A study of machine-level software profile

The instruction mix of a CDC CYBER/74 computer in a university environment was monitored, and in this paper frequencies of execution for the most commonly used instructions are given. From these measurements we make a number of observations about several aspects of computing patterns. One observation is the fact that if we exclude the idle loop of the operating system, the percentage of occurrences for each type of instruction over various time intervals is constant. This fact is used to define a machine-level software profile (MLSP) for the type of machine operations in the given computing environment. It is shown that the MLSP could be used to find machine utilization and the extent to which software takes advantage of machine architecture, and as a consistent method to improve the performance of a machine configuration.     

Iontophoretically applied corticosteroids do not affect the firing of hippocampal neurons

In view of the possible role of the hippocampus in the neuroendocrine regulation of ACTH secretion, experiments were conducted in rats and cats in which cortisol (C) and corticosterone (CS) were applied by iontophoresis and pressure microinjection while recording from single identified pyramidal cells in the dorsal hippocampus, using multi-barrelled microelectrodes. None of the more than 500 cells tested responded with a significant change in firing rate. The possible relation of these findings to neuroendocrine regulation of ACTH secretion is discussed.     

Transcanalicular laser-assisted dacryocystorhinostomy

BACKGROUND AND OBJECTIVE: Current techniques of laser-assisted dacryocystorhinostomy are mostly endonasal. In this report, the authors describe their technique of laser-assisted dacryocystorhinostomy performed through the canaliculi and the surgical results they achieved. PATIENTS AND METHODS: Fourteen patients with nasolacrimal duct obstruction underwent transcanalicular laser-assisted dacryocystorhinostomy. The bony ostium was perforated using a fiber optic-transmitting, giant-pulse Nd:YAG laser, with an energy of 0.5 to 4 J per pulse. The total energy used to create an ostium was 18 to 34 J. A silicone tube was inserted through the canaliculi and the ostium into the nasal cavity and kept in place for 5 to 7 months. Patients were observed for 18 to 22 months. RESULTS: Nine of the 14 patients (64%) reported the disappearance of epiphora following surgery. In 3 patients, no relief of epiphora was obtained. In 1 patient the operation was not completed because of severe nasal bleeding. In another, tearing began 12 months after surgery (6 months after tube removal). CONCLUSIONS: Transcanalicular laser-assisted dacryocystorhinostomy is a potentially useful method for performing dacryocystorhinostomy. Technical modifications and improvements are needed to increase the success rate.     

Multidimensional perception of counselor behavior.

Investigated S. R. Strong's prediction of the existence of 3 dimensions of perceived counselor behavior: expertness, attractiveness, and trustworthiness. Films of interviews given by C. Rogers, A. Ellis, and F. Perls were watched by 202 Ss, who rated each counselor on 36 bipolar scales. Ratings were then factor-analyzed separately for each counselor. Results support the existence of the hypothesized dimensions for Rogers and Perls but only 2 dimensions for Ellis. Implications of results for counseling and further research are discussed. (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Condensation of 2-Aminofluorene with α, ω-Dibromoalkanes

N, N′-(2-fluorenyl) derivatives of piperazine, azetidine, pyrrolidine, piperidine and hexamethyleneimine are formed in the condensation of 2-aminofluorene with α,ω-dibromoalkanes in the presence of calcium hydroxide or sodium ethoxide. The same products have been prepared also by other routes.     

Acid-assisted consolidation of powder compacts: cold-welding or cold sintering

Silver powder that has been treated in dilute fluoroboric acid solution and compacted at room temperature displays surprisingly elevated flexural and even tensile strength. The density and mechanical strength values increase with increasing compaction pressure. The flexural strength and the elastic moduli of silver powder compacted at 1 GPa, as determined by sound velocity measurements, reach values comparable to those of bulk silver. The results can be tentatively interpreted either in terms of an ambient temperature self-soldering effect of silver in the presence of the fluoroboric acid, acting as a fluxing agent, or as cold liquid-phase sintering in an aqueous liquid medium.     

Aeration of fishponds by photovoltaic power

Fishponds in aquaculture farms are usually located in remote areas, far from grid supply lines. Aeration of ponds for growing aquatic animals (e.g., fish) is required to prevent mortality and to intensify production, especially when feeding is practical, and in warm regions. Aeration systems with photovoltaic power supply may be the appropriate technology from an ecological and economic point of view. In addition, photovoltaic power is very suitable for remote developing regions, owing to its simplicity and low maintenance. The purpose of the present study was to demonstrate an aeration system using a paddle wheel connected to a permanent magnet DC motor, and powered by a photovoltaic power supply. The study was carried out on the coastal area in the center of Israel. The aeration system operated satisfactorily for the demonstration period of more than two years. Copyright © 2001 John Wiley & Sons, Ltd.     

Teaching Building Information Modeling as an Integral Part of Freshman Year Civil Engineering Education

Lack of personnel with Building Information Modeling (BIM) skills is a significant constraint retarding use of the technology in the architecture, engineering, and construction industry. Unless BIM is introduced into undergraduate civil engineering curricula in a fundamental way, graduate civil engineers will lack the skills needed to serve a construction industry in which three-dimensional models are the main medium for expression and communication of design intent and the basis for engineering analysis. A mandatory freshman year course titled “Communicating Engineering Information,” which teaches both theoretical and practical aspects of BIM, has been developed to replace the traditional engineering graphics course at the Technion. The main lesson learned through four semesters of teaching the class is that students find BIM tools intuitive and therefore relatively easy to learn; the majority of lecture hours are now devoted to the conceptual aspects of BIM and the principles for preparing models that can be analyzed in multiple ways. BIM can and should be taught in its own right, and not as an extension to computer-aided drawing. The skills students have been able to bring to bear in design courses later in their university education indicate that the approach is sound and will enable graduates to meet the needs of the civil engineering profession in the “BIM age.”