bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi‐system‐multi‐operator localization in PLMN using neural networks
Authors: Borenovic M. , Neskovic A. , Budimir D. 
Published: March 2011

SUMMARYProviding the localization algorithm for context‐aware services is the focus of many studies. This paper explores the properties of positioning models based on received signal strength (RSS) in PLMN (Public Land Mobile Network) networks. The effects of using the RSS at a mobile terminal from various systems, such as GSM and UMTS, as well as from multiple operators, have been investigated and discussed. Twenty‐two models, based on artificial neural networks, have been developed and verified using the data from an immense measurement campaign. The obtained results show that augmenting the model with additional RSS data, even from systems with poor radio‐visibility, may improve the positioning accuracy to as much as a 35thinspacem median distance error in a light urban environment. The degradation of accuracy in indoor environments and the complexity and latency of the models were also scrutinized. Copyright © 2011 John Wiley & Sons, Ltd.
Effect of thimerosal on Ca2+ movement and apoptosis in PC3 prostate cancer cells
Authors: Liao Wei‐Chuan , Chou Chiang‐Ting , Kuo Chun‐Chi , Pan Chih‐Chuan , Kuo Daih‐Huang , Shieh Pochuen , Cheng Jin‐Shiung , Jan Chung‐Ren , Shaw Chen‐Fu 
Published: March 2011

AbstractThe present study evaluated the effects of thimerosal, a vaccine preservative, on cytosolic free Ca2+ concentrations ([Ca2+]i) in human prostate cancer cells (PC3). Thimerosal (10–200 µM) increased [Ca2+]i in a concentration‐dependent manner. The Ca2+ signal was reduced partly by removing extracellular Ca2+. Thimerosal‐induced Ca2+ influx was inhibited by econazole, SKF963656, the phospholipase A2 inhibitor aristolochic acid, and protein kinase C modulators [phorbol 12‐myristate 13‐acetate (PMA) and GF109203X]. In Ca2+‐free medium, a 200‐µM thimerosal‐induced [Ca2+]i rise was partly inhibited after pretreatment with 2,5‐di‐tert‐butylhydroquinone (BHQ) (an endoplasmic reticulum Ca2+ pump inhibitor). Thimerosal at 1–7 µM induced cell death in a concentration‐dependent manner that was not reversed when cytosolic Ca2+ was chelated with 1,2‐bis(2‐aminophenoxy)ethane‐N,N,N′,N′‐tetraacetic acid (BAPTA). Propidium iodide staining suggests that apoptosis played a role in the death. Collectively, in PC3 cells, thimerosal induced [Ca2+]i rise by causing Ca2+ release from the endoplasmic reticulum and Ca2+ influx via store‐operated Ca2+ channels in a manner regulated by protein kinase C and phospholipase A2. Thimerosal also induced cell death in a Ca2+‐independent apoptotic manner. Drug Dev Res 72: 330–336, 2011.   © 2011 Wiley‐Liss, Inc.
Effect of single doses of methoxypolyethylene glycol‐epoetin beta (CERA, Mircera™) and epoetin delta (Dynepo™) on isoelectric erythropoietin profiles and haematological parameters
Authors: Dehnes Yvette , Hemmersbach Peter 
Published: March 2011

AbstractErythropoietin (EPO) has been misused in sports for many years due to its performance‐enhancing effect. In the last decade, detection of abuse has been possible with isoelectric focusing (IEF) based on the different isoform profiles of endogenous and recombinant EPO. The release of new EPOs on the market, such as the recombinant erythropoietin epoetin delta (Dynepo™) and the chemically modified EPO, CERA (Mircera™) potentially represents analytical challenges to the fight against doping. This study set out to investigate the possibility of and the time window for detecting the administration of a single dose of Dynepo™ and CERA. Our results are in agreement with earlier findings that detection of Dynepo™ is best achieved by combining IEF with SDS‐PAGE. Haematological parameters were monitored for possible effects due to the long half‐life (130 hours) of CERA in blood. Interestingly, although several haematological parameters were significantly changed after the injection of CERA, the endogenous EPO signal was still present in all collected samples. Due to the long half‐life and the large size of the CERA molecule (about 60 kDa), it was uncertain whether CERA would be excreted into urine in detectable amounts unless urine collection was preceded by strenuous physical exercise. We find that CERA can be detected in urine without prior exercise in several, but not all, subjects. CERA is nevertheless best detected in serum with regard to both probability and length of detection, in addition to stability in matrix over time. Copyright © 2011 John Wiley & Sons, Ltd.
A Manganese(II) Sandwich‐Type Phosphotungstate Complex – Synthesis, Structural Characterization and Catalytic Activity towards Liquid‐Phase Aerobic Epoxidation of Alkenes
Authors: Patel Ketan , Tripuramallu Bharat Kumar , Patel Anjali 
Published: March 2011

