scholarly journals Digital rotation meter

2021 ◽  
Vol 1 (2) ◽  
pp. 21-26
Author(s):  
V.V. Gerashchenko ◽  
◽  
V.P. Lobakh ◽  
N.A. Kovalenko ◽  
O.V. Bilyk ◽  
...  
Keyword(s):  
Low Cost ◽  
Gear Wheel ◽  
Rotation Frequency ◽  
Magnetic Core ◽  
The Self ◽  
Measuring Device ◽  
Light Emitting ◽  
Sensor Signals ◽  
To Receive ◽  
Splined Shaft

There was developed a digital universal measuring device for the rotation frequency of various parts: a gear wheel, a splined shaft, a special disc with slots, etc. The use of a 16-digit summing electronic counter makes it possible to form a digital code up to 65536 pulses per second, which makes it possible to install it on almost any vehicle. At the same time, it has simplicity, low cost, reliability and accuracy. The design of the meter includes a signal transducer, a self-oscillating multivibrator, logic ele-ments, and an electronic summing pulse counter. The sensor of the meter is made in the form of an inductance coil with a magnetic core. The first differentiating circuit with a diode is used as a con-verter of the sensor signals, connected to a logic AND gate, which is connected by its output through a resistor to the counting input of the counter. The input of the second differentiating circuit and the second input of the logical element AND are connected in parallel with the output of the self-oscillating multivibrator, and the input for setting the zero of the counter is connected in parallel with the output of the second differentiating circuit. The self-oscillating multivibrator is symmetrical, and the resistance of its resistors and capacitors are selected in such a way that the formation of rectangular voltage pulses and pauses duration of 1 second at its output is ensured. The presence of a sixteen-bit summing electronic counter, consisting of 16 triggers and having 16 outputs and 16 light-emitting diodes, each of which is connected to one of the outputs of the counter, allows, when the meter is turned on, to receive digital codes at their output in one second, showing the speed. An example of calculating the elements of the differentiating circuit of a multivibrator is given. The experiments have confirmed the efficiency of the developed rotational speed meter.

scholarly journals Digital on-board clutch tester

2021 ◽  
Vol 1 (1) ◽  
pp. 23-28
Author(s):  
V.V. Gerashchenko ◽  
◽  
V.P. Lobakh ◽  
N.A. Kovalenko ◽  
V.D. Rogozhin ◽  
...  
Keyword(s):  
Digital Technology ◽  
Rotational Speed ◽  
Technical Condition ◽  
Magnetic Core ◽  
The Self ◽  
Light Emitting ◽  
Gear Teeth ◽  
Input Shaft ◽  
Decimal Number ◽  
The Difference

The work is devoted to the creation of a digital type on-board device for diagnosing the clutch of traction vehicles (TV) and allows to accurately determine the slipping of the clutch when failures appear in it. The principle of operation of the device is based on the use of digital technology for measuring the rotational speed (number of pulses) in the digital code of the flywheel and the input shaft of the gearbox (GB). The received digital codes are displayed with the help of light-emitting diodes, showing the number of voltage pulses per second from the flywheel speed sensors and the gearbox primary shaft gear. The received digital codes are converted by the driver (operator) into the decimal number sys-tem. Given that the number of flywheel teeth is greater than the number of gear teeth, the number of pulses from the sensors is adjusted by dividing the number of pulses from the flywheel per revolu-tion by the ratio of the number of flywheel teeth to the number of gear teeth. Next, the difference between the corrected number of pulses from the gear and the flywheel is determined. Further it is compared with the permissible number of pulses and a conclusion about the technical condition of the clutch based on this comparison is made. If the difference is equal to zero or less, the clutch will be considered efficient. The device for diagnosing the clutch includes two digital speed sensors, each of which contains an inductance coil with a magnetic core, rigidly fixed near the flywheel teeth and gears of the input shaft of the gearbox. The first differentiating circuit, with a cut-off diode at the output, by the input is connected to the inductor and is made on the first and second resistors and capacitor. The second differentiating circuit with a cut-off diode at the output is made on a resistor and a capacitor, and the input is connected to the output of the self-oscillating multivibrator. The self-oscillating multivibrator is made on two NAND logical elements, two capacitors, two diodes and two resistors. The output of the second differentiating circuit is connected to the zero-setting inputs of sixteen-bit summing electronic counters. The outputs of the AND logical elements are connected by means of resistors with the counting inputs of two electronic counters, at the out-put of which the digital codes are formed. The codes reflect the rotational speed of the flywheel and gears of the input shaft of the gearbox. An example of calculating the parameters of the elements of the differentiating circuit of an auto-oscillating multivibrator is given.

