Use of the MultiNest algorithm for gravitational wave data analysis

We describe an application of the MultiNest algorithm to gravitational wave data analysis. MultiNest is a multimodal nested sampling algorithm designed to efficiently evaluate the Bayesian evidence and return posterior probability densities for likelihood surfaces containing multiple secondary modes. The algorithm employs a set of live points which are updated by partitioning the set into multiple overlapping ellipsoids and sampling uniformly from within them. This set of live points climbs up the likelihood surface through nested iso-likelihood contours and the evidence and posterior distributions can be recovered from the point set evolution. The algorithm is model-independent in the sense that the specific problem being tackled enters only through the likelihood computation, and does not change how the live point set is updated. In this paper, we consider the use of the algorithm for gravitational wave data analysis by searching a simulated LISA data set containing two non-spinning supermassive black hole binary signals. The algorithm is able to rapidly identify all the modes of the solution and recover the true parameters of the sources to high precision.Comment: 18 pages, 4 figures, submitted to Class. Quantum Grav; v2 includes various changes in light of referee's comment

Prevalence, fate and effects of plastic in freshwater environments:New findings and next steps

At a time when a global pandemic rightly holds our collective attention, environmental issues have taken a backseat to the ongoing battle against Covid-19 [...

PENGARUH PENDEKATAN BERMAIN TERHADAP MOTIVASI SISWA DALAM PEMBELAJARAN AKTIVITAS BERLARI SPRINT

Latar belakang masalah pada penelitian ini adalah rendahnya motivasi belajar siswa kelas VII A MTs. Al-Hidayah Cukangkawung dalam mengikuti aktivitas pembelajaran aktivitas lari jarak pendek (sprint), sebagai akibat kurang pahamnya fungsi lari jarak pendek. Adapun faktor lain yang dapat mempengaruhi siswa tidak mau atau kurang termotivasi dalam pembelajaran lari jarak pendek adalah kurangnya pengetahuan guru tentang metode pembelajaran yang dapat meningkatkan motivasi siswa. Oleh karena itu untuk meningkatkan motivasi belajar siswa maka peneliti akan menerapkan pendekatan bermain. Tujuan penelitian ini adalah untuk meningkatkan motivasi belajar siswa di dalam pembelajaran aktivitas berlari sprint. Oleh karena ini masalah penelitian yang akan dipecahkan dengan penggunaan atau penerapan pendekatan bermain adalah untuk meningkatkan motivasi siswa. Untuk meningkatkan motivasi belajar siswa peneliti menerapkan: teknik motivasi belajar siswa, dan menerapkan pendekatan bermain. Metode yang peneliti gunakan ialah penelitian tindakan kelas (PTK) dengan menggunakan dua siklus. Subjek dalam penelitian ini ialah siswa kelas VII A MTs. Al-Hidayah Cukangkawung yang berjumlah 38 siswa, 18 siswa putri dan 20 siswa putra. Instrument yang digunakan dalam penelitian ini adalah instrument motivasi belajar aktivitas lari sprint yang berupa angket, observasi, dan wawancara. Hasil penelitian menunjukan bahwa motivasi meningkat dari prasiklus yang hanya 96, siklus I 127, dan siklus yang ke II 143 Berdasarkan hasil pengolahan dan analisis data, diketahui bahwa adanya peningkatan motivasi siswa dalam pembelajaran aktivitas berlari sprint. ;---The background of this research is the lack motivation of class 7 A students at MTs. Al-Hidayah Cukangkawung on participate the sprint subject, as the result is less fngtion understanding of athletic. There is also another factor that affected student motivation on sprint subject. It is the teacher lack knowledge the method of teaching to increase the students motivation. Because of it to increase the students learning motivation then the research will improve approachment game. The aim of this research is to improve student motivation on sprint activity. As the research question will be done using game approachment to improve student motivation. To increase students learning motivation the research will be using: the technic student motivation, and improve approachment game. The research method is using Action Research with two cycles. Sample of this research is students from class 7A at MTs. Al-Hidayah Cukangkawung. There are 38 students, 18 of them are girls, and the other 20 are boys. Instrument used in this research is learning motivation instrument of sprint activity which are questioner, observation, and interview. The result of the questioner on pre-cycle is 96, first cycle is 127, and second cycle is 143. According the analyzed and tabulated data, there is an improvement in student motivation on learning sprint activity

