50 CFR 665.127 - Allowable gear and gear restrictions.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Allowable gear and gear restrictions. 665... Fisheries § 665.127 Allowable gear and gear restrictions. (a) American Samoa coral reef ecosystem MUS may be taken only with the following allowable gear and methods: (1) Hand harvest; (2) Spear; (3) Slurp gun; (4...

50 CFR 665.627 - Allowable gear and gear restrictions.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Allowable gear and gear restrictions. 665... Island Area Fisheries § 665.627 Allowable gear and gear restrictions. (a) Coral reef ecosystem MUS may be taken only with the following allowable gear and methods: (1) Hand harvest; (2) Spear; (3) Slurp gun; (4...

Frequent fliers, school phobias, and the sick student: school health personnel's perceptions of students who refuse school.

Science.gov (United States)

Torrens Armstrong, Anna M; McCormack Brown, Kelli R; Brindley, Roger; Coreil, Jeannine; McDermott, Robert J

2011-09-01

This study explored school personnel's perceptions of school refusal, as it has been described as a "common educational and public health problem" that is less tolerated due to increasing awareness of the potential socioeconomic consequences of this phenomenon. In-depth interviews were conducted with school personnel at the middle school (N = 42), high school (N = 40), and district levels (N = 10). The findings focus on emergent themes from interviews with school health personnel (N = 12), particularly those themes related to their perceptions of and role in working with school-refusing students. Personnel, especially school health services staff, constructed a typification of the school-refusing student as "the sick student," which conceptualized student refusal due to reasons related to illness. Personnel further delineated sick students by whether they considered the illness legitimate. School health personnel referenced the infamous "frequent fliers" and "school phobics" within this categorization of students. Overarching dynamics of this typification included parental control, parental awareness, student locus of control, blame, and victim status. These typifications influenced how personnel reacted to students they encountered, particularly in deciding which students need "help" versus "discipline," thus presenting implications for students and screening of students. Overall, findings suggest school health personnel play a pivotal role in screening students who are refusing school as well as keeping students in school, underscoring policy that supports an increased presence of school health personnel. Recommendations for school health, prevention, and early intervention include the development of screening protocols and staff training. © 2011, American School Health Association.

Reduction of belt CVT gear noise by gear train modification. Optimize vibration characteristics of gear train; Belt CVT no gear noise teigen gijutsu. Gear train shindo tokusei no saitekika

Energy Technology Data Exchange (ETDEWEB)

Arimatsu, M; Kawakami, T [Nissan Motor Co. Ltd., Tokyo (Japan)

1997-10-01

With the reduction of vehicle noise, the requirements for an efficient method to reduce transmission gear noise have become stronger yearly. So far efforts to reduce gear noise have generally focused on ways of improving the gears themselves. In addition to these traditional methods, it proved very beneficial to us to optimize the gear train structure. Nissan has just released the new Belt CVT for 2.0L Front wheel drive vehicles. We have been analyzing vibration of the gear train by using a finite element model since the early development stage, and we could achieve the quiet gears effectively. 2 refs., 9 figs.

50 CFR 648.84 - Gear-marking requirements and gear restrictions.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Gear-marking requirements and gear... Management Measures for the NE Multispecies and Monkfish Fisheries § 648.84 Gear-marking requirements and gear restrictions. (a) Bottom-tending fixed gear, including, but not limited to, gillnets and longlines...

Differential determination of perceived stress in medical students and high-school graduates due to private and training-related stressors

Science.gov (United States)

Herrmann–Werner, Anne; Keifenheim, Katharina Eva; Loda, Teresa; Bugaj, Till Johannes; Nikendei, Christoph; Lammerding–Köppel, Maria; Zipfel, Stephan; Junne, Florian

2018-01-01

Objective Numerous studies from diverse contexts have confirmed high stress levels and stress-associated health impairment in medical students. This study aimed to explore the differential association of perceived stress with private and training-related stressors in medical students according to their stage of medical education. Methods Participants were high-school graduates who plan to study medicine and students in their first, third, sixth, or ninth semester of medical school or in practical medical training. The self-administered questionnaire included items addressing demographic information, the Perceived Stress Questionnaire, and items addressing potential private and training-related stressors. Results Results confirmed a substantial burden of perceived stress in students at different stages of their medical education. In particular, 10–28% of students in their third or ninth semesters of medical school showed the highest values for perceived stress. Training-related stressors were most strongly associated with perceived stress, although specific stressors that determined perceived stress varied across different stages of students’ medical education. High-school graduates highly interested in pursuing medical education showed specific stressors similar to those of medical students in their third, sixth, or ninth semesters of medical school, as well as stress structures with heights of general stress rates similar to those of medical students at the beginning of practical medical training. Conclusions High-school graduates offer new, interesting information about students’ fears and needs before they begin medical school. Medical students and high-school graduates need open, comprehensive information about possible stressors at the outset of and during medical education. Programmes geared toward improving resilience behaviour and teaching new, functional coping strategies are recommended. PMID:29385180

Downside Seen in Rush to Hire School-Based Police

Science.gov (United States)

Shah, Nirvi

2013-01-01

With nightmare visions of a gunman stalking school halls, districts often rush to hire police officers to patrol their campuses after news of a school shooting. Critics of that impulsive response, which has been in high gear nationwide since the Sandy Hook Elementary School shootings in December, acknowledge the concern for student and staff…

High Pressure Angle Gears: Comparison to Typical Gear Designs

Science.gov (United States)

Handschuh, Robert F.; Zabrajsek, Andrew J.

2010-01-01

A preliminary study has been completed to determine the feasibility of using high-pressure angle gears in aeronautic and space applications. Tests were conducted in the NASA Glenn Research Center (GRC) Spur Gear Test Facility at speeds up to 10,000 rpm and 73 N*m (648 in.*lb) for 3.18, 2.12, and 1.59 module gears (8, 12, and 16 diametral pitch gears), all designed to operate in the same test facility. The 3.18 module (8-diametral pitch), 28 tooth, 20deg pressure angle gears are the GRC baseline test specimen. Also, 2.12 module (12-diametral pitch), 42 tooth, 25deg pressure angle gears were tested. Finally 1.59 module (16-diametral pitch), 56 tooth, 35deg pressure angle gears were tested. The high-pressure angle gears were the most efficient when operated in the high-speed aerospace mode (10,000 rpm, lubricated with a synthetic turbine engine oil), and produced the lowest wear rates when tested with a perfluoroether-based grease. The grease tests were conducted at 150 rpm and 71 N*m (630 in.*lb).

Modern gear production

CERN Document Server

Watson, H J

1970-01-01

Modern Gear Production focuses on the processes and methods in gear making. The book first gives information on the history of gear making and types of gears. Topics such as the classification of gears based on the disposition of their shafts; shafts lying in the same plane with axes intersecting; and shafts lying in parallel planes but with axes inclined to one another are then discussed. The text describes gear groups, tooth forms, and gear materials. Heat treatment of steels, casehardening, nitriding, induction hardening, sulfinuzing, and flame hardening are explained. The book takes a look

Test gear and measurements a collection of useful and tested circuit design ideas'

CERN Document Server

Stewart OBE DLitthc, David

2013-01-01

This book provides a clear introduction to test gear in the field of electronics. As well as being a first guide to test gear and its use, the book includes much practical information and reference material for the more experienced electronics enthusiast or student.Based on a collection of feature articles originally published in Electronics - the Maplin Magazine, this work by Danny Stewart is sure to be useful to electronics constructors, students and experimenters alike. Details of all the common (and some not-so-common) items of test gear are included, alongside information regarding its us

Load Sharing Behavior of Star Gearing Reducer for Geared Turbofan Engine

Science.gov (United States)

Mo, Shuai; Zhang, Yidu; Wu, Qiong; Wang, Feiming; Matsumura, Shigeki; Houjoh, Haruo

2017-07-01

Load sharing behavior is very important for power-split gearing system, star gearing reducer as a new type and special transmission system can be used in many industry fields. However, there is few literature regarding the key multiple-split load sharing issue in main gearbox used in new type geared turbofan engine. Further mechanism analysis are made on load sharing behavior among star gears of star gearing reducer for geared turbofan engine. Comprehensive meshing error analysis are conducted on eccentricity error, gear thickness error, base pitch error, assembly error, and bearing error of star gearing reducer respectively. Floating meshing error resulting from meshing clearance variation caused by the simultaneous floating of sun gear and annular gear are taken into account. A refined mathematical model for load sharing coefficient calculation is established in consideration of different meshing stiffness and supporting stiffness for components. The regular curves of load sharing coefficient under the influence of interactions, single action and single variation of various component errors are obtained. The accurate sensitivity of load sharing coefficient toward different errors is mastered. The load sharing coefficient of star gearing reducer is 1.033 and the maximum meshing force in gear tooth is about 3010 N. This paper provides scientific theory evidences for optimal parameter design and proper tolerance distribution in advanced development and manufacturing process, so as to achieve optimal effects in economy and technology.

[Prevalence of and factors related to depression in high school students].

Science.gov (United States)

Eskin, Mehmet; Ertekin, Kamil; Harlak, Hacer; Dereboy, Ciğdem

2008-01-01

The study aimed at investigating the prevalence of and factors related to depression in high school students. A total of 805 (n = 367 girls; n = 438 boys) first year students from three high schools in the city of Aydin filled in a self-report questionnaire that contained questions about socio-demographics, academic achievement and religious belief. It included also a depression rating scale, social support scale, problem solving inventory and an assertiveness scale. T-tests, chi-square tests, Pearson moment products correlation coefficients, and logistic regression analysis were used to analyze the data. 141 students (17.5%) scored on and above the cut-off point on the Children Depression Inventory (CDI). In the first regression analyses low self-esteem, low grade point average (GPA) and low perceived social support from friends in boys, and low self-esteem, low paternal educational level and low social support from friends were the predictors of girls' depression. When self-esteem scores were excluded, low GPA, low perceived social support from friends and family, and inefficient problem solving skills were predictors of depression in boys; low perceived social support from friends and family, low paternal educational level, and inefficient problem solving skills were the independent predictors of depression in girls. Depression is prevalent in high school students. Low self-esteem, low perceived social support from peers and family, and inefficient problem solving skills appears to be risk factors for adolescent depression. Low GPA for boys and low paternal education for girls were gender specific risk factors. Psychosocial interventions geared for increasing self-esteem, social support and problem solving skills may be effective in the prevention and treatment of adolescent depression.

Teaching Planetary Gear Trains with the Aid of Nomographs

Directory of Open Access Journals (Sweden)

Essam Lauibi Esmail

2013-01-01

Full Text Available Planetary gear trains (PGTs are introduced to undergraduate mechanical engineering students in the course of Theory of Machines. The complexity of the traditional methods for analyzing PGTs has kept many from becoming familiar with the capability of PGTs in mechanisms and machine design. In this paper a unified general formulation for simultaneously visualizing velocities, torques, and power flow through a train is presented on a single nomograph. Therefore, the increasing complex mechanical systems, such as automotive transmissions, are much easier to understand. Nomographs of Fundamental Gear Entities (FGEs are constructed based on the nomographs of their fundamental circuits, without specifying the exact gear dimensions. They are then unified in one system nomograph. Nomographs are promising to provide designers with an efficient tool for the design of geared mechanisms.

Double Helical Gear Performance Results in High Speed Gear Trains

Science.gov (United States)

Handschuh, Robert F.; Ehinger, Ryan; Sinusas, Eric; Kilmain, Charles

2010-01-01

The operation of high speed gearing systems in the transmissions of tiltrotor aircraft has an effect on overall propulsion system efficiency. Recent work has focused on many aspects of high-speed helical gear trains as would be used in tiltrotor aircraft such as operational characteristics, comparison of analytical predictions to experimental data and the affect of superfinishing on transmission performance. Baseline tests of an aerospace quality system have been conducted in the NASA Glenn High-Speed Helical Gear Train Test Facility and have been described in earlier studies. These earlier tests had utilized single helical gears. The results that will be described in this study are those attained using double helical gears. This type of gear mesh can be configured in this facility to either pump the air-oil environment from the center gap between the meshing gears to the outside of tooth ends or in the reverse direction. Tests were conducted with both inward and outward air-oil pumping directions. Results are compared to the earlier baseline results of single helical gears.

analysis of gear milling at vari gear milling at various gear milling

African Journals Online (AJOL)

eobe

2 DEPARTMENT OF INDUSTRIAL AND ... conventional machine tools, cutter tool wear, .... speed, and tool wear on case-hardened gear is also .... study. The gear cutter is mounted on the spindle. Spindle speeds and feed rates are essential ...

Gear ratting noise reduction of diesel engine; Diesel engine no gear hauchi soon teigen

Energy Technology Data Exchange (ETDEWEB)

Nakamura, S; Miura, Y [Hino Motors, Ltd., Tokyo (Japan)

1997-10-01

Gear raffling noise of diesel engine at idling condition is required to reduce for keeping quiet environment and comfort of driver and passengers on track and bus. Decrease of gear backlash is generally adopted for reducing gear rattling noise. On the other hand, it has been found that newly devised measurement of gear teeth speed and gear meshing error has clarified phenomena of gear rattling between the crankshaft gear and the camshaft gear of the diesel engine. And it has been also found that gear ratting noise is reduced by changing meshing between the crankshaft gear and the camshaft gear. 2 refs., 10 figs.

Analysis of justification for applying two gear sets within the universal gear reducers

OpenAIRE

Rackov Milan; Kuzmanović Siniša; Knežević Ivan; Čavić Maja; Penčić Marko

2017-01-01

In the area of universal gear reducers, standard does not prescribe relations between load capacity, gear ratios and axis heights. Therefore, larger load capacity of some gear reducers manufacturers has advantage for lower gear ratio and, vice versa, smaller load capacity of the gearbox achieves higher values of gear ratio. However, there are some manufacturers who produce gear reducers with smaller or larger load capacity for higher or lower gear ratio, within the same axis height. This pape...

Offset Compound Gear Drive

Science.gov (United States)

Stevens, Mark A.; Handschuh, Robert F.; Lewicki, David G.

2010-01-01

The Offset Compound Gear Drive is an in-line, discrete, two-speed device utilizing a special offset compound gear that has both an internal tooth configuration on the input end and external tooth configuration on the output end, thus allowing it to mesh in series, simultaneously, with both a smaller external tooth input gear and a larger internal tooth output gear. This unique geometry and offset axis permits the compound gear to mesh with the smaller diameter input gear and the larger diameter output gear, both of which are on the same central, or primary, centerline. This configuration results in a compact in-line reduction gear set consisting of fewer gears and bearings than a conventional planetary gear train. Switching between the two output ratios is accomplished through a main control clutch and sprag. Power flow to the above is transmitted through concentric power paths. Low-speed operation is accomplished in two meshes. For the purpose of illustrating the low-speed output operation, the following example pitch diameters are given. A 5.0 pitch diameter (PD) input gear to 7.50 PD (internal tooth) intermediate gear (0.667 reduction mesh), and a 7.50 PD (external tooth) intermediate gear to a 10.00 PD output gear (0.750 reduction mesh). Note that it is not required that the intermediate gears on the offset axis be of the same diameter. For this example, the resultant low-speed ratio is 2:1 (output speed = 0.500; product of stage one 0.667 reduction and stage two 0.750 stage reduction). The design is not restricted to the example pitch diameters, or output ratio. From the output gear, power is transmitted through a hollow drive shaft, which, in turn, drives a sprag during which time the main clutch is disengaged.

Student-teacher relationships matter for school inclusion: school belonging, disability, and school transitions.

Science.gov (United States)

Crouch, Ronald; Keys, Christopher B; McMahon, Susan D

2014-01-01

For students with disabilities, the process of school inclusion often begins with a move from segregated settings into general education classrooms. School transitions can be stressful as students adjust to a new environment. This study examines the adjustment of 133 students with and without disabilities who moved from a school that served primarily students with disabilities into 23 public schools in a large urban school district in the Midwest. These students and 111 of their teachers and other school staff rated the degree that students felt they belonged in their new schools and the quality of their social interactions. Results show that students who experienced more positive and fewer negative social interactions with school staff had higher school belonging. Teachers accurately noted whether students felt they belonged in their new settings, but were not consistently able to identify student perceptions of negative social interactions with staff. Implications for inclusion and improving our educational system are explored.

Student center approach in maths and sc

African Journals Online (AJOL)

User

teachers were effectively utilizing prior knowledge of learners in starting their ... rated as poor in making classroom environment conducive for group learning. .... measure. These all are geared toward enhancing students' learning of ... They need to scaffold each other learning ... In short, the following schools ..... interaction.

Gear bearing drive

Science.gov (United States)

Mavroidis, Constantinos (Inventor); Vranish, John M. (Inventor); Weinberg, Brian (Inventor)

2011-01-01

A gear bearing drive provides a compact mechanism that operates as an actuator providing torque and as a joint providing support. The drive includes a gear arrangement integrating an external rotor DC motor within a sun gear. Locking surfaces maintain the components of the drive in alignment and provide support for axial loads and moments. The gear bearing drive has a variety of applications, including as a joint in robotic arms and prosthetic limbs.

Gear Tooth Root Stresses of a Very Heavily Loaded Gear Pair-Case Study: Orbiter Body Flap Actuator Pinion and Ring Gear

Science.gov (United States)

Krantz, Timothy L.; Handschuh, Robert F.

2015-01-01

The space shuttle orbiter's body flap actuator gearing was assessed as a case study of the stresses for very heavily loaded external-internal gear pairs (meshing pinion and ring gear). For many applications, using the high point of single tooth contact (HPSTC) to locate the position of the tooth force is adequate for assessing the maximum tooth root stress condition. But for aerospace gearing such an approach may be inadequate for assessing the stress condition while also simultaneously minimizing mass. In this work specialized contact analyses and finite element methods were used to study gear tooth stresses of body flap actuator gears. The analytical solutions considered the elastic deformations as an inherent part of the solutions. The ratio for the maximum tooth stresses using the HPSTC approach solutions relative to the contact analysis and finite element solutions were 1.40 for the ring gear and 1.28 for the pinion gear.

Kinematic geometry of gearing

CERN Document Server

Dooner, David B

2012-01-01

Building on the first edition published in 1995 this new edition of Kinematic Geometry of Gearing has been extensively revised and updated with new and original material. This includes the methodology for general tooth forms, radius of torsure', cylinder of osculation, and cylindroid of torsure; the author has also completely reworked the '3 laws of gearing', the first law re-written to better parallel the existing 'Law of Gearing" as pioneered by Leonard Euler, expanded from Euler's original law to encompass non-circular gears and hypoid gears, the 2nd law of gearing describing a unique relat

Does School Choice Improve Student Performance?

