Canonical Objects in Classes of (n, V)-Groupoids

AMS Subj. Classification: 03C05, 08B20

Short term aerobic exercise training in young males does not alter sensitivity to a central serotonin agonist

An increase in the concentration of serotonin in the brain has been shown to cause fatigue during exercise in humans and experimental animals. This type of fatigue is referred to as central fatigue and is likely to be mediated by the concentration of serotonin as well as serotonin receptor sensitivity. Serotonin (5-HT) receptor antagonism in humans and experimental animals has been shown to improve endurance performance. A previous report has shown decreased receptor sensitivity in athletes compared to sedentary controls. It is unclear whether this is due to a training adaptation or if individuals are predisposed to enhanced athletic performance due to their inherent decreased receptor sensitivity. The present study investigated changes in 5-HT receptor sensitivity in response to aerobic exercise. Subjects completed 3 × 30 min of stationary cycling at 70% of their peak aerobic power (V̇O2,peak) for 9 weeks. Serotonin receptor sensitivity was assessed indirectly by measuring the neuroendocrine response following administration of a serotonin agonist (buspirone hydrochloride). The neuroendocrine response following administration of a placebo was also investigated in a blind crossover design. A group of sedentary control subjects was also recruited to control for seasonal variations in central receptor sensitivity. The training caused a significant increase in V̇O2,peak (3.1 ± 0.16 to 3.6 ± 0.15 l min−1, P < 0.05) and endurance capacity (93 ± 8 to 168 ± 11 min, P < 0.05), but there was no change (P > 0.05) in the neuroendocrine response in the presence of a serotonin agonist. However, one-quarter of the subjects in the training group demonstrated decreases in receptor sensitivity. These results suggest that despite increases in V̇O2,peak and endurance performance, there was no measurable change in 5-HT receptor sensitivity in the presence of a serotonin agonist. In addition, it is possible that changes in receptor sensitivity may take longer to occur, that the training stimulus used in the present investigation was inadequate and/or that changes occurred in receptor subtypes that were not probed by the agonist used in the present investigation.

AI automates substation control

An overview is given on the possibility of controlling the status of circuit breakers (CB) in a substations with the use of a knowledge base that relates some of the operation magnitudes, mixing status variables with time variables and fuzzy sets. It is shown that even when all the magnitudes to be controlled cannot be included in the analysis, it is possible to control the desired status while supervising some important magnitudes as the voltage, power factor, and harmonic distortion, as well as the present status.

Simulation of Dust Loaded V-I Characteristics of a Commercial Thermal Power Plant Precipitator

A new approach based on finite difference method, is proposed for the simulation of electrical conditions in a dc energized wire-duct electrostatic precipitator with and without dust loading. Simulated voltage-curren characteristics with and without dust loading were compared with the measured characteristics for analyzing the performance of a precipitator. The simple finite difference method gives sufficiently accurate results with reduced mesh size. The results for dust free simulation were validated with published experimental data. Further measurements were conducted at a thermal power plant in India and the results compares well with the measured ones.

Singular behaviour near the tip of a sharp V-notch in a power law hardening material

This paper presents an asymptotic analysis of the near-tip stress and strain fields of a sharp V-notch in a power law hardening material. First, the asymptotic solutions of the HRR type are obtained for the plane stress problem under symmetric loading. It is found that the angular distribution function of the radial stress sigma(r) presents rapid variation with the polar angle if the notch angle beta is smaller than a critical notch angle; otherwise, there is no such phenomena. Secondly, the asymptotic solutions are developed for antisymmetric loading in the cases of plane strain and plane stress. The accurate calculation results and the detailed comparisons are given as well. All results show that the singular exponent s is changeable for various combinations of loading condition and plane problem.

A 75-81 GHz, 14.3 dBm Peak Output Power, 21 dB Peak Gain, SiGe Power-Combining Amplifier Operating from a Single 3.3 V Supply

A compact differential 4-way power combiner with 2.3 dB loss and high common-mode rejection characteristic for use in mm-wave PAs is presented. A complete circuit comprised of a power splitter, two-stage cascode PA array, and a power combiner was implemented in SiGe technology. Measured small-signal gain of at least 17 dB was obtained from 74.5 GHz to 80.5 GHz with a peak 21 dB at 79 GHz. The prototype delivered 13.2 dBm P1dB and 14.3 dBm Psat when operated from a single 3.3 V supply at 75 GHz.

A Compact V-band power detector

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A compact V-band active power detector using Infineon 0.35 µm SiGe HBT process (fT/fmax =170/250 GHz) is described. The total chip area is only 0.35×0.8 mm2 including all pads. This design exhibits a dynamic range larger than 20 dB over the frequency range from 55 GHz to 67 GHz. It also offers a simple and low-power application potential as an envelop detector in multi-Gbps high data rate demodulators for OOK/ASK etc.

Alarmed, but not alert in the "war on terror"? The High Court, Thomas V Mowbray and the Defence Power

The article examines the judgment in Thomas v. Mowbray by the High Court in Australia handed down during the so called 'War on Terror'. According to the author, (i) the High Court de-emphasized the importance of the difference between war and peace in fixing the scope of the defence power in the Australian Constitution in a manner which was inconsistent with its earlier celebrated decision in the Communist Party Case in 1950 during the Cold War; and (ii) failed to apply a sufficiently rigorous test of proportionality in characterising the impugned Commonwealth laws. The article discuss the legal background and social implications of the High Court's decision, using the Communist Party Case in 1950 as a point of comparison.

Experimental essays on medical and philosophical subjects : particularly, I. On the fermentation of alimentary mixtures, and digestion of the food. II. On the nature and properties of fixed air. III. On the respective powers, and manner of acting, of the different kinds of antiseptics. IV. On the scurvy ; with a proposal for trying new methods to prevent or cure the same, at sea. V. On the dissolvent power of quick-lime ; and a further investigation of the properties of fixed air /

Mode of access: Internet.

Operator's manual : welding machine, ARC, generator, diesel driven, single operator, remote control, 300 AMP, DC ARC, skid MTD, 60 AMP 20 V MIN, 375 AMP AT 40 V MAX, current 115 V 3 KW auxiliary power (Libby model ODW-300) FSN 3431-894-1573.

"August 1962."

Field and depot maintenance manual : generator set, diesel engine precise power; 100 KW, AC, 120/208 V, 240/416 V, 3 phase, 60 cycle at 1800 RPM, 83.3 KW, 120/208 V 240/416 V, 3 phase, 50 cycle at 1500 RPM; skid mounted (Detroit Diesel Divn. General Motors Corp. model 6910A) FSN 6115-798-3444.

Includes index.

Organizational maintenance repair parts and special tools lists : power plant, electric, diesel engine, skid mounted, 3 unit, 1500 kw, 4160 V, 60 Hertz (A.G. Schoonmaker model SM500-6800-3) FSN 6115-250-4404, 4 unit, 2000 kw, 4160 V, 60 Hertz ....

"June 1971."

Direct and general support and depot maintenance repair parts and special tools lists : power plant, electric, diesel engine, skid mounted, 3 unit, 1500 kw, 4160 V, 60 hertz (A.G. Schoonmaker model SM500-6800-3) FSN 6115-250-4404, 4 unit, 2000 kw, 4160 V, 60 hertz ....

"June 1971."