The strength of nuclear shell effects at N=126 in the r-process region

We have investigated nuclear shell effects across the magic number N=126 in the region of the r-process path. Microscopic calculations have been performed using the relativistic Hartree-Bogoliubov approach within the framework of the RMF theory for isotopic chains of rare-earth nuclei in the r-process region. The Lagrangian model NL-SV1 with the inclusion of the vector self-coupling of omega meson has been employed. The RMF results show that the shell effects at N=126 remain strong and exhibit only a slight reduction in the strength in going from the r-process path to the neutron drip line. This is in striking contrast to a systematic weakening of the shell effects at N=82 in the r-process region predicted earlier in the similar approach. In comparison the shell effects with microscopic-macroscopic mass formulae show a near constancy of shell gaps leading to strong shell effects in the region of r-process path to the drip line. A recent analysis of solar-system r-process abundances in a prompt supernova explosion model using various mass formulae including the recently introduced mass tables based upon HFB approach shows that whilst mass formulae with weak shell effects at N=126 give rise to a spread and an overproduction of nuclides near the third abundance peak at A~190, mass tables with droplet models showing stronger shell effects are able to reproduce the abundance features near the third peak appropriately. In comparison, several analyses of the second r-process peak at A~130 have required weakened shell effects at N=82. Our predictions in the RMF theory with NL-SV1, which exhibit weaker shell effects at N=82 and stronger one at N=126 in the r-process region, support the conjecture that a different nature of the shell effects at the magic numbers may be at play in r-process nucleosynthesis of heavy nuclei.Comment: 14 pages, 8 figures; submitted to Physical Review C. Part of this work was presented at Nuclear Physics in Astrophysics II, 20th International Nuclear Physics Divisional Conference of the European Physical Society, at Debrecen, Hungary, May 16-20, 200

The ABC of handover: a qualitative study to develop a new tool for handover in the emergency department.

Objectives This study identifies best practice for shift handover and introduces a new tool used to hand over clinical and operational issues at the end of a shift in the emergency department (ED). Methods Literature review, semi-structured interviews and observations of handover were used to develop a standardised process for handover. Participants were ED middle grades, consultants and senior nurses. Interviews were used to identify agreed best practice and derive a tool to classify the information into relevant sections. Results Interviews identified a variety of perceived current deficits in handover including a lack of standardised practice and structure. Participants provided examples of poor handover that were thought to have led to adverse events; these included delay in investigations and treatment for patients who were handed over with brief or inaccurate information. There was wide variation in the understanding of the meaning and purpose of shift handover, and differences were apparent according to the level of experience of the middle grades interviewed. The experts' responses were used to reach a unifying ‘best practice’ for the content of handover. This was then grouped under ABCDE headings to develop the ABC of handover tool. Conclusions A simple tool was developed to provide the basis for medical shift handover, which includes clinical and operational information necessary for efficiency and organisation of the next shift. The ABC of handover classifies shift information to be handed over under the ABCDE headings, which are easy to remember and highly relevant to emergency medicine

Electron-Hole Generation and Recombination Rates for Coulomb Scattering in Graphene

We calculate electron-hole generation and recombination rates for Coulomb scattering (Auger recombination and impact ionization) in Graphene. The conduction and valence band dispersion relation in Graphene together with energy and momentum conservation requirements restrict the phase space for Coulomb scattering so that electron-hole recombination times can be much longer than 1 ps for electron-hole densities smaller than $10^{12}$ cm$^{-2}$.Comment: 13 pages, 7 figure

Penilaian GMP dan SSOP pada Bagian Pengolahan Makanan di Katering X Surabaya dengan Metode Skoring sebagai Prasyarat Penerapan HACCP

This was descriptive observasional with cross sectional study. The subject of research to judgement were variables in this research. Variables in this research is a GMP practice (Good Manufacturing Practices) and SSOP (Standard Sanitation Operating Procedures had settled management, environment of refi neries and control facility, condition building of space food refi neries, entirety refi neries facility, water source, storeroom of food material, cook kit and food vessel, system of storage food material and foo be in use, food worker, presentation of food, and distribution of food. The result of the research showed that aspect environment of refi neries and control facility, condition building of space food refi neries, storeroom of food material, system of storage food material and foo be in use, food worker, and presentation of food including category of good. It is suggested, implemented the requirements program HACCP such as GMP and SSOP before implemented HACCP system in Katering X Surabaya so that implemented HACCP system can be function of good.Key words: GMP, SSOP, HACC