Measurement of entropy production rate in compressible turbulence

The rate of change of entropy $\dot S$ is measured for a system of particles floating on the surface of a fluid maintained in a turbulent steady state. The resulting coagulation of the floaters allows one to relate $\dot S$ to the velocity divergence and to the Lyapunov exponents characterizing the behavior of this system. The quantities measured from experiments and simulations are found to agree well with the theoretical predictions.Comment: 7 Pages, 4 figures, 1 tabl

Energy flux fluctuations in a finite volume of turbulent flow

The flux of turbulent kinetic energy from large to small spatial scales is measured in a small domain B of varying size R. The probability distribution function of the flux is obtained using a time-local version of Kolmogorov's four-fifths law. The measurements, made at a moderate Reynolds number, show frequent events where the flux is backscattered from small to large scales, their frequency increasing as R is decreased. The observations are corroborated by a numerical simulation based on the motion of many particles and on an explicit form of the eddy damping.Comment: 10 Pages, 5 figures, 1 tabl

Pemberdayaan Pengrajin Kapal Kayu Di Kabupaten Batang Dengan Kkn-ppm Tematik

Kabupaten Batang terletak di pantai utara Jawa Tengah dimana wilayah pesisir kabupaten ini terdapat potensi yang dapat dikembangkan menjadi aset yang berharga bagi bangsa yaitu para pembuat kapal tradisional namun pembuatan desain kapal yang ada memiliki keunggulan dari segi stabilitas dan kamar mesin yang didalam/engine in board. Perlunya pendampingan pada proses produksi agar desain tetap terjaga namun tidak kalah dalam teknologi. Untuk menyelesaikan permalahan tersebut maka tim pengabdian dari Jurusan Teknik Perkapalan akan melakukan kegiatan KKN-PPM tematik. Berdasarkan permasalahan yang ada pada mitra maka pelaksanaan KKN-PPM tematik ini akan dilakukan sosialisasi serta pelatihan penggunaan program Fishipro untuk desain kapal dan konstruksi kapal kayu serta menggunakan program desain kapal Delftship, Maxsurf dan ProCAD untuk desain Propeller. KKN-PPM tematik telah berhasil dilaksanakan di galangan kapal kayu di Karangasem Utara dengan beberapa luaran telah tercapai, baik dalam program kerja mahasiswa KKN-PPM monodisiplin maupun multidisipli

Where surface physics and fluid dynamics meet: rupture of an amphiphile layer by fluid flow

We investigate the fluctuating pattern created by a jet of fluid impingent upon an amphiphile-covered surface. This microscopically thin layer is initially covered with 50 $\mu$m floating particles so that the layer can be visualized. A vertical jet of water located below the surface and directed upward drives a hole in this layer. The hole is particle-free and is surrounded by the particle-laden amphiphile region. The jet ruptures the amphiphile layer creating a particle-free region that is surrounded by the particle-covered surface. The aim of the experiment is to understand the (fluctuating) shape of the ramified interface between the particle-laden and particle-free regions.Comment: published in Journal of Chemical Physic

Pembuatan Peta Zona Nilai Tanah Untuk Menentukan Nilai Indikasi Rata-rata (Nir) Harga Pasar Menggunakan Sistem Informasi Geografis Di Kecamatan Ngaliyan, Kota Semarang (Studi Kasus :Kecamatan Ngaliyan, Kota Semarang)

Zona Nilai Tanah (ZNT) are areas which show the relatively similar value of the terrain and the boundaries of land use are imaginary or real appropriate. Each area of ZNThave a different values based on a comparative analysis of market prices and costs. Considering ZNT based on market value, ZNT can be used for the determination of tariffs in land services, the public reference to the transaction, the determination of compensation, the inventory value of public assets and the assets of the community, monitoring the value and market of land, and the determination reference of Nilai Jual Objek Pajak (NJOP) for PBB (Building and Land Tax), to make it more fair and transparent.Based on Semarang Regional Regulation Number 13 of 2011 on PBB, NJOP is the basis for the determination reference of PBB, which is one of the local revenue that is essential to improve service to the public. Therefore, it is necessary to realize the information value of the land for the functions realization of the land. One if it is map of ZNT.In this study, ZNT maps formed based on the value of the land with the assessment of the masses (not paying attention to property and the specific characteristics of the tax object) and use a comparison of sales (sales comparative), where the object of the tax is to be assessed in comparison with the object value of another tax type is already known.The results of this study is ZNT map that consits of 68 zones of the NJOP data and the transaction survey data. The change difference of transaction land price and NJOP with the low price is 49,45% and the highest price is 768,13%

Analisis Hubungan Variasi Land Surface Temperature Dengan Kelas Tutupan Lahan Menggunakan Data Citra Satelit Landsat (Studi Kasus : Kabupaten Pati)

The continued development of remote sensing technology is characterized by the increasing by number of satellites used for purposes of study that encourages utilization in a variety of fields. NASA Landsat satellite in its development has resulted in several generations, including the most recent Landsat 7 and Landsat 8. Satellite Landsat 8 is a continuation of the Landsat 7 mission, characteristics of the both satellites are almost the same in terms of spatial resolution, spectral and temporal as well as the characteristics of the sensor. Sensors on the satellite is equipped with thermal infrared that can detect surface temperatures.This research conducted in Pati regency. The data used are Landsat 7 and Landsat 8. The purpose of this research was to determine correlation between the variations of land surface temperature with the land cover classes by utilizing remote sensing technology that the method is supervised classification and surface temperature using mono-window brightness temperature method. The results of the processing will be analyzing spatial with zonal statistics, where the output is a minimum value, maximum, average, standard deviation and range of the surface temperature on each unit generated land cover mapping. The results of that value be conducted a comparison between the standard deviation of the range, so the results of these comparisons can be used to determine variations in the surface temperature of the processed results of each land cover generated. The results showed that the surface temperature in the area of research for the month of May 2016 ranged between 29,02°C; in June 2016 ranged between 23,00°C and in July 2016 ranged from 20,92°C. While the correlation between land surface temperatures with land cover classes is performed at the highest temperature encountered on building area and the lowest temperature in the non-agricultural classes. For the lowest surface temperature variations found in waters class, this is indicated by the value of the average ratio between 2σ of the range is 17.16%. While variations in surface temperature is highest on Non-Agricultural class, it is based on the results of the average ratio of between 2σ of the range is 22.23%

Pengembangan Model Pembelajaran Problem Based Learning Berbantuan Webquest dalam Upaya Meningkatkan Hasil Belajar Ekonomi Kelas XI IPS SMA Negeri 6 Surakarta

The aim of the research is to produce learning model problem based learning using the webquest in validity and affectivity to be implemented in SMA Negeri 6 Surakarta in effort to increase the result study in economic subject for the students.The research was used Research and Development Approach (R&D). The procedure of the research was applied reffering to design and development research according to Borg and Gall that contained 6 steps of the development such as: (1) research and information collecting, (2) planning, (3) develop preliminary form of product, (4) preliminary field testing, (5) main product revision, (6) main field testing. The internal validation of learning model problem based learning using the webquest was involved the experts of learning, the experts of learning media, the experts of material and practitioner such as the economic teacher in this school. Though, the external validation was done by tryout learning model problem based learning using the webquest that involved the students of XI IPS class. The subject of this research was the all of eleven grade social sciences SMAN 6 in academic year of 2014/2015 the total of the students was 80. In this reserarch, the sample technique was taken by saturated sampling technique that was the technique to decide samples whether all member of population became the samples. The analysis technique data was used descriptive analysis and statistic inferential analysis.The result of the research showed that: 1. The learning model problem based learning using the webquest was stated valid based on the validity test by the experts, 2. The learning model problem based learning based using the webquest was proved effective to be implemented in learning activity so that it could be to increase the economic study for students

Deteksi Perubahan Tutupan Lahan Dengan Menggunakan Metode Linear Spectral Mixture Analysis Pada Citra Landsat 7 Tahun 2002 Dan Citra Landsat 8 Tahun 2013 (Studi Kasus:klaten, Jawa Tengah)

Land cover has significant and important information for making thematic information, which will serve as a material consideration in making a decision. In this remote sensing can be used to obtain the information. Land cover information can be obtained, from each pixel value object.But in fact often there was pixels a mixture, by using the method linear spectral mixture analysis can be obtained information untill the level of subpixels. The mixing pixel can be overcome using linear separation method by using a data image of Landsat 7 ETM + and Landsat Imagery 8. So that it can be done pure pixel determination and classification of each land cover.The results from this research is endmember fraction of land cover and area of each land cover respectively. Where detectable changes in land cover a broad increase in the swamp of 12,870 Ha, settlement of 16.324 .167 Ha irrigated rice paddiesand amounted to 11,099,786 Ha. While the broad decline occurred in land coverage of the gardens of 5,393,172 Ha, moor of 15.260 206,439 Ha of rice field and rainwater of 5.518 3,945