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In this paper, finite element method (FEM) simulations are carried out with pillar-concave structure using silicon substrate, silicon substrate with polyimide (PI) and with polybenzoxazole (PBO) for realization of Cu-Cu bonding at low temperature. Parameters of bonding temperature, pillar diameter, concave sidewall angle, and multilayer of concave structure are all considered in simulation. In addition,...
We have been developing insulation design techniques based on an equivalent circuit to predict the voltage distribution of the stator coil end of high-voltage inverter-fed electrical machines. A new equivalent circuit was proposed by applying additional modeling of cover insulation, the corona protection shield, and measurement circuits to the conventional equivalent circuit for mains-fed electrical...
Military vehicles have to meet requirement of mobility. Vehicle capability to overcome heavy terrain (mud, snow, etc.) and terrain obstacles increase vehicle survivability in a battlefield. Experiments, field tests and operation data mining are common manners for vehicle mobility evaluation and dependability prediction, yet current military vehicles of Czech armed forces have small value of driven...
A 3D-FEM model has been developed to improve the understanding of multi-parameter sensing with Bragg gratings in attached or embedded polarization maintaining fibers. The material properties of the fiber, especially Young's modulus and Poisson's ratio of the fiber's stress applying parts, are crucial for accurate simulations, but are usually not provided by the manufacturers. A methodology is presented...
The mechanism of wheel corrugation for high speed railway was studied by both experiment and simulation methods. Based on Hertz rolling contact theory, a friction and wear experiment platform for wheel/rail contact was built. The experiments of wheel/rail contact were performed under pure rolling condition. Corrugations of wheel specimen after different rotations were observed and analyzed. On the...
This paper analyzed four different structures of flow sensor, the rectangular membrane cantilever beam array structure, the trapezoidal membrane cantilever beam array structure, the inverted trapezoidal membrane cantilever beam array structure and the triangular membrane cantilever beam array structure. The numerical and simulation results show that the inverted trapezoidal membrane cantilever beam...
As memory technology scales down, memory cells tend to become unreliable. To guarantee reliable operations of circuits and systems, semiconductor devices are tested with accelerated life tests to estimate device-level reliability and to develop a predictive reliability model for circuits and systems based on the estimated reliability of devices. However, to accurately estimate the lifetime of a system,...
Since memory cells tend to become more unreliable as technology scales down, to guarantee reliable operations of circuits/systems, prior to committing a design to manufacturing we need to accurately estimate the lifetime of a memory system by considering system usage. We propose to estimate the lifetime of a memory system using system-level accelerated life tests, where failures are detected with...
This paper presents a single-stage non-isolated modified multiplier SEPIC converter for high voltage gain. The modified and multiplier technique reported in the literature are used to conventional SEPIC converters to obtain high voltage gain and low voltage stress across the switch. The proposed topology combines merits of both of these techniques simultaneously in the SEPIC converter to evolve a...
An important topic in cybersecurity is validating Active Indicators (AI), which are stimuli that can be implemented in systems to trigger responses from individuals who might or might not be Insider Threats (ITs). The way in which a person responds to the AI is being validated for identifying a potential threat and a non-threat. In order to execute this validation process, it is important to create...
In This paper we are presenting a bidirectional DC-DC converter is also known as dual active bridge (DAB) dc-dc converter. We presented a Z-source with bidirectional dc-dc converter by reducing the switching count by adding the passive elements we are improving the output voltage level, Comparing with the traditional bidirectional dc-dc converter, the proposed converter has an wider regulation range...
The structure design that only by traditional statics calculating procedure for large amusement equipment is not accurate. It must be combined with the kinetic parameters to find the most dangerous working conditions, and then make optimization design for meet safety standards. This paper is studied by taking “self-control plane” amusement equipment cantilever beam as the research object, using the...
With joint simulation of the COSMOSMotion and COSMOSWorks, dynamics simulation and kinematics simulation of the main working device of multi-purpose vehicle are conducted under the three typical operating modes (i.e., excavating with the bucket, the bucket rod or both). Compared with the physical prototype experimental data, the results demonstrate rationality and correctness of the virtual design...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
Plants may encounter drought stress frequently during their life cycles. In-depth studies of dynamic changes of stomatal conductance (Gs) under drought stress have important significance for understanding plant transpiration and fruit orchard irrigation. By constructing a photosynthesis-stomatal conductance-transpiration coupled model, the Gs dynamic changes of potted apple tree leaves under drought...
A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for floating gate driver. In addition, the voltage stress of one of the switches is lower than the existing quadratic...
The centrifugal blood pump is mostly used in medical field. The ventricular assist devices (VADs) based on CBPs become famous modality for treatment heart failure's patients. However, The CBP has reported that cause of hemolysis and thrombosis in long term used. So, CBP factors that cause of both hemolysis and thrombosis is relating with shear stress at internal surface of CBP; High shear stress cause...
Cascaded multilevel inverters are widely used in various fields, from oil and gas, power supply installations, to power quality devices. While there are many advantages of the cascaded multilevel inverter such as low voltage stress for each switching device and higher power quality, the main downside for this type of inverter is relatively large number of switching device it needs in an installation...
The wafer-level package (WLP) was popularized to develop for mobile phones, tablets, portable players, wearable and IOT devices to fit small form factor and low profile benefits. Currently, WLP was demanded to increase I/O density and performance into applications with higher levels of integration. In order to develop the need for an evolution in functionality of WLP technology, WLP would suffer potential...
The transformer is the most important electrical power system equipment used to transmit and distribute the electricity. The bushings are among the vital accessories components in the transformer because of the different defects which can be produced in this part. The aim of the present work is to diagnose the different defects in an electrical transformer bushings based on the dissolved gas analysis...
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