An efficient coding system for deep space probes with specific application to Pioneer missions

One-half rate convolutional encoding with sequential decoding for deep space probe telemetry links with application to Pioneer mission

Freund-Rubin Revisited

We utilise the duality between M theory and Type IIA string theory to show the existence of Freund-Rubin compactifications of M theory on 7-manifolds with singularities supporting chiral fermions. This leads to a concrete way to study phenomenologically interesting quantum gravity vacua using a holographically dual three dimensional field theory.Comment: reference adde

Latest results from the PHOBOS experiment

Over the past years PHOBOS has continued to analyze the large datasets obtained from the first five runs of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The two main analysis streams have been pursued. The first one aims to obtain a broad and systematic survey of global properties of particle production in heavy ion collisions. The second class includes the study of fluctuations and correlations in particle production. Both type of studies have been performed for a variety of the collision systems, covering a wide range in collision energy and centrality. The uniquely large angular coverage of the PHOBOS detector and its ability to measure charged particles down to very low transverse momentum is exploited. The latest physics results from PHOBOS, as presented at Quark Matter 2008 Conference, are contained in this report.Comment: 9 pages, 9 figures, presented at the 20th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, "Quark Matter 2008", Jaipur, India, Feb.4-10, 200

On the Singularities of the Magnon S-matrix

We investigate the analytic structure of the magnon S-matrix in the spin-chain description of planar ${\cal N}=4$ SUSY Yang-Mills/$AdS_{5}\times S^{5}$ strings. Semiclassical analysis suggests that the exact S-matrix must have a large family of poles near the real axis in momentum space. In this article we show that these are double poles corresponding to the exchange of pairs of BPS magnons. Their locations in the complex plane are uniquely fixed by the known dispersion relation for the BPS particles. The locations precisely agree with the recent conjecture for the $S$ matrix by Beisert, Hernandez, Lopez, Eden and Staudacher (hep-th/0609044 and hep-th/0610251). These poles do not signal the presence of new bound states. In fact, a certain non-BPS localized classical solution, which was thought to give rise to new bound states, can actually decay into a pair of BPS magnons.Comment: 40 pages, 14 figures; typos corrected, references adde

Fission Hindrance in hot 216Th: Evaporation Residue Measurements

The fusion evaporation-residue cross section for 32S+184W has been measured at beam energies of E_beam = 165, 174, 185, 196, 205, 215, 225, 236, 246,and 257 MeV using the ATLAS Fragment Mass Analyzer. The data are compared with Statistical Model calculations and it is found that a nuclear dissipation strength, which increases with excitation energy, is required to reproduce the excitation function. A comparison with previously published data show that the dissipation strength depends strongly on the shell structure of the nuclear system.Comment: 15 pages 9 figure

Despite Brexit and Trump, London and New York real estate will remain a safe deposit box for transnational wealth elites

The flow of money from the super-rich or wealth elites into real estate in global cities like London and New York have left analysts wondering whether this is a temporary surge or a deeper transformation of real estate markets. The rebellion against globalization, illustrated by Brexit and the election of Donald Trump, makes this an even more pressing issue. Rodrigo Fernandez, Annelore Hofman and Manuel B. Aalbers argue that to understand the geography of wealth elites, we need to look at the underlying mechanisms of global inequality, such offshore finance and the role of global cities as real estate investment locations

Open membranes, ribbons and deformed Schild strings

We analyze open membranes immersed in a magnetic three-form field-strength $C$. While cylindrical membranes in the absence of $C$ behave like tensionless strings, when the $C$ flux is present the strings polarize into thin membrane ribbons, locally orthogonal to the momentum density, thus providing the strings with an effective tension. The effective dynamics of the ribbons can be described by a simple deformation of the Schild action for null strings. Interactions become non-local due to the polarization, and lead to a deformation of the string field theory, whereby string vertices receive a phase factor proportional to the volume swept out by the ribbons. In a particular limit, this reduces to the non-commutative loop space found previously.Comment: revte

