keyword
MENU ▼
Read by QxMD icon Read
search

Peek

keyword
https://www.readbyqxmd.com/read/28335270/review-of-recent-developments-on-using-an-off-lattice-monte-carlo-approach-to-predict-the-effective-thermal-conductivity-of-composite-systems-with-complex-structures
#1
REVIEW
Feng Gong, Hai M Duong, Dimitrios V Papavassiliou
Here, we present a review of recent developments for an off-lattice Monte Carlo approach used to investigate the thermal transport properties of multiphase composites with complex structure. The thermal energy was quantified by a large number of randomly moving thermal walkers. Different modes of heat conduction were modeled in appropriate ways. The diffusive heat conduction in the polymer matrix was modeled with random Brownian motion of thermal walkers within the polymer, and the ballistic heat transfer within the carbon nanotubes (CNTs) was modeled by assigning infinite speed of thermal walkers in the CNTs...
July 30, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334320/interbody-spacer-material-properties-and-design-conformity-for-reducing-subsidence-during-lumbar-interbody-fusion
#2
Lillian S Chatham, Vikas V Patel, Christopher M Yakacki, R Dana Carpenter
One major complication with lumbar spinal fusion surgery is subsidence, in which the interbody spacer penetrates the vertebral endplates. Towards reducing the risk of subsidence, the objective of this study was to investigate the effects of interbody spacer material and design on the stress in the lumbar spine after interbody fusion. A finite element model of the L4-L5 motion segment was developed from computed tomography images of a cadaveric lumbar spine. A spacer, pedicle screws, and posterior rods were incorporated into the model, and the system was loaded under axial compression...
March 23, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28333113/silane-modified-diopside-for-improved-interfacial-adhesion-and-bioactivity-of-composite-scaffolds
#3
Cijun Shuai, Chenying Shuai, Pei Feng, Youwen Yang, Yong Xu, Tian Qin, Sheng Yang, Chengde Gao, Shuping Peng
Diopside (DIOP) was introduced into polyetheretherketone/polyglycolicacid (PEEK/PGA) scaffolds fabricated via selective laser sintering to improve bioactivity. The DIOP surface was then modified using a silane coupling agent, 3-glycidoxypropyltrimethoxysilane (KH570), to reinforce interfacial adhesion. The results showed that the tensile properties and thermal stability of the scaffolds were significantly enhanced. It could be explained that, on the one hand, the hydrophilic group of KH570 formed an organic covalent bond with the hydroxy group on DIOP surface...
March 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28330409/guidelines-on-constructing-funnel-plots-for-quality-indicators-a-case-study-on-mortality-in-intensive-care-unit-patients
#4
Ilona Wm Verburg, Rebecca Holman, Niels Peek, Ameen Abu-Hanna, Nicolette F de Keizer
Funnel plots are graphical tools to assess and compare clinical performance of a group of care professionals or care institutions on a quality indicator against a benchmark. Incorrect construction of funnel plots may lead to erroneous assessment and incorrect decisions potentially with severe consequences. We provide workflow-based guidance for data analysts on constructing funnel plots for the evaluation of binary quality indicators, expressed as proportions, risk-adjusted rates or standardised rates. Our guidelines assume the following steps: (1) defining policy level input; (2) checking the quality of models used for case-mix correction; (3) examining whether the number of observations per hospital is sufficient; (4) testing for overdispersion of the values of the quality indicator; (5) testing whether the values of quality indicators are associated with institutional characteristics; and (6) specifying how the funnel plot should be constructed...
January 1, 2017: Statistical Methods in Medical Research
https://www.readbyqxmd.com/read/28327654/constructive-quantum-interference-in-a-bis-copper-six-porphyrin-nanoring
#5
Sabine Richert, Jonathan Cremers, Ilya Kuprov, Martin D Peeks, Harry L Anderson, Christiane R Timmel
The exchange interaction, J, between two spin centres is a convenient measure of through bond electronic communication. Here, we investigate quantum interference phenomena in a bis-copper six-porphyrin nanoring by electron paramagnetic resonance spectroscopy via measurement of the exchange coupling between the copper centres. Using an analytical expression accounting for both dipolar and exchange coupling to simulate the time traces obtained in a double electron electron resonance experiment, we demonstrate that J can be quantified to high precision even in the presence of significant through-space coupling...
March 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28318567/determination-of-ochratoxin-a-in-wine-by-packed-in-tube-solid-phase-microextraction-followed-by-high-performance-liquid-chromatography-coupled-to-tandem-mass-spectrometry
#6
Mariane A Andrade, Fernando M Lanças
Ochratoxin A (OTA), a widely studied mycotoxin, can be found in a variety of food matrices. As its concentration in food is generally low (in the order of μg kg(-1)), sample preparation techniques are necessary for the analyte purification and pre-concentration in order to achieve the required low detection limits. The separation and detection methods used for OTA analysis should also offer proper sensitivity in order to allow the adequate quantification of the analyte. This manuscript addresses the development of a methodology aiming the analysis of OTA in wine samples by packed in-tube SPME in flow through extraction mode coupled to HPLC-MS/MS...
March 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28317137/prenatal-sonographic-features-of-cranioectodermal-dysplasia
#7
T Muttusamy, A Ma, I Sinnerbrink, A E Quinton, M J Peek, S Joung
No abstract text is available yet for this article.
March 20, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28316350/peek-and-cfr-peek-as-alternative-bearing-materials-to-uhmwpe-in-a-fixed-bearing-total-knee-replacement-an-experimental-wear-study
#8
Claire L Brockett, Silvia Carbone, John Fisher, Louise M Jennings
New bearing materials for total joint replacement have been explored as the need to improve longevity and enhance performance is driven by the changing demands of the patient demographic. Carbon-reinforced PEEK has demonstrated good wear characteristics in experimental wear simulation in both simple geometry pin-on-plate studies and in total hip joint replacement. Carbon reinforced PEEK CFR-PEEK has the potential to reduce tibial insert thickness and preserve bone in the knee. This study investigated the wear performance of PEEK and CFR-PEEK in a low conformity total knee replacement configuration...
March 15, 2017: Wear: An International Journal on the Science and Technology of Friction Lubrication and Wear
https://www.readbyqxmd.com/read/28315278/peeking-into-sigma-1-receptor-functions-through-the-retina
#9
Timur A Mavlyutov, Lian-Wang Guo
This review discusses recent advances towards understanding the sigma-1 receptor (S1R) as an endogenous neuro-protective mechanism in the retina , a favorable experimental model system. The exquisite architecture of the mammalian retina features layered and intricately wired neurons supported by non-neuronal cells. Ganglion neurons, photoreceptors , as well as the retinal pigment epithelium, are susceptible to degeneration that leads to major retinal diseases such as glaucoma , diabetic retinopathy , and age-related macular degeneration (AMD), and ultimately, blindness...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28302947/in-vivo-bioactivity-of-porous-polyetheretherketone-with-a-foamed-surface
#10
Ayato Hieda, Naoya Uemura, Yoshiya Hashimoto, Isumi Toda, Shunsuke Baba
The in vivo bioactivity of porous polyetheretherketone (PEEK) with a foamed surface was evaluated using rabbit femoral bone. Cylindrical porous PEEK scaffolds, with pore diameter of 550 μm and porosity of 70%, were first prepared and immersed in 98% sulfuric acid, and then washed and immersed in 3 M potassium carbonate solution used as a foaming reagent. Numerous open pores of various sizes, as well as new functional groups, were visualized on the treated PEEK surface by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively...
March 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28300369/perturbation-effects-of-the-carbon-fiber-peek-screws-on-radiotherapy-dose-distribution
#11
Alexander Nevelsky, Egor Borzov, Shahar Daniel, Raquel Bar-Deroma
Radiation therapy, in conjunction with surgical implant fixation, is a common combined treatment in cases of bone metastases. However, metal implants generally used in orthopedic implants perturb radiation dose distributions. Carbon-Fiber Reinforced Polyetheretherketone (CFR-PEEK) material has been recently introduced for production of intramedullary nails and plates. The purpose of this work was to investigate the perturbation effects of the new CFR-PEEK screws on radiotherapy dose distributions and to evaluate these effects in comparison with traditional titanium screws...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28299514/prognostic-and-predictive-value-of-circulating-tumor-cells-and-cxcr4-expression-as-biomarkers-for-a-cxcr4-peptide-antagonist-in-combination-with-carboplatin-etoposide-in-small-cell-lung-cancer-exploratory-analysis-of-a-phase-ii-study
#12
Ravi Salgia, R Waide Weaver, Michael McCleod, John R Stille, S Betty Yan, Stephanie Roberson, John Polzer, Amy Flynt, Eyas Raddad, Victoria L Peek, Sameera R Wijayawardana, Suzane L Um, Steve Gross, Mark C Connelly, Carrie Morano, Madeline Repollet, Renouard Sanders, Kurt Baeten, David D'Haese, David R Spigel
Background Circulating tumor cells (CTCs) and chemokine (C-X-C motif) receptor 4 (CXCR4) expression in CTCs and tumor tissue were evaluated as prognostic or predictive markers of CXCR4 peptide antagonist LY2510924 plus carboplatin-etoposide (CE) versus CE in extensive-stage disease small cell lung cancer (ED-SCLC). Methods This exploratory analysis of a phase II study evaluated CXCR4 expression in baseline tumor tissue and peripheral blood CTCs and in post-treatment CTCs. Optimum cutoff values were determined for CTC counts and CXCR4 expression in tumors and CTCs as predictors of survival outcome...
March 15, 2017: Investigational New Drugs
https://www.readbyqxmd.com/read/28287078/the-design-of-and-chronic-tissue-response-to-a-composite-nerve-electrode-with-patterned-stiffness
#13
Max Freeberg, Matthew Stone, Ronald Triolo, Dustin Tyler
As neural interfaces demonstrate success in chronic applications, a novel class of reshaping electrodes with patterned regions of stiffness will enable application to a widening range of anatomical locations. Patterning stiff regions and flexible regions of the electrode enables nerve reshaping while accommodating anatomical constraints of various implant locations ranging from peripheral nerves to spinal and autonomic plexi. Introduced is a new composite electrode enabling patterning of regions of various electrode mechanical properties...
