Milling process is one of many machining processes for manufacturing component. The length of time in the process of milling machining is influenced by selection and design of machining parameters including cutting speed, feedrate and depth of cut. The purpose of this study to know the influence of cutting speed, feedrate and depth of cut as independent variables versus operation time at CNC milling process as dependent variables. Each independent variable consists of three level of factors; low, medium and high.Time machining process is measured from operation time simulation program, feed cut length and rapid traverse length. The results of statistically from software simulation MasterCam X Milling, then do comparison to CNC Milling machine.  The data from experiments was statistical analyzed by Anova and Regression methods by software minitab 16.Results show that the greater feedrate and depth of cut shorten the operation time of machinery, whereas cutting speed is not significant influence. Depth of cut has the most highly contribution with the value of 49.56%, followed by feedrate 43% and cutting speed 0.92%. Optimal time of machining process total is 71.92 minutes, with machining parameter on the condition cutting speed is 75360 mm/minutes, feedrate is 800 mm/minutes and depth of cut = 1 mm. Results of comparison time machining process in software Mastercam X milling with CNC Milling machine indicates there is difference not significant with the value of 0,35%.

Abstract-Transesterification is commonly used to produce biodiesel from methylester. In order to control the conversion process it is often useful to employ process monitoring and in particular monitor the mass transfer processes that limit the initial reaction rates. Such monitoring of the initial phase of reaction may provide opportunity for process optimization. Previous work has identified many methods to monitor reaction progress. This paper proposes the use of a simple method which is able to provide information regarding the progress of mass transfer and chemical reaction during biodiesel production. The process uses impedance measurement. The experimentally determined impedance results clearly show the two important phases of the transesterification reaction, a mass transfer control phase followed by a kinetically controlled phase.

This paper discusses parameter estimations of step response from biodiesel transesterification process. The estimates signal generated from impedance measurement from sunflower oil transesterification process. 15 kHz AC signal has used to characterize the capacitance value during the process. The recorded signal then processed using Matlab system identification toolbox. The parametric identification method is selected to develop model structure. The model structure has modelled based on three different structures, ARMAX, BJ and ARX. The algorithm generated from identification toolbox as well as validation test. The validation test including correlation and cross correlation test. ARMAX structure appeared to be best between the others structure.

Bank sampah bumi sejahtera dibentuk berdasarkan surat keputusan Lurah Leneng Kecamatan Praya Nomor: 13.A tahun 2021 bertujuan untuk melaksanakan pengelolaan sampah berbasis masyarakat. Dalam operasionalnya bank sampah bumi sejahtera masih mengalami banyak kendala karena infrastruktur yang dimiliki masih sangat minim. Minimnya armada angkut sampah yang ada mengakibatkan belum optimalnya pengelolaan sampah di kelurahan Leneng terutama penanganan sampah organik rumah tangga. Untuk mengatasi kendala tersebut solusi yang ditawarkan dalam kegiatan PKM ini adalah pengelolaan sampah berbasis lingkungan dan penerapan komposter. Dengan solusi diharapkan sampah sudah dipilah dari sumbernya (organik dan anorganik). Dimana sampah organik ditampung dalam komposter dan anorganik diangkut ke bank sampah untuk dikelola secara ekonomis. Sehingga target luaran dari kegiatan ini adalah berkurangnya timbulan sampah dan optimasi fasilitas armada angkut sampah yang ada. Metode yang digunakan dalam pengelolaan sampah berbasis lingkungan dilaksanakan dengan mengajak mitra dan masyarakat berperan aktif dalam kegiatan mulai dari penyuluhan tentang pemilahan dan pengelolaan sampah, pelatihan pembuatan komposter. Sehingga ketika kegiatan berakhir diharapkan masyarakat dapat melakukan sendiri pembuatan komposter dan pengomposannya. Dalam kegiatan ini pengomposan sampah rumah tangga dan lingkungan dipilih satu lingkungan sebagai pilot project atau percontohan.

The addition of base NaOH and KOH solutions and the application of an air stone and a stirrer to develop turbulence in water scrubbing method were carried out to study the purification process of raw biogas. Various concentrations of the base solutions and constant stirrer speed was applied. The work results showed that the best performance in increasing CH4 content, about 70% improvement, was reached with the addition of NaOH on 2% concentration. On the other hand, about 96% and 100% improvement for CO2 and H2S respectively were obtained under 2% NaOH addition coupled with a stirrer. The addition of base solutions was very effective to increase absorbent pH level, thus maintaining absorption process in longer duration and prevented saturation of absorbent. Moreover, the application of a stirrer in packed bed column further improved the biogas quality. The improvement was resulted from the generated biogas bubble and turbulence which led to prolong contact time between absorbent and biogas.