AbstractThe dimeric, tetranuclear manganese(II)‐substituted sandwich‐type phosphotungstate complex has been synthesized in high yield using a straightforward one‐pot synthesis by reacting commercially available H3[PW12O40] with MnCl2. The complex has been characterized by single‐crystal X‐ray structure analysis. The complex is oxidatively and solvolytically stable and has been used as a heterogeneous catalyst in the efficient, selective aerobic epoxidation of styrene, cyclohexene and cis‐cyclooctene.
Au@MOF‐5 and Au/MOx@MOF‐5 (M = Zn, Ti; x = 1, 2): Preparation and Microstructural Characterisation
Authors: Müller Maike , Turner Stuart , Lebedev Oleg I. , Wang Yuemin , van Tendeloo Gustaaf , Fischer Roland A. 
Published: March 2011

AbstractThe Zn‐carboxylate‐based porous coordination polymer MOF‐5 [Zn4O(bdc)3] and the metal oxide loaded materials ZnO@MOF‐5 and TiO2@MOF‐5 were loaded in a second step with the precursor [ClAuCO] to yield intermediate materials denoted as [ClAuCO]@MOF‐5, [ClAuCO]/ZnO@MOF‐5 and [ClAuCO]/TiO2@MOF‐5. These composites were decomposed to Au@MOF‐5, Au/ZnO@MOF‐5 and Au/TiO2@MOF‐5 under hydrogen at 100 °C. The nanoparticle‐loaded hybrid materials were characterised by powder X‐ray diffraction (PXRD), IR spectroscopy, X‐ray photoelectron spectroscopy (XPS) and N2 sorption measurements, which reveal an intact MOF‐5 structure that maintains a high specific surface area. For Au@MOF‐5, crystalline Au nanoparticles were distributed over the MOF matrix in a homogeneous fashion with a size of ca. 1–3 nm, evidenced by high resolution transmission electron microscopy. In the case of Au/ZnO@MOF‐5, the Au and metal oxide particles of a few nm in size were coexistent in a given volume of the MOF‐5 matrix and were not separated in different crystalline MOF particles. For the TiO2 loaded materials the oxide is preferentially located near the outer surface of the MOF particles, leading to an increase of larger exterior Au particles in comparison to very small interior Au particles as observed for the other materials. Au@MOF‐5, Au/ZnO@MOF‐5 and Au/TiO2@MOF‐5 were tested in liquid‐phase oxidation of alcohols. Preliminary results show a high activity for the Au loaded materials in this reaction. This observation is attributed to the microstructure of the composites with very small Au particles distributed homogeneously over the MOF matrix.
Synthesis, Gelation Properties and Photopolymerization of Macrocyclic Diacetylenedicarboxamides Derived from L‐Glutamic Acid and trans‐1,4‐Cyclohexanediol
Authors: Nagasawa Jun'ichi , Yoshida Masaru , Tamaoki Nobuyuki 
Published: March 2011

AbstractNovel macrocyclic diacetylene compounds derived from L‐glutamic acid and trans‐1,4‐cyclohexanediol have been synthesized and their gelation ability, photopolymerizability and aggregation state have been studied. Most of the compounds with decyl groups gelatinize hexane, cyclohexane, cyclohexene and carbon tetrachloride. Some of the compounds also gelatinize toluene and 2‐propanol. An FTIR spectroscopy study indicated hydrogen‐bonding in the gel state. An X‐ray crystallographic analysis of one of the macrocyclic compounds with methyl groups demonstrated a tubular assembly based on the face‐to‐face packing of the macrocyclic rings as a result of intermolecular hydrogen‐bonding. Upon photoirradiation, most of the gels changed their hue from colourless to red or orange, which suggests photopolymerization of the diacetylene moieties.
Do cultural values predict individuals' moral attitudes? A cross‐cultural multilevel approach
Authors: Vauclair Christin‐Melanie , Fischer Ronald 
Published: March 2011

AbstractThis study examined whether cultural values predict individuals' moral attitudes. The main objective was to shed light on the moral universalism and relativism debate by showing that the answer depends on the moral issues studied. Using items from the Morally Debatable Behaviours Scale (MDBS) fielded in the World Value Survey (WVS), we found that moral issues can be differentiated cross‐culturally into attitudes towards (1) dishonest–illegal and (2) personal–sexual issues. Drawing upon evolutionary and cultural theories, we expected that the former moral domain is not related to cultural values, whereas the latter is influenced by cultural conceptions of the self (i.e. independent versus interdependent selves). We used multilevel modelling with Schwartz' cultural values as the independent variables and the two moral domains as assessed through the MDBS as dependent variables to test our hypothesis. After controlling for individual‐level differences in moral attitudes as well as the socio‐economic development of countries, our findings confirmed that attitudes towards dishonest–illegal issues were not related to cultural values whereas attitudes towards personal–sexual issues were predicted by the Autonomy–Embeddedness value dimension. We conclude that our study sheds not only light on the universalism and relativism debate, but also on the discriminant validity of cultural values. Copyright © 2011 John Wiley & Sons, Ltd.
Numerical computations of a theoretical model of ribbed moraine formation
Authors: Chapwanya Michael , Clark Chris D. , Fowler Andrew C. 
Published: March 2011

ABSTRACTWe develop numerical solutions of a theoretical model which has been proposed to explain the formation of subglacial bedforms. The model has been shown to have the capability of producing bedforms in two dimensions, when they may be interpreted as ribbed moraine. However, these investigations have left unanswered the question of whether the theory is capable of producing fully three‐dimensional bedforms such as drumlins. We show that, while the three‐dimensional calculations show realistic quasi‐three‐dimensional features such as dislocations in the ribbing pattern, they do not produce genuine three‐dimensional drumlins. We suggest that this inadequacy is due to the treatment of subglacial drainage in the theory as a passive variable, and thus that the three‐dimensional forms may be associated with conditions of sufficient subglacial water flux. Copyright © 2011 John Wiley & Sons, Ltd.
Evaluation of the effectiveness of the fire retardant mixture containing potassium carbonate using a cone calorimeter
Authors: Grześkowiak Wojciech Łukasz 
Published: March 2011

SUMMARYThis article presents the results of investigations obtained for a wood fire retardant agent which is currently under production. Experiments were conducted using a mixture of potassium carbonate and urea in accordance with the PN‐C‐04914 standard (the Polish equivalent of ISO 5660‐1). Wood samples of Scots pine (Pinus sylvestris L.) were treated with the above mixture as well as with its individual components. It was observed that impregnation of samples with potassium carbonate and a mixture of potassium carbonate and urea has an advantageous influence on the reduction of the heat release and the heat of combustion, and also prolongs the time to ignition. Urea alone failed to exert a fire‐retardant effect on wood samples. Copyright © 2011 John Wiley & Sons, Ltd.
Forecasting Hourly Peak Call Volume for a Rural Electric Cooperative Call Center
Authors: Kim Taeyoon , Kenkel Phil , Brorsen B. Wade 
Published: March 2011

ABSTRACTThis research forecasts peak call volume of a centralized after‐hours call center for rural electric cooperatives to help the call center determine staffing levels. A Gaussian copula is used to capture the dependence among non‐normal distributions. Using a centralized call center reduces costs by approximately 75% compared to having individual call centers at each cooperative. Adding cooperatives to the centralized call center is projected to further decrease costs per member. An out‐of‐sample forecasting exercise after the call center expanded validated the model's forecast that additional cooperatives could be added without a proportional increase in the peak number of calls. Copyright © 2011 John Wiley & Sons, Ltd.
Cortical organization of environmental sounds by attribute
Authors: Hocking Julia , McMahon Katie L. , de Zubicaray Greig I. 
Published: March 2011

AbstractSemantic knowledge is supported by a widely distributed neuronal network, with differential patterns of activation depending upon experimental stimulus or task demands. Despite a wide body of knowledge on semantic object processing from the visual modality, the response of this semantic network to environmental sounds remains relatively unknown. Here, we used fMRI to investigate how access to different conceptual attributes from environmental sound input modulates this semantic network. Using a range of living and manmade sounds, we scanned participants whilst they carried out an object attribute verification task. Specifically, we tested visual perceptual, encyclopedic, and categorical attributes about living and manmade objects relative to a high‐level auditory perceptual baseline to investigate the differential patterns of response to these contrasting types of object‐related attributes, whilst keeping stimulus input constant across conditions. Within the bilateral distributed network engaged for processing environmental sounds across all conditions, we report here a highly significant dissociation within the left hemisphere between the processing of visual perceptual and encyclopedic attributes of objects. Hum Brain Mapp, 2011. © 2011 Wiley‐Liss, Inc.
Domain general and domain preferential brain regions associated with different types of task switching: A Meta‐Analysis
Authors: Kim Chobok , Cilles Sara E. , Johnson Nathan F. , Gold Brian T. 
Published: March 2011

AbstractOne of our highest evolved functions as human beings is our capacity to switch between multiple tasks effectively. A body of research has identified a distributed frontoparietal network of brain regions which contribute to task switching. However, relatively less is known about whether some brain regions may contribute to switching in a domain‐general manner while others may be more preferential for different kinds of switching. To explore this issue, we conducted three meta‐analyses focusing on different types of task switching frequently used in the literature (perceptual, response, and context switching), and created a conjunction map of these distinct switch types. A total of 36 switching studies with 562 activation coordinates were analyzed using the activation likelihood estimation method. Common areas associated with switching across switch type included the inferior frontal junction and posterior parietal cortex. In contrast, domain‐preferential activation was observed for perceptual switching in the dorsal portion of the premotor cortex and for context switching in frontopolar cortex. Our results suggest that some regions within the frontoparietal network contribute to domain‐general switching processes while others contribute to more domain‐preferential processes, according to the type of task switch performed. Hum Brain Mapp, 2011. © 2011 Wiley Periodicals, Inc.
Mapping reflexive shifts of attention in eye‐centered and hand‐centered coordinate systems
Authors: Cazzato Valentina , Macaluso Emiliano , Crostella Filippo , Aglioti Salvatore Maria 
Published: March 2011

AbstractBehavioral studies indicate that directional gaze and hand pointing are fundamental social signals that may capture spatial attention more powerfully than directional arrows. By using fMRI, we explored whether reflexive shifts of attention triggered by different distracters were influenced by the motor effector used for performing an overt response. In separate blocks, healthy participants performed a directional saccadic or a hand pointing movement. Color changes of a central black fixation point constituted the imperative instruction signal to make a leftward (red color) or a rightward (blue color) movement while ignoring distracting leftward or rightward oriented gaze, hand pointing, or arrow. Distracters that were directionally incongruent with the instruction cue impaired the saccadic and pointing‐release RTs. The comparison of incongruent vs. congruent conditions showed an increase of BOLD signal in the frontal eye field (FEF), the intraparietal sulcus (IPS), and the posterior parietal cortex (PPC) bilaterally. Importantly, a specific relationship between distracter and effector used for the response was found in these frontal and parietal regions. In particular, higher activity in the FEF, for distracting gaze was found mainly during the saccadic response task. In the same vein, higher activity in the left and right IPS regions was found for the distracting hand mainly in the hand pointing task. The results suggest that reflexive shifts of attention triggered by social signals are coded in the fronto‐parietal cortex according to effector‐specific mapping rules. Hum Brain Mapp, 2012. © 2011 Wiley Periodicals, Inc.
Experience induces functional reorganization in brain regions involved in odor imagery in perfumers
Authors: Plailly Jane , Delon‐Martin Chantal , Royet Jean‐Pierre 
Published: March 2011

AbstractAreas of expertise that cultivate specific sensory domains reveal the brain's ability to adapt to environmental change. Perfumers are a small population who claim to have a unique ability to generate olfactory mental images. To evaluate the impact of this expertise on the brain regions involved in odor processing, we measured brain activity in novice and experienced (student and professional) perfumers while they smelled or imagined odors. We demonstrate that olfactory imagery activates the primary olfactory (piriform) cortex (PC) in all perfumers, demonstrating that similar neural substrates were activated in odor perception and imagination. In professional perfumers, extensive olfactory practice influences the posterior PC, the orbitofrontal cortex, and the hippocampus; during the creation of mental images of odors, the activity in these areas was negatively correlated with experience. Thus, the perfumers' expertise is associated with a functional reorganization of key olfactory and memory brain regions, explaining their extraordinary ability to imagine odors and create fragrances. Hum Brain Mapp, 2012. © 2011 Wiley Periodicals, Inc.
Feature‐based groupwise registration by hierarchical anatomical correspondence detection
Authors: Wu Guorong , Wang Qian , Jia Hongjun , Shen Dinggang 
Published: March 2011

AbstractGroupwise registration has been widely investigated in recent years due to its importance in analyzing population data in many clinical applications. To our best knowledge, most of the groupwise registration algorithms only utilize the intensity information. However, it is well known that using intensity only is not sufficient to achieve the anatomically sound correspondences in medical image registration. In this article, we propose a novel feature‐based groupwise registration algorithm to establish the anatomical correspondence across subjects by using the attribute vector that is defined as the morphological signature for each voxel. Similar to most of the state‐of‐the‐art groupwise registration algorithms, which simultaneously estimate the transformation fields for all subjects, we develop an energy function to minimize the intersubject discrepancies on anatomical structures and drive all subjects toward the hidden common space. To make the algorithm efficient and robust, we decouple the complex groupwise registration problem into two easy‐to‐solve subproblems, namely (1) robust correspondence detection and (2) dense transformation field estimation, which are systematically integrated into a unified framework. To achieve the robust correspondences in the step (1), several strategies are adopted. First, the procedure of feature matching is evaluated within a neighborhood, rather than only on a single voxel. Second, the driving voxels with distinctive image features are designed to drive the transformations of other nondriving voxels. Third, we take advantage of soft correspondence assignment not only in the spatial domain but also across the population of subjects. Specifically, multiple correspondences are allowed to alleviate the ambiguity in establishing correspondences w.r.t. a particular subject and also the contributions from different subjects are dynamically controlled throughout the registration. Eventually in the step (2), based on the correspondences established for the driving voxels, thin‐plate spline is used to propagate correspondences on the driving voxels to other locations in the image. By iteratively repeating correspondence detection and dense deformation estimation, all the subjects will be aligned onto the common space. Our feature‐based groupwise registration algorithm has been extensively evaluated over 18 elderly brains, 16 brains from NIREP (with 32 manually delineated labels), 40 brains from LONI LPBA40 (with 54 manually delineated labels), and 12 pairs of normal controls and simulated atrophic brain images. In all experiments, our algorithm achieves more robust and accurate registration results, compared with another groupwise algorithm and a pairwise registration method. Hum Brain Mapp, 2012. © 2011 Wiley Periodicals, Inc.
Acute alcohol intoxication impairs top–down regulation of stroop incongruity as revealed by blood oxygen level‐dependent functional magnetic resonance imaging
Authors: Marinkovic Ksenija , Rickenbacher Elizabeth , Azma Sheeva , Artsy Elinor 
Published: March 2011

AbstractFunctional neuroanatomy of executive functions has been delineated in a large number of neuroimaging studies using conflict‐inducing tasks. The neural basis of alcohol's effects on cognitive control is poorly understood despite the evidence of impaired ability to evaluate competing demands and to inhibit maladaptive responses. To investigate the effects of moderate intoxication, healthy social drinkers participated in both alcohol (0.60 g/kg ethanol for men, 0.55 g/kg for women) and placebo conditions while being scanned using blood oxygen level‐dependent (BOLD) functional magnetic resonance imaging (fMRI). A modified four‐color Stroop task combined reading and color naming and used manual responses. Twenty subjects (10 women) were instructed to press a button corresponding to the font color except when a word was written in gray in which case they had to respond to the meaning of the word. Alcohol increased reaction times and a tendency to make more errors on incongruent trials. Behavioral indices of alcohol‐induced premature responding correlated with the current drinking levels and impulsivity traits, suggesting an interaction between alcohol effects and personality predispositions. A distributed frontoparietal cortical network was activated by incongruity. However, moderate alcohol inebriation selectively attenuated anterior cingulate cortex (ACC) activation during both high‐conflict trials and erroneous responses, indicating vulnerability of the regulative function subserved by the ACC. By disrupting top–down, strategic processing, alcohol may interfere with goal‐directed behavior, resulting in poor self control. The present results support models proposing that alcohol‐induced prefrontal impairments diminish inhibitory control and are modulated by dispositional risk factors and levels of alcohol consumption. Hum Brain Mapp, 2012. © 2011 Wiley Periodicals, Inc.