:This paper investigates the breakdown voltage of Carbon ionised affected by butane and air gas impurities at slightly atmospheric pressure. The ionization process is conducted by electrical discharge using graphite electrode with the gap in millimeter scale to generate plasma by the direct current voltage less than 3.5kV. The experimental results show the breakdown voltage and current of plasma. Carbon plasma density and temperature are calculated from the current and voltage. These results show the ionization of air at slightly low pressure having a maximum voltage of 570V. The breakdown voltage and current are respectively 530-570V and 0.27 to 0.45mA. At high pressure it has a maximum voltage of 1160 V, the voltage and the current breakdown are respectively 900-1100V and 0.46 to 0.6 mA. When gas impurities are injected at slightly low pressure, it has maximum voltage of 772V, the breakdown voltage is 536-775V and the current is 0.03 to 0.45mA, whereas at high pressure it has a maximum voltage of 1044V, the breakdown voltage is 675-105 V and the current is 0.03 to 0.69mA. The results are interesting phenomena and can also be applied to develop a level of purity of Carbon Nano Tube formation at the cathode end of the effects of the density and temperature of the plasma generated.
Renovation work is being carried out at Bangkinang City Park, to beautify the city park which is one of the places currently visited in Kota Bangkinang. On the 13th week of work, the project achievement reached 19,689% while the plan achievement was 33,673%, there was a deviation of -13.984%. The purpose of this study is to determine the performance index and completion of construction projects against costs and times. The research method used Earned Value method which integrates aspects of cost, time, and job performance. The results of performance control are reviewed for 6 weeks, starting from week 13 to week 19 by collecting data in the form of ACWP, BCWP, and BCWS values. At week 19 the schedule performance index was 0.3302 (SP1 <1). The cost performance index is valued at 0.915 (CPI <1). Analysis of the estimated completion time produces a calculation that is around ± 34 weeks, which means that the work is delayed for ± 15 weeks. The estimated cost for completion of the Bangkinang City
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