1,737 research outputs found
First documented record of a living solemyid bivalve in a pockmark of the Nile Deep-sea Fan (eastern Mediterranean Sea)
Full text linkA living specimen of a solemyid bivalve was collected at bathyal depths near a pockmark in the Nile Deep-sea Fan (eastern Mediterranean) and is here presented. Both taxonomic and molecular results suggest a Solemya species but due to the small size of the animal and the lack of molecular data for other solemyid species the species cannot be determined. This is the first record of a living solemyid from deep-sea cold seeps in the Mediterranean Basin.FCT - SFRH/ BPD/64154/2009ANR DEEP-OASES - ANRO6BDV005CHEMECO ESF EURODEEPMPG-CNRS-GDRE - DIWOO
Author Correction: New perspectives on Neanderthal dispersal and turnover from Stajnia Cave (Poland)
Full text linkThe Author contributions section now reads:“W.N., A.N. and S.T. designed research; A.P., M.H., W.N., S.B., M.U., A.M., H.F., M.D.B., P.S., K.S., M.Ż., A.W., A.N. and S.T. performed research; A.P., M.H., W.N., S.B., M.U., A.M., H.F., M.D.B., P.S., K.S., M.Ż., A.W., A.N. and S.T. analysed data; A.P., M.H., S.T., W.N. and S.B. wrote the paper with the collaboration of all the co-authors.
Author Correction:A 41,500 year-old decorated ivory pendant from Stajnia Cave (Poland)
No full textCorrection to: Scientific Reports https://doi.org/10.1038/s41598-021-01221-6, published online 25 November 2021The original version of this Article contained errors in the author list where Marjolein D. Bosch was omitted from the author list, and Mikołaj Urbanowski was incorrectly listed as an author of the original Article, and has subsequently been removed.The Author contributions section now reads:“S.T. W.N. and A.N. conceived the project; S.T., W.N., A.P., M.B., S.C., M.D., H.F., A.M., M.D. B., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H., performed research; S.T., A.P., W.N., M.B., M.D.B., S.C., M.D., H.F., A.M., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H. analysed all archaeological data; S.T. and A.P. wrote the paper with the collaboration of all the co-authors.”The original Article and its accompanying Supplementary Information file have been corrected
Lovecraft and Religion
No full textThe article was originally published as a chapter in S.T. Joshi’s book Lovecraft and a World in Transition: Collected Essays on H. P. Lovecraft (New York: Hippocampus Press 2014, pp. 187-195). The presented version was kindly provided to „Creatio Fantastica” by the Author without any copyright fee and translated into Polish by Magdalena Wąsowicz
Pengaruh Kecepatan Putaran Heatsink Fan Thermoelectric Generator Terhadap Konversi Energi Meso-Scale Combustor
No full textSaat ini miniaturisasi pada teknologi di bidang Micro Electro Mechanical
System (MEMS) menjadi perhatian. MEMS membutuhkan sumber energi yang
memiliki densitasi energi yang tinggi. Bahan bakar yang memiliki densitas energi
tinggi dapat diaplikasikan pada Micro Power Generator (MPG) yang merupakan
pengembangan MEMS pada pembakaran berskala mikro. Panas yang berasal dari
pembakaran berskala mikro/meso dapat diubah menjadi energi listrik dengan
bantuan teknologi Thermoelectric Generator (TEG). MPG dengan menggunakan
media pendingin berupa udara sangat mudah dalam instalasi, murah, tidak
membutuhkan tambahan perangkat dalam perakitan.
Tujuan pada penelitian ini adalah untuk menganalisis pengaruh dari
kecepatan putaran yang dihasilkan oleh heatsink fan dan temperatur cold side dan
hot side yang dihasilkan oleh TEG terhadap konversi energi yang dihasilkan.
