bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exercise-Induced Pulmonary Artery Hypertension in a Patient with Compensated Cardiac Disease: Hemodynamic and Functional Response to Sildenafil Therapy
Authors: Nikolaidis Lazaros , Memon Nabeel , O'Murchu Brian 
Published: February 2015

We describe the case of a 54-year-old man who presented with exertional dyspnea and fatigue that had worsened over the preceding 2 years, despite a normally functioning bioprosthetic aortic valve and stable, mild left ventricular dysfunction (left ventricular ejection fraction, 0.45). His symptoms could not be explained by physical examination, an extensive biochemical profile, or multiple cardiac and pulmonary investigations.
However, abnormal cardiopulmonary exercise test results and a right heart catheterization—combined with the use of a symptom-limited, bedside bicycle ergometer—revealed that the patient's exercise-induced pulmonary artery hypertension was out of proportion to his compensated left heart disease. A trial of sildenafil therapy resulted in objective improvements in hemodynamic values and functional class.
Hemodynamic Evaluation of Suspected Severe Aortic Stenosis Leads to a Diagnosis of Renal Cell Carcinoma
Authors: Lake Mikhailia , Tanawuttiwat Tanyanan , Bilsker Martin , De Marchena Eduardo 
Published: February 2015

The evaluation of aortic stenosis is not always straightforward. When symptoms of severe aortic stenosis are present with supporting Doppler echocardiographic or cardiac catheterization data, replacement of the aortic valve is recommended. Occasionally, Doppler- and catheter-derived data are discordant; appropriate treatment in such cases becomes less clear.
We report a case in which a 66-year-old man's symptoms and Doppler data suggested severe aortic stenosis. However, heart catheterization data suggested otherwise, and ultimately it led to the diagnosis of a highly vascular renal tumor. Shunting within the tumor resulted in high cardiac output, which, in combination with a small aortic root, masqueraded as severe aortic stenosis.
Restoration of Renal Allograft Function via Reduced-Contrast Percutaneous Revascularization of Transplant Renal Artery Stenosis
Authors: Erwin Phillip A. , Goel Sachin S. , Gebreselassie Surafel , Shishehbor Mehdi H. 
Published: February 2015

Transplant renal artery stenosis (TRAS), the most common vascular complication of kidney transplantation, can lead to heart failure, uncontrolled hypertension, and irreversible dysfunction of the transplanted kidney. Percutaneous revascularization can improve outcomes in well-selected patients with symptomatic TRAS, but the intervention itself poses risk to the transplanted kidney because of the quantities of nephrotoxic contrast solution that often are used.
We report the case of a patient with TRAS who, 5 months after undergoing a kidney transplant, developed allograft dysfunction and heart failure that required hemodialysis. We performed angioplasty and stenting of the TRAS, using intravascular ultrasonography and fluoroscopy as our primary imaging methods. To minimize further damage to a potentially viable kidney, the volume of intravascular contrast medium used was trivial (a total of 9 cc). Revascularization of the patient's TRAS restored his renal function: within 4 weeks of the procedure, he no longer needed hemodialysis, and his heart failure symptoms had resolved. This case emphasizes the value of early definitive treatment of TRAS and the usefulness of intravascular ultrasonography to minimize the amount of contrast medium used in endovascular procedures.
Innovative Chimney-Graft Technique for Endovascular Repair of a Pararenal Abdominal Aortic Aneurysm
Authors: Galiñanes Edgar Luis , Hernandez-Vila Eduardo A. , Krajcer Zvonimir 
Published: February 2015

After abdominal aortic aneurysm repair, progressive degeneration of the aneurysm can be challenging to treat. Multiple comorbidities and previous operations place such patients at high risk for repeat surgery. Endovascular repair is a possible alternative; however, challenging anatomy can push the limits of available technology.
We describe the case of a 71-year-old man who presented with a 5.3-cm pararenal aneurysm 4 years after undergoing open abdominal aortic aneurysm repair. To avoid reoperation, we excluded the aneurysm by endovascular means, using visceral-artery stenting, a chimney-graft technique. Low-profile balloons on a monorail system enabled the rapid exchange of coronary wires via a buddy-wire technique. This novel approach facilitated stenting and simultaneous angioplasty of multiple visceral vessels and the abdominal aorta.
Gain Improvement of Microstrip Patch Antenna Using CLS Split Ring Resonator Metamaterial
Authors: Katiyar Pankaj Rameshchandra , Wan Mahadi Wan Nor Liza Binti 
Published: February 2015

