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László Andrássy, Izabella Gomez, Ágnes Horváth, Katalin Gulyás, Zsófia Pethö, Balázs Juhász, Harjit Pal Bhattoa, Zoltan Szekanecz
Bone may be similar to geological formulations in many ways. Therefore, it may be logical to apply laser-based geological techniques in bone research. The mineral and element oxide composition of bioapatite can be estimated by mathematical models. Laser-induced plasma spectrometry (LIPS) has long been used in geology. This method may provide a possibility to determine the composition and concentration of element oxides forming the inorganic part of bones. In this study, we wished to standardize the LIPS technique and use mathematical calculations and models in order to determine CaO distribution and bone homogeneity using bovine shin bone samples...
February 17, 2018: Lasers in Medical Science
Han Gyeol Park, Tae Jung Kim, Farman Ullah, Van Long Le, Hoang Tung Nguyen, Yong Soo Kim, Young Dong Kim
The dielectric function [Formula: see text] of monolayer molybdenum diselenide (MoSe 2 ) is obtained and analyzed at temperatures from 31 to 300 K and at energies from 0.74 to 6.42 eV. The sample is a large-area, partially discontinuous monolayer (submonolayer) film of MoSe 2 grown on a sapphire substrate by selenization of pulsed laser deposited MoO 3 film. Morphological and optical characterizations verified the excellent quality of the film. The MoSe 2 data were analyzed using the effective medium approximation, which treats the film and bare substrate regions as a single layer...
February 16, 2018: Scientific Reports
Seher Ünver, Fatma Nesrin Turan
OBJECTIVES: This study aimed to develop a Turkish version of the Fear of Pain Questionnaire-III developed by McNeil and Rainwater (1998) and examine its validity and reliability indicators. METHODS: The study was conducted with 459 university students studying in the nursing department. The Turkish translation of the scale was conducted by language experts and the original scale owner. Expert opinions were taken for language validity, and the Lawshe's content validity ratio formula was used to calculate the content validity...
January 2018: Aǧrı: Ağrı (Algoloji) Derneği'nin Yayın Organıdır, the Journal of the Turkish Society of Algology
Mingue Kim, Youngsub Eom, Hwa Lee, Young-Woo Suh, Jong Suk Song, Hyo Myung Kim
Purpose: To evaluate the accuracy of IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio. Methods: Nine hundred twenty-eight eyes from 928 reference subjects and 158 eyes from 158 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the fictitious refractive index that was obtained from the geometric mean posterior/anterior corneal curvature radii ratio of reference subjects and adjusted anterior and predicted posterior corneal curvature radii from conventional keratometry (K) using the posterior/anterior corneal curvature radii ratio...
February 1, 2018: Investigative Ophthalmology & Visual Science
P Bhavani, A Manikandan, Saravana Kumar Jaganathan, S Shankar, S Arul Antony
Undoped and Mn2+ doped CoAl2O4 (MnxCo1-xAl2O4; x = 0.0 to 1.0) spinel nanoparticles were successfully synthesized by a microwave heating method using glycine as the fuel. X-ray powder diffraction (XRD) was confirmed the cubic spinel structure. The average crystallite size of the samples was found to be in the range of 16.46 nm to 20.25 nm calculated by Scherrer's formula. The nano-sized particle-like morphology of the samples was confirmed by high resolution scanning electron microscopy (HR-SEM) and transmission electron microscopy (HR-TEM) analysis...
February 1, 2018: Journal of Nanoscience and Nanotechnology
S Suguna, S Shankar, Saravana Kumar Jaganathan, Ayyar Manikandan
Ni-doped cobalt aluminate NixCo1-xAl2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) spinel nanoparticles were successfully synthesized by a simple microwave combustion method using urea as the fuel and as well as reducing agent. X-ray powder diffraction (XRD) was confirmed the formation of single phase, cubic spinel cobalt-nickel aluminate structure without any other impurities. Average crystallite sizes of the samples were found to be in the range of 18.93 nm to 21.47 nm by Scherrer's formula. Fourier transform infrared (FT-IR) spectral analysis was confirmed the corresponding functional groups of the M-O, Al-O and M-Al-O (M = Co and Ni) bonds of spinel NixCo1-xAl2O4 structure...
February 1, 2018: Journal of Nanoscience and Nanotechnology
V P Shkilev
In this paper, subordinated stochastic processes are considered, where the renewal process acting as the operational time. It is assumed that the observation of the process begins at a certain time after the start of the renewal process. A recurrence formula was derived for calculating the multipoint probability density functions of the aged renewal process. Two-point correlation functions for certain subordinated stochastic processes, particularly for the generalized Ornstein-Uhlenbeck process, were calculated...
January 2018: Physical Review. E
Roman Krčmár, Ladislav Šamaj
The partition function of the symmetric (zero electric field) eight-vertex model on a square lattice can be formulated either in the original "electric" vertex format or in an equivalent "magnetic" Ising-spin format. In this paper, both electric and magnetic versions of the model are studied numerically by using the corner transfer matrix renormalization-group method which provides reliable data. The emphasis is put on the calculation of four specific critical exponents, related by two scaling relations, and of the central charge...
January 2018: Physical Review. E
Luke K Webb, Emma K Inness, Paul H Charles
This paper examines the difference in patient specific dosimetry using three different detectors of varying active volume, density and composition, for quality assurance of stereotactic treatments. A PTW 60017 unshielded electron diode, an Exradin W1 scintillator, and a PTW 31014 PinPoint small volume ionisation chamber were setup in a Lucy 3D QA phantom, and were positioned at the isocentre of an Elekta Axesse, with beam modulator collimator, using Exactrac and a HexaPODTM couch. Dose measurements were acquired for 43 stereotactic arcs, and compared to BrainLAB iPlan version 3...
February 14, 2018: Australasian Physical & Engineering Sciences in Medicine
Nashat Faried, Ahmed Morsy, Aya M Hussein
In 1960, Dvoretzky proved that in any infinite dimensional Banach space X and for any [Formula: see text] there exists a subspace L of X of arbitrary large dimension ϵ -iometric to Euclidean space. A main tool in proving this deep result was some results concerning asphericity of convex bodies. In this work, we introduce a simple technique and rigorous formulas to facilitate calculating the asphericity for each set that has a nonempty boundary set with respect to the flat space generated by it. We also give a formula to determine the center and the radius of the smallest ball containing a nonempty nonsingleton set K in a linear normed space, and the center and the radius of the largest ball contained in it provided that K has a nonempty boundary set with respect to the flat space generated by it...
2018: Journal of Inequalities and Applications
Chuan Wu, Huafeng Ding, Lei Han
Coalbed methane (CBM) is one kind of clean-burning gas and has been valued as a new form of energy that will be used widely in the near future. When producing CBM, the working level within a CBM wellbore annulus needs to be monitored to dynamically adjust the gas drainage and extraction processes. However, the existing method of measuring the working level does not meet the needs of accurate adjustment, so we designed a new sensor for this purpose. The principle of our sensor is a liquid pressure formula, i...
February 14, 2018: Sensors
Patawut Bovonratwet, Daniel D Bohl, Glenn S Russo, Nathaniel T Ondeck, Denis Nam, Craig J Della Valle, Jonathan N Grauer
BACKGROUND: Patients with geriatric hip fractures may be at increased risk for postoperative Clostridium difficile colitis, which can cause severe morbidity and can influence hospital quality metrics. However, to our knowledge, no large database study has calculated the incidence of, factors associated with, and effect of C. difficile colitis on geriatric patients undergoing hip fracture surgery. QUESTIONS/PURPOSES: To use a large national database with in-hospital and postdischarge data (National Surgical Quality Improvement Program [NSQIP®]) to (1) determine the incidence and timing of C...
March 2018: Clinical Orthopaedics and related Research
Adam Mielnik-Pyszczorski, Krzysztof Gawarecki, Paweł Machnikowski
Effective mass equations are the simplest models of carrier states in a semiconductor structures that reduce the complexity of a solid-state system to Schrödinger- or Pauli-like equations resempling those well known from quantum mechanics textbooks. Here we present a systematic derivation of a conduction-band effective mass equation for a self-assembled semiconductor quantum dot in a magnetic field from the 8-band k · p theory. The derivation allows us to classify various forms of the effective mass equations in terms of a hierarchy of approximations...
February 13, 2018: Scientific Reports
Tianjiao Tang, Linna Wu, Ling Yang, Jiaojiao Jiang, Qiukui Hao, Birong Dong, Ming Yang
The aim of this study is to investigate the validation of a sarcopenia screening test (Ishii's formula) for predicting long-term mortality among older adult inpatients. A prospective, observational study was conducted in acute geriatric wards at three hospitals in western China. Sarcopenia was estimated using Ishii's formula. Survival status was assessed at 12, 24, and 36 months after the baseline investigation. Cox proportional-hazard models were applied to calculate the hazard ratio for mortality associated with sarcopenia...
