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Search Results: 1 - 10 of 162807 matches for " James B. Hannon "
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Field-effect transistors assembled from functionalized carbon nanotubes
Christian Klinke,James B. Hannon,Ali Afzali,Phaedon Avouris
Physics , 2006, DOI: 10.1021/nl052473f
Abstract: We have fabricated field effect transistors from carbon nanotubes using a novel selective placement scheme. We use carbon nanotubes that are covalently bound to molecules containing hydroxamic acid functionality. The functionalized nanotubes bind strongly to basic metal oxide surfaces, but not to silicon dioxide. Upon annealing, the functionalization is removed, restoring the electronic properties of the nanotubes. The devices we have fabricated show excellent electrical characteristics.
Cerebral Fat Embolism Syndrome from Penetrating Trauma: A Rare Cause-and-Effect  [PDF]
Stephen J. Gleich,James D. Hannon
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.34052
Abstract: A 42 year-old male sustained an accidental rifle gunshot wound to his left foot, resulting in fracture deformities of the calcaneus, navicular, cuneiform, 1st and 2nd metatarsal bases, and talus. As he was transported to our trauma center, he developed progressive encephalopathy. Urgent external fixator placement under general anesthesia was postponed due to his encephalopathy of unknown etiology. Brain magnetic resonance imaging demonstrated a “starfield” pattern of infarcts, consistent with cerebral fat embolism syndrome. Subsequently, he underwent uneventful general anesthesia. The patient was managed supportively and continued to have persistent neurologic dysfunction two months after injury.
Cerebral Fat Embolism Syndrome from Penetrating Trauma: A Rare Cause-and-Effect  [PDF]
Stephen J. Gleich, James D. Hannon
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.34052
Abstract:

A 42 year-old male sustained an accidental rifle gunshot wound to his left foot, resulting in fracture deformities of the calcaneus, navicular, cuneiform, 1st and 2nd metatarsal bases, and talus. As he was transported to our trauma center, he developed progressive encephalopathy. Urgent external fixator placement under general anesthesia was postponed due to his encephalopathy of unknown etiology. Brain magnetic resonance imaging demonstrated a “starfield” pattern of infarcts, consistent with cerebral fat embolism syndrome. Subsequently, he underwent uneventful general anesthesia. The patient was managed supportively and continued to have persistent neurologic dysfunction two months after injury.

Argon Assisted Growth of Epitaxial Graphene on Cu(111)
Zachary R. Robinson,Parul Tyagi,Tyler R. Mowll,James B. Hannon,Carl A. Ventrice Jr
Physics , 2013, DOI: 10.1103/PhysRevB.86.235413
Abstract: The growth of graphene by catalytic decomposition of ethylene on Cu(111) in an ultra-high vacuum system was investigated with low energy electron diffraction, low energy electron microscopy, and atomic force microscopy. Attempts to form a graphene overlayer using ethylene at pressures as high as 10 mTorr and substrate temperatures as high as 900 $^\circ$C resulted in almost no graphene growth. By using an argon overpressure, the growth of epitaxial graphene on Cu(111) was achieved. The suppression of graphene growth without the use of an argon overpressure is attributed to Cu sublimation at elevated temperatures. During the initial stages of growth, a random distribution of rounded graphene islands is observed. The predominant rotational orientation of the islands is within $\pm1^\circ$ of the Cu(111) substrate lattice.
Tungsten oxide nanowire growth by chemically-induced strain
Christian Klinke,James B. Hannon,Lynne Gignac,Kathleen Reuter,Phaedon Avouris
Physics , 2006, DOI: 10.1021/jp0533224
Abstract: We have investigated the formation of tungsten oxide nanowires under different CVD conditions. We find that exposure of oxidized tungsten films to hydrogen and methane at 900C leads to the formation of a dense array of typically 10 nm diameter nanowires. Structural and chemical analysis shows that the wires are crystalline WO3. We propose a chemically-driven whisker growth mechanism in which interfacial strain associated with the formation of tungsten carbide stimulates nanowire growth. This might be a general concept, applicable also in other nanowire systems.
Physical activity and dietary behaviors of health clinic workers trying to lose weight  [PDF]
Tan Leng Goh, Trever Ball, Janet M. Shaw, James C. Hannon
Health (Health) , 2012, DOI: 10.4236/health.2012.48079
Abstract: Health clinic workers are potential agents of change for weight loss to patients, yet their behaviors are not well known. This study examined physical activity (PA) levels and dietary habits of health clinic workers who were and who were not trying to lose weight. Participants were 64 community health clinic workers (58 females and 6 males). Moderate-to-vigorous intensity (MVI) time spent in PA was assessed by triaxial accelerometry over 7 consecutive days. Dietary habits and weight loss efforts were determined by a food frequency questionnaire. Differences in MVI and nutrition variables were assessed by One-way ANOVA, comparing those trying to lose weight and those not trying to lose weight. 48 out of 64 health clinic workers (approximately 75%) indicated that they were currently trying to lose weight. There were significant differences (p < 0.05) in Body Mass Index (BMI), daily energy (Kcal) and fat (g) intake between those trying to lose weight and those not trying to lose weight. There were no significant differences in MVI, daily sugar intake (g), vegetable and fruit servings, and daily fiber intake (g) between groups. Health clinic workers trying to lose weight appear to be engaging in some appropriate dietary but not PA behaviors.
Youth Physical Activity and Enjoyment during Semi-Structured versus Unstructured School Recess  [PDF]
Jessyka N. Larson, Timothy A. Brusseau, Benjamin Chase, Angela Heinemann, James C. Hannon
Open Journal of Preventive Medicine (OJPM) , 2014, DOI: 10.4236/ojpm.2014.48072
Abstract:

