A new circuit topology for continuous group delay synthesis

A new circuit topology is realized in order to synthesize group delay continuously. The circuit is based upon a new variable coupling coefficient coupled line section and a microstrip feedback loop. The new variable coupler is designed by periodically loading an edge coupled microstrip coupler. With this new design, coupling variation of more than 10 dB may be achieved. To the best of the authors knowledge, this is the first report of this type of microstrip coupler. The complete circuit consumes no do power and exhibits more than 500 ps of continuous variable true time delay. Insertion loss is better than 3 dB and return loss is better than 15 dB     

An Ultrasound Moving Target Indicator System for Diagnostic Use

An ultrasound system using moving target indicator (MTI) techniques has been developed to provide a different approach to the problem of isolating and presenting echo information arising from dynamic tissue interfaces. The basic MTI procedure accomplishes isolation of moving target information by comparing echo information subsequent to a transmit pulse to the echo information arising from the preceding pulse. Stationary target information is effectively eliminated. In addition, the MTI procedure isolates dynamic target information throughout the volume investigated by the ultrasonic transducer. This feature eliminates the need for rangegating.     

Span of apprehension and arousal in schizophrenia.

Investigated the relationship between levels of somatic arousal, autonomic reactivity, and visual information processing in 32 schizophrenic and 16 normal Ss. Span of apprehension for tachistoscopically presented consonants was measured over 80 trials and skin conductance level (SCL) and heart rate (HR) were monitored during rest and performance. An information-processing deficiency in the schizophrenic Ss was interpreted as related to perceptual rather than mnemonic factors. Individual differences in level of arousal (SCL and HR) were not systematically related to information-processing efficiency in schizophrenic or normal Ss. Correlations between span and change in arousal level suggested that autonomic flexibility enhanced information-processing efficiency in both groups. Amplitude of stimulus-specific autonomic reactivity in normal Ss was more specifically modulated to the attention response demands of the task. (28 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of hydrogen peroxide on lipoproteins and associated lipids

Lipoproteins isolated from human or chimpanzee serum were treated with H₂O₂ and allowed to stand varying lengths of time before quantitative analysis in the ultracentrifuge. Marked instability of ultracentrifugal boundaries (convection) occurred during the first 24 hr, but diminished thereafter. Simultaneously, the quantity of lipoprotein decreased. The instability of boundaries in H₂O₂-treated samples was presumed to reflect loss of lipid-protein affinity and breakdown of lipoproteins under the force of ultracentrifugation. Analysis of extracted lipids showed that H₂O₂ caused little loss of phospholipid, significant loss of triglyceride, and apparent loss of cholesteryl ester. The latter loss, however, was accompanied by appearance of esterified cholesterol in the free cholesterol eluent. Apparently H₂O₂ converted some cholesteryl esters to a more polar form which was eluted later from the column, with the free cholesterol fraction. Gas chromatographic analysis of the fractions eluted from the column showed that selective degradation of polyunsaturated fatty acids was most marked with cholesteryl esters, somewhat less with triglycerides, and negligible with phospholipids. It was postulated that the loss of lipid-protein affinity caused by H₂O₂ in vitro may reflect a similar process in vivo, i.e., that one process contributing to development of atherosclerosis can be oxidation of lipoprotein, with loss of lipid-protein affinity and accumulation of lipid products in (or on) cells of the vascular system. Presented at the AOCS Meeting, Washington, D. C., April, 1968.     

The forensic psychology section in a state hospital.

A psychology section functioning in a forensic services center is described. The legal questions that must be dealt with in such a setting are explained, and psychology's role in answering these questions is explored. The goals of treatment in a forensic unit, which focus on educating a defendant to competency for trial, are discussed, and an example of a treatment program is presented. The functions of a psychologist in a forensic setting are compared and contrasted with those of a psychologist in the general mental health field. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ink Processing for Thermoelectric Materials and Power‐Generating Devices

The growing concern over the depletion of hydrocarbon resources, and the adverse environmental effects associated with their use, has increased the demand for renewable energy sources. Thermoelectric (TE) power generation from waste heat has emerged as a renewable energy source that does not generate any pollutants. Recently, ink‐based processing for the preparation of TE materials has attracted tremendous attention because of the simplicity in design of power generators and the possibility of cost‐effective manufacturing. In this progress report, recent advances in the development of TE inks, processing techniques, and ink‐fabricated devices are reviewed. A summary of typical formulations of TE materials as inks is included, as well as a discussion on various ink‐based fabrication methods, with several examples of newly designed devices fabricated using these techniques. Finally, the prospects of this field with respect to the industrialization of TE power generation technology are presented.     

DoS detections based on association rules and frequent itemsets

To detect the DoS in networks by applying association rules mining techniques, we propose that association rules and frequent itemsets can be employed to find DoS pattern in packet streams which describe traffic and user behaviors. The method extracts information from the log analysis of submitted packets using the algo- rithm which depends on the definition of the intrusion. Large itemsets were extracted to represent the super facts to build the association analysis for the intrusion. Network data files were analysed for experiments. The analysis and experimental results are encouraging with better performance as packet frequency number increases.     

Preparation,analysis, and isothermal crystallization behavior of poly[1,3‐bis(aminomethyl)cyclohexamethylene oxamide]

Poly[1,3‐bis(aminomethyl)cyclohexaneoxamide] (PBAC2) was synthesized using 1,3‐bis(aminomethyl)cyclohexane (BAC) and dibutyl oxalate (DO) via spray/solid‐state polycondensation (SSP). The structure of the synthesized polyoxamide was confirmed by ¹H‐nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy. The weight average molecular weight (M_w) of the polyoxamides prepared was 1.35 × 10⁵. The polyoxamides showed excellent thermal properties with glass transition temperature (T_g) of 150 °C, melting temperature (T_m) of 318 °C, crystallization temperature(T_c) of 253 °C, and initial degradation temperature (T_d) of 417 °C suggesting higher thermal stability than commercial polyamide 6 (T_d = 378 °C). Kinetic studies of PBAC2 predicted a two‐dimensional crystal growth. X‐ray diffraction powder diffraction suggested that the polymer has high crystallinity. A saturated water absorption of 2.8 wt % was recorded for the new polyoxamide, giving it a competitive edge for applications in civil aviation, reinforced plastics, and electronics industry where precise dimensional stability and high thermal resistance properties are a priority. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46345.