Voids in ultrathin oxide and electron-beam lithography-patterned windows were used to deposit Ge selectively. The number of islands is a function of the total amount of Ge deposited in a void or window. Our results show that islands smaller than the void/window size nucleate mainly near the periphery. This might be due to the tensile strain in the Si substrate near the oxide edge. The interrupt...

This paper presents a device proposal based on a junction between an absorbing semiconductor nanorod structure and another window semiconductor layer for solar cell application. The possibility of band gap tuning by varying the diameter of the nanorods along the length, higher absorption coefficient at nanodimensions, the presence of a strong electrical field at the nanorod-window semiconductor...

actThe collision probability in the MAC layer could become very high when a poor backoff algorithm is used, especially in e networks. The Binary Exponential Backoff (BEB) used in the IEEE 802.11 MAC protocol uses a uniform random distribution oose the backoff value. This often leads to reducing the effect of window size increment. This paper proposes a new backoff ithm called “Fibonacci Increme...

An image ultraviolet, visible light, or near infrared is projected onto the transparent window of the vacuum tube as shown in Fig. 1. The vacuum side of this window carries a sensitive layer called the photocathode. Light radiation causes the emission of electrons from the photocathode into the vacuum which are then accelerated by an applied DC voltage towards a luminescent screen (phosphor scr...

Most current web application use small objects to increase the data transfer speed between server and client. This leads to completion of the object transfer while the TCP is still in the initial slow-start phase, which starts with an initial window size. SCTP, a new transport layer protocol, uses congestion control mechanism that is similar to that of TCP but complements TCP’s deficiencies in ...

In this report, we discuss the modifications of the congestion control mechanism of TCP, which is the major transport-layer protocol in the current Internet, for high-speed and long-delay networks. We categorize them by the network congestion indications which a TCP sender utilizes to increase/decrease its congestion window size. We also introduce recent works of our research group, which is an...

We present a measurement study of an operative WLAN. After briefly presenting the methodology used to generate traffic and measure performance indices, we present results focusing on the performance perceived by TCP connections, to understand the mechanisms which have a major effect on performance. We investigate the impact of TCP parameters, like the maximum congestion window, the effectivenes...

The rapid growth of today's emerging high-speed networks has made currently implemented transport layer flow control techniques inadequate for the performance levels required now and in the future. Throughput at the upper layers is throttled due to architectural designs tailored to "last-generation" technologies. We define and analyze a transport layer flow control algorithm featuring hybrid op...

the aim of this study was to compare the lateral window and osteotome techniques for sinus lifting using histological and histomorphometric methods.in this clinical trial 10 patients (a total number of 14 sinus areas) who needed implant treatment in the atrophic posterior maxilla were enrolled. in all the cases the residual bone height between the sinus floor and the alveolar crest was less tha...

background: the aim of this study was to determine the correlation between ultrastructural studies for pinopodes expression after ovarian hyperstimulation and progesterone injection in mice. materials and methods: adult nmri mice were superovulated using human menopasual gonadotropic (hmg) and human chorionic gonadotropic (hcg) hormones; after that, daily injection of progesterone (1 mg/mouse) ...