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In this paper, a time reversal technique is proposed to enhance detection performance. When the time reversal technique is applied to the response of the clutter with strong time varying characteristic of shallow water, it is hard to obtain a high peak response. However, in the case that a cylindrical object is placed on the seafloor, However, in the case that a cylindrical object is placed on the...
This article presents a new water strider-like robot with buoyancy as the supporting force that is inspired by the water strider which can stand, glide and leap on the surface of water. The stroke mechanism of the robot has little disturbance to the water and is favorable for the stability of the water strider-like robot without extra action when it enters and leaves the water surface. Based on Interaction...
To guarantee the thermal safety and obtain good performance of a solid oxide fuel cell (SOFC), the operating temperature and temperature gradient of SOFC must be constrained within a proper range. Thus, it's important to obtain the spatial temperature distribution of SOFC in real time. However, the inner temperature of the fuel cell cannot be obtained by installing thermocouples with acceptable cost...
The aim of this research is developing a system that estimates the direction of users by attaching multiple antennas to users. We proposed the method of direction estimation using RSSI of multiple XBees antennas attached to the helmet as a wearable device. In this study, we used a bucket filled with water to simulate the human head and confirmed that direction estimation is sufficiently possible....
Common mode current suppression is important to grid-connected photovoltaic (PV) systems and depends strongly on the value of the parasitic capacitance between the PV panel and the ground. Some papers address that the parasitic capacitance of PV panel becomes larger in the humid environment. However, they do not give detailed explanation, and some give confusing address. This paper presents clarified...
SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. Under discharges, lower fluorides of sulfur generated by the dissociations of SF6 will react with unavoidable moisture and oxygen to form corrosive byproducts (etc., SOF2, SO2F2, SOF4). These byproducts will reduce the insulating and arc-quenching capacity of SF6 power equipment, so it is necessary to study their...
Water supply system has characteristics of non-linear, time-varying parameter, large time delay, so its mathematical model changes time by time. Water supply system widely use PID controller to keep constant pressure and PID controller need accurate mathematical model. The system that use PID controller is along with large overshoot, more adjusting time. Fuzzy controller don't need the accurate mathematical...
In the last decades the major interest topic is the usage of renewable energies and their adjustment in order to comply at an industrial scale in such manner that many technical domains can solve their waste problem in an environmental method. The biogas is well known as an important source of energy that can be used as a solution to wastes with high content of protein, which is the case of leather...
Deep learning (deep structured learning, hierarchical learning or deep machine learning) is a branch of machine learning based on a set of algorithms that attempt to model high-level abstractions in data by using multiple processing layers with complex structures or otherwise composed of multiple non-linear transformations. In this paper, we present the results of testing neural networks architectures...
The authors highlight that stationary condition monitoring systems for high-voltage equipment is an essential prerequisite of the Smart-Grid implementation in the industrial electric networks. Diagnostic systems commissioning is relevant for network and electric furnace transformers of iron and steel works. The system operation performance is deteriorated because of lack of the methods intended for...
By using first-principles calculations, the electronic properties and chemical activity of phosphorene under the strain and defect engineering are studied. Furthermore, the effects of engineering on the interactions of NO gas molecule and humidity (H2O) and air (O2) molecules with the phosphorene surface are investigated. It is found that phosphorene enables to withstand a large compressive strain,...
In Romania, there are two Natural Reservations Lakes Mangalia and Techirghiol with salt-water, near the Black Sea, which confront with new environmental problems. In the last decades appeared infiltration with fresh-water, due to the local earthquakes. As an immediate effect, new types of vegetation develop, leading to a complex eutrophication process. The appeared excessive sludge perturbs the ecologic...
This presents DC electrical characteristics and reliabilities of AlGaN/GaN metal-oxide-semiconductor heterojunction-field-effect transistors (MOS-HFETs) with HfO2 gate dielectric deposited by atomic layer deposition (ALD). Two types of oxidants were investigated, namely, water (H2O) and ozone (O3) for the ALD deposition. The comparison study reveals that GaN MOSHFETs with O3 oxidant results in overall...
This paper builds a SIMULINK model about the dynamic performance of the PEMFC System based on the basic mass transport theory and electrochemistry principles. This model integrates the dynamics process of GDL and membrane. Different from other models, considering the dynamics process in the GDL, catalyst oxygen concentration is directly used to describe the concentration overpotential, which is different...
This work investigates the changes in response to ozone and humidity of Atomic Layer Deposited (ALD) tin dioxide (SnO2) sensors operated at room temperature and integrated into a portable platform over several weeks. The impact of humidity is highlighted as it relates to immediate changes in ozone response and in slower changes where the history of exposure influences the surface kinetics while the...
Water occurring on earth has always been equipped with the characteristic of frequency dispersive permittivity at microwave frequency, which thus can be seen as a promising constituent material for broadband electromagnetic wave absorption. Here, we develop water as ultrathin dielectric substrate standing on the metal backplane to construct three-dimensional grid array, which can acquire broadband...
The basic features of some of the most versatile and popular open source frameworks for machine learning (TensorFlow, Deep Learning4j, and H2O) are considered and compared. Their comparative analysis was performed and conclusions were made as to the advantages and disadvantages of these platforms. The performance tests for the de facto standard MNIST data set were carried out on H2O framework for...
This paper reports the effect of water on AC breakdown properties of the vegetable-oil-based insulating fluid mixed with mineral oil. When we replace the mineral oil with the vegetable-oil-based insulating fluid in the high voltage electrical equipment, there are the concerns of containing residual mineral oil. It is called “retrofill”. We mixed the mineral oil into the vegetable-oil-based insulating...
The standard NASA atmospheric correction using near infrared bands (700 nm–900 nm) may work for clear to moderately turbid waters, but generally fails for extreme turbidities because of flattening of the water reflectance spectrum. The use of SWIR bands at 1.6 μm and/or 2.3 μm, such as the bands present on MODIS, can be effective in extremely turbid waters, but may not be present, such as in the case...
Recent advances in intelligent water meter technology have improved the quantitative monitoring in water supply and distribution. Smart meters using Automated Meter Reading (AMR) technology allowed water utilities to: i) provide clear consumption patterns which can help customers to track and control their water usage and ii) improve active leakage targeting and leak detection capability. This paper...
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