Deformation processes in forging ceramics Progress report, 19 Jun. - 19 Sep. 1969

Deformation processes involved in forging of polycrystalline oxide ceramic

Deformation processes in forging ceramics Progress report, 19 Dec. 1969 - 19 Mar. 1970

Deformation processes in forging ceramic

High temperature compounds for turbine vanes

Fabrication and microstructure control studies were conducted on SiC, Si3N and composites based on Si3N. Charpy mode impact testing to 2400 F established that Si3N4/Mo composites have excellent potential. Attempts to fabricate composites of Si3N4 with superalloys, both by hot pressing and infiltration were largely unsuccessful in comparison to using Mo, Re, and Ta which are less reactive. Modest improvements in impact strength were realized for monolithic Si3N4; however, SiC strengths increased by a factor of six and now equal values achieved for Si3N4. Correlations of impact strength with material properties are discussed. Reduced MgO densification aid additions to Si3N4 were found to decrease densification kinetics, increase final porosity, decrease room temperature bend strength, increase high temperature bend strength, and decrease bend stress rupture properties. The decrease in bend strength at high temperature for fine grain size SiC suggested that a slightly larger grain size material with a nearly constant strength-temperature relation may prove desirable in the creep and stress rupture mode

Comprehensive Spectral Analysis of Human EEG GENERATORS in Posterior Cerebral Regions

Human electroencephalogram generator spectral analysis in posterior cerebral region

Optical implementation of systolic array processing

Algorithms for matrix vector multiplication are implemented using acousto-optic cells for multiplication and input data transfer and using charge coupled devices detector arrays for accumulation and output of the results. No two dimensional matrix mask is required; matrix changes are implemented electronically. A system for multiplying a 50 component nonnegative real vector by a 50 by 50 nonnegative real matrix is described. Modifications for bipolar real and complex valued processing are possible, as are extensions to matrix-matrix multiplication and multiplication of a vector by multiple matrices

Buckling of Cold Formed Stainless Steel Columns under Concentric and Eccentric Loading

This paper describes the results obtained from a series of compression tests performed on cold formed stainless steel Type 304 columns of lipped channel cross-section. The cross-section dimensions, the column length and the eccentricity of the applied compressive load are varied to examine the effects on the buckling load capacity of the columns. The results obtained are compared to those obtained from the relevant design specifications in America and in Europe, and conclusions are drawn on the basis of the comparisons

Electroencephalographic baselines in astronaut candidates estimated by computation and pattern recognition techniques

Electroencephalographic baselines in astronaut candidates estimated by computer and pattern recognition technique

Solving the Procedural Puzzles of the Texas Heartbeat Act and Its Imitators: The Potential for Defensive Litigation

The Texas Heartbeat Act (SB8) prohibits abortions following detection of a fetal heartbeat, a constitutionally invalid ban under current Supreme Court precedent. But the law adopts a unique enforcement scheme—it prohibits enforcement by government officials in favor of private civil actions brought by “any person,” regardless of injury. Texas sought to burden reproductive-health providers and rights advocates with costly litigation and potentially crippling liability. In a series of articles, we explore how SB8’s exclusive reliance on private enforcement creates procedural and jurisdictional hurdles to challenging the law’s constitutional validity and obtaining judicial review. This piece explores defensive litigation, in which a rights-holder violates the law, gets sued (usually in state court), and raises the law’s constitutional invalidity as a defense, asking the court to dismiss the enforcement action. The article compares numerous similar situations in which constitutional rights must be litigated defensively. It then examines the processes through which SB8 challenges can be litigated defensively; these include how providers might trigger a lawsuit, the role of “friendly” plaintiffs in bringing suit, limitations on state standing, and how the case can reach the Supreme Court of the United States for final review

Vibrational relaxation measurements in CO2 USING an induced fluorescence technique

Vibrational relaxation measurements in carbon dioxide using induced infrared fluorescence techniqu