bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Investigation into the Spatial Variability of Near-Surface Air Temperatures in the Detroit, Michigan, Metropolitan Region
Authors: Oswald Evan M. , Rood Richard B. , Zhang Kai , Gronlund Carina J. , O’Neill Marie S. , White-Newsome Jalonne L. , Brines Shannon J. , Brown Daniel G. 
Published: April 2012

AbstractOn an annual basis, heat is the chief cause of weather-related deaths in the United States. Therefore, understanding the temperature structure where people live is important for reducing the health burden imposed by hot weather. This study focused on the air temperatures in the Detroit, Michigan, metropolitan region during the summer of 2009. An observational network was established that included 1) monitors sited in the backyards of residential participants, 2) National Weather Service standard observations, and 3) a network of monitors operated by the State of Michigan. Daily high and low temperatures were analyzed for spatial pattern, magnitude of spatial variability, and relationships with weather conditions. The existence of spatial variability was confirmed specifically during weather that was considered to be dangerous to public health. The relationships between temperature observations and distance to water, distance to city center, and local percent of impervious surface were investigated. The spatial variability during the daily low was typically stronger in magnitude and the spatial pattern was more consistent than were those during the daily high. The largest correlation with land-cover and location attributes was between values of percent of impervious surface and daily low temperatures. Daily high temperatures were most correlated with distance to water. Consistent with previous studies on spatial variability in urban environments, the results suggest a need for sensitivity to the spatially variable nature of exposure to heat events in both public health and urban planning. For example, these results showed that the downtown area experienced elevated temperatures during nights and that the eastern portions of Detroit experienced decreased temperatures during afternoons.
Seasonal Variation of Surface Temperature–Modulating Factors in the Sonoran Desert in Northwestern Mexico
Authors: Tereshchenko Iryna , Zolotokrylin Alexander N. , Titkova Tatiana B. , Brito-Castillo Luis , Monzon Cesar Octavio 
Published: April 2012

AbstractThe authors explore a new approach to monitoring of desertification that is based on use of results on the relation between albedo and surface temperature for the Sonoran Desert in northwestern Mexico. The criteria of predominance of radiation by using the threshold value of Advanced Very High Resolution Radiometer (AVHRR) and Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI) were determined. The radiation mechanism for regulating the temperature of the surface and the definition of threshold values for AVHRR and MODIS NDVI have an objective justification for the energy budget, which is based on the dominance of radiation surface temperature regulation in relation to evapotranspiration. Changes in the extent of arid regions with AVHRR NDVI of <0.08 and MODIS NDVI of <0.10 can be considered to be a characteristic in the evolution of desertification in the Sonoran Desert region. This is true because, in a certain year, the time span of the period when radiation factor predominates is important for the desertification process.
High-Resolution Simulations of Lee Waves and Downslope Winds over the Sierra Nevada during T-REX IOP 6
Authors: Sheridan Peter , Vosper Simon 
Published: April 2012

AbstractThe downslope windstorm during intensive observation period (IOP) 6 was the most severe that was detected during the Terrain-Induced Rotor Experiment (T-REX) in Owens Valley in the Sierra Nevada of California. Cross sections of vertical motion in the form of a composite constructed from aircraft data spanning the depth of the troposphere are used to link the winds experienced at the surface to the changing structure of the mountain-wave field aloft. Detailed analysis of other observations allows the role played by a passing occluded front, associated with the rapid intensification (and subsequent cessation) of the windstorm, to be studied. High-resolution, nested modeling using the Met Office Unified Model (MetUM) is used to study qualitative aspects of the flow and the influence of the front, and this modeling suggests that accurate forecasting of the timing and position of both the front and strong mountaintop winds is crucial to capture the wave dynamics and accompanying windstorm. Meanwhile, far ahead of the front, simulated downslope winds are shallow and foehnlike, driven by the thermal contrast between the upstream and valley air mass. The study also highlights the difficulties of capturing the detailed interaction of weather systems with large and complex orography in numerical weather prediction.
A Parametric Radiative Forcing Model for Contrail Cirrus
Authors: Schumann U. , Mayer B. , Graf K. , Mannstein H. 
Published: April 2012

