Modeling Si/SiGe/Si Quantum Well Solar Cell Using Different Well Width and Mole Fraction

Quantum Well Solar Cell ( QWSC) was proposed as a means to achieve higher efficiencies compare with conventional monolithic solar cell structures. Quantum well formed by adding lower band gap material within intrinsic region of p-i-n solar cell with less than 100 A thicknesses. In this research, five structure of QWSC device were designed with different quantum well thickness. Each structure using different SiGe mole fraction in order to achieve the influence of mole fraction variation to quantum efficiency (QE). Parameters of SiGe in simulations were obtained from various references to use with PC1D and Simwin Software. From simulation result, quantum efficiency will increase from mole fraction 0.2 (84.5135 %) until reaching maximum efficiency at mole fraction 0.75 (91.5703 %). Quantum efficiency begin to decrease at mole fraction higher than 0.75. At mole fraction 0.85 quantum efficiency equal to 90.4830 % and at mole fraction 0.95 quantum efficiency sharply become 71.6327 %.Index Terms— Solar cell, quantum well solar cell, SiGe

Analisis Implementasi Load Balancing Dengan Metode Source Hash Scheduling Pada Procol SSL

The Course programming period give the highest load for academic server (SIAM) of UB. More than 65000 student will access the system concurrently. There for, the load balancing mechanism is required to improve system capacity and prevent the access failure SIAM using SSL mechanism to provide protection for academik data transaction. SSL do the handshaking process to maintain the connectivity of the web browser. In addition, the client and the server will establish a session recording mechanism to keep the identity of a connection to prevent repeat login. This study tried to implement a source-hash scheduling mechanism on the load balancing system. This mechanism subjected to prevent the termination of a session connection which has been formed. The results shows that the source hash scheduling has increased the capacity of the system to handle as many as 9.02594 million requests from 65 087 different IP within 1 day. And provide total data throughput of 169 537 010 395 Bytes (169 GB) in a single day getIndex Terms—Load Balancing, Source Hash Schedulin

Efektifitas Kebijakan Moneter terhadap Inflasi di Indonesia

The purpose of this research is to determine the effect of monetary policy through the discount rate and reserve requirement by the Central Bank as well as the previous inflation towards the inflation rate, and to investigate the effectiveness of monetary policy through the discount rate and reserve requirement as well as the previous inflation in influencing the rate of inflation. The data that is used to determine the discount rate and reserve requirements affect inflation in Indonesia is using multiple linear regression model with the approach of the Partial Adjustment Model (PAM) and statistical (partial, simultaneous tests and the coefficient of determination) as well as classical assumption or econometrics (test normality, linearity, autocorrelation, multicolinearity and heteroscedasticity). From these results, it is known that monetary policy from the first quarter 1985 to first quarter 2010 was still less effective direct influence on inflation, this can be known from a partial test done even though the relationship of monetary policy is consistent with monetarist theory. Keywords: inflation, discount rate, reserve requiremen

Komunikasi Persuasif Guru dalam Membangun Kreativitas Anak Usia Dini pada Tk Melati Putih Desa Bukit Kratai

This the is under the guildance of father Ir. Rusmadi Awza, S.Sos, M.SiWhite jasmine TK school is the frits school kindergarten in the village Kratai hill. Inthis study the quthors wanted to see how persuasive comunication teacher in earlychildhod creativity to build on TK White Jasmine.As for the purpose of this research is to know: 1) learning methodsapplied at school TK White Jasmine. 2)To devermine the components of the learningcurriculum that is in White Jasmine TK. Research uning descriptive qualitatifresearch method informen that has been set using purposive sampling method amongthe principal TK, TK two permanent teachersin budget parents, students TK WhiteJasmine. Data celecting interviews, observation, and documentation. Results of thestudy stated that the method applied learning school TK White Jasmine.so buildchildren creativity in developthing their thinking at an early agel. The learningmethods inclued : preparation of teachers in the learning process, control andassesment techniquen, build confidance in learning, learning how to build creativitychildren. And the role of theachers in a creative game in curriculum componentsapplied in school TK White Jasmine include : the development of the curriculumstucture, curriculum, princeples of curriculum development,aswellascomponentofthecurriculum.Keywood : Communication teacher in kreativity childhoo

