9,645 research outputs found
Social Media Marketing Integration: Agile Project Management
The implementation of digital and social media strategies to currently existing marketing strategies requires extensive knowledge and expertise. Project management techniques and practices can be utilized to implement this change and determine its success. Because of the constantly evolving nature of social media marketing, an agile project management approach should be utilized to enhance chances of success. Social media marketing requires a thorough understanding of the target market and their behaviors on social media to deliver appropriate content utilizing the right mediums of communication. The ability to evaluate the success of a project and make changes as needed to meet the goals of the marketing strategies makes agile project management a suitable technique for implementing social media marketing
Modification of Angular Velocity by Inhomogeneous MRI Growth in Protoplanetary Disks
We have investigated evolution of magneto-rotational instability (MRI) in
protoplanetary disks that have radially non-uniform magnetic field such that
stable and unstable regions coexist initially, and found that a zone in which
the disk gas rotates with a super-Keplerian velocity emerges as a result of the
non-uniformly growing MRI turbulence. We have carried out two-dimensional
resistive MHD simulations with a shearing box model. We found that if the
spatially averaged magnetic Reynolds number, which is determined by widths of
the stable and unstable regions in the initial conditions and values of the
resistivity, is smaller than unity, the original Keplerian shear flow is
transformed to the quasi-steady flow such that more flattened (rigid-rotation
in extreme cases) velocity profile emerges locally and the outer part of the
profile tends to be super-Keplerian. Angular momentum and mass transfer due to
temporally generated MRI turbulence in the initially unstable region is
responsible for the transformation. In the local super-Keplerian region,
migrations due to aerodynamic gas drag and tidal interaction with disk gas are
reversed. The simulation setting corresponds to the regions near the outer and
inner edges of a global MRI dead zone in a disk. Therefore, the outer edge of
dead zone, as well as the inner edge, would be a favorable site to accumulate
dust particles to form planetesimals and retain planetary embryos against type
I migration.Comment: 28 pages, 11figures, 1 table, accepted by Ap
Monitoring and controlling distributed applications using Lomita (position paper)
Over the last four years, the Meta toolkit was developed for controlling distributed applications. This toolkit has been publicly available as part of the academic ISIS release, and has been used for building various system monitoring and control applications. One major stumbling block with using Meta has been the language (called NPL) it supports. NPL is very low-level and using it is difficult, in the same way it is difficult to write machine language programs or raw Postscript programs. Hence, a higher level language was built along with a runtime environment. The hope is that with this higher-level approach, more complicated Meta applications will be written and thereby concentrate more on the use (and limitations) of Meta as an architecture. The Meta toolkit is reviewed with its intended use. Next, the goals with Lomita and an overview is given of its architecture and language syntax. A detailed example is given of Lomita's use by presenting a complete program for a load-adaptable service
Orbital Evolution of Planets around Intermediate-Mass Giants
Around low- and intermediate-mass (1.5-3 M_sun) red giants, no planets have
been found inside 0.6 AU. Such a paucity is not seen in the case of 1 M_sun
main sequence stars. In this study, we examine the possibility that
short-period planets were engulfed by their host star evolving off the main
sequence. To do so, we have simulated the orbital evolution of planets,
including the effects of stellar tide and mass loss, to determine the critical
semimajor axis, a_crit, beyond which planets survive the RGB expansion of their
host star. We have found that a_crit changes drastically around 2 M_sun: In the
lower-mass range, a_crit is more than 1 AU, while a_crit is as small as about
0.2 AU in the higher-mass range. Comparison with measured semimajor axes of
known planets suggests that there is a lack of planets that only planet
engulfment never accounts for in the higher-mass range. Whether the lack is
real affects our understanding of planet formation. Therefore, increasing the
number of planet samples around evolved intermediate-mass stars is quite
meaningful to confirm robustness of the lack of planets.Comment: 4 pages, 3 figures, Part of PlanetsbeyondMS/2010 proceedings
http://arxiv.org/html/1011.660
A Semicoarsening Multigrid Algorithm for SIMD Machines
A semicoarsening multigrid algorithm suitable for use on single instruction multiple data (SIMD) architectures has been implemented on the CM-2. The method performs well for strongly anisotropic problems and for problems with coefficients jumping by orders of magnitude across internal interfaces. The parallel efficiency of this method is analyzed, and its actual performance is compared with its performance on some other machines, both parallel and nonparallel
Toward a Deterministic Model of Planetary Formation VII: Eccentricity Distribution of Gas Giants
The ubiquity of planets and diversity of planetary systems reveal planet
formation encompass many complex and competing processes. In this series of
papers, we develop and upgrade a population synthesis model as a tool to