OpenAIRE

Kaja Høiseth Brugård

2013-01-01

This paper studies the relationship between school choice and student performance for high school students in Norway. The analysis exploits both the fact that the degree of school choice formally differs between counties, and detailed information on travelling distances to high schools, which more closely reflects the students' actual school choice possibilities. Information on students' residence, high school location, and the degree of formal school choice is used to estimate the effect on ...

A Comprehensive Partnership Approach Increasing High School Graduation Rates and College Enrollment of Urban Economically Disadvantaged Youth

Science.gov (United States)

Morgan, Yvette; Sinatra, Richard; Eschenauer, Robert

2015-01-01

Described is a 4-year model of a Gaining Early Awareness and Readiness for Undergraduate Program (GEAR UP) offered to 294 academically and economically disadvantaged students and their parents during in- and out-of-school time activities through partnerships forged with school personnel and community-based agencies. In an urban high school where…

Teaching molecular diffusion using an inquiry approach : diffusion activities in a secondary school inquiry-learning community

NARCIS (Netherlands)

van Rens, L.; van der Schee, J.; Pilot, A.

2009-01-01

The Dutch chemistry curriculum for upper secondary schools has prescribed inquiry-based student learning since 1997. For some decades inquiry tasks have been a feature of school science in various countries (1). As in other countries, some of our chemistry teachers are used to recipe-geared

Student nurses as school nurse extenders.

Science.gov (United States)

Rossman, Carol L; Dood, Florence V; Squires, Darcy A

2012-12-01

The severe underuse of school nurses leaves students with unaddressed health needs that impact their safety and learning ability. An undergraduate pediatric clinical focusing on nursing students and the role of a school nurse in an elementary school setting can be a unique approach to combining the needs of school children and educating student nurses. One school of nursing created such a project to help address these needs and collect data on the activities student nurses performed in school nurse role and their impact on student health. This project serves as both a practice improvement project and an innovation in pediatric clinical education. The purposes of this project were to quantify baccalaureate nursing student activities related to the school nurse role and to evaluate the results that have the potential to impact on student health in an urban elementary school. Copyright © 2012 Elsevier Inc. All rights reserved.

Landing gear noise attenuation

Science.gov (United States)

Moe, Jeffrey W. (Inventor); Whitmire, Julia (Inventor); Kwan, Hwa-Wan (Inventor); Abeysinghe, Amal (Inventor)

2011-01-01

A landing gear noise attenuator mitigates noise generated by airframe deployable landing gear. The noise attenuator can have a first position when the landing gear is in its deployed or down position, and a second position when the landing gear is in its up or stowed position. The noise attenuator may be an inflatable fairing that does not compromise limited space constraints associated with landing gear retraction and stowage. A truck fairing mounted under a truck beam can have a compliant edge to allow for non-destructive impingement of a deflected fire during certain conditions.

Students "Hacking" School Computer Systems

Science.gov (United States)

Stover, Del

2005-01-01

This article deals with students hacking school computer systems. School districts are getting tough with students "hacking" into school computers to change grades, poke through files, or just pit their high-tech skills against district security. Dozens of students have been prosecuted recently under state laws on identity theft and unauthorized…

Gearing Up for Mountain Biking.

Science.gov (United States)

Jahnke, Thomas; Hamson, Mike

1999-01-01

Examines the gear system of a mountain bike to discover any redundancy in the many gear settings available to the cyclist. Suggests a best strategy for changing up through the gears on a typical 21-gear system and an adjustment to the available gears that would result in a smoother change. (Author/ASK)

School Libraries and Student Learning: A Guide for School Leaders

Science.gov (United States)

Morris, Rebecca J.

2015-01-01

Innovative, well-designed school library programs can be critical resources for helping students meet high standards of college and career readiness. In "School Libraries and Student Learning", Rebecca J. Morris shows how school leaders can make the most of their school libraries to support ambitious student learning. She offers…

Estimating Gear Teeth Stiffness

DEFF Research Database (Denmark)

Pedersen, Niels Leergaard

2013-01-01

The estimation of gear stiffness is important for determining the load distribution between the gear teeth when two sets of teeth are in contact. Two factors have a major influence on the stiffness; firstly the boundary condition through the gear rim size included in the stiffness calculation...... and secondly the size of the contact. In the FE calculation the true gear tooth root profile is applied. The meshing stiffness’s of gears are highly non-linear, it is however found that the stiffness of an individual tooth can be expressed in a linear form assuming that the contact length is constant....

3000-HP Roller Gear Transmission Development Program. Volume 3. Roller Gear Manufacture

Science.gov (United States)

1975-07-01

power is fed through the ramp roller clutch type free- wheel units to spur gears which mesh with the combining spur gear whose centerline is common...when the engine tends to turn faster than the main rotor shaft. It is in the free- wheel mode when the main rotor shaft tends to turn faster than the...gears are cut progrind at this time. Check face runout on each end of largo gears. Not to exceed .002" TIR 30 EBW one end 40 EBW opposite end

49 CFR 230.89 - Reverse gear.

Science.gov (United States)

2010-10-01

... 49 Transportation 4 2010-10-01 2010-10-01 false Reverse gear. 230.89 Section 230.89 Transportation... Reversing Gear § 230.89 Reverse gear. (a) General provisions. Reverse gear, reverse levers, and quadrants... quadrant. Proper counterbalance shall be provided for the valve gear. (b) Air-operated power reverse gear...

Lifestyles and psychosomatic symptoms among elementary school students and junior high school students.

Science.gov (United States)

Isshiki, Yuriko; Morimoto, Kanehisa

2004-05-01

To examine the relationship between lifestyles and psychosomatic symptoms in children, we conducted a self-administered questionnaire survey of elementary school students and junior high school students in Japan. We designed an original questionnaire to investigate the lifestyles and psychosomatic symptoms of children. In 1997, responses to the questionnaires were elicited from public elementary school fourth grade students (then aged 9-10) and public junior high school seventh grade students (then aged 12-13). The survey was repeated annually for three years as the students advanced through school. For both boys and girls, each cross-sectional analysis revealed a strong relationship between lifestyle behaviors and psychosomatic symptoms. Psychosomatic, symptoms scores varied according to daily hours of sleep, eating of breakfast, having strong likes and dislikes of food, bowel habits, and daily hours of television watching. Both boys and girls with "good" lifestyle, behaviors evaluated by the HPI (Health Practice Index) showed lower scores for psychosomatic symptoms. These findings show that the lifestyle behaviors of children are significantly associated with psychosomatic symptoms and suggest that poor lifestyle behaviors are likely to increase physical and psychological health risks.

Mathematic Achievement of Canadian Private School Students

Science.gov (United States)

Cadigan, Francoise Jane; Wei, Yichun; Clifton, Rodney A.

2013-01-01

Very little Canadian research has examined the academic achievement of private school students. Data from The Programme for International Student Assessment (PISA) 2003 were used to examine the achievement of private school students. The study found that private school students outperformed their public school peers. In addition, the students'…

School climate: perceptual differences between students, parents, and school staff

Science.gov (United States)

Ramsey, Christine M.; Spira, Adam P.; Parisi, Jeanine M.; Rebok, George W.

2016-01-01

Research suggests that school climate can have a great impact on student, teacher, and school outcomes. However, it is often assessed as a summary measure, without taking into account multiple perspectives (student, teacher, parent) or examining subdimensions within the broader construct. In this study, we assessed school climate from the perspective of students, staff, and parents within a large, urban school district using multilevel modeling techniques to examine within- and between-school variance. After adjusting for school-level demographic characteristics, students reported worse perceptions of safety and connectedness compared to both parent and staff ratings (all p climate ratings within a school. Understanding how perceptions differ between informants can inform interventions to improve perceptions and prevent adverse outcomes. PMID:28642631

The cycloid Permanent Magnetic Gear

DEFF Research Database (Denmark)

Rasmussen, Peter Omand; Andersen, Torben Ole; Jørgensen, Frank T.

2008-01-01

This paper presents a new permanent-magnet gear based on the cycloid gearing principle. which normally is characterized by an extreme torque density and a very high gearing ratio. An initial design of the proposed magnetic gear was designed, analyzed, and optimized with an analytical model...... regarding torque density. The results were promising as compared to other high-performance magnetic-gear designs. A test model was constructed to verify the analytical model....

A method for gear fatigue life prediction considering the internal flow field of the gear pump

Science.gov (United States)

Shen, Haidong; Li, Zhiqiang; Qi, Lele; Qiao, Liang

2018-01-01

Gear pump is the most widely used volume type hydraulic pump, and it is the main power source of the hydraulic system. Its performance is influenced by many factors, such as working environment, maintenance, fluid pressure and so on. It is different from the gear transmission system, the internal flow field of gear pump has a greater impact on the gear life, therefore it needs to consider the internal hydraulic system when predicting the gear fatigue life. In this paper, a certain aircraft gear pump as the research object, aim at the typical failure forms, gear contact fatigue, of gear pump, proposing the prediction method based on the virtual simulation. The method use CFD (Computational fluid dynamics) software to analyze pressure distribution of internal flow field of the gear pump, and constructed the unidirectional flow-solid coupling model of gear to acquire the contact stress of tooth surface on Ansys workbench software. Finally, employing nominal stress method and Miner cumulative damage theory to calculated the gear contact fatigue life based on modified material P-S-N curve. Engineering practice show that the method is feasible and efficient.

Tooth contact analysis of spur gears. Part 2-Analysis of modified gears

Directory of Open Access Journals (Sweden)

Pop Nicolae

2017-01-01

Full Text Available The misalignment between gears axes or direction deviations of teeth leads accentuate the edge effect, Modified spur gears which localize the initial bearing contact by proper modifications of the lead profile are used to avoid the development of the edge effect. A semi-analytical method was involved to find the contact area, pressures distribution and depth stresses states for the standard gears and gears with modified lead profile. The lead modifications concerned the crowning of the flank surface and the end relieving of the tooth flanks, both being applied to the pinion teeth only.

Variation in obesity among American secondary school students by school and school characteristics.

Science.gov (United States)

O'Malley, Patrick M; Johnston, Lloyd D; Delva, Jorge; Bachman, Jerald G; Schulenberg, John E

2007-10-01

Body mass index (BMI) is known to vary by individual characteristics, but little is known about whether BMI varies by school and by school characteristics. Nationally representative samples of United States schools and students are used to determine the extent to which BMI and percent of students at or above the 85th percentile of BMI vary by school and by school characteristics. Data from the 1991-2004 Monitoring the Future (MTF) study were analyzed in 2006 and 2007. A relatively small proportion of variance in BMI lies between schools; intraclass correlations are on the order of 3%. Still, this is sufficient variation to provide very different environments for students attending schools that are low versus high in average BMI. There is some modest variation by school type (public, Catholic private, non-Catholic private); school size (number of students in the sampled grade); region of the country; and population density. There is more variation as a function of school socioeconomic status (SES) and racial/ethnic composition of the school. School SES in particular was negatively associated with BMI levels, even after controlling individual-level SES and racial/ethnic status. The residual differences in BMI by school suggest that some characteristic of the school and/or community environment--perhaps cultural factors or peer role modeling or differences in school food, beverage, or physical education policies--facilitate obesity in schools with a high concentration of lower socioeconomic students, beyond individual-level factors.

School lunch waste among middle school students: nutrients consumed and costs.

Science.gov (United States)

Cohen, Juliana F W; Richardson, Scott; Austin, S Bryn; Economos, Christina D; Rimm, Eric B

2013-02-01

The National School Lunch Program has been guided by modest nutrient standards, and the palatability of meals, which drives consumption, receives inadequate attention. School food waste can have important nutritional and cost implications for policymakers, students, and their families. Nutrient losses and economic costs associated with school meal waste were examined. The study also assessed if school foods served were valid proxies for foods consumed by students. Plate waste measurements were collected from middle school students in Boston attending two Chef Initiative schools (n=1609) and two control schools (n=1440) during a 2-year pilot study (2007-2009) in which a professional chef trained cafeteria staff to make healthier school meals. The costs associated with food waste were calculated and the percentage of foods consumed was compared with a gold standard of 85% consumption. Analyses were conducted in 2010-2011. Overall, students consumed less than the required/recommended levels of nutrients. An estimated $432,349 of food (26.1% of the total food budget) was discarded by middle school students annually at lunch in these Boston middle schools. For most meal components, substantially less than 85% was consumed. There is substantial food waste among middle school students in Boston. Overall, students' nutrient consumption levels were below school meal standards, and foods served were not valid proxies for foods consumed. The costs associated with discarded foods are high; if translated nationally for school lunches, roughly $1,238,846,400 annually is wasted. Students might benefit if additional focus were given to the quality and palatability of school meals. Copyright © 2013 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.

Working While in Middle School: Student Perceptions of School Climate & Connectedness

Science.gov (United States)

Miller, Sabrena

2016-01-01

Does working during the school year result in lowered perceptions of school climate and connectedness for middle school students? According to outcomes from a Rocky Mountain Region School District's (RMRSD) school climate survey, 20% of their middle school student population works during the school year. Existing literature on youth employment…

Interlocking Molecular Gear Chains Built on Surfaces.

Science.gov (United States)

Zhao, Rundong; Qi, Fei; Zhao, Yan-Ling; Hermann, Klaus E; Zhang, Rui-Qin; Van Hove, Michel A

2018-05-17

Periodic chains of molecular gears in which molecules couple with each other and rotate on surfaces have been previously explored by us theoretically using ab initio simulation tools. On the basis of the knowledge and experience gained about the interactions between neighboring molecular gears, we here explore the transmission of rotational motion and energy over larger distances, namely, through a longer chain of gear-like passive "slave" molecules. Such microscopic gears exhibit quite different behaviors compared to rigid cogwheels in the macroscopic world due to their structural flexibility affecting intermolecular interaction. Here, we investigate the capabilities of such gear chains and reveal the mechanisms of the transmission process in terms of both quantum-level density functional theory (DFT) and simple classical mechanics. We find that the transmission of rotation along gear chains depends strongly on the gear-gear distance: short distances can cause tilting of gears and even irregular "creep-then-jump" (or "stick-slip") motion or expulsion of gears; long gear-gear distances cause weak coupling between gears, slipping and skipping. More importantly, for transmission of rotation at intermediate gear-gear distances, our modeling clearly exhibits the relative roles of several important factors: flexibility of gear arms, axles, and supports, as well as resulting rotational delays, slippages, and thermal and other effects. These studies therefore allow better informed design of future molecular machine components involving motors, gears, axles, etc.

School superintendents' perceptions of schools assisting students in obtaining public health insurance.

Science.gov (United States)

Rickard, Megan L; Price, James H; Telljohann, Susan K; Dake, Joseph A; Fink, Brian N

2011-12-01

Superintendents' perceptions regarding the effect of health insurance status on academics, the role schools should play in the process of obtaining health insurance, and the benefits/barriers to assisting students in enrolling in health insurance were surveyed. Superintendents' basic knowledge of health insurance, the link between health and learning, and specific school system practices for assisting students were also examined. A 4-page questionnaire was sent to a national random sample of public school superintendents using a 4-wave postal mailing. Only 19% of school districts assessed the health insurance status of students. School districts' assistance in helping enroll students in health insurance was assessed using Stages of Change theory; 36% of superintendents' school districts were in the action or maintenance stages. The schools most often made health insurance materials available to parents (53%). The perceived benefits identified by more than 80% of superintendents were to keep students healthier, reduce the number of students with untreated health problems, reduce school absenteeism, and improvement of students' attention/concentration during school. The 2 most common perceived barriers identified by at least 50% of superintendents were not having enough staff or financial resources. Most superintendents believed schools should play a role in helping students obtain health insurance, but the specific role was unclear. Three fourths of superintendents indicated overwhelmingly positive beliefs regarding the effects of health insurance status on students' health and academic outcomes. School personnel and public policy makers can use the results to support collaboration in getting students enrolled in health insurance. © 2011, American School Health Association.

Addressing Student Burnout: What Medical Schools Can Learn From Business Schools.

Science.gov (United States)

Pathipati, Akhilesh S; Cassel, Christine K

2018-03-13

Although they enter school with enthusiasm for a career in medicine, medical students in the United States subsequently report high levels of burnout and disillusionment. As medical school leaders consider how to address this problem, they can look to business schools as one source of inspiration. In this Commentary, the authors argue-based on their collective experience in both medical and business education-that medical schools can draw three lessons from business schools that can help reinvigorate students. First, medical schools should offer more opportunities and dedicated time for creative work. Engaging with diverse challenges promotes intellectual curiosity and can help students maintain perspective. Second, schools should provide more explicit training in resiliency and the management of stressful situations. Many business programs include formal training in how to cope with conflict and how to make high-stakes decisions whereas medical students are typically expected to learn those skills on the job. Finally, medical schools should provide better guidance on practical career considerations like income, lifestyle, and financial skills. Whether in medicine or business, students benefit from open discussions about their personal and professional goals. Medical schools must ensure students have an outlet for those conversations.

Building Astronomy Curriculum to Include the Sight Impaired: Week long summer camp activities for Middle School Students adherent to Washington State Curriculum Standards (EALR's)

Science.gov (United States)

Ramien, Natalie; Loebman, S. R.; Player, V.; Larson, A.; Torcolini, N. B.; Traverse, A.

2011-01-01

Currently astronomy learning is heavily geared towards visual aids; however, roughly 10 million people in North America are sight impaired. Every student should have access to meaningful astronomy curriculum; an understanding of astronomy is an expectation of national and state science learning requirements. Over the last ten years, Noreen Grice has developed Braille and large print astronomy text books aimed at sight impaired learners. We build upon Grice's written work and present here a five day lesson plan that integrates 2D reading with 3D activities. Through this curriculum, students develop an intuitive understanding of astronomical distance, size, composition and lifetimes. We present five distinct lesson modules that can be taught individually or in a sequential form: the planets, our sun, stars, stellar evolution and galaxies. We have tested these modules on sight impaired students and report the results here. Overall, we find the work presented here lends itself equally well to a week long science camp geared toward middle school sight impaired taught by astronomers or as supplemental material integrated into a regular classroom science curriculum. This work was made possible by a 2007 Simple Effective Education and Dissemination (SEED) Grant For Astronomy Researchers, Astronomical Society of the Pacific through funds provided by the Planck Mission, Jet Propulsion Laboratory, California Institute of Technology.

46 CFR 28.885 - Cargo gear.

Science.gov (United States)

2010-10-01

... 46 Shipping 1 2010-10-01 2010-10-01 false Cargo gear. 28.885 Section 28.885 Shipping COAST GUARD... Aleutian Trade Act Vessels § 28.885 Cargo gear. (a) The safe working load (SWL) for the assembled gear... the load the gear is approved to lift, excluding the weight of the gear itself. (b) All wire rope...

