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Micromachines Nov 2022This paper presents the design and development of a quad-port smart textile antenna for bio-healthcare applications. The antenna is designed to operate in the...
This paper presents the design and development of a quad-port smart textile antenna for bio-healthcare applications. The antenna is designed to operate in the ultra-wideband (UWB) spectrum (3.1−12 GHz) with an impedance bandwidth of 8.9 GHz. The size of the unit cell and multiple-input multiple-output (MIMO) antenna are 0.25λ0 × 0.2λ0 × 0.015λ0 and 0.52λ0 × 0.52λ0 × 0.015λ0, respectively. The antenna has a maximum efficiency of 93% and a peak gain of 4.62 dBi. The investigation of diversity metrics is performed and the results obtained are found to be ECC < 0.08 and DG < 9.99 dB. The computed CCL and TARC values are <0.13 bits/s/Hz and <−12 dB, respectively. The SAR analysis of the antenna shows a value of 0.471 Watt/Kg at 4 GHz, 0.39 Watt/Kg at 7 GHz, and 0.22 Watt/Kg at 10 GHz.
PubMed: 36363940
DOI: 10.3390/mi13111919 -
Clinical Research in Cardiology :... Mar 2022During the COVID-19 pandemic, compulsory masks became an integral part of outdoor sports such as jogging in crowded areas (e.g. city parks) as well as indoor sports in... (Randomized Controlled Trial)
Randomized Controlled Trial
BACKGROUND
During the COVID-19 pandemic, compulsory masks became an integral part of outdoor sports such as jogging in crowded areas (e.g. city parks) as well as indoor sports in gyms and sports centers. This study, therefore, aimed to investigate the effects of medical face masks on performance and cardiorespiratory parameters in athletes.
METHODS
In a randomized, cross-over design, 16 well-trained athletes (age 27 ± 7 years, peak oxygen consumption 56.2 ± 5.6 ml kg min, maximum performance 5.1 ± 0.5 Watt kg) underwent three stepwise incremental exercise tests to exhaustion without mask (NM), with surgical mask (SM) and FFP2 mask (FFP2). Cardiorespiratory and metabolic responses were monitored by spiroergometry and blood lactate (BLa) testing throughout the tests.
RESULTS
There was a large effect of masks on performance with a significant reduction of maximum performance with SM (355 ± 41 Watt) and FFP2 (364 ± 43 Watt) compared to NM (377 ± 40 Watt), respectively (p < 0.001; ηp = 0.50). A large interaction effect with a reduction of both oxygen consumption (p < 0.001; ηp = 0.34) and minute ventilation (p < 0.001; ηp = 0.39) was observed. At the termination of the test with SM 11 of 16 subjects reported acute dyspnea from the suction of the wet and deformed mask. No difference in performance was observed at the individual anaerobic threshold (p = 0.90).
CONCLUSION
Both SM and to a lesser extent FFP2 were associated with reduced maximum performance, minute ventilation, and oxygen consumption. For strenuous anaerobic exercise, an FFP2 mask may be preferred over an SM.
Topics: Adult; Athletes; Athletic Performance; Bicycling; Blood Pressure; COVID-19; Cross-Over Studies; Exercise Test; Heart Rate; Humans; Male; Masks; Oxygen Consumption; SARS-CoV-2
PubMed: 34091726
DOI: 10.1007/s00392-021-01877-0 -
EMBO Reports Oct 2023The key to reducing errors in science is collaboration between all practitioners-researchers, funders and editors-through a shared motivation to nurture scientists and...
The key to reducing errors in science is collaboration between all practitioners-researchers, funders and editors-through a shared motivation to nurture scientists and promote discovery.
