Silk fibroin, a widely used natural biopolymer, presents remarkable flexibility and biodegradability, making it of great interest as polymer matrix for functional composite materials. Herein, composites silk nanofibrils metal–organic framework (MOF) nanosheets were successfully fabricated by coincubation coassembly process. Under heat incubation, fibroin self-assembled into one-dimensional nano...

In this paper, fabric density influence on the shielding effectiveness of electromagnetic shielding fabric is studied. A series of blended shielding fabrics are tested using a waveguide tube testing method to obtain the shielding effectiveness with different density. Experimental results show that the shielding effectiveness increases with the increase of fabric density, and there are two rapid...

To develop materials for shielding astronauts from the hazards of GCR, natural Martian surface materials are considered for their potential as radiation shielding for manned Mars missions. The modified radiation fluences behind various kinds of Martian rocks and regolith are determined by solving the Boltzmann equation using NASA Langley's HZETRN code along with the 1977 Solar Minimum galactic ...

An enormous change in the dislocation-mediated plasticity has been found a bulk semiconductor that exhibits photoplastic effect. Herein, we report UV (365 nm) light irradiation during mechanical testing dramatically decreases fracture toughness of ZnS. The crack tip on (001) single-crystal ZnS, as measured by near-tip opening displacement method, is increased ?45% complete darkness compared to ...

SUMMARY The paper investigates efficiency of different shielding techniques. The study was performed on the basis of 3-D substation model design where the finite-element method for calculation of magnetic fields (the EMAS software) was used and measurements were performed. The study was designed to meet the following objectives: − to obtain a useful analytical tool for evaluation of magnetic fi...

PURPOSE Ionizing radiation is implicated in nearly 2% of malignancies in the United States; radiation shields prevent unnecessary radiation exposure during medical imaging. Contemporary radiation shield utilization for adult patients in the United States is poorly defined. Therefore, we evaluated the prevalence of protective shielding utilization in adult patients undergoing CT scans in United ...

Pollution by polybrominated diphenyl ethers (PBDEs) is a major concern due to their bioaccumulation, persistence, and carcinogenicity. This study aimed investigate the decabrominated ether (BDE-209) photodegradation in soil suspensions. The results indicate BDE-209 can degrade suspensions its degradation follows pseudo-first-order kinetics. light sources intensity effects were studied rates 500...

The relationship between surface transfer impedance and stirred mode chamber shielding effectiveness proposed by Eicher and Boillot has been simplified. This simplified relationship was used to compare the measured stirred mode chamber shielding effectiveness of nine shielding artifacts with the shielding effectiveness of the same samples calculated from transfer impedance measurements made at ...

normal 0 false false false en-us x-none fa introduction: in radiation therapy centers across iran, protection of normal tissues is usually accomplished by either cerrobend or lead block shielding. in this study, the influence of these two shielding methods on central axis dose distribution of photon beam a cobalt unit was investigated in clinical conditions. materials and methods: all measureme...