Partial tooth gear bearings

Science.gov (United States)

Vranish, John M. (Inventor)

2010-01-01

A partial gear bearing including an upper half, comprising peak partial teeth, and a lower, or bottom, half, comprising valley partial teeth. The upper half also has an integrated roller section between each of the peak partial teeth with a radius equal to the gear pitch radius of the radially outwardly extending peak partial teeth. Conversely, the lower half has an integrated roller section between each of the valley half teeth with a radius also equal to the gear pitch radius of the peak partial teeth. The valley partial teeth extend radially inwardly from its roller section. The peak and valley partial teeth are exactly out of phase with each other, as are the roller sections of the upper and lower halves. Essentially, the end roller bearing of the typical gear bearing has been integrated into the normal gear tooth pattern.

Modelling the Meshing of Cycloidal Gears

Directory of Open Access Journals (Sweden)

Nachimowicz Jerzy

2016-06-01

Full Text Available Cycloidal drives belong to the group of planetary gear drives. The article presents the process of modelling a cycloidal gear. The full profile of the planetary gear is determined from the following parameters: ratio of the drive, eccentricity value, the equidistant (ring gear roller radius, epicycloid reduction ratio, roller placement diameter in the ring gear. Joong-Ho Shin’s and Soon-Man Kwon’s article (Shin and Know, 2006 was used to determine the profile outline of the cycloidal planetary gear lobes. The result was a scatter chart with smooth lines and markers, presenting the full outline of the cycloidal gear.

Stuck in gear: age-related loss of variable gearing in skeletal muscle.

Science.gov (United States)

Holt, Natalie C; Danos, Nicole; Roberts, Thomas J; Azizi, Emanuel

2016-04-01

Skeletal muscles power a broad diversity of animal movements, despite only being able to produce high forces over a limited range of velocities. Pennate muscles use a range of gear ratios, the ratio of muscle shortening velocity to fiber shortening velocity, to partially circumvent these force-velocity constraints. Muscles operate with a high gear ratio at low forces; fibers rotate to greater angles of pennation, enhancing velocity but compromising force. At higher forces, muscles operate with a lower gear ratio; fibers rotate little so limiting muscle shortening velocity, but helping to preserve force. This ability to shift gears is thought to be due to the interplay of contractile force and connective tissue constraints. In order to test this hypothesis, gear ratios were determined in the medial gastrocnemius muscles of both healthy young rats, and old rats where the interaction between contractile and connective tissue properties was assumed to be disrupted. Muscle fiber and aponeurosis stiffness increased with age (PGear ratio decreased with increasing force in young (Pgearing is lost in old muscle. These findings support the hypothesis that variable gearing results from the interaction between contractile and connective tissues and suggest novel explanations for the decline in muscle performance with age. © 2016. Published by The Company of Biologists Ltd.

Authoritative School Climate and High School Student Risk Behavior: A Cross-sectional Multi-level Analysis of Student Self-Reports.

Science.gov (United States)

Cornell, Dewey; Huang, Francis

2016-11-01

Many adolescents engage in risk behaviors such as substance use and aggression that jeopardize their healthy development. This study tested the hypothesis that an authoritative school climate characterized by strict but fair discipline and supportive teacher-student relationships is conducive to lower risk behavior for high school students. Multilevel logistic regression models were used to analyze cross-sectional, student-report survey data from a statewide sample of 47,888 students (50.6 % female) in 319 high schools. The students included ninth (26.6 %), tenth (25.5 %), eleventh (24.1 %) and twelfth (23.8 %) grade with a racial/ethnic breakdown of 52.2 % White, 18.0 % Black, 13.1 % Hispanic, 5.9 % Asian, and 10.8 % reporting another or two or more race/ethnicities. Schools with an authoritative school climate had lower levels of student-reported alcohol and marijuana use; bullying, fighting, and weapon carrying at school; interest in gang membership; and suicidal thoughts and behavior. These results controlled for demographic variables of student gender, race, grade, and parent education level as well as school size, percentage of minority students, and percentage of low income students. Overall, these findings add new evidence that an authoritative school climate is associated with positive student outcomes.

Student and school factors associated with school suspension: A multilevel analysis of students in Victoria, Australia and Washington State, United States

Science.gov (United States)

Sheryl, A. Hemphill; Stephanie, M. Plenty; Herrenkohl, Todd I.; Toumbourou, John W.; Catalano, Richard F.

2014-01-01

One of the common issues schools face is how best to handle challenging student behaviors such as violent behavior, antisocial behavior, bullying, school rule violations, and interrupting other students’ learning. School suspension may be used to remove students engaging in challenging behaviors from the school for a period of time. However, the act of suspending students from school may worsen rather than improve their behavior. Research shows that suspensions predict a range of student outcomes, including crime, delinquency, and drug use. It is therefore crucial to understand the factors associated with the use of school suspension, particularly in sites with different policy approaches to problem behaviors. This paper draws on data from state-representative samples of 3,129 Grade 7 and 9 students in Washington State, United States and Victoria, Australia sampled in 2002. Multilevel modeling examined student and school level factors associated with student-reported school suspension. Results showed that both student (being male, previous student antisocial and violent behavior, rebelliousness, academic failure) and school (socioeconomic status of the school, aggregate measures of low school commitment) level factors were associated with school suspension and that the factors related to suspension were similar in the two states. The implications of the findings for effective school behavior management policy are that, rather than focusing only on the student, both student and school level factors need to be addressed to reduce the rates of school suspension. PMID:24860205

Design and construction of permanent magnetic gears

DEFF Research Database (Denmark)

Jørgensen, Frank Thorleif

/l]. Measurement from this gear has resulted in a measured total torque density of 23 [Nm/l]. Mechanical versions of this gear type are found with total torque density in the 16 to 31 [Nm/l] range. The third and last gear technology that is investigated is a gear that reminds of a planetary gear. Research shows......This thesis deals with design and development of permanent magnetic gears. The goal of this thesis is to develop knowledge and calculation software for magnetic gears. They use strong NdFeB permanent magnets and a new magnetic gear technology, which will be a serious alternative to classical...... mechanical gears. The new magnetic gear will have a high torque density1 relationship –high efficiency and are maintenance free. In this project was manufactured two test gears which is tested and verified with models developed in this project. Present technological status for magnetic gears is introduced...

School violence and bullying among sexual minority high school students, 2009-2011.

Science.gov (United States)

O'Malley Olsen, Emily; Kann, Laura; Vivolo-Kantor, Alana; Kinchen, Steve; McManus, Tim

2014-09-01

School-based victimization has short- and long-term implications for the health and academic lives of sexual minority students. This analysis assessed the prevalence and relative risk of school violence and bullying among sexual minority and heterosexual high school students. Youth Risk Behavior Survey data from 10 states and 10 large urban school districts that assessed sexual identity and had weighted data in the 2009 and/or 2011 cycle were combined to create two large population-based data sets, one containing state data and one containing district data. Prevalence of physical fighting, being threatened or injured with a weapon, weapon carrying, and being bullied on school property and not going to school because of safety concerns was calculated. Associations between these behaviors and sexual identity were identified. In the state data, sexual minority male students were at greater risk for being threatened or injured with a weapon, not going to school because of safety concerns and being bullied than heterosexual male students. Sexual minority female students were at greater risk than heterosexual female students for all five behaviors. In the district data, with one exception, sexual minority male and female students were at greater risk for all five behaviors than heterosexual students. Sexual minority students still routinely experience more school victimization than their heterosexual counterparts. The implementation of comprehensive, evidence-based programs and policies has the ability to reduce school violence and bullying, especially among sexual minority students. Published by Elsevier Inc.

Middle school student perceptions of school lunch following revised federal school meal guidelines

Science.gov (United States)

This study assessed student perceptions of school meals under the new federal meal patterns for the National School Lunch Program (NSLP). Student feedback is instrumental in developing strategies to increase and maintain NSLP participation, satisfaction, and ultimately provide students with a health...

School Related Alienation: Perceptions of Secondary School Students.

Science.gov (United States)

Kunkel, Richard C.; And Others

Responses to questionnaires administered to 10,000 senior high school students to ascertain their feelings of alienation as related to their schools are presented. The questionnaire items concerned: School as an Institution, The School as Teacher, Authority--Autonomy, and Parental Interest in School. The findings that resulted from the…

Students' approaches to medical school choice: relationship with students' characteristics and motivation.

Science.gov (United States)

Wouters, Anouk; Croiset, Gerda; Schripsema, Nienke R; Cohen-Schotanus, Janke; Spaai, Gerard W G; Hulsman, Robert L; Kusurkar, Rashmi A

2017-06-12

The aim was to examine main reasons for students' medical school choice and their relationship with students' characteristics and motivation during the students' medical study. In this multisite cross-sectional study, all Year-1 and Year-4 students who had participated in a selection procedure in one of the three Dutch medical schools included in the study were invited to complete an online survey comprising personal data, their main reason for medical school choice and standard, validated questionnaires to measure their strength of motivation (Strength of Motivation for Medical School-Revised) and autonomous and controlled type of motivation (Academic Self-regulation Questionnaire). Four hundred seventy-eight students participated. We performed frequency analyses on the reasons for medical school choice and regression analyses and ANCOVAs to study their associations with students' characteristics and motivation during their medical study. Students indicated 'city' (Year-1: 24.7%, n=75 and Year-4: 36.0%, n=52) and 'selection procedure' (Year-1: 56.9%, n=173 and Year-4: 46.9%, n=68) as the main reasons for their medical school choice. The main reasons were associated with gender, age, being a first-generation university student, ethnic background and medical school, and no significant associations were found between the main reasons and the strength and type of motivation during the students' medical study. Most students had based their medical school choice on the selection procedure. If medical schools desire to achieve a good student-curriculum fit and attract a diverse student population aligning the selection procedure with the curriculum and taking into account various students' different approaches is important.

Systems and Methods for Implementing Bulk Metallic Glass-Based Strain Wave Gears and Strain Wave Gear Components

Science.gov (United States)

Hofmann, Douglas C. (Inventor); Wilcox, Brian (Inventor)

2016-01-01

Bulk metallic glass-based strain wave gears and strain wave gear components. In one embodiment, a strain wave gear includes: a wave generator; a flexspline that itself includes a first set of gear teeth; and a circular spline that itself includes a second set of gear teeth; where at least one of the wave generator, the flexspline, and the circular spline, includes a bulk metallic glass-based material.

Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear

Directory of Open Access Journals (Sweden)

Pedro Javier Gamez-Montero

2017-09-01

Full Text Available The trochoidal-gear technology has been growing in groundbreaking fields. Forthcoming applications are demanding to this technology a step forward in the conceiving stage of positive displacement machines. The compendium of the qualities and the inherent characteristics of trochoidal-gear technology, especially towards the gerotor pump, together with scale/size factor and magnetic-driven transmission has led to the idea of a magnet-sleeve-sealed variable flow mini trochoidal-gear pump. From its original concept, to the last phase of the design development, the proof of concept, this new product will intend to overcome problems such as noise, vibration, maintenance, materials, and dimensions. The paper aims to show the technological path followed from the concept, design, and model, to the manufacture of the first prototype, where the theoretical and numerical approaches are not always directly reflected in the prototype performance results. Early in the design process, from a standard-commercial sintered metal mini trochoidal-gear unit, fundamental characteristics and dimensional limitations have been evaluated becoming the strategic parameters that led to its configuration. The main technical challenge to confront is being sealed with non-exterior driveshaft, ensuring that the whole interior is filled and wetted with working fluid and helping the hydrodynamic film formation, the pumping effect, and the heat dissipation. Subsequently, the mini pump architecture, embodiment, methodology, materials, and manufacture are presented. The trend of applications of polymer composite materials and their benefits wanted to be examined with this new mini pump prototype, and a pure polyoxymethylene mini trochoidal-gear set has been designed and manufactured. Finally, both the sintered and the polymer trochoidal-gear units have been experimentally tested in an in-house full-instrumented mini test bench. Although the main goal of the presented work is the

Perceptions about interpersonal relationships and school environment among middle school students with asthma.

Science.gov (United States)

Rhee, Hyekyun; McQuillan, Brenda; Chen, Ding-Geng; Atis, Shannska

2017-11-01

To examine interpersonal relationships involving peers and teachers and perceptions about school environment among middle school students with asthma in comparison to their healthy counterparts. The study also assesses asthma prevalence in a large sample of middle school students representing different geographic locations. Cross-sectional data were collected from 1059 middle school students in grades 6-8 enrolled in schools in a northeastern region of the United States. Students reported their chronic health conditions including asthma and completed questionnaires measuring perceptions about their relationships with peers and teachers as well as school environment. Analyses of covariance (ANCOVAs) were used to compare students with asthma and their healthy counterparts in the study variables. Asthma was reported by 16.5% of the sample (n = 169). The rate was higher among minority students (23%) than their white counterparts (15%). Greater proportion of urban students (28%) reported asthma than rural (18%) and suburban (14%) students. Students with asthma reported significantly poorer relationships with peers (B = -1.74, p asthma prevalence was substantially higher than the national average of adolescent asthma, particularly those residing in the urban area. Poor perceptions of interpersonal relationships with peers and teachers among students with asthma may indicate compromised quality of life. Suboptimal interpersonal relationships and school environment need to be identified and adequately addressed, given their implications for asthma management at the school setting among middle school students.

Gear Tooth Wear Detection Algorithm

Science.gov (United States)

Delgado, Irebert R.

2015-01-01

Vibration-based condition indicators continue to be developed for Health Usage Monitoring of rotorcraft gearboxes. Testing performed at NASA Glenn Research Center have shown correlations between specific condition indicators and specific types of gear wear. To speed up the detection and analysis of gear teeth, an image detection program based on the Viola-Jones algorithm was trained to automatically detect spiral bevel gear wear pitting. The detector was tested using a training set of gear wear pictures and a blind set of gear wear pictures. The detector accuracy for the training set was 75 percent while the accuracy for the blind set was 15 percent. Further improvements on the accuracy of the detector are required but preliminary results have shown its ability to automatically detect gear tooth wear. The trained detector would be used to quickly evaluate a set of gear or pinion pictures for pits, spalls, or abrasive wear. The results could then be used to correlate with vibration or oil debris data. In general, the program could be retrained to detect features of interest from pictures of a component taken over a period of time.

Advanced Face Gear Surface Durability Evaluations

Science.gov (United States)

Lewicki, David G.; Heath, Gregory F.

2016-01-01

The surface durability life of helical face gears and isotropic super-finished (ISF) face gears was investigated. Experimental fatigue tests were performed at the NASA Glenn Research Center. Endurance tests were performed on 10 sets of helical face gears in mesh with tapered involute helical pinions, and 10 sets of ISF-enhanced straight face gears in mesh with tapered involute spur pinions. The results were compared to previous tests on straight face gears. The life of the ISF configuration was slightly less than that of previous tests on straight face gears. The life of the ISF configuration was slightly greater than that of the helical configuration.

Schools or Students? Identifying High School Effects on Student Suspensions

Science.gov (United States)

Baker-Smith, E. Christine

2015-01-01

Evidence is clear that discipline in high school is associated with negative outcomes across the life course. Not only are suspensions related to declining academic trajectories during high school in the form of attendance and academic achievement, students suspended once are also more likely to be suspended again and also substantially increase…

Bullying among High School Students

Science.gov (United States)

Nursel TÜRKMEN, Delia; Halis DOKGÖZ, Mihai; Semra AKGÖZ, Suzana; Bülent EREN, Bogdan Nicolae; Pınar VURAL, Horatiu; Oğuz POLAT, Horatiu

2013-01-01

ABSTRACT Objective: The main aim of this research is to investigate the prevalence of bullying behaviour, its victims and the types of bullying and places of bullying among 14-17 year-old adolescents in a sample of school children in Bursa, Turkey. Methodology: A cross-sectional survey questionnaire was conducted among class 1 and class 2 high school students for identification bullying. Results: Majority (96.7%) of the students were involved in bullying behaviours as aggressors or victims. For a male student, the likelihood of being involved in violent behaviours was detected to be nearly 8.4 times higher when compared with a female student. Conclusion: a multidisciplinary approach involving affected children, their parents, school personnel, media, non-govermental organizations, and security units is required to achieve an effective approach for the prevention of violence targeting children in schools as victims and/or perpetrators. PMID:24371478

On gear tooth stiffness evaluation

DEFF Research Database (Denmark)

Pedersen, Niels Leergaard; Jørgensen, Martin Felix

2014-01-01

The estimation of gear stiffness is important for determining the load distribution between the gear teeth when two sets of teeth are in contact. Two factors have a major influence on the stiffness; firstly the boundary condition through the gear rim size included in the stiffness calculation...

Technologies for the marking of fishing gear to identify gear components entangled on marine animals and to reduce abandoned, lost or otherwise discarded fishing gear.

Science.gov (United States)

He, Pingguo; Suuronen, Petri

2018-04-01

Fishing gears are marked to establish and inform origin, ownership and position. More recently, fishing gears are marked to aid in capacity control, reduce marine litter due to abandoned, lost or otherwise discarded fishing gear (ALDFG) and assist in its recovery, and to combat illegal, unreported and unregulated (IUU) fishing. Traditionally, physical marking, inscription, writing, color, shape, and tags have been used for ownership and capacity purposes. Buoys, lights, flags, and radar reflectors are used for marking of position. More recently, electronic devices have been installed on marker buoys to enable easier relocation of the gear by owner vessels. This paper reviews gear marking technologies with focus on coded wire tags, radio frequency identification tags, Automatic Identification Systems, advanced electronic buoys for pelagic longlines and fish aggregating devices, and re-location technology if the gear becomes lost. Copyright © 2018 Elsevier Ltd. All rights reserved.

DESIGN FOR A BI-PLANETARY GEAR TRAIN

Directory of Open Access Journals (Sweden)

Józef DREWNIAK

2016-06-01

Full Text Available The article presents the design for a bi-planetary gear train. The project description is supplemented with calculations of kinematics, statics and meshing efficiency of the gear wheels included in the gear train. Excluded are calculations of strength and geometry of gears, shaft and rolling bearing, since they are similar to classical calculations for planetary gears. An assembly drawing in 2D and assembly drawings in 3D of the designed bi-planetary gear train are also shown. This gear train will form the main element of the research in hand.

29 CFR 1918.54 - Rigging gear.

Science.gov (United States)

2010-07-01

... 29 Labor 7 2010-07-01 2010-07-01 false Rigging gear. 1918.54 Section 1918.54 Labor Regulations...) SAFETY AND HEALTH REGULATIONS FOR LONGSHORING Vessel's Cargo Handling Gear § 1918.54 Rigging gear. (a... other alternate device shall be provided to allow trimming of the gear and to prevent employees from...