Interpretasi Struktur Bawah Permukaan Data Gayaberat Menggunakan Algoritma Jaringan Saraf Tiruan Studi Kasus Daerah Panas Bumi Ungaran, Jawa Tengah

Artificial neural networks have been used in an application of geophysical such as seismic, electromagnetic, restivity, and gravity. In this study, artificial neural network system used is the method of propagation of gravity to produce anomalies corresponding to the desired anomalies on the geothermal area of Mount Ungaran, Central Java. In the training process to produce the best weight with 4 hidden layer with a correlation coefficient of 0.99 and the testing process using the results of the best training with a correlation coefficient of 0.97 and a yield value that resembles Bouguer anomaly in the research area., so it can be seen under the surface of the structure with the results of the best network where there is a high density value of 2.70 to 2.80 g/cm3 in lava basalt as geothermal systems Mount Ungaran. Density 2.40 to 2.80 g/cm3 Low contained in the surface area of Mount Ungaran with the majority of sedimentary rocks of andesitic pyroclastic products of Mount Ungaran Young

Identifikasi Kualitas Perairan Di Sungai Kahayan Dari Keberadaan Sistem Keramba Studi Kasus Sungai Kahayan Kecamatan Pahandut Kalimantan Tengah

Air merupakan sumber daya alam yang memenuhi hajat hidup orang banyak sehingga perlu dilindungi agar dapat bermanfaat bagi hidup dan kehidupan manusia serta mahkluk hidup lainnya. Sungai Kahayan yang berada di Kec. Pahandut Provinsi kalimantan Tengah yang merupakan salah satu sumber air berupa daerah aliran sungai yang rentan terhadap pencemaran, khususnya dari aktivitas sistem keramba ikan yang menyebabkan penurunan kualitas air di perairan akibat dari sisa pakan dan kotoran yang apabila terdegradasi oleh mikroorganisme pengurai akan meningkatkan konsentrasi nutrient berupa nitrat dan fospat. Tujuan dari penelitian ini untuk mengetahui status kualitas air dilihat dari DO, pH, BOD, dan kandungan amoniak (NH3) yang berada di perairan Sungai Kahayan yang didukung dengan parameter kecerahan, kedalaman, dan kecepatan arus. Sampling dilakukan di 5 stasiun mulai dari Jembatan Kahayan sampai dengan Pembataan yang dipilih secara purposive. Pengukuran dan pengambilan sampel dilakukan pengukuran langsung dilapangan (in situ) dan di laboratorium (ex situ). Analisis data dilakukan dengan menggunakan metode environment quality index (EQI). Status kualitas air diperairan Sungai Kahayan berdasarkan metode environment quality index (EQI) tergolong dalam kelas I dimana kisaran nilai KA yang rata-rata berada pada 0,21 – 0,40 yaitu tergolong buruk, menurut PP no 82 Tahun 2001 kualitas air Sungai Kahayan masih belum sesuai dengan kriteria baku mutu air kelas I. Nilai parameter DO dan pH masih mendekati ambang baku mutu yang berkisar (kisaran 4,63 mg/L -6,20 mg/L), dan (5,06-6,09) namun NH3 dan BOD masih jauh dalam baku mutu air minum yaitu (0,62 mg/L -1,02 mg/L), dan (4,20-12,62 mg/L). Hasil penelitian menunjukkan bahwa sistem keramba yang ada di Sungai Kahayan menyebabkan penurunan kualitas air, khususnya meningkatkan parameter BOD, dan kandungan amoniak (NH3)