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Homebrew 50 MHz Frequency Counter built in 1972. At the time, a 50Mhz counter was pretty advanced (at least to me). My own design, but functionally, it was similar to an HP 10MHz counter that used nixie displays. I think there are about 50 DIP chips, mostly 7400 TTL, on 8 PC boards. The largest board is about 4" x 12" with 21 DIPs (3 per decade), hidden in the base of the chassis. Today, this could be built with a few inexpensive chips, with much better performance. But, it still works, and I built it, so I use it... ;-)
Band press shots
Photography by James Pearson Howes (www.jamespearsonhowes.com)
Illustration by Jiro Bevis (www.jirobevis.co.uk)
Here my key-logger loses track of the keyboard during a channel hops. Solving this will require either a second radio or active transmissions, neither of which I find to be pleasant.
16p-006
March 1, 2016
Leco CS744 - Oxygen/Nitrogen by Inert Gas Fusion Infrared and Thermal Conductivity Detection
The Leco CS744 is designed for routine measurement of carbon and sulfur in primary steels, ores, finished metals, and other inorganic materials. Additional features—such as a high-frequency combustion furnace, improved IR cell design, rugged design, and available automation assists in acquiring an accurate analysis of carbon and/or sulfur.
Request by Peter Hsieh
National Energy Technology Laboratory - NETL-Albany, 1450 Queen Ave. SW, Albany, Oregon.
Reference by Peter Hsieh
Trace amounts of carbon, sulfur, nitrogen, and oxygen can make a big difference in the structure and properties of many alloys. Combustion analysis can be used to measure the concentration of carbon and sulfur in a number of different ores and metals. A small amount of the sample is first combusted in oxygen. The amount of carbon
dioxide and sulfur dioxide produced from the reaction is then measured with an infrared detector.
A similar approach is applied to measure the amount of nitrogen and oxygen present in each sample. The sample is placed inside a graphite crucible and heated rapidly. Oxygen present in the molten sample reacts readily with the graphite crucible, and the amount of carbon dioxide formed from the combustion reaction is measured with an infrared detector and used to calculate the amount of oxygen originally present in the sample. Nitrogen gas escaping from the molten sample is measured with a separate thermal conductivity detector, as it is invisible to the infrared detector.
By measuring the composition of alloys down to parts-per-million levels, it is possible to work out how changes to ingredients and processing conditions affect their composition.
Active Noise Cancellation:
- Small microphones pick up ambient low frequency noise; electronics generate opposite “anti-noise” sound waves-the result is peace
and quiet and less interference with music listening or movies even with it turned off.
Passive noise reduction:
- Dense, thick memory foam cups surround the entire ear. The result is greater comfort and significant reduction in ambient highfrequen cy noise.
Excellent stereo sound:
- SRS WOW digital techology significantly enhances the performance of the headphone speakers.
Improved speaker sensitivitly and greater power input deliver excellent audio quality.
Superior comfort:
- Memory foam over-ear cups with ergonomic “V” shape and 90° (degrees) flexibility are very comfortable, even during extended use.
- Ergonomic leather-covered headband is adjustable for custom comfort.
Traveler’s conveniences:
- Earcups swivel flat so the headphones fit securely into a slim protective travel case (included).
- Battery compartment door on one earcup convenienty slides open, without detaching.
- Five-foot cord is detachable for travel and storage.
Includes airline adapter plug.
The square root of frequency is pretty dark, but even it exaggerates how often the less used or less plausible routes are traveled.
From all available journeys recorded in pairs of Twitter geotags near the San Francisco Bay Area though October 21, 2011.
See similar Jaguar 6T-250 and Jupiter 6T-250 radios. This radio was made by the Fuji High Frequency Radio Lab Company, Ltd., circa 1961. This company also marketed radios under the Constant, Jaguar, Jupiter, Crestline, Windsor and Morse brands.
Professor Jim Angel speaking with a member of the audience about high frequency trading. For more information, please see the event page on Third Way's website at www.thirdway.org/events/116.
Ralph Alswang Photographer.www.ralphphoto.com.202-487-5025
An afternoon wonder around Flavigny-sur-Ozerain
Flavigny-sur-Ozerain is a commune in the French department of Côte-d'Or, in Bourgogne-Franche-Comté.
The village was awarded membership in Les Plus Beaux Villages de France ("France's most beautiful villages").
The medieval village of Flavigny is situated on a rocky spur, surrounded by three streams: the Ozerain, the Recluse and the Verpant.
The first written mention of the village of Flavigny was in the Latin form of its name, Flaviniacum, which appears in the cartulary (or charter) of the Benedictine abbey founded on the site by a certain Widerard in 719. In the mid-9th century, in response to the increasing frequency of Viking raids, the relics of Saint Reine (or Santa Regina) were removed from the nearby town of Alise to Flavigny in the hopes that they could be better protected in a more fortified setting. The relics remain in Flavigny to this day, although they travel back to Alise every fall for the celebration of the saint's feast day in early September.
The town was prosperous during the Middle Ages, catering to large numbers of pilgrims, both those who came to visit the relics of Saint Reine and those on their way to Santiago de Compostela. By the 10th century, the abbey had grown into a town, with a parish church dedicated to St. Genest in addition to the abbey church (dedicated to St Peter). During the 12th and 13th centuries, extensive fortifications were raised around the town; large portions of these walls still surround the village to this day, including the Porte du Val (which includes both an inner gate dating to the 13th century and a sixteenth-century outer gate), and the 15th century Porte du Bourg with its statue of the Virgin. Despite these fortifications, Flavigny was occupied by the English during the Hundred Years' War.
In 1632 the Ursuline convent of Flavigny was founded, and in the early 18th century a new residence for the Abbot of Flavigny was constructed. However, by that time the abbacy had become corrupt and was held by a layman who had little to do with the town. At the time of the French Revolution, there may have been as few as five monks in residence. The abbey church was probably already in ruins, although local tradition holds that it suffered damage at the hands of revolutionaries. The parish church, St. Genest, emerged from the Revolution more or less unharmed.
In the 21st century, Flavigny has fewer than 400 year-round residents, although this number increases in the summer due to the substantial number of foreigners (Swiss, American, Australian, German) who have summer homes in the village. The abbey now houses the factory which manufactures Les Anis de Flavigny, small aniseed-flavored pastilles distributed worldwide. Various artists and artisans make their homes in the village, and it has become a popular tourist destination.
Rue Franklin towards Rue de l'Ancienne Cure (on the left) and Grand Rue (straight ahead).