RBF Model for the Mass Loss of a Brass in Cavitation Field

This article aims at presenting the model of the mass loss of a brass sample in ultrasonic cavitation field in saline water. The experiments done for data collecting was performed in three scenarios. In the first one, the high frequency generator worked at three power levels - 80 W, at the second one - at 120 W, and in the third one - at 180 W. The Model has been built using the series of the mass loss on surface.

On the Corrosion of Two Types of Bronzes Under Cavitation

This article contains the results of the experiments concerning the mass loss of two types of bronze in seawater in the cavitation produced by ultrasound generated by a high-frequency generator. The mass loss models are presented for the experimental conditions when the generator worked at different powers - 80 W, 120 W, and 180 W. In all scenarios, the results show that the bronze with Sn has the highest mass loss in the cavitation field.

Experimental studies of the components of high-frequency ion engine RD0310

Testing of prototypes of equipment is the most important stage of their development. The article considers a low-power high-frequency ion engine RD0310 which was manufactured and tested at the production base of the KBHA joint-stock company. The tests were carried out in a vacuum chamber with a volume of 5.66 m3, the vacuum pumping system of which allows for a pressure inside the chamber of no more than 110-5mm Hg. with xenon consumption of up to 0.7 mg/s, which is as close as possible to space conditions. During the tests, the cyclogram of starting and stopping the engine was worked out, and the thrust dependences on the flow rate of the working fluid, the power of the high-frequency generator and the voltage at the emission electrode were obtained. According to the test results, stable engine operation was achieved and the following values were obtained: the thrust of 9.1mN at a specific impulse of 3740 s.

Pengukuran level pembentukan es (ICING) pada pemodelan menggunakan rancang bangun sensor berbasis perubahan frekuensi dengan induktor datar

Icing is one of the main dangers for the flight and are cumulative. The icing is a process of accumulation of ice on parts of the aircraft, which will lead to changes in geometry and resulted in a variety of other disorders. For example, there was a buildup of ice on the propellor (propeller) and the engine carburetor so it can reduce the thrust plane even caused the plane to fall freely (stall). For it needs to be designed and built the Icing Detector as well as the actuator in providing early warning of the existence of the calculation and the icing on the pilot. This instrument is designed with electronic units that use the oscillator as frequency generator and frequency meter based mikrokontroller ATmega8 as the measuring frequency. The surface of the sensor is made up of printed inductor with a broad surface for detection area. Sensors and electronic units connected by cable. In addition, modeling for the pilot indicators have been designed using the LCD. Research results suggest that testing on "Ice Accretion-Level Measurement On Modelling using printed Inductor Sensor Prototype Based On Frequency Shifting" has been a successful made in accordance with the expected functions. These instruments can detect the occurrence of icing and give an indication of the thickness of the ice. It is possible to form a flat sensor installation on the aircraft to be more unobtrusive air flow, as well as a spacious surface produces more accurate results.

Effect of low-frequency electromagnetic field on laboratory seed germination and seedling yield of Scots pine (Pinus sylvestris L.)

The results of research that was conducted in 2017 in the laboratory of the Department of Forest crops, breeding and dendrology of the BMSTU (Mytishchi branch) and in the Pravdinsky nursery of the Pushkin forest technical College of the Moscow region. The purpose of the study was to determine the effectiveness of the influence of low-frequency electromagnetic field (EMF) on laboratory and ground germination of common pine (Pinus sylvestris L.) seeds with low seeding characteristics. Samples of common pine seeds of the 3rd quality class were selected for the study (collection 2014). The seeds selected for the study were treated with low-frequency EMF using POSEP technology (pre-sowing seed treatment with an electromagnetic field) with a low-frequency generator Rost-Active. One part of the seeds was laid for germination in the laboratory in 4-fold repetition, the other was sown in the sowing Department of the Pravdinsky nursery in 3-fold repetition, control was served by unprocessed seeds. As a result of pre-sowing treatment of pine seeds, laboratory germination exceeded the control by 25 %, and approached the indicators for class I seeds. In the Pravdinsky nursery, the yield of 1-year-old seedlings increased by 16 %, and their height was 47 % higher than the control. The results of laboratory and field studies have demonstrated the high efficiency of pre-sowing treatment of common pine seeds using POSEP technology and its ability to restore the seed quality after long-term storage, increase the yield of seedlings and improve their biometric indicators.

A Coagulation Mode on Bipolar Electrosurgery Unit Using 350 KHz Frequency and Power Selection

Losing a lot of blood during surgery using a conventional scalpel is something that is highly avoided. The purpose of this study is to replace the conventional scalpel with a tool that utilizes a high frequency whose duty cycle is regulated and then centered at one point. Researchers take advantage of the effect of heat generated by high frequencies which are centered at one point so that it can be used for the process of surgery and coagulation in body tissues so as to minimize the occurrence of a lot of blood loss. Researchers use a high frequency of 350 KHz which is set with a duty cycle of 6% on 94% off and is equipped with 3 levels of power selection and uses forceps as a medium to concentrate high frequencies at one point. The module design consists of a 350 KHz frequency generator, a pulse control circuit to adjust the duty cycle, a power control circuit as a power setting, a driver circuit to combine the frequency with the set power so that different outputs are obtained according to the settings, and an inverter circuit to increase the voltage. In this study, after measuring using an oscilloscope in the driver circuit, the average output amplitude at each low, medium, and high setting was 27.25 Vpp, 28 Vpp, and 28.625 Vpp. The results showed that the bipolar electrosurgery unit (coagulation) module as a whole can replace conventional scalpels so that it can minimize the occurrence of a lot of blood loss during surgery. However, the frequency generator and power selection need to be improved.