On Even Length Codes Over Finite Rings

Codes over finite rings have been studied in the early 1970. A great deal of attention has been given to codes over finite rings from 1990, because of their new role in algebraic coding theory and their successful application. The key to describing the structure of cyclic codes over a ring R is to view cyclic codes as ideals in the polynomial ring R[x]/, where n is the length of the code. In previous studies, some authors determined the structure of cyclic codes over Z4 for arbitrary even length by finding the generator polynomial, the number of cyclic codes for a given length and the duals for these codes, and also determined the structure of negacyclic codes of even length over the ring Z2a and their dual codes. In this thesis, we introduce cyclic codes of an arbitrary length n over the rings F2 + uF2 with u2 = 0 mod 2 and F2 + uF2 + u2F2 with u3 = 0 mod 2. We find a set of generators for these codes. The rank and the dual of these codes are studied as well. We will extend these results about the rings F2 +uF2 and F2 +uF2 +u2F2 to more general rings F2 + uF2 + u2F2 = : : : + uk-1F2 with uk = 0 mod 2. Finally we study the structure of (1 + u)-constacyclic codes of even length n over the ring F2 + uF2 with u2 = 0 mod 2. Also we extend this study to the ring F2 + uF2 + u2F2 with u3 = 0 mod 2

Engineering polymer informatics: Towards the computer-aided design of polymers

The computer-aided design of polymers is one of the holy grails of modern chemical informatics and of significant interest for a number of communities in polymer science. The paper outlines a vision for the in silico design of polymers and presents an information model for polymers based on modern semantic web technologies, thus laying the foundations for achieving the vision

Optimal Pricing and order quantity strategies for a firm offering multiple products facing customers cannibalization and random market demand

This paper studies a firm’s profitability problem offering its products into different market segments at differentiated prices. In order to improve the firms’ profitability the firm needs to decide the prices and order quantities allocations for each market segment. In perfect market segmentation, it is assumed that the customers do not cannibalize between market segments. Whereas, in the case of imperfect market segmentation, the customers are assumed to cannibalize from a high price market segment to a lower price segment. Models to determine the optimal strategies for pricing and order quantity for the perfect as well as for the imperfect market segmentations are proposed with both the deterministic and stochastic customers’ demand. The study has shown that the perfect market segmentation always yields higher revenues compared to no segmentation for a firm facing both the deterministic and stochastic demand situations. In addition to this, the study has also shown that when cannibalization exists, a firm is still able to yield higher revenues compared to the case of no market segmentation facing both the deterministic and stochastic demands, however, greater the extent of cannibalization could result substantial losses in the profitability

Traditional and Non-Traditional Risk Factors of Acute Coronary Syndrome in Young Women: Evidence from the ANCORS-YW Study

Rasheed Ibdah,1,&ast; Mohammed Al-Nusair,1,&ast; Raghad Abuhalimeh,2 Saad A Mahmoud,1 Bushra Laswi,1 Sukaina Rawashdeh,1 Ayman Hamoudeh,3 Khalid A Kheirallah4 1Division of Cardiology, Department of Internal Medicine, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan; 2School of Medicine, University of Jordan, Amman, Jordan; 3Department of Cardiology, Istishari Hospital, Amman, Jordan; 4Department of Public Health and Community Medicine, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan&ast;These authors contributed equally to this workCorrespondence: Khalid A Kheirallah, Jordan University of Science and Technology, P. O.Box 3030, Irbid, 22110, Jordan, Email [email protected]: Young women are at risk of acute coronary syndrome (ACS). They represent a unique population exposed to traditional cardiovascular risk factors and female sex-specific, non-traditional risk factors. The current study aimed to describe traditional and non-traditional risk factors of ACS in young women from the Middle East.Patients and Methods: The present study used data from the Jordanian, nationwide, multicenter, case-control study, ANCORS-YW. Bivariate analyses and logistic regression models were used to predict independent risk factors of ACS using adjusted odds ratios (AOR) and 95% confidence intervals (CI).Results: The study included 572 young women (≤ 50-years) with a median age of 45-years, divided into an ACS group (n=154, 26.9%) and a control group with no atherosclerotic cardiovascular disease (n=418, 73.1%). The most common presentation of ACS was non-ST-elevation ACS (n=98, 64%). The ACS group, compared to control group, had higher proportions of type-2 diabetes (41.6%vs.11.7%, p< 0.001), hypertension (53.9%vs.23.4%, p< 0.001), tobacco use (37.7%vs.24.2%, p=0.001), family history of cardiovascular disease (53.2%vs.23.4%, p< 0.001), metabolic syndrome (14.3%vs.2.4%, p< 0.001), and preterm delivery (24.7%vs.16.7%, p=0.032). ACS group had nonsignificantly greater proportions of hypertensive disorders of pregnancy (29.2%vs.22.7%, p=0.109) and gestational diabetes (15.6%vs.10.3%, p=0.081). Multivariable logistic regression analyses identified five independent predictors of ACS: type-2 diabetes (AOR, 95% CI: 3.45, 1.98&boxh;5.99), family history of cardiovascular disease (3.33, 2.15&boxh;5.17), tobacco use (2.01, 1.26&boxh;3.21), hypertension (1.72, 1.07&boxh;2.78), and metabolic syndrome (4.35, 1.72&boxh;11.03).Conclusion: Modifiable risk factors play an important role in ACS risk among young women. Efforts should be made to improve primordial and primary prevention in this population.Keywords: cardiovascular, female, ischemic heart disease, prevention, myocardial infarctio

New Future Ring Layout with Parallel Boreholes : Results from Small - Scale Blasting Tests

Validerat; 20130506 (global_studentproject_submitter

The relevance of colonoscopy in preoperative diagnosis of adnexal tumors

Diese Arbeit untersucht kritisch den Stellenwert der Koloskopie in der präoperativen Diagnostik von Adnexbefunden und die Planung des Operationsmanagements.This study analyses the significance of colonoscopy in preoperative diagnosis of adnexal tumors and its impact on further treatment