Mass spectra of C(CI-I3)" Si(CI-I3)" Ge(CI-I3)" Sn(CI-I3)" and Pb (CI-Ia), were obtained with a Consolidated 21103 mass spectrometer. I sotopic abundan ces of carbon , si licon , germanium, tin, and lead were obtained from t he observed spectra and used to calculate the monoisotopic spectra. The mass spectra of t he Group IV tetramethyls a re qualitatively similar. The principal ion in each cas...

The Host Identity Protocol (HIP) uses cryptographic host identities to provide secure and efficient end-to-end communication without requiring a distributed key authority. However, HIP hosts can be vulnerable to DoS attacks and require some infrastructure to support simultaneous mobility of end points. The Internet Indirection Infrastructure (i3) overlay network can be used to provide these des...

Previous studies have indicated the presence of a cholera toxin-sensitive phospholipase D (PLD) in cultured RBL-2H3 mast cells that is synergistically activated via calcium, protein kinase C, and another unidentified signal. Here we identify a third potential signal for activation transduced by a pertussis toxin-sensitive trimeric GTP-binding protein, most likely via G(i2) or G(i3). Quercetin-t...

abstract in order to study the effects of cultivation method and water quantities in drip irrigation on yield of potato, an experiment was carried out using a split plot based on randomized complete block design with 4 replications in torogh agricultural research station (mashhad, iran) for tow years (2001 and 2002). the main-plots were divided into 3 levels of irrigation: i1= 100, i2= 80 and i...

sustainable economical production of tea depends on the proper use of water and fertilizer. for this purpose, the role of supplemental irrigation and nitrogen fertilizer on economical production of tea plantations was studied by assessment of yield, production function, water use efficiency, and benefit/cost ratio, and final return in a field experiment at feshalam tea research station in fouma...

Let p be a large prime number, K,L, M, λ be integers with 1 ≤ M ≤ p and gcd(λ, p) = 1. The aim of our paper is to obtain sharp upper bound estimates for the number I2(M ; K, L) of solutions of the congruence xy ≡ λ (mod p), K + 1 ≤ x ≤ K + M, L + 1 ≤ y ≤ L + M and for the number I3(M ; L) of solutions of the congruence xyz ≡ λ (mod p), L + 1 ≤ x, y, z ≤ L + M. Using the idea of Heath-Brown from...

With the increase in the size and weight of 300-mm wafers, the factory area must be enlarged accordingly. Due to the flow of material over long distances, the elimination of manual wafer handling has become necessary. Consequently, an automated material handling system (AMHS) is required for 300-mm semiconductor manufacturing facilities. The design of an AMHS must not only be capable of meeting...

The integrated circuit (IC) manufacturing industry is one of the biggest output industries in this century. The 300mm wafer fabs is the major fab size of this industry. The automatic material handling system (AMHS) has become one of the most concerned issues among semiconductor manufacturers. The major lot delivery of 300mm fabs is used overhead hoist transport (OHT). The traffic jams are happe...