School lunch and snacking patterns among high school students: Associations with school food environment and policies

Directory of Open Access Journals (Sweden)

Story Mary

2005-10-01

Full Text Available Abstract Objectives This study examined associations between high school students' lunch patterns and vending machine purchases and the school food environment and policies. Methods A randomly selected sample of 1088 high school students from 20 schools completed surveys about their lunch practices and vending machine purchases. School food policies were assessed by principal and food director surveys. The number of vending machines and their hours of operation were assessed by trained research staff. Results Students at schools with open campus policies during lunchtime were significantly more likely to eat lunch at a fast food restaurant than students at schools with closed campus policies (0.7 days/week vs. 0.2 days/week, p Conclusion School food policies that decrease access to foods high in fats and sugars are associated with less frequent purchase of these items in school among high school students. Schools should examine their food-related policies and decrease access to foods that are low in nutrients and high in fats and sugars.

Sex differences and violence among primary school students

Directory of Open Access Journals (Sweden)

Marković Živorad M.

2017-01-01

Full Text Available This is the micro research which studied the connection between gender and violence between older primary school students with the goal of discovering exposure of gender members to violence in school context and the ways of reaction to the violence. The researchers from different scientific disciplines have been permanently involved in studying the problem of violence for more than a decade with the goal to lessen the high percentage of violence in schools. In this sense, this research, with its range and character, represents the contribution in discovering characteristics of violence in schools in one specific local area, which could fill in the wholeness of this phenomenon. The research involved students of the final grade of primary school on the territory of the municipality of Svilajnac (which is in central part of Serbia and it was performed in December 2015. 236 students were surveyed. The survey consisted of the following questions a which questioned the social matrix of families in which the students live b which questioned presence and frequency of different types of violence between students in primary schools c which questioned the attitudes of students of both genders about the violence, exposure to violence in school and the ways of reacting to violence. In the frame of quantitative analysis of the data the following was applied: percentual research of frequencies and Pierson's hi-square test (x2 for testing of hyphothesis about the significance of differences. The main results of the research showed: a There is no statistically significant difference in exposure to violence in school between male and female students of primary school age; both genders are exposed to verbal and physical violence and male students (45.7% are more exposed to physical, and female students (38.3% are more exposed to verbal violence. bThere is no statistically significant difference in the readiness of students considering their gender to help another

Greenhouse Schools: How Schools Can Build Cultures Where Teachers and Students Thrive

Science.gov (United States)

TNTP, 2012

2012-01-01

Successful teachers make successful schools. Yet some schools are better than others at accelerating student learning by developing and keeping great teachers, even compared to schools that serve the same population of students and have access to the same resources. These schools are called "greenhouse schools"--schools with carefully…

The Contribution of Student Perceptions of School Climate to Understanding the Disproportionate Punishment of African American Students in a Middle School

Science.gov (United States)

Shirley, Erica L. M.; Cornell, Dewey G.

2012-01-01

This study investigated the contribution of student perceptions of school climate to racial differences in school discipline. Four hundred middle school students completed a school climate survey. Compared to Caucasian students, African-American students were referred to the office for discipline three times as frequently and received five times…

Shuttle Rudder/Speed Brake Power Drive Unit (PDU) Gear Scuffing Tests With Flight Gears

Science.gov (United States)

Proctor, Margaret P.; Oswald, Fred B.; Krants, Timothy L.

2005-01-01

Scuffing-like damage has been found on the tooth surfaces of gears 5 and 6 of the NASA space shuttle rudder/speed brake power drive unit (PDU) number 2 after the occurrence of a transient back-driving event in flight. Tests were conducted using a pair of unused spare flight gears in a bench test at operating conditions up to 2866 rpm and 1144 in.-lb at the input ring gear and 14,000 rpm and 234 in.-lb at the output pinion gear, corresponding to a power level of 52 hp. This test condition exceeds the maximum estimated conditions expected in a backdriving event thought to produce the scuffing damage. Some wear marks were produced, but they were much less severe than the scuffing damaged produced during shuttle flight. Failure to produce scuff damage like that found on the shuttle may be due to geometrical variations between the scuffed gears and the gears tested herein, more severe operating conditions during the flight that produced the scuff than estimated, the order of the test procedures, the use of new hydraulic oil, differences between the dynamic response of the flight gearbox and the bench-test gearbox, or a combination of these. This report documents the test gears, apparatus, and procedures, summarizes the test results, and includes a discussion of the findings, conclusions, and recommendations.

29 CFR 1919.19 - Gear requiring welding.

Science.gov (United States)

2010-07-01

... 29 Labor 7 2010-07-01 2010-07-01 false Gear requiring welding. 1919.19 Section 1919.19 Labor... (CONTINUED) GEAR CERTIFICATION Certification of Vessels' Cargo Gear § 1919.19 Gear requiring welding. Chains or other gear which have been lengthened, altered or repaired by welding shall be properly heat...

We love our school toilets: involving primary school students in improving their school toilets.

Science.gov (United States)

Senior, Elizabeth

2014-03-01

This article reports on the planning, implementation and evaluation of an intervention to improve school students' experience of using the school toilet in a primary school in Melbourne, Australia. 20 students from grades 2-6 participated in focus groups, to discuss what they valued about the school and raise awareness of issues they were not happy about. A common theme from all of the focus groups was that students reported avoiding use of the school toilets. Using the ideas generated from the focus groups, the student council (with input from staff), developed a self-administered pre- and post-test questionnaire. This was given to 220 students in grades 1-4, aged 6-10 years. Improvements suggested by the students were made to the toilet block, and then a post-test was administered. Independent t tests were conducted. The pre-test indicated that 71% of girls and 65% of boys feared the behaviour of other students in the toilet. Overwhelmingly, the qualitative comments focused on poor student behaviour in the toilets, with lack of privacy due to student misbehaviour mentioned in 90% of the comments. After the toilets were revamped, the greatest gains were made in students' attitudes toward the toilets, with a 37% increase in students who indicated they now liked the toilet facility. Incidents of vandalism also decreased; however, student misconduct in the toilets was still regarded as a problem. Involving students in refurbishing their toilets improved how students viewed the toilets and reduced vandalism; however, a different intervention is required to change inappropriate behaviours in the toilet.

Bullying climate and school engagement in ninth-grade students.

Science.gov (United States)

Mehta, Sharmila B; Cornell, Dewey; Fan, Xitao; Gregory, Anne

2013-01-01

Many authorities agree that bullying has a widespread impact on school climate, affecting bystanders as well as victims. This study tested the contention that a climate of bullying can have a schoolwide impact on student engagement in school. Hierarchical linear modeling assessed the relations between student perception of bullying climate and student engagement at the individual and school level in a statewide sample of 7058 ninth graders randomly selected from 289 schools participating in the Virginia High School Safety Study. Student engagement was assessed by self-report scales measuring commitment to school and involvement in school activities. Individual differences in perception of school climate characterized by bullying were associated with lower commitment to school, but not less involvement in school activities. School-level differences in student perceptions of bullying climate were associated with both lower commitment to school and less involvement in school activities, after controlling for the effects of gender, race, school size, proportion of ethnic minority students in the school, and individual-level perception of bullying climate. Efforts to improve student engagement should consider the schoolwide impact of bullying on all students. © 2013, American School Health Association.

Freshman Year Dropouts: Interactions between Student and School Characteristics and Student Dropout Status

Science.gov (United States)

Zvoch, Keith

2006-01-01

Data from a large school district in the southwestern United States were analyzed to investigate relations between student and school characteristics and high school freshman dropout patterns. Application of a multilevel logistic regression model to student dropout data revealed evidence of school-to-school differences in student dropout rates and…

How Students Utilize and Perceive Their School Library

Science.gov (United States)

Bleidt, Shirley A.

2011-01-01

School library usage and middle school students' perceptions of the usefulness of their school library were examined in this study. 1,509 predominately Hispanic students attending rural public schools participated by completing an online survey regarding their school libraries. The vast majority of students surveyed reported that they used their…

50 CFR 697.23 - Restricted gear areas.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Restricted gear areas. 697.23 Section 697... Measures § 697.23 Restricted gear areas. (a) Resolution of lobster gear conflicts with fisheries managed...) Restricted Gear Area I—(1) Duration—(i) Mobile Gear. From October 1 through June 15 of each fishing year, no...

Investigation on wear characteristic of biopolymer gear

Science.gov (United States)

Ghazali, Wafiuddin Bin Md; Daing Idris, Daing Mohamad Nafiz Bin; Sofian, Azizul Helmi Bin; Basrawi, Mohamad Firdaus bin; Khalil Ibrahim, Thamir

2017-10-01

Polymer is widely used in many mechanical components such as gear. With the world going to a more green and sustainable environment, polymers which are bio based are being recognized as a replacement for conventional polymers based on fossil fuel. The use of biopolymer in mechanical components especially gear have not been fully explored yet. This research focuses on biopolymer for spur gear and whether the conventional method to investigate wear characteristic is applicable. The spur gears are produced by injection moulding and tested on several speeds using a custom test equipment. The wear formation such as tooth fracture, tooth deformation, debris and weight loss was observed on the biopolymer spur gear. It was noted that the biopolymer gear wear mechanism was similar with other type of polymer spur gears. It also undergoes stages of wear which are; running in, linear and rapid. It can be said that the wear mechanism of biopolymer spur gear is comparable to fossil fuel based polymer spur gear, thus it can be considered to replace polymer gears in suitable applications.

Student Achievement in Title I Schools

Science.gov (United States)

Diaz, Abby T.

2017-01-01

This researcher seeks to answer the following question: How did two elementary Title I schools, identified as "high performing" on the first Smarter Balanced assessment, address elements of Maslow's hierarchy of needs when developing school-wide initiatives to enhance student achievement? Many students in Title I schools face barriers to…

Transformation of Teaching Quality in Secondary School Education: Teachers' Conception

Science.gov (United States)

Ojo, O. A; Adu, E. O

2017-01-01

Teaching is a versatile and valued exercise that is geared towards bringing about achievement in students' learning. In view of the importance of teaching, there is need for it to be effective and of good quality. Education in secondary school within South Africa is seen as an imperative sub-sector in the educational system that aids the growth of…

Relations between the school physical environment and school social capital with student physical activity levels.

Science.gov (United States)

Button, Brenton; Trites, Stephen; Janssen, Ian

2013-12-17

The physical and social environments at schools are related to students' moderate-to-vigorous physical activity (MVPA) levels. The purpose of this study was to explore the interactive effects of the school physical environment and school social capital on the MVPA of students while at school. Data from 18,875 grade 6-10 students from 331 schools who participated in the 2009/10 Canadian Health Behaviour in School-Aged Children survey were analyzed using multi-level regression. Students answered questions on the amount of time they spend in MVPA at school and on their school's social capital. Administrator reports were used to create a physical activity related physical environment score. The school physical environment score was positively associated with student MVPA at school (β = 0.040, p < .005). The association between the school social capital and MVPA was also positive (β = 0.074, p < .001). The difference in physical environments equated to about 20 minutes/week of MVPA for students attending schools with the lowest number of physical environment features and about 40 minutes/week for students attending schools with the lowest school social capital scores by comparison to students attending schools with the highest scores. The findings suggest that school social capital may be a more important factor in increasing students MVPA than the school physical environment. The results of this study may help inform interventions aimed at increasing student physical activity levels.

High School Physics Students' Personal Epistemologies and School Science Practice

Science.gov (United States)

Alpaslan, Muhammet Mustafa; Yalvac, Bugrahan; Loving, Cathleen

2017-11-01

This case study explores students' physics-related personal epistemologies in school science practices. The school science practices of nine eleventh grade students in a physics class were audio-taped over 6 weeks. The students were also interviewed to find out their ideas on the nature of scientific knowledge after each activity. Analysis of transcripts yielded several epistemological resources that students activated in their school science practice. The findings show that there is inconsistency between students' definitions of scientific theories and their epistemological judgments. Analysis revealed that students used several epistemological resources to decide on the accuracy of their data including accuracy via following the right procedure and accuracy via what the others find. Traditional, formulation-based, physics instruction might have led students to activate naive epistemological resources that prevent them to participate in the practice of science in ways that are more meaningful. Implications for future studies are presented.

Improving bending stress in spur gears using asymmetric gears and shape optimization

DEFF Research Database (Denmark)

Pedersen, Niels Leergaard

2010-01-01

Bending stress plays a significant role in gear design wherein its magnitude is controlled by the nominal bending stress and the stress concentration due to the geometrical shape. The bending stress is indirectly related to shape changes made to the cutting tool. This work shows that the bending...... stress can be reduced significantly by using asymmetric gear teeth and by shape optimizing the gear through changes made to the tool geometry. However, to obtain the largest possible stress reduction a custom tool must be designed depending on the number of teeth, but the stress reductions found...

School Safety Concerns All Students.

Science.gov (United States)

Henderson, Megan

1999-01-01

Suggests that school safety is an issue that concerns all students. Discusses how the staff of the Rockwood South (Missouri) "RAMpage" covered the shootings at Columbine High School in a 14-page issue and in follow-up issues. Suggests that the student newspaper covered the controversial topic in an appropriate, tasteful manner. (RS)

Middle School Students' Perceptions of the Quality of School Life in Ankara

Science.gov (United States)

Eres, Figen; Bilasa, Pinar

2016-01-01

The aim of this research is to measure the perception of middle school students in Ankara regarding the quality of school life. According to the findings obtained, the students have moderate level perceptions about the quality of school life. Their perceptions about sub-dimensions vary. While the students have the highest perceptions about…

Student Voices in School-Based Assessment

Science.gov (United States)

Tong, Siu Yin Annie; Adamson, Bob

2015-01-01

The value of student voices in dialogues about learning improvement is acknowledged in the literature. This paper examines how the views of students regarding School-based Assessment (SBA), a significant shift in examination policy and practice in secondary schools in Hong Kong, have largely been ignored. The study captures student voices through…

School Uniform Policies: Students' Views of Effectiveness.

Science.gov (United States)

McCarthy, Teresa M.; Moreno, Josephine

2001-01-01

Focus-group interviews of New York City middle-school students about their perceptions of the effectiveness of the school-uniform policy. Finds that students' perceptions of the effects of school-uniform policy on school culture varied considerably with those intended by the principal. (Contains 40 references.) (PKP)

Design of Gear Churning Power Loss Measurement Device

OpenAIRE

Wang Bin; Zhou Ya Jie; Wang Ping

2017-01-01

To explore the impacts of gear churning power losses, a research was conducted to achieve the internal causes of power losses of churning gear by designing a gear churning power losses measurement device. The gear churning power losses could be influenced by different gear modules, the number of teeth and the axial position of gear. Finally, the impacts of gear churning power losses were discussed by comparing experimental data and theoretical data.

UNDERSTANDING STUDENT ENGAGEMENT WITH SCHOOL: A LITERATURE REVIEW

Directory of Open Access Journals (Sweden)

Viorel ROBU

2014-11-01

Full Text Available In recent years, there has been an increasing amount of literature on student engagement with school. There is a large agreement on the predictive role that individual differences in student engagement with school plays in relation to a wide range of educational outcomes and to general adjustment. Numerous empirical studies have attempted to explain how individual characteristics of students (e.g., gender, academic motivation, school-related self-efficacy etc., family environment (e.g., parent social support, aspirations of parents concerning the adolescents’ school trajectory or quality of adolescent-parents relationship, and the school/classroom climate (e.g., social support from teachers and peers, autonomy granted to students, quality of instructional practices etc. impact student engagement with school and the academic achievement/performance. This paper summarizes the existing literature on antecedents and positive outcomes of student engagement with school. The implications for educational practice and policy makers are discussed.

Intelligent Test Mechanism Design of Worn Big Gear

Directory of Open Access Journals (Sweden)

Hong-Yu LIU

2014-10-01

Full Text Available With the continuous development of national economy, big gear was widely applied in metallurgy and mine domains. So, big gear plays an important role in above domains. In practical production, big gear abrasion and breach take place often. It affects normal production and causes unnecessary economic loss. A kind of intelligent test method was put forward on worn big gear mainly aimed at the big gear restriction conditions of high production cost, long production cycle and high- intensity artificial repair welding work. The measure equations transformations were made on involute straight gear. Original polar coordinate equations were transformed into rectangular coordinate equations. Big gear abrasion measure principle was introduced. Detection principle diagram was given. Detection route realization method was introduced. OADM12 laser sensor was selected. Detection on big gear abrasion area was realized by detection mechanism. Tested data of unworn gear and worn gear were led in designed calculation program written by Visual Basic language. Big gear abrasion quantity can be obtained. It provides a feasible method for intelligent test and intelligent repair welding on worn big gear.

New Siemens applications for designing bevel gears

Science.gov (United States)

Goanta, A. M.; Dumitrache, P.

2017-08-01

The current situation in the design of gearings is different from software to software and in some cases requires specialized settings with or without additional costs. There are two ways of generating evolving tooting: one is based on the designer’s solid knowledge of geometry and gearing and the other is based on a series of automation subprograms for 3D modelling of gears. The first method is a general one, applicable to all design software that is based on generating a curve evolving specific to a tooth flank, continued with the construction of the symmetrical flank, the pattern multiplication of circular type around the center of the gear and finally generation of the three-dimensional characteristic of each individual tooth. The second method is much faster and requires only general knowledge about the gear but sufficiently advanced to allow permanent dialogue with the subprogram for generating cone gears. Absolute novelty items are brought about by the new NX design applications that lead to getting gears with curved teeth. In conclusion the paper shows how different variants of bevel gears are generated using various subprograms or performance settings, installed over the SIEMENS NX. An essential component of the paper is highlighting generation capacity of gears and gearing intended for predefined types of gear cutting machines such as those for Gleason and Oerlikon teeth.

Medical Student Perceptions of the Learning Environment in Medical School Change as Students Transition to Clinical Training in Undergraduate Medical School.

