An Evidence review of Face Masks against Covid-19

The technology round the usage of mask with the aid of using the general public to hinder COVID-19 transmission is advancing rapidly. In this narrative overview, we expand an analytical framework to study masks utilisation, synthesising the applicable literature to tell more than one areas: populace impact, transmission characteristics, supply control, wearer protection, sociological considerations, and implementation considerations. A number one direction of transmission of COVID-19 is thru breathing debris, and it's far recognised to be transmissible from presymptomatic, paucisymptomatic, and asymptomatic people. Reducing ailment unfold calls for things: proscribing contacts of inflamed people thru bodily distancing and different measures and lowering the transmission chance according to touch. The preponderance of proof shows that masks sporting reduces transmissibility according to touch with the aid of using lowering transmission of inflamed breathing debris in each laboratory and medical contexts. Public masks sporting is handiest at lowering unfold of the virus whilst compliance is high. Given the modern shortages of clinical mask, we advise the adoption of public material masks sporting, as a powerful shape of supply control, along with present hygiene, distancing, and make contact with tracing strategies. Because many breathing debris turn out to be smaller because of evaporation, we advise growing awareness on a formerly unnoticed component of masks utilisation: masks sporting with the aid of using infectious people (“supply control”) with blessings on the populace level, in preference to simplest masks sporting with the aid of using inclined people, which include fitness care workers, with awareness on person outcomes. We advise that public officers and governments strongly inspire the usage of extensive face mask in public, which include the usage of suitable regulation. Policy makers want pressing steering on the usage of mask with the aid of using the overall populace as a device in preventing extreme acute breathing syndrome coronavirus 2 (SARS-CoV-2), the breathing virus that reasons COVID-19. Masks were encouraged as an ability device to address the COVID-19 pandemic for the reason that preliminary outbreak in China (1), even though utilisation all through the outbreak numerous with the aid of using time and location (2). Globally, nations are grappling with translating the proof of public masks sporting to their contexts. These guidelines are being evolved in a complicated decision-making environment, with a unique pandemic, speedy technology of recent research, and exponential boom in instances and deaths in lots of regions. There is presently an international scarcity of N95/FFP2 respirators and surgical mask to be used in hospitals. Simple material mask gift a practical answer to be used with the aid of using the general public. This has been supported with the aid of using maximum fitness bodies. We gift an interdisciplinary narrative overview of the literature at the position of face mask in lowering COVID-19 transmission with inside the community. Keywords: COVID, ECONOMY, MASKS, LIVES, SAFETY, FUTURE

ADOBE FLASH MEDIA LEARNING ENGLISH THROUGH E-LEARNING SYSTEM IN UNIVERSITY OF MUHAMMADIYAH SUMATERA UTARA

<p>The Objective of study is to find the result of the learning process of Adobe Flash as media on the course of <em>Pengembangan Media Pembelajaran </em>through E-Learning system at English education study program in University of Muhammadiyah Sumatera Utara. E-learning provides a set of tools to enrich the value of conventional learning model, studies of textbooks, CD-ROMs, and computer-based training. Students can answer the challenges of globalization. Research Method used descriptive method through qualitative approach. Method of research conducted qualitative. Sample of research were forth semester students of English education study program. E learning system of UMSU provided schedule of course, attendance check, discussion forum between a lecture and students, task file, exercises file integrated Moodle and google form, module e book of <em>Pengembangan Media Pembelajaran</em>, slide file presentation, all activities viewed past, present and future time. Adobe flash media learning English implemented by virtual for one semester. The students can be active teaching English using Adobe Flash, simple material for presentation. They were enthusiastic when learn Adobe flash as media leaning English.</p>