On Central Charges and Hamiltonians for 0-brane dynamics

We consider general properties of central charges of zero branes and associated duality invariants, in view of their double role, on the bulk and on the world volume (quantum-mechanical) theory. A detailed study of the BPS condition for the mass spectrum arising from toroidal compactifications is given for 1/2, 1/4 and 1/8 BPS states in any dimensions. As a byproduct, we retreive the U-duality invariant conditions on the charge (zero mode) spectrum and the orbit classification of BPS states preserving different fractions of supersymmetry. The BPS condition for 0-branes in theories with 16 supersymmetries in any dimension is also discussed.Comment: 23 pages, latex fil

Multi-Fuel Burner Systems for Industrial Applications

Multi-fuel firing systems are used in several industrial processes such as in power stations, drying mills and metallurgical plants as well as in rotary kiln systems, industrial boilers, cogeneration plants and various thermal process factories. Such systems should being not only able to utilize different fuel types, but also to respond flexible due to changing in fuel compositions and qualities. In particular the ignition, stability and pollutant problems must be taken into account. That means that these systems should fulfill the operational parameters and ecological target according to German Technical Instructions on Air Quality Control TA Luft 2002. The Operation of these so called multi fuels systems is determined on the one hand by the conditions of the start-up procedure (e. g. drying of the refractory material, creation of the necessary operating environment) and on the other hand by the process-related requirements, fluctuating commodity prices, unstable fuel supplies and the use of internally resulting production scrap. In this paper two multi-fuel burner systems are selected from the extensive Brinkman’s production program to be shown in details. These are combined combustion systems for «pulverized coal-gas» and «pulverized coal-oil», respectively.Многотопливные горелочные системы используются в различных промышленных процессах, на ТЭС и в металлургии, включая сухое измельчение сырых материалов, во вращающихся печах, промышленных котлах, установках когенерации и специальных термических технологиях. Соответствующие системы должны быть пригодны для использования различных видов топлива и гибко реагировать на изменения его состава и качества, в частности, необходимо учитывать устойчивость воспламенения топливной смеси и сопутствующее загрязнение окружающей среды. Такие системы должны обеспечивать эксплуатационные параметры и экологические нормативы в соответствии с германскими техническими стандартами качества воздуха (TA Luft 2002 г.). Качество работы этих многотопливных систем определяется, с одной стороны, пусковыми условиями (например, сушка огнеупоров, создание требуемой рабочей среды), с другой стороны, эксплуатационными требованиями, колебаниями цен на сырьевые продукты и готовые товары, а также условиями, учитывающими специфику технологии, нестабильное снабжение топливом. Принимается во внимание также внутренняя утилизация отходов в пределах производства. В статье рассмотрены две многотопливные горелочные системы, выбранные из обширной производственной номенклатуры ООО «Бринкман». Соответственно представлены системы комбинированного сжигания пылеугольного и газового топлива, а также пылеугольного топлива с жидким топливом.Багатопаливні пальникові системи використовуються у різних промислових процесах, на ТЕС та у металургії включно з сухим подрібненням вологих матеріалів у обертових пічах, промислових котлах, установках когенерації та спеціальних термічних технологіях. Відповідні системи мають бути придатними для використання різних видів палива та гнучко реагувати на зміни його складу та якості, зокрема необхідно враховувати стійкість займання паливної суміші та супутнє забруднення довкілля. Такі системи мають забезпечувати експлуатаційні параметри та екологічні нормативи у відповідності до германських технічних стандартів щодо якості повітря (TA Luft 2002 р.). Якість роботи цих багатопаливних систем визначається пусковими умовами (наприклад, сушіння вогнетрив ів, створення потрібного робочого середовища) та, експлуатаційними вимогами, коливаннями цін на сировинні продукти та готові товари, а також умовами, що враховують специфіку технології, нестабільне постачання палива. Приймається до уваги також внутрішня утилізація відходів у межах виробництва. Розглянуто дві багатопаливні пальникові системи, вибрані з великої виробничої номенклатури ТОВ «Брінкман». Представлено системи комбінованого спалювання пиловугільного та газового палива, а також пиловугільного палива з рідким паливом