Science.gov (United States)

Dunham, Lisette; Dekhtyar, Michael; Gruener, Gregory; CichoskiKelly, Eileen; Deitz, Jennifer; Elliott, Donna; Stuber, Margaret L; Skochelak, Susan E

2017-01-01

Phenomenon: The learning environment is the physical, social, and psychological context in which a student learns. A supportive learning environment contributes to student well-being and enhances student empathy, professionalism, and academic success, whereas an unsupportive learning environment may lead to burnout, exhaustion, and cynicism. Student perceptions of the medical school learning environment may change over time and be associated with students' year of training and may differ significantly depending on the student's gender or race/ethnicity. Understanding the changes in perceptions of the learning environment related to student characteristics and year of training could inform interventions that facilitate positive experiences in undergraduate medical education. The Medical School Learning Environment Survey (MSLES) was administered to 4,262 students who matriculated at one of 23 U.S. and Canadian medical schools in 2010 and 2011. Students completed the survey at the end of each year of medical school as part of a battery of surveys in the Learning Environment Study. A mixed-effects longitudinal model, t tests, Cohen's d effect size, and analysis of variance assessed the relationship between MSLES score, year of training, and demographic variables. After controlling for gender, race/ethnicity, and school, students reported worsening perceptions toward the medical school learning environment, with the worst perceptions in the 3rd year of medical school as students begin their clinical experiences, and some recovery in the 4th year after Match Day. The drop in MSLES scores associated with the transition to the clinical learning environment (-0.26 point drop in addition to yearly change, effect size = 0.52, p effect size = 0.14, p work-life balance and informal student relationships. There was some, but not complete, recovery in perceptions of the medical school learning environment in the 4th year. Insights: Perceptions of the medical school learning

76 FR 12719 - Safe Schools/Healthy Students Program; Office of Safe and Drug-Free Schools; Safe Schools/Healthy...

Science.gov (United States)

2011-03-08

... DEPARTMENT OF EDUCATION Safe Schools/Healthy Students Program; Office of Safe and Drug- Free Schools; Safe Schools/Healthy Students Program; Catalog of Federal Domestic Assistance (CFDA) Numbers: 84... priorities, requirements, and definitions under the Safe Schools/Healthy Students (SS/HS) program. Since...

High School Students' Perception of University Students as STEM Representatives

DEFF Research Database (Denmark)

Poulsen, Eva Lykkegaard

The Danish government has an ambition to recruit more high school students into STEM edu-cations (science, technology, engineering and/or mathematics). The students’ choice of further education is based on the people and jobs they have knowledge of. Therefore, to recruit more students into STEM....... Some representatives transmit infor-mation and are thereby definers, whereas other representatives illustrates as personal examples and are thereby models. This study focuses on high school students’ views on STEM representatives and the impact these representatives have on the high school students...... studies, it is important to introduce high school students to good STEM representatives to make possible the development of potential STEM identities. A potential identity within a specific subject area relies on at least a situation bound relation-ship to the subject area or the person representing it...

Urban Middle School Students' Perceptions of Bullying, Cyberbullying, and School Safety

Science.gov (United States)

Varjas, Kris; Henrich, Christopher C.; Meyers, Joel

2009-01-01

This study examined 427 urban middle school students' perceptions of bullying, cyberbullying, and school safety utilizing the Student Survey of Bullying Behavior-Revised 2 (Varjas, Meyers, & Hunt, 2006). A unique finding is that cyberbullying may represent a unique modality of victimization and bullying compared with other school-based…

A student manual for promoting mental health among high school students.

Science.gov (United States)

Gigantesco, Antonella; Del Re, Debora; Cascavilla, Isabella

2013-01-01

We describe a school program based on a student manual for promoting mental health and preventing mental illness. A preliminary version of the manual was assessed for face validity by two focus groups. The final version was evaluated for acceptability among 253 students in 10 high schools and 1 middle school in Italy. The manual included 18 chapters (or "units") which address skills for enabling students to cope with their daily lives: communication skills, problem-solving, assertive skills, negotiation, stress management, anger management and conflict resolution. The manual was found to have been acceptable by high school students. The effectiveness of the manual in actually promoting mental health and preventing mental illness is currently being evaluated.

Theory of gearing kinematics, geometry, and synthesis

CERN Document Server

Radzevich, Stephen P

2012-01-01

The first book of its kind, Theory of Gearing: Kinematics, Geometry, and Synthesis systematically develops a scientific theory of gearing that makes it possible to synthesize novel gears with the desired performance. Written by a leading gearing expert who holds more than 200 patents, it presents a modern methodology for gear design. The proposed theory is based on a key postulate: all the design parameters for an optimal gear pair for a particular application can be derived from (a) a given configuration of the rotation vectors of the driving and driven shafts and (b) the power transmitted by

Tooth contact analysis of spur gears. Part 1-SAM analysis of standard gears

Directory of Open Access Journals (Sweden)

Creţu Spiridon

2017-01-01

Full Text Available The involute gears are sensitive to the misalignment of their axes which determines transmission errors and perturbations of pressures distributions along the tooth flank. The concentrated contacts in gears are no longer as Hertz type. A semi-analytical method was developed to find the contact area, pressures distribution and depth stresses state. The matrix of initial separations is found analytically for standard and non-standard spur gears. The presence of misalignment as well as the flank crowning and flank end relief are included in the numerical analysis process.

Achievement and Demographics of Home School Students: 1998

Directory of Open Access Journals (Sweden)

Lawrence M. Rudner

1999-03-01

Full Text Available This report presents the results of the largest survey and testing program for students in home schools to date. In Spring 1998, 20,760 K-12 home school students in 11,930 families were administered either the Iowa Tests of Basic Skills (ITBS or the Tests of Achievement and Proficiency (TAP, depending on their current grade. The parents responded to a questionnaire requesting background and demographic information. Major findings include: the achievement test scores of this group of home school students are exceptionally high--the median scores were typically in the 70th to 80th percentile; 25% of home school students are enrolled one or more grades above their age-level public and private school peers; this group of home school parents has more formal education than parents in the general population; the median income for home school families is significantly higher than that of all families with children in the United States; and almost all home school students are in married couple families. Because this was not a controlled experiment, the study does not demonstrate that home schooling is superior to public or private schools and the results must be interpreted with caution. The report clearly suggests, however, that home school students do quite well in that educational environment.

Student Media in U.S. Secondary Schools: Associations with School Demographic Characteristics

Science.gov (United States)

Bobkowski, Piotr S.; Goodman, Mark; Bowen, Candace Perkins

2012-01-01

This study provides an up-to-date counting of student media in U.S. public high schools. The analysis underscores the importance of school demographic characteristics in predicting whether schools offer student media. The disparities identified here should inform how journalism schools, scholastic journalism organizations, funding agencies, and…

A photovoice study of school belongingness among high school students in Norway.

Science.gov (United States)

Lieblein, Vaiva Sunniva Deraas; Warne, Maria; Huot, Suzanne; Laliberte Rudman, Debbie; Raanaas, Ruth Kjærsti

2018-12-01

Although high school graduation is important for living conditions and health throughout life, many students do not complete. In Norway's northern most county, Finnmark, up to 45% of students do not complete high school. Contrary to prior research that has primarily focused on causes for dropout, this study's aim was to deepen understanding of factors that support high school attendance. A strengths-based participatory approach using photovoice addressed attendance factors as perceived by seven participating students from one high school in Finnmark. Qualitative content analysis of data generated through group dialogue about participant-generated photos and individual interviews identified six factors important for students' school attendance: a supportive school environment, a good learning environment, recuperation and recreation, family and friends, goals and ambitions, and place attachment. Related aspects of a supportive environment and belongingness, where school staff made important contributions to promoting a positive environment, were essential.

Solar Energy Education. Renewable energy activities for junior high/middle school science

Energy Technology Data Exchange (ETDEWEB)

1985-01-01

Some basic topics on the subject of solar energy are outlined in the form of a teaching manual. The manual is geared toward junior high or middle school science students. Topics include solar collectors, solar water heating, solar radiation, insulation, heat storage, and desalination. Instructions for the construction of apparatus to demonstrate the solar energy topics are provided. (BCS)

School climate factors contributing to student and faculty perceptions of safety in select Arizona schools.

Science.gov (United States)

Bosworth, Kris; Ford, Lysbeth; Hernandaz, Diley

2011-04-01

To ensure that schools are safe places where students can learn, researchers and educators must understand student and faculty safety concerns. This study examines student and teacher perceptions of school safety. Twenty-two focus groups with students and faculty were conducted in 11 secondary schools. Schools were selected from a stratified sample to vary in location, proximity to Indian reservations, size, and type. The data analysis was based on grounded theory. In 9 of 11 schools, neither faculty nor students voiced overwhelming concerns about safety. When asked what makes school safe, students tended to report physical security features. School climate and staff actions also increased feelings of safety. Faculty reported that relationships and climate are key factors in making schools safe. High student performance on standardized tests does not buffer students from unsafe behavior, nor does living in a dangerous neighborhood necessarily lead to more drug use or violence within school walls. School climate seemed to explain the difference between schools in which students and faculty reported higher versus lower levels of violence and alcohol and other drug use. The findings raise provocative questions about school safety and provide insight into elements that lead to perceptions of safety. Some schools have transcended issues of location and neighborhood to provide an environment perceived as safe. Further study of those schools could provide insights for policy makers, program planners, and educational leaders. © 2011, American School Health Association.

Urban Students' Perceptions of the School Environment's Influence on School Violence

Science.gov (United States)

Johnson, Sarah Lindstrom; Burke, Jessica Griffin; Gielen, Andrea Carlson

2012-01-01

This article provides information about aspects of the school environment students perceive to influence the occurrence of school violence. Concept mapping, a mixed-methods methodology, was used with two groups of urban, primarily African American high school students (N = 27) to create conceptual frameworks of their understanding of the school…

Charter Schools and Student Compositions of Traditional Public Schools

Directory of Open Access Journals (Sweden)

Nevbahar Ertas

2013-06-01

Full Text Available One of the most contentious urban education policy issues in the United States today is the expansion of charter schools and its repercussions. Does the expansion of charter schools affect the racial and socioeconomic composition of traditional public schools in the United States? This study provides empirical evidence on this question by relying on a panel design that uses school-level data from two states that have experimented with charter schools for more than 15 years: Ohio and Texas. Using county-level, spatial, and enrollment-based measures of charter exposure, the changes from pre- to post-charter-legislation stages in the student compositions of public schools that do and do not face competition from charters are examined. The results suggest that charter school presence contributes to aggregate-level changes in the share of non-Hispanic White and free-lunch-eligible students in traditional public schools in both states in different ways.

Are school-level factors associated with primary school students' experience of physical violence from school staff in Uganda?

Science.gov (United States)

Knight, Louise; Nakuti, Janet; Allen, Elizabeth; Gannett, Katherine R; Naker, Dipak; Devries, Karen M

2016-01-01

The nature and structure of the school environment has the potential to shape children's health and well being. Few studies have explored the importance of school-level factors in explaining a child's likelihood of experiencing violence from school staff, particularly in low-resource settings such as Uganda. To quantify to what extent a student's risk of violence is determined by school-level factors we fitted multilevel logistic regression models to investigate associations and present between-school variance partition coefficients. School structural factors, academic and supportive environment are explored. 53% of students reported physical violence from staff. Only 6% of variation in students' experience of violence was due to differences between schools and half the variation was explained by the school-level factors modelled. Schools with a higher proportion of girls are associated with increased odds of physical violence from staff. Students in schools with a high level of student perceptions of school connectedness have a 36% reduced odds of experiencing physical violence from staff, but no other school-level factor was significantly associated. Our findings suggest that physical violence by school staff is widespread across different types of schools in this setting, but interventions that improve students' school connectedness should be considered. © The Author 2015. Published by Oxford University Press on behalf of Royal Society of Tropical Medicine and Hygiene.

Latino Students' Transition to Middle School: Role of Bilingual Education and School Ethnic Context.

Science.gov (United States)

Hughes, Jan N; Im, MyungHee; Kwok, Oi-Man; Cham, Heining; West, Stephen G

2015-09-01

Participants were 204 academically at-risk Latino students recruited into a study when in first grade and followed for 9 years. Using piecewise latent growth curve analyses, we investigated trajectories of teacher-rated behavioral engagement and student-reported school belonging during elementary school and middle school and the association between trajectories and enrollment in bilingual education classes in elementary school and a change in school ethnic congruence across the transition to middle school. Overall, students experienced a drop in school belonging and behavioral engagement across the transition. A moderating effect of ethnic congruence on bilingual enrollment was found. A decline in ethnic congruence was associated with more positive trajectories for students previously enrolled in bilingual classes but more negative trajectories for non-bilingual students.

Code Compliant School Buildings Boost Student Achievement

Directory of Open Access Journals (Sweden)

Ronald B. Lumpkin

2014-11-01

Full Text Available Much of the focus in the literature in raising student achievement has included parental involvement, principal leadership, quality of instruction, students’ socioeconomic status, curriculum, and use of technology. Limited empirical research relates the condition of the school building as a variable that affects student achievement. Furthermore, there is no research that has examined the impact of building codes on achievement outcomes in the state of Florida. This research determined whether academic achievement of 4th-, 8th-, 9th-, and 10th-grade students as measured by the mathematics and reading subtests of the Florida Comprehensive Achievement Test (FCAT increased in new school buildings compliant to the 2000 Florida State Requirements for Educational Facilities. A causal-comparative design determined whether the independent variables, old and new school building influenced student achievement as measured by students’ FCAT mathematics and reading subtest scores. The control group was two cohorts of 4th-, 8th-, 9th-, and 10th-grade students who attended school in old buildings. The experimental group was two cohorts of 4th-, 8th-, 9th-, and 10th-grade students who attended school in new buildings. Transition from an old school into a new school was the treatment. Two hypotheses were formulated for testing and the research question for the inquiry was whether the percentage of students passing the FCAT mathematics and reading subtests increases after transitioning from an old school building into a new 2000 UBC (Uniform Building Code compliant facility.

Negotiating School Conflicts to Prevent Student Delinquency.

Science.gov (United States)

De Cecco, John P.; Roberts, John K.

One of 52 theoretical papers on school crime and its relation to poverty, this chapter presents a model of negotiation as a means to resolve school conflict. The assumption is that school conflict is inevitable, but student delinquency is not. Delinquent behavior results from the way that the school deals with conflict. Students resort to…

School Start Times for Middle School and High School Students - United States, 2011-12 School Year.

Science.gov (United States)

Wheaton, Anne G; Ferro, Gabrielle A; Croft, Janet B

2015-08-07

Adolescents who do not get enough sleep are more likely to be overweight; not engage in daily physical activity; suffer from depressive symptoms; engage in unhealthy risk behaviors such as drinking, smoking tobacco, and using illicit drugs; and perform poorly in school. However, insufficient sleep is common among high school students, with less than one third of U.S. high school students sleeping at least 8 hours on school nights. In a policy statement published in 2014, the American Academy of Pediatrics (AAP) urged middle and high schools to modify start times as a means to enable students to get adequate sleep and improve their health, safety, academic performance, and quality of life. AAP recommended that "middle and high schools should aim for a starting time of no earlier than 8:30 a.m.". To assess state-specific distributions of public middle and high school start times and establish a pre-recommendation baseline, CDC and the U.S. Department of Education analyzed data from the 2011-12 Schools and Staffing Survey (SASS). Among an estimated 39,700 public middle, high, and combined schools* in the United States, the average start time was 8:03 a.m. Overall, only 17.7% of these public schools started school at 8:30 a.m. or later. The percentage of schools with 8:30 a.m. or later start times varied greatly by state, ranging from 0% in Hawaii, Mississippi, and Wyoming to more than three quarters of schools in Alaska (76.8%) and North Dakota (78.5%). A school system start time policy of 8:30 a.m. or later provides teenage students the opportunity to achieve the 8.5-9.5 hours of sleep recommended by AAP and the 8-10 hours recommended by the National Sleep Foundation.

A student manual for promoting mental health among high school students

Directory of Open Access Journals (Sweden)

Antonella Gigantesco

2013-03-01

Full Text Available OBJECTIVES. We describe a school program based on a student manual for promoting mental health and preventing mental illness. METHODS. A preliminary version of the manual was assessed for face validity by two focus groups. The final version was evaluated for acceptability among 253 students in 10 high schools and 1 middle school in Italy. RESULTS. The manual included 18 chapters (or "units" which address skills for enabling students to cope with their daily lives: communication skills, problem-solving, assertive skills, negotiation, stress management, anger management and conflict resolution. The manual was found to have been acceptable by high school students. CONCLUSIONS. The effectiveness of the manual in actually promoting mental health and preventing mental illness is currently being evaluated.

Students? approaches to medical school choice: relationship with students? characteristics and motivation

OpenAIRE

Wouters, Anouk; Croiset, Gerda; Schripsema, Nienke R.; Cohen-Schotanus, Janke; Spaai, Gerard W.G.; Hulsman, Robert L.; Kusurkar, Rashmi A.

2017-01-01

Objectives The aim was to examine main reasons for students? medical school choice and their relationship with students? characteristics and motivation during the students? medical study. Methods In this multisite cross-sectional study, all Year-1 and Year-4 students who had participated in a selection procedure in one of the three Dutch medical schools included in the study were invited to complete an online survey comprising personal data, their main reason for medical school choice and sta...

49 CFR 230.77 - Foundation brake gear.

Science.gov (United States)

2010-10-01

... 49 Transportation 4 2010-10-01 2010-10-01 false Foundation brake gear. 230.77 Section 230.77... Tenders Brake and Signal Equipment § 230.77 Foundation brake gear. (a) Maintenance. Foundation brake gear...) Distance above the rails. No part of the foundation brake gear of the steam locomotive or tender shall be...

Characteristics of Reduction Gear in Electric Agricultural Vehicle

Science.gov (United States)

Choi, W. S.; Pratama, P. S.; Supeno, D.; Jeong, S. W.; Byun, J. Y.; Woo, J. H.; Lee, E. S.; Park, C. S.

2018-03-01

In electric agricultural machine a reduction gear is needed to convert the high speed rotation motion generated by DC motor to lower speed rotation motion used by the vehicle. The reduction gear consists of several spur gears. Spur gears are the most easily visualized gears that transmit motion between two parallel shafts and easy to produce. The modelling and simulation of spur gears in DC motor reduction gear is important to predict the actual motion behaviour. A pair of spur gear tooth in action is generally subjected to two types of cyclic stress: contact stress and bending stress. The stress may not attain their maximum values at the same point of contact fatigue. These types of failure can be minimized by analysis of the problem during the design stage and creating proper tooth surface profile with proper manufacturing methods. To improve its life expectation in this study modal and stress analysis of reduction gear is simulated using ANSYS workbench based on finite element method (FEM). The modal analysis was done to understand reduction gear deformation behaviour when vibration occurs. FEM static stress analysis is also simulated on reduction gear to simulate the gear teeth bending stress and contact stress behaviour.

Application of Face-Gear Drives in Helicopter Transmissions

Science.gov (United States)

Litvin, F. L.; Wang, J.-C.; Bossler, R. B., Jr.; Chen, Y.-J. D.; Heath, G.; Lewicki, D. G.