A simple method to construct a low-cost immunosensor based on a dithiol-functionalized polydopamine platform

2021 ◽  
Author(s):  
Bo Liu ◽  
Luanying Yang ◽  
Gang Wang ◽  
Sha He ◽  
Xiaobo Wang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Linear Response ◽  
Low Cost ◽  
Covalent Immobilization ◽  
The Self ◽  
Simple Method ◽  
Low Detection Limit

A simple and low-cost electrochemical CEA immunosensor was investigated via the self-polymerization of dopamine and a dithiol compound spacer for the covalent immobilization of antibodies. The designed CEA immunosensor exhibited a linear response and a low detection limit.

The Costs and Benefits of Shareholder Democracy: Gadflies and Low-Cost Activism

2020 ◽  
Author(s):  
Nickolay Gantchev ◽  
Mariassunta Giannetti
Keyword(s):  
Low Cost ◽  
Shareholder Value ◽  
Career Concerns ◽  
Costs And Benefits ◽  
Cross Sectional ◽  
Shareholder Proposals ◽  
Active Individual ◽  
Shareholder Democracy ◽  
To Receive

Abstract We show that there is cross-sectional variation in the quality of shareholder proposals. On average, proposals submitted by the most active individual sponsors are less likely to receive majority support, but they occasionally pass if shareholders mistakenly support them and may even be implemented due to directors’ career concerns. While gadfly proposals destroy shareholder value if they pass, shareholder proposals on average are value enhancing in firms with more informed shareholders. We conclude that more informed voting could increase the benefits associated with shareholder proposals.

Patterning Organic Fluorescent Molecules with SAM Patterns

2011 ◽  
Vol 1335 ◽  
Author(s):  
Qiong Wu ◽  
Juanyuan Hao ◽  
Shoulei Shi ◽  
Weifeng Wang ◽  
Nan Lu
Keyword(s):  
Organic Molecules ◽  
Low Cost ◽  
Substrate Surface ◽  
Large Area ◽  
Self Assembled Monolayer ◽  
Storage Duration ◽  
Light Emitting ◽  
High Throughput Method ◽  
Self Assembled ◽  
Fluorescent Molecules

ABSTRACTWe report a low-cost and high-throughput method to fabricate large-area light emitting pattern via thermal evaporation of organic molecules on the patterned self-assembled monolayer of homogenous 3-aminopropyltrimethoxysilane. This method is based on the selective deposition of the organic light emitting molecules on the template of self-assembled monolayer (SAM), which is patterned with nanoimprinting lithography. The selectivity can be controlled by adjusting the design of the pattern, the storage duration and the substrate temperature. The deposition selectivity of the molecules may be caused by the different binding energy of the molecules with the SAM and the substrate surface.

Porphyrin doping of dichloride-bis(5,7-dichloroquinolin-8-olato)tin(IV) complex for electroluminescence

2013 ◽  
Vol 17 (05) ◽  
pp. 351-358 ◽  
Author(s):  
Mohammad Janghouri ◽  
Ezeddin Mohajerani ◽  
Mostafa M. Amini ◽  
Naser Safari
Keyword(s):  
Molecular Orbital ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Energy Levels ◽  
Orbital Energy ◽  
Homogeneous Layer ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Fundamental Structure ◽  
Organic Light