March 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28279204/a-study-to-compare-the-efficacy-of-polyether-ether-ketone-rod-device-with-titanium-devices-in-posterior-spinal-fusion-in-a-canine-model
#14
Nanxiang Wang, Huanxin Xie, Chunyang Xi, Han Zhang, Jinglong Yan
BACKGROUND: The benefits of posterior lumbar fusion surgery with orthotopic paraspinal muscle-pediculated bone flaps are well established. However, the problem of non-union due to mechanical support is not completely resolved. The aim of the study was to compare the efficacy of polyether ether ketone (PEEK) rod device with conventional titanium devices in the posterior lumbar fusion surgery with orthotopic paraspinal muscle-pediculated bone flaps. METHODS: This was a randomized controlled study with an experimental animal model...
March 9, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28278014/muslim-women-s-perspectives-on-designing-mosque-based-women-s-health-interventions-an-exploratory-qualitative-study
#15
Milkie Vu, Hadiyah Muhammad, Monica E Peek, Aasim I Padela
Mosques could serve as a promising setting for health interventions. However, little empirical data are available to guide the development of mosque-based health interventions, especially for women. We aimed to assess Muslim women's views on effective strategies for mosque-based educational interventions to promote women's health. A sample of Muslim women of diverse ethnicity and race were recruited from mosques in Chicago to participate in semi-structured interviews. In interviews, 19 participants (aged 41-67 years) discussed characteristics of the imam and peer educator, aspects of the intervention modality, and content of health messaging that would be effective mosque-based health programs...
February 7, 2017: Women & Health
https://www.readbyqxmd.com/read/28265185/on-compression-and-damage-evolution-in-two-thermoplastics
#16
N K Bourne, S C Garcea, D S Eastwood, S Parry, C Rau, P J Withers, S A McDonald, E N Brown
The well-known Taylor cylinder impact test, which follows the impact of a flat-ended cylindrical rod onto a rigid stationary anvil, is conducted over a range of impact speeds for two polymers, polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK). In previous work, experiments and a model were developed to capture the deformation behaviour of the cylinder after impact. These works showed a region in which spatial and temporal variation of both longitudinal and radial deformation provided evidence of changes in phase within the material...
January 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28264242/polyetheretherketone-cage-with-demineralized-bone-matrix-can-replace-iliac-crest-autografts-for-anterior-cervical-discectomy-and-fusion-in-subaxial-cervical-spine-injuries
#17
Soo-Han Kim, Jung-Kil Lee, Jae-Won Jang, Hyun-Woong Park, Hyuk Hur
OBJECTIVE: This study aimed to compare the clinical and radiologic outcomes of patients with subaxial cervical injury who underwent anterior cervical discectomy and fusion (ACDF) with autologous iliac bone graft or polyetheretherketone (PEEK) cages using demineralized bone matrix (DBM). METHODS: From January 2005 to December 2010, 70 patients who underwent one-level ACDF with plate fixation for post-traumatic subaxial cervical spinal injury in a single institution were retrospectively investigated...
March 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28264032/interactions-of-adolescent-social-experiences-and-dopamine-genes-to-predict-physical-intimate-partner-violence-perpetration
#18
Laura M Schwab-Reese, Edith A Parker, Corinne Peek-Asa
OBJECTIVES: We examined the interactions between three dopamine gene alleles (DAT1, DRD2, DRD4) previously associated with violent behavior and two components of the adolescent environment (exposure to violence, school social environment) to predict adulthood physical intimate partner violence (IPV) perpetration among white men and women. METHODS: We used data from Wave IV of the National Longitudinal Study of Adolescent to Adult Health, a cohort study following individuals from adolescence to adulthood...
2017: PloS One
https://www.readbyqxmd.com/read/28245995/examination-of-adult-and-child-bicyclist-safety-relevant-events-using-naturalistic-bicycling-methodology
#19
Cara J Hamann, Corinne Peek-Asa
Among roadway users, bicyclists are considered vulnerable due to their high risk for injury when involved in a crash. Little is known about the circumstances leading to near crashes, crashes, and related injuries or how these vary by age and gender. The purpose of this study was to examine the rates and characteristics of safety-relevant events (crashes, near crashes, errors, and traffic violations) among adult and child bicyclists. Bicyclist trips were captured using Pedal Portal, a data acquisition and coding system which includes a GPS-enabled video camera and graphical user interface...
February 25, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28243301/fracture-strength-of-three-unit-implant-supported-fixed-partial-dentures-with-excessive-crown-height-fabricated-from-different-materials
#20
Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri
OBJECTIVES: Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials. MATERIALS AND METHODS: Two implants with corresponding abutments were mounted in a metal model that simulated mandibular second premolar and second molar...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
keyword
keyword
43993
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"