AbstractA new parameterized analytical model is presented to compute the instantaneous radiative forcing (RF) at the top of the atmosphere (TOA) produced by an additional thin contrail cirrus layer (called “contrail” below). The model calculates the RF using as input the outgoing longwave radiation and reflected solar radiation values at TOA for a contrail-free atmosphere, so that the model is applicable for both cloud-free and cloudy ambient atmospheres. Additional input includes the contrail temperature, contrail optical depth (at 550 nm), effective particle radius, particle habit, solar zenith angle, and the optical depth of cirrus above the contrail layer. The model parameters (5 for longwave and 10 for shortwave) are determined from least squares fits to calculations from the “libRadtran” radiative transfer model over a wide range of atmospheric and surface conditions. The correlation coefficient between model and calculations is larger than 98%. The analytical model is compared with published results, including a 1-yr simulation of global RF, and is found to agree well with previous studies. The fast analytical model is part of a larger modeling system to simulate contrail life cycles (“CoCiP”) and can allow for the rapid simulation of contrail cirrus RF over a wide range of meteorological conditions and for a given size-dependent habit mixture. Ambient clouds are shown to have large local impact on the net RF of contrails. Net RF of contrails may both increase and decrease and even change sign in the presence of higher-level cirrus, depending on solar zenith angle.
The Importance of the Nontraditional Coriolis Terms in Large-Scale Motions in the Tropics Forced by Prescribed Cumulus Heating
Authors: Hayashi Michiya , Itoh Hisanori 
Published: April 2012

AbstractIn meteorological dynamics, the shallow-atmosphere approximation is generally used in the momentum equation, together with the “traditional approximation.” In the traditional approximation, two cosine Coriolis terms [hereafter called nontraditional Coriolis terms (NCTs)] and some metric terms are omitted. However, some studies have suggested that the omission of the NCTs may not be appropriate for conditions near the equator. Therefore, this paper investigates the effect of the NCTs on large-scale motions forced by local positive-only heating mimicking cumulus convection.The authors use the linearized quasihydrostatic equation system on an equatorial β plane. Prescribed heating is assumed to move eastward with the slow phase speed of an intraseasonal period. Results of scale analysis and numerical calculations show that differences with and without the NCTs (hereafter, contributions) exhibit the following four features. (i) Whereas contributions to horizontal divergence and vertical velocity are small, the NCTs have large effects on horizontal velocity (vertical vorticity) and perturbations of pressure, potential temperature, and density. (ii) Contributions to horizontal velocity and pressure perturbation have equivalent barotropic structure. (iii) Contributions show east–west asymmetric patterns, with large contributions appearing at the western side of the forcing. (iv) Contributions to vertical vorticity and pressure perturbation are extremely large when the meridional gradient of heating is large. These features can be comprehensively explained by the tilting of the meridional component of the planetary vorticity, which is caused by the meridional gradient of heating.
Climatic Role of North American Low-Level Jets on U.S. Regional Tornado Activity
Authors: Weaver Scott J. , Baxter Stephen , Kumar Arun 
Published: April 2012