AbstractMetamaterials are artificial materials with negative permittivity and permeability. Metamaterials due to their unique negative parameter are capable of focusing the electromagnetic energy incident upon them. This focusing of electromagnetic energy is used to increase the gain of microstrip patch antenna. A capacitive loaded strip (CLS)-loaded split ring resonator is used to form a multilayer array of metamaterial and used in front of microstrip patch antenna to enhance far-field gain of antenna. An accurate simulation model is created and analyzed using CST. The simulated model is then fabricated and measured in fully anechoic chamber for validation. The far-field gain of regular patch antenna with and without metamaterial is measured in anechoic chamber. The increase in gain by 4 dB is measured at 95 mm from antenna. The beam focusing property is also evident from 3 dB beamwidth of antenna which is reduced to 42.01°.
Time–Frequency Distribution Analyses of Ku-Band Radar Doppler Echo Signals
Authors: Bujaković Dimitrije , Andrić Milenko , Bondžulić Boban , Mitrović Srđan , Simić Slobodan 
Published: February 2015

AbstractReal radar echo signals of a pedestrian, vehicle and group of helicopters are analyzed in order to maximize signal energy around central Doppler frequency in time–frequency plane. An optimization, preserving this concentration, is suggested based on three well-known concentration measures. Various window functions and time–frequency distributions were optimization inputs. Conducted experiments on an analytic and three real signals have shown that energy concentration significantly depends on used time–frequency distribution and window function, for all three used criteria.
Comparison and Validation of Operational Cost in Smart Houses with the Introduction of a Heat Pump or a Gas Engine
Authors: Shimoji Tsubasa , Tahara Hayato , Matayoshi Hidehito , Yona Atsushi , Senjyu Tomonobu 
Published: February 2015

Abstract
Due to the concerns of global warming and the depletion of energy resources, renewable energies such as wind generation (WG) and photovoltaic generation (PV) are gaining attention in distribution systems. Efficient electric equipment such as heat pumps (HP) not only contribute low levels of carbon to society, but are also beneficial for consumers. In addition, gas instruments such as the gas engine (GE) and fuel cells (FC) are expected to reduce electricity cost by exhaust heat. Thus, it is important to clarify which systems (HP or GE) are more beneficial for consumers throughout the year. This paper compares the operational cost for the smart house between using the HP and the GE. Current electricity and gas prices are used to calculate the cost of the smart house. The system considered in this research comprises a PV, battery, solar collector (SC), uncontrolled load and either an HP or a GE. In order to verify the effectiveness of the proposed system, MATLAB is used for simulations.
Dynamically Induced Magnetic Moment of a Magnetic Dipole System
Authors: Shutyǐ Anatoliy Michailovich 
Published: February 2015

Abstract
The systems of three and four spherical bodies with the dipole magnetic moment have been investigated using a numerical analysis. It was shown that in the initial state with the zero total magnetic moment under the influence of the alternating magnetic field, various regimes of the induced magnetic moment including quasistatic states are established. Revealed are the significant differences between these regimes related to different systems. The magnitude and direction of the magnetic moment of the system, as well the states of dynamic bistability, have been investigated. The possibilities of the induced magnetic moment control due to the changes in amplitude or frequency of the alternating field have been considered.
Asymptotically Static Universe Dominated by Phantom Energy
Authors: El-Nabulsi Rami Ahmad 
Published: February 2015

Abstract
In this article, we investigated a generalised scalar field cosmology characterised by a time-dependent coupling function, a time-dependent cosmological constant, a chameleonic field, and a time-dependent equation of state parameter. Based on a particular choice of the Hubble parameter as function of the scalar field and its time derivative, we have investigated the dynamics of the Friedmann–Robertson–Walker flat universe. We have observed that for a particular choice of the free parameters in the theory, the universe accelerates with time and asymptotically tends toward a static universe. For specific values of the free parameters, the asymptotically static universe may be dominated by phantom energy or a cosmological constant without the need to implement in the theory multiple scalar fields or additional interactions. It is also pointed out that an asymptotically static universe is as well one special class of solutions for Horndeski and generalised galileons cosmologies. Special properties and features are discussed accordingly.
Electron g-Factor in Diluted Magnetic Semiconductor Quantum Well with Parabolic Potential in the Presence of Rashba Effect and Magnetic Field
Authors: Babanlı Arif M. , Artunç Ekrem , Kasalak Turgut F. 
Published: February 2015

