Industrial environmental control and technical regulations for cancer-causing emissions from thermal power plants

Current environmental safety rules and regulations require power companies to apply for comprehensive environmental permits calculating permissible emissions of cancer-causing and mutagenic substances for each source of pollution. Difficulties of instrument testing and monitoring of cancer-causing emissions prevent industrial companies from adequate regulatory limit applications. The author of this paper proposes research results on gas duct sizing for boiler plants in order to allow engineers performing correct instrument testing for compliance with the requirements of comprehensive environmental permits.

Passive Balancing of the Rotor with an Auto-Balancing Device with a Viscous Incompressible Liquid

The use of liquid auto-balancers to compensate the operational changes in the imbalance of rotary systems without stopping them is of interest because of the relative structural simplicity of these devices, which are passive direct-acting regulators that do not require power supply and control systems to move correction masses. The experience of the study of passive auto-balancing devices (SBD) indicates that the existing theory (statements) of passive automatic balancing of the fluid is idealized and inaccurately describes the processes that occur with the working bodies during their operation. In particular, the lack of studies on the effect of liquid viscosity on the efficiency of self-balancing and the reasonableness of the selection of liquid during the development of fluid SBD demanded to analyse the operation of liquid SBD in the real system, taking into account the influence of liquid properties on the efficiency of the vertical rotor balancing process. It is shown that the efficiency of balancing increases with the approach of the angular velocity to the critical one and with the increase of the external resistance. The massive forces of the working fluid have less effect on the balancing efficiency than the viscosity for liquid SBDs.

Noise in Telecommunication: Different Types and Methods of dealing with Noise

This article discusses noise in telecommunications: different types and methods of dealing with noise. Noise is arguably a very hated problem because it can interfere with the quality of signal reception and also the reproduction of the signal that will be transmitted. Not only that, but noise can also limit the range of the system to a certain emission power and can affect the sensitivity and sensitivity of the reception signal. Even in some cases, noise can also result in a reduction in the bandwidth of a system. Of course, we've all felt how annoying the noise effect is. For example, when listening to the radio, a hissing sound appears on the loudspeaker due to noise. To overcome noise, it is divided into passive noise control and active noise control. Passive noise control is an effort to overcome noise using components that do not require power. Generally passive noise control uses soundproof materials that act as insulation against noise. The method most commonly used to overcome noise is through increasing the gain. The noise is generally in a specific sound area. Hiss is on high frequencies, while noise and hum are on low frequencies. This is the principle underlying the noise reduction method.

DESAIN SARANA PENGISI DAYA PONSEL DI DIREKTORAT POLITEKNIK NEGERI SAMARINDA

ABSTRACTEveryday human life is inseparable from the need to communicate. One of the tools commonly used to communicate remotely is mobile. Mobile technology that adopts cutting edge technology is called smartphone. Smartphones are the needs of people who have many benefits, facilitate work, and improve lifestyle. Smartphones can not be used continuously.Smartphones require power to be able to power up and use. A battery charger or battery charger is a device used to recharge energy into the battery by entering an electric current through it. But there are many obstacles that are often experienced when we have to spend the day outside the house, providing limited electricity in public places makes it difficult for us to recharge smartphone bat teries. The need for battery charging continues to increase along with its power consumption. The new innovation of concern is like the means of charging batteries in public places such as the Institute of Education. One of them is the Samarinda State Poly technic. While in public and smartphone batteries are weak, based on convenience aspect, smartphone type and place to charge smartphone battery. Therefore,to design a product that is a convenient means of charging station design and there are various types of chargers that can facilitate visitors to charge the smartphone battery, then made a means Charging Station Directorate of State Polytechnic Samarinda.Keywords: Smartphone, Charger, Institute of Education.

Optical sensor of components concentration in solution

Purpose This paper aims to focus on the development of an optical concentration sensor designed for measuring the concentration of components in solutions. Design/methodology/approach The operating principle of the developed sensor is based on the Bouguer–Lambert–Beer law. An optical measuring system using fiber optical cables was used for the practical implementation of the concentration sensor. Findings As a result of fiber optical cable use in the concentration sensor, the remote measurement principle was implemented, ensuring the instrument’s reliability and the reduction of operating costs. Originality/value The advantage of the proposed measuring system is that the sensitive element is maintenance-free, does not require power supply and can operate under severe industrial conditions. Using a fiber optic cable to transmit a light signal allows placing the sensitive element at a distance of several tens of meters from the electronics unit (the smart part).

