Who gains from capital market integration: Tax competition between unionized and non-unionized countries

The welfare effects of capital market integration are examined under a model of tax competition with two asymmetric countries. The asymmetry is expressed through the labor market: one country has a perfect labor market whereas the other country is unionized. Our results show that the welfare effects of capital market integration are different depending on whether governments play an active role in attracting capital: in the absence of active governments, the capital market integration benefits the country with a competitive labor market and harms the unionized country. If the governments are active and compete for mobile capital using tax/subsidy, the market integration benefits both countries. The governmentfs incentive to participate in a tax/subsidy game is also examined in the integrated capital market. We find that the unionized country always prefers to participate in the tax/subsidy game, but the non-unionized country avoids the game if it is a capital importer.Capital Market Integration, Capital Mobility, Tax Competition, Trade Unions, Welfare.

Spatio-temporal characterization of Cassiopeia A

Analyzing the X-ray data of supernova remnants (SNRs) are among the most challenging task in the current X-ray astronomy because SNRs are both spatially extended and variable over time. We developed the strategy to track the time-series properties of all the parts constituting a diffuse structure by introducing the free-form image registration technique based on B-spline, and demonstrated the methodology using the Chandra data of Cassiopeia A. We successfully extracted the spatial distribution map of the time variability of continuum luminosity. To our knowledge, this is the first comprehensive characterization of such a dynamic diffuse target both in spatial and temporal viewpoints. We found that each of the four clusters derived by applying k-means algorithm to the extracted light curves has a clear physical meaning distinct from other clusters, which shows that our method is not a mere technique for automation but capable of capturing the underlying physics.Comment: 13 pages, 6 figures, Accepted for publication in ApJ. The movie corresponding to Fig.3 (which demonstrates the result better) is available at http://s.rikkyo.ac.jp/IchinoheSato202

Effect of Powder Compaction in Plastic Laser Sintering Fabrication

Powder compaction is introduced into plastic laser sintering fabrication. Compaction was carried out by using a roller of which rotation speed is independently controlled of its traversing speed. This additional process improved packing density of powder bed by a factor of 20% and reduced residual porosity of obtained parts by a factor of 30%. As an advantage, powder compaction can improve mechanical strength of parts of semi-crystalline powder, but increases excessive sinter to reduce fabrication accuracy especially in fabrication of amorphous plastic. This paper presents characteristics of the powder compaction process itself and its effects on performance of obtained parts.Mechanical Engineerin

高速度カメラを用いた対話型システムの実装と評価

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