Radio Monitoring of the Tidal Disruption Event Swift J164449.3+573451. I. Jet Energetics and the Pristine Parsec-Scale Environment of a Supermassive Black Hole

We present continued radio observations of the tidal disruption event SwiftJ164449.3+573451 extending to \sim216 days after discovery. The data are part of a long-term program to monitor the expansion and energy scale of the relativistic outflow, and to trace the parsec-scale environment around a previously-dormant supermassive black hole (SMBH). The new observations reveal a significant change in the radio evolution starting at \sim1 month, with a brightening at all frequencies that requires an increase in the energy by about an order of magnitude, and an overall density profile around the SMBH of rho \propto r^{-3/2} (0.1-1.2 pc) with a significant flattening at r\sim0.4-0.6 pc. The increase in energy cannot be explained with continuous injection from an L \propto t^{-5/3} tail, which is observed in the X-rays. Instead, we conclude that the relativistic jet was launched with a wide range of Lorentz factors, obeying E(>Gamma) \propto Gamma^{-2.5}. The similar ratio of duration to dynamical timescale for Sw1644+57 and GRBs suggests that this result may be applicable to GRBs as well. The radial density profile may be indicative of Bondi accretion, with the inferred flattening at r\sim0.5 pc in good agreement with the Bondi radius for a \sim10^6 M_sun black hole. The density at \sim0.5 pc is about a factor of 30 times lower than inferred for the Milky Way galactic center, potentially due to a smaller number of mass-shedding massive stars. From our latest observations (\sim216 d) we find that the jet energy is E_{iso}\sim5x10^{53} erg (E_j\sim2.4x10^{51} erg for theta_j=0.1), the radius is r\sim1.2 pc, the Lorentz factor is Gamma\sim2.2, the ambient density is n\sim0.2 cm^{-3}, and the projected size is r_{proj}\sim25 microarcsec. Assuming no future changes in the observed evolution we predict that the radio emission from Sw1644+57 should be detectable with the EVLA for several decades, and will be resolvable with VLBI in a few years.Comment: Submitted to ApJ; 22 pages, 2 tables, 9 figure

Aktivitas Dan Kepuasan Pada Penggunaan Media Baru (Hubungan Antara Aktivitas Penggunaan Media Baru Solopos.Com Dan Interaksi Sosial Serta Penggunaan Media Lain Sebagai Media Informasi Dengan Tingkat Kepuasan Dikalangan Mahasiswa Ilmu Komunikasi Ums Angkatan 2009)

Dalam masyarakat yang semakin maju dan berkembang, informasi menjadi sangat penting. Setiap orang, badan dan organisasi berhak untuk memperoleh informasi untuk dapat berkembang dan berinteraksi dengan lingkungannya. Dengan pesatnya perkembangan informasi dan didukung kemajuan teknologi, kebutuhan informasi akan semakin mudah terpenuhi. Sementara itu saat ini internet telah berkembang seiringnya kemajuan jaman yang sudah sangat modern ini. Internet kini menjadi bagian yang tidak di pisahkan dalam perkembangan teknologi komunikasi. Banyak sekali media massa yang saat ini melucurkan versi online-nya seperti contohnya Solopos.com. Dalam perkembangannya Solopos.com merupakan portal berita sehari-hari yang mengupas berita-berita Solo Raya. yang meliputi katagori seni budaya, bisnis, pendidikan, olahraga, sosial, wisata dan gaya hidup. Penelitian ini bertujuan untuk mengetahui apakah ada hubungan antara aktivitas penggunaan media baru dengan tingkat kepuasaan dikalangan mahasiswa ilmu komunikasi UMS angkatan 2009 pada media baru Solopos.com serta apakah ada hubungan diantara keduanya yang dipengaruhi oleh adanya interaksi social dan penggunaan media lain sebagai variabel kontrol. Dalam penelitian ini peneliti menggunakan beberapa teori sebagai penguat hasil penelitian. Salah satu teori yang digunakan adalah teori Uses and Gratification dimana teori ini berangkat dar riset pandangan bahwa komunikasi khususnya media massa tidak mempunyai kekuatan mempengaruhi khalayak. Inti teori Uses and Gratification adalah khalayak pada dasarnya menggunakan media massa berdasarkan motif – motif tertentu. Media dianggap berusaha memenuhi motif khalayak.Pada akhirnya, media yang mampu memenuhi kebutuhan khalayak disebut media yang efektif. Maka dari itu teori Uses and Gratification merupakan alat pengukur tingkat kepuasan khalayak terhadap media. Penelitian dilakukan di Fakultas Ilmu Komunikasi UMS dengan mahasiswa angkatan 2009 sebagai populasinya, sampel yang digunakan dalam penelitian ini adalah sebanyak 59 mahasiswa. Penelitian ini menggunakan pendekatan kuantitatif dengan metode survey. Analis data menggunakan teknik korelasi tata jenjang Kendall. Hasil dari penetian menunjukan bahwa: Terdapat hubungan yang signifikan antara aktivitas penggunaan media baru solopos.com sebagai media informasi dengan tingkat kepuasan penggunaan media yang dipengaruhi adanya interaksi social dan penggunaan media lain dikalangan mahasiswa ilmu komunikasi angkatan 2009 di Universitas Muhammadiyah Surakarta

Hubungan Kemandirian Belajar Dan Kontrol Diri Dengan Disiplin Belajar Mahasiswa Di Masa Pandemi Covid-19

This study aims to find out the picture of the relationship between learning independence and self-control with student learning discipline in the covid-19 pandemic. The hypothesis in this study is the relationship between Independence of Learning and Self-Control with The Discipline of Learning in Students. This research method is a descriptive quantitative method with a measuring tool for learning independence scale, self-control scale and Learning discipline scale. The subjects in this study are the Student Population who have active status, Strata 1 (S1) level semester 1-8 Faculty of Psychology, University of Muhammadiyah Surakarta. Based on the results of the correlation test simultaneously multiple regression variables of learning independence and self-control with the discipline of learning in the covid-19 pandemic, obtained the value Ry12 = 0.926 significance of p < 0.001 means that together the variables of learning independence and self-control have a positive and significant relationship to the student learning discipline in the covid-19 pandemic. Which partially regresses double the variable of learning independence with student learning disciplines in the pandemic covid-19, in the value 0.601 with a significance of p < 0.001 which shows there is a significant relationship between independence of learning and the discipline of studying in the pandemic covid-19. Based on the results of the partial correlation test, double regression of self-control variables with student learning discipline in the covid-19 pandemic period. Obtained a value 0.292 and significance of p < 0.001, thus stating that there is a significant relationship between self-control and student learning discipline in the pandemic covid-19. The ability learning independence to explain the learning discipline variable is 60.1% and the self control variable ability to explain discipline variable is 29.2%. The conclusion of this study is that there is a significant relationship between the independence of learning to student learning disciplines during the covid-19 pandemic, and the existence of a significant relationship between self-control of student learning disciplines during the covid-19 pandemic

Studi Kelayakan Ekonomi Pembangunan PLTD Sistem Dual Fuel dengan Gasifikasi Sekam Padi Kapasitas 50 kVA

Electrification ratio in Special Distric of Yogyakarta in 2015 still under 100%, but 100% villages has been electrified. It shows that several houses which far from village which has not been electrified. The alternative solution is to build a small power plant by utilizing rice husks which are quite abundant in Yogyakarta. Diesel Power Plant (PLTD) by dual fuel system studied had a capacity of 50 kVA. Dual fuel system is combination of diesel fuel and synthetic gas from gasification of rice husks. This study is discussed about potential of rice husks, gasification equipment design, electrical distribution, and economic feasibility studies. The results showed that 0.2% of rice husks in Yogyakarta is enough to fulfill fuel requirements of PLTD by dual fuel system. Comparison of fuel requirements in PLTD by dual fuel system is 40% or about 4.72 liters/hour of diesel fuel and 60% synthetic gas from gasification of rice husk as much as 33.19 kgs/hour. Reactor is designed to fulfill gasification process for 2 hours every batch. The system produced 31.68 kWh distributed to 2 home industries, 48 households with each capacity is 450 VA, and street lighting. Investment to build PLTD by dual fuel system is Rp. 700,310,500.00 and operational &amp; maintenance costs is Rp. 458,196,000.00 per year. The economic feasibility study to build PLTD by dual fuel system is claimed feasible if minimum price of electricity is Rp. 2,417.00 which gain NPV and IRR of Rp. 568,819.00 and 12.03%,respectively and payback period of 4 years

