The imposition of Cauchy data to the Teukolsky equation III: The rotating case

We solve the problem of expressing the Weyl scalars $\psi$ that describe gravitational perturbations of a Kerr black hole in terms of Cauchy data. To do so we use geometrical identities (like the Gauss-Codazzi relations) as well as Einstein equations. We are able to explicitly express $\psi$ and $\partial _t\psi$ as functions only of the extrinsic curvature and the three-metric (and geometrical objects built out of it) of a generic spacelike slice of the spacetime. These results provide the link between initial data and $\psi$ to be evolved by the Teukolsky equation, and can be used to compute the gravitational radiation generated by two orbiting black holes in the close limit approximation. They can also be used to extract waveforms from spacetimes completely generated by numerical methods.Comment: 5 pages, REVTEX, no figure

Optimalisasi Mibew Messenger Guna Meningkatkan Pelayanan Iduhelp! Online Pada Perguruan Tinggi

Informasi yang cepat dan akurat sangat diperlukan dalam zaman yang pesat ini. Di dalam suatu perkuliahan pun sangatlah membutuhkan pelayanan yang sama yaitu informasi yang sangat baik dan sangat optimal. Pelayanan yang diberikan merupakan pelayanan yang sangat baik dan customer pun dapat memiliki pelayanan yang sangat bermanfaat. Media pelayanan yang digunakan biasanya secara Online dan Offline. Untuk saat ini media pelayanan yang diberikan dapat dilakukan secara online yaitu menggunakan media internet/browsing langsung antara customer dan operator iDuHelp! secara Langsung, dengan memberikan pelayanan yang terbaik untuk customer dan operator pun memberikan menjawab semua keluhan dan pertanyaan yang di ajukan oleh customer hingga customer  mendapatkan pelayanan dan informasi seputar Perguruan Tinggi Raharja. Pada penelitian menggunakan mind mapping. iDuHelp! Online adalah pelayanan informasi kampus yang sangat cepat untuk para mahasiswa mendapatkan informasi seputar perkuliahan yang ada di Perguruan Tinggi Raharja. Sistem iDuHelp! adalah sistem untuk melayani Pribadi Raharja atau mahasiswa yang kesulitan dalam mencari informasi mengenai seputar Green Campus. Didalam sistem iDuHelp! Terdapat banyak sekali menu2 seperti  Home, Visitors, Chat History, Statistics, dan untuk administration terdapat menu2 seperti Canned Messages, Button code, Operators, Groups, Settings, Localize, Updates, Notifications, Profile dan Exit.  Dengan demikian mahasiswa terhindar dari segala kesulitan. Mahasiswa juga dapat melakukan layanan iDuHelp! Offline,  yang dilakukan dengan cara meninggalkan pesan  melalui email Rinfo dengan meninggalkan pesan kepada email iDuHelp!. Penyediaaan iDuHelp! Offline  diharapkan bisa memberikan kemudahan yang sama dengan iDuHelp! Online bagi setiap mahasiswa Perguruan Tinggi Raharja.   Kata kunci : Optimalisasi, Pelayanan, iDuHelp! Online

Treatment of systemic sclerosis associated ILD: Lessons from clinical trials

Systemic sclerosis–associated interstitial lung disease remains a leading cause of mortality. Despite decades of clinical trials, the treatment effects of disease modifying anti-rheumatic drugs continue to be modest and there remains a great need for therapies that attenuate and hopefully ameliorate parenchymal lung disease. In this review, we highlight the key clinical trials that have shaped the management strategies employed by the authors, providing their strength of recommendation based on level of evidence. We also review lessons learned in more recent years, suggesting a benefit in targeting patients with subclinical interstitial lung disease with high risk for progression early in the disease course, as well as the benefit seen in a large clinical trial leading to the first Food and Drug Administration–approved treatment for systemic sclerosis–associated interstitial lung disease. These lessons come in a context of heterogeneity of patient populations and response to therapy, as well as the inherent constraints of time-limited studies to detect meaningful outcomes for patients

Entanglement discontinuity

We identify a class of two-mode squeezed states which are parametrized by an angular variable ${0\le\theta<2\pi}$ and a squeezing parameter $r$. We show that, for a large squeezing value, these states are either (almost) maximally entangled or product states depending on the value of $\theta$. This peculiar behavior of entanglement is unique for infinite dimensional Hilbert space and has consequences for the entangling power of unitary operators in such systems. Finally, we show that, at the limit ${r\to\infty}$ these states demonstrate a discontinuity attribute of entanglement.Comment: 5 pages, 3 figure

Structural growth in iron oxide clusters: Rings, towers, and hollow drums

It is shown that the transition from an elementary FeO molecule to the bulk rock-salt FeO proceeds via hollow rings, towers, and drums. Our first-principles electronic structure calculations carried out within a gradient-corrected density functional framework show that small FenOn (n=2,3,4,5) clusters form single, highly stable rings. Starting at Fe6O6, these elementary rings begin to assemble into nano columnar structures to form stable Fe6O6, Fe7O7, Fe8O8, Fe9O9, Fe10O10, and Fe12O12 towers. The rings and the empty towers can be further stabilized by capping O atoms at the ends, leading to FenOn+1 and FenOn+2 sequences. The theoretical results provide insight into the progression of mass intensities in the experimental mass spectra and account for the observed peaks in the negative ion photodetachment spectra of iron oxide clusters

