Low-cost Delivery and Telepresence Robot for COVID-19 Crisis

Purpose: The ongoing COVID-19 crisis has created the need for social distancing between medical staff and patients, therefore, healthcare robotics is increasingly important as regards infectious control. The purpose of this study was to design and fabricate a remote controlled transport robot that could provide an optimum technology base for developing countries, having dual functions of telepresence and delivery operations inside or outside buildings, is easy to assemble and also easily able to be cleaned using standard chemical agents.Methods: This machine was designed and fabricated to incorporate two main functions; delivery and telepresence. The robot consists of a base frame, DC motors for driving and steering systems, actuator motor for driving wheel elevation, Wi-Fi AP/Repeater, network camera, and a necessary a back-up power system.Results: This robot can be used both indoors and outdoors. It can carry loads of more than 80 kg. The machine can cross obstacles greater than 3 cm. It can be cleaned by disinfectant agents. An actuator motor can lift the driving wheels above the surface to prevent gear damage. Conclusion: This article demonstrates the concept of a healthcare telepresence and delivery robot that can provide distancing during the present COVID-19 crisis, using optimum technology for low and middle-income countries. In the future, the researcher should consider development of the delivery controls, combined with the telepresence system using the internet of things, to improve the navigation system, the manipulator system for supporting multi-floor transportation, and also other multi-functional purposes.

Optimization of the Isothermal Forging Process of a Spur Bevel Gear

In this paper, the optimization of the parameters of the isothermal forging technology to form spur bevel gear was studied. The goal of the optimization is to decrease the forming load during the process. Then, some factors included the ratio of height to diameter of billet, thickness and position of punching recess, deformation temperature and velocity were taken as the optimization values and the orthogonal experimental method was employed to carried out the optimization. After the optimization, a set of optimum technology parameters were obtained. The result demonstrates that the precise spur bevel gear can be formed with less forming load and without causing under-filling and folding defect by using the isothermal forging and choosing suitable parameter, which provides reference to form the spur bevel gear.

The Preparation of ZrO2 and the Influence of the Calcination Temperature

nanoZrO2ceramic powders have excellent properties in many field. In order to obtain nanoZrO2powder with excellent properties, the study of preparation methods become a hotspot. The nanoZrO2powders new preparation technology from cheap raw materials is target of this paper. nanoZrO2powers were preparated from ZrOCl2and NaCO3as raw material. The optimum technology parameters were determined as follow, namely at 40°C, C (ZrOCl2) =0.4mol/L, C (NaCO3) =1.0mol/L, 2% the surface activity agent. nanoZrO2powders preparated were characterized by XRD, TEM and Electron Diffraction . The results show that the ZrO2powders prepared are crystal and the sizes are nanometer. The ZrO2average sizes were calculated with the scherrer formula. The nanoZrO2sizes change with temperature was discussed. The result is ageerment with that calculated with the scherrer formula.

The Effect of Laser Power Density on Laser Covered Graphene

Laser reduction is a facile method for the synthesis of laser converted graphene from graphite oxide (GO) The laser power density of semiconductor laser can effect on the reduced graphene quality. The research on relationship between laser power density and reduction of graphene oxide can help to determine the optimum technology parameter in the synthesis of laser covered graphene.

Study on Synthesis of Polyether-Modified Polysiloxane

Polyether-modified polysiloxane was synthesized by hydrosilylation, using allylic alcohol polyether and polysiloxane as materials, toluene as solvent and chloroplatinic as catalyst. The effect of technology conditions on conversion rate of hydrogenous silicone oil was discussed and chemical structure of product was characterized. The results show that the optimum technology is: the reaction temperature is 95°C, time is 5h, the molar ratio of polysiloxane to polyether is 1:1.2, the dosage of catalyst is 30ug/g and the mass fraction of the toluene is 25% of the system.

The Technological Study about Cutting Stainless Substrate by Nd:YAG Laser

Cutting stainless substrate by Nd:YAG laser processor, researching the effect of technological parameters on fringe frequency and hang slag. To research the effect on cutting quality which was made by laser cutting technological parameters and find out the optimum technology parameters of laser cutting by using orthogonal experiment.

The Process Discussion of the Nanosilver Finished Silk Fabric in the Light of In Situ Methanism

In order to improve the antibacterial property of silk fabric, nano-silver was used to deal with the silk fabric by steaming in the light of in-situ methanism. All of the factors which affect the content of nanosilver and the whiteness of the finished silk were studied. These factors are the concentration of RSD solution, the concentration of silver nitrate solution, the steaming temperature and the dipping time. The optimum technology obtained was showed as follows: the silk fabric should be treated with the concentration of 2g/L RSD and the concentration of 0.085g/L silver nitrate, and steamed for 30 minutes after dipped for 5 minutes. The results of the inhibition zone test and the antibacterial rate test indicated that both the silk fabric finished by the optimum technology and the one settled by five times diluted optimum technology showed highly antibacterial property. Even if the solutions are diluted by 5 times, the antibacterial rate of finished fabric is up to 99.67% to Staphylococcus aureus and 99.99% to Escherichia coli. Meanwhile, the inhibition zone is 7.9mm to Staphylococcus aureus and 8.3mm to Escherichia coli. In addition, the whiteness of the finished fabric was changed a little.