Background: Physical activity throughout the school day may help reduce the risk of childhood obesity. Semi-structured recess is a unique approach to create more physical activity. Therefore, the purpose of this study was to compare the physical activity and enjoyment of urban school children during traditional unstructured recess and semi-structured recess. Method: Children from the Southwestern US (N = 165) wore a NL-1000 piezoelectric accelerometer during their 15-minute lunch recess. Children participated in both their traditional unstructured (no structure and no equipment) recess and semi-structured (organized games and equipment) recess. An enjoyment scale was completed after both types of recess formats. Results: During unstructured recess, children accumulated 1028 ± 356 steps and 4.59 ± 2.2 minutes of MVPA compared to 1156 ± 434 steps and 5.44 ± 2.76 minutes of moderate to vigorous physical activity (MVPA) during semi-structured recess. Paired sample t-tests revealed that children took significantly more steps (t = 4.98; p < 0.001) and MVPA (t = 5.940; p < 0.001) during semi-structured recess. No significant differences were found for enjoyment (p = 0.847) between recesses. Conclusions: It is important for schools to consider creative, semi-structured recess opportunities to increase step counts and time in MVPA (while maintaining

Concurrent and Criterion-Referenced Validity of Trunk Muscular Fitness Tests in School-Aged Children  [PDF]
Ryan D. Burns, James C. Hannon, Pedro F. Saint-Maurice, Gregory J. Welk
Advances in Physical Education (APE) , 2014, DOI: 10.4236/ape.2014.42007
Abstract:

A cause of limited physical activity levels in youth is the presence of low back pain (LBP), therefore proper assessment of low back function in physical education settings is needed to identify children who may be at risk. The purpose of this study was to determine the concurrent and criterion-referenced validity of field tests of low back and core muscular endurance in school-aged children. The sample consisted of 4th through 10th grade students (N = 370) who completed low back and core muscular fitness tests on four separate testing days during their physical education classes. Field measures related to low back function included the Box 90° Trunk Extension (Box 90°) and the FITNESSGRAM Trunk Extension (FG-TE). Field measures related to overall core function consisted of a Lateral Plank, Prone Plank, and a Static and Dynamic Curl-up. Criterion measures of low-back muscular endurance included the Parallel Roman Chair Dynamic Trunk Extension (PRC-DTE) and the Parallel Roman Chair Static Trunk Extension (PRC-STE). Multivariate analysis using canonical correlations showed moderate correlations between low back and core measures (P < .001). The Lateral Plank, Prone Plank, and Dynamic Curl-up had moderate-to-strong canonical cross-loadings with the low back measure variate. The FG-TE displayed an insignificant canonical coefficient, and weak canonical loadings and cross-loadings. Measures of overall core function also significantly agreed with the criterion measures in classifying students into ranked tertile groups (P < .001). These results suggest that assessment of specific low back muscular function can be easily evaluated using tests of overall core muscular endurance as an alternative to the FG-TE in physical education settings.

