Rates of convergence for Renyi entropy in extreme value theory

Max stable laws are limit laws of linearly normalized partial maxima of independent identically distributed random variables. Saeb (2014) proves that the Renyi entropy of order b (b > 1) of linear normalized maximum of iid random variables with continuous differentiable density is convergent to the Renyi entropy of order b of the max stable laws. In this paper, we study the rate of convergence result for Renyi entropy for linearly normalized partial maxima.Comment: arXiv admin note: text overlap with arXiv:1402.094

INVESTIGATION OF GENETIC DIVERSITY, PHYLOGENY AND SUB-SPECIES STRUCTURING IN THE ENTOMOPATHOGENIC NEMATODE HETERORHABDITIS

We used Random amplified polymorphic DNA (RAPDs), partial ribosomal DNA (rDNA), the mitochondrial gene cytochrome oxidase subunit I (cox1) and major sperm protein (msp) sequence analysis to investigate genetic diversity and population structure in Heterorhabditis bacteriophora, H. indica, H. marelata, H. megidis, H. downesi and H. zealandica comprising 18 isolates collected from different parts of the world. Blastn similarity search performed for the partial rDNA sequences confirmed the identity of Heterorhabditis species and suggested that all the unknown isolates belonged to H. bacteriophora. Blastn e-values for the species and isolates ranged between 0 to 9e-145. Genetic diversity and phylogenetic analysis produced dendrograms that showed high degrees of genetic variations among Heterorhabditis species with the overall average pairwise distance values of 0.3217, 0.6391, 0.7963 and 0.0572 for RAPD, partial rDNA, cox1 and msp, respectively. Although we expected low genetic diversity among H. bacteriophora isolates due to alternate automictic and amphimictic lifecycle and lack of long distance movement capability restricting gene flow, our results demonstrate highly structured genetic variation among the isolates. Phylogenetic analysis showed that H. bacteriophora isolates is a species complex that contain at least two two new species KMD10 and GPS5. Further H. bacteriophora sensu Pionar populations can be divided into two major groups: “HP88” and “Oswego”. We conclude that strictly relying on ITS sequences based blastn for Heterorhabditis species identification is misleading.OARD

Thyroid exposure in brain CT-scan and skull X-ray, using different levels of mA and Kvp with and without thyroid shield.

زمینه و هدف: امروزه در تصویر برداری های رادیولوژیکی از جمجمه، پرتو گیری تیروئید، به عنوان یک عضو بحرانی، اهمیت فراوانی دارد. این مطالعه با هدف بررسی دز دریافتی تیروئید در دو روش سی تی اسکن مغز و رادیوگرافی معمول جمجمه، با اعمال مقادیر مختلف شدت جریان و اختلاف پتانسیل با و بدون استفاده از شیلد تیروئید انجام شد. روش بررسی: در این مطالعه توصیفی- تحلیلی 350 بیمارسرپایی انتخاب و قبل از پرتودهی 2 عدد قرص TLD (Thermo luminescence Dosimetr) بر روی تیروئید هر بیمار نصب شد. برای انجام سی تی اسکن مغز سه سطح مختلف شدت جریان (در 210 بیمار) و برای رادیوگرافی معمول جمجمه دو سطح مختلف اختلاف پتانسیـــل (در 140 بیمار) استفاده گردید. پرتودهی ها با و بدون استفاده از شیلد تیروئید انجام شد. سپس TLD ها قرائت و داده به کمک آزمون آماری t دانشجویی تجزیه و تحلیل شدند. یافته ها: در آزمون های سی تی اسکن (با Kvp ثابت)، با کاهش شدت جریان از 150 به 125 میلی آمپر میزان پرتوگیری تیروئید از 38/9±101 به 04/8±2/82 میلی رم رسید (01/0

Investigating the impact of curing system on structure-property relationship of natural rubber modified with brewery by-product and ground tire rubber

The application of wastes as a filler/reinforcement phase in polymers is a new strategy to modify the performance properties and reduce the price of biocomposites. The use of these fillers, coming from agricultural waste (cellulose/lignocellulose-based fillers) and waste rubbers, constitutes a method for the management of post-consumer waste. In this paper, highly-filled biocomposites based on natural rubber (NR) and ground tire rubber (GTR)/brewers’ spent grain (BSG) hybrid reinforcements, were prepared using two different curing systems: (i) sulfur-based and (ii) dicumyl peroxide (DCP). The influence of the amount of fillers (in 100/0, 50/50, and 0/100 ratios in parts per hundred of rubber) and type of curing system on the final properties of biocomposites was evaluated by the oscillating disc rheometer, Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, swelling behavior, tensile testing, and impedance tube measurements. The results show, that the scorch time and the optimum curing time values of sulfur cured biocomposites are affected by the change of the hybrid filler ratio while using the DCP curing system, and the obtained values do not show significant variations. The results conclude that the biocomposites cured with sulfur have better physico-mechanical and acoustic absorption, and that the type of curing system does not influence their thermal stability. The overall analysis indicates that the difference in final properties of highly filled biocomposites cured with two different systems is mainly affected by the: (i) cross-linking efficiency, (ii) partial absorption and reactions between fillers and used additives, and (iii) affinity of additives to applied fillersPostprint (published version