A constraint on antigravity of antimatter from precision spectroscopy of simple atoms

Consideration of antigravity for antiparticles is an attractive target for various experimental projects. There are a number of theoretical arguments against it but it is not quite clear what kind of experimental data and theoretical suggestions are involved. In this paper we present straightforward arguments against a possibility of antigravity based on a few simple theoretical suggestions and some experimental data. The data are: astrophysical data on rotation of the Solar System in respect to the center of our galaxy and precision spectroscopy data on hydrogen and positronium. The theoretical suggestions for the case of absence of the gravitational field are: equality of electron and positron mass and equality of proton and positron charge. We also assume that QED is correct at the level of accuracy where it is clearly confirmed experimentally.     

The Liège Oscillation code

The Liège Oscillation code can be used as a stand-alone program or as a library of subroutines that the user calls from a Fortran main program of his own to compute radial and nonradial adiabatic oscillations of stellar models. We describe the variables and the equations used by the program and the methods used to solve them. A brief account is given of the use and the output of the program.     

SIESTA, a time domain, general purpose simulation program for the VIRGO experiment

In this paper we present the simulation program that has been developed for the VIRGO gravitational wave detection experiment. Although this program — SIESTA — is still evolving, it has reached a stage where the design requirements have been largely fulfilled. We first remind the needs and the choices which have steered the program design and led to the present structure. The contents of the program is then reviewed, the performances are discussed, and some typical applications are briefly described.     

DSP并行引导方法在氢钟自动调谐系统中的应用

介绍了TMS320VC5402外挂程序存储器的在线编程技术,给出创建系统引导表的具体步骤并在此基础上重点讨论了16位并行引导装载方法,并在以DSP为核心的氢钟自动调谐系统中得以仿真实现。     

Estimation of Light Time Effects for Close Binaries in Triple Systems

We discuss implementation of light time effects in a general binary star program that solves for third body orbit parameters and binary star parameters together. The program combines radial velocities and light curves within a coherent analysis and can use data that are very unevenly distributed over time. By analyzing whole curves, the program has access to more information than only from eclipse timings. Results for λ Tau and VV Ori are shown.     

电视时间同步的可用性

本文综述了利用电视信号作时间、频率同步的各种技术和可能达到的精度，以及存在的一些问题和改进意见．     

利用Java JDBC进行数据库访问

Java现已成为开发Internet应用最热门的语言,而JDBC则是Java程序访问数据库最重要的技术,这里要介绍了是在WWW环境下,运用JavaJDBC连接数据库的技术,及JDBC的原理和例子。     

Geodynamic observations on the quasar VLBI network in 2009–2011

The hardware and software upgrades to the Quasar VLBI network have allowed one to increase the measurement accuracy of the Earth orientation parameters (EOPs) and to improve the quality of geodynamic observations. At present, the observations are performed within two national programs: 24-h sessions on three radio telescopes of the network to determine all five EOPs (the Ru-E program) and 1-h sessions on the Zelenchukskaya-Badary and Svetloe-Badary baselines (the Ru-U program) for a prompt determination of the Universal Time. The results of processing the observations from January 2009 to November 2011 are presented. The rms deviations of the EOPs obtained in the Ru-E program from the IERS 08 C04 series are 1 mas for the coordinates of the Earth??s pole, 0.38 mas for the coordinates of the celestial pole, and 34 ??s for the Universal Time. The rms deviations of the Universal Time obtained in the Ru-U program are 53 ??s.     

The Meteors, Meteoroids and Interplanetary Dust Program of the International Heliophysical Year 2007/9

Under the title ‘Meteors, Meteoroids and Interplanetary Dust’, meteor research is included in the program of the International Heliophysical Year 2007/9.We list issues for coordinated meteor research within the framework of this global international program.     

Computer studies of the evolution of planetary and satellite systems I. Description of the program: Preliminary tests

In this paper we describe a CDC-Cyber 74 program for computer simulation of the evolution of a system consisting of a large number of objects in orbit around a central body or primary. Some preliminary tests done with the program will also be described.     

Observing programs for the Pulkovo Horizontal meridian circle

Observing programs are discussed for the Pulkovo automatic horizontal meridian circle. The instrument is highly efficient and yields precise and accurate positions. We prepare an observing program of faint FK5 stars with the aim of improving on the system of this catalogue and also prepare a program of observations of IRS reference catalogue stars.     

