Due to its outstanding stability, flat surface, and wide band gap, twodimensional hexagonal boron nitride (h-BN) has appeared as a vital element in a range of applications, including a perfect substrate for graphene devices, tunneling barriers, and deepultraviolet emitters. However, large-scale growth of high-grade h-BN using chemical vapor deposition (CVD) still remains challenging due to its dependence on a variety of parameters such as substrate structures, temperature, and precursor deposition rates. Here, we explore the atomic scale elementary nucleation and growth process of monolayer h-BN on normal, vacancy-disordered, and rough (terrace and step structure) Ni(111) surfaces using reactive force field molecular dynamics simulations. The impact of the precursor deposition rate and temperature on different Ni(111) substrates was also investigated. At 1500 K, a low precursor deposition rate favors large single-domain h-BN development on normal and vacancy-disordered Ni(111) substrates, whereas a higher deposition rate yields a single domain on a rough substrate. It is also explored that the initial growth rate of h-BN is higher on the rough substrate and lower on the vacancy-disordered substrate for single-domain h-BN growth. The formation of continuous h-BN islands is greater on a normal Ni substrate than the other two substrates. Although a small vacancy concentration (1.25%) in the Ni(111) substrate shows a minor effect on the growth of the h-BN layer, the rough surface shows a considerable effect on the h-BN growth. These findings pave the way for scalable high-quality CVD growth of h-BN, taking this promising material one step closer to practical applications.
Chemical vapor deposition (CVD) through sulfidation of MoO3 is one of the most important synthesis techniques to obtain large-scale and high-quality two-dimensional (2D) MoS2. Recently, H2S precursor is being used in the CVD technique to synthesize 2D MoS2. Although several studies have been carried out to examine the mechanism of MoS2 growth in the presence of sulfur and MoO3 precursors, the growth of MoS2 in the presence of H2S precursor has largely remained unknown. In this study, we present a Reactive molecular dynamics (RMD) simulation to investigate the reaction mechanism of MoS2 from MoO3 and H2S precursors. The intermediate molecules formation, the reason behind those formations, and the surface compositions of MoOxSyHz during the initial steps of CVD have all been quantified. Surprisingly, a sudden separation of sulfur atoms from the surface was observed in the H2S precursor system due to the substantial oxygen evolution after 1660 K. The sulfur detachments and oxygen evolution from the surface were found to have a linear relationship. In addition, the intermediate molecules and surface bonds of MoS2 synthesized by MoO3 and H2S precursors were compared to those of a system using S2 and MoO3 precursors. The most stable subsidiary formation from the H2S precursor was found to be H2O, whereas in case of S2 precursor it was SO. These results provide a valuable insight in the formation of large-scale and high-quality 2D MoS2 by the CVD technique.
In this paper, a door locking system with some remarkable features is proposed which makes the locking or unlocking of a door more reliable to the user than the conventional system. Robust security access with accurate detection system is provided here. It's a global ranged operation process that can be operated by simple mobile phone through short message service (SMS) transferring operation from any corner of the world where mobile network is available. A smooth and durable locking mechanism is provided and the inscrutable door moving control device is used for the efficient operation of controlling the door. This developed system provides a notification to the user if any person is intended to pass the door. The system also has the ability to provide information about the current condition of the door by sending simple text messages. Also, the user will be able to operate the system with more than one subscriber identity module (SIM) card. Most advantageously, this device is proposed with lowest cost estimation benefit. Finally, the performance of the designed system is analyzed by performing some real-time operation of it and found satisfactory performance.
Garage automation and security have been a favoured concern with technological advancement. In this paper, developed garage access security and automation system are proposed with the affiliated control of the biometric fingerprint recognition and password verification system. Here, fingerprint recognition is restricted to the registered vehicle owners of the garage, while everyone is permitted to access through a password verification system. The affiliation of the dual-sensing system is intended to maintain robust security and to retain the record of any driver's access without the vehicle owners. Moreover, the system is enriched with a subtle design of the access door and its operation mechanism. Power screw-driven door operation is utilised to convert the rotating motion of the motor to linear motion and slide the door open or close. The requisite motor torque, revolution per minute, and power requirement for door control by the screw operation are also calculated and verified.
ABSTRAK Penelitian ini bertujuan untuk menganalisis pengaruh budaya organisasi dan komitmen organisasi terhadap kinerja pegawai Universitas PGRI Palembang. Populasi dalam penelitian ini adalah seluruh pegawai administrasi yang ada di Universitas PGRI Palembang. Pengambilan sampel menggunakan teknik pengambilan sampel acak stratifikasi proporsional, dengan sampel berjumlah 79 orang sebagai responden. Metode pengumpulan data pada penelitian ini adalah kuesioner. Teknik analisis data yang digunakan adalah analisis regresi linear berganda. Berdasarkan hasil analisis disimpulkan bahwa budaya organisasi dan komitmen organisasi berpengaruh positif dan signifikan terhadap kinerja pegawai Universitas PGRI Palembang. Kata Kunci: Budaya Organisasi, Komitmen Organisasi, Kinerja Pegawai ABSTRACT This study aims to analyze the effect of organizational culture and organizational commitment on the performance of Palembang PGRI University employees. The population in this study were all administrative employees at PGRI Palembang University. Sampling using the proportionate stratified random sampling technique amounted to 79 people as respondents. The data collection method in this study was a questionnaire. The data analysis technique used is multiple linear regression analysis. Based on the results of the analysis it was concluded that organizational culture and organizational commitment had a positive and significant effect on the performance of PGRI Palembang University employees. Keywords : Organizational Culture, Organizational Commitment, Employee Performance
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