Abstract
We have studied the Rashba spin-orbital effect on a diluted magnetic semiconductor (DMS) quantum well with parabolic potential in the presence of a magnetic field parallel to the z axis, taking into account the Zeeman coupling and the s-d exchange interaction between the carriers and the magnetic ions. We have obtained an analytical expression for the electron energy spectrum, which depends on the magnetic ion concentration, temperature, and strength of magnetic field. By using the obtained energy spectrum, we calculated the electron effective g*-factor. We have found that effective g*-factor increases when the magnetic field increases; by increasing the strength of spin-orbit interaction, the electron g*-factor decreases and by increasing the temperature, the electron g*-factor increases.
Simulation of Ferrofluid Flow for Magnetic Drug Targeting Using the Lattice Boltzmann Method
Authors: Kandelousi Mohsen Sheikholeslami , Ellahi Rahmat 
Published: February 2015

Abstract
Influence of a spatially varying magnetic field on Fe3O4-plasma nanofluid flow in a vessel as a targeted drug delivery system is investigated. Combined effects of ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD) are considered in mathematic models. The lattice Boltzmann method is applied to solve the governing equations. Effects of active parameters, such as the Reynolds number and magnetic number on the flow characteristics, have been examined. Results indicate that the presence of the magnetic field affects considerably the flow field. Back flow occurs near the region where the magnetic source is located. Also, it can be found that the skin friction coefficient is a decreasing function of the Reynolds number and magnetic number.
Exhumation constraints for the lower Nevado-Filabride Complex (Betic Cordillera, SE Spain): a Raman thermometry and Tweequ multiequilibrium thermobarometry approach
Authors: Augier Romain , Booth-Rea Guillermo , Agard Phillipe , Martínez-Martínez José Miguel , Jolivet Laurent , Azañón José Miguel 
Published: February 2015

AbstractThe HP/LT rocks of the Nevado-Filabride complex (eastern Betic Cordillera) were exhumed during the Serravallian but knowledge of their retrograde P-T evolution remains fragmentary and not established for all its tectonic units. The present paper places detailed constraints on the P-T evolution of the two deeper units of the Nevado-Filabride complex, namely the Ragua and the Calar Alto units in order to constrain their exhumation and the role of the km-thick Dos Picos shear zone separating them. Our approach uses both TWEEQU software multiequilibrium thermobarometry and Raman spectrometry thermometry. The study enables to [i] estimate the peak-temperature P-T conditions (c. 520°C) and then to establish the first P-T path of the Ragua unit, [ii] conclude that the Ragua and the Calar Alto units suffered comparable metamorphic evolutions with [iii] a well constrained HT excursion following a strong decompression characterised by limited heating. The study also enables to infer that the major Dos Picos shear zone was a post-metamorphic thrust occurring during the final retrogression stages. These results point to exhumation processes intermediate between those of syn– and post– orogenic contexts during the late evolution of the Betics.
Dental microwear of the late Miocene bovids of northern Greece: Vallesian/Turolian environmental changes and disappearance of Ouranopithecus macedoniensis?
Authors: Merceron Gildas , Bonis Louis de , Viriot Laurent , Blondel Cécile 
Published: February 2015

Abstract
This study deals with the paleoenvironmental changes in northern Greece during the late Vallesian and the early Turolian, before and after the last occurrence of the hominoid Ouranopithecus macedoniensis. Dental microwear of fossil bovids yields information on paleodiet; thus, inferences can be drawn about floristic composition and paleoenvironmental changes. The microwear pattern of the fossil species is compared with that of extant species from the database “Ungulates” (20 extant species and 471 wild-shot specimens) in a multivariate analysis. The bovids of the late Vallesian “Ravin de la Pluie” locality show a dental microwear pattern similar to that of the extant grazers. This attests to the presence of open landscapes with an important grassy herbaceous layer in northern Greece during the late Vallesian. The bovids from the early Turolian also grazed. Nevertheless, Tragoportax rugosifrons, which constitutes the largest sample from the Turolian “Ravin des Zouaves 5” locality, was a mixed feeder. These dietary adaptations indicate an environment of bushy and/or wooded areas with a grassy herbaceous layer. The abundance of the mixed feeders in the ungulate assemblage of this latter locality also points out strong seasonal fluctuations in food availabilities.
Improving the Ensemble-Optimization Method Through Covariance-Matrix Adaptation
Authors: Fonseca R.M.. M. , Leeuwenburgh O.. , Van den Hof P.M.J.. M.J. , Jansen J.D.. D. 
Published: February 2015