Earth Impact Effects Program: A Web‐based computer program for calculating the regional environmental consequences of a meteoroid impact on Earth

Abstract— We have developed a Web‐based program for quickly estimating the regional environmental consequences of a comet or asteroid impact on Earth ( http:www.lpl.arizona.eduimpacteffects ). This paper details the observations, assumptions and equations upon which the program is based. It describes our approach to quantifying the principal impact processes that might affect the people, buildings, and landscape in the vicinity of an impact event and discusses the uncertainty in our predictions. The program requires six inputs: impactor diameter, impactor density, impact velocity before atmospheric entry, impact angle, the distance from the impact at which the environmental effects are to be calculated, and the target type (sedimentary rock, crystalline rock, or a water layer above rock). The program includes novel algorithms for estimating the fate of the impactor during atmospheric traverse, the thermal radiation emitted by the impact‐generated vapor plume (fireball), and the intensity of seismic shaking. The program also approximates various dimensions of the impact crater and ejecta deposit, as well as estimating the severity of the air blast in both crater‐forming and airburst impacts. We illustrate the utility of our program by examining the predicted environmental consequences across the United States of hypothetical impact scenarios occurring in Los Angeles. We find that the most wide‐reaching environmental consequence is seismic shaking: both ejecta deposit thickness and air‐blast pressure decay much more rapidly with distance than with seismic ground motion. Close to the impact site the most devastating effect is from thermal radiation; however, the curvature of the Earth implies that distant localities are shielded from direct thermal radiation because the fireball is below the horizon.     

Detecting neutrino transients with optical follow-up observations

A novel method is presented which will enhance the sensitivity of neutrino telescopes to identify transient sources such as Gamma-Ray Bursts (GRBs) and core-collapse Supernovae (SNe). Triggered by the detection of high energy neutrino events from IceCube or other large scale neutrino telescopes, an optical follow-up program will allow the identification of the transient neutrino source. We show that once the follow-up program is implemented, the achievable sensitivity of IceCube to neutrinos from SNe and GRBs would increase by a factor of 2–3. The program can be realized with a small network of automated 1–2 m telescopes and has rather modest observing time requirements.     

The role of relative ion flows on the thermal structure of the ionosphere

Calculations are presented which show that, contrary to previous suggestions, ion flow velocity differences do not have a significant effect on the thermal structure of the midlatitude topside ionosphere.     

Moroccan participation in the study of solar oscillations

An international program of cooperation linked Astrophysics Department of the University of Nice and the Astronomical and Geophysical Laboratory of Rabat. This program has permitted the installation of an observational instrument for the study of solar seismological phenomena in the framework of the IRIS programme, on the mountain site of Oukaïmeden, in Morocco.     

耀斑活动区的向量磁场

本文综述了耀斑活动区向量磁场的基本特征,并对第２３ 太阳活动周的有关研究选题提出了具体的建议。     

A precompiler for the formula manipulation system TRIGMAN

A translator has been written which simplifies the programming of problems with the formula manipulation system TRIGMAN. It allows for the introduction of a new data type, SERIES, into a FORTRAN program, and translates the user's program into legal FORTRAN. It should not be difficult to adapt it for other formula manipulation systems now being used in Celestial Mechanics.     

Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876 – 1986)

The solar program of the Astronomical Observatory of Madrid started in 1876. Observations were made in this institution to determine sunspot numbers and areas for ten solar cycles. The program was completed in 1986 and the resulting data have been published in various Spanish scientific publications. Four periods of this program (with different observers and instruments) were identified with the aid of the interesting metadata that has been made available. In the present work, the published data were retrieved and digitized. Their subsequent analysis showed that most of these data could be considered reliable given their very high correlation with reference indices (international sunspot number, group sunspot number, and sunspot area). An abrupt change emerged in the sunspots/groups ratio in 1946, which lasted until 1972.     

Creation of the Hubble Space Telescope

The Hubble Space Telescope has been the most successful space astronomy project to date, producing images that put the public in awe and images and spectra that have produced many scientific discoveries. It is the natural culmination of a dream envisioned when rocket flight into space was first projected and a goal set for the US space program soon after NASA was created. The design and construction period lasted almost two decades and its operations have already lasted almost as long. The capabilities of the observatory have evolved and expanded with periodic upgrading of its instrumentation, thus realizing the advantages of its unique design. The success of this long-lived observatory is closely tied to the availability of the Space Shuttle and the end of the Shuttle program means that the end of the Hubble program will follow before long.     

Equinox and equator determinations from hypothetical minor planet observations

Hypothetical observations of minor planets 1, 2, 3, 4, 6, 7, 8, 9, and 15 were computed for a ten year observing period commencing 2 Jan. 1980. The mean errors of the equinox and equator corrections were determined versus: the distribution of clear nights during the year; the length of the observing program; the number of minor planets included in the program; and the elongation from the Sun. It is concluded that the equinox and equator are best determined by: choice of a site with a minimum of 60% clear nights well distributed throughout the year; an observing program that lasts a minimum of four years, but that little is gained by extension of the program to more than ten years; inclusion of a minimum of four or five minor planets in the program, but that more than nine is not necessary; that the best four minor planets to use are numbers 1, 4, 7, and 15; and that observations should be made as far from opposition as possible, but that it is not essential to observe beyond quadrature.Presented at the Symposium Star Catalogues, Positional Astronomy and Celestial Mechanics, held in honor of Paul Herget at the U.S. Naval Observatory, Washington, November 30, 1978.