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https://www.readbyqxmd.com/read/28240007/delineation-of-margins-for-the-planning-target-volume-ptv-for-image-guided-radiotherapy-igrt-of-gastric-cancer-based-on-intrafraction-motion
#1
Paulina Leszczyńska, Wojciech Leszczyński, Jerzy Wydmański, Dębiec Kinga, Agnieszka Namysł Kaletka, Andrzej Tukiendorf, Leszek Hawrylewicz
Background: Application of the image-guided radiotherapy (IGRT) system for gastric cancer involving daily verification of patient positioning on the treatment machine allows minimisation of geometrical errors as a consequence of intra- and inter-fraction motion. The purpose of this study was to define the intrafraction motion in gastric cancer patients during a treatment session based on the IGRT system and designation of margins around the clinical target volume CTV (internal target volume ITV) necessary to delineate the planning target volume (PTV)...
1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28239671/development-of-a-model-to-determine-mass-transfer-coefficient-and-oxygen-solubility-in-bioreactors
#2
Johnny Lee
The objective of this paper is to present an experimentally validated mechanistic model to predict the oxygen transfer rate coefficient (Kla) in aeration tanks for different water temperatures. Using experimental data created by Hunter and Vogelaar, the formula precisely reproduces experimental results for the standardized Kla at 20 °C, comparatively better than the current model used by ASCE 2-06 based on the equation Kla20 = Kla. ([Formula: see text])((20-T)) where T is in °C. Currently, reported values for [Formula: see text] range from 1...
February 2017: Heliyon
https://www.readbyqxmd.com/read/28239433/domain-adaptation-with-conditional-transferable-components
#3
Mingming Gong, Kun Zhang, Tongliang Liu, Dacheng Tao, Clark Glymour, Bernhard Schölkopf
Domain adaptation arises in supervised learning when the training (source domain) and test (target domain) data have different distributions. Let X and Y denote the features and target, respectively, previous work on domain adaptation mainly considers the covariate shift situation where the distribution of the features P(X) changes across domains while the conditional distribution P(Y∣X) stays the same. To reduce domain discrepancy, recent methods try to find invariant components [Formula: see text] that have similar [Formula: see text] on different domains by explicitly minimizing a distribution discrepancy measure...
June 2016: JMLR Workshop and Conference Proceedings
https://www.readbyqxmd.com/read/28239356/sex-and-exercise-intensity-do-not-influence-oxygen-uptake-kinetics-in-submaximal-swimming
#4
Joana F Reis, Gregoire P Millet, Paula M Bruno, Veronica Vleck, Francisco B Alves
The aim of this study was to compare the oxygen uptake ([Formula: see text]) kinetics in front crawl between male and female swimmers at moderate and heavy intensity. We hypothesized that the time constant for the primary phase [Formula: see text] kinetics was faster in men than in women, for both intensities. Nineteen well trained swimmers (8 females mean ± SD; age 17.9 ± 3.5 years; mass 55.2 ± 3.6 kg; height 1.66 ± 0.05 m and 11 male 21.9 ± 2.8 years; 78.2 ± 11.1 kg; 1.81 ± 0.08 m) performed a discontinuous maximal incremental test and two 600-m square wave transitions for both moderate and heavy intensities to determine the [Formula: see text] kinetics parameters using mono- and bi-exponential models, respectively...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28239345/improvements-in-orientation-and-balancing-abilities-in-response-to-one-month-of-intensive-slackline-training-a-randomized-controlled-feasibility-study
#5
Milos Dordevic, Anita Hökelmann, Patrick Müller, Kathrin Rehfeld, Notger G Müller
Background: Slackline-training has been shown to improve mainly task-specific balancing skills. Non-task specific effects were assessed for tandem stance and preferred one-leg stance on stable and perturbed force platforms with open eyes. It is unclear whether transfer effects exist for other balancing conditions and which component of the balancing ability is affected. Also, it is not known whether slackline-training can improve non-visual-dependent spatial orientation abilities, a function mainly supported by the hippocampus...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28239248/efficient-computation-of-the-joint-sample-frequency-spectra-for-multiple-populations
#6
John A Kamm, Jonathan Terhorst, Yun S Song
A wide range of studies in population genetics have employed the sample frequency spectrum (SFS), a summary statistic which describes the distribution of mutant alleles at a polymorphic site in a sample of DNA sequences and provides a highly efficient dimensional reduction of large-scale population genomic variation data. Recently, there has been much interest in analyzing the joint SFS data from multiple populations to infer parameters of complex demographic histories, including variable population sizes, population split times, migration rates, admixture proportions, and so on...
2017: Journal of Computational and Graphical Statistics
https://www.readbyqxmd.com/read/28239243/on-modified-dunkl-generalization-of-sz%C3%A3-sz-operators-via-q-calculus
#7
M Mursaleen, Md Nasiruzzaman, Abdullah Alotaibi
The purpose of this paper is to introduce a modification of q-Dunkl generalization of exponential functions. These types of operators enable better error estimation on the interval [Formula: see text] than the classical ones. We obtain some approximation results via a well-known Korovkin-type theorem and a weighted Korovkin-type theorem. Further, we obtain the rate of convergence of the operators for functions belonging to the Lipschitz class.
