Effectiveness of Innovation Basic Life Support Training Devices to Layperson: A Randomized Controlled Trial

Objectives: The use of a cardiopulmonary resuscitation feedback device and automated external defibrillator trainer is beneficial in basic life support (BLS) training. Nevertheless, Thailand lacks these devices in BLS support training. This study aimed to compare the efficacy of the Chiang Mai BLS training devices with conventional training devices in BLS training for laypeople.Material and Methods: A randomized controlled trial was conducted to compare the efficacy of the Chiang Mai device group with the conventional device group, by assessing the theory and practical examination scores of the participants; who were adult, laypeople attending the BLS provider course endorsed by the Thai Resuscitation Council. Evaluating instructors were blinded from both groups of participants.Results: A total of 60 adult, laypeople participants were divided into two groups: 32 and 28 participants of the Chiang Mai device group and conventional device group, respectively. Overall examination scores of included participants were very high. The participants in the Chiang Mai device group had a higher median score of multiple-choice question assessment [9.0/9.0 (8.5-9.0) vs 8.5/9.0 (8.0-9.0) points, p-value=0.134] as well as a higher median score of practical examination [26.0/26.0 (24.3-26.0) vs 25.0/26.0 (24.0-26.0) points, p-value=0.278] when compared to those using conventional BLS training devices. However, there was no statistical significance between both groups.Conclusion: The effectiveness of the Chiang Mai BLS training device in basic life support training for adult laypeople is comparable to conventional BLS training devices.

Anti-$\mathcal{PT}$-symmetric Kerr gyroscope

Non-Hermitian systems can exhibit unconventional spectral singularities called exceptional points (EPs). Various EP sensors have been fabricated in recent years, showing strong spectral responses to external signals. Here we propose how to achieve a nonlinear anti-parity-time ($\mathcal{APT}$) gyroscope by spinning an optical resonator. We show that, in the absence of any nonlinearity, the sensitivity or optical mode splitting of the linear device can be magnified up to 3 orders than that of the conventional device without EPs. Remarkably, the $\mathcal{APT}$ symmetry can be broken when including the Kerr nonlinearity of the materials and, as the result, the detection threshold can be significantly lowered, i.e., much weaker rotations which are well beyond the ability of a linear gyroscope can now be detected with the nonlinear device. Our work shows the powerful ability of $\mathcal{APT}$ gyroscopes in practice to achieve ultrasensitive rotation measurement.

Inverted ternary OPD based on PEIE

This paper proposes an inverted ternary organic photodetector (OPD), whose structure is ITO/PEIE/PC61BM/P3HT:PCPDTBT/MoO3 /Al. The use of PEIE as the cathode buffer layer avoids the influence of acidic PEDOT:PSS on the surface and life of the conventional device . The preparation of the ternary active layer ensures the photoelectric characteristics of the device in the visible-infrared broad spectrum range. In this experiment, the effect of PEIE thickness on the working mode of the device was studied by changing the concentration of the spin-coated PEIE solution. Finally, when the solution of PEIE is less than 0.45wt%, the device works in the diode mode, on the contrary, it works in the photoconductive mode. And under 550nm illumination (optical power 4.02mW/cm2) , the device achieves a responsivity of 1.64A/W and an external quantum efficiency of 370%.

Enhancement of Breakdown Voltage in SOI MOSFET Using Buried p-Type Silicon

Semiconductor industry is still looking for the enhancement of breakdown voltage in Silicon on Insulator (SOI) Metal Oxide Semiconductor Field Effect Transistor (MOSFET). Thus, in this paper, heavy n-type doping below the channel is proposed for SOI MOSFET. Simulation of SOI MOSFET is carried out using 2D TCAD physical simulator. In the conventional device, with no p-type doping is used at the bottom silicon layer. While, in proposed device, p-type doping of 1×1018 cm-3 is used. Physical models are used in the simulation to achieve realistic performance. The models are mobility model, impact ionization model and ohmic contact model. Using TCAD simulation, electron/hole current density, impact generation, recombination and breakdown phenomena are analyzed. It is found that the proposed with p-type doping of 1×1018 cm-3 for SOI MOSFET yields high breakdown voltage. In contrast to conventional device, 20% improvement in breakdown voltage is achieved for proposed device.

