The synthesis and utilization of low molecular weight ozonides for air revitalization Supplement to interim report of 14 Nov. 1965

Thermal decomposition characteristics of sodium superoxide, sodium peroxide, and lithium peroxide and magnetic susceptibility of calcium superoxid

Effects of carbon incorporation on doping state of YBa2Cu3Oy

Effects of carbon incorporation on the doping state of YBa2Cu3Oy (Y-123) were investigated. Quantitative carbon analysis revealed that carbon could be introduced into Y-123 from both the precursor and the sintering gas. Nearly carbon-free (< 200 ppm) samples were prepared from a vacuum-treated precursor by sintered at 900 &#730;C and cooling with 20 &#730;C /min in flowing oxygen gas. The lower Tc (= 88 K) and higher oxygen content (y = 6.98) strongly suggested the overdoping state, which was supported by the temperature dependence of resisitivity and thermoelectric power. The nuclear quadrapole resonance spectra and the Raman scattering spectra indicated that there was almost no oxygen defect in the Cu-O chain in these samples. On the other hand, in the same cooling condition, the samples sintered in air stayed at optimal doping level with Tc = 93 K, and the intentionally carbon-doped sample was in the underdoping state. It is revealed that about 60% of incorporated carbon was substituted for Cu at the chain site in the form of CO32+, and the rest remains at the grain boundary as carbonate impurities. Such incorporation affected the oxygen absorption process in Y-123. It turned out that the oxygen content in Y-123 cannot be controlled only by the annealing temperature and the oxygen partial pressure but also by the incorporated carbon concentration.Comment: 16pages, 9figure

Determining the Air Gap Length of an Axial Flux Wound Rotor Synchronous Generator

The&nbsp; air&nbsp; gap&nbsp; length&nbsp; of&nbsp; the&nbsp; designed&nbsp; axial&nbsp; flux&nbsp; wound&nbsp; rotor&nbsp; (AFWR)&nbsp; synchronous&nbsp; generator&nbsp; is&nbsp; determined&nbsp; properly according to the design parameters. One of the distinct advantages of&nbsp; an axial&nbsp; flux (AF)&nbsp; machine is&nbsp; its adjustable air gap. An AF generator&rsquo;s performance might be controlled by adjusting its air gap. The designed generator has a small-scale capacity that has 1 kW, 380 V, and 50 Hz. The windings are laid into slots made from laminated core. The slots are carved in the face of the stator and rotors. The generator has a single-double-sided slotted wound stator sandwiched between twin rotors. The effect of air gap changes on its&nbsp; performance can be seen from the calculation results using the given equations. The results reveal electric quantities suited to the machine&rsquo;s effective performance. The smaller the air gap,&nbsp; the&nbsp; greater&nbsp; the&nbsp; efficiency&nbsp; and&nbsp; power&nbsp; factor&nbsp; and&nbsp; the&nbsp; smaller&nbsp; the&nbsp; armature&nbsp; current&nbsp; and&nbsp; voltage.&nbsp; The&nbsp; efficiency&nbsp; and armature current for 0.1 cm air gap are 85.30 % and 1.815 A, respectively

Physical Acoustics

Contains research objectives and reports on three research projects.U.S. Navy (Office of Naval Research) under Contract Nonr-1841(42

EVIDENCE OF POSITIONAL DOPING EFFECTS ON THE OPTICAL PROPERTIES OF DOPED TIN DIOXIDE (SnO2) WITH ZINC (Zn)

Films of pure SnO2 were doped with zinc (Zn.SnO2) via chemical spray pyrolysis method. Its deposition on the glass slide with different doping concentration values of 1 wt.%, 2 wt.%, 3 wt.% and 4 wt.% Zn on SnO2. The optical properties were investigated. The average transmittance, reflectance intensity and optical band gap of the Zn doped SnO2, showed that the results gotten were due to the dopant affinity for any sites on the sample structure which defines the properties of the doped samples. This concept explains the strange functionality noticed in some metallic oxides

Experimental Evidence of Quantum Confinement Impairment In The Optical Properties of Annealed Lead Sulphide Thin Film

Recent characterizations of compounds are undoubtedly one of the avenues for the emergence of new semiconducting-light emitting diode (LED) devices. The industrial application of the lead sulphide thin film has been proposed. The lead sulphide thin film was grown by Chemical Bathe Deposition Technique (CBDT) and annealed at four temperatures of 100oC, 150oC, 200oC and 250oC. The samples were analyzed via the 6045 U-V spectrometer. The results shows that PbS thin film has a low transmittance value ranging from 0.204709% to 0.85722%; absorbance value ranging between 3.026% and 3.564%; reflectance value ranging from 81% to 114%; direct band gap was between 1.66eV to 1.78eV. Hence, the calculated refractive index ranges from 1.67 to 1.669. The evidence of quantum confinement impairment in each annealed samples was proofed. This shows that the optical tuning of the lead sulphide is dependent on the thermal control of its constituent's diamete

Compound basis arising from the basic A1(1)A^{(1)}_{1}-module

A new basis for the polynomial ring of infinitely many variables is constructed which consists of products of Schur functions and Q-functions. The transition matrix from the natural Schur function basis is investigated.Comment: 12 page