February 13, 2018: Scientific Reports
Weijun Jian, Yang Shen, Yingjun Chen, Mi Tian, Xingtao Zhou
BACKGROUND: Adolescent KC is a special segment of the general KC population because an adolescents's eyes are still susceptible to blurred vision and optical defocus during the sensitive period of ocular and visual development. In the present study, we evaluated the ocular dimensions of 53 KC adolescents. METHODS: One hundred and six KC eyes of 53 (42 boys and 11 girls) KC adolescents (age 15.5 ± 1.7 years, range 11 to 18) were involved in this retrospective study...
February 13, 2018: BMC Ophthalmology
Hsing-Hao Ho, Ya-Hui Li, Jih-Chin Lee, Chih-Wei Wang, Yi-Lin Yu, Dueng-Yuan Hueng, Hsin-I Ma, Hsian-He Hsu, Chun-Jung Juan
PURPOSE: We estimated the volume of vestibular schwannomas by an ice cream cone formula using thin-sliced magnetic resonance images (MRI) and compared the estimation accuracy among different estimating formulas and between different models. METHODS: The study was approved by a local institutional review board. A total of 100 patients with vestibular schwannomas examined by MRI between January 2011 and November 2015 were enrolled retrospectively. Informed consent was waived...
2018: PloS One
Se Uk Lee, Jae Yun Jung, Do Kyun Kim, Young Ho Kwak, Hyuksool Kwon, Jun Hwi Cho, Joong Wan Park, Yoo Jin Choi
INTRODUCTION: The purpose of this study was to construct a prediction model for endotracheal tube depth using neck CT images. METHODS: A retrospective image review was conducted that included patients who had undergone neck CT. Using sagittal neck CT images, we calculated the length between upper incisor and mid-trachea and then derived the model via regression analysis. The model was validated externally using chest radiographs of patients who had undergone endotracheal intubation...
February 6, 2018: Emergency Medicine Journal: EMJ
Maryam Papie, Sean Kitson, Luigi Mansi, Hariprasad Gali, Mohsen Cheki
Para-18F-fluorohippurate (18F-PFH) and ortho-124I-iodohippurate (124I-OIH) were recently identified as potential radiotracers suitable for conducting renography using positron emission tomography (PET). The aim of this work was to estimate preliminary human-equivalent internal radiation dose of 18F-PFH and 124I-OIH using the biodistribution data reported in healthy rats. The results were compared with the absorbed dose data of technetium-99m-mercaptoacetyltriglycine (99mTc-MAG3) as documented in the International Commission on Radiological Protection (ICRP) publication 80...
February 12, 2018: Current Radiopharmaceuticals
Mangesh I Chaudhari, Ajay Muralidharan, Lawrence R Pratt, Susan B Rempe
Progress in understanding liquid ethylene carbonate (EC) and propylene carbonate (PC) on the basis of molecular simulation, emphasizing simple models of interatomic forces, is reviewed. Results on the bulk liquids are examined from the perspective of anticipated applications to materials for electrical energy storage devices. Preliminary results on electrochemical double-layer capacitors based on carbon nanotube forests and on model solid-electrolyte interphase (SEI) layers of lithium ion batteries are considered as examples...
February 12, 2018: Topics in Current Chemistry (Journal)
David G Calatayud, Haobo Ge, Navaratnarajah Kuganathan, Vincenzo Mirabello, Robert M J Jacobs, Nicholas H Rees, Craig T Stoppiello, Andrei N Khlobystov, Rex M Tyrrell, Enrico Da Como, Sofia I Pascu
The encapsulation of CdSe nanocrystals within single-walled carbon nanotube (SWNT) cavities of varying dimensions at elevated temperatures under strictly air-tight conditions is described for the first time. The structures of CdSe nanocrystals under confinement inside SWNTs was established in a comprehensive study, combining both experimental and DFT theoretical investigations. The calculated binding energies show that all considered polymorphs [(3:3), (4:4), and (4:2)] may be obtained experimentally. The most thermodynamically stable structure (3:3) is directly compared to the experimentally observed CdSe structures inside carbon nanotubes...
February 2018: ChemistryOpen
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