TransPrint: A Method for Fabricating Flexible Transparent Free-Form Displays

TransPrint is a method for fabricating flexible, transparent free-form displays based on electrochromism. Using screen-printing or inkjet printing of electrochromic ink, plus a straightforward assembly process, TransPrint enables rapid prototyping of displays by nonexperts. The displays are nonlight-emissive and only require power to switch state and support the integration of capacitive touch sensing for interactivity. We present instructions and best practices on how to design and assemble the displays and discuss the benefits and shortcomings of the TransPrint approach. To demonstrate the broad applicability of the approach, we present six application prototypes.

TEACHER AUTHORITY IN SCHOOL

The purpose of education is to initiate the young into the different ways in which, over the centuries, men have organized their experience and understanding of the world. This initiation depends upon the ability of teacher to explain and inspire, and on the willingness of the young to engage in this enterprise with a proper humility. The discussion on the role of authority in knowledge development and the subject of lack of teacher's authority is in great tension. The role of the teacher has changed, authority, a fundamental part of the teaching–learning process, is a problematic and questioned by society, the media, parents and students. Due to the fact that the teacher is in the role of the manager of the class, they require power in another form, the authority to influence student behavior. This could be termed teacher authority. Power and authority are central features of teachers' work. Many studies of teachers emphasize the impact that teachers have on students. Legitimate teacher authority is fundamental to effective teaching, but is often a thorny issue that teachers need to grapple with when teaching in modern teaching contexts.The main goal of the article is to analyze the teacher's authority and the pedagogical act in the situation of social change.

Modification of an Uninterruptible Power Supply (UPS) for an Extended Running Time

Uninterruptible Power Supply (UPS) is increasingly becoming popular as a means of providing conditioned and uninterrupted power supply to sensitive and non-sensitive loads at critical and non-critical times.Sensitive modern equipment with very low tolerance for power fluctuation and failures are on the increase due to advancement in science and technology, theseequipment however require power backed up if they are to perform optimally. This study focuses on modification of the UPS in order to extend its running time.A used and dumped UPS working at a back-up time of between 0 to 10mins was modified to accommodate two, 75AH Lead acid batteries, using 1400VA Zinox UPS. An extended backup time of between 2hrs to 8hrs on the same UPS using Lead Acid/Deep Cycle batteries was achieved which at the same time operating within a very low budget.

PULSE EVALUATION AND RELIABILITY ANALYSIS OF 4H-SiC SGTO MODULES

Army applications require power components that are utilized in pulsed power systems to be reliable and durable, compact, have high power and energy density, and lastly, to be easily integrated into combat vehicles. The U.S. Army Research Laboratory (ARL) is currently investigating silicon carbide Super-gate turn-off thyristors ( SiC SGTOs) to meet the future pulsed power system requirements for the Army. ARL's methodology is to evaluate the device performance in pulsed power circuits that emulate the electrical stresses that the power devices would encounter in a pulsed power system. Each module being evaluated utilized four 0.6 cm2 SiC SGTOs. The packaging design for the module utilizes ThinPak technology. The module has reliably been pulsed over 2000 times at peak currents greater than 8 kA with a pulse width of 170 μs. The module has also been pulsed greater than 3.6 kA at a pulse width of 1 ms, corresponding to an action rate of 7000 A2s and a current density of 2.5 kA/cm2 over the cathode mesa area. This work evaluates SiC SGTO modules under various pulsed conditions. This paper includes details on device structure, module package design, and module pulsed switching and reliability.

Ripple Current Effects on PEMFC Ageing Test by Experimental and Modeling

PEMFCs’ systems usually require power conditioning by a DC/DC boost converter to increase the output fuel cell voltage, especially for automotive applications and stationary applications. The output fuel cell current is then submitted to the high frequency switching leading to a current ripple. The ripple current effects on fuel cell are studied by experimental ripple current ageing test on a 5 cell stack (MEA surface of 220 cm2) and compare to a reference ageing test. The stack is run in nominal conditions but an AC component is added to the DC current load. The AC component is a 5 kHz triangle which amplitude is ±20% of the DC component in order to simulate a boost waveform. Fuel cell characterizations (polarization curves, impedance spectra and voltammetry) provide information on the PEMFC ageing and the performance evolution. Local conditions are computed through a dynamic stack model. The model takes into account transport phenomena, heat transfer, and semi-empirical electrochemical reactions and includes a meshing to calculate local conditions on the MEA surface (gas reactant pressures, local temperature, gas molar fractions, water activity, and local electronic current density). The consequences about performance and ageing during high frequency ripple current are explained.