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Chemical and Meteorological Influences on the Lifetime of NO3 at a Semi- Rural Mountain Site During “PARADE” N
Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-38, 2016 Manuscript under review for journal Atmos. Chem. Phys. Published: 22 January 2016 c Author(s) 2016. CC-BY 3.0 License. Chemical and meteorological influences on the lifetime of NO3 at a semi- rural mountain site during “PARADE” N. Sobanski1, M.J. Tang1,5, J. Thieser1, G. Schuster1, D. Pöhler2, H. Fischer1, W. Song1, C. Sauvage1, J. Williams1, J. Fachinger3, F. Berkes4,6, P. Hoor4, U. Platt2, J. Lelieveld1 and J.N. Crowley1 5 1 Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Mainz, Germany. 2 Institute of Environmental Physics, University of Heidelberg, Germany. 3 Max-Planck-Institut für Chemie, Division of Particle Chemistry, Mainz, Germany. 4 Institut For Atmospheric Physics, Johannes Gutenberg-University Mainz, Germany. 10 5 Present affiliation: Chemistry Department, University of Iowa, Iowa, USA. 6 Present affiliation: Institute of Energy and Climate, Forschungszentrum Jülich, Jülich, Germany. Correspondence to: J. N. Crowley ([email protected]) Abstract. Through measurements of NO2, O3, and NO3 during the PARADE campaign (PArticles and RAdicals, Diel 15 observations of mEchanisms of oxidation) in the German Taunus mountains we derive nighttime, steady state lifetimes (τss) of NO3 and N2O5. During some nights, high NO3 (~200 pptv) and N2O5 (~1 ppbv) mixing ratios are associated with values of τss that exceeded one hour for NO3 and three hours for N2O5 near the ground. Such long boundary layer lifetimes for NO3 and N2O5 are usually only encountered in very clean/unreactive air masses whereas the PARADE measurement site is impacted by both biogenic emissions from the surrounding forest and anthropogenic emissions from the nearby 20 urbanized/industrialised centres. -
Peer-Assisted Video Streaming with RTMFP Flash Player: a Measurement Study on PPTV Shan Zou, Student Member, IEEE, Qiang Wang, Junqiang Ge, and Ye Tian, Member, IEEE
1 Peer-assisted Video Streaming with RTMFP Flash Player: A Measurement Study on PPTV Shan Zou, Student Member, IEEE, Qiang Wang, Junqiang Ge, and Ye Tian, Member, IEEE Abstract—RTMFP is a protocol developed by Adobe for TABLE I multimedia delivery under both client-server and peer-to-peer ARCHITECTURES AND STREAMING PROTOCOLS OF POPULAR VIDEO paradigms. Currently, major Internet video service providers SERVICE PROVIDERS IN CHINA such as PPTV and iQIYI have already built their web-based video streaming systems with RTMFP. In such a system, user Service provider Architecture Streaming protocol Youku CDN HTTP only needs to install a Flash Player plug-in on his web browser, CNTV P2P UDP based proprietary protocol and can stream videos in a peer-assisted way. Tudou CDN HTTP Despite its wide usage, RTMFP has received little attention PPTV CDN + P2P HTTP + RTMFP from the measurement community. In this paper, we select iQIYI CDN + P2P HTTP + RTMFP PPTV as an example, and study the RTMFP video stream- Sohu TV CDN + P2P HTTP + RTMFP ing technology with a measurement approach. We reveal the architecture of PPTV’s RTMFP streaming system, and show that comparing with proprietary P2P networks, the RTMFP network has a different content distribution policy, and exhibits CNTV and Xunlei Kankan [6]. A problem of this approach different features on peers’ streaming behaviors, potential system is that users may not be willing to install many different bottleneck, and network dynamics. We also study RTMFP’s video proprietary plug-ins from different providers. -
Ilia Engineer 1971 16Th Anniversary Issue
Vol 17 No 1 Jun Jul _Ilia Engineer 1971 16th Anniversary Issue www.americanradiohistory.com RCA Engineer Staff W. O. Hadlock Editor J. C. Phillips Associate Editor Relax, John Q. Let's talk this over Miss Diane Juchno Editorial Secretary Joan P. Dunn Design and Layout rsary issu priate to Mrs. Julianne Clifton pay tribute to you, the reader -contributor. Supported by your Editorial Representative Subscriptions and the Technical Publications editorial staff, you have made this publication uniq Consulting Editors in its class. Outstanding both in the variety and the quality of its content, the RC Engineer is a major forum for communication among members of the RCA profes- C. A. Meyer Technical Publications Adm., sional community. Electronic Components C. W. Sall Technical Publications Adm., It is appropriate too, in these perplexing times, to give thought to another area of Laboratories communication; one which the RCA Engineer as an