We have studied light-induced birefringence (LIB) and surface relief grating (SRG) formation in the series of methylacrylate polymers. The effect of material structure such as length of photochromic side chain, glass transition temperature and molecular structure of azo units on LIB and SRG are studied. The optical formation of self-induced SRG on films of these materials is also presented.

background acupuncture has recently received considerable attention around the world due to its cost-effectiveness, few side effects, and well-established analgesic properties. objectives the present study aimed to identify the factors that might lead to using acupuncture for pain relief. patients and methods this qualitative study was conducted using conventional content analysis method. the s...

Disasters are on the rise, more complex, and donor support is increasingly unpredictable. In response to this trend humanitarian agencies are looking for more efficient and effective solutions. This paper discusses the evolution of supply chain management in disaster relief and the role of new players like the private sector. It is based on research conducted by the Humanitarian Research Group ...

with the eight sassanians reliefs, naghsh-e rustam in marvdasht is a prominent complex safeguarding a complete collection of the sassanian period. seven of these reliefs have been repeatedly the subject of investigations thanks to their relatively better conditions. the fifth relief, however, has not yet been studied due to their damaged status. it depicts the full-face portrait of a sassanid k...

Last mile distribution is the final stage of a humanitarian relief chain; it refers to delivery of relief supplies from local distribution centers (LDCs) to beneficiaries affected by disasters. In this study, we consider a vehicle-based last mile distribution system, in which an LDC stores and distributes emergency relief supplies to a number of demand locations. The main decisions are allocati...

Studies of humanitarian supply chain operations contribute to efficient system designs for the delivery goods and services disaster- conflict-stricken regions. However, our understanding what happens these relief after they are delivered is quite limited. Using a case study Za'atari refugee camp in Jordan, we develop theory informal networks, whereby uncover how refugee-led, networks emerge cam...