identify the dominant physical effects and to calibrate the range of physical
conditions. Recent planet searches leads to the discovery of many
multiple-planet systems. Any theoretical models of their origins must take into
account dynamical interaction between emerging protoplanets. Here, we introduce
a prescription to approximate the close encounters between multiple planets. We
apply this method to simulate the growth, migration, and dynamical interaction
of planetary systems. Our models show that in relatively massive disks, several
gas giants and rocky/icy planets emerge, migrate, and undergo dynamical
instability. Secular perturbation between planets leads to orbital crossings,
eccentricity excitation, and planetary ejection. In disks with modest masses,
two or less gas giants form with multiple super-Earths. Orbital stability in
these systems is generally maintained and they retain the kinematic structure
after gas in their natal disks is depleted. These results reproduce the
observed planetary mass-eccentricity and semimajor axis-eccentricity
correlations. They also suggest that emerging gas giants can scatter residual
cores to the outer disk regions. Subsequent in situ gas accretion onto these
cores can lead to the formation of distant (> 30AU) gas giants with nearly
circular orbits.Comment: 54 pages, 14 Figures; accepted for publication in Astrophysical
Journa
ALTERNATIVE FUTURES OF RURAL AREAS IN THE EU: A COMPARATIVE ANALYSIS OF SCENARIO STUDIES
What does rural Europe look like in 2030? Is agriculture still the main land user? In recent years, studies such as ESPON, Eururalis, SCENAR2020, SENSOR, SEAMLESS and PRELUDE have tried to address these questions. These studies resulted in a number of alternative futures of rural areas in the EU. In this paper a comparative analysis of these scenario studies is made in order to explore differences and similarities in the scenarios and alternative futures of rural areas in the EU. For this purpose, we designed a scheme for assessing the properties of the various scenarios and a scheme for a systematic description of the rural futures according to the scenarios. It appears that most scenario studies use a baseline scenario and a set of alternative scenarios with different degrees of policy regulation. Agriculture will continue to be a main land user in 2030, although some land abandonment will take place.Rural Europe, scenario studies, alternative futures, land-use, territorial disparities, Agribusiness, Community/Rural/Urban Development, Research Methods/ Statistical Methods,
REAKSI INVESTOR PASAR MODAL PADA PENGUMUMAN PENGHAPUSAN KODE BROKER
The policy of removing the broker codes of securities companies on the Indonesia Stock Exchange (IDX) has occurred for the first time in the Indonesian capital market. This policy was expected to prevent investors from buying shares by following transactional activities carried out by brokers, because using the broker code of a securities company, it is possible to know which securities company buys or sells a particular stock. The aim of this research is to analyze the differences in trading volume, trading frequency, and abnormal returns before and after the removal of broker codes so that the IDX can find out the effectiveness of the removal of the broker codes of securities companies and to find out whether investors have knowledge or not in making decisions to invest in stocks. The non-probabilistic purposive sampling technique was used and 738 companies listed on the IDX were used as the research sample. This study used an event study approach and data were analyzed using the Wilcoxon Signed Ranks Test. The results show that there were differences in trading volume, trading frequency, and abnormal returns before and after the removal of broker codes. Based on these findings, the removal of broker codes is an event that has information content and investors are expected to be able to conduct a deeper analysis when investing in the capital market.
Keywords: trading volume; trading frequency; abnormal returns; broker code removal.
Peristiwa kebijakan penghapusan kode broker perusahaan sekuritas pada Bursa Efek Indonesia (BEI) adalah pertama kali terjadi di pasar modal Indonesia. Kebijakan tersebut diharapkan dapat mencegah perilaku ikut-ikutan investor dalam membeli saham dari aktivitas transaksi yang dilakukan oleh broker karena melalui kode broker perusahaan sekuritas dapat diketahui broker dari perusahaan sekuritas mana yang banyak membeli atau menjual saham tertentu. Tujuan riset ini adalah untuk menganalisis perbedaan volume perdagangan, frekuensi perdagangan, dan return tidak normal (abnormal return) sebelum dan sesudah penghapusan kode broker, sehingga BEI dapat mengetahui seberapa efektif penghapusan kode broker perusahaan sekuritas tersebut dan untuk mengetahui investor memiliki pengetahuan atau tidak dalam pengambilan keputusan untuk berinvestasi saham selama ini. Teknik pengambilan sampel yang dipergunakan adalah non-probabilistic sampling dengan jenis purposive sampling, dengan 738 perusahaan yang tercatat di BEI yang akan dipergunakan sebagai sampel penelitian. Riset ini menggunakan pendekatan event study dan data dianalisis menggunakan Wilcoxon Signed Ranks Test. Hasil analisis data menunjukkan adanya perbedaan volume perdagangan, frekuensi perdagangan, dan abnormal return sebelum dan sesudah penghapusan kode broker. Berdasar pada hal tersebut penghapusan kode broker merupakan peristiwa yang memiliki kandungan informasi dan investor diharapkan dapat melakukan analisis lebih dalam pada saat hendak berinvestasi pada pasar modal.
Kata kunci: volume perdagangan; frekuensi perdagangan; abnormal return; penghapusan kode broker
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