From soliver at nrao.edu Mon Feb 2 17:17:44 2004 From: soliver at nrao.edu (Stacy Oliver) Date: Mon, 2 Feb 2004 15:17:44 -0700 Subject: [alma_na] [almanews] Correction for ALMA Memo 482 Released Message-ID: <007601c3e9da$61f8e630$8edbc5ce@MOONSHINE> ALMA MEMO #482 An Analysis on the Effect of Dual Wavelength Polarization Alignment on the Accuracy of Recovered Beat Note Phase R.Scott National Radio Astronomy Observatory 2004-02-02 LO Reference Line Length Correction Status Report (BEND-50.03.10.00-003-A-REP) included an analysis of the phase and amplitude due to the beating of two elliptically polarized light beams. In this report, the problem will be re-examined and analyzed in a more generalized way. The result will be used to investigate the sensitivity of the phase of the beat note response to mismatches of the polarization states of the two incident light beams. The results will show accurate beat note phase can be recovered when the polarization states of the two light beams satisfy a specific mathematical relation between the polarization states at the point the two light beams are combined onto a single fiber. For systems with potentially depolarizing components, the condition is more stringent; the polarization states of the two light beams must be exactly matched when the two light beams are combined. ALMA Memo 482 has been revised as of February 02, 2004. The revision was made in order to correct a grammatical error. To view or downloaded the revised version, please use the following link: http://www.alma.nrao.edu/memos/html-memos/alma482/memo482-1.pdf Original version of the document is available through the following link: http://www.alma.nrao.edu/memos/html-memos/alma482/memo482.pdf _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From soliver at nrao.edu Wed Feb 4 17:47:34 2004 From: soliver at nrao.edu (Stacy Oliver) Date: Wed, 4 Feb 2004 15:47:34 -0700 Subject: [alma_na] [almanews] ALMA Memo 486 Released Message-ID: <000201c3eb70$e1e43600$8edbc5ce@MOONSHINE> ALMA MEMO #486 Characteristics Of Lightning Discharges Over AOS T. Watanabe (Gifu University), N. Takagi (Gifu University), D. Wang (Gifu University), L. Liu (Gifu University), M. Kamata (Gifu University), S. Sakamoto (NAOJ) 2004-02-04 Lightning discharges over the Array Operations Site (AOS) were measured with electromagnetic field antennas. A total of 107 lightning discharges recorded in summers of 2002-2003 were statistically analyzed. Although thunderstorms over the AOS are rare, once occurred, strong lightning activity with a lightning frequency of 1.6 flashes per minute and the cloud-to-ground discharge percentage of about 66%, both comparable to summer lightning at lower altitudes was observed. Among cloud-to-ground discharges, about 7% were positive cloud-to-ground discharges that often neutralize large amount of charges. The number of strokes per flash of the cloud-to-ground discharges was very large, with a maximum value of 24 and a median value of 8. The median value of the inter-stroke time interval was very short (25 ms), suggesting shorter distance to the thunderstorm charges. The continuous current component that neutralizes large amount of charges were observed in 39% of the cloud-to-ground discharges, and the median value of the continuous current duration was long (140 ms) and was comparable to that of typical summer lightning at lower altitudes. View a pdf version of ALMA Memo #486. http://www.alma.nrao.edu/memos/html-memos/alma486/memo486.pdf _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From jbauer at nrao.edu Thu Feb 5 14:20:50 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Thu, 5 Feb 2004 14:20:50 -0500 Subject: [alma_na] Next NA DH Teleconference Message-ID: <001e01c3ec1d$2a983250$bb7521c0@cv.nrao.edu> Everyone, The next NA DH Teleconference is on Monday, 9th February beginning at 1:00 pm ET, 1800 UTC time. Dial in information is below. Feb 9 1 p.m. ET 1800 UTC ALMA NA DH Meeting Calendar: multiple cals Audio/Video/Both/Local: Audio (434-295-1363) Details: CVOIC/SOC280/TUCN505 Please let me know if you cannot attend. Thanks, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: From soliver at NRAO.EDU Tue Feb 10 16:15:07 2004 From: soliver at NRAO.EDU (Stacy Oliver) Date: Tue, 10 Feb 2004 14:15:07 -0700 Subject: [alma_na] [almanews] ALMA Memo 480 Released Message-ID: <011901c3f01a$f8454110$2802a8c0@radler> ALMA MEMO #480 Thermal Properties of subsurface layer at Pampa La Bola Seiichi Sakamoto (NAOJ) and Hideharu Ishizaki (NAOJ) 2004/02/06 Keywords: site testing, soils, subsurface temperature, thermal diffusivity, frost heaving We monitored subsurface temperature for more than 2 years at Pampa La Bola every 20 cm down to 100 cm, and evaluated hourly temperature change, apparent thermal diffusivity, freezing points, and depth of frost line. Hourly temperature changes at 0-40 cm are dominated by diurnal cycle, whereas longer timescale variation takes over at deeper layer. Annual temperature range remains 9degC peak-to-peak even at the depth of 80 cm. The hourly temperature change at 80 cm and deeper remains at a level of ~ 0.005degC hr-1, and is mostly attributed to the annual cycle and practically cannot be overcome simply by digging deeper trenches. The apparent thermal diffusivity estimated from amplitude suppression of diurnal temperature change between 0 and 60 cm was smaller than 5.3 * 10^{-7} m2 s-1 for more than 75% of time, with the median value of 4.6 * 10^{-7} m2 s-1. A significant seasonal variation was found, with higher values (up to ~ 10 * 10^{-7} m2 s-1) during rainy summer, and with very low values (~ 2 * 10^{-7} m2 s-1) in autumn and spring when freezing-thawing transition layer appears near the surface. The freezing point deduced from