Hybrid Nanostructured Porous Silicon-Silver Layers for Wideband Optical Absorption

As subwavelength nanostructures are receiving increasing attention for photonic and plasmonic applications, we grew nanostructured porous silicon (n-PS) and hybrid n-PS/Ag layers onto silicon substrates and measured their reflection and absorption characteristics as functions of the wavelength, angle of incidence, and polarization state of incident light. The experimental results show that the absorption characteristics of the hybrid n-PS/Ag layer can be controlled by selecting the appropriate combination of its thickness and porosity, together with the density of infiltrant silver nanoparticles. The observed wideband optical absorption characteristics of the hybrid n-PS/Ag layers might be useful in light-harvesting devices and photodetectors, since the overall efficiency will be increased as a result of increased field-of-view for both s- and p-polarization states of incident lightR.J.M.-P. thanks Ministerio de Educación, Cultura y Deporte (Spain) for funding under grant reference number PRX17/00095. P.D.M. and A.L. thank the Charles Godfrey Binder Endowment at Penn State for continued support of their research activities. R.R. thanks the Egyptian Ministry of Higher Education, Missions section, for funding under Joint Supervision grant, call 2015–201

Uji Prestasi Mesin Pendingin Kompresi Uap yang Menggunakan Refrigeran R22 dengan Metode Pengujian Aktual dan Simulasi

Sistem pengkondisian udara yang mengatur temperatur dan kelembaban udara dalam ruangan, dalam pengoperasiannya membutuhkan refrigeran yang mudah menyerap dan melepaskan kalor. Setiap refrigerant memiliki karakteristik yang berbeda-beda yang mempengaruhi efek refrigerasi dan koefesien prestasi yang dihasilkan. R 22 adalah salah satu refrigeran yang memiliki karakteristik yang baik pada mesin pendingin. Software Genetron properties adalah sebuah software simulasi yang dapat menghitung aliran fluida atau refrigerant pada mesin pendingin. Genetron properties melakukan simulasi termodinamika untuk siklus kompresi uap dan memberikan hasil dalam bentuk tabulasi dan pada diagram Mollier diagram (h-s diagram). Pengujian prestasi mesin pendingin yang menggunakan R-22 dilakukan secara aktual dan simulasi dengan menggunakan software genetron properties. Hasil pengujian dan perhitungan menunjukkan bahwa : Kerja kompresor, COP dan performance factor pada mesin pendingin kompresi uap ketika high speed adalah 0,528 kW, 8,42 dan 0,1187; saat low speed adalah 0,528 kW; 8,52 dan 0,117. COP dari hasil pengujian dengan software genetron properties ketika high speed 2,193 saat low speed 1,415 hal ini dikarenakan mesin pendingin kompresi uap dalam keadaan tidak optima

Rancang Bangun dan Implementasi Alat Ukur dan Sistem Informasi pada Listrik Satu Fasa

Sistem monitoring penggunaan listrik baik secara prabayar maupun pascabayar masih memiliki beberapa masalah, salah satu permasalahan yang terjadi adalah masih kurangnya pengawasan untuk mengetahui seberapa besar penggunaan listrik di suatu rumah atau suatu daerah. Untuk mengatasi permasalahan tersebut, diperlukan sebuah perangkat yang mampu mengukur parameter-parameter pada listrik arus AC (Alternating Current) satu fasa, dan menampilkannya hasilnya dalam suatu sistem informasi, sehingga penggunaan daya listrik dari setiap rumah atau daerah dapat diketahui jumlahnya.Dengan menggunakan papan mikrokontroler Arduino Uno sebagai pengolah datanya, parameter yang dapat diukur oleh perangkat terdiri dari arus, tegangan dan daya, data pengukuran tersebut kemudian dikirim melalui jaringan wireless ke sebuah komputer server, komputer server berfungsi sebagai penyimpanan data hasil monitoring dan mengolah data tersebut menjadi sebuah informasi yang ditampilkan dalam sebuah website.Berdasarkan hasil pengujian pada pengukuran arus didapatkan nilai kesalahan rata-rata sebesar 3,28%, kesalahan rata-rata pengukuran tegangan sebesar 0,39%, pada pengukuran nilai daya didapatkan nilai kesalahan rata-rata sebesar 8,82%. Sedangkan pada proses pengiriman data diperoleh nilai presentase error sebesar 0.1%, dan akurasi data mencapai 100%

Faktor-faktor yang Berpengaruh pada Kepuasan Kerja Auditor (Studi Empiris pada Kantor Akuntan Publik di Daerah Semarang)