Associations between Health-Related Fitness and Cardio-Metabolic Blood Profiles in Low-Income Children  [PDF]
Ryan D. Burns, Timothy A. Brusseau, You Fu, James C. Hannon
Open Journal of Preventive Medicine (OJPM) , 2015, DOI: 10.4236/ojpm.2015.59041
Abstract: Children from low-income families have a higher incidence for developing early onset cardio-metabolic disease risk factors. Optimal levels of health-related fitness may attenuate risk, but little research has examined its relationships with individual cardio-metabolic blood markers in low-income children. The purpose of this study was to examine the prevalence and correlates of unfavorable cardio-metabolic blood profiles in children from low-income families. Data were collected and analyzed on 124 children (mean age = 10.4 ± 0.9 years; 57 girls, 67 boys; 97% Hispanic) recruited from three urban Title I schools from the state of Utah in the US Health-related fitness. Measures were collected using the validated FITNESSGRAM fitness test battery. The Cholestech LDX system was used to analyze students’ total cholesterol (TC), LDL cholesterol, HDL cholesterol, triglycerides (TRI), and blood glucose (BG). Capillary blood samples via finger sticks were collected while each student was in a fasted state before school hours. Unfavorable measurements were defined as TC ≥ 200 mg/dL, LDL ≥ 130 mg/dL, HDL < 40 mg/dL, TRI > 150 mg/dL, and BG ≥ 100 mg/dL (pre-diabetes). Approximately 5.3% of the total sample had unfavorable TC, 16.7% had unfavorable HDL, 16.0% had unfavorable LDL, 15.2% had unfavorable TRI, and 25.4% had unfavorable BG (pre-diabetes). Pearson’s chi-square tests revealed no significant differences between sexes on any unfavorable classification after alpha level adjustment (p > 0.01). When all parameters were analyzed as continuous variables, Spearman’s rank correlation revealed a statistically significant linear relationship between aerobic fitness and LDL in boys (rs = -?0.65, p < 0.01), between BMI and HDL in girls (rs = - 0.46, p < 0.01), and between BMI and BG in girls (rs = 0.56, p < 0.01). Aerobic fitness relates to LDL cholesterol in low-income boys and BMI relates to HDL cholesterol and BG in low-income girls.
Iatrogenic Left Main Bronchus Injury following Atraumatic Double Lumen Endotracheal Tube Placement
William R. Hartman,Michael Brown,James Hannon
Case Reports in Anesthesiology , 2013, DOI: 10.1155/2013/524348
Abstract: Tracheobronchial disruption is an uncommon but severe complication of double lumen endotracheal tube placement. The physical properties of a double lumen tube (large external diameter and length) make tracheobronchial injury more common than that associated with smaller single lumen endotracheal tubes. Here we present the case of an iatrogenic left main bronchus injury caused by placement of a double lumen tube in an otherwise unremarkable airway. 1. Introduction Thoracic surgery procedures requiring lung isolation are often performed with the assistance of a double lumen endotracheal tube (DLT). While placement of DLTs is routine and safe in experienced hands, it is not without risk. A rare complication is airway rupture, perhaps due to DLTs having a larger external diameter compared to a single lumen tube and a stiff stylette used for ease of proper endotracheal tube placement [1, 2]. Early recognition of airway rupture, evaluation of the defect, and repair of the airway are critical to optimal patient outcome [3]. Here we present the case of a 52-year-old woman who presented to the operating room for removal of a right upper lobe mass via right thoracotomy. Despite a seemingly atraumatic intubation with a 35-French left double lumen endotracheal tube, a significant tear in her left main bronchus was identified intraoperatively. 2. Case Report A 158?cm, 93?kg (BMI 37.4), 52-year-old woman presented to a tertiary care center for evaluation of a Merkel cell tumor in her right forearm. Wide resection of this forearm tumor and an axillary lymph node dissection were successfully performed. During the course of her evaluation, however, a suspicious mass in her right upper lobe was identified on chest X-ray, and a 2.7 × 2.2 × 2.9?cm hypermetabolic solid nodule in the right apex was confirmed with CT imaging. The patient was asymptomatic. Preoperative pulmonary function tests were normal. Patient was deemed to be optimized for a thoracic surgical procedure and was brought to the operating room. After routine intravenous sedation with Midazolam and Fentanyl, an epidural was placed at the T6-7 vertebral interspace. Patient was returned to the supine position where general anesthesia was induced intravenously with fentanyl, lidocaine, propofol, and succinylcholine. Her airway was secured via direct laryngoscopy (grade one view) and placement of a styleted 35-French left double lumen endotracheal tube without difficulty. Once the tracheal cuff had passed through the cords, the stylette was removed and bilateral breath sounds were confirmed. Proper placement of
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