cancer is the second important reason of mortality in the world. in this regard melanoma was accounted as the most aggressive type of coetaneous cancer. among drug extracted from natural products from marine organisms have been focused investigations related to chemotherapeutic agents derived from echinoderms such as sea cucumbers and starfish.  in the present study, cytotoxic and apoptosis ind...

The object of this investigation was to gain a better understanding of the flow and fracture propensity of steel plates in which the Wells-type notch served as the fracture initiator. This type of notch is of importance in experimental investigations of the brittle fracture phenomenon because it successfully initiates low-stress brittle fractures in the wide-plate specimen in which it is used. ...

Abstract This article investigates utilization of polypropylene microfibers as reinforcement in geopolymer concrete to enhance the ductility characteristics since is considered a brittle material. The were added at fiber volume content 0.5%, 1.0%, and 1.5%. In this article, slump test compressive strength tested for concretes measure effect on concretes. Also, static flexural dynamic loading ap...

Metals are known for high ductility and have, been used to design fabricate structural components many years. However, composite materials taking over traditional owing their significant mechanical properties. Fiber-reinforced composites exhibit lower failure strain, resulting in brittle failure, limiting application where is desired. In this study, an effort has made design, fabricate, test co...

To accommodate rapidly increasing quantities of information and communication, optical fiber transmission technology with high-speed high-capacity is demanded. The development of an optical gain medium and fiber amplifiers to cover the 1250~1650 nm region, which is the entire optical telecommunication windows of silica fiber, becomes an important issue for ultra-wide broadband optical communica...

The (brittle) behavior of concrete, although used in many fields, impedes its use some applications that require (flexible) behavior, wherefore several types fibers were utilized among them polypropylene fiber (PPF), enhances pre-crack tensile strength, toughness, ductility performance, impact resistance, flexural strength and failure mode. This paper submits a comprehensive review previous stu...

Global estimates on aging predict an increased burden of asthma in the older population. Consequently, its recognition, diagnosis, and management in clinical practice require optimization. This review aims to provide an update for clinicians, highlighting advances in the understanding of the aging process and immunosenescence together with their applicability to asthma from a diagnostic and the...

The aim of this study was to determine evolution of T1 unenhanced hypointense lesions (acute or chronic black holes (ABHs, CBHs)) by measuring their magnetization transfer ratio (MTR) changes over 12 months. 40 glatiramer acetate (GA)-naive patients with relapsing-remitting MS who presented with 1 or more contrast-enhancing lesions (CELs) at baseline underwent 1.5-T MRI at baseline and after 12...

To explore the possibility of providing additional reinforcement to bio-cemented sand through fiber inclusions, a series sand-fiber mixtures were prepared by mixing with three types fibers (polypropylene fiber, basalt and carbon fiber) at different contents (0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 0.8% volume sand). Each mixture was subjected two cycles controlled microbial-induced calcite precipitatio...

Polyamide 6 (PA6) and short glass fiber (SGF) reinforced PA6 composites toughened with glycidylisobutyl oligomeric silsesquioxane (G-POSS) and 1.10-carbonyl-bis-caprolactam (CBC) were prepared by meltextrusion compounding process and then compounds were formed to 2 mm thick double edge notched tension samples (DENT) by injection moulding process. Fracture properties of composites were analyzed ...