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Ferran Paredes, Cristian Herrojo, Javier Mata-Contreras, Miquel Moras, Alba Núñez, Eloi Ramon, Ferran Martín
A chipless radio-frequency identification (chipless-RFID) and sensing system, where tags are read by proximity (near-field) through a switch, is presented. The tags consist of a set of identical resonant elements (split-ring resonators or SRRs), printed or etched at predefined and equidistant positions, forming a linear chain, each SRR providing a bit of information. The logic state ('1' or '0') associated with each resonator depends on whether it is present or not in the predefined position. The reader is an array of power splitters used to feed a set of SRR-loaded transmission lines (in equal number to the number of resonant elements, or bits, of the tag)...
April 9, 2018: Sensors
Ana Causanilles, Daniela Rojas Cantillano, Erik Emke, Richard Bade, Jose Antonio Baz-Lomba, Sara Castiglioni, Erika Castrignanò, Emma Gracia-Lor, Félix Hernández, Barbara Kasprzyk-Hordern, Juliet Kinyua, Ann-Kathrin McCall, Alexander L N van Nuijs, Benedek G Plósz, Pedram Ramin, Nikolaos I Rousis, Yeonsuk Ryu, Kevin V Thomas, Pim de Voogt
In this work a step forward in investigating the use of prescription drugs, namely erectile dysfunction products, at European level was taken by applying the wastewater-based epidemiology approach. 24-h composite samples of untreated wastewater were collected at the entrance of eight wastewater treatment plants serving the catchment within the cities of Bristol, Brussels, Castellón, Copenhagen, Milan, Oslo, Utrecht and Zurich. A validated analytical procedure with direct injection of filtered aliquots by liquid chromatography-tandem mass spectrometry was applied...
April 2, 2018: Environment International
Marek Miszczyk, Marlena Płonka, Tomasz Stobiecki, Dorota Kronenbach-Dylong, Kazimierz Waleczek, Roland Weber
Market presence of illegal and counterfeit pesticides is now a global problem. According to data published in 2012 by the European Crop Protection Association (ECPA), illegal products represent over 10% of the global market of plant protection products. Financial benefits are the main reason for the prevalence of this practice. Counterfeit and illegal pesticides may contain substances that may pose a threat to the environment, crops, animals, and humans, inconsistent with the label and registration dossier...
April 3, 2018: Environmental Science and Pollution Research International
Ya-Chun Xu, Chao Xiong, Chun-Li Jiang, Yong-Bo Duan, Wei Sun, Shao-Yong Liu, Dong-Sheng Xue, Jian-Ping Xue
To identify the precious bile powder and its adulterants by DNA barcoding, and establish its standard experimental process to ensure the safe and effective utilization. Total twelve sequences from samples of bear bile powder which come from Ursus thibetanus for DNA extraction, PCR(polymerase chain reaction) and sequence, then using CodonCode Aligner V 7.0.1 shear primer region to obtain COI sequence. The COI sequences of U. arctos and their adulterants were obtained from GenBank. MEGA7.0 software was applied for analyzing mutation, calculating intraspecific and interspecific K2P(Kimura 2-Parameter) genetic distance and constructing the Neighbor-joining tree(NJ)...
February 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Zi-Lan Deng, Junhong Deng, Xin Zhuang, Shuai Wang, Kingfai Li, Yao Wang, Yihui Chi, Xuan Ye, Jian Xu, Guo Ping Wang, Rongkuo Zhao, Xiaolei Wang, Yaoyu Cao, Xing Cheng, Guixin Li, Xiangping Li
The emerging metasurfaces with the exceptional capability of manipulating an arbitrary wavefront have revived the holography with unprecedented prospects. However, most of the reported meta-holograms suffer from limited polarization controls for a restrained bandwidth, in addition to their complicated meta-atom designs with spatially-variant dimensions. Here, we demonstrate a new concept of vectorial holography based on diatomic metasurfaces consisting of meta-molecules formed by two orthogonal meta-atoms. Based on a simply linear relationship between phase and polarization modulations with displacements and orientations of identical meta-atoms, active diffraction of multiple polarization states and reconstruction of holographic images are simultaneously achieved, which is robust against both incident angles and wavelengths...
March 28, 2018: Nano Letters
Vanessa da Silva Oliveira, Ricardo Saldanha Honorato, Fernanda Araújo Honorato, Claudete Fernandes Pereira
Spectra recorded using a portable near infrared (NIR) spectrometer, Soft Independent Modeling of Class Analogy (SIMCA) and Linear Discriminant Analysis (LDA) associated to Successive Projections Algorithm (SPA) models were applied to identify counterfeit and authentic Brazilian Real (R$20, R$50 and R$100) banknotes, enabling a simple field analysis. NIR spectra (950-1650nm) were recorded from seven different areas of the banknotes (two with fluorescent ink, one over watermark, three with intaglio printing process and one over the serial numbers with typography printing)...
March 9, 2018: Forensic Science International
William F Herrington, Gajendra P Singh, Di Wu, Paul W Barone, William Hancock, Rajeev J Ram
The quality of therapeutic proteins such as hormones, subunit and conjugate vaccines, and antibodies is critical to the safety and efficacy of modern medicine. Identifying malformed proteins at the point-of-care can prevent adverse immune reactions in patients; this is of special concern when there is an insecure supply chain resulting in the delivery of degraded, or even counterfeit, drug product. Identification of degraded protein, for example human growth hormone, is demonstrated by applying automated anomaly detection algorithms...
March 23, 2018: Scientific Reports
Yingdong Han, Chao Gao, Yangbo Wang, Dandan Ju, Aihua Zhou, Feng Song, Ling Huang, Wei Huang
Recent years have witnessed the progress of lanthanide-doped materials from fundamental material synthesis to targeted practical applications such as optical applications in photodetection, anti-counterfeiting, volumetric display, optical communication, as well as biological imaging. The unique compositions and structures of well-designed lanthanide ion-doped materials could expand and strengthen their application performances. Herein, we report dual-mode luminescent crystalline microrods that spatially confine upconversion and downconversion photophysical process within defined regions using the specially designed heterogeneous structure...
March 23, 2018: Physical Chemistry Chemical Physics: PCCP
Zhu Zhuo, Yongsheng Liu, Dajiu Liu, Ping Huang, Feilong Jiang, Xueyuan Chen, Maochun Hong
Energy transfer (ET) is of fundamental importance in tuning the optical performance of lanthanide-doped upconversion nanoparticles (UCNPs). However, the fine control and manipulation of the ETs particularly for deleterious cross-relaxation type ETs (CR-ETs) in lanthanide-doped UCNPs remains a formidable challenge to date. Herein, we demonstrate a rational design strategy to manipulate the deleterious CR-ETs in lanthanide-doped UCNPs, by fine-tuning the distances at an extremely large length scale (>20 nm) among multiple lanthanide dopants that are simultaneously embedded into one single nanoparticle with specially designed multilayer nanostructures...
July 1, 2017: Chemical Science
Hazalila Kamaludin, Hairulnizam Mahdin, Jemal H Abawajy
Although Radio Frequency Identification (RFID) is poised to displace barcodes, security vulnerabilities pose serious challenges for global adoption of the RFID technology. Specifically, RFID tags are prone to basic cloning and counterfeiting security attacks. A successful cloning of the RFID tags in many commercial applications can lead to many serious problems such as financial losses, brand damage, safety and health of the public. With many industries such as pharmaceutical and businesses deploying RFID technology with a variety of products, it is important to tackle RFID tag cloning problem and improve the resistance of the RFID systems...
2018: PloS One
Xueyu Dou, Qing Zhou, Xiaohong Chen, Yeqiang Tan, Xin He, Ping Lu, Kunyan Sui, Ben Zhong Tang, Yongming Zhang, Wang Zhang Yuan
Nonconventional biomacromolecular luminogens have attracted extensive interests due to their fundamental importance and potential applications in diverse areas. To explore novel luminogens and moreover to gain deeper insights into their emission mechanism, we study the emission behaviors of sodium alginate (SA), a natural anionic polysaccharide composed of mannuronic (M) and guluronic acids (G). We find that the luminescence from aqueous SA solutions exhibits distinct concentration enhanced emission and aggregation-induced emission (AIE) characteristics...
March 20, 2018: Biomacromolecules
Benedikt Wigger, Thomas Meissner, Alexander Förste, Volker Jetter, André Zimmermann
A Physical Unclonable Function uses random and inherent properties of a physical entity and can be used to uniquely identify components e.g., for anti-counterfeiting purposes. In this work we demonstrate that the surface patterns of injection moulded plastic components themselves are inherently unique and hence can be used as a PUF for reliable and secure identification. We further demonstrate that these unique surface patterns are easily accessible since they can be photographed with a simple camera set-up...
March 16, 2018: Scientific Reports
Kathleen Hall Jamieson
After documenting the existence and exploring some implications of three alternative news narratives about science and its challenges, this essay outlines ways in which those who communicate science can more accurately convey its investigatory process, self-correcting norms, and remedial actions, without in the process legitimizing an unwarranted "science is broken/in crisis" narrative. The three storylines are: ( i ) quest discovery, which features scientists producing knowledge through an honorable journey; ( ii ) counterfeit quest discovery, which centers on an individual or group of scientists producing a spurious finding through a dishonorable one; and ( iii ) a systemic problem structure, which suggests that some of the practices that protect science are broken, or worse, that science is no longer self-correcting or in crisis...
March 13, 2018: Proceedings of the National Academy of Sciences of the United States of America
Jordan V Wang, Christopher B Zachary, Nazanin Saedi
This study addresses the dilemma concerned with meeting patients who may have encountered counterfeit esthetic devices in the marketplace. Over the past several years, we have witnessed a rise in counterfeit injectables and medical devices in our field. Often times, the procedures are marketed to patients at significantly reduced prices compared to competitors. Patients may be unaware that counterfeit devices exist and may unknowingly have procedures completed using untested and uncertified devices. It is important for clinicians to recognize when their patients may be encountering counterfeit devices, know what to do in this situation, and offer the best recommendations...
March 8, 2018: Journal of Cosmetic Dermatology
Gia Petriashvili, Mauro Daniel Luigi Bruno, Maria Penelope De Santo, Riccardo Barberi
In the last decade, much interest has grown around the possibility to use liquid-crystal droplets as optical microcavities and lasers. In particular, 3D laser emission from dye-doped cholesteric liquid crystals confined inside microdroplets paves the way for many applications in the field of sensors or tunable photonics. Several techniques can be used to obtain small microresonators as, for example, dispersing a liquid crystal inside an immiscible isotropic fluid to create an emulsion. Recently, the possibility to obtain a thin free-standing film starting from an emulsion having a mixture of water and polyvinyl alcohol as isotropic matrix has been reported...
2018: Beilstein Journal of Nanotechnology
Muhammad Sohail, Da-Wen Sun, Zhiwei Zhu
The role of packaging cannot be denied in the life cycle of any food product. Intelligent packaging is an emerging technology in the food packaging sector. Although it still needs its full emergence in the market, its importance has been proved for the maintenance of food quality and safety. The present review describes several aspects of intelligent packaging. It first highlights different tools used in intelligent packaging and elucidates the role of these packaging devices for maintaining the quality of different food items in terms of controlling microbial growth and gas concentration, and for providing convenience and easiness to its users in the form of time temperature indication...
March 7, 2018: Critical Reviews in Food Science and Nutrition
He Xu, Jie Ding, Peng Li, Feng Zhu, Ruchuan Wang
With the fast development of the Internet of Things, Radio Frequency Identification (RFID) has been widely applied into many areas. Nevertheless, security problems of the RFID technology are also gradually exposed, when it provides life convenience. In particular, the appearance of a large number of fake and counterfeit goods has caused massive loss for both producers and customers, for which the clone tag is a serious security threat. If attackers acquire the complete information of a tag, they can then obtain the unique identifier of the tag by some technological means...
March 2, 2018: Sensors
Chang-Yi Peng, Che-Wei Hsu, Ching-Wen Li, Po-Lin Wang, Chien-Chung Jeng, Cheng-Chung Chang, Gou-Jen Wang
In this study, a nano-imprinting method was introduced to fabricate polycarbonate films with transparent and flexible photonic crystal (FPC) structures. The fabricated flexible polymer films display a full-color grating due to the nano-hemispherical structures on the surface. Through the Bragg diffraction formula, it was confirmed that the FPC polymer films transfers part of the light energy to the second-order diffraction spectrum. Furthermore, the full-color grating properties can be modulated through geometric deformation due to the film's elasticity...
March 1, 2018: ACS Applied Materials & Interfaces
Tsz-Tsun Ng, Suying Li, Cheuk Chi A Ng, Pui-Kin So, Tsz-Fung Wong, Zhen-Yan Li, Shu-Ting Chan, Zhong-Ping Yao
In this study, we aim to establish a comprehensive spectral database for analysis of edible oils using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). More than 900 edible oil samples, including 30 types of edible oils, were analyzed and compared, and the characteristic peaks and spectral features of each edible oil were obtained. Edible oils were divided into eight groups based on their characteristic spectral patterns and principal component analysis results. An overall correct rate of 97...
June 30, 2018: Food Chemistry
Zhi-Jun Zhao, Minpyo Lee, Hyeokjung Kang, SoonHyoung Hwang, Sohee Jeon, Namkyoo Park, Sanghu Park, Jun-Ho Jeong
In this study, 8 inch-wafer scale flexible polarization-dependent color filters with Ag-TiO2 composite nanowires have been fabricated using nanoimprint and E-beam evaporation. The filters change their color via a simple rotation of the polarizer. In addition, the color of the filter can be controlled by altering the thickness of the Ag and TiO2 nanowires deposited on the polymer patterns. Polarization-dependent color filters were realized by selective inhibition of the transmission spectra using plasmonic resonance at the insulator/metal/insulator nanostructure interface, which occurs at particular wavelengths for the transverse magnetic polarizations...
February 20, 2018: ACS Applied Materials & Interfaces
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