Design And Development Of An External Glass Wall Cleaning System

The increasing number of skyscrapers calls for an increasing demand for regular maintenance and cleaning of the large glass panes or windows of these buildings. Cleaning these windows, is not only tough and a risky job but also time consuming. Thus, an effort has been made to introduce a new system which not only reduces the human effort but also aims in cleaning the windows effectively as well as efficiently. This project aims to produce a clean view through the windows which helps in maintaining the aesthetic view of the building. This device can be used periodically for efficient cleaning of the external glass walls, as there is no involvement of a human being suspended from the top of the building. The Current device can be used as a replacement for an existing method in order to ensure safety of the workers.

The Resistive Ground Fault of PWM Voltage Inverter In The EV Charging Station

During the direct touch of the inverter output voltage, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 kHz and 16 kHz, flow via a human’s body. Here was proved that Residual Current Device (RCD) type AC/IΔn = 30 mA does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs. Because RCDs do not disconnect the power supply, the touch on the inverter’s voltage is dangerous to the health and life. For the authors, RCD usage in Voltage Frequency Converters is not a good engineer practice. The article presents tests of RCD operation in the event of a ground fault during EV battery charging.

Considerations for Translating Medical Devices Under Development From the Clinic to the Home: A Case Study in Providing Chronic Wound Care

A prototype medical device and protocol that work well in a clinic would not necessarily work reliably in the home setting. The goal of this work is to identify factors to consider when translating a device evaluated in a clinic for use by home caregivers providing chronic wound care for persons living with dementia. One must consider the current device, the associated bundle, the protocol and how they may need to be modified. Semi-structured interviews with the research assistants who have applied a prototype device were conducted to generate a list of known issues with the current clinical protocol in terms of ultrasound application The researchers performed a set of specified tasks by following the current device protocol and explaining any difficulties with use\execution. They embellished the descriptions with details about what had happened with actual patients in the clinic. Using thematic analysis, analysts identified themes and subthemes. Issues potentially relevant to translating medical devices to the home are discussed.

Regarding Toxin Detection Mechanisms for Harmful Algae Blooms and Current Device Apparatuses or Development

Current toxin detection mechanisms are insufficient in comparison to a software defined networking system with P2P compatibility in regards to real time detection. In regards to current mechanisms, this involves both wet chemical as well as physical devices and/or buoys. The introduction of new technologies in regards to network latency in relation to novel detection methods is what will be the cornerstone of this research. The importance of this field is to draw conclusions in regards to technological implementations in relation to detection, time, network latency and quality of the data.

Вихретоковый контроль усталостной деградации метастабильной аустенитной стали при гигацикловом контактно-усталостном нагружении

The surfaces of parts made of austenitic chromium-nickel steels are subjected to heavy cyclically repeated contact loads, including impact loads, during operation. Therefore, the study of contact endurance and the development of methods for non-destructive testing of fatigue degradation of such steels is a relevant task. The aim of this work is to study the possibility of eddy-current testing of the fatigue degradation of the AISI 321 steel under contact loading. Mechanical testing for gigacycle contact fatigue has been conducted in accordance with the pulsing impact “plane-to-plane” contact scheme with an ultrasonic loading frequency. It has been shown that eddy-current testing of the fatigue degradation under contact loading of the AISI 321 steel is possible, but has certain limitations due to non-monotonic changes in the eddy-current device readings α depending on the number of loading cycles. Along with this, using the ascending branch it is possible to test the degree of failure of the surface layer, taking into account in the control technique the ambiguous character of the dependences of the eddy-current device readings on the number of loading cycles. The testing can be performed by measuring the eddy-current device readings at the excitation frequency of the eddy current probe f = 124 kHz. In this case, mainly surface layers are analyzed, where the processes of the fatigue degradation that affect the physical characteristics of the steel are developed intensively. The greatest influence on the value of α is exerted by the quantitative ratio of austenite to strain-induced martensite in the control zone.

Environment-driven Communication in Battery-free Smart Buildings

Recent years have witnessed the design and development of several smart devices that are wireless and battery-less. These devices exploit RFID backscattering-based computation and transmissions. Although singular devices can operate efficiently, their coexistence needs to be controlled, as they have widely varying communication requirements, depending on their interaction with the environment. The design of efficient communication protocols able to dynamically adapt to current device operation is quite a new problem that the existing work cannot solve well. In this article, we propose a new communication protocol, called ReLEDF, that dynamically discovers devices in smart buildings and their active and nonactive status and when active their current communication behavior (through a learning-based mechanism) and schedules transmission slots (through an Earliest Deadline First-- (EDF) based mechanism) adapt to different data transmission requirements. Combining learning and scheduling introduces a tag starvation problem, so we also propose a new mode-change scheduling approach. Extensive simulations clearly show the benefits of using ReLEDF, which successfully delivers over 95% of new data samples in a typical smart home scenario with up to 150 heterogeneous smart devices, outperforming related solutions. Real experiments are also conducted to demonstrate the applicability of ReLEDF and to validate the simulations.

Polymer Optical Fiber Splitter Using Tapered Techniques for Green Technology

Polymer Optical Fiber is opted as the most suitable medium for short haul communication system since it has lower cost and low loss for limited distance of transmission compared to glass fiber. This topic aims to show an alternative, green-technology based, economic and user-oriented communication passive device specifically a directional coupler by lapping tapered-fibers technique. This developed device is using designed geometrical blocks with integration of tapering effect, Dc, macro-bending, Rc, force exertion unto the coupling region, Fc, and etching lengths of the cores, Le to gain different splitting ratios, i.e., 50:50 and 90:10 experimentally by using the designed geometrical blocks with varied bending radii that affects the radiation of evanescent wave and to relate the integration of Couple Mode Theory and Hertz’s Law to obtain optimum coupling efficiency. The development may be an option to current device that are less user-friendly and fragile. This device is developed as a green technology-based device as an option for higher speed communication devices since the materials using in the development is safe, harmless, and inexpensive.

Fringe Science

The Colmascope and the Polariscope are devices consisting of polarizers oriented with their polarization axes normal to each other andwith a gap between them that allows one to place objects in the gap in order to observe birefringence. It is useful for detecting stresses in glass and plastic, for identifying and orienting crystals, and for determining uniformity of transparent materials. The modern device uses two sheets of flat polarizing material. But the device predates George Eastman’s invention of Polaroid sheet. How did they use crossed polarizers before that time, and how did that differ from the current device? And what are Landolt fringes?

Intelligent power equipment identification model based on grid topology analysis

With the continuous development of the power grid, power equipment becomes more complex and diverse, which has increased the workload of power maintenance personnel. This paper proposes a method of intelligent identification of distribution network equipment to reduce the power maintenance personnel's workload. The model needs device photos, GPS coordinates, and device topology information of the entire power grid to infer the possible situation of the current device. The model is mainly divided into two parts: target recognition and equipment prediction. In target recognition, we propose a Self-attention target detection network (SA-TDN) that combines Faster-RCNN and Attention mechanism. In equipment prediction part, we use KD-Tree to analyse the grid topology to predict the real identification of the device. We compared this model with other convolutional neural networks (CNN) classification models. The results show that our model is ahead of current models in prediction accuracy.