Abstract
Variability of springtime tornadic activity over the United States is assessed through the connectivity of preferred modes of North American low-level jet (NALLJ) variability to the local thermodynamic environment and remote SST variations. The link between regional tornado activity and NALLJ variability as diagnosed from a consistent reanalysis system (i.e., NCEP–NCAR) serves as dynamical corroboration in light of the inhomogeneous tornado database. The analysis reveals a multidecadal variation in the strength of the NALLJ–tornado connection, highlighted by tornado activity in the southern Great Plains region nearly doubling its correlation with NALLJ principal component 1 (PC 1) in recent decades. Locally, this is a result of a southward shift of NALLJ variability modes during the recent period. Motivated by these epochal shifts in NALLJ activity, a comparison of the early (1950–78) and late (1979–2010) tornado and NALLJ SST linkages indicates an Atlantic decadal SST variability influence during the early epoch, with Pacific decadal variability thereafter, highlighting the remote SST influence on the shifts in geographic placement and strength of NALLJ variability. The remote SST variability linkages further reveal that the observed global-scale SST trend pattern over the last 61 years may be contributing to a shift toward weaker tornadoes during spring in the northern Great Plains region. Tornado activity over the southeast region of the United States shows no such relationship to the SST trend pattern during spring, an immunity that is unexpected if spurious trends in the tornado database were influencing the SST linkage.
Standing Eddies in the Meridional Overturning Circulation
Authors: Viebahn Jan , Eden Carsten 
Published: April 2012

Abstract
The role of standing eddies for the meridional overturning circulation (MOC) is discussed. The time-mean isopycnal meridional streamfunction is decomposed into a time- and zonal-mean part, a standing-eddy part, and a transient-eddy part. It turns out that the construction of an isopycnal MOC with an exactly vanishing standing-eddy part has to be performed by zonal integration along depth-dependent horizontal isolines of time-mean density. In contrast, zonal integration along time-mean geostrophic streamlines generally only leads to an isopycnal MOC with a reduced standing-eddy part. A generalized approach of constructing meridional transport streamfunctions by two tracer fields and the generalized way to neutralize the corresponding standing-eddy part is given to summarize the discussion.
Using the results of an idealized Southern Ocean model, it is demonstrated that neglecting the depth dependence of the zonal integration paths by integrating along density contours or geostrophic streamlines of a fixed depth (“contour depth”) may represent an acceptable approximation: although the standing-eddy part then exactly vanishes only at the contour depth (except for the ageostrophic surface layer using geostrophic streamlines), the overall standing-eddy part is significantly reduced for adequate contour depths. In the idealized Southern Ocean model, density contours at middepth and surface geostrophic streamlines represent the most adequate approximations. Moreover, it is found that the effect of changing the zonal integration paths from latitude circles to curvilinear paths on the zonally averaged density is of the same order as changing from Eulerian to isopycnal averaging.
The History (and Philosophy) of Religions
Authors: Rennie Bryan 
Published: April 2012

In a paper given at a Roundtable at the American Academy of Religion (AAR) National Annual Conference in Montreal in November of 2009, jointly organized by the North American Association for the Study of Religion and the Critical Theory and Discourses in Religion Group of the AAR, I argued for the ineluctably philosophical nature of what is most commonly called ‘method and theory in the study of religion.’ That paper ( Rennie, 2010 ) also argues that what is conventionally referred to as ‘philosophy of religion’ does not, strictly speaking, warrant that name since it is in fact a form of theology that utilizes philosophical methodologies to consider principally, if not exclusively, Christian concerns. I also argued that a philosophy of religion(s) constituted along the lines of the philosophy of science would be a potential improvement in both ‘philosophy of religion’ and ‘method and theory in the study of religion.’ In this paper I would like to consider—with the help of a closer look at contemporary philosophy of science—precisely what a reconstituted history (and philosophy) of religions might look like, how it might differ from current scholarship, and what it might achieve. Dans une communication donnée lors d’une table ronde à l’American Academy of Religion (AAR) National Annual Conference à Montréal en novembre 2009, organisée conjointement par le North American Association for the Study of Religion et le groupe de Critical Theory and Discourses in Religion de l’AAR, j’avais argué la nature inéluctablement philosophique de ce qui est couramment appelé « Method and Theory in the Study of Religion ». Cet article ( Rennie, 2010 ) soutient également la thèse que ce qu’on appelle couramment « Philosophie de la religion » ne correspond pas stricto sensu à ce qu’une telle dénomination recouvre puisqu’il s’agit en fait d’une forme de théologie recourant à des méthodes philosophiques pour envisager des préoccupations principalement, sinon exclusivement, chrétiennes. Je soutiens aussi qu’une philosophie des religions constituée à partir des lignes de force de la philosophie des sciences pourrait apporter une amélioration potentielle de la philosophie de la religion, de la méthode et de la théorie dans l’étude des religions. Dans cet article, j’aimerais examiner précisément —par le biais des apports de la philosophie des sciences contemporaine— ce à quoi l’histoire (et la philosophie) des religions pourrait ressembler, les termes dans lesquels elle se distinguerait des approches actuelles et ce à quoi nous pourrions ainsi aspirer.
New Directions for Philosophy of Religion: Four Proposals
Authors: Schilbrack Kevin 
Published: April 2012

