2022 · Article · Open Access
<p>Porous coordination polymers (PCPs) were synthesized with used TCNQ anion that acts as cross linker connecting and bipyridine to form a 3D framework. In these study, we use zinc and manganese metal ion as centre of complex coordination. Green crystal of Zn(TCNQ-TCNQ)bpy.1.5 benzene and Mn(TCNQ-TCNQ)bpy.1.5 benzene was successfully synthesized in no under magnetic field (0T) and under magnetic field 6T. XRD patterns of Zn(TCNQ-TCNQ)bpy.1.5 benzene 0T and 6T shown not significant different pattern that indicate no different crytal formed. XRD patterns of Mn(TCNQ-TCNQ)bpy.1.5 benzene also shown not significant different but we found five different intensity ratio peaks that possibility it was a little bit changing of crystal structure. To investigate the pores properties, adsorption isotherm was performe for oxygen gas in 77 K and the guest of benzene were removed at 413 K for 3 hours under low pressure. Zn(TCNQ-TCNQ)bpy}1.5benzene 0T and 6T oxygen adsorption isotherms shows the unique sorption isotherms by gate pressure profile. On other hand, Mn(TCNQ-TCNQ)bpy}1.5 benzene 0T and 6T shows type 1 adsorption isotherms for micropores materials. Adsorption isotherm was also determined in magnetic field 6T for all crystal, and shows shift of gate pressure for Zn compounds and enhance the amount of oxygen adsorbed for all kind of compounds.</p><em>Key words: </em><em>porous coordination polymers, polymers synthesis, magnetic field</em>
2022 · Article · Open Access
<p><em>The objective of this research is to determine both performance and design spesification of Salinitymeter and Turbiditymeter. This system combine</em><em>d</em><em> from several sub system</em><em>s</em><em> such as electrode and Light Dependent Resistor (LDR) sensor, microcontroller Arduino, Liquid Crystal Display (LCD) and Light Emiting Diode (LED) indicators. The variable of this research are salinity and turbidity. The result of this research divided in two parts. The first is performance spesification, this system using copper electrode as salinity sensor and LDR as turbidity sensor. This consist of two plastic box which are circuit box and sample box. The second is design spesification that consist of some data such as accuration and precision. Salinity measurement has accuration 95.71% with precision 97.22%, Turbidity measurement has 96.25 % of accuration and 97.69% of precision.</em><strong></strong></p><p><em>Key words: salinity, turbidity, electrode sensor</em></p>
2022 · Article · Open Access
<p>Along with growth of computer technology, at the moment computer not only exploited for the application of having the character of public like reporting processes, data, but also exploited for the operation of equipment and system controller. In this research, writer try the application of personal computer as system of door control at a halte of bus way by using one tide sensor the LED infrared placed in way in at special band of bus way and one tide sensor the LED infrared again placed in constrictor wall. By exploiting electronics component as controller of door of halte of bus way supported with the language programming Borland Delphi 7.0, writer have earned to design a prototype which can give the amenity of management a halte of bus way.</p><em>Key words: sensor LED infra red, interface port parallel</em>
2022 · Article · Open Access
<p>The wind is one of the important parameters in meteorology to determine weather and climate. It can be determined by using two quantity measured, such us speed and direction of wind. Based on the result of measuring will obtain important information that can be used for disaster prevention. For measuring of wind speed, this reserch design a measurement using optocoupler sensor to determine wind speed with change of sensor resistance. The sensor is conected to an electronic circuit and a microcontroller Arduino Uno Rev3 and it is programmed to get the desired results. Based on data analysis, there are two result of research namely performance and design specifications. The instrument consists of two parts; the electronic circuits and mechanical parts making up the system of measuring instruments of wind speed. Based on the results conducted, the accuracy of this measuring instrument is 91.39% with 3.22% error percentage and the accuracy of the instrument was 98.9% with 1:11% relative error percentage.<em></em></p><em>Key words: sensor optocoupler, microcontroler arduino</em>
