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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization study on grain-boundary precipitation in a Ni-8 at. % Sn alloy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4832-4834 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The variations of the grain-boundary precipitates, the electrical resistivity, and the magnetization of a Ni-8 at. % Sn alloy have been investigated as functions of annealing temperature and annealing time. For samples annealed at 773 K, the averaged growth rate of the size of the grain-boundary precipitates is roughly 0.42 μm/h for the first 24 h; the electrical resistivity at T=10 K and the magnetization at T=10 K and H=5 kG vary monotonically with respect to the annealing time for the first 2 weeks, changing from 22.5 to 7 μΩ cm for the electrical resistivity and from 27 to 33 emu/g for the magnetization. A large tail section in the magnetization versus temperature curve was also observed in the aged samples. All these electrical and magnetic variations in the Ni-8 at. % Sn samples annealed at 773 K varied monotonically with respect to the growth of the grain-boundary precipitates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344752
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  • 2
    Electronic Resource
    Electronic Resource
    Channel formation in organic field-effect transistors (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4312-4318 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of two-dimensional electrostatic modeling of organic field-effect transistors, focusing on the formation of the conductive channel, are reported. The effect on channel formation of the choice of the source and drain contact metal is investigated for both top- and bottom-contact device structures. High-work-function metal (e.g., gold) source and drain contacts produce a conducting p-type region near these contacts. In contrast, low-work-function metal source and drain contacts (e.g., magnesium) lead to depleted regions. In the center of the device, between the source and drain contacts, the channel carrier density at a fixed gate bias is determined by the work function of the gate contact material, and is essentially independent of the metal used to form the source and drain contacts. The principal difference between top- and bottom-contact structures is the spatial variation of the charge density in the vicinity of the source and drain contacts. The channel carrier density for a fixed gate bias (and gate contact material) between the source and drain electrodes is essentially the same for the two structures. Finally, the dependence of the transistor threshold voltage on the gate contact metal work function and the device implications of the spatial variation of the induced charge density are discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1453509
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  • 3
    Electronic Resource
    Electronic Resource
    Monte Carlo evaluations of degeneracy and interface roughness effects on electron transport in AlGaN–GaN heterostructures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 829-837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Calculations of the electronic mobility and drift velocity have been carried out for bulk GaN and AlGaN–GaN heterojunctions based on a Monte Carlo approach. The bulk calculations were intended to serve as a validity check of the simulation model. For the heterojunction electron mobility calculations, polarization effects, degeneracy, and interface roughness scattering were all taken into account. Degeneracy is shown to play an important role, especially at large gate bias. Very good agreement with available experiments has been obtained, and yields a set of best-fit transport parameters. Our results underscore the dominance of interface roughness scattering, and demonstrate that a parameterized model based on weak-perturbation, Born approximation theory can yield sufficiently accurate results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373744
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  • 4
    Electronic Resource
    Electronic Resource
    Digital spectropolarimeter for the measurement of optical polarization (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4096-4101 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A computerized setup for optical polarization measurements is described. The heart of this setup is a photoelastic modulator (PEM) whose retardation phase can be kept constant when the wavelength of modulated light is scanned in a wide range, and a dual-channel gated photon counter which has the capability of compensating the variation of excitation intensity with time and wavelength. Unlike conventional analog setups, where the difference of two perpendicularly polarized light components (I+ − I−) and the average of these components 1/2(I+ + I−) are extracted electronically and the ratio 2(I+ − I−)/(I+ + I−) is recorded as degree of polarization, this spectropolarimeter directly records the I+ and I− components (for circular polarization) or I(parallel) and I⊥ components (for linear polarization) of the analyzed light signal. Once the spectra of the two components are stored as a numerical file in the computer, they can be processed to extract the degree of polarization as a function of wavelength, temperature, etc. The curvature and asymmetry of the modulator response are taken into account exactly in data processing. The spectropolarimeter has proved to be very accurate due to the capability of compensating the fluctuation in excitation source and of electronically tracking the modulation wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143218
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  • 5
    Electronic Resource
    Electronic Resource
    AUTHORS' REPLY (1995)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 102 (1995), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1995.tb11373.x
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  • 6
    Electronic Resource
    Electronic Resource
    Oophorectomy at the same time as hysterectomy (1994)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 101 (1994), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1994.tb13033.x
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  • 7
    Electronic Resource
    Electronic Resource