2017: J Inequal Appl
https://www.readbyqxmd.com/read/28239242/a-new-result-on-the-existence-of-periodic-solutions-for-li%C3%A3-nard-equations-with-a-singularity-of-repulsive-type
#8
Shiping Lu
In this paper, the problem of the existence of a periodic solution is studied for the second order differential equation with a singularity of repulsive type [Formula: see text] where [Formula: see text] is singular at [Formula: see text], φ and h are T-periodic functions. By using the continuation theorem of Manásevich and Mawhin, a new result on the existence of positive periodic solution is obtained. It is interesting that the sign of the function [Formula: see text] is allowed to change for [Formula: see text]...
2017: J Inequal Appl
https://www.readbyqxmd.com/read/28239226/temperature-and-moisture-dependent-studies-on-alunogen-and-the-crystal-structure-of-meta-alunogen-determined-from-laboratory-powder-diffraction-data
#9
Volker Kahlenberg, Doris E Braun, Hannes Krüger, Daniela Schmidmair, Maria Orlova
Starting from a synthetic sample with composition Al2(SO4)3·16.6H2O, the high-temperature- and moisture-dependent behavior of alunogen has been unraveled by TGA measurements, in situ powder X-ray diffraction as well as by gravimetric moisture sorption/desorption studies. Heating experiments using the different techniques show that alunogen undergoes a first dehydration process already starting at temperatures slightly above 40 °C. The crystalline product of the temperature-induced dehydration corresponds to the synthetic equivalent of meta-alunogen and has the following chemical composition: Al2(SO4)3·13...
2017: Physics and Chemistry of Minerals
https://www.readbyqxmd.com/read/28238437/impact-of-size-distributions-of-major-chemical-components-in-fine-particles-on-light-extinction-in-urban-guangzhou
#10
Yunjie Xia, Jun Tao, Leiming Zhang, Renjian Zhang, Shuanglin Li, Yunfei Wu, Junji Cao, Xiaojia Wang, Qingxia Ma, Zhe Xiong
To evaluate the impact of fine particulate matter (PM2.5) size distribution on aerosol chemical and optical properties, dominant chemical components including water-soluble inorganic ions (WSII), organic carbon (OC) and elemental carbon (EC) in PM1 and PM2.5, aerosol scattering coefficient (bsp), and aerosol absorption coefficient (bap) were collected synchronously at an urban site in Guangzhou, south China during a typical summer month in 2009 and a winter month in 2010. PM1 (sizes smaller than 1μm) constituted 77% and 63% of PM2...
February 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28237150/spectacle-plane-add-power-of-multifocal-intraocular-lenses-according-to-effective-lens-position
#11
Youngsub Eom, Jong Suk Song, Hyo Myung Kim
OBJECTIVE: To evaluate the accuracy of predicting the spectacle plane add power of multifocal intraocular lenses (MIOLs) based on the effective lens position (ELP) using the Haigis formula. DESIGN: Retrospective cross-sectional study. PARTICIPANTS: A total of 26 eyes from 18 consecutive patients who underwent phacoemulsification with Tecnis MIOL (Z*B00) implantation. METHODS: The postoperative spectacle plane add power of MIOLs was determined from the monocular defocus curve...
February 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28236742/spatial-coherence-of-electron-beams-from-field-emitters-and-its-effect-on-the-resolution-of-imaged-objects
#12
Tatiana Latychevskaia
Sub-nanometer and nanometer-sized tips provide high coherence electron sources. Conventionally, the effective source size is estimated from the extent of the experimental biprism interference pattern created on the detector by applying the van Cittert Zernike theorem. Previously reported experimental intensity distributions on the detector exhibit Gaussian distribution and our simulations show that this is an indication that such electron sources must be at least partially coherent. This, in turn means that strictly speaking the Van Cittert Zernike theorem cannot be applied, since it assumes an incoherent source...
November 25, 2016: Ultramicroscopy
https://www.readbyqxmd.com/read/28236708/comparative-study-on-the-occurrence-of-polycyclic-aromatic-hydrocarbons-in-breast-milk-and-infant-formula-and-risk-assessment
#13
Serena Santonicola, Alessandra De Felice, Luigi Cobellis, Nicola Passariello, Angela Peluso, Nicoletta Murru, Maria Carmela Ferrante, Raffaelina Mercogliano
The study compared the polycyclic aromatic hydrocarbons (PAH) profile of human milk collected from Italian mothers and different brands of infant formula available on Italian market. Levels of 14 PAHs most frequently occurred in food, PAH markers listed by Commission Regulation (EC) No. 1881/2006, and carcinogenic PAHs classified by the International Agency for Research on Cancer, were determined by high-pressure liquid chromatography with fluorescence detector. The average concentrations of total PAHs were 114...
February 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28236681/antibacterial-and-antioxidant-properties-of-biosynthesized-zinc-oxide-nanoparticles-from-ceropegia-candelabrum-l-an-endemic-species
#14
M Murali, C Mahendra, Nagabhushan, N Rajashekar, M S Sudarshana, K A Raveesha, K N Amruthesh
Zinc oxide nanoparticles (ZnO-NPs) were synthesized for the first time from any of the species of Ceropegia. Presently, ZnO-NPs were synthesized from the leaf extract of Ceropegia candelabrum with zinc nitrate using a simple hydrothermal process. The synthesized ZnO-NPs showed an absorption peak at 320nm which is one of the characteristic features of ZnO-NPs. The FT-IR characterization revealed a spectrum band at 551.93cm(-1) corresponding to the functional group metal oxide. SEM images showed agglomeration of nanoparticles with a hexagonal shape...
February 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28236406/lc-ms-ms-analysis-and-pharmacokinetic-study-on-five-bioactive-constituents-of-tanreqing-injection-in-rats
#15
Feng Zhang, Liang Sun, Shou-Hong Gao, Wan-Sheng Chen, Yi-Feng Chai
Tanreqing injection (TRQ), a well-known traditional Chinese medicine formula, is commonly used to treat respiratory diseases. In the present study, a rapid, selective, and sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated to simultaneously determinate the plasma contents of 5 major constituents of TRQ, including chlorogenic acid (CHA), caffeic acid (CFA), baicalin (BA), ursodeoxycholic acid (UDCA) and chenodeoxycholic acid (CDCA) in rats after intravenous administration of TRQ...
October 2016: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28236348/fixed-time-interval-compared-with-on-demand-oral-analgesia-protocols-for-post-caesarean-pain-a-randomised-controlled-trial
#16
E Yefet, H Taha, R Salim, J Hasanein, Y Carmeli, N Schwartz, Z Nachum
OBJECTIVES: To compare the efficacy, safety and satisfaction from two modes of oral analgesia administration for the treatment of post-caesarean pain in the first 48 h following surgery: on-demand versus fixed time interval administration. DESIGN: Open label parallel-group, randomised-controlled trial from February to December 2013. SETTING: University-affiliated hospital in Israel. POPULATION: Two-hundred women who underwent caesarean delivery with regional anaesthesia...
February 25, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28236318/on-the-relative-performance-of-edge-illumination-x-ray-phase-contrast-ct-and-conventional-attenuation-based-ct
#17
Charlotte Klara Hagen, Paul Claude Diemoz, Alessandro Olivo
PURPOSE: This article is aimed at comparing edge illumination (EI) x-ray phase contrast computed tomography (PCT) and conventional (attenuation-based) computed tomography (CT), based on their respective contrast and noise transfer. METHODS: The noise in raw projections obtained with EI PCT is propagated through every step of the data processing, including phase retrieval and tomographic reconstruction, leading to a description of the noise in the reconstructed phase tomograms...
February 25, 2017: Medical Physics
https://www.readbyqxmd.com/read/28236141/effects-of-age-and-location-in-chinese-relative-clauses-processing
#18
Wenguang He, Na Xu, Runqing Ji
Three experiments investigated Chinese relative clause processing with children, youths and elders using sentence-picture matching and self-paced reading methods. In Experiment 1, we found that object-extracted clause were easier to comprehend than subject-extracted clause , and object-modified relative clause (i.e., object-modified subject-extracted clause[Formula: see text]object-modified object-extracted clause) were difficult to comprehend than subject modified relative clause (subject-modified subject-extracted clause[Formula: see text]subject-modified object-extracted clause)...
February 24, 2017: Journal of Psycholinguistic Research
https://www.readbyqxmd.com/read/28236117/3d-ultrasound-registration-based-visual-servoing-for-neurosurgical-navigation
#19
Oliver Zettinig, Benjamin Frisch, Salvatore Virga, Marco Esposito, Anna Rienmüller, Bernhard Meyer, Christoph Hennersperger, Yu-Mi Ryang, Nassir Navab
PURPOSE: We present a fully image-based visual servoing framework for neurosurgical navigation and needle guidance. The proposed servo-control scheme allows for compensation of target anatomy movements, maintaining high navigational accuracy over time, and automatic needle guide alignment for accurate manual insertions. METHOD: Our system comprises a motorized 3D ultrasound (US) transducer mounted on a robotic arm and equipped with a needle guide. It continuously registers US sweeps in real time with a pre-interventional plan based on CT or MR images and annotations...
February 24, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28236113/active-brownian-particles-moving-in-a-random-lorentz-gas
#20
Maria Zeitz, Katrin Wolff, Holger Stark
Biological microswimmers often inhabit a porous or crowded environment such as soil. In order to understand how such a complex environment influences their spreading, we numerically study non-interacting active Brownian particles (ABPs) in a two-dimensional random Lorentz gas. Close to the percolation transition in the Lorentz gas, they perform the same subdiffusive motion as ballistic and diffusive particles. However, due to their persistent motion they reach their long-time dynamics faster than passive particles and also show superdiffusive motion at intermediate times...
February 2017: European Physical Journal. E, Soft Matter
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