Let F be a field of characteristic ` > 0 and let G be a finite group. It is well-known that the dimension of the minimal projective cover Φ1 (the so-called 1PIM) of the trivial left F[G]-module is a multiple of the `-part |G|` of the order of G. In this note we study finite groups G satisfying dimF(Φ1 ) = |G|`. In particular, we classify the non-abelian finite simple groups G and primes ` satis...

A new algori thm for computing the free distance of turbo codes is applied to the CCSDS and the UMTS standard codes. Results on the free distance behaviour for increasing interleaver length are also presented.

Human Contact Network is a kind of DTN (Delay Tolerant Networks), and is closely related with people’ activities. Owing to its intermittent connectivity and unique human mobility patterns, how to transmit data in an effective way is a challenging problem for DTN. In this paper, considering the regularity of people activities, we introduce a THM (Trip History Model) to record the activities of p...

The cancer risks (CR) by oral ingestion, dermal absorption, and inhalation exposure of trihalomethanes (THM) from tap water of ten districts in Fortaleza, Brazil were estimated. The mean levels of THM compounds were obtained in Fortaleza tap water as follow: 63.9 microg L(-1) for chloroform (CHCl(3)), 40.0 microg L(-1) for bromodichloromethane (CHBrCl(2)), and 15.6 microg L(-1) for dibromochlor...

Quantitative evidence of health and environmental tradeoffs between individuals' drinking water choices is needed to inform decision-making. We evaluated impacts using impact life cycle assessment (HIA, LCA) methodologies applied data from Barcelona, Spain. estimated the four scenarios for Barcelona population: 1) currently observed sources; a complete shift 2) tap water; 3) bottled or 4) filte...

The purpose of the study was to determine whether the risk of childhood acute lymphoblastic leukemia (ALL) associated with drinking water disinfection by-products was modified in the presence of variants in genes involved in the metabolism of trihalomethanes (THMs). We included a subset of cases from a population-based case-control study in a case-only study to estimate the interaction odds rat...

Coagulation behavior of aluminum chloride and polyaluminum chloride (PACl) for removing corresponding disinfection byproduct (DBP) precursors was discussed in this paper. CHCl3, bromine trihalomethanes (THM-Br), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) formation potential yields were correlated with specific ultraviolet absorbance (SUVA) values in different molecular weight (M...

1 I n t r o d u c t i o n The missing values problem is an old one for analysis tasks[8] [11]. The waste of da t a which can result f rom casewise deletion of missing values, obliges to propose alternatives approaches. A current one is to t ry to determine these values [9]. However, techniques to guess the missing values mus t be efficient, otherwise the complet ion introduces noise. Wi th the ...

A spatial tree is a data str uct ure for organizing graphical elements into a tree using their extents so as to optimized geometric queries on the database. Algorithms . are presented for insertion and deletion. Queries on 20 spatial trees are modeled as simple rectangles for windowing purposes. Query algorithms for rays and convex polyhedra are presented for 30 spatial trees. It is shown how a...