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  • 1
    Electronic Resource
    Electronic Resource
    Reduction of secondary defects in MeV ion-implanted silicon by means of ion beam defect engineering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3780-3784 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new concept of ion beam defect engineering is proposed. Reduction of secondary defects in 1 MeV As ion-implanted Si(100) has been investigated by Rutherford backscattering/channeling and high resolution electron microscopy. It is found that the additional irradiation of 1.6 MeV Si ions prior to two-step thermal annealing leads to a noticeable reduction of secondary defects. Good recrystallization of a buried amorphous layer is also obtained by irradiation of 1.6 MeV, 2×1015 Si/cm2 into the implanted Si sample held at elevated temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350889
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of the Na+ Channel Blocker Pilsicainide on the Electrophysiologic Properties of Pulmonary Veins in Patients with Atrial Fibrillation (2004)
    350 Main Street , Malden , MA 02148-5018 , USA , and 9600 Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Science Inc
    Journal of cardiovascular electrophysiology 15 (2004), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Introduction: Na+ channel blockers are used to treat atrial fibrillation (AF). However, the effects of Na+ channel blockers on the electrophysiologic properties of pulmonary veins (PVs) are not well characterized. The aim of the present study was to evaluate the effect of the pure Na+ channel blocker pilsicainide on the PVs. Methods and Results: PV mapping using a basket catheter was performed in 28 patients with paroxysmal AF. Twenty-eight PVs, including 20 left superior and 8 right superior PVs, were studied. Programmed stimulation was performed in the distal PV and PV-left atrial (LA) junction before and after infusion of pilsicainide (1 mg/kg). Pilsicainide significantly prolonged the effective refractory period (ERP) of the distal PV from 163 ± 44 msec to 192 ± 53 msec (P 〈 0.001), PV-LA junction from 227 ± 48 msec to 235 ± 52 msec (P 〈 0.05), and LA appendage from 225 ± 55 msec to 245 ± 48 msec (P 〈 0.05). Pilsicainide significantly prolonged the conduction time from the distal PV to PV-LA junction from 45 ± 14 msec to 70 ± 26 msec (P 〈 0.0001). In 3 of 5 patients who experienced AF termination with pilsicainide, PV-LA conduction block was observed just before AF termination. Conclusions: Pilsicainide can modify ERP heterogeneity and conduction properties in the PV and at the PV-LA junction. Because the PV and PV-LA junction have important roles as substrates for AF maintenance, pilsicainide may terminate AF by pharmacologic PV isolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1540-8167.2004.04430.x
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Gd2Fe17−xGaxC2 compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6259-6261 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The single-phase compounds of Gd2Fe17−xGaxC2 (x=0, 1, 2, 3, 4, 5, and 6) with rhombohedral Th2Zn17-type structure were prepared by melt spinning for x≤1 and arc melting for x≥2. Their formation, structure, and magnetic properties were studied. The substitution of Ga for Fe in Gd2Fe17C2 helps the formation of the 2:17-type structure. The addition of Ga results in the increase of the lattice constants and the unit-cell volumes. The Curie temperature has a small change when x≤2, and then decreases rapidly with increasing Ga concentration. An approximately linear decrease of the saturation magnetization with x is observed when the nonmagnetic Ga atom is substituted for Fe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355417
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  • 4
    Electronic Resource
    Electronic Resource
    Metastable Nd2(Fe1−xCox)23B3 (0≤x≤1.0) compounds with the 2:23:3-type structure : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6763-6765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Nd2(Fe1−xCox)23B3 (0≤x≤1.0) alloys were prepared by melt spinning at a speed of 47 m/s. When the amorphous samples were annealed at 900 K for 20 min, they crystallized to the metastable 2:23:3 single phase for all x. A detailed study of structure and magnetic properties of metastable Nd2(Fe1−xCox)23B3 compounds has been made by x-ray diffraction and magnetization measurements. They are body-centered cubic, and the lattice constant decreases linearly from a=14.16 A(ring) for x=0 to 13.86 A(ring) for x=1.0. The Fe atom moment μ¯Fe for Nd2(Fe1−xCox)23B3 was found to increase with x from 2.02μB for x=0 to 2.17μB for x=0.8, when the Co atom moment μ¯Co is assumed to be constant, as made in previous papers for crystalline Fe–Co alloys. The Curie temperature Tc is found to increase monotonically with increasing x from 659 K for x=0 to about 1218 K for x=1.0. The thermomagnetic measurements showed that when the Nd2(Fe1−xCox)23B3 compounds were heated to certain temperatures, they decomposed to Nd2(Fe,Co)14B and α-(Fe,Co) phases. The decomposition temperature of metastable compounds was about 990±15 K, and was almost independent of the Co concentration x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358124
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  • 5
    Electronic Resource
    Electronic Resource
    Capacitance–voltage characteristics of Bi4Ti3O12/p-Si interface (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1784-1786 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical properties of the interface between Bi4Ti3O12 ferroelectric film and p-Si substrate have been studied by capacitance–voltage (C–V) characteristics. It is found that the interface barrier can be broken down temporally because of the charge injection from Si substrate into the ferroelectric thin film, and this charge injection behavior induces hump and valley structures in the C–V curves. It is also found that the polarization in the Bi4Ti3O12 film is aligned along a preferential direction from semiconductor to ferroelectric thin film, which is attributed to the ferroelectric/p-Si contact. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121184