Classical Stern-Gerlach profiles of Mn5 and Mn6 clusters

Mn5 and Mn6 clusters have recently been found to exhibit Stern-Gerlach profiles marked by a central peak that broadens with the increasing field gradient. The profiles neither exhibit a reminiscence of space quantization as observed through a splitting of beams for the case of free atoms, nor a net deflection characteristic of superparamagnetic relaxations observed in other transition metal clusters. It is proposed that this new behavior results from a weak coupling of localized atomic moments. ab initio electronic structure studies are carried out to show that a Mn5cluster has isomers with spin magnetic moments of 3μB, 13μB, and 23μBwhile a Mn6 cluster has isomers with moments of 2μB, 8μB, 16μB, and 26μB, respectively. The isomers can be obtained by sequential turning of the local atomic moments starting from the ferromagnetic state and can be seen in the negative ion photoelectron spectra of the anions. The weak coupling of the atomic moments, however, leads to unconventional spin dynamics that result in classical broadening of the Stern-Gerlach profiles and lower apparent magnetic moments. The theoretical results illustrate how a combination of the negative ion photodetachment spectroscopy and Stern-Gerlach profiles can provide information on the net spin moment, interatomic spin coupling, and spin dynamics

Radiofrequency-assisted liver resection versus clamp-crush liver resection: protocol for an updated meta-analysis and systematic review

Background: Malignancy of the liver has historically meant a poor prognosis and remains the second most common cause of cancer-related deaths globally. Traditionally, hepatectomy has utilized the clamp-crush technique; however, this is associated with high incidence of postoperative complications. Many novel techniques have been developed—radiofrequency ablation and transarterial chemoembolization; however, these are not applicable to numerous cases. Clamp-crush liver resection (CCLR) remains the gold standard. Radiofrequency-assisted liver resection (RFLR) is a technique that aims to reduce mortality through bloodless liver resection. A systematic review was previously performed on RFLR but the results neither recommended nor refuted the use of RFLR owing to the lack of sufficient evidence from well-designed randomized controlled trials (RCTs) at the time. Objective: The aim of the study is the meta-analysis and systematic review of recent studies comparing RFLR against CCLR. Methods: Articles comparing RFLR and CCLR that were published from 2014 until 2019 will be reviewed and relevant data will be extracted and statistically analyzed through Review Manager 5 (by the Cochrane Collaboration) together with the results of the previous meta-analysis. Results: Data collection is currently underway, with papers being screened. We hope to publish the results by the end of 2019. Conclusions: Given the high mortality rates currently associated with liver resection, it is imperative that novel surgical techniques are undertaken and investigated so we can improve best practice guidance and outcomes. International Registered Report Identifier (IRRID): DERR1-10.2196/1343

Exploring Students' Experiences in Occupational Therapy Education:A Phenomenological Study of Professional Identity Development

The existing literature on professional identity enactment and development, subscribes to students’ socializing in a learning environment, where they regularly encounter practicing professionals throughout their education period. However, in most countries with less resourced occupational therapists like Ghana, education in occupational therapy is fraught with inadequate number of same professionals to mentor undergraduate occupational therapy students. The students are thus faced with serious dilemma regarding their professional identity which tends to elicit a bleak perception of their chosen career. The present study was therefore envisaged to interpret and analyse the students’ lived experiences, with the view to capture the process of constructing and developing professional identity. The study focused on purposively sampled group of nine undergraduate occupational therapy students during their practice placement education, and their learning styles on didactic lectures. A hermeneutic phenomenological approach was adopted for the study. The students were followed up throughout their four-year study program for data collection, using one-to-one semi-structured interviews each year. With reference to the threshold concepts, transcribed interview data were analyzed using interpretative phenomenological procedures. The study established a transformational development of professional identity from the novice stage into graduate professionals, amidst complex interaction of co-constructed themes which included: personal knowing, professional knowing and experiential knowing

Hydrogen adsorption and magnetic behavior of Fen and Con clusters: Controlling the magnetic moment and anisotropy one atom at a time

Theoretical studies to investigate the effect of H absorption on the magnetic moment of small Fen and Con clusters have been carried out using gradient corrected density-functional approach. Our studies on clusters containing up to four transition metal and 2 H atoms show that the successive addition of H atoms can lead to monotonic or oscillatory change from the free cluster magnetic moment. A detailed analysis of the density of electronic states shows that the variations in the magnetic moment can be related to the location of the lowest unoccupied molecular orbital in the parent cluster. It is shown that the addition of hydrogen can substantially change the magnetic anisotropy. In particular Co3H2is shown to exhibit magnetic anisotropy that is higher than any of the known anisotropies in the molecular nanomagnets