Greening the Desert While Helping Business and Caring for the Environment

This paper describes the utilization of produced and treated formation water for planting trees and growing algae in large ponds; in a massive scale in South Oman. A detailed study has been carried out to assess the injection requirements for pressure maintenance in the producing reservoir and using the remaining excess pot-treated water for farming of the palm trees. The produced water has been used as disposal in formations deeper than the producing horizons in the past. The produced water was separated in a processing station that received gross production from a number of fields in South Oman. This water was disposed in the aquifer underlying a producing reservoir that has experienced pressure maintenance due to this disposal. The impact of this excess water disposal on the aquifer was studied to evaluate the risk of breaching cap rock integrity. The risk was not significant but to ensure "no damage to the environment and people" it was decided to reduce or optimize injection rates to maintain the reservoir pressure safeguarding reserves. In addition, the disposal of the water required significant amount of power equivalent to emitting significant amount of CO2 annually just for water disposal. The study was carried out using simple material balance methods to predict the pressure behaviour given an injection profile. The recommendations from the study have already been implemented to convert the deep-water disposal to injection in the aquifer. This has been achieved by the integration of number of interfaces from sub-surface to field operations. All the pieces are in place to take it the next level of execution that is to treat the water at surface for oil removal, hence rendering the water at acceptable quality levels for tree plantation and algae ponds. The project also aims in a future second phase to further treat the water to higher specifications allowing the use of it for agricultural purposes. This would introduce a commercial farm that will depend on this source of water. This would be a novel concept in South Oman where the treated water will be used for farming solving multiple issues at multiple levels namely helping the business achieve its objective of sustained oil production, helping local communities with employment via farming and helping the organization care for the environment by reducing carbon footprints.

Numerical Analysis of Oxygen-Related Defects in Amorphous In-W-O Nanosheet Thin-Film Transistor

The integration of 4 nm thick amorphous indium tungsten oxide (a-IWO) and a hafnium oxide (HfO2) high-κ gate dielectric has been demonstrated previously as one of promising amorphous oxide semiconductor (AOS) thin-film transistors (TFTs). In this study, the more positive threshold voltage shift (∆VTH) and reduced ION were observed when increasing the oxygen ratio during a-IWO deposition. Through simple material measurements and Technology Computer Aided Design (TCAD) analysis, the distinct correlation between different chemical species and the corresponding bulk and interface density of states (DOS) parameters were systematically deduced, validating the proposed physical mechanisms with a quantum model for a-IWO nanosheet TFT. The effects of oxygen flow on oxygen interstitial (Oi) defects were numerically proved for modulating bulk dopant concentration Nd and interface density of Gaussian acceptor trap NGA at the front channel, significantly dominating the transfer characteristics of a-IWO TFT. Furthermore, based on the studies of density functional theory (DFT) for the correlation between formation energy Ef of Oi defect and Fermi level (EF) position, we propose a numerical methodology for monitoring the possible concentration distribution of Oi as a function of a bias condition for AOS TFTs.

Optimized design for illusion device by genetic algorithm

The illusion device developed from the scattering cancellation employs very simple homogeneous and isotropic materials, but this device is only valid for electrically small objects. In this paper, we prove that the illusion device optimized by genetic algorithm can be applied to large-scale occasions. For an electrically small target, an optimized core–shell illusion device can achieve better illusion effect than the analytical design based on the scattering cancellation. With the increase of the device size, the ability of the single-layered shell to manipulate the scattering is very limited. For a moderate-size target, two optimized multi-layered examples are presented: one is to make a dielectric cylinder appear as another dielectric target, and the other is to make a conducting cylinder behave like a double-negative-material target. The full-wave simulations are carried out to visualize the similar field distributions of the target and the optimized multi-layered design. This optimized design greatly widens the size application range of the illusion device and can also improve the illusion performance with simple material parameters.