The Roles of Principals in Teacher Competency Development for Students’ Morale Improvement

Education and learning in schools that do not pay attention to students’ morals have had an unfavorable impact on student development. This research aims to track the role of school principals in teacher development to improve students’ morale. It used a qualitative approach that involved the researchers as a research instrument. In collecting data, the principal is the key informant. The other informants were chosen based on the snowball sampling technique. This process continued until the data were saturated. In addition to interviews, research data were collected through observation and written documents. The data collected were analyzed following the steps proposed by Miles and Huberman (1984), such as data reduction, data presentation, and conclusions (illustration/verification). More specifically, data validation was done through triangulation. The results revealed that school principals had fewer roles in developing teacher competencies to improve students’ morale

Persepsi Calon Mahasiswa Baru Terhadap Pelayanan Penerimaan Mahasiswa Baru Universitas Muhammadiyah Surakarta Tahun 2013

Dalam persaingan antara perguruan tinggi baik negri maupun swasta menuntut lembaga pendidikan lebih memperhatikan mutu pendidikan, kelembagaan khususnya pelayanan sehingga dapat mampu unggul dalam persaingan seperti halnya UMS sebagai perguruan tinggi yang mendapat peringkat ke-11 terbaik PTN dan PTS seIndonesia menurut lembaga webometrics. hal tersebut tidak terlepas dari peran serta berbagai pihak salah satunya yaitu panitia penerimaan mahasiswa baru yang bertugas memberikan pelayanan kepada calon mahasiswa pada saat proses berlangsungnya pelayanan. Persepsi dari responden (mahasiswa maupun calon mahasiswa) juga diperlukan karena dapat memperbaiki atau mempertahankan kualitas pelayanan yang telah ada tersebut. Penelitian ini merupakan penelitian deskritif kuantitatif dengan pendekatan survey. Jumlah responden yang dijadikan sampel berjumlah 99 orang hasil dari perhitungan rumus Yamane, sedangkan tekhnik sampel menggunakan Insidental sampling yaitu siapa saja yang secara kebetulan bertemu dengan peneliti dan dipandang cocok sebagai sumber informasi atau sumber sampel. Variabel bebas nya terdiri dari tangibel (x1), reliability (x2), Responsiviness (x3), Assurance (x4), dan emphaty (x5). Sedangkan variabel terikatnya yaitu Persepsi calon mahasiswa baru (Y). Pengujian instrumen dengan menggunakan uji validitas, uji reliabilitas, dan pengujian asumsi klasik, serta metode analisis data menggunakan regresi linier berganda, uji F, dan uji t. Hasil penelitian ini menunjukan bahwa persepsi calon mahasiswa baru terhadap pelayanan sangat positif atau baik ini dibuktikan dengan hasil perhitungan Regresi Linier Berganda yaitu nilai koefisien korelasi R = 0,828; Fregresi = 40,484; p = 0,000 (p < 0,05). Dari hasil tersebut menunjukkan bahwa ada pengaruh yang signifikan antara kualitas pelayanan yang terdiri dari dimensi tangibel (berwujud), dimensi reliability (kehandalan), dimensi responsiviness (respon /tanggapan), dimensi assurance (jaminan), dimensi empathy (empati) dengan persepsi calon mahasiswa baru Universitas Muhammadiyah Surakarta. Sedangkan hasil perhitungan nilai R Square atau koefisien determinan sebesar 0,668, hal ini menunjukkan bahwa variasi perubahan variabel persepsi calon mahasiswa baru dapat dijelaskan dimensi kualitas pelayanan sebesar 66,8%. Sedangkan sisanya sebesar 33,2% dipengaruhi oleh variabel lain yang tidak diungkapkan dalam penelitian ini