PubMed: 37712331
DOI: 10.15252/embr.202357887 -
Journal of Clinical Pathology Aug 1995
Topics: Acquired Immunodeficiency Syndrome; HIV Infections; Humans; Mycobacterium; Mycobacterium Infections, Nontuberculous; Mycobacterium chelonae
PubMed: 7560192
DOI: 10.1136/jcp.48.8.701 -
British Medical Journal Aug 1912
PubMed: 20766272
DOI: 10.1136/bmj.2.2694.350 -
Optics Express Jun 2022Scaling up the power of on-chip diode lasers is of great importance for many emerging applications, such as integrated nonlinear optics, remote sensing, free space...
Scaling up the power of on-chip diode lasers is of great importance for many emerging applications, such as integrated nonlinear optics, remote sensing, free space communication, infrared countermeasure, and light detection and ranging (LIDAR). In this manuscript, we introduce and demonstrate photonic integrated circuits (PIC) based beam combining methods to create power scalable, integrated direct diode laser systems. Traditional laser beam combining, including coherent beam combining (CBC) and wavelength beam combining (WBC), usually requires free space or fiber optical components, leading to bulky and complex systems. Instead, PIC based beam combining methods can greatly reduce the cost, size, weight, and power consumption (CSWaP) of next generation direct diode laser systems. We experimentally demonstrate four channel chip-scale CBC and WBC with watt-level on-chip power by using III/V-SiN hybrid integration. Our results show that PIC based beam combining is very suitable for power scaling in a chip-scale platform.
PubMed: 36225055
DOI: 10.1364/OE.461877 -
British Medical Journal
Topics: Christianity; Conscience; Ethics, Medical; Morals; Social Responsibility
PubMed: 7448574
DOI: 10.1136/bmj.281.6256.1687 -
Optics Express Sep 2023Broadband supercontinuum laser sources in the mid-infrared region have attracted enormous interest and found significant applications in spectroscopy, imaging, sensing,...
Broadband supercontinuum laser sources in the mid-infrared region have attracted enormous interest and found significant applications in spectroscopy, imaging, sensing, defense, and security. Despite recent advances in mid-infrared supercontinuum laser sources using infrared fibers, the average power of those laser sources is limited to 10-watt-level, and further power scaling to over 50 W (or hundred-watt-level) remains a significant technological challenge. Here, we report an over 50 W all-fiber mid-infrared supercontinuum laser source with a spectral range from 1220 to 3740 nm, by using low loss (<0.1 dB/m) fluorotellurite fibers we developed as the nonlinear medium and a tilted fusion splicing method for reducing the reflection from the fluorotellurite-silica fiber joint. Furthermore, the scalability of all-fiber mid-infrared supercontinuum laser sources using fluorotellurite fibers is analyzed by considering thermal effects and optical damage, which verifies its potential of power scaling to hundred-watt-level. Our results pave the way for realizing all-fiber hundred-watt-level mid-infrared lasers for real applications.
PubMed: 37710636
DOI: 10.1364/OE.498183 -
Anaesthesia Oct 1997
Topics: Analgesia, Patient-Controlled; Humans; Pain, Postoperative; Patient Care Team
PubMed: 9370851
DOI: No ID Found -
Developmental Cell Sep 2016Mammalian epidermis is maintained through proliferation of stem cells and differentiation of their progeny. The balance between self-renewal and differentiation is... (Review)
Review
Mammalian epidermis is maintained through proliferation of stem cells and differentiation of their progeny. The balance between self-renewal and differentiation is controlled by a variety of interacting intrinsic and extrinsic factors. Although the nature of these interactions is complex, they can be modeled in a reductionist fashion by capturing single epidermal stem cells on micropatterned substrates and exposing them to individual stimuli, alone or in combination, over defined time points. These studies have shown that different extrinsic stimuli trigger a common outcome-initiation of terminal differentiation-by activating different signaling pathways and eliciting different transcriptional responses.
Topics: Animals; Cell Differentiation; Cell Engineering; Cellular Microenvironment; Epidermal Cells; Epidermis; Epithelial Cells; Humans; Signal Transduction; Single-Cell Analysis; Stem Cells
PubMed: 27676433
DOI: 10.1016/j.devcel.2016.08.010