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of electron affinity in boron-doped diamond from capacitance spectroscopy (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2891-2893 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Boron-doped diamond film sample has been grown on (100) silicon substrate using the microwave enhanced chemical vapor deposition method. It is found that the sample has very good material qualities and an excellent (100) surface morphology. Au/diamond Schottky was fabricated on the (100) surface to study electron affinity of the diamond sample. By measuring frequency dependence capacitance–voltage spectroscopy of the Schottky sample in high vacuum and at room temperature, a very small electron affinity of about 0.025 eV and a work function of about 5.165 eV have been obtained for the (100) surface of the diamond sample supposing the diamond band gap energy is 5.5 eV. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119044
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  • 7
    Electronic Resource
    Electronic Resource
    Nanometer-Au-particle-enhanced photorefractivity in a polymer composite (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3243-3245 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Doped with nanometer Au particles, a low-Tg photorefractive polymer composite, poly(N-vinylcarbazole):2,4,7-trinitro-9-fluorenone:4-(dicyanovinyl-N,N-diethylaniline), exhibited an effective enhancement on its photorefractivity. Measurements on two-beam coupling (TBC) as well as four-wave mixing were carried out at 633 nm wavelength. At an applied electric field of 118 V/μm, TBC coefficient as high as 206 cm−1 was obtained in the sample doped with Au particles, while only 152 cm−1 in the sample without Au particles. The measurements on the effective electro-optic coefficient and the photorefractive phase shift for two samples with and without doping Au particles were performed, respectively. The observations of distinct difference on the photorefractive phase shift and no difference on the effective electro-optic coefficient implied that enhancement on the photorefractivity was due to the increment of the density of the effective trap center by doping Au particles. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125360
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  • 8
    Electronic Resource
    Electronic Resource
    Caries prevalence and patterns in 3–6-year-old Beijing children (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 23 (1995), S. 0 
    Details
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract A total of 400 Beijing children. 3–6-yr-old. equally distributed by age and sex, were examined for dental cares. Results were analyzed with the traditional dmfs/t index and with the Caries Analysis System. The system differentiated between caries patterns and examined the percentage of affected children (Prevalence), the degree to which these children were affected (Severity), and the proportion of total caries each disease pattern represented (Distribution). Over 67% of the children experienced caries, a level comparable to other reports from China and other developing countries, but 50% greater than those seen in United Stales preschool children. Nearly all children with caries experienced fissure caries. In 3-yr-olds maxillary anterior caries was the next most prevalent pattern with 43% affected, whilst in the 6-yr-olds, posterior proximal caries was the second most prevalent pattern with 68% affected. Since maxillary anterior caries was so prevalent, and because the presence of this pattern has been shown to be a risk factor for future caries, preventing the maxillary anterior pattern may markedly reduce caries in this population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0528.1995.tb00259.x
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  • 9
    Electronic Resource
    Electronic Resource
    Dental caries in preschool Beijing and Connecticut children as described by a new caries analysis system (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 22 (1994), S. 0 
    Details
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract – A total of 625 children, 3-4 yr old, 426 from Connecticut Head Start programs and 199 from Beijing area nursery schools, were clinically examined for dental caries. Results were analyzed using the traditional dmfs index as well as a new “Caries Analysis System”. This new system differentiated between caries patterns and examined the percentage of affected children (Prevalence), the degree to which these children were affected (Severity) and the proportion of total caries each disease pattern represented (Distribution). The Caries Analysis System revealed differences in caries experience and patterns among the racial/ethnic groups that the dmfs index did not. The Beijing children experienced the greatest Prevalence of all caries patterns; however, the Severity and Distribution of the caries patterns were similar to those of the Connecticut children. Within the group of Connecticut children, White children had the lowest Prevalence but the greatest Severity when compared with the Black and Hispanic children.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0528.1994.tb01580.x
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  • 10
    Electronic Resource
    Electronic Resource
    Aqueous Sol-Gel Route to Barium Aluminosilicate Glass-Ceramics (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The rapid hydrolysis of some alkoxides creates problems in alcohol-based sol–gel processes. This paper describes a simple aqueous sol–gel process for the synthesis of barium aluminosilicate gels and gel-derived glasses, in which the problem of the rapid hydrolysis of aluminum isopropoxide (the source of aluminum) is solved by a precipitation–peptization process that is cost effective. Tetraethylorthosilicate, aluminum isopropoxide, and barium acetate are used as the starting materials, and water is the solvent. The molecular network, crystallization behavior, weight-loss, and thermal characteristics of the gel and the gel-derived glass have been detected by Raman spectroscopy, XRD, DTA, and TGA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01756.x
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