KUALITAS PELAYANAN PT POS INDONESIA CABANG BARITO SELATAN

This study was conducted to determine how the quality of service at PT Pos Indonesia branch of South Barito and what efforts are conducted by PT Pos Indonesia branch of South Barito to improve the quality of service to the community . Based on these problems ,the purpose of the study was to describe and analyze the quality of service at PT Pos Indonesia branch of South Barito and the efforts of PT Pos Indonesia to maximize service to the community. The focus of research on the quality of financial services is measured based on five dimensions of service quality that is reability, responsiveness, assurance, empathy, tangibles and the efforts undertaken by PT Pos Indonesia South Barito branch in maximizing service to the community.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This type of research is qualitative research and data collection techniques performed by the method of observation , interviews , and documentation. Subjects of this study were employees of PT Pos Indonesia branch of South Barito and public users of financial services branch of PT Pos Indonesia South Barito . Mechanical analysis of data from this study is data collection , data reduction , data presentation , and conclusion and verification&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Conclusions drawn or obtained from this study indicate that the quality of service of PT Pos Indonesia Branch South Barito still not up to optimum . It can be inferred from the existence of public complaints as users of services provided related services and facilities are incomplete and inadequate

Forty-thousand years of maritime subsistence near a changing shoreline on Alor Island (Indonesia)

We report archaeological findings from a significant new cave site on Alor Island, Indonesia, with an in situ basal date of 40,208–38,454 cal BP. Twenty thousand years older than the earliest Pleistocene site previously known from this island, Makpan retains dense midden deposits of marine shell, fish bone, urchin and crab remains, but few terrestrial species; demonstrating that protein requirements over this time were met almost exclusively from the sea. The dates for initial occupation at Makpan indicate that once Homo sapiens moved into southern Wallacea, settlement of the larger islands in the archipelago occurred rapidly. However, the Makpan sequence also suggests that the use of the cave following initial human arrival was sporadic prior to the terminal Pleistocene about 14,000 years ago, when occupation became intensive, culminating in the formation of a midden. Like the coastal sites on the larger neighbouring island of Timor, the Makpan assemblage shows that maritime technology in the Pleistocene was highly developed in this region. The Makpan assemblage also contains a range of distinctive personal ornaments made on Nautilus shell, which are shared with sites located on Timor and Kisar supporting connectivity between islands from at least the terminal Pleistocene. Makpan’s early inhabitants responded to sea-level change by altering the way they used both the site and local resources. Marine food exploitation shows an initial emphasis on sea-urchins, followed by a subsistence switch to molluscs, barnacles, and fish in the dense middle part of the sequence, with crabs well represented in the later occupation. This new record provides further insights into early modern human movements and patterns of occupation between the islands of eastern Nusa Tenggara from ca. 40 ka

Modulation of endoplasmic reticulum stress and cardiomyocyte apoptosis by mulberry leaf diet in experimental autoimmune myocarditis rats

Mulberry is commonly used as silkworm diet and an alternative medicine in Japan and China, has recently reported to contain many antioxidative flavanoid compounds and having the free radical scavenging effects. Antioxidants reduce cardiac oxidative stress and attenuate cardiac dysfunction in animals with pacing-induced congestive heart failure. Hence we investigated the cardioprotective effect of mulberry leaf powder in rats with experimental autoimmune myocarditis. Eight-week-old Lewis rats immunized with cardiac myosin were fed with either normal chow or a diet containing 5% mulberry leaf powder and were examined on day 21. ML significantly decreased oxidative stress, myocyte apoptosis, cellular infiltration, cardiac fibrosis, mast cell density, myocardial levels of sarco/endo-plasmic reticulum Ca2+ ATPase2, p22phox, receptor for advanced glycation end products, phospho-p38 mitogen activated protein kinase, phospho-c-Jun NH2-terminal protein kinase, glucose regulated protein78, caspase12 and osteopontin levels in EAM rats. These results may suggest that mulberry diet can preserve the cardiac function in experimental autoimmune myocarditis by modulating oxidative stress induced MAPK activation and further afford protection against endoplasmic reticulum stress mediated apoptosis