A method for obtaining red emission from an organic-light emitting diode has been developed by dissolving red and yellow dyes in a common solvent and thermally evaporating the mixture in a single furnace. Dichlorido-bis(5,7-dichloroquinolin-8-olato)tin(IV) complex ( Q2SnCl2 , Q = 5,7-dichloro-8-hydroxyquinoline) has been synthesized for using as a fluorescent material in organic light-emitting diodes (OLEDs). The electronic states HOMO (Highest Occupied Molecular Orbital)/LUMO (Lowest Occupied Molecular Orbital) energy levels explored by means of cyclic voltammetry measurements. A device with fundamental structure of ITO/PEDOT:PSS (55nm)/PVK (90nm)/ Q2SnCl2/Al (180nm) was fabricated and its electroluminescence performance at various thicknesses of light emitting layer (LEL) of Q2SnCl2 is reported. By following this step, an optimal thickness for the doping effect was also identified and explained. Finally a device with fundamental structure of ITO/PEDOT:PSS (55nm)/PVK (90nm)/meso-tetraphenylporphyrin (TPP): Q2SnCl2 (75nm)/ Al (180nm) was fabricated and its electroluminescence performance at various concentrations of dye has been investigated. It is shown that this new method is promising candidate for fabrication of low cost OLEDs at more homogeneous layer.

Halide Perovskite Based Light-emitting Diodes: A Scaling Up Perspective

2021 ◽  
Author(s):  
Ting Zhang ◽  
Lin Wang ◽  
Lingmei Kong ◽  
Chengxi Zhang ◽  
Haiyong He ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Scaling Up ◽  
Color Gamut ◽  
High Definition ◽  
Light Emitting ◽  
Metal Halide Perovskite ◽  
Wide Color Gamut ◽  
Halide Perovskite ◽  
High Color Purity

Metal halide perovskite light-emitting diodes (PeLEDs) have aroused extensive attention due to their high color purity, wide color gamut, low-cost solution processability, showing great potential for application in next-generation high-definition...

Developing low-cost methane gas concentration measuring device

2021 ◽  
pp. 54-59
Author(s):  
Md. Mahidy Hossain ◽  
Nadim Khandaker
Keyword(s):  
Promising Result ◽  
Low Cost ◽  
Measurement Techniques ◽  
Health And Safety ◽  
Modern Science ◽  
Methane Content ◽  
Measuring Device ◽  
Methane Generation ◽  
Methane Gas ◽  
Wide Range

In every aspect of Engineering more advanced, efficient and progressive solutions are required. The modern age of science requires innovative minds. The field of environmental engineering is also advancing with modern science and technology innovations. Measuring of methane concentration and flow rate is nothing new, yet a complicated process. The need for more accurate measurement is a necessity in proper operation of bio digesters for methane generation. The traditional process of the measuring methane content in biogas is time consuming yet complicated. The need for development and application of methane measurement techniques is not only limited to biogas but has other monitoring value as well in other health and safety applications in built environments. Winsen Electronics and Hanwei Electronics are two of the leading sensor-manufactures of China who are providing a wide range of gas detecting sensors that are locally available in Bangladesh and yet has not been applied to methane content measurement in biogas operations. In This paper we are reporting on the application of a purpose-built propane, butane detector for methane gas detection within the range of accuracy for it to be applied in methane detection in a biogas stream. This paper, reports on application and calibration of the methane detecting sensor MQ-4 with promising result. Based on the study we postulate that the sensor can be used to detect methane for an on-line monitoring of many environmental, industrial purposes such as bio digesters, integrated waste management facility. The cost of fabrication of the sensor system is only $18 making it a viable sensor with respect to cost for application in Bangladesh.

Solution Processed Fabrication of Perovskite Light-Emitting Diodes: Towards Low Cost and Commercial Applications

2021 ◽  
Author(s):  
Jianfeng Zhang ◽  
Bin Wei ◽  
Lin Wang ◽  
Xuyong Yang
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Color Purity ◽  
Color Gamut ◽  
Light Emitting ◽  
Metal Halide Perovskite ◽  
Wide Color Gamut ◽  
Halide Perovskite ◽  
Commercial Applications ◽  
High Color Purity

Metal halide perovskite light-emitting diodes (PeLEDs) have emerged as one of the most promising candidates for next-generation high-resolution displays, due to their wide color gamut, high color purity and low-cost...

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