1992-01-01

The use of face gears in helicopter transmissions was explored. A light-weight, split torque transmission design utilizing face gears was described. Face-gear design and geometry were investigated. Topics included tooth generation, limiting inner and outer radii, tooth contact analysis, contact ratio, gear eccentricity, and structural stiffness. Design charts were developed to determine minimum and maximum face-gear inner and outer radii. Analytical study of transmission error showed face-gear drives were relatively insensitive to gear misalignment, but tooth contact was affected by misalignment. A method of localizing bearing contact to compensate for misalignment was explored. The proper choice of shaft support stiffness enabled good load sharing in the split torque transmission design. Face-gear experimental studies were also included and the feasibility of face gears in high-speed, high-load applications such as helicopter transmissions was demonstrated.

Executive Functions as Predictors of School Performance and Social Relationships: Primary and Secondary School Students.

Science.gov (United States)

Zorza, Juan Pablo; Marino, Julián; Acosta Mesas, Alberto

2016-05-12

This study examined the relationship between executive functions (EFs) and school performance in primary and secondary school students aged 8 to 13 years (N = 146, M = 10.4, 45.8% girls). EFs were evaluated using the Trail Making Test (TMT), Verbal Fluency (VF), and the Stroop Test. Students' GPAs and teachers' assessment of academic skills were used to measure school performance. To evaluate the students' social behavior, participants were asked to rate all their classmates' prosocial behavior and nominate three students with whom they preferred to do school activities; teachers also provided evaluations of students' social skills. EF measures explained 41% (p = .003, f 2 = .694) of variability in school performance and 29% (p = .005, f 2 = .401) of variance in social behavior in primary school students. The predictive power of EFs was found to be lower for secondary school students, although the TMT showed significant prediction and explained 13% (p = .004, f 2 = .149) of variance in school performance and 15% (p = .008, f 2 = .176) in peer ratings of prosocial behavior. This paper discusses the relevance of EFs in the school environment and their different predictive power in primary and secondary school students.

Public School Uniforms: Effect on Perceptions of Gang Presence, School Climate, and Student Self-Perceptions.

Science.gov (United States)

Wade, Kathleen Kiley; Stafford, Mary E.

2003-01-01

Examined the relationship between public school uniforms and student self-worth and student and staff perceptions of gang presence and school climate. Surveys of middle school students and teachers indicated that although students' perceptions did not vary across uniform policy, teachers from schools with uniform policies perceived lower levels of…

School-based physical therapy services and student functional performance at school.

Science.gov (United States)

Mccoy, Sarah Westcott; Effgen, Susan K; Chiarello, Lisa A; Jeffries, Lynn M; Villasante Tezanos, Alejandro G

2018-03-30

We explored relationships of school-based physical therapy to standardized outcomes of students receiving physical therapy. Using a practice-based evidence research design, School Function Assessment (SFA) outcomes of 296 students with disabilities (mean age 7y 4mo [standard deviation 2y]; 166 males, 130 females), served by 109 physical therapists, were explored. After training, therapists completed 10 SFA scales on students at the beginning and end of the school year. Therapists collected detailed weekly data on services (activities, interventions, types, student participation) using the School-Physical Therapy Interventions for Pediatrics (S-PTIP) system. Stepwise linear regressions were used to investigate S-PTIP predictors of SFA outcomes. Predictors of SFA section outcomes varied in strength, with the coefficient of determination (R 2 ) for each outcome ranging from 0.107 to 0.326. Services that correlated positively with the SFA outcomes included mobility, sensory, motor learning, aerobic/conditioning, functional strengthening, playground access interventions, and higher student participation during therapy (standardized β=0.11-0.26). Services that correlated negatively with the SFA outcomes included providing services within student groups, within school activity, with students not in special education, during recreation activities, and with positioning, hands-on facilitation, sensory integration, orthoses, and equipment interventions (standardized β=-0.14 to -0.22). Consideration of outcomes is prudent to focus services. Overall results suggest we should emphasize active mobility practice by using motor learning interventions and engaging students within therapy sessions. No specific interventions predicted positively on all School Function Assessment (SFA) outcomes. Active movement practice seems related to overall better SFA outcomes. Active mobility practice improved SFA participation, mobility, recreation, and activities of daily living. Engaging

Gear failure of a PHWR refuelling machine

International Nuclear Information System (INIS)

Iorio, A.F.; Crespi, J.C.

1986-01-01

After ten year service in Atucha Nuclear Station a gear belonging to a pressurized heavy water reactor refuelling machine, failed. The gear box was used to transmit motion to the inlet-outlet heavy-water valve of that machine. Visual examination of the gear device revealed an absence of lubricant and several gear teeth were broken off at the root. The gear motion was transmitted from a speed-reducing device with controlled adjustable times in order to produce a right fitness of the valve closure. The main cause of gear failure was due to misalignment produced during assembly or in-service operation. It is suggested to control periodically the level of oil lubricant. (orig./IHOE) [de

14 CFR 25.1515 - Landing gear speeds.

Science.gov (United States)

2010-01-01

... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Landing gear speeds. 25.1515 Section 25... Limitations § 25.1515 Landing gear speeds. (a) The established landing gear operating speed or speeds, V LO, may not exceed the speed at which it is safe both to extend and to retract the landing gear, as...

School Mobility and Students' Academic and Behavioral Outcomes

Science.gov (United States)

Han, Seunghee

2014-01-01

The study examined estimated effects of school mobility on students' academic and behaviouiral outcomes. Based on data for 2,560 public schools from the School Survey on Crime and Safety (SSOCS) 2007-2008, the findings indicate that high schools, urban schools, and schools serving a total student population of more than 50 percent minority…

School Motivation in Secondary Schools: A Survey of LGB and Heterosexual Students in Flanders

Science.gov (United States)

Aerts, Saskia; Van Houtte, Mieke; Dewaele, Alexis; Cox, Nele; Vincke, John

2015-01-01

This study focuses on the school motivation of LGB (lesbian, gay, and bisexual) students in Flanders, the northern part of Belgium, a fairly LGB-friendly country. The authors hypothesize that LGB students in Flemish secondary schools are less motivated for school than heterosexual students because they experience less sense of school belonging and…

The personal and contextual contributors to school belongingness among primary school students.

Directory of Open Access Journals (Sweden)

Sharmila Vaz

Full Text Available School belongingness has gained currency among educators and school health professionals as an important determinant of adolescent health. The current cross-sectional study presents the 15 most significant personal and contextual factors that collectively explain 66.4% (two-thirds of the variability in 12-year old students' perceptions of belongingness in primary school. The study is part of a larger longitudinal study investigating the factors associated with student adjustment in the transition from primary to secondary school. The study found that girls and students with disabilities had higher school belongingness scores than boys, and their typically developing counterparts respectively; and explained 2.5% of the variability in school belongingness. The majority (47.1% out of 66.4% of the variability in school belongingness was explained by student personal factors, such as social acceptance, physical appearance competence, coping skills, and social affiliation motivation; followed by parental expectations (3% out of 66.4%, and school-based factors (13.9% out of 66.4% such as, classroom involvement, task-goal structure, autonomy provision, cultural pluralism, and absence of bullying. Each of the identified contributors of primary school belongingness can be shaped through interventions, system changes, or policy reforms.

Knowledge About HIV/AIDS Among Secondary School Students.

Science.gov (United States)

Gupta, Pratibha; Anjum, Fatima; Bhardwaj, Pankaj; Srivastav, Jp; Zaidi, Zeashan Haider

2013-02-01

HIV/AIDS has emerged as the single most formidable challenge to public health. School children of today are exposed to the risk of HIV/AIDS. The study was conducted to determine the knowledge among secondary school students regarding HIV/AIDS and provide suggestions for HIV/AIDS education in schools. A cross-sectional study was conducted among students of tenth to twelfth standard in the intermediate schools of Lucknow, India, from July to October 2011. A total of 215 students, both boys and girls, were enrolled in the study. In this study, for majority of the students (85%), the source of information about HIV/AIDS was the television. Regarding knowledge about modes of transmission of HIV/AIDS among girl students, 95.1% of them told that it is through unprotected sex. A total of 75.8% students said that it was transmitted from mother to child. It was observed that the knowledge of the school students was quite satisfactory for most of the variables like modes of transmission, including mother-to-child transmission of the disease. However, schools should come forward to design awareness campaigns for the benefit of the students.

School Location, School Section and Students' Gender as Predictors to Secondary School Dropout Rate in Rivers State, Nigeria

Science.gov (United States)

Christian, Mathew

2015-01-01

This study was undertaken to underscore the extent the variables of school location, students' gender and school section can predict the rate of drop out of secondary school students. Ex post facto design was adopted and all data on students' enrollment, retention and completion were collected from available schools' records for two cohorts of…

Student Socioeconomic Status and Gender: Impacts on School Counselors' Ratings of Student Personal Characteristics and School Counselors' Self-Efficacy

Science.gov (United States)

Glance, Dorea E.

2012-01-01

This research focused on how students' socioeconomic status and gender impact school counselors' ratings of student personal characteristics and school counselor self-efficacy. While previous literature focuses on how students' socioeconomic status and gender impact school counselors' ratings of academic characteristics such as…

The Racial School Climate Gap: Within-School Disparities in Students' Experiences of Safety, Support, and Connectedness.

Science.gov (United States)

Voight, Adam; Hanson, Thomas; O'Malley, Meagan; Adekanye, Latifah

2015-12-01

This study used student and teacher survey data from over 400 middle schools in California to examine within-school racial disparities in students' experiences of school climate. It further examined the relationship between a school's racial climate gaps and achievement gaps and other school structures and norms that may help explain why some schools have larger or smaller racial disparities in student reports of climate than others. Multilevel regression results problematized the concept of a "school climate" by showing that, in an average middle school, Black and Hispanic students have less favorable experiences of safety, connectedness, relationships with adults, and opportunities for participation compared to White students. The results also show that certain racial school climate gaps vary in magnitude across middle schools, and in middle schools where these gaps are larger, the racial achievement gap is also larger. Finally, the socioeconomic status of students, student-teacher ratio, and geographic location help explain some cross-school variation in racial climate gaps. These findings have implications for how school climate in conceptualized, measured, and improved.

Uniforms in the Middle School: Student Opinions, Discipline Data, and School Police Data

Science.gov (United States)

Sanchez, Jafeth E.; Yoxsimer, Andrew; Hill, George C.

2012-01-01

This study investigated public middle school students' opinions on the benefits of wearing a school uniform. A review of related literature is provided along with results of the opinions obtained from 604 seventh- and eighth-grade middle school students attending a public school in Nevada that had recently initiated a school uniform policy.…

Comparative Study Of Private And Public Schools Student ...

African Journals Online (AJOL)

Student perceptions of school engagement (i.e., sense of connection to school, teachers and peers), motivation to learn, self-esteem, and student safety are part of a range of public accountability indicators. This study examined differences between two groups of Senior Secondary three (SS III) students from public school ...

Attitudes of Turkish High School Students toward Mathematics

Science.gov (United States)

Yenilmez, Kursat

2007-01-01

This study examines high school students' attitudes toward mathematics and analyzes whether there were differences in attitude and its source that could be attributed to gender, class level, type of school, mathematics success, whether the students received preschool education, families' income level, and high school student's place of living.…

High School Students' Recommendations to Improve School Food Environments: Insights From a Critical Stakeholder Group.

Science.gov (United States)

Asada, Yuka; Hughes, Alejandro G; Read, Margaret; Schwartz, Marlene B; Chriqui, Jamie F

2017-11-01

The Healthy, Hunger-Free Kids Act of 2010 (HHFKA) directed the US Department of Agriculture (USDA) to revise school meal standards. Students are most affected by efforts to improve the school food environment; yet, few studies directly include students. This study examined high school students' experiences of school meal reform to gain insight into implementation recommendations. We conducted 5 focus groups with high school students (N = 15) from high schools across 9 states. We also conducted follow-up interviews to further explore personal experiences. Focus groups and interview transcripts were coded and organized in Atlas.ti v7 by analysts, following principles of constant comparative analysis. Students reported overall positive perceptions of the revised school meal standards and supported continued efforts to improve the food environment. Recommendations to improve the food environment included engaging students, focusing on the quality and palatability of meal items, moving toward scratch-cooking, and addressing cafeteria infrastructure. Students' recommendations point to opportunities where school districts, as well as local, state, and federal organizations can work to improve the school food environment. Their insights are directly relevant to USDA's recently released Local School Wellness Policy final rule, of which school meal standards are one provision. © 2017, American School Health Association.

Start Later, Sleep Later: School Start Times and Adolescent Sleep in Homeschool vs. Public/Private School Students

Science.gov (United States)

Meltzer, Lisa J.; Shaheed, Keisha; Ambler, Devon

2014-01-01

Homeschool students provide a naturalistic comparison group for later/flexible school start times. This study compared sleep patterns and sleep hygiene for homeschool students and public/private school students (grades 6-12). Public/private school students (n=245) and homeschool students (n=162) completed a survey about sleep patterns and sleep hygiene. Significant school group differences were found for weekday bedtime, wake time, and total sleep time, with homeschool students waking later and obtaining more sleep. Homeschool students had later school start times, waking at the same time that public/private school students were starting school. Public/private school students had poorer sleep hygiene practices, reporting more homework and use of technology in the hour before bed. Regardless of school type, technology in the bedroom was associated with shorter sleep duration. Later school start times may be a potential countermeasure for insufficient sleep in adolescents. Future studies should further examine the relationship between school start times and daytime outcomes, including academic performance, mood, and health. PMID:25315902

Bullying victimization and student engagement in elementary, middle, and high schools: Moderating role of school climate.

Science.gov (United States)

Yang, Chunyan; Sharkey, Jill D; Reed, Lauren A; Chen, Chun; Dowdy, Erin

2018-03-01

Bullying is the most common form of school violence and is associated with a range of negative outcomes, including traumatic responses. This study used hierarchical linear modeling to examine the multilevel moderating effects of school climate and school level (i.e., elementary, middle, and high schools) on the association between bullying victimization and student engagement. Participants included 25,896 students in 4th to 12th grades from 114 schools. Results indicated that, after controlling for student and school demographic factors, positive school climate was associated with higher behavioral/cognitive and emotional engagement of students across all grades. This highlights the critical and fundamental role of positive school climate in bullying prevention and intervention, among students across all grade levels, including those with frequent bullying victimization experience. Results also showed that negative associations between student-level bullying victimization and engagement were intensified in more positive school climates. This finding suggests that, in comparison with students in schools with less positive school climates, the engagement of bullying victims in schools with a more positive school climate might be more negatively influenced by their victimization experience. Additionally, the relation between student-level bullying victimization and emotional engagement was significantly different across middle and high schools. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Exploring Strategies to Promote Middle School Student Participation in the School Breakfast Program

Science.gov (United States)

Cullen, Karen Weber; Thompson, Deborah I.; Watson, Kathleen B.

2012-01-01

Purpose/Objective: Providing a school breakfast to students may be a practical intervention that improves energy balance, nutrient intake, and school academic achievement variables. This purpose of this pilot study was to identify the ecological factors influencing middle school student school breakfast participation and possible strategies to…

Student Trust in Teachers and Student Perceptions of Safety: Positive Predictors of Student Identification with School

Science.gov (United States)

Mitchell, Roxanne M.; Kensler, Lisa; Tschannen-Moran, Megan

2018-01-01

This study examined the effects of student trust in teacher and student perceptions of safety on identification with school. Data were collected from one large urban district in an eastern state. Participants included 5441 students in 3rd through 12th grades from 49 schools. Students responded to surveys that assessed student trust in teachers,…

refractive errors among secondary school students in Isuikwuato

African Journals Online (AJOL)

Eyamba

STUDENTS IN ISUIKWUATO LOCAL GOVERNMENT AREA OF ... the prevalence and types of refractive errors among secondary school students ... KEYWORDS: Refractive error, Secondary School students, ametropia, .... interviews of the teachers as regards the general performance of those students with obvious visual.

How High School Students Select a College.

Science.gov (United States)

Gilmour, Joseph E., Jr.; And Others

The college selection process used by high school students was studied and a paradigm that describes the process was developed, based on marketing theory concerning consumer behavior. Primarily college freshmen and high school seniors were interviewed, and a few high school juniors and upper-level college students were surveyed to determine…

Scientific Literacy of High School Students.

Science.gov (United States)

Lucas, Keith B.; Tulip, David F.

This investigation was undertaken in order to establish the status of scientific literacy among three groups of secondary school students in four Brisbane, Australia high schools, and to reduce the apparent reticence of science teachers to evaluate students' achievement in the various dimensions of scientific literacy by demonstrating appropriate…

Matching Students to Schools

Directory of Open Access Journals (Sweden)

Dejan Trifunovic

2017-08-01

Full Text Available In this paper, we present the problem of matching students to schools by using different matching mechanisms. This market is specific since public schools are free and the price mechanism cannot be used to determine the optimal allocation of children in schools. Therefore, it is necessary to use different matching algorithms that mimic the market mechanism and enable us to determine the core of the cooperative game. In this paper, we will determine that it is possible to apply cooperative game theory in matching problems. This review paper is based on illustrative examples aiming to compare matching algorithms in terms of the incentive compatibility, stability and efficiency of the matching. In this paper we will present some specific problems that may occur in matching, such as improving the quality of schools, favoring minority students, the limited length of the list of preferences and generating strict priorities from weak priorities.

Relationships Among Student, Staff, and Administrative Measures of School Climate and Student Health and Academic Outcomes.

Science.gov (United States)

Gase, Lauren N; Gomez, Louis M; Kuo, Tony; Glenn, Beth A; Inkelas, Moira; Ponce, Ninez A

2017-05-01

School climate is an integral part of a comprehensive approach to improving the well-being of students; however, little is known about the relationships between its different domains and measures. We examined the relationships between student, staff, and administrative measures of school climate to understand the extent to which they were related to each other and student outcomes. The sample included 33,572 secondary school students from 121 schools in Los Angeles County during the 2014-2015 academic year. A multilevel regression model was constructed to examine the association between the domains and measures of school climate and 5 outcomes of student well-being: depressive symptoms or suicidal ideation, tobacco use, alcohol use, marijuana use, and grades. Student, staff, and administrative measures of school climate were weakly correlated. Strong associations were found between student outcomes and student reports of engagement and safety, while school staff reports and administrative measures of school climate showed limited associations with student outcomes. As schools seek to measure and implement interventions aimed at improving school climate, consideration should be given to grounding these efforts in a multidimensional conceptualization of climate that values student perspectives and includes elements of both engagement and safety. © 2017, American School Health Association.