The purposefrom this research is examining the influence ofOrganizationalCommitment, Professional Commitment, Job Autonomy andOrganizational-Professional Conflict (OPC) on Auditor\u27s Job Satisfaction.The population of this research is auditors that work in publicaccountant firm located at Semarang, The sample taken from 45 auditorsfrom 8 public accountant firm at Semarang. Method of data collection in thisresearch is using questionnaire. Method of data analysis is reliability and validityanalysis, classic assumption analysis and hypotheses analysis is using linearregression analysis.The result indicates all variables reliable, valid and fulfil classic assumption. Theresult of hypotheses analysis are Organizational Commitment has positive influence but not significantly on job satisfaction, Professional Commitment has positive influence and significantly on job satisfaction, Job Autonomy has positive influence and significantly on job satisfaction and OPC has negative influence and significantly on job satisfaction

Test Equipment Specifications Transistor

In this paper, we design a test apparatus Transistor Specification. Specification is atype of transistor is a transistor and common emitter current reinforcement value ( βDC ). The system will provide information in the form of an LED display emits greenlight when the tested types of NPN transistor and the second LED emits blue lightwhen the tested types of PNP transistors.To test the value of β, whose value is proportional to the display used by the collectorcurrent Ic

Optimasi Parameter Permesinan Terhadap Waktu Proses Pada Pemrograman Cnc Milling Dengan Berbasis Cad/cam

The 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, feed rate and depth of cut. The purpose of this study to know the influence of cutting speed, feed rate 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 the comparison to CNC Milling machine.  The data from experiments was statistically analyzed by ANOVA and Regression methods by software Minitab 16.Results show that the greater feed rate and depth of cut shorten the operation time of machinery, whereas cutting speed is not a significant influence. The depth of cut has the highest contribution to the value of 49.56%, followed by feed rate 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, the feed rate 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 the difference not significant with the value of 0,35%

Theory of Planned Behavior and Whistleblowing Intention

This research examined the theory of planned behavior (TPB) as predictor whistleblowing intention. According to TPB, it is difficult to posit whistleblowing as actual behavior. Whistleblowing is more suited to be posited as intention. Intent means the likelihood of actual behavior occurred. We examined attitude, subjective norms, and perceived behavioral control as TPB variables. We also investigated a few control variables such as colleagues support, organizational support, and fear of retaliation. The online survey was conducted in obtaining data by a web-based questionnaire. Participants of this survey were employees of regional owned East Java bank. The number of respondents was 112 employees from all departments and units. Validity, reliability, regression, and path analysis were used in testing research instrument and several hypotheses. The result showed that attitudes and subjective norms as TPB variables have a significant impact on whistleblowing intention. However, perceived behavioral control does not affect whistleblowing intention. While, among several control variables, only fear of retaliation that has a significant effect on whistleblowing intention. Furthermore, this study also found empirical evidence that knowledge and subjective norms have an indirect effect on whistleblowing intention through attitudes. This research suggests that regional owned East Java bank should provide an environment and channels to support whistleblowing within effectively, especially through protection and/or reward systems, or etc.JEL Classification: D23, G34, L23DOI: https://doi.org/10.26905/jkdp.v23i1.271

Electro-optically tunable microring resonators in lithium niobate

Optical microresonators have recently attracted a growing attention in the photonics community. Their applications range from quantum electro-dynamics to sensors and filtering devices for optical telecommunication systems, where they are likely to become an essential building block. The integration of nonlinear and electro-optical properties in the resonators represents a very stimulating challenge, as it would incorporate new and more advanced functionality. Lithium niobate is an excellent candidate material, being an established choice for electro-optic and nonlinear optical applications. Here we report on the first realization of optical microring resonators in submicrometric thin films of lithium niobate. The high index contrast films are produced by an improved crystal ion slicing and bonding technique using benzocyclobutene. The rings have radius R=100 um and their transmission spectrum has been tuned using the electro-optic effect. These results open new perspectives for the use of lithium niobate in chip-scale integrated optical devices and nonlinear optical microcavities.Comment: 15 pages, 8 figure

In-situ Magnesium Diboride Superconducting Thin Films grown by Pulsed Laser Deposition

Superconducting thin films of MgB2 were deposited by Pulsed Laser Deposition on magnesium oxide and sapphire substrates. Samples grown at 450C in an argon buffer pressure of about 10-2 mbar by using a magnesium enriched target resulted to be superconducting with a transition temperature of about 25 K. Film deposited from a MgB2 sintered pellet target in ultra high vacuum conditions showed poor metallic or weak semiconducting behavior and they became superconducting only after an ex-situ annealing in Mg vapor atmosphere. Up to now, no difference in the superconducting properties of the films obtained by these two procedures has been evidenced.Comment: 10 pages, 4 figure