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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 31 (1966), S. 500-506 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 1508-1511 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the effects of particle size and aspect ratio on the hysteresis in controlled arrays of small magnetic particles. The arrays of permalloy particles were fabricated via electron-beam lithography. Each array consists of ∼ 106 identical, uniformly spaced particles. Hysteresis loops measured with an alternating-gradient magnetometer for particles ∼5–0.1 μm are presented. We find an increase in the coercive force as the particle width decreases below 0.3 μm due to a change in the switching mechanism from domain-wall nucleation and wall motion to vortex nucleation and vortex motion. A novel angular dependence of the loops is described in detail. Results from ab initio micromagnetic calculations on isolated rectangular Permalloy particles are compared, where applicable, with the measurements. We find excellent qualitative and, in selected cases, quantitative agreement between the experiments and calculations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6410-6412 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quasistatic and dynamic measurements of the magnetic field induced magnetoelectric polarization (MEH effect) have been performed in the weakly ferromagnetic/ferroelectric/ferroelastic phase of point group m'm2' of Ni-Cl boracite between 1.8 and 9 K (=TC) and above. For the first time the quadratic MEH effect of Ni-Cl boracite has been measured and separated from the linear one. The results allow us to discard the existence of a previously assumed antiferromagnetic phase mm2 between 9 and 25 K. Above 9 K, the phase is paramagnetic (mm21'). The coefficients of the linear (α23, α32) and quadratic (β311, β322, β333, and β223) MEH effect are given for 4.2 K. α32 and β322 are also given vs temperature.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2579-2584 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper presents results stemming from the incorporation of micron- and millimeter-scale electrostatic lenses into an electron projection microscope, wherein the lenses can be used to focus and otherwise influence electron beams emitted from electron point sources. Topics discussed include the impetus for adding lenses to a normally lensless microscope, details of the lens design and fabrication techniques (including two novel methods for making micron-scale lenses and apertures), descriptions of the test procedures and conditions, and the observed results and their possible implications. The advantage of using a millimeter-scale lens to increase the magnification of projected images is illustrated. Then the microfabrication of two-electrode lenses measuring 1 μm in diameter and 1.7 μm in length is described. Although less than ideal, one of these structures performed sufficiently well to create what may be the first electron beam focused by a truly micron-scale lens. The materials and construction procedures used to build lenses by hand with diameter of 20 μm and electrode spacings of 8 μm are described. Two-electrode lenses of this type have demonstrated the capacity to withstand applied biases of over 500 V, and to send an electron beam through crossover with relatively little distortion.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3888-3893 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Detailed techniques for the construction of low (4–300 K) and high (300–700 K) temperature uniaxial stress application devices are described, designed for studying stress-induced effects, including ferroelastic (/ferroelectric) detwinning, induced phase transitions, piezo-optical effects in ferroic crystals under in situ optical control of their domain states by means of polarized light microscopy. Examples of the successful application of these systems to YBa2Cu3O7−δ , K3Fe5F15, and Cr3B7O13Cl crystals are presented and discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    238 Main Street, Cambridge, MA 02142, USA : Blackwell Scientific Publications
    International journal of gynecological cancer 4 (1994), S. 0 
    ISSN: 1525-1438
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: On fresh frozen tumor tissue from 161 patients with endometrial cancer DNA-ploidy and S-phase fraction were measured in a prospective study to evaluate their prognostic and predictive value. All FIGO stage I or II patients had surgery and were included in an adjuvant trial comparing tamoxifen 30 mg p.o. versus medroxyprogesterone acetate 500 mg p.o. for 2 years versus no therapy. Diploid (DNA index (DI) 〈inlineGraphic alt="leqslant R: less-than-or-eq, slant" extraInfo="nonStandardEntity" href="urn:x-wiley:1048891X:IJG04040250:les" location="les.gif"/〉 1.1) tumors were found in 75%. S-phase fraction was elevated (〉5%) in 46 (30%) of the patients. Significant correlations of DNA-ploidy and S-phase fraction were found with classical parameters such as stage, grade, histologic type and estrogen and progesterone receptor status. Patients with FIGO stage I aneuploid tumors showed significantly shorter disease-free interval (DFS) and overall survival (OAS). Recurrences and deaths occurred more often in tumors with raised S-phase fraction. In these early stages clinical outcome was worst if both factors were unfavorable. In multivariate analysis of stage I tumors DNA-ploidy and S-phase fraction were independent of grade, type and estrogen receptor status. Patients whose tumors had elevated S-phase fractions (〉5%) gained more benefit from endocrine treatment than patients with low S-phase fractions. Patients with diploid and aneuploid tumors had prolonged DFS and improved OAS, if they had received adjuvant hormonal therapy. In endometrial cancer, DNA-ploidy and S-phase fraction are objective and reliable prognostic and predictive parameters which should be integrated into the clinical management.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Suite 500, 5th Floor, 238 Main Street, Cambridge, Massachusetts 02142, USA : Blackwell Science Inc.
