NAVIGATING U.S. FISHERY MANAGEMENT INTO THE 21ST CENTURY

Resource /Energy Economics and Policy,

Vortex lattices in the lowest Landau level for confined Bose-Einstein condensates

We present the results of numerical calculations of the groundstates of weakly-interacting Bose-Einstein condensates containing large numbers of vortices. Our calculations show that these groundstates appear to be close to uniform triangular vortex lattices. However, slight deviations from a uniform triangular lattice have dramatic consequences on the overall particle distribution. In particular, we demonstrate that the overall particle distribution averaged on a lengthscale large compared to the vortex lattice constant is well approximated by a Thomas-Fermi profile.Comment: 5 pages, 4 figure

Navigating Nursing: A Literature Review of Understanding and Addressing Challenges in the Nursing Profession

The purpose of this project is to conduct a comprehensive literature review from a global nursing perspective, examining the challenges faced by nurses and potential strategies to address them. Specifically, this study investigates the concept of resilience in nurses to inform future interventions aimed at building and maintaining a strong nursing workforce. The study analyzed 34 scholarly articles from various databases to identify the challenges and factors affecting nurse retention and to explore effective strategies for reducing nurse turnover. The results suggest that burnout, compassion fatigue, moral distress, incivility in the workplace, workload, and job stress are the key reasons for nurse turnover. Manager support, self-care strategies, nurse unions, supervisor support, and professional development are identified as effective strategies for enhancing nurse retention. This study provides significant implications for policymakers, healthcare administrators, and nurse leaders to develop targeted interventions aimed at improving the well-being and job satisfaction of nurses, ultimately enhancing the quality of care provided to patients. By investing in the resilience of nurses, this study seeks to make a positive impact on the nursing workforce and promote the future of healthcare

Kelayakan Teknologi Desalinasi sebagai Alternatif Penyediaan Air Minum Kota Surabaya (Studi Kasus: 50 Liter Per Detik)

Saat ini, PDAM Surabaya masih kesulitan mencari air baku. Selain kurangnya debit untuk air baku, kualitas air baku di Surabaya yang minim membuat biaya produksi semakin meningkat. Di sisi lain, masih terdapat air laut sebagai sumber air baku yang secara kuantitas tidak terbatas namun memiliki kadar garam yang sangat tinggi. Dikaji 3 alternatif teknologi pengolahan yang umum digunakan secara studi literatur, yaitu: teknologi distilasi dengan Multi Stage Flash Distilation (MSF), teknologi membran dengan Reverse Osmosis (RO) dan teknologi pertukaran ion dengan (Electrodeionization). Unit pengolahan yang terpilih adalah Reverse Osmosis dengan keunggulan terletak pada kecepatannya dalam memproduksi air serta adanya peluang pemanfaatan reject water yang dapat meringankan biaya investasi yang sangat tinggi. Unit pengolahan terdiri dari vertical beach-well intake, koagulasi-flokulasi, sedimentasi, pressure sand filter, karbon aktif, RO dan terakhir klorinasi. Pengolahan ini tidak menggunakan bahan kimia, sehingga reject water dapat dimanfaatkan menjadi garam murni dan nigari yang aman untuk dikonsumsi. Hasil analisa finansial dari sistem pengolahan ini dapat dikatakan layak karena memiliki nilai NPV bernilai positif sebesar Rp11.953.760.829 dengan IRR sebesar 28,81% yang lebih besar dari MARR Bank BNI yaitu 12,5% dengan periode pengembalian setelah 6 tahun proyek berjalan berdasarkan metode payback perio

Classification of zero-energy resonances by dissociation of Feshbach molecules

We study the dissociation of Feshbach molecules by a magnetic field sweep across a zero-energy resonance. In the limit of an instantaneous magnetic field change, the distribution of atomic kinetic energy can have a peak indicating dominance of the molecular closed-channel spin configuration over the entrance channel. The extent of this dominance influences physical properties such as stability with respect to collisions, and so the readily measurable presence or absence of the corresponding peak provides a practical method of classifying zero-energy resonances. Currently achievable ramp speeds, e.g. those demonstrated by Duerr et al. [Phys. Rev. A 70, 031601 (2005)], are fast enough to provide magnetic field changes that may be interpreted as instantaneous. We study the transition from sudden magnetic field changes to asymptotically wide, linear ramps. In the latter limit, the predicted form of the atomic kinetic energy distribution is independent of the specific implementation of the two-body physics, provided that the near-resonant scattering properties are properly accounted for.Comment: 10 pages, 5 eps figure

Impact-induced acceleration by obstacles

We explore a surprising phenomenon in which an obstruction accelerates, rather than decelerates, a moving flexible object. It has been claimed that the right kind of discrete chain falling onto a table falls \emph{faster} than a free-falling body. We confirm and quantify this effect, reveal its complicated dependence on angle of incidence, and identify multiple operative mechanisms. Prior theories for direct impact onto flat surfaces, which involve a single constitutive parameter, match our data well if we account for a characteristic delay length that must impinge before the onset of excess acceleration. Our measurements provide a robust determination of this parameter. This supports the possibility of modeling such discrete structures as continuous bodies with a complicated constitutive law of impact that includes angle of incidence as an input.Comment: small changes and corrections, added reference