internal publication does not ,Strobl Technical Publications Adm. address directly. I refer to the need for each of us in the technical community to Corporate Engineering Services help put the layman at ease with technology so he can make informed decisions about its use. Editorial Advisory Board In recent months this need has been starkly and, in a way, brutally highlighted. The P. A. Beeby VP, Technical Operations. spectacular successes of the space program, which displayed unprecedented tech Systems Development Division, Computer Systems cal virtuosity, drew responses from the public ranging from disbelief to near adulation. Almost simultaneously, engineers and scientists were shocked to find themselves J. J. Brant Staff VP, Industrial Relations-International and their disciplines held responsible for the great social concerns of our time. -
Computer Networking a Top-Down Approach 6Th Edition
602 CHAPTER 7 • MULTIMEDIA NETWORKING 7.2.4 Content Distribution Networks Today, many Internet video companies are distributing on-demand multi-Mbps streams to millions of users on a daily basis. YouTube, for example, with a library of hundreds of millions of videos, distributes hundreds of millions of video streams to users around the world every day [Ding 2011]. Streaming all this traffic to loca- tions all over the world while providing continuous playout and high interactivity is clearly a challenging task. For an Internet video company, perhaps the most straightforward approach to providing streaming video service is to build a single massive data center, store all of its videos in the data center, and stream the videos directly from the data center to clients worldwide. But there are three major problems with this approach. First, if the client is far from the data center, server-to-client packets will cross many com- munication links and likely pass through many ISPs, with some of the ISPs possibly located on different continents. If one of these links provides a throughput that is less than the video consumption rate, the end-to-end throughput will also be below the consumption rate, resulting in annoying freezing delays for the user. (Recall from Chapter 1 that the end-to-end throughput of a stream is governed by the throughput in the bottleneck link.) The likelihood of this happening increases as the number of links in the end-to-end path increases. A second drawback is that a popu- lar video will likely be sent many times over the same communication links. -
Vibrational Substructure in the OH Stretching Transition of Water and HOD
9054 J. Phys. Chem. A 2004, 108, 9054-9063 Vibrational Substructure in the OH Stretching Transition of Water and HOD Zhaohui Wang, Andrei Pakoulev, Yoonsoo Pang, and Dana D. Dlott* School of Chemical Sciences, UniVersity of Illinois at Urbana-Champaign, 600 South Mathews AVenue, Urbana, Illinois 61801 ReceiVed: April 2, 2004; In Final Form: August 13, 2004 Ultrafast nonlinear vibrational spectroscopy with mid-IR pumping and incoherent anti-Stokes Raman probing is used to study V)1 excitations of OH stretching (νOH) of water and of HOD in D2O solvent (HOD/D2O). The parent νOH decay and the appearance of daughter stretching and bending excitations are simultaneously monitored, which allows for characterization of the stretch decay pathways. At all times and with all pump frequencies within the νOH band, the excited-state spectrum can be fit by two overlapping subbands, a broader R B red-shifted band νOH and a narrower blue-shifted band νOH. We show these subbands are dynamically distinguishable. They decay with different lifetimes and evidence characteristically different decay pathways. R B ∼ Excitations of the νOH subband generate bending vibrations that νOH does not. The shorter lifetime ( 0.5 ps) R B - of the νOH subband compared to the νOH subband (0.8 0.9 ps) results primarily from enhanced stretch-to- bend anharmonic coupling. The subbands represent persistent structures in the excited state, in that interconversion between subbands (2-10 ps) is slower than excited-state decay. A tentative structural R interpretation is proposed. The νOH subband, on the basis of simulations, its red shift ,and its shorter lifetime, R is proposed to result from strongly hydrogen-bonded “ice-like” water. -
Reason for Removal of Companies from Sample
