In the paper we examine the problem of optimization of parameters of technological process for obtaining a molten pool with a needed depth on the surface of the metal sample under the thermal local laser treatment. A mathematical model of heat distribution during thermal laser treatment is simplified to a linear problem of heating a half-space, that can be used for plates of finite thickness. D...

Synaptic vesicles (SVs) fuse at a specialized membrane domain called the active zone (AZ), covered by a conserved cytomatrix. How exactly cytomatrix components intersect with SV release remains insufficiently understood. We showed previously that loss of the Drosophila melanogaster ELKS family protein Bruchpilot (BRP) eliminates the cytomatrix (T bar) and declusters Ca(2+) channels. In this pap...

The critical evidence for regarding populations of two or more forms as belonging to separate species is that they cari coexist without losing their genetic integrity by hybridization. This widely accepted definition is not invalidated by rare hybridisation since SO tenuous a gene exchange does not affect the integrity of the gene pool of the populations of the species (MAYR, LINSLEY, & USINGER...

Regulatory reform in the Nordic electricity-supply markets has resulted in a single integrated Nordic electricity market. This paper performs an econometric study of market power in the spot market of Nord Pool, the joint Nordic power exchange. I use a dynamic extension of the Bresnahan-Lau model, and weekly data for the period from 1996 through April 1999. To my knowledge, this is the first st...

In an experiment using two-bidder first-price sealed bid auctions with symmetric independent private values, we collected information on the female participants’ menstrual cycles. We find that women bid significantly higher than men in their menstrual and premenstrual phase but do not bid significantly different in other phases of the menstrual cycle. We suggest an evolutionary hypothesis accor...

Consumers buying goods online often cannot physically inspect the products prior to purchase. Thus an online market may turn what is usually regarded as a search good into an experience good. We investigate how this feature, together with other features of the marketplace, a¤ects a …rm’s choice between online and physical markets. Using a simple yet ‡exible framework, we show that the choice of...

Internet experiments are a new and convenient way for reaching a large subject pool. Yet, providing incentives to subjects can be a tricky design issue. One cost—effective and simple method is the publication of a high score (as in computer games). We test whether a high score provides adequate and non—distortionary incentives by comparing it to the usual performance based incentives. We find s...

Due to the depletion of the public IPv4 address pool, the transition to IPv6 became inevitable. However, the transition will take a long time, while the two incompatible versions of the Internet Protocol coexist. Different IPv6 transition technologies were developed, which can be used to enable the communication in various scenarios, but they also involve additional security issues. In this pap...

The combination of 3T and parallel-acquisition techniques holds promise for improved performance of contrast-enhanced MR angiography (MRA), in terms of speed, spatial resolution, and coverage. We present a comparison of 2 MRA techniques, including time-of-flight (TOF) and contrast-enhanced MRA, for detection and evaluation of intracranial aneurysms. Our results show that contrast-enhanced MRA w...