A density-functional theory investigation of cluster formation in an effective-potential model of dendrimers

We consider a system of particles interacting via a purely repulsive, soft-core potential recently introduced to model effective pair interactions between dendrimers, which is expected to lead to the formation of crystals with multiple occupancy of the lattice sites. The phase diagram is investigated by density-functional theory (DFT) without making any a priori assumption on the functional form of the density profile or on the type of crystal lattice. As the average density $\rho$ is increased, the system displays first a transition from a fluid to a bcc phase, and subsequently to hcp and fcc phases. In the inhomogeneous region, the behavior is that found in previous investigations of this class of cluster-forming potentials. Specifically, the particles arrange into clusters strongly localized at the lattice sites, and the lattice constant depends very weakly on $\rho$, leading to an occupancy number of the sites which is a nearly linear function of $\rho$. These results are compared to those predicted by the more widespread approach, in which the DFT minimization is carried out by representing the density profile by a given functional form depending on few variational parameters. We find that for the model potential studied here, the latter approach recovers most of the predictions of the unconstrained minimization.Comment: 22 pages, 7 figures. To appear in a Festschrift Issue of Transactions of The Royal Norwegian Society of Sciences and Letters (DKNVS) dedicated to Johan Hoye on his 70th birthda

Global business and human rights: the UN “norms on the responsibility of transnational corporations and other business enterprises with regard to human rights” - a requiem

On 11 June 2011, the United Nations Human Rights Council endorsed the ‘Guiding Principles for Business and Human Rights’ as a new set of guiding principles for global business designed to provide a global standard for preventing and addressing the risk of adverse impacts on human rights linked to business activity. This outcome was preceded by an earlier unsuccessful attempt by a Sub-Commission of the UN Commission on Human Rights to win approval for a set of binding corporate human rights norms, the so called “Norms on the Responsibilities of Transnational Corporations and Other Business Enterprises with Regard to Human Rights”. This article identifies and discusses the reasons why the Norms eventually failed to win approval by the then UN Commission on Human Rights. This discussion is important in order to understand the difficulties in establishing binding ‘hard law’ obligations for Transnational Corporations with regard to human rights within the wider framework of international law. It is crucial to understand possible motives as well as the underlying rationale which lead first to the adoption and then the rapid abandoning of the Norms: such a discussion will also shed light on the prospects and trends of concepts of indirect, vague voluntarism of business human rights compliance, as well as on prospects of finding alternative solutions, and finally the rationale and effect of the ‘Guiding Principles for Business and Human Rights’

Penerapan Metode Karya Wisata Untuk Meningkatkan Kemampuan Berbahasa Pada Anak TK A TK Negeri Pembina Nganjuk Tahun 2017

Penelitian ini dilatarbelakangi oleh kemampuan anak dalam berbahasa khusunya berbicara yang kurang berkembang secara maksimal.Hal ini karena kurangnya variasi metode yang digunakan guru dalam pembelajaran berbahasa.Metode karyawisata merupakan cara pembelajaran yang membawa atau mengikut sertakan anak untuk mengunjungi suatu tempat diluar kelas secara langsung guna mempelajari, mengamati, suatu obyek secara langsung sesuai dengan keadaan yang sesungguhnya. Metode ini merupakan salah satu metode yang dapat digunakan untuk mengembangkan kemampuan berbahasa. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh metode karya wisata terhadap kemampuan berbahasa pada anak TK A, TKNegeri Pembina Nganjuk Kec.Nganjuk Kab Nganjuk, tahun 2017.Penelitian ini menggunakan rancangan Penelitian Tindakan Kelas dengan menggunakan metode karyawisata untuk mengembangkan kemampuan berbahasa anak dengan mengikuti alur pokok 2 siklus :siklus pertama merupakan identifikasi masalah, dilanjutkan alternative pemecahan masalah dan rencana tindakan, pelaksanaan tindakan, kemudian diobservasidan dianalisa terakhir penulis akan melakukan refleksi, dan dilanjutkan pada siklus berikutnya.Penelitian ini dilaksanakan di TK Negeri Pembina Nganjuk Kab.Nganjuk, tahun 2018. Dari hasil analisis data dengan penerapan metode karyawisata sangat baik untuk metode pendidikan di TK Negeri Pembina Nganjuk ,Kab.Nganjuk, diperoleh hasil ketuntasan kemampuan berbahasa dari 15 anak diperoleh 13 anak telah mencapai ketuntasan kemampuan. Hal ini mencapai tingkat ketuntasan yaitu 86,67% melampaui tingkat ketuntasanyang diharapkan yaitu75%, karena pada umumnya anak usia TK gemar melihat langsung dan mendengarkan cerita yang disampaikan baik oleh guru, kakak maupun ibunya. Dan guru harus mampu mengupayakan ada nya interaksi dengan siswa, dengan demikian maka akan membiasakan anak berbicara, yang mana pada akhirnya akan membiasakan anak berani mengungkapkan fikiranya dengan bahasa

Aspects of the moduli space of instantons on CP2\mathbb{C}P^2 and its orbifolds

We study the moduli space of self-dual instantons on $\mathbb{C}P^2$. These are described by an ADHM-like construction which allows to compute the Hilbert series of the moduli space. The latter has been found to be blind to certain compact directions. In this paper we probe these, finding them to correspond to a Grassmanian, upon considering appropriate ungaugings. Moreover, the ADHM-like construction can be embedded into a $3d$ gauge theory with a known gravity dual. Using this, we realize in $AdS_4/CFT_3$ (part of) the instanton moduli space providing at the same time further evidence supporting the $AdS_4/CFT_3$ duality. Moreover, upon orbifolding, we provide the ADHM-like construction of instantons on $\mathbb{C}P^2/\mathbb{Z}_n$ as well as compute its Hilbert series. As in the unorbifolded case, these turn out to coincide with those for instantons on $\mathbb{C}^2/\mathbb{Z}_n$.Comment: 65 page

Self-consistent Ornstein-Zernike approximation for three-dimensional spins

An Ornstein-Zernike approximation for the two-body correlation function embodying thermodynamic consistency is applied to a system of classical Heisenberg spins on a three-dimensional lattice. The consistency condition determined in a previous work is supplemented by introducing a simplified expression for the mean-square fluctuations of the spin on each lattice site. The thermodynamics and the correlations obtained by this closure are then compared with approximants based on extrapolation of series expansions and with Monte Carlo simulations. The comparison reveals that many properties of the model, including the critical temperature, are very well reproduced by this simple version of the theory, but that it shows substantial quantitative error in the critical region, both above the critical temperature and with respect to its rendering of the spontaneous magnetization curve. A less simple but conceptually more satisfactory version of the SCOZA is then developed, but not solved, in which the effects of transverse correlations on the longitudinal susceptibility is included, yielding a more complete and accurate description of the spin-wave properties of the model.Comment: 32 pages, 12 figure