Towards inkjet-printed low cost passive UHF RFID skin mounted tattoo paper tags based on silver nanoparticle inks

The present work describes the inkjet printing and low temperature sintering of silver nanoparticle inks onto transfer tattoo paper. Our approach results in silver features of excellent resolution and conductivity and, subsequently the first passive UHF RFID transfer tattoo tags functional mounted on human skin of improved performance when compared to screen printed passive UHF RFID transfer tattoo paper tags. Moreover, inkjet printed passive UHF RFID transfer tattoo tags show similar performance to copper etched passive UHF RFID tags on plastic substrates. This study compares the image quality (resolution) and electrical performance of two commercial silver nanoparticle inks inkjet printed on transfer tattoo paper. The optimal printing and sintering parameters to obtain high resolution features of resistivities 20 to 57 times the resistivity of bulk silver (1.59 × 10?6 ohm cm) are described. We demonstrate how, by selectively depositing ink in specific areas of the antenna, read distance of passive UHF RFID tags can be increased from 54 to 68 cm whilst decreasing the amount of ink used by 33%. Furthermore, this approach results in inkjet printed passive UHF RFID tattoo tags with larger read distance than silver screen printed passive UHF RFID tattoo tags, 45 cm, and similar to copper etched passive UHF RFID plastic tags, 75 cm. Moreover, inkjet printed passive UHF RFID tattoo tags in this work are considerably thinner (1–5 ?m) than screen and etched passive UHF RFID tags (tens of micrometers) hence, making the former more appealing to the end user. In addition to this, inkjet printing is compatible with large area manufacturing techniques and has the potential to evolve as one of the most promising RFID mass-production techniques. Therefore, this work represents a step towards the commercialization of on-body transfer tattoo paper passive UHF RFID tags

Multi-State Logging Freeze Detection Passive RFID Tags

In this work the design and measurement of a passive UHF RFID smart tag suitable for monitoring and recording critical temperature violations in cold chain management are presented. The tag uses moving parts to detect and log different temperate states without the requirement for transceivers, memory and batteries. A simple mechanical method is proposed whereby a moving metallic plate is trapped in one of 4 possible positions by specific environmental temperatures whereby inducing a permanent state based change in the passive RFID tag response. The latched product critical temperature violations can be monitored via the read power required to turn on the tag transponder chip which differs in each state

Tamper Proof RFID Security Tag

In this publication we present a tamper proof long range platform tolerant uhf smart RFID tag to identify valuable or security sensitive products. The smart tag functions as platform tolerant tag but once detached from the host object, it will permanently stop to function buy rendering the RFID chip unusable. The tag substrate design for additive manufacturing, platform tolerant antenna design as well as electromagnetic performance and read range are provided

Passive UHF RFID Tilt Sensor

In this paper we introduce a bio-axis passive wireless UHF RFID tilt sensor for applications such as to increase safety in warehouse environment and damage detection in consumer goods and where long term monitoring of the product is essential without the need to supply power to the sensors. Simulation and prototype testing indicate it is possible to detect and isolate tilting in 3 axes

Introduction of The School of Medicine Students’ Journal

It is our honor to present the first issue of School of medicine students’ journal.This is the first issue of the Journal of medical and biological sciences related to young researchers and students that have started their journey in the faculty of medicine in Shahid Beheshti University of Medical Sciences with the assistance of a group of elite and interested students. Transparently, with enthusiasm along with scientific methods, it is hoped that over time, this journal would be able to bring scientific research output to the attention of all researchers and scholars around the world.Particularly, the process of selecting articles and reviewing them is as valid as to other distinct journals, and it does not differ in any aspect; however, the most indispensable point is the participation of medical students along with other students at Shahid Beheshti University of Medical Sciences in the conduct of the administration of the journal indeed. As a matter of fact, this is the nobility of this journal in which students directly assist in all aspects. In the course of the initiation of this journal, the students at the Student Research Committee were able to have regular meetings and review the most accredited scientific journals in order to be competitive with other journals. Apparently, we hope that the content of our journal would be interested by the scholars and researchers; furthermore, we desire ro become one of most trusted and accredited journals among the most recognized ones. I would like to appreciate Dr. Karimi, the professor of Immunology in the immunology department and the Director of Shahid Beheshti University of Medical Sciences magazines. Dr. Karimi has assisted the journal from all aspects and she worked non stop for the improvement of the quality of this journal. I would also like to thank Mr. Amir Hossein Aghdaee who worked truly hard as the Co-Editor-in-Chief and organized most of the works for the first issue of this journal. We wish to have a prosperous journal with the most trusted and accurate articles in which scientist would be able to benefit from them