Schedule D-6 Part 12 Page 1 of 966 Number of Companies Sheet Name Beginning Ending Reason for Removal of Companies from Sample US Screen 2585 2283 Removed all companies incorporated outside of the US Equity Screen 2283 476 Removed all companies with 2007 common equity of less than $100 million, and all companies with missing or negative common equity in Market Screen 476 458 Removed all companies with less than 60 months of market data Dividend Screen 458 298 Removed all companies with no dividend payment in any quarter of any year Trading Screen 298 297 Removed all companies whose 2007 trading volume to shares outstanding percentage was less than 5% Rating Screen 297 238 Removed all companies with non-investment grade rating from S&P, and removed all companies with a Value Line Safety Rank of 4 or 5 Beta Screen 238 91 Removed all companies with Value Line Betas of 1 or more ROE Screen 91 81 Removed those companies whose average 1996-2007 ROE was outside a range of 1 std. deviation from the average Final Set 81 81 DivQtr04-08 data on quarterly dividend payouts MktHistory data on monthly price closes Trading Volume data on 2007 trading volume and shares outstanding S&P Debt Rating data on S&P debt ratings CEQ% data on 2006 and 2007 common equity ratios ROE data on ROE for 1996-2007 ROE Check calculation for ROE Screen Schedule D-6 Part 12 Page 2 of 966 any year 1991 through 2007 Schedule D-6 Part 12 Page 3 of 966 GICS Country of Economic Incorporati Company Name Ticker SymbSector on 1‐800‐FLOWERS.COM FLWS 25 0 3CI COMPLETE COMPLIANCE CORP TCCC 20 0 3D SYSTEMS CORP TDSC 20 0 3M CO MMM 20 0 4KIDS ENTERTAINMENT INC KDE 25 0 800 TRAVEL SYSTEMS INC IFLYQ 25 0 99 CENTS ONLY STORES NDN 25 0 A. -
Stories for a Global Audience
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Plenary Oral Presentations Children Aged 348 Months with Gastroenteritis Were Enrolled in Six Canadian Pediatric Emergency Departments
2018 Scientific Abstracts Abbreviations: B. Lee, MD, X. Pang, PhD, L. Chui, PhD, D. Schnadower, MD, PL = Plenary; LO = Lightning oral; MP = Moderated poster; MPH, J. Xie, MD, MPH, M. Gorelick, MD, MSCE, S. Schuh, MD, P = Poster University of Calgary, Calgary, AB *Corresponding authors are underlined. Introduction: Gastroenteritis accounts for 1.7 million emergency department visits by children annually in the United States. We conducted a double-blind trial to determine whether twice daily pro- biotic administration for 5 days, improves outcomes. Methods: 886 Plenary Oral Presentations children aged 348 months with gastroenteritis were enrolled in six Canadian pediatric emergency departments. Participants were randomly assigned to twice daily Lactobacillus rhamnosus R0011 and Lacto- PL01 bacillus helveticus R0052, 4.0 x 109 CFU, in a 95:5 ratio or placebo. Multicentre before-after implementation study of the Ottawa Primary outcome was development of moderate-severe disease within subarachnoid hemorrhage strategy 14 days of randomization defined by a Modified Vesikari Scale score 9. J. J. Perry, MD, MSc, M. L.A. Sivilotti, MD, MSc, M. Emond, MD, MSc, Secondary outcomes included duration of diarrhea and vomiting, C. M. Hohl, MD, MHSc, H. Lesiuk, MD, J. Sutherland, MEd, M. Khan, subsequent physician visits and adverse events. Results: Moderate- MSc,K.Abdulaziz,MSc,G.A.Wells,PhD,I.G.Stiell,MD,MSc, severe disease occurred in 108 (26.1%) participants administered pro- University of Ottawa, Department of Emergency Medicine, Ottawa, ON biotics and 102 (24.7%) participants allocated to placebo (OR 1.06; 95% CI: 0.77, 1.46; P = 0.72). After adjustment for site, age, and frequency Introduction: The Ottawa SAH Rule was developed to identify patients at of vomiting and diarrhea, treatment assignment did not predict high-risk for subarachnoid hemorrhage (SAH) who require investigations moderate-severe disease (OR, 1.11, 95% CI, 0.80 to 1.56; P = 0.53). -
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Acetone Variability in the Upper Troposphere: Analysis of CARIBIC Observations and Lmdz-INCA Chemistry-Climate Model Simulations
Atmos. Chem. Phys., 11, 8053–8074, 2011 www.atmos-chem-phys.net/11/8053/2011/ Atmospheric doi:10.5194/acp-11-8053-2011 Chemistry © Author(s) 2011. CC Attribution 3.0 License. and Physics Acetone variability in the upper troposphere: analysis of CARIBIC observations and LMDz-INCA chemistry-climate model simulations T. Elias1,*,**, S. Szopa1, A. Zahn3, T. Schuck2, C. Brenninkmeijer2, D. Sprung3, and F. Slemr2 1Laboratoire des Sciences du Climat et de l’Environnement/CEA-CNRS-UVSQ-IPSL, UMR8212, L’Orme des Merisiers, 91191 Gif-sur-Yvette, France 2Atmospheric Chemistry Division, Max Planck Institute for Chemistry, Mainz, Germany 3Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Germany *now at: HYGEOS, Euratechnolgies, 165, Avenue de Bretagne, 59000 Lille, France **now at: Honorary research associate at CRG, GAES, University of the Witwatersrand, Johannesburg, South