Incubation of spinach chloroplast membranes for 90 minutes in the presence of 50 mm KCN and 100 mum HgCl(2) produces an inhibition of photosystem I activity which is stable to washing and to storage of the chloroplasts at -70 C. Subsequent exposure of these preparations to NH(2)OH and ethylenediaminetetraacetic acid destroys O(2) evolution and flow of electrons from water to oxidized p-phenylen...

In this paper we propose the construction of Spatially Coupled Low-Density Parity-Check (SC-LDPC) codes using a Quasi-Cyclic (QC) algorithm. The QC based approach is optimized to obtain memory efficiency in storing the parity-check matrix in the decoders. A hardware model of the parity-check storage units has been designed for Xilinx FPGA to compare the logic and memory requirements for various...

The Cyclic Redundancy Check (CRC) was developed as a checksum algorithm for the detection of data corruption in the process of data transmission or storage. However, in some scenarios there's a CRC given which a set of data is expected to have, so the data itself has to be modi ed (at the end or at some chosen position) in a way that it computes to the given CRC checksum afterwards. We present ...

Recently, locally repairable codes has gained significant interest for their potential applications in distributed storage systems. However, most constructions in existence are over fields with size that grows with the number of servers, which makes the systems computationally expensive and difficult to maintain. Here, we study linear locally repairable codes over the binary field, tolerating m...

Symbol-pair codes, introduced by Cassuto and Blaum [1], have been raised for symbol-pair read channels. This new idea is motivated by the limitations of the reading process in high-density data storage technologies. Yaakobi et al. [8] introduced codes for b-symbol read channels, where the read operation is performed as a consecutive sequence of b > 2 symbols. In this paper, we come up with a me...

This paper is concerned with a generalization of classical inventory models (with xed ordering costs) that exhibit (s; S) policies. In our model, the distribution of demands in successive periods is dependent on a Markov chain. The model includes the case of cyclic or seasonal demand. The model is further extended to incorporate some other realistic features such as no ordering periods and stor...

This paper addresses the problem of integrating in a single model operational optimization and cyclic scheduling of continuous plants. Considered are multiproduct, multistage plants with finite intermediate storage capacity (FIS). A combined optimization approach introduces synergic effects for more effective scheduling and plant operation (Alle and Pinto, 2001a,b). The representation proposed ...

We present a new class of array codes based on a generalization of the RAID5 XOR parity code. The R5X0(n, r, p) code protects an array of n data disks and p parity disks with r symbols per column from as many as p arbitrary column erasures. Decoding and encoding in R5X0 is computed using only XOR and cyclic shift operations. R5X0 is a simple geometric generalization of RAID5 and has optimal upd...

The weight of dynamically generated content versus static content has progressed enormously. Preserving accessibility to this type of content raises new issues. However, there are no large-scale mechanisms to enforce referential integrity in the WWW. We propose a system, comprised of a distributed web-proxy and cache architecture, to access and automatically manage web content, static and dynam...

Electrochemical activation of carbon nanotube/polysulfone composite electrodes for enhanced heterogeneous electron transfer is studied. The physicochemical insight into the electrochemical activation of carbon nanotube/polymer composites was provided by transmission electron microscopy, Raman spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. Dopamine, ascorbic acid, ...