infection in our patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1468-3083.2001.00196.x
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  • 10
    Electronic Resource
    Electronic Resource
    Blunt abdominal trauma with delayed rupture of splenic haematoma in a haemophiliac patient (2001)
    Oxford UK : Blackwell Science Ltd
    Haemophilia 7 (2001), S. 0 
    Details
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 13-year-old haemophilia A patient presented with pain in the abdomen, 4 days after a blunt abdominal trauma. The computed tomography scan of the abdomen showed a large splenic haematoma. The patient was initially managed with factor VIII replacement therapy, but 4 weeks later he had a delayed rupture of the splenic haematoma with haemoperitoneum and shock. An elective splenectomy under factor VIII therapy was successfully performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2516.2001.00499.x
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