Africa Received: 22 December 2010 – Published in Atmos. Chem. Phys. Discuss.: 17 March 2011 Revised: 10 July 2011 – Accepted: 19 July 2011 – Published: 8 August 2011 Abstract. This paper investigates the acetone variabil- acetone volume mixing ration (vmr) may vary in summer ity in the upper troposphere (UT) as sampled during the by more than 1000 pptv within only 5 latitude-longitude de- CARIBIC airborne experiment and simulated by the LMDz- grees; (4) the standard deviation for measurements acquired INCA global chemistry climate model. The aim is to (1) de- during a short flight sequence over a sub-region may reach scribe spatial distribution and temporal variability of acetone; 40 %. Temporal variability is also important: (1) the ace- (2) propose benchmarks deduced from the observed data set; tone volume mixing ratio (vmr) in the UT varies with the and (3) investigate the representativeness of the observational season, increasing from winter to summer by a factor 2 to data set. -
A Note from the Co-Chairs 2 10 18 23 31 37
Issue No. 37 November 2007 of the International Global Atmospheric Chemistry Project A Note from the A Note from the IGAC Co-chairs: Co-Chairs Phil Rasch and Kathy Law This issue of the newsletter will acquaint our readers with many of the "mobile platforms" being used to produce systematic, high The CARIBIC aircraft quality, and routine in-situ measurements of atmospheric trace 2 system for detailed, long-term, global-scale constituents. It is a logical extension to a theme begun in our measurement of trace previous issue reviewing instruments useful in characterizing gases and aerosol in a constituent distributions in the atmosphere, and the processes that changing atmosphere control those distributions. The MOZAIC Program 10 (1994-2007) The previous issue focused on space based measurements for assessing tropospheric distributions. The mobile platforms treated In-service Aircraft for in this issue provide a more local picture of constituents than 18 Global Observations – the future satellite data, but a much broader view than seen with the measurement platforms fixed at a particular geographic location. As A new JAL project: 23 CONTRAIL such they are particularly useful as integrators of information, Comprehensive connecting the global picture gained from satellite measurements Observation Network with the local information associated with ground based for TRace gases by AIrLiner measurement strategies. One of the other distinguishing features of these platforms is that, unlike those used in relatively brief field Observations of the experiments, these measurements provide routine data over longer 31 atmospheric composition over time periods, sometimes years, allowing a more complete picture of Russia using a mobile many regions, such as the upper troposphere/ lower stratosphere laboratory: the that are difficult to sample routinely and which are important to the TROICA experiments climate system. -
Worlds Apart: How the Distance Between Science and Journalism Threatens America's Future
Worlds Apart Worlds Apart HOW THE DISTANCE BETWEEN SCIENCE AND JOURNALISM THREATENS AMERICA’S FUTURE JIM HARTZ AND RICK CHAPPELL, PH.D. iv Worlds Apart: How the Distance Between Science and Journalism Threatens America’s Future By Jim Hartz and Rick Chappell, Ph.D. ©1997 First Amendment Center 1207 18th Avenue South Nashville, TN 37212 (615) 321-9588 www.freedomforum.org Editor: Natilee Duning Designer: David Smith Publication: #98-F02 To order: 1-800-830-3733 Contents Foreword vii Scientists Needn’t Take Themselves Seriously To Do Serious Science 39 Introduction ix Concise writing 40 Talk to the customers 41 Overview xi An end to infighting 42 The incremental nature of science 43 The Unscientific Americans 1 Scientific Publishing 44 Serious omissions 2 Science and the Fourth Estate 47 The U.S. science establishment 4 Public disillusionment 48 Looking ahead at falling behind 5 Spreading tabloidization 48 Out of sight, out of money 7 v Is anybody there? 8 Unprepared but interested 50 The regional press 50 The 7 Percent Solution 10 The good science reporter 51 Common Denominators 13 Hooked on science 52 Gauging the Importance of Science 53 Unfriendly assessments 13 When tortoise meets hare 14 Media Gatekeepers 55 Language barriers 15 Margin of error 16 The current agenda 55 Objective vs. subjective 17 Not enough interest 57 Gatekeepers as obstacles 58 Changing times, concurrent threats 17 What does the public want? 19 Nothing Succeeds Like Substance 60 A new interest in interaction 20 Running Scared 61 Dams, Diversions & Bottlenecks 21 Meanwhile,