7,377 research outputs found
Resummation and Shower Studies
The transverse momentum spectra of the Z and Higgs bosons are studied, as
probes of the consequences of multiple parton emissions in hadronic events.
Emphasis is put on constraints, present in showers, that go beyond conventional
leading log. It is shown that, if such constraints are relaxed, better
agreement can be obtained with experimental data and with resummation
descriptions.Comment: 6 pages, LaTeX, 3 eps figures, submitted to the proceedings of the
Workshop on Physics at TeV Colliders, Les Houches, France, 26 May -- 6 June
200
Production of Jets at the Tevatron
Measurements of the inclusive jet cross section and the dijet angular
distribution using data from the Tevatron are presented. Comparisons to NLO QCD
show good agreement below 250 GeV, but CDF data show an excess at higher ET;
qualitative agreement is seen between the CDF and DO cross sections. Analysis
of the dijet angular distributions exclude quark compositeness below 2.1 TeV.Comment: 5 pages, 6 figure
SETI in 2021
In this second installment of SETI in 20xx, we very briefly and subjectively
review developments in SETI in 2021. Our primary focus is 93 papers and books
published or made public in 2021, which we sort into six broad categories:
results from actual searches, new search methods and instrumentation, target
and frequency selection, the development of technosignatures, theory of ETIs,
and social aspects of SETI.Comment: 10 pages, 0 figures, submitted to Acta Astronautica, comments welcom
Data base management system analysis and performance testing with respect to NASA requirements
Several candidate Data Base Management Systems (DBM's) that could support the NASA End-to-End Data System's Integrated Data Base Management System (IDBMS) Project, later rescoped and renamed the Packet Management System (PMS) were evaluated. The candidate DBMS systems which had to run on the Digital Equipment Corporation VAX 11/780 computer system were ORACLE, SEED and RIM. Oracle and RIM are both based on the relational data base model while SEED employs a CODASYL network approach. A single data base application which managed stratospheric temperature profiles was studied. The primary reasons for using this application were an insufficient volume of available PMS-like data, a mandate to use actual rather than simulated data, and the abundance of available temperature profile data
Measurement and Analysis of Wing and Tail Buffeting Loads on a Fighter Airplane
The buffeting loads measured on the wing and tail of a fighter airplane during 194 maneuvers are given in tabular form, along with the associated flight conditions. Measurements were made at altitudes of 30,000 to 10,000 feet and at speeds up to a Mach number of 0.8. Least-squares methods have been used for a preliminary analysis of the data. The agreement between the results of this analysis and the loads measured in stalls is sufficiently good to suggest the examination of the buffeting of other airplanes on the same basis
Results of data base management system parameterized performance testing related to GSFC scientific applications
The results of a variety of tests designed to demonstrate and evaluate the performance of several commercially available data base management system (DBMS) products compatible with the Digital Equipment Corporation VAX 11/780 computer system are summarized. The tests were performed on the INGRES, ORACLE, and SEED DBMS products employing applications that were similar to scientific applications under development by NASA. The objectives of this testing included determining the strength and weaknesses of the candidate systems, performance trade-offs of various design alternatives and the impact of some installation and environmental (computer related) influences
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