Penelitian ini dilakukan dengan memberikan variasi kecepatan putaran heatsink fan
sebesar 5000 rpm, 10000 rpm, dan 15000 rpm sebagai fluida pendingin. Sementara
untuk variasi kecepatan reaktan yang diberikan pada setiap kecepatan putaran
hetsink fan sebanyak 5 kecepatan reaktan yaitu sebesar 31,40 cm/s, 33,10 cm/s,
34,79 cm/s, 36,48 cm/s, dan 38,18 cm/s. Dengan ekuivalen rasio sebesar ϕ = 1 pada
setiap kecepatan putaran yang dilakukan.
Hasil analisa yang didapatkan pada pengujian yaitu adanya variasi
kecepatan dari heatsink fan yang ditentukan akan menghasilkan output daya listrik
yang berbeda pula. Pada temperatur hot side dan cold side tertinggi pada kecepatan
5000 rpm sebesar 77℃ dan 35,5℃. ∆ TEG menunjukkan pada kecepatan 10000
rpm memiliki temperatur tertinggi sebesar 31,48℃. Semakin tingginya kecepatan
reaktan yang dihasilkan, maka semakin tinggi pula temperatur nyala api yang
dihasilkan. Output daya listrik yang dihasilkan tertinggi pada kecepatan 10000 rpm
sebesar 2,464 V untuk tegangan, sedangkan untuk arus listrik sebesar 12,618 mA.
Nilai heatloss yang dihasilkan meliputi sink heat loss, uncovered sides heat loss,
dan exhaust heat loss tertinggi sebesar 36,72%, 30,46%, dan 47,66%. Sedangkan
untuk hasil dari efisiensi maksimal pada kecepatan 10000 rpm sebesar 2,39%.Dosen Pembimbing Utama : Dr. Ir. Andi Sanata, S.T., M.T.
Dosen Pembimbing Anggota : Ir. Hari Arbiantara Basuki, S.T., M.
Experimental research on the effects of surface screens on a mobile bed
No full textIn 2000 the Dutch government chose a new point of view for the Dutch rivers: “Room for the River”. This viewpoint is the basis for a new approach of high water protection in the Netherlands. Instead of strengthening and raising the dikes, solutions must be based on space and spatial quality. One of the suggested measures is the addition of secondary channels. The purpose of these channels is enlarging the conveyance area and the ecological role of the river. Maintaining the profile of these channels involves substantial financial consequences. Finding a sustainable solution for undesired erosion or sedimentation is the main focus of this study. The research question is stated as follows: “How can the undesired erosion or sedimentation in secondary channels be corrected with a temporary but sustainable solution in the form of surface screens?”. The main part of this study is an experimental study on the effects of surface screens on a mobile bed. The design of the physical experiments requires choices about the geometry of the flume. The experiments were carried out with a straight flume and with a dividing wall. Preparing the experiments requires information about the flume facility. The experiments have been carried out in the Environmental Fluid Mechanics Laboratory of DUT. The upstream boundary conditions are discharge and velocity distribution. The downstream boundary condition consisted of a fixed water level. The water level was kept constant along the natural slope of the surface. The experiments consist of taking velocity and bed level. The angle of attack and the penetration depth were chosen to be variable. The angle of attack was varied between 15 and 25 degrees. With these relatively small angles the screen acts as guidance for the flow, instead of an obstruction. The penetration depth was varied between 20% and 60% of the water column. The initial test run determined the optimal measurement duration and the initial equilibrium. Four representative cases have been described in detail, giving support to the general conclusions. The flow pattern changes under influence of the surface screen. The main flow direction is guided by the screen, introducing a transverse velocity at the surface. As flow continuity in the flume has to be maintained, the water near the bottom is forced to have a transverse velocity in opposite direction. Redistribution of the suspended transport and the bottom transport was induced. This generated locations were the actual transport did not meet the transport capacity, which gives rise to morphological changes. Next to the spiral motion the screen had an effect on the longitudinal flow velocities. The attacked side of the flume experiences a higher velocity, thereby having a higher transport capacity. This higher capacity gives rise to local erosion of the bed. At the unattacked side, sedimentation occurs, thereby rising the bed level. In the B-series of the experiment a dividing wall was added. The screen in front of the bifurcation gave rise to the same two processes, but the wall introduced an extra effect. The screen influenced the bifurcation relationship. The bed