Affine actions on non-archimedean trees

We initiate the study of affine actions of groups on $\Lambda$-trees for a general ordered abelian group $\Lambda$; these are actions by dilations rather than isometries. This gives a common generalisation of isometric action on a $\Lambda$-tree, and affine action on an $\R$-tree as studied by I. Liousse. The duality between based length functions and actions on $\Lambda$-trees is generalised to this setting. We are led to consider a new class of groups: those that admit a free affine action on a $\Lambda$-tree for some $\Lambda$. Examples of such groups are presented, including soluble Baumslag-Solitar groups and the discrete Heisenberg group.Comment: 27 pages. Section 1.4 expanded, typos corrected from previous versio

Demo of Gaze Controlled Flying

Development of a control paradigm for unmanned aerial vehicles (UAV) is a new challenge to HCI. The demo explores how to use gaze as input for locomotion in 3D. A low-cost drone will be controlled by tracking user’s point of regard (gaze) on a live video stream from the UAV

Surfactant-free purification of membrane protein complexes from bacteria: application to the staphylococcal penicillin-binding protein complex PBP2/PBP2a

Surfactant-mediated removal of proteins from biomembranes invariably results in partial or complete loss of function and disassembly of multi-protein complexes. We determined the capacity of styrene-co-maleic acid (SMA) co-polymer to remove components of the cell division machinery from the membrane of drug-resistant staphylococcal cells. SMA-lipid nanoparticles solubilized FtsZ-PBP2-PBP2a complexes from intact cells, demonstrating the close physical proximity of these proteins within the lipid bilayer. Exposure of bacteria to (-)-epicatechin gallate, a polyphenolic agent that abolishes β-lactam resistance in staphylococci, disrupted the association between PBP2 and PBP2a. Thus, SMA purification provides a means to remove native integral membrane protein assemblages with minimal physical disruption and shows promise as a tool for the interrogation of molecular aspects of bacterial membrane protein structure and function

Cross-Over between universality classes in a magnetically disordered metallic wire

In this article we present numerical results of conduction in a disordered quasi-1D wire in the possible presence of magnetic impurities. Our analysis leads us to the study of universal properties in different conduction regimes such as the localized and metallic ones. In particular, we analyse the cross-over between universality classes occurring when the strength of magnetic disorder is increased. For this purpose, we use a numerical Landauer approach, and derive the scattering matrix of the wire from electron's Green's function.Comment: Final version, accepted for publication in New Journ. of Physics, 27 pages, 28 figures. Replaces the earlier shorter preprint arXiv:0910.427

Conformal dimension and random groups

We give a lower and an upper bound for the conformal dimension of the boundaries of certain small cancellation groups. We apply these bounds to the few relator and density models for random groups. This gives generic bounds of the following form, where $l$ is the relator length, going to infinity. (a) 1 + 1/C < \Cdim(\bdry G) < C l / \log(l), for the few relator model, and (b) 1 + l / (C\log(l)) < \Cdim(\bdry G) < C l, for the density model, at densities $d < 1/16$. In particular, for the density model at densities $d < 1/16$, as the relator length $l$ goes to infinity, the random groups will pass through infinitely many different quasi-isometry classes.Comment: 32 pages, 4 figures. v2: Final version. Main result improved to density < 1/16. Many minor improvements. To appear in GAF

TANGGAPAN MASYARAKAT PANTAI LICIN SEBAGAI DAERAH TUJUAN WISATA DI DESA LEBAKHARJO KECAMATAN AMPELGADING, MALANG

Abstrak: Sektor pariwisata Provinsi Jawa Timur merupakan salah satu andalan untuk meningkatkan perekonomian. Provinsi Jawa Timur mulai mencoba memperkenalkan progam Visit East Java untuk memperkenalkan objek wisata yang berada di Jawa Timur. Kabupaten Malang merupakan salah satu kabupaten yang mengikuti program Visit East. Pantai Licin termasuk dalam kategori pantai yang akan dikembangkan oleh pemerintah kabupaten. Penelitian ini bermanfaat untuk (1) informasi untuk mendukung perencanaan pengembangan objek wisata Pantai Licin (2) informasi tentang adanya potensi pantai yang belum dikembangkan dan diharapkan adanya partisipasi masyarakat dalam mendukung pengembangan objek wisata Pantai Licin. Jenis penelitian ini adalah survei. Subyek penelitian ini adalah masyarakat Pantai Licin. Data tanggapan digunakan untuk mengetahui kesiapan masyarakat apabila Pantai Licin dijadikan sebagai objek wisata. Populasi penelitian sebanyak 30 orang. Analisis data menggunakan statistik deskriptif, yaitu scoring dan tabulasi. Berdasarkan hasil analisis, diperoleh kondisi non-fisik yang meliputi tanggapan masyarakat tergolong setuju apabila Pantai Licin dijadikan sebagai objek wisata.Kata Kunci: Tanggapan, Pantai Licin

Tanggapan Masyarakat Pantai Licin sebagai Daerah Tujuan Wisata di Desa Lebakharjo Kecamatan Ampelgading, Malang

Abstrak: Sektor pariwisata Provinsi Jawa Timur merupakan salah satu andalan untuk meningkatkan perekonomian. Provinsi Jawa Timur mulai mencoba memperkenalkan progam Visit East Java untuk memperkenalkan objek wisata yang berada di Jawa Timur. Kabupaten Malang merupakan salah satu kabupaten yang mengikuti program Visit East. Pantai Licin termasuk dalam kategori pantai yang akan dikembangkan oleh pemerintah kabupaten. Penelitian ini bermanfaat untuk (1) informasi untuk mendukung perencanaan pengembangan objek wisata Pantai Licin (2) informasi tentang adanya potensi pantai yang belum dikembangkan dan diharapkan adanya partisipasi masyarakat dalam mendukung pengembangan objek wisata Pantai Licin. Jenis penelitian ini adalah survei. Subyek penelitian ini adalah masyarakat Pantai Licin. Data tanggapan digunakan untuk mengetahui kesiapan masyarakat apabila Pantai Licin dijadikan sebagai objek wisata. Populasi penelitian sebanyak 30 orang. Analisis data menggunakan statistik deskriptif, yaitu scoring dan tabulasi. Berdasarkan hasil analisis, diperoleh kondisi non-fisik yang meliputi tanggapan masyarakat tergolong setuju apabila Pantai Licin dijadikan sebagai objek wisata.   DOI: http://dx.doi.org/10.17977/um017v21i22016p00