There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

https://www.uta.edu/rfmems/GI_Sensor/papers/ac040049d.pdf

Fiber-Optic Chemical Sensors and Biosensors

Today cross-cutting approaches, where molecular engineering and clever processing are synergistically coupled, allow the chemist to tailor complex hybrid systems of various shapes with perfect mastery at different size scales, composition, functionality, and morphology. Hybrid materials with organic–inorganic or bio–inorganic character represent not only a new field of basic research but also, via their remarkable new properties and multifunctional nature, hybrids offer prospects for many new applications in extremely diverse fields. The description and discussion of the major applications of hybrid inorganic–organic (or biologic) materials are the major topic of this critical review. Indeed, today the very large set of accessible hybrid materials span a wide spectrum of properties which yield the emergence of innovative industrial applications in various domains such as optics, micro-electronics, transportation, health, energy, housing, and the environment among others (526 references).

Applications of advanced hybrid organic–inorganic nanomaterials: from laboratory to market

An increase in world population along with a significant aging portion is forcing rapid rises in healthcare costs. The healthcare system is going through a transformation in which continuous monitoring of inhabitants is possible even without hospitalization. The advancement of sensing technologies, embedded systems, wireless communication technologies, nano technologies, and miniaturization makes it possible to develop smart systems to monitor activities of human beings continuously. Wearable sensors detect abnormal and/or unforeseen situations by monitoring physiological parameters along with other symptoms. Therefore, necessary help can be provided in times of dire need. This paper reviews the latest reported systems on activity monitoring of humans based on wearable sensors and issues to be addressed to tackle the challenges.

Wearable Sensors for Human Activity Monitoring: A Review

A novel technique (Ionic Self-Assembled Monolayer Process) to build up coatings on optical fibers is presented. With this technique is possible to control the thickness of the coating on the nanometer scale. Optical fiber sensors and other devices such as optical filters are experimentally demonstrated.

Self-assembled optical fiber sensors

The use of planar waveguides has recently shown great success in the field of optical sensors based on the Lossy Mode Resonance (LMR) phenomenon. The properties of Graphene Oxide (GO) have been widely exploited in various sectors of science and technology, with promising results for gas sensing applications. This work combines both, the LMR-based sensing technology on planar waveguides and the use of a GO thin film as a sensitive coating, to monitor ethanol, water, and acetone. Experimental results on the fabrication and performance of the sensor are presented. The obtained results showed a sensitivity of 3.1, 2.0, and 0.6 pm/ppm for ethanol, water, and acetone respectively, with a linearity factor R2 > 0.95 in all cases.

/pdf/gas-sensor-based-on-lossy-mode-resonances-by-means-of-thin-q7nvgqmx.pdf

Gas Sensor Based on Lossy Mode Resonances by Means of Thin Graphene Oxide Films Fabricated onto Planar Coverslips

An optical fiber immunosensor based on long period gratings (LPGs) made by periodic laser ablation is presented in this work. In order to be able to modify the effective index of the fundamental and the cladding modes, a cladding-etched SMF (CE-SMF) was coated with tin dioxide and after that the grating was created by periodic ablation of the overlay. Type G immunoglobulins (IgGs) were attached to (3-glycidyloxypropyl) trimethoxysilane (GPTMS) overlay. Samples with anti-IgGs concentrations ranging from 1 mg/L to 100 mg/L have been studied and a maximum sensitivity of 1.2 nm/(mg/L) was obtained. There is still room for the improvement of this optical platform.

Optical Fiber Immunosensor Based on Long Period Gratings Built by Periodic Laser Ablation

A framework for validating key competencies to be acquired during curricular company internships in Engineering degrees is presented. Such competencies are essential in the EHEA initiative but their evaluation is a challenge due to the non-cognitive nature of many of them and the diverse and informal learning environments. The proposed framework has been successfully employed since 2013 at the School of Industrial and Telecommunications Engineering of the Public University of Navarre.

Evaluating engineering competencies in curricular internships

In this work, the fabrication and characterization of refractometers based on lossy mode resonances (LMR) is presented. Tin dioxide (SnO 2 ) films deposited on optical fibers are used as the LMR supporting coatings. These resonances shift to the red as a function of the external refractive index, enabling the fabrication of robust and highly reproducible wavelength-based optical fiber refractometers. The obtained SnO 2 -based refractometer shows an average sensitivity of 7198 nm/refractive index unit (RIU) in the range 1.3331.420 RIU. Keywords: Optical fiber; LMR; Refractive index; Refractometer; Tin oxide; dip-coating 1. INTRODUCTION Measurement of refractive index (RI) is needed in different areas. For this reason, many RI sensors have been proposed for several applications, including industrial process monitoring, quality control in the food industry, and biomedical applications. The Abbe refractometer is a well-known standard apparatus to measure RI in the visible and near-IR spectrum [1, 2]. However, some limitations of traditional refractometers, such as size and weight, have made necessary the development of novel devices. A field of research has focused on optical fibers sensors to measure RI. Optical fiber refractometers are a promisi ng and attractive tool in chemical and bi otechnological applications due to their advantages, such as high sensitivity, immunity to electromagnetic interference, compact size and the possibility of remote sensing. In addition to this, different optical fiber architectures and techniques have been used for the fabrication of optical fiber refractometers, such as polished fibers [3], tapered fibers [4] and hetero-core [5] fibers based on surface plasmon resonances, long-period fiber gratings [6] or cladding removed multi-mode fibers (CRMMF) based on lossy mode resonances (LMRs) [7-10]. Concretely in the field of LMRs, previous works have studied the advantages of the utilization of these resonances [9] and the properties of the coatings in order to obtain the adequate conditions to produce LMRs [10]. LMRs can be produced by means of the fabrication of a metal oxide coating onto the optical fiber core core, more details about this phenomenon can be found in th e literature [7-10, 14]. In this work, an optical fiber refractometer based on Lossy M ode Resonances (LMR) is presented. More specifically, this work is focused on the fabrication of LMR-based refractometers based on tin dioxide (SnO

Ignacio R. Matias

Papers

Self-assembled optical fiber sensors

Gas Sensor Based on Lossy Mode Resonances by Means of Thin Graphene Oxide Films Fabricated onto Planar Coverslips

Optical Fiber Immunosensor Based on Long Period Gratings Built by Periodic Laser Ablation

Evaluating engineering competencies in curricular internships

SnO2 based optical fiber refractometers