Shuttle active thermal control system development testing. Volume 2: Modular radiator system tests

Tests were designed to investigate the validity of the "modular" approach to space radiator system design for space shuttle and future applications by gathering performance data on various systems comprised of different numbers of identical panels, subject to nominal and extreme heat loads and environments. Both one-sided and two-sided radiation was tested, and engineering data was gathered on simulated low a/e coatings and system response to changes in outlet temperature control point. The results of the testing showed system stability throughout nominal orbital transients, unrealistically skewed environments, freeze-thaw transients, and rapid changes in outlet temperature control point. Various alternative panel plumbing arrangements were tested with no significant changes in performance being observed. With the MRS panels arranged to represent the shuttle baseline system, a maximum heat rejection of 76,600 Btu/hr was obtained in segmented tests under the expected worst case design environments. Testing of an alternate smaller two-sided radiation configuration yielded a maximum heat rejection of 52,931 Btu/hr under the maximum design environments

Toward an Understanding of the Tidal Fluid Mechanics Associated with the Genesis Flood

Tidal fluid mechanics associated with a global ocean are investigated using numerical analysis and computer simulation. Tidal waves, with their shallow water wave characteristics, are shown to be perfect candidates for the role of sediment transport and deposition associated with the buildup of thick sequences of sedimentary strata. The global ocean in the tidal context is shown to be near resonance which, if present, would augment the load-carrying ability of the tidal waves. Pertinent variables of fluid friction, ocean depth, and bottom relief are studied to ascertain their role in the tidal action in a global ocean

Inverse Anticipating Synchronization

We report a new type of chaos synchronization:inverse anticipating synchronization, where a time delay chaotic system can drive another system in such a way that the driven system anticipates the driver by synchronizing with its inverse future state. We extend the concept of inverse anticipating chaos synchronization to cascaded systems. We propose means for the experimental observation of inverse anticipating chaos synchronization in external cavity lasers.Comment: LaTex 6 pages, resubmitted to PR

Parameter Mismatches and Perfect Anticipating Synchronization in bi-directionally coupled external cavity laser diodes

We study perfect chaos synchronization between two bi-directionally coupled external cavity semiconductor lasers and demonstrate for the first time that mismatches in laser photon decay rates can explain the experimentally observed anticipating time in synchronization.Comment: Latex 4 page

A bargaining and property rights perspective on the Belt and Road Initiative: Cases from the Italian port system

Infrastructural assets are vital for a country’s economic and social development. Governments typically provide the regulation and administration of these assets, while multinational enterprises (MNEs) develop, construct, finance, and operate them. The Belt and Road Initiative (BRI) promises infrastructure projects that deliver economic and social benefit for both the host country and the MNE, however, the foreign market entry activities of Chinese MNEs in infrastructure projects might not always be successful. By bridging the bargaining power literature with the economics of property rights perspective, we examine how and why host-country actors at different governance levels influence foreign direct investment. Using a comparative case study approach, we interrogate four attempts by Chinese firms to negotiate access to Italian ports. In particular, we show that for a BRI port investment to take place, there has to be an alignment between the various actors of the property rights nexus regarding the allocation of rights. Chinese investors need to understand the bargaining position and property rights of actors across multiple levels, across space, and be mindful of changes over time when negotiating an infrastructure investment. Host-country governments need to have a clear port infrastructure strategy to avoid wasting resources in lengthy negotiations and useless infrastructure

Layer Features of the Lattice Gas Model for Self-Organized Criticality

A layer-by-layer description of the asymmetric lattice gas model for 1/f-noise suggested by Jensen [Phys. Rev. Lett. 64, 3103 (1990)] is presented. The power spectra of the lattice layers in the direction perpendicular to the particle flux is studied in order to understand how the white noise at the input boundary evolves, on the average, into 1/f-noise for the system. The effects of high boundary drive and uniform driving force on the power spectrum of the total number of diffusing particles are considered. In the case of nearest-neighbor particle interactions, high statistics simulation results show that the power spectra of single lattice layers are characterized by different $\beta_x$ exponents such that $\beta_x \to 1.9$ as one approaches the outer boundary.Comment: LaTeX, figures upon reques

Phase synchronization from noisy univariate signals

We present methods for detecting phase synchronization of two unidirectionally coupled, self-sustained noisy oscillators from a signal of the driven oscillator alone. One method detects soft, another hard phase locking. Both are applied to the problem of detecting phase synchronization in von Karman vortex flow meters.Comment: 4 pages, 4 figure

Shuttle active thermal control system development testing. Volume 4, Book 1: Modular radiator system test data

A three-week test of a modular radiator system was conducted and plots of all key data recorded during the three-week test are presented

Rendimento de grãos de trigo cultivado em seqüência ao adubo verde nabo forrageiro.

bitstream/CNPT-2010/40481/1/p-co116.pd

Aluminium-oxide wires for superconducting high kinetic inductance circuits

We investigate thin films of conducting aluminium-oxide, also known as granular aluminium, as a material for superconducting high quality, high kinetic inductance circuits. The films are deposited by an optimised reactive DC magnetron sputter process and characterised using microwave measurement techniques at milli-Kelvin temperatures. We show that, by precise control of the reactive sputter conditions, a high room temperature sheet resistance and therefore high kinetic inductance at low temperatures can be obtained. For a coplanar waveguide resonator with 1.5\,k$\Omega$ sheet resistance and a kinetic inductance fraction close to unity, we measure a quality factor in the order of 700\,000 at 20\,mK. Furthermore, we observe a sheet resistance reduction by gentle heat treatment in air. This behaviour is exploited to study the kinetic inductance change using the microwave response of a coplanar wave guide resonator. We find the correlation between the kinetic inductance and the sheet resistance to be in good agreement with theoretical expectations.Comment: 16 pages, 7 figure