PRODUKTIVITAS KERJA KARYAWAN DIPENGARUHI OLEH PENILAIAN PRESTASI KERJA, KEPEMIMPINAN, PENDIDIKAN, MASA DINAS DAN JENJANG PEKERJAAN PADA PT. CENTRALPERTIWI BAHARI FEED MILL OPERATION DI LAMPUNG

ABSTRACT This research aimed at finding out whether the performance appraisal, education, length of service and work rank simultaneously or partially influenced employee’s productivity at PT. CPB. Performance appraisal, leadership, education, length of service and work rank simultaneously gave positive and significant influence towards employee’s productivity at PT. CPB. Employee’s productivity at PT. CPB was determined by performance appraisal, leadership, education, length of service and work rank. Employee’s productivity at PT. CPB was significantly influenced by performance appraisal. Employee’s productivity at PT. CPB was significantly influenced by leadership. Employee’s productivity at PT. CPB was significantly influenced by education. Employee’s productivity at PT. CPB was significantly influenced by length of service. Employee’s productivity at PT. CPB not influenced by work rank. The performance appraisal had a major influence on employee’s productivity at PT. CPB which was proved by the high score of regression coefficient of performance appraisal variable (0.963), higher than the regression coefficient of leadership variable (0.538), higher than regression coefficient of education variable (0.009), higher than regression coefficient of length of service variable (0.011), and higher than regression coefficient of work rank variable at (0.010).

Disposal of waste products from fibrous composite material

The article proposes a method of processing fiberglass to obtain a fibrous component used as reinforcing filler for the manufacture of secondary composite materials. The obtained analytical dependencies can be used to develop the design of the mill elements, as well as to optimize the grinding process When disposing of products made of fibrous composite material, the following scheme is proposed. The proposed analytical method for determining the modes of the grinding process solves the problem of choosing the preferred parameters of the mill operation depending on its functional dimensions and properties of components in a fibrous secondary composite material.

Cutting effectiveness increase at expense of adaptive control in digital production systems

The paper is dedicated to the development of solutions for cutting effectiveness increase at the expense of the potentialities use of modern NC automated equipment and these solutions application for the formation of digital production systems (DPS) for machining. There are developed computation formulae allowing the definition of cutting force values during turning and mill operation aimed for technological pre-production (TP) and for the adaptive control of NC equipment in DPSs.

Theoretical aspects of energy consumption acoustic evaluation at the jet grinding

The objective of this work was to develop an acoustic method for evaluating energy consumption during the jet mill operation on the basis of the new generalized physical laws of material dispersion at it destruction. Theoretical explanation is given to the problem of energy consumption diminish in the mode of fine grinding. Dependences between the product dispersion and critical energy density in the course of destruction are described. The acoustic-emissive parameters of dispersion of the samples loaded by compression and results of acoustic estimation of the jet grinding are considered. Interrelation between the gas-jet mill performance and parameters impacting on the energy consumption are analyzed. Grounds are given for using a criterion of extremal control of the working process for maintaining maximal performance. An acoustic size effect of dispersion is formulated by the analogy with dynamic size effect of destruction (DSE). A new approach to evaluation of energy consumed by the jet mill is developed from positions of unity of nature and mechanism of the loaded body destruction with community of manifestation of physical laws of acoustic emission and effects of new surface formation on the destroyed particles. Leading role in the methodology of energy consumption evaluation is given to the coefficient gN (J/imp) of transformation of the consumed energy into acoustic radiation at optimal mode of the mill operations (at maximum performance), which is calculated as a ratio of the reduced work (energy) to the acoustic signal counts in the grinding zone. Current energy consumption ЕDt (J) for period Dt (s) of work is calculated with taking into account coefficient gN (J/imp) and average (for the interval Dt) acoustic activity (imp/s). It is possible to maintain minimum energy consumption at the jet grinding by the snap-acting control of jets loading up to the level of the measured acoustic activity in the grinding zone, at which a “conditionally permanent” value of coefficient gN can be achieved. The results of acoustic evaluation of effective surface energy at optimal grinding mode correspond to the range of estimation gs in the regularity of the DSE destruction. This fact confirms validity of the dispersion theory (including the acoustic size effect) use for evaluating current energy consumption in the course of the jet mill operation.

Oil Palm Fibre Waste to Biogas Electricity Production Framework for Mill Operation

One of issue regarding of renewable energy supply chain is source sustainability and reliability to ensure continuous production. The aim of this paper is to suggest the oil palm fibre waste to biogas electricity production framework: mill operation perspective that suit to be practices based on evaluation of current practise of oil palm solid waste and Malaysia’s palm oil industry. The framework is based on palm oil mill operation to utilise annually solid waste generate as biomass source for stable biogas electricity production. This conceptual paper is the principal efforts that introduce the usage of storage system for biomass feed input to ensure sustainable stable electricity production from palm oil mill by manipulate their solid waste production. Prospective researchers are put forward to conduct further research to enhance biogas production as alternative for waste treatment strategy.