Summary
Ensemble optimization (referred to throughout the remainder of the paper as EnOpt) is a rapidly emerging method for reservoir-model-based production optimization. EnOpt uses an ensemble of controls to approximate the gradient of the objective function with respect to the controls. Current implementations of EnOpt use a Gaussian ensemble of control perturbations with a constant covariance matrix, and thus a constant perturbation size, during the entire optimization process. The covariance-matrix-adaptation evolutionary strategy is a gradient-free optimization method developed in the “machine learning” community, which also uses an ensemble of controls, but with a covariance matrix that is continually updated during the optimization process. It was shown to be an efficient method for several difficult but small-dimensional optimization problems and was recently applied in the petroleum industry for well location and production optimization. In this study, we investigate the scope to improve the computational efficiency of EnOpt through the use of covariance-matrix adaptation (referred to throughout the remainder of the paper as CMA-EnOpt). The resulting method is applied to the waterflooding optimization of a small multilayer test model and a modified version of the Brugge benchmark model. The controls used are inflow-control-valve settings at predefined time intervals for injectors and producers with undiscounted net present value as the objective function. We compare EnOpt and CMA-EnOpt starting from identical covariance matrices. For the small model, we achieve only slightly higher (0.7 to 1.8%) objective-function values and modest speedups with CMA-EnOpt compared with EnOpt. Significantly higher objective-function values (10%) are obtained for the modified Brugge model. The possibility to adapt the covariance matrix, and thus the perturbation size, during the optimization allows for the use of relatively large perturbations initially, for fast exploration of the control space, and small perturbations later, for more-precise gradients near the optimum. Moreover, the results demonstrate that a major benefit of CMA-EnOpt is its robustness with respect to the initial choice of the covariance matrix. A poor choice of the initial matrix can be detrimental to EnOpt, whereas the CMA-EnOpt performance is near-independent of the initial choice and produces higher objective-function values at no additional computational cost.
Risk of Complications in Spine Surgery: A Prospective Study
Authors: Reis Rodolfo Casimiro , Oliveira Matheus Fernandes de , Rotta José Marcus , Botelho Ricardo Vieira 
Published: February 2015

Purpose :
Complications are the chief concern of patients and physicians when considering spine surgery. The authors seek to assess the incidence of complications in patients undergoing spine surgery and identify risk factors for their occurrence.

Methods :
Prospective study of patients undergoing spine surgery from 1 February 2013 to 1 February 2014. Epidemiological characteristics and complications during the surgical hospitalization were recorded and analyzed.

Results :
The sample comprised 95 patients (mean age, 59 years). Overall, 23% of patients were obese (BMI =30). The mean BMI was 25.9. Approximately 53% of patients had comorbidities. Complications occurred in 23% of cases; surgical site infections were the most common (9%). There were no significant differences between patients who did and did not develop complications in terms of age (60.6 vs 59.9 years, p = 0.71), sex (56% female vs 54% female, p = 0.59), BMI (26.6 vs 27.2, p = 0.40), or presence of comorbidities (52% vs 52.8%, p = 0.87). The risk of complications was higher among patients submitted to spine instrumentation than those submitted to non-instrumented surgery (33% vs 22%), p=0.8.