Elementary Student Perceptions of School Climate and Associations with Individual and School Factors

Science.gov (United States)

La Salle, Tamika P.; Zabek, Faith; Meyers, Joel

2016-01-01

School climate has increasingly been recognized as an essential component of school improvement owing to the established associations between a positive school climate and academic outcomes for students. Our study examines associations among a brief measure of school climate assessing elementary student perceptions and the College and Career Ready…

Attitudes of High School Students towards Geometry

Directory of Open Access Journals (Sweden)

Esat Avcı

2014-12-01

Full Text Available In this research, attitudes of high school students towards geometry were investigated in terms of gender, grade, types of the field and school. Population of research includes students who were studying at high school in five distincs of Mersin in 2013-2014 academical year. Sample of research includes 935 students from twelve high schools. Attitude scale which was developed by Su-Özenir (2008 was used for data collection. For data analysis, mean, standart deviation, t test and ANOVA were used. A meaningful difference between students’ attitudes towards geometry and variance of gender and grade level wasn’t observed, on the other hand a meaningful difference according to field and school type is observed.Key Words:    Attitudes towards geometry, high school geometry lesson, attitude scale

Greenhouse Schools: How Schools Can Build Cultures Where Teachers and Students Thrive. Executive Summary

Science.gov (United States)

TNTP, 2012

2012-01-01

Successful teachers make successful schools. Yet some schools are better than others at accelerating student learning by developing and keeping great teachers, even compared to schools that serve the same population of students and have access to the same resources. These schools are called "greenhouse schools"--schools with carefully fostered…

A superconducting magnetic gear

International Nuclear Information System (INIS)

Campbell, A M

2016-01-01

A comparison is made between a magnetic gear using permanent magnets and superconductors. The objective is to see if there are any fundamental reasons why superconducting magnets should not provide higher power densities than permanent magnets. The gear is based on the variable permeability design of Attilah and Howe (2001 IEEE Trans. Magn. 37 2844–46) in which a ring of permanent magnets surrounding a ring of permeable pole pieces with a different spacing gives an internal field component at the beat frequency. Superconductors can provide much larger fields and forces but will saturate the pole pieces. However the gear mechanism still operates, but in a different way. The magnetisation of the pole pieces is now constant but rotates with angle at the beat frequency. The result is a cylindrical Halbach array which produces an internal field with the same symmetry as in the linear regime, but has an analytic solution. In this paper a typical gear system is analysed with finite elements using FlexPDE. It is shown that the gear can work well into the saturation regime and that the Halbach array gives a good approximation to the results. Replacing the permanent magnets with superconducting tapes can give large increases in torque density, and for something like a wind turbine a combined gear and generator is possible. However there are major practical problems. Perhaps the most fundamental is the large high frequency field which is inevitably present and which will cause AC losses. Also large magnetic fields are required, with all the practical problems of high field superconducting magnets in rotating machines. Nevertheless there are ways of mitigating these difficulties and it seems worthwhile to explore the possibilities of this technology further. (paper)

Career orientation of senior secondary school students

Directory of Open Access Journals (Sweden)

Suryadi Bambang

2018-01-01

Full Text Available The main purpose of this study is to portray career orientation of Senior High School (SMA and Vocational High School (SMK students and the role that school counselors should play in providing vocational guidance. This study used a survey method involving 278 students from both SMA and SMK di Jakarta. Career Orientation Inventory (COI and Counselor Role in Career Guidance Inventory were used as an instrument of data collection. Descriptive statistics and t-test were conducted to analyze the data. The findings of the study reveal that majority of SMA and SMK students wanted to further their study to university and only small number of them wanted to find out jobs or run their own business. The findings also show that school counselors play a very important role in providing vocational guidance services for senior secondary students. Therefore, in order for students to have a bright career in future, school counselors should improve the quality of vocational guidance services and plan comprehensive vocational guidance programs.

Lubrication and cooling for high speed gears

Science.gov (United States)

Townsend, D. P.

1985-01-01

The problems and failures occurring with the operation of high speed gears are discussed. The gearing losses associated with high speed gearing such as tooth mesh friction, bearing friction, churning, and windage are discussed with various ways shown to help reduce these losses and thereby improve efficiency. Several different methods of oil jet lubrication for high speed gearing are given such as into mesh, out of mesh, and radial jet lubrication. The experiments and analytical results for the various methods of oil jet lubrication are shown with the strengths and weaknesses of each method discussed. The analytical and experimental results of gear lubrication and cooling at various test conditions are presented. These results show the very definite need of improved methods of gear cooling at high speed and high load conditions.

Reliability and validity of the Student Perceptions of School Cohesion Scale in a sample of Salvadoran secondary school students

Directory of Open Access Journals (Sweden)

Arrivillaga Marcela

2009-11-01

Full Text Available Abstract Background Despite a growing body of research from the United States and other industrialized countries on the inverse association between supportive social relationships in the school and youth risk behavior engagement, research on the measurement of supportive school social relationships in Central America is limited. We examined the psychometric properties of the Student Perceptions of School Cohesion (SPSC scale, a 10-item scale that asks students to rate with a 5-point Likert-type response scale their perceptions of the school social environment, in a sample of public secondary school students (mean age = 15 years living in central El Salvador. Methods Students (n = 982 completed a self-administered questionnaire that included the SPSC scale along with measures of youth health risk behaviors based on the Center for Disease Control and Prevention's Youth Risk Behavior Survey. Exploratory factor analysis was used to assess the factor structure of the scale, and two internal consistency estimates of reliability were computed. Construct validity was assessed by examining whether students who reported low school cohesion were significantly more likely to report physical fighting and illicit drug use. Results Results indicated that the SPSC scale has three latent factors, which explained 61.6% of the variance: supportive school relationships, student-school connectedness, and student-teacher connectedness. The full scale and three subscales had good internal consistency (rs = .87 and α = .84 for the full scale; rs and α between .71 and .75 for the three subscales. Significant associations were found between the full scale and all three subscales with physical fighting (p ≤ .001 and illicit drug use (p Conclusion Findings provide evidence of reliability and validity of the SPSC for the measurement of supportive school relationships in Latino adolescents living in El Salvador. These findings provide a foundation for further research on

School ethnic diversity and students' interethnic relations.

Science.gov (United States)

Thijs, Jochem; Verkuyten, Maykel

2014-03-01

School ethnic desegregation has been a topic of strong societal and educational concern. Research has examined the effects of ethnic school composition on students' interethnic relations with diverging outcomes and sometimes inconsistent results. In this review paper, we provide an assessment of this literature to explain why and when school desegregation might improve or worsen ethnic relations and to identify important future research directions. We discuss different theoretical perspectives predicting positive versus negative aspects of school ethnic diversity: intergroup contact theory and the perspectives of group threat and power differences. Subsequently, we consider a number of school and educational characteristics that can moderate the impact of ethnic diversity on students' interethnic relations and that could be considered in future research. Furthermore, we discuss the need for studying underlying psychological and social processes as well as the importance of investigating interethnic relations in combination with academic adjustment. School ethnic diversity is not enough to promote interethnic tolerance. It is important to examine diversity in relation to other aspects of the school environment that may influence how students respond to the ethnic diversity within school. Important factors to consider are the presence of multicultural education and inclusive school identities, student-teacher relationships, and peer norms and networks, but also the role of parents and of peer relations outside the school context. © 2013 The British Psychological Society.

Dynamics of High-Speed Precision Geared Rotor Systems

Directory of Open Access Journals (Sweden)

Lim Teik C.

2014-07-01

Full Text Available Gears are one of the most widely applied precision machine elements in power transmission systems employed in automotive, aerospace, marine, rail and industrial applications because of their reliability, precision, efficiency and versatility. Fundamentally, gears provide a very practical mechanism to transmit motion and mechanical power between two rotating shafts. However, their performance and accuracy are often hampered by tooth failure, vibrations and whine noise. This is most acute in high-speed, high power density geared rotor systems, which is the primary scope of this paper. The present study focuses on the development of a gear pair mathematical model for use to analyze the dynamics of power transmission systems. The theory includes the gear mesh representation derived from results of the quasi-static tooth contact analysis. This proposed gear mesh theory comprising of transmission error, mesh point, mesh stiffness and line-of-action nonlinear, time-varying parameters can be easily incorporated into a variety of transmission system models ranging from the lumped parameter type to detailed finite element representation. The gear dynamic analysis performed led to the discovery of the out-of-phase gear pair torsion modes that are responsible for much of the mechanical problems seen in gearing applications. The paper concludes with a discussion on effectual design approaches to minimize the influence of gear dynamics and to mitigate gear failure in practical power transmission systems.

Dual Enrollment for High School Students

Science.gov (United States)

Edwards, Linsey; Hughes, Katherine

2011-01-01

Dual enrollment programs allow high school students to enroll in college courses and potentially earn college credit. The term concurrent enrollment is sometimes used interchangeably with dual enrollment, and sometimes to refer to a particular model of dual enrollment. In some programs, students earn high school and college credit simultaneously;…

Computer simulation of gear tooth manufacturing processes

Science.gov (United States)

Mavriplis, Dimitri; Huston, Ronald L.

1990-01-01

The use of computer graphics to simulate gear tooth manufacturing procedures is discussed. An analytical basis for the simulation is established for spur gears. The simulation itself, however, is developed not only for spur gears, but for straight bevel gears as well. The applications of the developed procedure extend from the development of finite element models of heretofore intractable geometrical forms, to exploring the fabrication of nonstandard tooth forms.

Law School Intentions of Undergraduate Business Students

Science.gov (United States)

Edmonds, Thomas; Flanagan, David J.; Palmer, Timothy B.

2013-01-01

The purpose of this paper is to examine factors that influence business students' intentions to enroll in law school. Scant research has focused on factors that influence business students' decisions to enroll in law school. This paper attempts to fill that gap. Hypotheses about student intentions are based on Ajzen & Fishbein's (1977) Theory…

Stress and Perception of School Satisfaction on a Sample of Slovene Primary School Students

OpenAIRE

Ines Lovenjak; Cirila Peklaj

2016-01-01

The aim of our research was to determine the relationships between experiencing stress, coping strategies, coping self-efficacy and primary school students' school satisfaction. We were also interested in the predictive power of these variables on school satisfaction. A total of 512 students from the seventh, eighth and ninth grades participated in this study and the results show that primary school students which are feeling stressed are less satisfied with school. There is a negative correl...

Communication: Molecular gears

Energy Technology Data Exchange (ETDEWEB)

Burnell, E. Elliott, E-mail: elliott.burnell@ubc.ca [Chemistry Department, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1 (Canada); Lange, Cornelis A. de, E-mail: c.a.de.lange@vu.nl [Atomic, Molecular and Laser Physics, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam (Netherlands); Meerts, W. Leo, E-mail: leo.meerts@science.ru.nl [Atomic, Molecular and Laser Physics, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam (Netherlands); Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, NL-6525 AJ Nijmegen (Netherlands)

2016-09-07

The {sup 1}H nuclear magnetic resonance spectrum of hexamethylbenzene orientationally ordered in the nematic liquid crystal ZLI-1132 is analysed using covariance matrix adaptation evolution strategy. The spectrum contains over 350 000 lines with many overlapping transitions, from which four independent direct dipolar couplings are obtained. The rotations of the six methyl groups appear to be correlated due to mutual steric hindrance. Adjacent methyl groups show counter-rotating or geared motion. Hexamethylbenzene thus behaves as a molecular hexagonal gear.

Relationships between Student, Staff, and Administrative Measures of School Climate and Student Health and Academic Outcomes

Science.gov (United States)

Gase, Lauren Nichol; Gomez, Louis M.; Kuo, Tony; Glenn, Beth A.; Inkelas, Moira; Ponce, Ninez A.

2018-01-01

BACKGROUND School climate is an integral part of a comprehensive approach to improving the wellbeing of students; however, little is known about the relationships between its different domains and measures. This study examined the relationships between student, staff, and administrative measures of school climate in order to understand the extent to which they were related to each other and student outcomes. METHODS The sample included 33,572 secondary school students from 121 schools in Los Angeles County during the 2014–2015 academic year. A multilevel regression model was constructed to examine the association between the domains and measures of school climate and five outcomes of student wellbeing: depressive symptoms or suicidal ideation, tobacco use, alcohol use, marijuana use, and grades. RESULTS Student, staff, and administrative measures of school climate were weakly correlated. Strong associations were found between student outcomes and student reports of engagement and safety, while school staff reports and administrative measures of school climate showed limited associations with student outcomes. CONCLUSIONS As schools seek to measure and implement interventions aimed at improving school climate, consideration should be given to grounding these efforts in a multi-dimensional conceptualization of climate that values student perspectives and includes elements of both engagement and safety. PMID:28382671

Survey on a sleep habits for university and high school students.

OpenAIRE

林, 光緒; 堀, 忠雄

1988-01-01

A survey was performed on 466 high school students and 403 university students. 86% of high school students and 89% of university students estimated their customary sleep time to be 6-8 hours. Although there was no significant difference between high school students and university students with awake time, bed time was later for university students than high school students. So that sleep time was shorter for university students. Also there was more regular sleepers for high school students a...

Short Sleep Duration Among Middle School and High School Students - United States, 2015.

Science.gov (United States)

Wheaton, Anne G; Jones, Sherry Everett; Cooper, Adina C; Croft, Janet B

2018-01-26

Insufficient sleep among children and adolescents is associated with increased risk for obesity, diabetes, injuries, poor mental health, attention and behavior problems, and poor academic performance (1-4). The American Academy of Sleep Medicine has recommended that, for optimal health, children aged 6-12 years should regularly sleep 9-12 hours per 24 hours and teens aged 13-18 years should sleep 8-10 hours per 24 hours (1). CDC analyzed data from the 2015 national, state, and large urban school district Youth Risk Behavior Surveys (YRBSs) to determine the prevalence of short sleep duration (school nights among middle school and high school students in the United States. In nine states that conducted the middle school YRBS and included a question about sleep duration in their questionnaire, the prevalence of short sleep duration among middle school students was 57.8%, with state-level estimates ranging from 50.2% (New Mexico) to 64.7% (Kentucky). The prevalence of short sleep duration among high school students in the national YRBS was 72.7%. State-level estimates of short sleep duration for the 30 states that conducted the high school YRBS and included a question about sleep duration in their questionnaire ranged from 61.8% (South Dakota) to 82.5% (West Virginia). The large percentage of middle school and high school students who do not get enough sleep on school nights suggests a need for promoting sleep health in schools and at home and delaying school start times to permit students adequate time for sleep.

School Lunch Waste among Middle School Students: Implications for Nutrients Consumed and Food Waste Costs

Science.gov (United States)

Cohen, Juliana F.W.; Richardson, Scott; Austin, S. Bryn; Economos, Christina D.; Rimm, Eric B.

2013-01-01

Background The National School Lunch Program has been guided by modest nutrient standards, and the palatability of meals, which drives consumption, receives inadequate attention. School food waste can have important nutritional and cost implications for policy makers, students, and their families. Purpose Nutrient losses and economic costs associated with school meal waste were examined. The study also assessed if school foods served were valid proxies for foods consumed by students. Methods Plate waste measurements were collected from middle school students in Boston attending two Chef Initiative schools (n=1609) and two control schools (n=1440) during a two-year pilot study (2007-2009) where a professional chef trained cafeteria staff to make healthier school meals. The costs associated with food waste were calculated and the percent of foods consumed was compared with a gold standard of 85% consumption. Analyses were conducted in 2010-2011. Results Overall, students consumed less than the required/recommended levels of nutrients. An estimated $432,349 of food (26.1% of the total food budget) was discarded by middle school students annually at lunch in Boston middle schools. For most meal components, significantly less than 85% was consumed. Conclusions There is substantial food waste among middle school students in Boston. Overall, students' nutrient consumption levels were below school meal standards and foods served were not valid proxies for foods consumed. The costs associated with discarded foods are high; if translated nationally for school lunches, roughly $1,238,846,400 annually is wasted. Students would benefit if additional focus was given to the quality and palatability of school meals. PMID:23332326

A Study of Democratic School Culture Perceptions of Sport High School Students

Science.gov (United States)

Isikgöz, Enes

2016-01-01

In this study; the perceptions of the students studying at sport high schools about democratic school culture were analysed in accordance with different variables. Participants of the research consisted of 216 students studying at Sport High Schools in Sakarya and Batman Provinces of Turkey. The data were collected with the Democratic School…

School Climate for Academic Success: A Multilevel Analysis of School Climate and Student Outcomes

Science.gov (United States)

Kwong, Darren; Davis, Jonathan Ryan

2015-01-01

This multilevel study examined the relationship between school climate and academic achievement. Using the Educational Longitudinal Survey (ELS, 2002), and a sample of 16,258 students and 1954 schools nationwide, we found that student-level perception of school climate--especially the student learning environment--was highly predictive of academic…

[The influencing factors on alienation in high school students].

Science.gov (United States)

Lee, Eun-Sook

2004-02-01

This study was performed to identify the influencing factors on alienation among high school students. Data was collected by questionnaires from 550 students of academic and vocational high schools in G city. The data was analyzed using descriptive statistics, pearson correlation coefficients, and stepwise multiple regression. The scores of alienation among students in financially lower middle class and lower class were higher than those of the upper middle class students, resulting in significant differences(F=6.87, p=.00). A sense of alienation showed a significantly negative correlation with the scores of responding parenting style(r=-.32), family cohesion(r=-.33), school attachment(r=-.51), academic performance(r=-.34), peer relationships(r=-.38), self-control (r=-.43), and social skills(r=-.33). The most powerful predictor of alienation among high school students was school attachment and the variance explained was 26%. A combination of school attachment, self control, peer relationships, family cohesion, demanding parenting style, and academic performance account for 40% of the variance in alienation among high school students. This study suggests that school attachment, self control, peer relationships, family cohesion, demanding parenting style, and academic performance are significant influencing factors on alienation in high school students. Therefore, nursing strategy is needed to manage these revealed factors.

[Relationship between nutritional status and school absenteeism among students in rural schools].

Science.gov (United States)

Rodríguez-Escobar, Gilma; Vargas-Cruz, Sandra L; Ibáñez-Pinilla, Edgar; Matiz-Salazar, María I; Jörgen-Overgaard, Hans

2015-12-01

Objective To determine the nutritional status and prevalence of malnutrition and overweight in students in rural schools and their relationship with school absence rates. Methods Descriptive study carried out in 34 rural schools in Anapoima and La Mesa in 2013. A sample of 785 (82.4 %) students was selected by convenience sampling. The inclusion criteria were students registered for the period 2013 in grades 0-5 (ages 5-16) with parental consent and student assent. Weight and height of all subjects were taken. Overall absence rates and illness-related absence rates were recorded. Results 422 pupils were male (53.8 %) and 524 (66.8 %) had between 5-9 years old. A lower than average height for age occurred in 10.1 %(n=79) of the students. The thinness was recorded at 1.75 %(n=13), the overweight at 14.3 %(n=112) and the obesity at 4.5 %(n=45) of the students. The number of absence episodes per child per year due to any reason and due to disease was 5.7 and 1.4, respectively. Stunted growth and overweight students had a significantly higher number of absence days compared to students with adequate nutritional status (p school absence days (both general and illness-related) and stunting and overweight in students.

