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Influence Leadership and Health and Safety (K3) on Employee Performance PT. PLN (Persero) UPJ-Central Semarang Engineering Aprilia, Riana; Prihatini, Apriatni Endang; Nugraha, Hari Susanta
Jurnal Ilmu Administrasi Bisnis Volume 5, Nomor 2, Tahun 2016
Publisher : Departemen Administrasi Bisnis, FISIP Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (259.473 KB)

Abstract

Every company needs a resource that has an important influence to achieve success. Human resource management play an active role in improving employee performance through a number of variables that influence including leadership and occupational health and safety (K3). Based on the existing problems in this study was a decrease in the performance of employees of PT. PLN (Persero) UPJ-Central Semarang technique in 2014 in repairing damaged transformers, transformer damage that should be the target of 25 units, but in reality to 39 units and the target shrinkage transformer is supposed to 8.55% but in fact 19.62%. The aim of this study was to determine the effect of leadership and occupational health and safety (K3) on the performance of employees of PT. PLN (Persero) UPJ-Central Semarang techniques. This type of research is explanatory research. The population in this study are employees of PT. PLN (Persero) UPJ Middle Semarang engineering section with a sample size of 50 respondents. Census sampling techniques. The technique of collecting data using questionnaires and interviews. The analytical method used is validity, reliability, cross tabulation, correlation, determination, regression analysis, the significance test with SPSS. Research, leadership is in excellent health and safety (K3) is quite good, and the performance as very good. It shows when the leadership is getting better and with the implementation of occupational health and safety (K3) is good, then the performance will increase. Researchers suggest that high employee performance it should be more assertive leadership, solid, and clear in giving instructions, so that each employee can capture well the instructions given by the leader and carry out their work according to the instructions of work that has been directed. Listening to complaints from employees, employee supervision until the work is completed on time. More attention to the work tools and equipment that are not proper to use immediately replaced a new one, so that employees feel comfortable in their work.
Utilization Waste Materials to Synthesize Nano Al2O3-CaO Photocatalyst using Infused Red Guava Leaves (Psidium Guajava L.) Rodiah, Siti; Aprilia, Riana; Ariesta, Nina
Al-Kimia Vol 10 No 2 (2022): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v10i2.33481

Abstract

Diazinon is a very toxic pesticide for animals and humans that is widely used in the agricultural sector, so this pollutant needs to be reduced or eliminated in the environment through photodegradation using photocatalysts derived from metal oxides. The catalytic activity of metal oxides is enhanced by adding a support material and increasing the surface area by reducing the particle size to nano size. In this study, kaolin as a source of Al2O3 and golden snail shells as a source of CaO which used to synthesize Al2O3-CaO nanoparticles (NPs) with a simple and environmentally friendly method using plant infusions. Synthesis of Al2O3-CaO NPs using infused red guava leaves (Psidium guajava L.) had been done by utilized the secondary metabolites as reducing agents and stabilizers in the nanoparticle synthesis. FTIR analysis confirmed the presence of alumina (Al-O) groups at wave numbers 850 – 650 cm-1 and CaO at 3642 cm-1. XRD analysis showed NPs Al2O3-CaO had cubic with the crystal size of 14.59 nm. The morphology of Al2O3-CaO NPs showed in the SEM pictures were agglomerated. Al2O3-CaO NPs degraded diazinon by 75% within 180 minutes under UV radiation. Thus, this research not only reduce waste material, but also reduces water pollutant.
The Examination of the Wien’s Displacement Constant with Simulation and Simple Numerical Approaches Aprilia, Riana; Alifaturrohmah, Marisa; Purnama, Gilang; Wahyuni, Siti
Physics Communication Vol 6, No 2 (2022): August 2022
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v6i2.39821

Abstract

The purpose of this research  was to examine the value of the Wien’s constant using PhET Simulation virtual laboratory and simple numerical approach. The independent and dependent variable is blackbody temperature (T) and maximum wavelength (λ_max). In the use of a virtual laboratory, research is carried out by shifting the black body temperature feature so  the graph will display a spectral power density that varies to the wavelenght. Numerical approach was used in this research is Newton Raphson methods by Python program. Both of simulation and numerical approach yield the value of the maximum wavelength (λ_max) for a black body temperature variation. The black body temperatures and their appropriate maximum wavelength data then analyzed using linear regression. Final result show that value Wien’s constant using PhET is 2,93 × 10-3 mK with relative error obtained is 1,07 % while using Newton Raphson the Wien’s constant value obtained is 3,07 × 10-3 mK with relative error is 5,90 %. The two approachs carried out produce data that slightly different, but still in a very good accucracy range when compared with theory. So, PhET Simulation and Newton Raphson methods effective to examine the value of the Wien’s constant.
Co-Authors Alifaturrohmah, Marisa Apriatni Endang Prihatini Gilang Purnama, Gilang Hari Susanta Nugraha Nina Ariesta siti rodiah Siti Wahyuni