statistical plots was -0.2degC, and can be explained with 0.3% salinity. Annual mean subsurface temperature was higher than freezing point with slight increasing trend as a function of depth, and no permafrost will exist in the plateau. Depth of frost line is approximately 1 m at Pampa La Bola, and is estimated to be 2 m or more at Llano de Chajnantor because of lower mean temperature. View a pdf version of ALMA Memo #480. http://www.alma.nrao.edu/memos/html-memos/alma480/memo480.pdf -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Wed Feb 11 10:30:29 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Wed, 11 Feb 2004 10:30:29 -0500 Subject: [alma_na] ALMA Weekly Progress Report 6th February 2004 Message-ID: <000501c3f0b3$fadf0d40$bb7521c0@cv.nrao.edu> Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: ALMA Weekly Progress Report 6th February 2004.txt URL: From jbauer at nrao.edu Thu Feb 12 11:14:14 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Thu, 12 Feb 2004 11:14:14 -0500 Subject: [alma_na] Back End CDR Message-ID: <002a01c3f183$42247080$bb7521c0@cv.nrao.edu> The Review Panel for the BE CDR has been finalized. Those wishing to attend as Observers should contact Clint Janes by 27 February to assure time for JAO approval. Alain Baudry will disseminate reservation and travel information in March to those attendees approved by JAO. Observers are welcome, but travel costs for Observers will not be paid by the BE IPT. The CDR plan is described at EDM BE Workspace/meetings/CDR, http://almaedm.tuc.nrao.edu/forums/alma/dispatch.cgi/backendmeetings/sho wFile/100164/ d20040212145752/No/BE%20IPT%20Critical%20Design%20Review%20Plan12.pdf Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Fri Feb 20 08:52:50 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Fri, 20 Feb 2004 08:52:50 -0500 Subject: [alma_na] ALMA NA DH Telecon on Monday, 23rd February Message-ID: <000001c3f7b8$d4471fe0$bb7521c0@cv.nrao.edu> The next NA DH Teleconference is on Monday, 23rd February beginning at 1:00 pm ET. Dial in information is below. Feb 23 1 p.m. - 2:30 p.m. ET ALMA NA DH Meeting Calendar: multiple cals Audio/Video/Both/Local: Audio (434-295-1363 Details: CVOIC/SOC317/TUC505 Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Fri Feb 20 09:02:18 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Fri, 20 Feb 2004 09:02:18 -0500 Subject: [alma_na] October-November 2003 NSF BImonthly Report is attached Message-ID: <000701c3f7ba$26ed00b0$bb7521c0@cv.nrao.edu> Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: NSF BIMONTHLY REPORT Oct-Nov 2003 Complete.pdf Type: application/pdf Size: 340284 bytes Desc: not available URL: From jbolyard at nrao.edu Wed Feb 25 14:16:04 2004 From: jbolyard at nrao.edu (Jody Bolyard) Date: Wed, 25 Feb 2004 14:16:04 -0500 Subject: [Alma_na] High Altitude Physicals References: <000001c3f7b8$d4471fe0$bb7521c0@cv.nrao.edu> Message-ID: <403CF474.8000709@nrao.edu> All, We are trying to ensure every NRAO employee going to the high site at the ALMA project in Chile is adequately protected from the effects of working at altitude. Toward that end, several of you will be receiving notices of the need to renew your high altitude physical prior to your next visit to the AOS. Additionally, I am using this message to advise all NRAO ALMA travelers to the site of the requirement to obtain proper medical certification prior to ascent. If you have never obtained the physical, please look at the HR web page for the proper forms. (http://www.nrao.edu/administration/fiscal_office/HighAltitudeMemo.pdf and http://www.nrao.edu/administration/fiscal_office/HighAltitudeForms.pdf). The following is a complete listing of ALL NRAO employees that have a medical clearance on record. If you have had an exam and your name is not on this listing, please forward the release to my attention and we will put you on the recall notification. Important note: This is a self reporting requirement designed to provide you with an assurance that you will encounter no adverse health effects at the high site. Please do not bypass this important exam. Thanks, Jody Records on file(complete listing) Abeyta, Leon Beaudet, Carla Bolyard, Jody Butler, Bryan Cotton, William Delgado, Juan M. Delgado, Pedro Donoso, Eduardo Emerson, Darrel Gasho, Victor Glendenning, Brian Groppi, Christopher Hardy, Eduardo Holdaway, Mark Mangum, Jeff Miller, Theodore A. Myers, Steve Napier, Peter Owen, Frazer Radford, Simon Rafal, Marc Shillue, William Simon, Richard Sramek, Dick Vanden Bout, Paul Watts, Galen Wootten, Al -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Wed Feb 25 16:02:21 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Wed, 25 Feb 2004 16:02:21 -0500 Subject: [Alma_na] minutes from NA DH Meeting are attached Message-ID: <001a01c3fbe2$a9025970$bb7521c0@cv.nrao.edu> Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: Meeting Minutes.doc Type: application/msword Size: 41984 bytes Desc: not available URL: From jbauer at nrao.edu Wed Feb 25 16:14:39 2004 From: jbauer at nrao.edu (Janet Bauer) Date: Wed, 25 Feb 2004 16:14:39 -0500 Subject: [Alma_na] New title for Mailing List Message-ID: <002701c3fbe4$60f9ba40$bb7521c0@cv.nrao.edu> Everyone, Please note that the alma_us at nrao.edu mailing list has been renamed alma_na at nrao.edu. There seemed to be some confusion with alma_usstaff which is the entire US Staff member list and this new name also better reflects our Canadian members on the list. Anything sent to alma_us will be automatically forwarded to alma_na for the next three weeks. After that time, alma_us will be deleted. Please make a note of this change for your files. Thanks, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0255 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: