Chimney Design and Chimney Formula Comparison

The object of this thesis, then is to compare chimney wall sections conforming with the accepted rules as quoted by Kent, Kidder, Molesworth, and Christie, with wall sections obtained by formulas that were derived by means of an analysis similar to that in the preceding paragraph; to show chimney wall sections of uniform height and of diameters varying from one to ten feet, assuming the upper wall thickness in all cases to be the same as the used in common practice and keeping sure constant so that the several chimneys may be compared as to relative volume, outline, stress, and batter. A light review of concrete chimneys, chimney functions, and present features will first be given to add to the completeness of the discussion

Photoionization Of Atomic Oxygen At The Multiplet Term Level From 20 To 212 Ev

The valence shell photoionization branching ratios of atomic oxygen are measured at the multiplet term level in a synchrotron-radiation-based electron spectrometry experiment and calculated using the multiconfiguration Hartree-Fock (MCHF) method for photon energies between 20 and 212 eV. The 2p (S-4,D-2,P-2) branching ratios, 2s P-2 to 2s P-4 intensity ratio, and 2s to 2p cross-section ratio for removal of a 2s of 2p electron are presented, and satisfactory agreement between the experiment and the MCHF calculation is found. In addition, the relative photoionization cross section is measured between 24 and 122 eV and is compared with calculations and a previous absolute cross-section measurement. Good agreement between the experimental and MCHF results is seen

High-resolution photoelectron spectrometry of autoionizing resonances between the P-3 and D-1 thresholds in atomic chlorine

We present a measurement of the partial and differential photoionization cross sections for production of the fine-structure states of Cl+ P-3(J) in the region of the (3)p(41)Dnl (l = 0,2) autoionizing resonances. All series of resonances show distinctive behavior for the J=2 to J=1 cross-section ratio. The angular distribution parameter beta was also measured for the two principal ionic states (J = 1,2). The behavior of beta is very similar for both J=1,2 channels, except at the LS-forbidden nd(2)S resonance series, where the J=2 channel shows a pronounced dip that indicates an important contribution from the parity-unfavored epsilon d photoelectron waves. The widths of the 4d(2)S, 6s(2)D, and 7s(2)D resonances were measured and the results are compared with available theoretical calculations

Angle-Resolved Photoelectron Spectrometry Of Atomic Nitrogen

The relative photoionization cross section of atomic nitrogen across the 2s2p3(5S(o))np(4P(e)) autoionizing states and the beta parameter over the 2s -- \u3e 3p and 4p resonances are measured using synchrotron-radiation-based photoelectron spectrometry. Results are compared with a multiconfiguration Hartree-Fock calculation. Resonance energies for autoionizing states from n = 3-10 are presented and compared with an earlier experiment. Values of the line-shape parameters GAMMA, q, and rho2 and discrete oscillator strengths f for the 3p, 4p, and 5p resonances are reported

Peptide Bβ15-42 Preserves Endothelial Barrier Function in Shock

Loss of vascular barrier function causes leak of fluid and proteins into tissues, extensive leak leads to shock and death. Barriers are largely formed by endothelial cell-cell contacts built up by VE-cadherin and are under the control of RhoGTPases. Here we show that a natural plasmin digest product of fibrin, peptide Bß15-42 (also called FX06), significantly reduces vascular leak and mortality in animal models for Dengue shock syndrome. The ability of Bß15-42 to preserve endothelial barriers is confirmed in rats i.v.-injected with LPS. In endothelial cells, Bß15-42 prevents thrombin-induced stress fiber formation, myosin light chain phosphorylation and RhoA activation. The molecular key for the protective effect of Bß15-42 is the src kinase Fyn, which associates with VE-cadherin-containing junctions. Following exposure to Bß15-42 Fyn dissociates from VE-cadherin and associates with p190RhoGAP, a known antagonists of RhoA activation. The role of Fyn in transducing effects of Bß15-42 is confirmed in Fyn−/− mice, where the peptide is unable to reduce LPS-induced lung edema, whereas in wild type littermates the peptide significantly reduces leak. Our results demonstrate a novel function for Bß15-42. Formerly mainly considered as a degradation product occurring after fibrin inactivation, it has now to be considered as a signaling molecule. It stabilizes endothelial barriers and thus could be an attractive adjuvant in the treatment of shock

COMPRESSION TECHNIQUES FOR VIDEO TELEMETRY

International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, NevadaAs the role of television in the aerospace industry has expanded so has the need for video telemetry. In most cases it is important that the video signal be encrypted due to the sensitive nature of the data. Since this means that the signal must be transmitted in digital form, video compression technology must be employed to minimize the transmitted bit rate while maintaining the picture quality at an acceptable level. The basic compression technique which has been employed recently, with successful results, is a combination of Differential PCM and Variable Length coding (DPCM/VLC). This technique has been proposed to the Range Commanders Council to become a possible standard. The purpose of this paper is to compare the basic DPCM/VLC technique with alternative coding technologies. Alternative compression techniques which will be reviewed include Transform coding, Vector Quantization, and Bit Plane coding. All candidate techniques will be viewed as containing four elements -- signal conditioning, signal processing, quantization, and variable length coding. All four techniques will be evaluated and compared from the stand point of compression ratio and picture quality.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection