bluuebunny/crossref_metadata_2025_split huggingface dataset:
Anin vivostudy of hindfoot 3D kinetics in stage II posterior tibial tendon dysfunction (PTTD) flatfoot based on weight-bearing CT scan
Authors: Zhang Y. , Xu J. , Wang X. , Huang J. , Zhang C. , Chen L. , Wang C. , Ma X. 
Published: December 2013

ObjectiveThe objective of this study was to evaluate the rotation and translation of each joint in the hindfoot and compare the load response in healthy feet with that in stage II posterior tibial tendon dysfunction (PTTD) flatfoot by analysing the reconstructive three-dimensional (3D) computed tomography (CT) image data during simulated weight-bearing.MethodsCT scans of 15 healthy feet and 15 feet with stage II PTTD flatfoot were taken first in a non-weight-bearing condition, followed by a simulated full-body weight-bearing condition. The images of the hindfoot bones were reconstructed into 3D models. The ‘twice registration’ method in three planes was used to calculate the position of the talus relative to the calcaneus in the talocalcaneal joint, the navicular relative to the talus in talonavicular joint, and the cuboid relative to the calcaneus in the calcaneocuboid joint.ResultsFrom non- to full-body-weight-bearing condition, the difference in the talus position relative to the calcaneus in the talocalcaneal joint was 0.6° more dorsiflexed (p = 0.032), 1.4° more everted (p = 0.026), 0.9 mm more anterior (p = 0.031) and 1.0 mm more proximal (p = 0.004) in stage II PTTD flatfoot compared with that in a healthy foot. The navicular position difference relative to the talus in the talonavicular joint was 3° more everted (p = 0.012), 1.3 mm more lateral (p = 0.024), 0.8 mm more anterior (p = 0.037) and 2.1 mm more proximal (p = 0.017). The cuboid position difference relative to the calcaneus in the calcaneocuboid joint did not change significantly in rotation and translation (all p ≥ 0.08).ConclusionReferring to a previous study regarding both the cadaveric foot and the live foot, joint instability occurred in the hindfoot in simulated weight-bearing condition in patients with stage II PTTD flatfoot. The method used in this study might be applied to clinical analysis of the aetiology and evolution of PTTD flatfoot, and may inform biomechanical analyses of the effects of foot surgery in the future. Cite this article: Bone Joint Res 2013;2:255–63.
Evaluation of Bleeding Rates in Renal Transplant Patients on Therapeutic Intravenous Heparin
Authors: Ringenberg Theresa , Desanto Heather , Opsha Yekaterina , Costello Jennifer , Schiller Daryl 
Published: December 2013

Background It is unknown whether coagulation properties differ between renal transplant and nontransplant patients. Objective To assess whether renal transplant patients on intravenous (IV) heparin, titrated to therapeutic activated partial thromboplastin times (aPPT; 56-93 seconds), experienced a higher rate of bleeding compared to nontransplant patients. Methods Twenty-nine renal transplant and 29 nontransplant patients receiving IV heparin for a deep vein thrombosis, pulmonary embolism, atrial fibrillation, or acute coronary syndrome were randomly identified through a retrospective chart review. Results Renal transplant patients had higher bleeding rates on IV heparin therapy compared to nontransplant patients (31% vs 6.9%, respectively; P = .041). Renal transplant patients experienced a drop in hemoglobin of at least 1 g/dL or the need for a transfusion more often then nontransplant patients (69% vs 45%, respectively; P = .111), although the difference was not statistically significant. Conclusions Further research is necessary to identify the factors contributing to increased rates of bleeding in renal transplant patients on IV heparin and to determine the ideal aPTT to appropriately balance anticoagulation in renal transplant patients.
Interlaboratory Agreement of Insulin-like Growth Factor 1 Concentrations Measured by Mass Spectrometry
Authors: Cox Holly D , Lopes Filipe , Woldemariam Getachew A , Becker Jessica O , Parkin Mark C , Thomas Andreas , Butch Anthony W , Cowan David A , Thevis Mario , Bowers Larry D , Hoofnagle Andrew N 
Published: December 2013

Abstract

BACKGROUND
Insulin-like growth factor 1 (IGF-1)7 is a key mediator of growth hormone (GH) action and a well-characterized biomarker of GH abuse. Current immunoassays for IGF-1 suffer from poor concordance between platforms, which makes comparison of results between laboratories difficult. Although previous work has demonstrated good interlaboratory imprecision of LC-MS/MS methods when plasma is supplemented with purified proteins, the interlaboratory imprecision of an endogenous protein in the nanogram-per-milliliter concentration range has not been reported.

METHODS
We deployed an LC-MS/MS method to quantify serum IGF-1 in 5 laboratories using 5 different instruments and analyzed 130 healthy human samples and 22 samples from patients with acromegaly. We determined measurement imprecision (CV) for differences due to instrumentation, calibration curve construction, method of calibration, and reference material.

RESULTS
Instrument-dependent variation, exclusive of digestion, across 5 different instrument platforms was determined to be 5.6%. Interlaboratory variation was strongly dependent on calibration. Calibration materials from a single laboratory resulted in less variation than materials made in individual laboratories (CV 5.2% vs 12.8%, respectively). The mean imprecision for 152 samples between the 5 laboratories was 16.0% when a calibration curve was made in each laboratory and 11.1% when a single-point calibration approach was used.

CONCLUSIONS
The interlaboratory imprecision of serum IGF-1 concentrations is acceptable for use of the assay in antidoping laboratories and in standardizing results across clinical laboratories. The primary source of variability is not derived from the sample preparation but from the method of calibration.
Bladder perforation during pregnancy due to misplaced surgical clips
Authors: Eyi Elif Gül Yapar , Engin-Üstün Yaprak , Özkan Mehmet Şahin 
Published: December 2013

Abstract
Misplaced or wandering clips in endoscopic surgery have led to a variety of complications and diagnostic challenges. We describe a woman at 37 weeks of gestation, who presented to our hospital with symptoms of acute abdomen pain. Sonographic examination showed voluminous abdomino-pelvic fluid and laparotomy revealed a bladder perforation with endoclips attached to the urinary bladder fundus. The clips had been placed for hemostasis during the laparoscopic removal of an intrapelvic intrauterine device 2years earlier. We emphasize the importance of meticulous dissection, proper tissue handling and the removal of any misplaced/wandering clips during endoscopic surgery.
Electronic transport in organic memories of chitosan with gold nanoparticles
Authors: Valencia Germán Ayala , Llanos Jaiber Humberto Rodríguez , de Oliveira Vercik Luci Cristina , Vercik Andrés 
Published: December 2013

Abstract
The effect of gold nanoparticles (AuNPs) on the electronic transport in chitosan and chitosan/AuNPs films was experimentally and theoretically studied. The electronic properties (current-voltage curves) relative to the transport in the organic bulk in films were fitted to various models: space-charge limited current (SCLC), trap-charge limited current (TCLC) and scaling rule. However, it was found that the TCLC model, ITCLC(V)αVl+1 and scaling rule, I(V)α(V-VT)ξ, describes better the electronic transport in chitosan and chitosan/AuNPs films. Current-voltage (I-V) curves showed an increasing conductivity with the AuNPs concentration. In addition, a bistable behavior was observed in chitosan/AuNPs films and it was attributed to the electron capture in the AuNPs. The results reported in this paper indicate that the electronic conductivity and bistable behavior in chitosan/AuNPs films could be controlled by the AuNPs incorporation on the chitosan matrix.
Use of glass waste as mineral filler in hot mix asphalt
Authors: Saltan Mehmet , Öksüz Betül , Uz Volkan Emre 
Published: December 2013

AbstractThe use of resources is increasing due to continuous increase in world population and rapid industrialization, while natural resources are being exhausted day by day. Usage of waste materials or by-products in highway construction has substantial environmental and economic benefits. In this study, the usage of cullet and waste glass bottle dust as mineral filler material in hot mix asphalt as an alternate to traditional crushed stone dust was investigated. Optimum bitumen content was determined by the Marshall mix design method by using six different bitumen contents (4.0%, 4.5%, 5.0%, 5.5%, 6.0%, and 6.5%). With the optimum bitumen content, three different mineral filler types (cullet, glass bottle waste, and stone dust) and six different filler ratios (4%, 5%, 6%, 7%, 8%, and 9%) were used to prepare asphalt mixture samples. Samples were performed using the Marshall stability test, and the results were compared. It is concluded that cullet and glass bottle waste can be used in asphalt mixtures as a mineral filler alternate to crushed stone dust if the economic and environmental factors favor it.
Fabrication and mechanical properties of ultrafine structured dissimilar laminated metal composite sheets (LMCS)
Authors: Chen Zejun , Chen Quanzhong , Liu Qing , Zhou Zheng , Wang Guojun 
Published: December 2013

AbstractThe ultrafine grain structure is very difficult to fabricate by severe plastic deformation (SPD) for metals with poor formability. In this paper, a fabrication technology of ultrafine structured dissimilar laminated metal composite sheets (LMCS) was developed for poor plastic metals which have low elongation by hot accumulative roll bonding (ARB) in conjunction with cold rolling. The hot ARBed 1100/7075 LMCS was cold rolled at room temperature after recrystallization annealing treatment. An ultrafine structured dissimilar LMCS was obtained without undergoing severe cold rolled deformation. The mechanical properties were enhanced and optimized by using heat treatment technology. The accelerated refining mechanism of grain was revealed by microstructure characterization of the composite sheet. The enhanced strength was mainly derived from the fine layers, refined grains, increased dislocation accumulation, and abundant dispersoids. The results of the research are helpful in improving the mechanical properties of dissimilar LMCS and optimizing the preparation technology.
Investigation of Hygro-Thermal Cycle Effects on the Membranes of Proton Exchange Membrane Fuel Cells
Authors: Colak Ozgen , Acar Alperen , Ergenekon Emre 
Published: December 2013

Abstract
Nafion is the most commonly used membrane material in proton exchange membrane fuel cells. New and used membrane electrode assemblies (MEAs) are subjected to dynamic mechanical analysis (DMA) tests in temperature scan mode to determine the effect of catalyst coating and hygro-thermal aging. DMA tests are also performed using specimens obtained from the rolling and transverse directions to investigate the anisotropic effects of the membrane and the coating. The catalyst coating increases the stiffness and brittleness of the membrane. Increased stiffness is observed in used MEAs relative to new MEAs, which indicates that hygro-thermal aging increases the brittleness of the material. A slight dependence on direction—that is, anisotropy—is also determined.
Bernstein estimator for unbounded copula densities
Authors: Bouezmarni Taoufik , Ghouch El , Taamouti Abderrahim 
Published: December 2013

Abstract
Copulas are widely used for modeling the dependence structure of
multivariate data. Many methods for estimating the copula density functions are investigated. In this paper, we study the asymptotic properties of the Bernstein estimator for unbounded copula density functions.
We show that the estimator converges to infinity at the corner and we establish its relative convergence when the copula density is unbounded. Also, we provide the uniform strong consistency of the estimator on every compact in the interior region.
We investigate the finite sample performance of the estimator via an
extensive simulation study and we compare the Bernstein copula density
estimator with other nonparametric methods.
Finally, we consider an empirical application where the asymmetric dependence between international equity markets (US, Canada, UK, and France) is examined.
Genome-Wide Gene Expression Effects of Sex Chromosome Imprinting inDrosophila
Authors: Lemos Bernardo , Branco Alan T , Jiang Pan-Pan , Hartl Daniel L , Meiklejohn Colin D 
Published: December 2013

AbstractImprinting is well-documented in both plant and animal species. In Drosophila, the Y chromosome is differently modified when transmitted through the male and female germlines. Here, we report genome-wide gene expression effects resulting from reversed parent-of-origin of the X and Y chromosomes. We found that hundreds of genes are differentially expressed between adult male Drosophila melanogaster that differ in the maternal and paternal origin of the sex chromosomes. Many of the differentially regulated genes are expressed specifically in testis and midgut cells, suggesting that sex chromosome imprinting might globally impact gene expression in these tissues. In contrast, we observed much fewer Y-linked parent-of-origin effects on genome-wide gene expression in females carrying a Y chromosome, indicating that gene expression in females is less sensitive to sex chromosome parent-of-origin. Genes whose expression differs between females inheriting a maternal or paternal Y chromosome also show sex chromosome parent-of-origin effects in males, but the direction of the effects on gene expression (overexpression or underexpression) differ between the sexes. We suggest that passage of sex chromosome chromatin through male meiosis may be required for wild-type function in F1 progeny, whereas disruption of Y-chromosome function through passage in the female germline likely arises because the chromosome is not adapted to the female germline environment.
Perceptions of 24/7 In-Hospital Intensivist Coverage on Pediatric Housestaff Education
Authors: Rehder Kyle J. , Cheifetz Ira M. , Willson Douglas F. , Turner David A. 
Published: December 2013

BACKGROUND:
In recent years, the focus on patient safety and housestaff supervision has led to a steady increase in institutions providing 24/7 in-hospital (also known as in-house, henceforth referred to as IH) coverage by pediatric intensivists. Effects of this increased attending physician presence on education of pediatric housestaff have not been studied. We hypothesized that IH coverage would decrease perceived autonomy of housestaff and negatively affect their preparedness to be independent attending physicians on completion of training.

METHODS:
A secure, anonymous, Web-based survey was sent to pediatric intensivists in the United States and Canada, and pediatric critical care fellows and pediatric residents at academic centers across the United States. Questions focused on perceptions of IH coverage and housestaff educational experience.

RESULTS:
We report 1323 responses from 147 institutions (center response rate 74%). Although 96% of respondents stated that the PICU provides “a good educational experience,” only 50% of pediatric intensivists and 67% of housestaff feel that housestaff are prepared for independent practice after training in an IH model. Compared with those training in home-call models, respondents currently working in IH models have more favorable perceptions of the effects of IH coverage on housestaff autonomy (P &lt; .0001), supervision (P &lt; .0001), and preparation for independent practice (P &lt; .0001).

CONCLUSIONS:
Pediatric intensivists and housestaff express concern regarding the preparation of housestaff training in a 24/7 IH attending model. An important priority for institutions using or considering a 24/7 IH attending coverage model is the balance between adequate housestaff supervision and autonomy.
Correlation between air temperature and electricity demand by linear regression and wavelet coherence approach: UK, Slovakia and Bosnia and Herzegovina case study
Authors: Avdakovic Samir , Ademovic Alma , Nuhanovic Amir 
Published: December 2013

Abstract
In this paper, the results of correlations between air temperature and electricity demand by linear regression and Wavelet Coherence (WTC) approach for three different European countries are presented. The results show a very close relationship between air temperature and electricity demand for the selected power systems, however, the WTC approach presents interesting dynamics of correlations between air temperature and electricity demand at different time-frequency space and provide useful information for a more complete understanding of the related consumption.
SVC placement for voltage constrained loss minimization using self-adaptive Firefly algorithm
Authors: Selvarasu R. , Surya Kalavathi M. , Asir Rajan C. Christober 
Published: December 2013

Abstract
Static Var Compensator (SVC) is a popular FACTS device for providing reactive power support in power systems and its placement representing the location and size has significant influence on network loss, while keeping the voltage magnitudes within the acceptable range. This paper presents a Firefly algorithm based optimization strategy for placement of SVC in power systems with a view of minimizing the transmission loss besides keeping the voltage magnitude within the acceptable range. The method uses a self-adaptive scheme for tuning the parameters in the Firefly algorithm. The strategy is tested on three IEEE test systems and their results are presented to demonstrate its effectiveness.
Principal component analysis for functional data on grain yield of winter wheat cultivars
Authors: Krzyśko Mirosław , Derejko Adriana , Górecki Tomasz , Gacek Edward 
Published: December 2013

Summary The aim of this paper is to present a statistical methodology to assess patterns of cultivars' adaptive response to agricultural environments (agroecosystems) on the basis of complete Genotype x Crop Management x Location x Year (GxMxLxY) data obtained from 3-year multi-location twofactor trials conducted within the framework of the Polish post-registration trials (PDOiR), with an illustration of the application and usefulness of this methodology in analyzing winter wheat grain yield. Producing specific varieties for each subregion of a target region, from widely adapted varieties, may exploit positive genotype x location (GL) interactions to increase crop yields. Experiments designed to examine combinations of environment (E), management practices (M) and cultivars (G) also provide evidence of the relative importance of each of these factors for yield improvement. The evidence shows that variation due to E far outweighs the variation of grain yield that can be attributed to M or G, or the interactions between these factors, and between these factors and E (Anderson, 2010). This statistical method involves the use of functional PCA and cluster analysis. A total of 24 cultivars were evaluated over 3 years in 20 environments using randomized incomplete split-block designs with two replications per trial. The methodology proved an efficient tool for the reliable classification of 24 winter wheat cultivars, distinguishing cultivar groups that exhibited homogeneous adaptive response to environments. It enables the identification of cultivars displaying wide or specific adaptation. The remaining cultivars were locally adapted to some testing environments, or some of them were not relatively adapted to the environments because they always yielded substantially below the environmental means. Performing earlier specific selection, or adopting distinct genetic bases for each agro-ecosystem, may further increase the advantage of specific breeding.
Detection of outlying observations using the Akaike information criterion
Authors: Kornacki Andrzej 
Published: December 2013

Summary For the detection of outliers (observations which are seemingly different from the others) the method of testing hypotheses is most often used. This approach, however, depends on the level of significance adopted by the investigator. Moreover, it can lead to the undesirable effect of “masking” of the outliers. This paper presents an alternative method of outlier detection based on the Akaike information criterion. The theory presented is applied to analysis of the results of beet leaf mass determination.
Channel Characterisation and Link Budget of MIMO Configuration in Near Field Magnetic Communication
Authors: Nguyen Hoang , Agbinya Johnson I. , Devlin John 
Published: December 2013

Abstract
Traditional radio communication has gained significantly from using multiple input and multiple output (MIMO) architecture in the system. Many wireless applications, such as wireless LAN and cellular network, have adopted this technology to improve their system performance. However, the effect of MIMO systems has not been investigated in the case of inductive near field short range communications. The purpose of this paper is to explore a new method for increasing the magnetic communication range using MIMO. Three system models includingMISO, SIMO and MIMO are proposed to characterize the number of transmitters and receivers to the link. These models have helped to extend not only the range but also the communication channel in NFMIC.
Experimental Results of High-Resolution ISAR Imaging of Ground-Moving Vehicles with a Stationary FMCW Radar
Authors: Kulpa Janusz S. , Malanowski Mateusz , Gromek Damian , Samczyńsk Piotr , Kulpa Krzysztof , Gromek Artur 
Published: December 2013

Abstract
In the paper experimental results of ISAR (Inverse Synthetic Aperture Radar) processing obtained with highresolution radar are presented. Targets under observation were ground moving vehicles, such as cars, trucks and tractors. The experiments were performed with a FMCW (Frequency- Modulated Continuous-Wave) radar operating at 94 GHz with almost 1 GHz of bandwidth. Due to the measurement scenario more typical for SAR (Synthetic Aperture Radar), than ISAR, i.e. targets moving along straight line crossing the antenna beam, algorithms usually applied for SAR processing have been used.
Analysis of the Impact of the Frequency Range of the Tensometer Bridge and Projectile Geometry on the Results of Measurements by the Split Hopkinson Pressure Bar Method
Authors: Moćko Wojciech 
Published: December 2013

Abstract
The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient