304 research outputs found

    Finite-element simulations of hysteretic ac losses in a magnetically coated superconducting tubular wire subject to an oscillating transverse magnetic field

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    Numerical simulations of hysteretic ac losses in a tubular superconductor/paramagnet heterostructure subject to an oscillating transverse magnetic field are performed within the quasistatic approach, calling upon the COMSOL finite-element software package and exploiting magnetostatic-electrostatic analogues. It is shown that one-sided magnetic shielding of a thin, type-II superconducting tube by a coaxial paramagnetic support results in a slight increase of hysteretic ac losses as compared to those for a vacuum environment, when the support is placed inside; a spectacular shielding effect with a possible reduction of hysteretic ac losses by orders of magnitude, however, ensues, depending on the magnetic permeability and the amplitude of the applied magnetic field, when the support is placed outside.Comment: 7 pages, 4 figure

    Sedimentasi Pertemuan Dua Buah Sungai Pada Sungai Mangkauk Dan Sungai Riam Kiwa

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    Naturally river's function as experienced basin to transport water from its stream area and conduct in gravitation to lower area. As water source which can be used for the irrigation of, agriculture, drinking water, industrial, energy generating, transportation. This research aim to give the analysis form and place of where there are sediment load which is there in the meeting of Riam Kiwa River and Mangkauk River which is resulted by the existence of wide difference of dimension of the river and stream speed. Method used to calculate basic speed, sediment with Van Rijn method, because entangling factor speed of the river flow and basic sediment concentration.From solution result got the following conclusion: stream speed, wide and form the river very influencing to the number of sediment which can be lifted and precipitated by current, sediment item which have diameter to smaller than 2,0 mm earn is easily brought by river stream, and form the river meeting very influencing of pattern of sediment that happened. Therefore the importance of furthermore research about sediment in the river, particularly at two river cross

    Penentuan Elevasi Dasar Lah an Pertanian Berdasarkan Pada Kisaran Pasang Surut Air Laut Pada Lokasi Unit Kecamatan Barambai

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    Produksi pangan di Propinsi Kalimantan Selatan yang merupakan salah satu lumbung padi nasional berasal dari persawahan pasang surut yang terletak disepanjangkanan/kiri sungai Barito bagian hilir. Berbagai masalah sering muncul menjadi kendala bagi budidaya pertanian dipersawahan pasang surut,antara lain masalah keasaman, salinitas dan kurangnya ketinggian muka air untuk mencapai lahan pertanian, sering disebabkan oleh sistem tata air yang kurang tepat, semua permasalahan diatas muncul sebagai akibat dari tidak tepatnya dalam menentukan elevasi dasar lahan pertanian, penentuan elevasi dasar lahan pertanian adalah merupakan faktor utama dari semua perencanaan terhadap lahanpertanian. Dalam penentuanelevasi dasar pertanian dilahan pasang surut banyak dipengaruhi oleh kisaran pasang surut air laut.Penelitian yang dilakukan mempunyai tujuan untuk mengetahui bagaimana penentuan elevasi dasar lahan pertanian berdasarkan pada kisaran pasang surut air laut. Berapa besar kisaran pasang surut pasang surut air laut yang tepat untuk lahan pertanian yang akhirnya dapat merencanakan system tata air yang tepat.Hasil dari penelitian menunjukkan bahwa nilai Formzaki untuk Barambai adalah 3,062 hal ini menunjukkanbahwa daerah Barambai adalah pasang surut harian tunggal/diurnal tide termasuk type luapan C. Berdasarkan dari kisaran pasang surut tersebut akan memudahkan dalam penentuan elevasi lahan pertanian dalam mengatur siste muka air. Diharapkan dari penelitian ini adalah sebagai sebagai sumbangan pemikiran secara ilmiah bagi pemerintah daerah Kabupaten Batola dalam peningkatan produktivitas pangan pada daerah lahan rawa dengan menentukan elevasi dasar lahan pertanian sebagai salah satu system pengelolaan tata air yang tepat

    Developing high performance polymeric nano-composites for tribological applications