CISOL: el dispositivo de cierre para sonda nasogástrica tipo Levin, en un estudio aleatorio controlado que evalúa su efectividad y seguridad

Background: The Levin-type nasogastric tube is indicated for gastric decompression, but due to its economic cost it is used to feed and administer medications in patients who cannot do it by themselves; its proximal end does not have a closure system. The study determined the effectiveness and safety of a device (Cisol), specially created for the proximal closure of the Levin-type nasogastric tube for adults compared to the conventional device (syringe). Methods: Study of experimental design, randomized of preventive type applied outside the clinical context, through which the effectiveness and safety of both devices were estimated and compared taking into account as markers: their weight, size and shape. Results: According to the evaluation of the participants, Cisol is considered effective and safe for the proposed purposes since its weight, size and shape would significantly favor patient comfort and handling compared to the syringe. Conclusions: The new CISOL design is safe to use, and has the potential to reduce risks related to traction and overweight at the proximal end of the probe, as well as contributing to patient comfort. The effectiveness and safety of the CISOL device differs from the effectiveness and safety of the conventional device (syringe) used to close the Levin catheter.

Usability Evaluation of Slanted Computer Mice

Prevention of musculoskeletal disorders is supported by use of slanted rather than horizontal pointing devices, but user acceptance of the former may be compromised due to lower perceived ease of use. This study compares subjectively rated usability (N = 37) for three sizes of slanted computer mice and includes a horizontal small conventional device as a reference. For a random subset of the sample (n = 10), objective usability parameters were also elicited. Participants followed a standard protocol which is based on executing graphical pointing, steering, and dragging tasks generated by a purpose-built software. Subjective ratings were collected for each of the four pointing devices tested. The three slanted devices differed in size but were chosen because of an approximately similar slant angle (around 50–60 degrees relative to the horizontal plane). Additionally, effectiveness and efficiency were objectively calculated based on data recorded for the graphical tasks’ software for a random subset of the participants (n = 10). The results unveil small differences in preference in some of the subjective usability parameters across hand size groups. This notwithstanding, the objective efficiency results are aligned with the subjective results, indicating consistency with the hypothesis that smaller slanted devices relative to the user’s hand size are easier to use than larger ones. Mean values of weighted efficiency recorded in the study range from 68% to 75%, with differences across devices coherent with preference rank orders.

Efficient Inverted Solar Cells Using Benzotriazole-Based Small Molecule and Polymers

We synthesized medium-band-gap donor-acceptor (D-A) -type conjugated polymers (PBTZCZ-L and PBTZCZ-H) consisting of a benzotriazole building block as an acceptor and a carbazole unit as a donor. In comparison with the polymers, a small conjugated molecule (BTZCZ-2) was developed, and its structural, thermal, optical, and photovoltaic properties were investigated. The power conversion efficiency (PCE) of the BTZCZ-2-based solar cell devices was less than 0.5%, considerably lower than those of polymer-based devices with conventional device structures. However, inverted solar cell devices configured with glass/ITO/ZnO:PEIE/BTZCZ-2:PC71BM/MoO3/Ag showed a tremendously improved efficiency (PCE: 5.05%, Jsc: 9.95 mA/cm2, Voc: 0.89 V, and FF: 57.0%). We believe that this is attributed to high energy transfer and excellent film morphologies.

Aerodynamic Analysis of Rear Diffusers for a Passenger Car Using CFD

Increasing environmental pollution and fuel prices are the driving forces for automotive manufacturers to develop energy efficient vehicles with lower emissions. Improving the aerodynamic characteristics and reducing the aerodynamic drag resistance of a car is the easiest and cost efficient way to handle this problem. A conventional device to improve the aerodynamics that is used on sports and racing cars is a diffuser which improve the pressure recovery on the underbody. In this study, the drag reduction effect of a diffuser has been studied on a sedan car. To understand the effects of the diffuser, computational fluid dynamics (CFD) simulations has been performed. In these simulations, diffusers with different angles were simulated to find most effective drag reduction configuration. Analyses have shown that, it is possible to improve the aerodynamic characteristics by implementing diffusers at the vehicle’s underbody.

III-Nitrides Resonant Cavity Photodetector Devices

III-nitride resonant cavity-enhanced Schottky barrier photodetectors were fabricated on 2 µm thick GaN templates by radio frequency plasma-assisted molecular beam epitaxy. The optical cavity was formed by a bottom distributed Bragg reflector based on 10 periods of Al0.3Ga0.7N/GaN, an Au-based Schottky contact as top mirror, and an active zone of 40 nm-thick GaN layer. The devices were fabricated with planar geometry. To evaluate the main benefits allowed by the optical cavity, conventional Schottky photodetectors were also processed. The results revealed a planar spectral response for the conventional photodetector, unlike the resonant devices that showed two raised peaks at 330 and 358 nm with responsivities of 0.34 and 0.39 mA/W, respectively. Both values were 80 times higher than the planar response of the conventional device. These results demonstrate the strong effect of the optical cavity to achieve the desired wavelength selectivity and to enhance the optical field thanks to the light resonance into the optical cavity. The research of such a combination of nitride-based Bragg mirror and thin active layer is the kernel of the present paper.