This set of papers explores the topic of “Possible Futures for Philosophy of Religion.” Though the field of philosophy of religion today has grown relatively narrow, these four papers seek to stretch it back out and all four are (as befitting our topic) forward-looking. Although the papers cover several different issues, I am going to shoehorn them into that pre-conceived category—the future of philosophy of religion—and then focus on the parts of the papers central to that category and ignore the other parts that don’t fit that template. This will not do justice to the complexity of the reality I am describing, but this procrustean practice is not unusual in philosophy of religion. Cette palette d’articles explore la thématique des ‘futurs possibles pour la philosophie des religions’. Bien que le champ de la philosophie des religions se soit aujourd’hui relativement rétréci, ces quatre articles tentent de l’élargir à nouveau et tous les quatre sont (au bénéfice de la thématique) tournés vers son devenir. Bien qu’ils couvrent des aspects différents de cette thématique, je vais les faire entrer dans cette catégorie préconçue —le futur de la philosophie des religions— et me focaliserai sur les parties des textes qui sont essentielles à cette catégorie pour en ignorer celles qui n’entrent pas dans ce cadre précis. Une telle approche ne saurait rendre compte de la complexité de la réalité que je décris, mais cette pratique de Procuste n’est point inhabituelle en philosophie des religions.
Sensitivity of Physiological Measures for Detecting Systematic Variations in Cognitive Demand From a Working Memory Task
Authors: Mehler Bruce , Reimer Bryan , Coughlin Joseph F. 
Published: April 2012

Objective: To assess the sensitivity of two physiological measures for discriminating between levels of cognitive demand under driving conditions across different age groups. Background: Previous driving research presents a mixed picture concerning the sensitivity of physiological measures for differentiating tasks with presumed differences in mental workload. Method: A total of 108 relatively healthy drivers balanced by gender and across three age groups (20–29, 40–49, 60–69) engaged in three difficulty levels of an auditory presentation–verbal response working memory task. Results: Heart rate and skin conductance level (SCL) both increased in a statistically significant fashion with each incremental increase in cognitive demand, whereas driving performance measures did not provide incremental discrimination. SCL was lower in the 40s and 60s age groups; however, the pattern of incremental increase with higher demand was consistent for heart rate and SCL across all age groups. Although each measure was quite sensitive at the group level, considering both SCL and heart rate improved detection of periods of heightened cognitive demand at the individual level. Conclusion: The data provide clear evidence that two basic physiological measures can be utilized under field conditions to differentiate multiple levels of objectively defined changes in cognitive demand. Methodological considerations, including task engagement, may account for some of the inconsistencies in previous research. Application: These findings increase the confidence with which these measures may be applied to assess relative differences in mental workload when developing and optimizing human machine interface (HMI) designs and in exploring their potential role in advanced workload detection and augmented cognition systems.
Spatiotemporal distribution of white matter lesions in relapsing–remitting and secondary progressive multiple sclerosis
Authors: Filli Lukas , Hofstetter Louis , Kuster Pascal , Traud Stefan , Mueller-Lenke Nicole , Naegelin Yvonne , Kappos Ludwig , Gass Achim , Sprenger Till , Nichols Thomas E , Vrenken Hugo , Barkhof Frederik , Polman Chris , Radue Ernst-Wilhelm , Borgwardt Stefan J , Bendfeldt Kerstin 
Published: April 2012

Background: Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system. MS lesions show a typical distribution pattern and primarily affect the white matter (WM) in the periventricular zone and in the centrum semiovale. Objective: To track lesion development during disease progression, we compared the spatiotemporal distribution patterns of lesions in relapsing–remitting MS (RRMS) and secondary progressive MS (SPMS). Methods: We used T1 and T2 weighted MR images of 209 RRMS and 62 SPMS patients acquired on two different 1.5 Tesla MR scanners in two clinical centers followed up for 25 (± 1.7) months. Both cross-sectional and longitudinal differences in lesion distribution between RRMS and SPMS patients were analyzed with lesion probability maps (LPMs) and permutation-based inference. Results: MS lesions clustered around the lateral ventricles and in the centrum semiovale. Cross-sectionally, compared to RRMS patients, the SPMS patients showed a significantly higher regional probability of T1 hypointense lesions ( p≤0.03) in the callosal body, the corticospinal tract, and other tracts adjacent to the lateral ventricles, but not of T2 lesions (peak probabilities were RRMS: T1 9%, T2 18%; SPMS: T1 21%, T2 27%). No longitudinal changes of regional T1 and T2 lesion volumes between baseline and follow-up scan were found. Conclusion: The results suggest a particular vulnerability to neurodegeneration during disease progression in a number of WM tracts.
MRI-based clinical trials in relapsing–remitting MS: new sample size calculations based on a longitudinal model
Authors: Altman RM , Petkau AJ , Vrecko D , Smith A 
Published: April 2012

Background: Sample sizes for magnetic resonance imaging (MRI)-based clinical trials in multiple sclerosis (MS) generally assume that lesion counts are reasonably described by the negative binomial (NB) model. Objective: This study aimed to assess the appropriateness of the NB model for lesion count data and to provide sample sizes for placebo-controlled, MRI-based clinical trials in relapsing–remitting MS using a more realistic model. Methods: The fit of the NB model in each arm of five MS clinical trials was assessed using Pearson’s chi-squared statistic. Required sample sizes associated with various tests of treatment effect were estimated by simulating data from a new, longitudinal model for repeated lesion count data on individual patients. Results: Evidence ( p < 0.05) against the NB model was found in at least one arm of four of the five trials. If a trial is designed using this model but the resulting clinical data do not follow its assumptions then this trial can be seriously under-powered for assessing differences in mean lesion counts. Conclusion: Sample sizes based on the longitudinal model are more realistic and often smaller than those previously reported using the NB model.
Osteoprotegerin, leptin and IL-6: Association with silent myocardial ischemia in type 2 diabetes mellitus
Authors: Guzel Savas , Seven Arzu , Kocaoglu Ali , Ilk Banu , Guzel Eda C , Saracoglu Gamze V , Celebi Aslan 
Published: April 2012

Background: Diabetic patients often exhibit severe, asymptomatic coronary artery disease (CAD). The relationship between osteoprotegerin (OPG), inflammatory markers and silent myocardial ischemia remains to be elucidated. Methods: We recruited 45 type 2 diabetic patients and 33 healthy controls and assessed them for silent myocardial ischemia (SMI) by myocardial perfusion imaging. Patient blood was tested for OPG, IL-6 and leptin concentrations. Results: OPG, leptin and IL-6 levels were found significantly elevated in diabetic patients ( p < 0.001, p < 0.01, p < 0.05). Based on our classification of presence/absence of SMI in our diabetic group, we found that there was a significant association between SMI and the biomarkers IL-6 ( p < 0.001), leptin ( p < 0.001) and OPG ( p < 0.05). In multivariate regression analyses, OPG was found to be significantly related to diabetes mellitus and to SMI. Age, sex and smoking increased the association between OPG and SMI. Conclusion: High OPG, leptin and IL-6 levels are associated with the presence and severity of SMI in type 2 diabetic patients.