Some comments on N=2N=2 supersymmetric Yang-Mills

We comment on some aspects of the semiclassical BPS saturated states close to the curve $Im a_{D}/a =0$Comment: 8 pages, TEX, Harvma

Exact Ground State Wave Functions for N Anyons in a Magnetic Field on a Torus

The complete set of ground state wave functions for N anyons in an external magnetic field on the torus is found. The cases when the filling factor is less than or equal to one are considered. The single valued description of anyons is employed through out by coupling bosons to a Chern-Simons field. At the end, the Chern-Simons interaction is removed by a singular gauge transformation as a result of which the wave functions become multi-component in agreement with other studies.Comment: 10 pages, Latex document, USITP-93-0

“Evolved Materials and Innovative Design for High Performance, Durable and Reliable SOFC Cell and Stack” Presentation and Status of the European Project EVOLVE

Beyond the state of the art, EVOLVE aims at the development of a new cell architecture for SOFC, combining benefits of existing Anode Supported (high power density, lifetime) and Metal Supported cell (redox stability) architectures, while limiting the issue of sulphur poisoning by using enhanced perovskite anode materials. The core component is based on a composite anode substrate made of porous Alumina forming alloy combined with an electron conducting oxide ceramic, without having Nickel as structural component. A first Anode/Electrolyte assembly based on a NiCrAl foam and La0,1Sr0,9TiO3-α has been produced by means of Vacuum Plasma Spraying, showing the feasibility of this cell concept. With a requirement of a low temperature process, the manufacturing of the electrolyte layer remains the key challenge. Work is under progress for the manufacturing and testing of the first full prototype

Calibrations, Torsion Classes and Wrapped M-Branes

The present work has two goals. The first is to complete the classification of geometries in terms of torsion classes of M-branes wrapping cycles of a Calabi-Yau. The second goal is to give insight into the physical meaning of the torsion class constraints. We accomplish both tasks by defining new energy minimizing calibrations in M-brane backgrounds. When fluxes are turned on, it is these calibrations that are relevant, rather than those which had previously been defined in the context of purely geometric backgrounds

Optimalisasi Energi Mekanik Pengepresan Buah Markisa Dan Formula Membentuk Sifat Effervescen Tablet Buah Markisa

Tujuan penelitian ini adalah menentukan pengaruh energi pengepresan dan formula terhadap sifat tablet effervescen buah markisa. Penelitian dilakukan dengan memvariasi tekanan pengepresan dan formula bahan. Formulasi bahan dilakukan dengan memvariasi konsentrasi asam sitrat dan natrium bikarbonat dengan rasio berat 1:3, 1:2, 1:1, 3:1, 2:1 dan 2:3, sedangkan variasi energi mekanik pengepresan adalah 1000, 2000, 3000, 4000 dan 5000 N. Sifat tablet effervescen yang dibahas dalam evaluasi adalah kekerasan dan kelarutan. Hasil penelitian menunjukkan bahwa energi pengepresan berpengaruh secara signifikan terhadap tekstur dan kelarutan tablet effervescen buah markisa. Variasi formula tidak berpengaruh secara signifikan terhadap tekstur dan kelarutan tablet effervescen buah markisa. Sifat tablet yang baik adalah yang dibuat pada energi pengepresan 3000 N dengan rasio konsentrasi asam sitrat dan natrium bikarbonat 1:2

Menuju Kebijakan Pengelolaan Teluk Palu Yang Harmonis

Tulisan ini mencoba menggagas kebijakan pengelolaan teluk palu yang harmonis, di tengah tingginya potensi sumber daya alam di teluk Palu tentu saja banyak pihak kepentingan yang akan mengambil keuntungan di dalamnya. Nelayan tradisional yang secara turun temurun mengadu dan menyandarkan kehidupannya di teluk Palu, pengusaha, dan pemerintah adalah tiga aktor penting dalam pemanfaatan dan pengelolaan teluk Palu. Namun pada Kenyataannya terjadi GAB antara harapan dalam pengelolaan dan Kenyataan sesungguhnya di teluk Palu. Kerusakan ekologi dan daya dukung teluk palu akibat eksploitasi yang berlebihan, sampah dan limbah yang tidak terkontrol, berbanding lurus dengan merosotnya daya dukung dan penghasilan nelayan tradisional teluk Palu. Dalam pembangunan yang harmonis tentunya tidaklah mempertentangkan 3 aktor utama dalam pemanfaatan teluk Palu, tetapi bagaimana mensinergikan ke tiga aktor tersebut kedalam kue pembangunan yang merata demi terwujutnya cita-cita pengelolaan teluk Palu yang harmonis

G2G_2 holonomy metrics and wrapped D6-branes

We determine torsion class constraints for the supergravity background produced by D6-branes wrapping special Lagrangian cycles in a Calabi-Yau 3-fold. We employ a recently introduced method which involves probing the putative background by all possible supersymmetric brane configurations. We then lift this background to 11-dimensions to a product of 4-d Minkowski space and a 7-fold of G2-holonomy. The latter is a particular U(1) bundle over an almost complex manifold of SU(3) structure with specific torsion class constraints. We construct the closed 3- and 4-forms which calibrate the 3- and 4-cycles in the G2-holonomy manifold.Comment: 21 pages, references adde

The Geometry of M-Branes Wrapping Special Lagrangian Cycles

We characterize the geometry produced by M5-branes wrapping a Special Lagrangian 3-cycle in a Calabi-Yau 3-fold. The presence of the brane replaces the the Calabi-Yau by a real manifold with an almost complex structure. We show that, in this classification, a distinguished (1,1) form as well as a globally defined (3,0) form play an important role. The requirements of supersymmetry preservation impose constraints on these structures which can be used to classify the background.Comment: 17 pages, correct versio

The geometry of wrapped M5-branes in Calabi-Yau 2-folds

We study the geometry of M5-branes wrapping a 2-cycle which is Special Lagrangian with respect to a specific complex structure in a Calabi-Yau two-fold. Using methods recently applied to the three-fold case, we are again able find a characterization of the geometry, in terms of a non-integrable almost complex structure and a (2,0) form. This time, however, due to the hyper-K{\"a}hler nature of the underlying 2-fold we also have the freedom of choosing a different almost complex structure with respect to which the wrapped 2-cycle is holomorphic. We show that this latter almost complex structure is integrable. We then relate our geometry to previously found geometries of M5-branes wrapping holomophic cycles and go further to prove some previously unknown results for M5-branes on holomorphic cycles