    International journal of gynecological cancer 5 (1995), S. 0 
    ISSN: 1525-1438
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In a total of 77 patients with epithelial ovarian carcinomas, new biologic parameters [estrogen and progesterone receptor (ER, PR), DNA-ploidy (DP), S-phase fraction (Spf), cycling index (Ki67), Her2b/neu oncoprotein, epidermal growth factor receptor (EGF-R), cathepsin D and P170 glycoprotein] have been simultaneously detected and correlated to the clinical outcome [progression-free (PFI) and overall survival (OAS)] in a preliminary study. Apart from conventional prognosticators (age, stage, grade, residual tumor) and the postoperative serum marker Ca125, DP (P = 0.01), Spf (P = 0.009), Ki67 (P = 0.05) and PR (P = 0.01) could predict a short OAS (log rank test), whereas cathepsin D was of borderline significance only. Prognostic significance could be improved by using combinations of different factors [two markers of differentiation (DP, PR), one marker of proliferation (Spf) and one marker describing local tumor spread (cathepsin D)]. The difference in prognosis between patients with either all or three favorable tumor factors and patients with two to four unfavorable tumor factors reached a similar significance as can be obtained using FIGO stage as a prognostic factor (P = 0.007 for PFI, P = 0.0005 for OAS). These results were similar if early stages (FIGO I and II) were excluded. However, in a Cox regression analysis, including stage and residual tumor, this combination was significantly independent for PFI and OAS and could give additional information. Therefore, the large number of new biologic tumor markers could be restricted to only a few significant prognosticators to predict prognosis in primary epithelial ovarian carcinoma. In the future tumor characterizations may allow more individualized treatment with more aggressive, or even without, cytotoxic therapy after primary surgery.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4237-4239 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared controlled arrays of submicron permalloy particles as part of a program to determine the magnetic properties of verifiable single-domain particles (SDP) and the effects of interactions between SDPs. We have measured the hysteresis loops of these arrays as a function of size, aspect ratio, and spacing. The arrays are fabricated utilizing electron beam lithography and liftoff techniques. Each array consists of approximately 106 identical particles with identical spacing between the particles. Particle size and spacing [center-to-center distance (ccd)], vary from 5 μm×15 μm (width by length) with ccd of 25 μm to 0.07 μm×0.1 μm with ccd of 0.25 μm. The thickness of the films varied from 0.072 to 0.049 μm. Hysteresis loops are obtained utilizing a SQUID magnetometer. For well-separated particles we observe an order of magnitude increase in Hc with decreasing particle size, and then a subsequent decrease in Hc as the ccd is reduced. However, even for the smallest particles, the ratio of the remanence to saturation magnetization indicates that they are not single domain, and the loop shape is not indicative of Stoner–Wohlfarth behavior.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 26 (1961), S. 3090-3094 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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