Dandelion pappus morphing is actuated by radially patterned material swelling

Plants can generate motion by absorbing and releasing water. Such motion often facilitates reproductive success through the dispersal of seeds and fruits or their self-burial into the soil. Asteraceae plants, such as the dandelion, often have a hairy pappus attached to their fruits to allow them to fly and in many cases, these can open and close depending on moisture levels to modify dispersal. Here we demonstrate the relationship between structure, composition and function of the underlying hygroscopic actuator. By investigating the structure and properties of the actuator cell walls we have identified the mechanism by which the dandelion pappus closes and developed a structural computational model that can capture observed pappus closing. This model was used to explore the contribution of differential material domains in the actuator function and the critical design features. We find that the actuator relies on the radial arrangement of vascular bundles and surrounding tissues including cortex and the floral podium around a central cavity. This allows heterogeneous swelling in a radially symmetric manner to co-ordinate precise movements of the pappus hairs attached at the upper flank. This actuator is a derivative of bilayer structures, but is radial and can synchronise the movement of a planar or lateral attachment. The simple, material-based mechanism presents a promising biomimetic potential in robotics and functional materials.

Role of nanoparticles in achieving macroscale superlubricity of graphene/nano-SiO2 particle composites

Recent studies have reported that adding nanoparticles to graphene enables macroscale superlubricity to be achieved. This study focuses on the role of nanoparticles in achieving superlubricity. First, because graphene nanoscrolls can be formed with nanoparticles as seeds under shear force, the applied load (or shear force) is adjusted to manipulate the formation of graphene nanoscrolls and to reveal the relationship between graphene-nanoscroll formation and superlubricating performance. Second, the load-carrying role of spherical nano-SiO2 particles during the friction process is verified by comparison with an elaborately designed fullerene that possesses a hollow-structured graphene nanoscroll. Results indicate that the incorporated nano-SiO2 particles have two roles in promoting the formation of graphene nanoscrolls and exhibiting load-carrying capacity to support macroscale forces for achieving macroscale superlubricity. Finally, macroscale superlubricity (friction coefficient: 0.006–0.008) can be achieved under a properly tuned applied load (2.0 N) using a simple material system in which a graphene/nano-SiO2 particle composite coating slides against a steel counterpart ball without a decorated diamond-like carbon film. The approach described in this study could be of significance in engineering.

Comparative study on biosorption of arsenite ions onto raw and chemically activated orange peel powder in batch reactor

In present work, comparative study of sorption potential of raw and chemically activated orange peel powder has been explored for the removal of arsenite ions (As III) from wastewater. Several operating parameters such as contact time, adsorbent dose, adsorbate ion concentration, solution pH as well as temperature were studied in batch reactor. Surface as well as physicochemical analysis of orange peel was done by using FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning Electron Microscopy), proximate and ultimate analysis. Maximum removal of As (III) 86.3% and 87% was obtained at initial metal ion concentration 20 mg/l and 25 mg/L, optimum pH 2 and 2.8, temperature 30°C and 25°C, contact time 120 and 150 minutes as well as the adsorbent dose 4g for raw and chemically activated orange peel respectively. Modeling of experimental data showed that Freundlich model (R2 = 97.45) had a better fit over Langmuir isotherm (R2 = 96.33) for raw orange peel and the Freundlich model (R2 =99.8%) in comparison to Langmuir model (R2 =94.5%) shows better fit. The present comparative study depicts that the chemically activated orange peel powder are more effective than raw orange peel powder. Thus, orange peel is found to be promising simple material for removal of arsenite ions (As III) ions.

Grasping with kirigami shells

The ability to grab, hold, and manipulate objects is a vital and fundamental operation in biological and engineering systems. Here, we present a soft gripper using a simple material system that enables precise and rapid grasping, and can be miniaturized, modularized, and remotely actuated. This soft gripper is based on kirigami shells—thin, elastic shells patterned with an array of cuts. The kirigami cut pattern is determined by evaluating the shell’s mechanics and geometry, using a combination of experiments, finite element simulations, and theoretical modeling, which enables the gripper design to be both scalable and material independent. We demonstrate that the kirigami shell gripper can be readily integrated with an existing robotic platform or remotely actuated using a magnetic field. The kirigami cut pattern results in a simple unit cell that can be connected together in series, and again in parallel, to create kirigami gripper arrays capable of simultaneously grasping multiple delicate and slippery objects. These soft and lightweight grippers will have applications in robotics, haptics, and biomedical device design.