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    Polymers and their composites have been widely applied in different industrial sectors as alternatives to conventional metal-based materials, for the better performance of the system, increasing efficiency and cutting down operational costs. In those applications polymeric materials are sometime subjected to tribological loading conditions where external lubricants are not permissible and polymers’ self-lubricating ability is desirable in such tribo-contacts. In particular, high temperature is often the key factor determining the working conditions of polymers. Hence, high performance polymers (HPPs) have received increasing attention in last decades. In view of above-mentioned facts, the present research investigated the tribological performance of some important engineering polymers and their nanocomposites such as epoxy, PEEK, PPP and PBI. For example, nano-silica (SiO2), nano-rubber (CBTN) and titanium dioxide (TiO2) nano-particles have been incorporated in thermosetting epoxy resin and PEEK, respectively, to improve their tribological properties. To explore the effect of harsh environments during sliding wear, pin-on-disk tests of above-mentioned materials were carried out in dry, wet and elevated temperature regimes. Finally, attempts have been made to establish correlations between the basic mechanical properties of HPPs and their sliding wear behaviour. Various wear models to correlate the tribological aspects of HPPs and polymer nanocomposites with associated mechanical properties were examined along with experimental validation. In addition to that, underlying wear mechanisms were taken into account towards model developments. To develop a quantitative solution for wear prediction, the new computer techniques such as artificial neural network (ANN) may be helpful in the area. Accordingly, the ANN was employed to find the general wear trend of materials

    Studi Drainase Berwawasan Lingkungan Untuk Jalan Pangeran Antasari Banjarmasin

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    Pangeran Antasari road which located in Eastern District of Banjarmasin frequent damage to roads due to drainage channels do not function properly , resulting in a puddle of water on the road . Therefore drainage planning is a good way on the road , in order to determine the design rainfall and discharge large plan dimensions of effective drainage on the road .This anaysis use rainfall data and calculate the maximum that would be obtained by Log Pearson III methods . It is examined in conformance testing , after that recalculated rainfall to rainfall intensity obtained by the method Mononobe . The area of the drainage channel is calculated per section and see the conditions in the field can then be used to calculate water discharge plan using rational methods that will be used to plan the dimensions of good drainage and economical as well as applying the concept ekodrainase.In the cross-sectional results of drainage planning on Prince Street Antasari water discharge plan obtained ranged from 0.7317 to 1.631 m2/sec for left and right channels on Pangeran Antasari road planned Square -shaped channel . with 3 ( three ) comparisons : ( 1 ) precast concrete channel with reference steel ( N = 0,011 ) with the cross-sectional area ranged from 0.5802 to 0.7296 m2 right channel and left channel 0.5033 to 0.7836 m2 . ( 2 ) soil Channel created by Excavator ( N = 0028 ) with cross-sectional area ranged from 0.8237 to 1.0803 m2 right channel and left channel 0.7145 to 1.1124 m2 . ( 3 ) Channel masonry ( N = 0.03 ) with the right- channel cross-sectional area ranged from 0.8453 to 1.1086 and from 0.7332 to 1.1416 m2 left channel

    Strategi Peningkatan Kinerja dengan Metode Balanced Scorecard di Rumah Sakit Umum Daerah Kabupaten Ogan Ilir

