PRESERVATION OR DEVELOPMENT: COMPETING USES OVER THE FUTURE OF FARMLAND IN URBANIZING AREAS

Land use, farmland preservation, competing risks models, multinomial logit models, Resource /Energy Economics and Policy,

Fault-tolerant error correction with the gauge color code

The constituent parts of a quantum computer are inherently vulnerable to errors. To this end we have developed quantum error-correcting codes to protect quantum information from noise. However, discovering codes that are capable of a universal set of computational operations with the minimal cost in quantum resources remains an important and ongoing challenge. One proposal of significant recent interest is the gauge color code. Notably, this code may offer a reduced resource cost over other well-studied fault-tolerant architectures using a new method, known as gauge fixing, for performing the non-Clifford logical operations that are essential for universal quantum computation. Here we examine the gauge color code when it is subject to noise. Specifically we make use of single-shot error correction to develop a simple decoding algorithm for the gauge color code, and we numerically analyse its performance. Remarkably, we find threshold error rates comparable to those of other leading proposals. Our results thus provide encouraging preliminary data of a comparative study between the gauge color code and other promising computational architectures.Comment: v1 - 5+4 pages, 11 figures, comments welcome; v2 - minor revisions, new supplemental including a discussion on correlated errors and details on threshold calculations; v3 - Author accepted manuscript. Accepted on 21/06/16. Deposited on 29/07/16. 9+5 pages, 17 figures, new version includes resource scaling analysis in below threshold regime, see eqn. (4) and methods sectio

Axisymmetric reacting gas nonequilibrium performance program

Computer program calculates the inviscid one-dimensional equilibrium, frozen, and nonequilibrium nozzle expansion of propellant exhaust mixtures containing these six elements - carbon, hydrogen, oxygen, nitrogen, fluorine, and chlorine plus either aluminum, beryllium, boron or lithium. This program will perform calculations for contoured and conical nozzles

Alien Registration- Nickerson, Ruth E. (Belfast, Waldo County)

https://digitalmaine.com/alien_docs/4119/thumbnail.jp

Engineering and programming manual: Two-dimensional kinetic reference computer program (TDK)

The Two Dimensional Kinetics (TDK) computer program is a primary tool in applying the JANNAF liquid rocket thrust chamber performance prediction methodology. The development of a methodology that includes all aspects of rocket engine performance from analytical calculation to test measurements, that is physically accurate and consistent, and that serves as an industry and government reference is presented. Recent interest in rocket engines that operate at high expansion ratio, such as most Orbit Transfer Vehicle (OTV) engine designs, has required an extension of the analytical methods used by the TDK computer program. Thus, the version of TDK that is described in this manual is in many respects different from the 1973 version of the program. This new material reflects the new capabilities of the TDK computer program, the most important of which are described

An Empirical Examination of Real Options and the Timing of Land Conversions

Many studies have examined the effects of land use regulations on land prices and urban spatial form. Increasingly, jurisdictions have adopted incentive based mechanisms, such as purchase of development rights (PDR) programs, to manage the pace and pattern of urban growth and the conversion of agricultural land. PDR programs provide a third option to landowners in urbanizing areas: in addition to deciding whether to develop or not, landowners can decide whether to preserve their land. To our knowledge no studies have explored how the existence of an option to participate in a PDR program affects landowners' development decisions. This research provides empirical evidence of a previously untested prediction of real options theory: that additional options increase the value of waiting to make irreversible decisions. Our paper considers how an additional land use alternative, preservation, conveys a different type of option value and how that option affects the optimal conversion time. We estimate a hazard model and find significant evidence that the option to enter an easement decreases the hazard rate of development by about 40%. The results suggest that PDR programs can provide additional open space and amenity values beyond what is provided on preserved parcels, by delaying development (by at least a few years) of parcels that are not actually preserved.agricultural preservation programs, real options, land conversion, Land Economics/Use,

Journaling as a Test Preparatory Measure in Secondary Mathematics: Successful Student Strategies

This study examines a math journal writing assignment comparing how high school (grades 10 through 12) algebra students who performed well and students who performed poorly on traditional mathematics tests constructed their corresponding journal entries. Statistically significant differences found indicated that students who performed well on the tests were more likely to have originally composed the text and examples in their journal entries, and students who performed poorly were more likely to have copied much of the mathematical language and examples in their journal entries from their textbooks. Students who performed well on the test were also more likely to include examples accompanied by explanation for each step toward a solution. An assignment involving several such explanatory examples could perform a same or similar function as the longer journal assignment examined in this study

Clarity from Confusion: Using Intended Interactions to Design Information Systems

Two tools are described that help designers visualize the structure of a system in the requirements phase of a project. First, a matrix is constructed that represents the tendency of components to interact. The matrix is derived from sequence diagrams, which in turn are based on textual scenarios. This interaction matrix is transformed into a structure plot of the system, showing a graph of the essential connections between actors. Second, this same matrix is used to generate a sequence plot: a sequence diagram optimized for problem-solving. We illustrate the effectiveness of this approach, first with a simulation study, and later with a participant-based study of inference from diagrams. The results suggest that a similarity-based approach to information systems design can generate new testable tools. Pragmatically, the tools help novices and experts alike by automatically generating candidate system configurations in the form of structural diagrams, and by generating better sequence diagrams

Selecting children for head CT following head injury

OBJECTIVE: Indicators for head CT scan defined by the 2007 National Institute for Health and Care Excellence (NICE) guidelines were analysed to identify CT uptake, influential variables and yield. DESIGN: Cross-sectional study. SETTING: Hospital inpatient units: England, Wales, Northern Ireland and the Channel Islands. PATIENTS: Children (3 years were much more likely to have CT than those <3 years (OR 2.35 (95% CI 2.08 to 2.65)). CONCLUSION: Compliance with guidelines and diagnostic yield was variable across age groups, the type of hospital and region where children were admitted. With this pattern of clinical practice the risks of both missing intracranial injury and overuse of CT are considerable

A Circular Dichroic Study of Cu (II) -Ribonuclease Complexes

The visible and ultraviolet circular dichroic (CD) spectra resulting from the interaction of ribonuclease with successive Cu(I1) ions have been recorded under a variety of conditions. At pH 7 in the presence of 0.16 M KC1 a broad, negative band was found in the visible region. This band increased in intensity and changed in shape as successive coppers were added. The circular dichroic spectra could be analyzed in terms of two kinds of binding sites: a single strong site with CD minimum at about 710 nm, and four weaker sites with CD minimum at about 600 nm. The binding constants observed are close to those obtained by more conventional means. Carboxymethylation of one histidine results in loss of one of the weaker sites. In 0.01 M salt, only the 600-nm band is seen. Binding at pH 9.6 differed in that saturation did not occur until about 33 sites had been filled. The presence of tetra coordination at this pH was indicated by the shift of the primary d-d transition down to 530 nm. Additional structure in the visible and near ultraviolet CD was now present in the form of a negative band at 355 nm and, for the first two Cu(II)‘s added, a positive one at 480 nm. Strong positive bands were observed at 251 and 305 nm for all pH values ≥7. These are tentatively ascribed to charge transfer complexes between Cu(I1) and the peptide backbone. The relationship of the Cu(II)-ribonuclease CD spectra to those of natural, copper-containing metalloproteins, both “blue” and “non-blue”, is discussed, with special emphasis on the oxyhemocyanins