    The value of an absorbable adhesion barrier, Interceed®, in the prevention of adhesion reformation following microsurgical adhesiolysis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 101 (1994), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To determine whether Interceed®, an absorbable adhesion barrier, confers any additional benefit over conventional microsurgery, including the use of an adjuvant (hydrocortisone), in the prevention of adhesion reformation after pelvic microsurgery.Design A prospective, randomised, controlled study.Setting Jessop Hospital for Women, Sheffield, UK.Subjects Twenty-eight women who underwent pelvic microsurgery for infertility or for chronic pelvic pain and who had bilateral pelvic adhesions and deperitonealised areas following adhesiolysis.Interventions Following microsurgical adhesiolysis, one side of the pelvis was randomised to have its deperitonealised areas covered with Interceed, whereas the contralateral side served as the control. A second look laparoscopy was carried out 3 to 14 weeks after microsurgery to evaluate adhesion reformation.Main outcome measure The amount of adhesion reformation at second look laparoscopy compared with the amount of deperitonealised area exposed following microsurgical adhesiolysis.Results The use of Interceed resulted in a significant reduction of adhesion reformation over and above that achieved by conventional microsurgical techniques with hydrocortisone as an adjuvant.Conclusion Interceed, an absorbable adhesion barrier, is of value in the prevention of adhesion reformation and may be used in conjunction with hydrocortisone instilled intraperitoneally at the conclusion of microsurgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1994.tb13621.x
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  • 8
    Electronic Resource
    Electronic Resource
    Concentration of endometrial protein PP14 in uterine flushings throughout the menstrual cycle in normal, fertile women (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To determine the variation in concentration of endometrial protein PP14 in uterine flushings throughout the menstrual cycle comparing this to concentrations in plasma samples.Design Precise timing of all samples by the luteinising hormone surge.Setting Jessop Hospital for Women, Sheffield.Subjects Twenty-three regularly cycling, previously fertile volunteer women.Interventions Observational study; 10 ml of physiological saline was used to flush the uterine cavity once or serially in the cycle of the study.Main outcome measures The measurement of PP14 levels by radioimmunoassay in uterine flushings and plasma samples.Results In uterine flushing, PP14 levels were not detectable in significant amounts in the proliferative phase and the early luteal phase; after day LH+6, the concentration rises rapidly with a doubling time of only 6.6 to 14.6 h in the midluteal phase. In the late luteal phase, the concentrations in uterine flushing were over a hundred times higher than the corresponding plasma samples.Conclusions The measurement of PP14 in uterine flushings is likely to be of greater value than the measurement in plasma samples; it may provide a valuable alternative to the evaluation of endometrial function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb15272.x
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  • 9
    Electronic Resource
    Electronic Resource
    A study of endometrial morphology in women who failed to conceive in a donor insemination programme (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To examine the morphology of endometrium in women who failed to conceive after nine or more cycles of donor insemination treatment.Design Prospective study.Setting Jessop Hospital for Women, Sheffield.Subjects Two groups: twenty-six infertile women and a control group of eight fertile women.Intervention Endometrial biopsy specimens were obtained in the mid-luteal phase, timed precisely by the luteinising hormone surge.Main outcome measure Morphological study of endometrial biopsy specimens by the use of traditional dating criteria and established morphometric techniques.Results Twelve biopsy specimens (42%) were found to be retarded. In addition, morphometric analysis revealed significant differences in the glandular component of the endometrium between the infertile and fertile groups.Conclusion Endometrial defect leading to implantation failure may be an important underlying cause of failure to conceive after repeated attempts at donor insemination. The endometrium should be investigated in this group of women, and further attempts at donor insemination treatment should be offered only in conjunction with attempts to restore the normality of the endometrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb15111.x
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  • 10
    Electronic Resource
    Electronic Resource
    An analysis of factors influencing the outcome of 232 consecutive tubal microsurgery cases (1991)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 98 (1991), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. A consecutive series of 232 tubal microsurgical operations performed at the Jessop Hospital for Women, Sheffield, between 1983 and 1989, was analysed. The various contributory factors to tuboperitoneal damage were reviewed. Eighty patients (35%) conceived, resulting in 66 (29%) live births and 14 (6%) miscarriages. A further 12 (5%) had ectopic pregnancies. The overall cumulative conception rate (CCR) was 40% at the end of 50 months. Microsurgery has been most successful in the adhesiolysis group (n=78) with a CCR of 46% at the end of 50 months. The terminal salpingostomy group (n=97) had a CCR of 40% at the end of 36 months. There was a significant reduction in the live birth rate for the group with hydrosalpinx 〉20 mm in diameter compared with the group with 〈20 mm (P=0.05). The proximal anastomosis group (n=27) had a CCR of 33%. No pregnancy was reported following reconstructive surgery for multiple occlusion sites. Overall, the extent of pelvic adhesions had a significant influence on the outcome (P=0.02). The likelihood of conception was significantly influenced by the duration of infertility (P=0.02) but not affected by the aetiology of tuboperitoneal damage, parity or age of the patient. In our hands, tubomicrosurgery is more cost-effective than in-vitro-fertilization as a primary treatment of infertility due to tubal diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1991.tb13447.x
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