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    Pengukuran kinerja adalah penentuan secara periodik efektifitas operasional suatu organisasi, bagan organisasi, dan karyawannya berdasarkan sasaran standar dan kriteria yang telah ditetapkan sebelumnya. Salah satu metode pengukuran kinerja yang mengaitkan strategi didalam penerapannya adalah metode Balanced Scorecard. Penelitian ini bertujuan untuk mengetahui kinerja RSUD Kabupaten Ogan Ilir ditinjau berdasarkan empat perspektif dalam metode Balanced Scorecard yaitu perspektif keuangan, pelanggan, proses bisnis internal, serta pembelajaran dan pertumbuhan, serta mengaplikasikan metode Balanced Scorecard pada penyusunan strategi peningkatan kinerja di RSUD Kabupaten Ogan Ilir. Jenis penelitian ini berupa penelitian deskriptif dengan pengkombinasian dua metode (kualitatif dan kuantitatif) dalam satu penelitian. Jumlah sampel sebanyak 46 orang pegawai dan 110 orang pasien sebagai responden penyebaran kuesioner. Hasil penelitian didapatkan kinerja perspektif pelanggan dengan nilai 41,6% termasuk dalam kondisi kurang baik, perspektif keuangan dengan nilai 50% kondisi kurang baik, perspektif proses internal dengan nilai 32,3% kondisi kurang baik, dan perspektif pembelajaran & pertumbuhan dengan nilai 41,6% kondisi kurang baik. Kinerja RSUD Kabupaten Ogan Ilir dengan nilai Total Skor 41,44% termasuk dalam kondisi kurang baik. RSUD Ogan Ilir perlu meningkatkan kinerja dengan sasaran strategis perspektif pelanggan yaitu meningkatkan kepuasan pasien, loyalitas pasien, dan meningkatkan kunjungan pasien. Sasaran strategis perspektif proses bisnis internal; inovasi layanan, meningkatkan mutu proses layanan, meningkatkan kinerja operasional. Sasaran strategis pespektif keuangan; pertumbuhan pendapatan, dan minimalisir biaya. Sasaran strategis perspektif pembelajaran dan pertumbuhan; meningkatkan kepuasan karyawan, komitmen, motivasi dan kapabilitas karyawan

    Massive pulmonary embolism in patients with extreme bleeding risk: a case series on the successful use of ultrasound-assisted, catheter directed thrombolysis in a district general hospital

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    This is the final version. Available from the publisher via the DOI in this record.Massive pulmonary embolism (PE), characterised by profound arterial hypotension, is a life-threatening emergency with a 90-day mortality of over 50%. Systemic thrombolysis can signifcantly reduce the risk of death or cardiovascular collapse in these patients, by around 50%, but these benefts are ofset by a fvefold increased risk of intracranial haemorrhage and major bleeding, which may limit its use in patients at high risk of catastrophic haemorrhage. We describe a case series of 3 patients presenting with massive PE, each with extreme risk of bleeding and contra-indication to systemic thrombolysis, treated successfully with ultrasound-assisted, catheter directed thrombolysis (U-ACDT). Our experience of this novel technique using the EkoSonic Endovascular System (Ekos, BTG, London, UK) on carefully selected patients has demonstrated the potential to improve clinical status in shocked patients, with minimal bleed risk. There have been several clinical studies evaluating the Ekos system. Both the ULTIMA and SEATTLE II studies have shown signifcant reductions in RV/LV ratio by CT scanning when compared to standard anticoagulation in patients with intermediate-risk PE, with minimal bleeding complications. However, there is a pressing need for a randomised trial demonstrating improvement in robust clinical outcomes when comparing U-ACDT to simple anticoagulation. We believe that this case series adds new insight and highlights the potential of catheter directed thrombolysis in this high-risk patient cohort and consideration should be made to its use in cases where systemic thrombolysis is felt to be too high ris

    Extension of an automatic building extraction technique to airborne laser scanner data containing damaged buildings

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    Airborne laser scanning systems generate 3-dimensional point clouds of high density and irregular spacing. These data consist of multiple returns coming from terrain, buildings, and vegetation. The major difficulty is the extraction of object categories, usually buildings. In the field of disaster management, the detection of building damages plays an important role. Therefore, the question arises, if damaged buildings can also be detected by a method developed for the automatic extraction of buildings. Another purpose of this study is to extend and test an automatic building detection method developed initially for first echo laser scanner data on data captured in first and last echo. In order to answer these two questions, two institutes share their data and knowledge: the Institute of Photogrammetry and Remote Sensing (IPF, Universität Karlsruhe (TH), Germany) and the MAP-PAGE team (INSA de Strasbourg, France). The used 3D LIDAR data was captured over an area containing undamaged and damaged buildings. The results achieved for every single processing step by applying the original and the extended algorithm to the data are presented, analysed and compared. It is pointed out which buildings can be extracted by which algorithm and why some buildings remain undetecte
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