Conclusion :
Just over one-quarter of patients in the sample developed complications. In this study, age, BMI, comorbidities were not associated with increased risk of complications after spine surgery. The use of instrumentation increased the absolute risk of complications.
Physician as an Infective Vector at a Department of Surgery
Authors: Paduszyńska Katarzyna , Rucińska Ludmiła Gags Monika , Pomorski Lech 
Published: February 2015

AbstractThis study was designed to assess the degree of risk of bacterial transmission from physician to patient through hands, equipment and enclosing surfaces (shoe soles).The study was conducted in the Clinical Department of General and Oncological Surgery UM in Łódź. In days 16.10.2013, 17.10.2013, 18.10.2013 there were done swabs from hands, stethoscopes and soles of shoes from the same group of physicians before and after doctor's rounds. The presence of alert-pathogens in swabs was regarded as positive result.Isolates included mostly aerobic saprophytic bacilli and Staphylococcus species coagulase-negative. There were detected a singly cases of Acinetobacter Baumani and Escherichia coli. Alert-pathogens were found in 4 (16%) swabs taken from hand before doctor's rounds and in 7 (28%) swabs taken after rounds. Stetoscopes were contaminated by alert-pathogens in 3 (12%) cases before doctor's rounds and in 3 (12%) cases taken after doctor's rounds. Soles of shoes were contaminated by alert-pathogens in 14 (56%) cases taken before and 16 (65%) cases taken after doctor's rounds.1. Physicians are important factor of bacterial transmission in hospital. 2. Hands, stetoscopes and particularly soles of shoes of medical staff is the source of infection.
The Role of Apolipoprotein (A) In Pathogenesis and Clinical Course of Deep Venous Thrombosis
Authors: Chrapko Marek , Skwarzyński Adam , Karakuła Wacław , Zubilewicz Tomasz 
Published: February 2015

AbstractDeep venous thrombosis is widespread disease, which complications, like: pulmonary embolism and postphlebitis syndrome areimportant social problem. There are many well-known and accurately described risk factors, though in many cases etiology remains unexplained. Further research into causes of deep venous thrombosis seem to be fully justified.was the evaluation of the influence of apolipoprotein (a) serum level in patients with deep venous thrombosis and the changes of its concentration during the treatment.26 patients with newly diagnosed deep venous thrombosis (DVT) were enrolled to the study. Diagnosis of DVT was established by use of physical examination and duplex Doppler. Measurements of apolipoprotein (a) and D-dimers serum level were recorded on the following days, starting from the day of the initial diagnosis: 1, 7, 14 and 84.Statistically significant increase of the level of serum apolipoprotein (a) has been found during properly conducted treatment.Alterations of the concentration of serum apoliprotein (a) during the deep venous thrombosis treatment, indicates the involvement of apolipoprotein (a) in pathogenesis of deep venous thrombosis.
Two Sample Sputum Microscopy and Revised Tuberculosis Case Definition by WHO: Bangladesh Perspective
Authors: Dewan Gourab 
Published: February 2015

INTRODUCTION: Three samples of sputum (Spot-Morning-Spot) used for screening patients with suspected pulmonary tuberculosis in Bangladesh. At least two positive samples required for case definition. Cases with single positive smear require additional chest x-ray or culture. The study was done to evaluate utility of two sputum samples for case detection and whether adoption of new case definition (requiring single positive sample) recommended by World Health Organization adds advantage over current case definition for diagnosing smear positive pulmonary tuberculosis. MATERIAL AND METHODS: Retrospective analysis of sputum positive pulmonary tuberculosis cases taken from two separate hospitals in southeast Bangladesh. Frequency, pattern and increment of smear positivity noted in each samples. Smear positive cases reevaluated using proposed case definition and compared with current national definition. RESULTS: Sputum positivity for first, second and third samples was 71.6%, 99.0% and 97.3% respectively (n=408). Incremental new case detection rate was 71.6%. 28.1% and 0.2% in same order. Morning sputum had the highest sensitivity for case detection (99.0%). Incremental new case detection from third sample was negligible and using current case definition of sputum positive tuberculosis in three samples left some inconclusive cases requiring further x- ray or culture for diagnosis pending decision further. Adoption of new case definition reduces number of inconclusive cases and diagnostic delay. CONCLUSION: Two sputum samples adequate for screening of tuberculosis suspects. Adopting new case definition will reduce number of cases left inconclusive with microscopy alone (using current case definition). This will strengthen role of microscopy in tuberculosis detection in low resource setting.DOI: http://dx.doi.org/10.3126/jucms.v2i4.12034 Journal of Universal College of Medical Sciences (2014) Vol.02 No.04 Issue 08Page: 1-6