Pool boiling on modified surfaces using R-123

This article has been made available through the Brunel Open Access Publishing Fund.Saturated pool boiling of R-123 was investigated for five horizontal copper surfaces modified by different treatments, namely, an emery-polished surface, a fine sandblasted surface, a rough sandblasted surface, an electron beam-enhanced surface, and a sintered surface. Each 40-mm-diameter heating surface formed the upper face of an oxygen-free copper block, electrically heated by embedded cartridge heaters. The experiments were performed from the natural convection regime through nucleate boiling up to the critical heat flux, with both increasing and decreasing heat flux, at 1.01 bar, and additionally at 2 bar and 4 bar for the emery-polished surface. Significant enhancement of heat transfer with increasing surface modification was demonstrated, particularly for the electron beam-enhanced and sintered surfaces. The emery-polished and sandblasted surface results are compared with nucleate boiling correlations and other published data. © 2014 Syed W. Ahmad, John S. Lewis, Ryan J. McGlen, and Tassos G. Karayiannis Published with license by Taylor & Francis

Design of Monopole Antennas for UWB Applications

Presented are the design method, equations, and results of a broadband monopole antenna for UWB applications. The antenna is a fat monopole; made of rectangular and circular patches. Measured results show a passband of 2.8–11.97 GHz. Parametric studies of the effects of the ground plane and the gap between the radiating element and the ground plane were done and their results given. The gain and efficiency are also provided; with average values of 4.34 dBi and 96% respectively. The obtained radiation patterns show bi-directional patterns in the E-plane and omni-directional patterns in the H-plane

Peran Negara Dalam Mengoptimalkan Zakat Di Indonesia

Zakat has strategic potential to be developed into an instrument of income distribution. In Indonesia, its potential is not professionally managed. This paper examines the reality of the optimization of zakat in Indonesia to know the development of its management, its practice management and its distribution as well as the role of the State using charity funds to alleviate poverty. In the matter of charity, maximizing both the state\u27s role as regulator to revise Act No. 38 of 1999 on Zakat Management, as a facilitator for the optimization of application management functions, the use of information technology in the management of alms and as a motivator for socialization, education, guidance, and conscious movement of zakat and the role of the state as a distributor to apply the model of equal distribution and eight channels growth for productive activities is very significant to note. Zakat memiliki potensi strategis untuk dikembangkan menjadi salah satu instrumen pemerataan pendapatan. Di Indonesia, potensi zakat belum dikelola secara profesional. Tulisan ini bermaksud mengkaji realita optimalisasi zakat di Indonesia untuk mengetahui perkembangan pengelolaan zakat, praktek pengelolaan dan penyaluran zakat, serta peranan negara menggunakan dana zakat untuk mengentaskan kemiskinan. Dalam persoalan zakat, maksimalisasi peran negara baik sebagai regulator untuk merevisi UU No 38 Tahun 1999 Tentang Pengelolaan Zakat, sebagai fasilitator untuk optimalisasi penerapan fungsi manajemen, penggunaan teknologi informasi di dalam pengelolaan zakat dan sebagai motivator untuk melakukan sosialisasi zakat, pendidikan, pembinaan, maupun gerakan sadar zakat serta peran negara sebagai distributor untuk menerapkan model pemerataan dan pertumbuhan delapan jalur untuk kegiatan produktif sangat signifikan untuk diperhatikan

Humanisme Religious Sunan Drajat sebagai Nilai Sejarah dan Kearifan Lokal

Artikel ini bertujuan untuk membahas ajaran Sunan Drajat sebagai sebuah nilai sejarah dan kearifan lokal. Daerah Lamongan utara merupakan tempat penyebaran agama Islam oleh Sunan Drajat yang merupakan salah satu Walisongo. Sunan Drajat menyebarkan ajaran agama Islam melalui pandangan humanisme. Humanisme Sunan Drajat diabadikan melalui ajaran pepali pitu yang tersusun melalui tujuh sab tangga menuju makam. Humanisme Sunan Drajat merupakan humanisme religious yang memandang bahwa aspek kemanusiaan dilihat berdasarkan tiga komponen utama, yaitu: pribadi, sosial, dan spiritual. Humanisme religious Sunan Drajat mempunyai relevansi dengan proses perkembangan manusia sebagai makhluk yang terpilih. Manusia memiliki sisi pribadi yang terus berkembang sejalan dengan pengakuan secara sosial. Perkembangan manusia dalam dilengkapi dengan komponen spiritual sebagai bentuk kecerdasan emosional

Mapping of soil banks using ERTS-1 pictures

Earth Resources Technology Satellite (ERTS-1) pictures of different wavelengths (MSS 4,5,6,7) were used in the study of two strip mine areas in southeastern Ohio. The first area was near Piedmont Lake and the second area was near New Lexington. Prints were examined under a binocular microscope and the gray tone was correlated with the actual ground conditions at several sites. For the New Lexington area, color infrared pictures taken at an elevation of 18,000 feet were also used for correlation with the ERTS-1 imagery. The results indicate that MSS 5 and 7 are most useful in defining the stripped land and show that the hydrological and soil characteristics are remarkably different than the surrounding lands

Lifetime Constraints for Late Dark Matter Decay

We consider a class of late-decaying dark-matter models, in which a dark matter particle decays to a heavy stable daughter of approximately the same mass, together with one or more relativistic particles which carry away only a small fraction of the parent rest mass. Such decays can affect galactic halo structure and evolution, and have been invoked as a remedy to some of the small scale structure-formation problems of cold dark matter. There are existing stringent limits on the dark matter lifetime if the decays produce photons. By considering examples in which the relativistic decay products instead consist of neutrinos or electron-position pairs, we derive stringent limits on these scenarios for a wide range of dark matter masses. We thus eliminate a sizable portion of the parameter space for these late decay models if the dominant decay channel involves Standard Model final states.Comment: 13 pages, 7 figures. Replaced to match published version. Discussion expanded. References added. Accepted by Phys. Rev

Pemberdayaan Petambak Garam Melalui Program Pemberdayaan Usaha Garam Rakyat (PUGAR) Di Kabupaten Brebes Tahun 2011-2014

The wood craft industry is one of business that has a big contribution in Jepara\u27s economy. The wood craft industry GDP\u27s value higher than others make this industry has been choosen by majority of Jepara people. Moreover, because so strong products created on the national of International scene, Jepera City has a nickname “Carving Center”. In this case, researcher would try to investigate what is the role of Jepera\u27s Local Goverment in Keeping the continuity and existance of wood craft industry in “Carvung Center”.The goal of this research is to know the roles performed by Jepara local goverment in keeping continuance and the existance of wood craft industry. This research is a type of qualitative research. Than type of research used in this research is descriptive analytic research. The data capture through interviews and and Departement of Industry and Comerce Jepara\u27s documents.Based on research result, it is known that the role of Jepara\u27s local goverment in keeping the existance of wood craft industry divided into 3 funtions, those are as regulatory policies, facilitatory, and motivator. As regulatory policies, the local goverment has published Perda No. 17 year 2013 about industry potection. Then as facilitators, the local goverment often has contribution to advance the wood craft industry enterprises. One of which is increas the quality of Human Resources. The activities of the local goverment in order to improve the quality of human resources are training, aid equipment and apprenticeship for craftsmen and entrepreneurs. Then, the last is motivator for wood craft industry, the local goverment has built cooperative relationship with institutions that take care of the wood craft industry.Research that has been done to provide information that in keeping the existance of wood craft industry in Jepara, local goverment have contribute and carry out takes according to their working area. But, one thing that needs to be underline that is basically the wood craft industry needs regulations that give special attention to wood craft industry. Because with the rules that focus in wood craft industry can walk up. Therefore, when there issue and problems that arise and threaten the survival of the wood craft industry in Jepara can be overcame well

On universality of the coupling of neutrinos to Z

We employ an effective Lagrangian approach and use LEP data to place severe bounds on universality violations of the couplings of $\nu_e$, $\nu_\mu$, and $\nu_\tau$ to the $Z$ boson. Our results justify the assumption of universality in these couplings that is usually made, as for example in the analysis of solar neutrinos detected at SNO.Comment: 8 pages, no figures. A few comments added. It matches version to be published in PR

Inkjet Printed Bandpass Filters and Filtennas using Silver Nanoparticle Ink on Flexible Substrate

This paper presents an inkjet printed CPW filtenna designed at 5.8 GHz. The proposed structure consists of a CPW pseudo-interdigital bandpass filter and a CPW inset-fed antenna. The bandpass filter is fabricated using inkjet printing technology. The structure is printed on flexible Kapton substrate with polyimide film using silver nanoparticle ink. The filter is then used to suppress the spurious harmonics of the antenna. Measurements from the fabrication confirm the accuracy of the design method and the simulation results

Peranan Pendidikan Technopreneurship Untuk Pembangunan Berkelanjutan: Studi Konseptual

This paper describes a technological business incubation model, developing integrated curriculum with technopreneurship education, as well as the involvement of Industrial Engineering of Tarumanagara University to create technology startup ecosystem. University holds the important role for enhancing technopreneurs in Indonesia. Academics or researchers as technology transfer agents, are responsible to disseminate technology entrepreneurship education broadly. Eventually, technological business incubator will able to accelerate commercialization of innovations or inventions from university researchs