level adapted to the new conditions. The upstream effect of the bifurcation is explained by changes in water level topography, thereby influencing the backwater curve. In general the wall amplified the morphological development of the bed. Finally some suggestions have been made for the practical application of surface screens. In general the screens can be applied in a (secondary) channel or in front of a bifurcation. The use of a screen inside a channel has an advantage not to interfere with the navigation channel. The advantage of a screen in front of a bifurcation is influencing two channels simultaneously. One of the main disadvantages of the latter is the possibility of disturbing the delicate bifurcation relationship. When carefully implemented this effect can simultaneously be the main advantage of this screen layout, as the morphological response increases.Hydraulic EngineeringCivil Engineering and Geoscience
Pedagogical ideas of S.T. Shatsky
No full textU radu se prate osnovne pedagoške ideje poznatog ruskog i sovjetskog društvenog radnika i pedagoga S. T. Šackog. Članak polazi od osnovnih informacija njegove biografije, neprekidno povezane sa radom u prosveti i razmišljanjima o vaspitanju, prikazujući ih kao podlogu razvoja njegovih pedagoških ideja. Dalji tekst kratko iznosi njegove osnovne ideje u tematskim celinama o kritici škole, cilju vaspitanja, škole budućnosti, predškolskom i vanškolskom vaspitanju, didaktičkim shvatanjima, položaju deteta u vaspitnom procesu, radu učitelja i mestu škole u društvenoj sredini. Rad pokušava da dovede u vezu shvatanja Šackog sa savremenim pogledima na iste probleme. U tekstu se, takođe, može uočiti nekoliko tema za razmišljanje koje su naročito izdvojene u zaključnom delu članka: trajnost pitanja o vaspitanju, odnosno pedagoških problema, mogućnosti ostvarivanja ideja o promeni škole kao institucije vaspitnog sistema, odnos rada u prosveti i društvenog angažovanja.The author discusses the pedagogical ides of a well known Russian and Soviet social worker and pedagogue S.T. Shatsky. The report starts with the basic information from his biography, always in connection with his work in education and his contemplation on education, showing them as a background for the development of his pedagogical ideas. It proceeds by' an account on hid ideas in themes on criticism of school, the objective of education of the school of future, pre school and out of school education, didactic ideas, the position of child in the process of education, the work of the teacher and the place of school in the social milieu. The author attempts to bring together Shatsky's ideas and the modern attitudes to the same problems. The text also offers a number of topics for discussion, especially dealt with in the closing part: the duration of the issue of education, i.e. pedagogical problems, the possibility' of realization of the ideas on the change of school as a institution of education system, the relation of work in education and social engagement
Evaluasi Sistem Proteksi Motor Primary Air Fan Di PLTU Tanjung Jati B Unit 3
Full text linkThe primary air fan is a reliable equipment for electricity production at PLTU Tanjung Jati. Its function is to help speed up the process of burning coal with oxygen (primary air) so that the combustion process is efficient. Electrical equipment such as motors in generators is common and is very susceptible to overcurrent disturbances. Over Current Relay (OCR) is a motor safety relay from overcurrent disturbances by stopping the flow of overcurrent to the load by PMT (circuit breaker). This study aims to provide an evaluation of the error protection system to make it more sensitive, fast, and selective when there is a disturbance. This research was carried out by looking for data from PT PLN Tanjung Jati, studying journal references both national and international, calculating and simulating research-related data. The parameters used in this study include 10 kV working voltage, 2110 kW motor capacity, 88% power factor, 138.43 A nominal current, and inverse longtime curve characteristics. The final results of this study indicate that the over current relay operating time setting that is used is too high for the 3-phase short circuit current so that it damages the motor cable itself. The solution is to reset the operation time of the primary air fan motor OCR relay by changing the TMS value of 0.7 steps and top by 0.8 seconds to TMS of 0.6 steps and top of 0.7 seconds accompanied by a pick-up current of 1.81 steps or 145 A, about 10% of the the working current is 148 A
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