THE CAUSES OF ABSENTEEISM OF HIGH SCHOOL STUDENTS

OpenAIRE

Gürbüz Ocak; İjlal Ocak; Emine A. Baysal

2017-01-01

The purpose of this study is to find out the causes of high school students’ absenteeism. Survey method was used. The population was comprised of 531 students in the public high schools. The data was collected with "The Scale of Absenteeism Causes" developed by the researchers. Cronbach Alpha was calculated as α=0.936. Findings show the causes of students' absenteeism aren't related to school, students themselves and their parent, however, student absenteeism causes partly psychological reaso...

Eating School Lunch Is Associated with Higher Diet Quality among Elementary School Students.

Science.gov (United States)

Au, Lauren E; Rosen, Nila J; Fenton, Keenan; Hecht, Kenneth; Ritchie, Lorrene D

2016-11-01

Few studies have assessed the dietary quality of children who eat meals from home compared with school meals according to the 2010 Dietary Guidelines for Americans. The objective of this study was to examine diet quality for elementary school students in relation to source of breakfast and lunch (whether school meal or from an outside source). An observational study was conducted of students in 43 schools in San Diego, CA, during the 2011-2012 school year. Fourth- and fifth-grade students (N=3,944) completed a diary-assisted 24-hour food recall. The Healthy Eating Index-2010 (HEI-2010) scores of children who ate breakfast and lunch at school were compared with the HEI-2010 scores of children who obtained their meals from home and a combination of both school and home. Analysis of variance, χ 2 test, and generalized estimating equation models adjusted for age, sex, race/ethnicity, grade, language, and school level clustering were performed. School lunch eaters had a higher mean±standard deviation overall diet quality score (HEI-2010=49.0±11.3) compared with students who ate a lunch obtained from home (46.1±12.2; P=0.02). There was no difference in overall diet quality score by breakfast groups. Students who ate school breakfast had higher total fruit (P=0.01) and whole fruit (P=0.0008) scores compared with students who only ate breakfast obtained from home. Students who ate school foods had higher scores for dairy (P=0.007 for breakfast and Pempty calories from solid fats and added sugars (P=0.01 for breakfast and P=0.007 for lunch). Eating school lunch was associated with higher overall diet quality compared with obtaining lunch from home. Future studies are needed that assess the influence of the Healthy Hunger-Free Kids Act on children's diet quality. Copyright © 2016 Academy of Nutrition and Dietetics. Published by Elsevier Inc. All rights reserved.

Remote Research Mentoring of Virginia High School Students

Science.gov (United States)

Corby, Joanna; Dirienzo, W. J.; Beaton, R.; Pennucci, T.; Zasowski, G.

2013-01-01

Graduate students at the University of Virginia (UVa) are volunteering as research advisors on astronomy projects for Virginia's science and technology high schools. In previous years, we have worked with more than a dozen students through a research class at Central Virginia Governor's School in Lynchburg to develop an astronomy research curriculum that teaches background concepts and terminology, guides students in data analysis, and prepares them to present material in poster and oral forums. In our fourth year of operation, we are continuing to work with Central Virginia Governor's School and adapting the research curriculum to an independent course at Roanoke Valley Governor's School in Roanoke. Because both schools are far from UVa in Charlottesville, the program operates remotely; graduate advisors and high school students interact through "virtual" means, establishing a successful framework for meaningful remote mentoring. In the current year, six students will complete projects on astrophysical topics including megamasers, astrochemistry, and pulsars using data taken by the Green Bank Telescope (GBT). Students at Roanoke Valley were directly trained on the GBT as part of a separate outreach program called the Pulsar Search Collaboratory, and all six students will receive hands-on experience in handling GBT data. The current projects are components of larger research efforts by graduate student and professional level researchers, so that the projects contribute to high-level projects only possible with the GBT. This stands as a rare outreach program that uses the principle of “deliberative practice” to train high school students in the development of skills that are crucial to success in science. Furthermore, it provides graduate students with an opportunity to plan and advise research projects, developing a skill set that is required in more advanced academic positions. Our poster discusses the implementation of our online curriculum in two distinct

Development in Geared Turbofan Aeroengine

Science.gov (United States)

Mohd Tobi, A. L.; Ismail, A. E.

2016-05-01

This paper looks into the implementation of epicyclic gear system to the aeroengine in order to increase the efficiency of the engine. The improvement made is in the direction of improving fuel consumption, reduction in pollutant gasses and perceived noise. Introduction of epicyclic gear system is capable to achieve bypass ratio of up to 15:1 with the benefits of weight and noise reduction. Radical new aircraft designs and engine installation are being studied to overcome some of the challenges associated with the future geared turbofan and open-rotor engine.

School as a risk factor for psychoactive substance use by middle school students

Science.gov (United States)

Okulicz-Kozaryn, Katarzyna

2010-01-01

For the majority of Polish students school is a source of negative experiences and therefore may increase the risk of adolescent problem behaviors. The results of the study conducted in Warsaw middle schools (N=2244, 54% girls) indicated that changes for worse (between 7 and 8 grade) in students' behavior increase the risk of drug use. However, changes for better in students' perception of school value and school achievements are risk factors, too (even when family and peer risk factors are controlled). PMID:21152104

Do schools influence student risk-taking behaviors and emotional health symptoms?

Science.gov (United States)

Denny, Simon J; Robinson, Elizabeth M; Utter, Jennifer; Fleming, Theresa M; Grant, Sue; Milfont, Taciano L; Crengle, Sue; Ameratunga, Shanthi N; Clark, Terryann

2011-03-01

Many schools engage in health promotion, health interventions, and services aimed at improving the health and well-being outcomes for students. The purpose of this study was to examine the effects of schools on student health risk-taking behaviors and depressive symptoms. A nationally representative sample (n = 9,056) of students from 96 secondary schools completed a health and well-being survey using Internet Tablets that included questions on school climate, health risk-taking behaviors, and mental health. Teachers (n = 2,901) and school administrators (n = 91) completed questionnaires on aspects of the school climate which included teacher well-being and burnout, the staff work environment, health and welfare services for students, and school organizational support for student health and well-being. Multilevel models were used to estimate school effects on the health risk-taking behaviors and depression symptoms among students. Schools where students reported a more positive school climate had fewer students with alcohol use problems, and fewer students engaging in violence and risky motor vehicle behaviors. Schools where teachers reported better health and welfare services for students had fewer students engaging in unsafe sexual health behaviors. Schools where teachers reported higher levels of well-being had fewer students reporting significant levels of depressive symptoms. More positive school climates and better school health and welfare services are associated with fewer health risk-taking behaviors among students. However, the overall school effects were modest, especially for cigarette use and suicidal behaviors. Copyright © 2011 Society for Adolescent Health and Medicine. Published by Elsevier Inc. All rights reserved.

Fishing gear-related injury in California marine wildlife.

Science.gov (United States)

Dau, Brynie Kaplan; Gilardi, Kirsten V K; Gulland, Frances M; Higgins, Ali; Holcomb, Jay B; Leger, Judy St; Ziccardi, Michael H

2009-04-01

We reviewed medical records from select wildlife rehabilitation facilities in California to determine the prevalence of injury in California Brown Pelicans (Pelecanus occidentalis), gulls (Larus spp.), and pinniped species (Zalophus californianus, Mirounga angustirostris, and Phoca vitulina) due to fishing gear entanglement and ingestion from 2001 to 2006. Of 9,668 Brown Pelican, gull, and pinniped cases described during the 6-yr study period (2001-06), 1,090 (11.3%) were fishing gear-related. Pelican injuries caused by fishing gear were most common in the Monterey Bay region, where 59.6% of the pelicans rescued in this area and admitted to a rehabilitation center were injured by fishing gear over the 6-yr period. The highest prevalence of fishing gear-related injury in gulls was documented in the Los Angeles/Orange County region (16.1%), whereas the highest prevalences in pinnipeds were seen in the San Diego region (3.7%). Despite these higher prevalences of gull and pinniped fishing gear-related injuries in these specific regions, there was no statistical significance in these trends. Juvenile gulls and pinnipeds were more commonly injured by fishing gear than adults (gulls: P = 0.03, odds ratio = 1.29; pinnipeds: P = 0.01, odds ratio = 2.07). Male pinnipeds were twice as likely to be injured by fishing gear as females (P gear-related injury cases that were successfully rehabilitated and released (percentage of cases successfully rehabilitated to the point of release out of the total number of fishing gear-related injury cases) was high in all three species groups (pelicans: 63%; gulls: 54%; pinnipeds: 70%). Fishing gear-related injuries in Brown Pelicans and gulls were highest in the fall, but there was only a significant difference between seasons for fishing gear-related injuries in pelicans. Fishing gear-related injuries in pinnipeds most commonly occurred in summer; however, a statistical difference was not detected between seasons for pinnipeds. Derelict

Secondary School Students' Predictors of Science Attitudes

Science.gov (United States)

Tosun, Cemal; Genç, Murat

2016-01-01

The purpose of this study is to identify the factors that affect the secondary school students' attitudes in science. This study was conducted using survey method. The sample of the study was 503 students from four different secondary schools in Bartin and Düzce. Data were obtained using the Survey of Factors Affecting Students' Science Attitudes…

A comparison of rural high school students in Germany with rural Tennessee high school students' mathematics and science achievement

Science.gov (United States)

Harding, R. Fredrick

This descriptive study compared the science and mathematics aptitudes and achievement test scores for the final school year students in rural White County and Van Buren County, Tennessee with rural county students in Germany. In accordance with the previous research literature (Stevenson, 2002), German students outperformed U.S. students on The International Trends in Math and Science test (TIMSS). As reform in the U.S. education system has been underway, this study intended to compare German county student final school year performance with White County and Van Buren County (Grade 12) performance in science and mathematics. The entire populations of 176 White and Van Buren Counties senior high final school year students were compared with 120 school final year students from two rural German county high schools. The student responses to identical test and questionnaire items were compared using the t-test statistical analysis. In conclusion after t-test analyses, there was no significant difference (p>.05 level) in student attitudes on the 27 problem achievement and the 35 TIMSS questionnaire items between the sampled population of 120 German students compared with the population of 176 White and Van Buren students. Also, there was no statistically significant difference (p>.05 level) between the German, White, and Van Buren County rural science and math achievement in the TIMSS problem section of the final year test. Based on the research, recommendations to improve U.S. student scores to number one in the world include making changes in teaching methodology in mathematics and science; incorporating pamphlet lessons rather than heavily reliance on textbooks; focusing on problem solving; establishing an online clearinghouse for effective lessons; creating national standards in mathematics and science; matching students' course choices to job aspirations; tracking misbehaving students rather than mainstreaming them into the regular classroom; and designing

Supporting Students with Disabilities during School Crises: A Teacher's Guide

Science.gov (United States)

Clarke, Laura S.; Embury, Dusty Columbia; Jones, Ruth E.; Yssel, Nina

2014-01-01

Most schools have crisis plans to support student safety, but few plans address the complex needs of students with disabilities. School supports should include analysis of school plans and student strengths and needs to ensure that students with disabilities have the best opportunity to be safe in school crises. Recommendations include developing…

An Investigation of Students' Perceptions about Democratic School Climate and Sense of Community in School

Science.gov (United States)

Karakus, Memet

2017-01-01

This study aims to investigate students' perceptions about democratic school climate and sense of community in school. In line with this purpose, it aims to find answers to the following questions: How democratic do students find the school climate? What is students' sense of belonging level at school? What is the academic success level of…

50 CFR 654.25 - Prevention of gear conflicts.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Prevention of gear conflicts. 654.25... Measures § 654.25 Prevention of gear conflicts. (a) No person may knowingly place in the management area any article, including fishing gear, that interferes with fishing or obstructs or damages fishing gear...

29 CFR 1919.31 - Proof tests-loose gear.

Science.gov (United States)

2010-07-01

... 29 Labor 7 2010-07-01 2010-07-01 false Proof tests-loose gear. 1919.31 Section 1919.31 Labor... (CONTINUED) GEAR CERTIFICATION Certification of Vessels: Tests and Proof Loads; Heat Treatment; Competent Persons § 1919.31 Proof tests—loose gear. (a) Chains, rings, shackles and other loose gear (whether...

Face Gear Technology for Aerospace Power Transmission Progresses

Science.gov (United States)

2005-01-01

The use of face gears in an advanced rotorcraft transmission design was first proposed by the McDonnell Douglas Helicopter Company during their contracted effort with the U.S. Army under the Advanced Rotorcraft Transmission (ART) program. Face gears would be used to turn the corner between the horizontal gas turbine engine and the vertical output rotor shaft--a function currently done by spiral bevel gears. This novel gearing arrangement would substantially lower the drive system weight partly because a face gear mesh would be used to split the input power between two output gears. However, the use of face gears and their ability to operate successfully at the speeds and loads required for an aerospace environment was unknown. Therefore a proof-of-concept phase with an existing test stand at the NASA Lewis Research Center was pursued. Hardware was designed that could be tested in Lewis' Spiral Bevel Gear Test Rig. The initial testing indicated that the face gear mesh was a feasible design that could be used at high speeds and load. Surface pitting fatigue was the typical failure mode, and that could lead to tooth fracture. An interim project was conducted to see if slight modifications to the gear tooth geometry or an alternative heat treating process could overcome the surface fatigue problems. From the initial and interim tests, it was apparent that for the surface fatigue problems to be overcome the manufacturing process used for this component would have to be developed to the level used for spiral bevel gears. The current state of the art for face gear manufacturing required using less than optimal gear materials and manufacturing techniques because the surface of the tooth form does not receive final finishing after heat treatment as it does for spiral bevel gears. This resulted in less than desirable surface hardness and manufacturing tolerances. An Advanced Research and Projects Agency (ARPA) Technology Reinvestment Project has been funded to investigate

The Effect of School Design on Student Performance

Science.gov (United States)

Ariani, Mohsen Ghasemi; Mirdad, Fatemeh

2016-01-01

The present study aims at exploring the influence of school design on student performance. The participants consisted of 150 students who studied at two Iranian public school and private school in Mashhad City. School Design and Planning Laboratory (SDPL) model of Georgia University (and Tanner (2009)) was used as an appraisal indicator of school…

School-level factors associated with increased fruit and vegetable consumption among students in California middle and high schools.

Science.gov (United States)

Gosliner, Wendi

2014-09-01

This study assessed associations between selective school-level factors and students' consumption of fruits and vegetables at school. Better understanding of school factors associated with increased produce consumption is especially important, as students are served more produce items at school. This cross-sectional study included 5439 seventh- and ninth-grade students from 31 schools in California in 2010. Multilevel regression models estimated whether the odds of consuming fruits or vegetables at school among students eating the school lunch were associated with the length of the lunch period, quality/variety of produce options, or other factors. A longer lunch period was associated with increased odds of a student eating fruits (odds ratio [OR] = 1.40) and vegetables (OR = 1.54) at school. Better fruit quality increased the odds of a student consuming fruit (OR = 1.44). Including a salad bar and involving students in food service decisions increased a student's odds of consuming vegetables (OR = 1.48 and OR = 1.34, respectively). This study suggests that institutional factors in schools are positively associated with middle and high school students' consumption of produce items at school. Additional efforts to structure school meal environments to enhance students' consumption of produce items can benefit students' nutrition and health. © 2014, American School Health Association.

Relationships between bullying, school climate, and student risk behaviors.

Science.gov (United States)

Klein, Jennifer; Cornell, Dewey; Konold, Timothy

2012-09-01

This study examined whether characteristics of a positive school climate were associated with lower student risk behavior in a sample of 3,687 high school students who completed the School Climate Bullying Survey and questions about risk behavior from the Youth Risk Behavior Surveillance Survey (YRBS). Confirmatory factor analyses established fit for 20 items with three hypothesized school climate scales measuring (1) prevalence of bullying and teasing; (2) aggressive attitudes; and (3) student willingness to seek help. Structural equation modeling established the relationship of these measures with student reports of risk behavior. Multigroup analyses identified differential effects across gender and race. A positive school climate could be an important protective factor in preventing student risk behavior.

50 CFR 622.46 - Prevention of gear conflicts.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Prevention of gear conflicts. 622.46... Management Measures § 622.46 Prevention of gear conflicts. (a) No person may knowingly place in the Gulf EEZ any article, including fishing gear, that interferes with fishing or obstructs or damages fishing gear...

Review of "Everyone Wins: How Charter Schools Benefit All New York City Public School Students"

Science.gov (United States)

McEwan, Patrick J.

2009-01-01

The report examines whether increasing competition from charter schools has a causal effect on the achievement of public school students in New York City, using a three-year longitudinal database of student test scores. As a measure of competition, it considers the percentage of students who left a public school for a charter school in the prior…

An evaluation of primary school students' views about noise levels in school

Directory of Open Access Journals (Sweden)

Nermin Bulunuz

2017-06-01

Full Text Available Effective education and teaching requires keeping classroom noise levels within specific limits. The purpose of this study is to evaluate students’ views about the noise level in school, its effects, and control of it at two primary schools (one public school and one private school located in a district of Bursa - within the scope of the TÜBİTAK 1001 project numbered 114K738. The research sample consists of 432 third and fourth graders, 223 of whom are from the public school and 209 of whom are from the private school. To collect data, a 20-question survey was administered to the students, and noise measurements were carried out in the schools. According to the findings obtained from the analysis of the answers from the student questionnaire, the students think that the noise level is high especially during break times. In parallel with the student views, the average noise level at break time during recess was found to be 74.56 dBA at the private primary school and 82.18 dBA at the public primary school. These values are much higher than the limits prescribed in the Regulation on Assessment and Management of Environmental Noise in Turkey (RAMEN European Union Harmonization Laws. The research findings show that this important problem must be dealt with urgently, and substantive efforts and activities must be launched to reduce high noise levels in schools.

Students' personal traits, violence exposure, family factors, school dynamics and the perpetration of violence in Taiwanese elementary schools.

Science.gov (United States)

Chen, Ji-Kang; Astor, Ron Avi

2011-02-01

School violence has become an international problem affecting the well-being of students. To date, few studies have examined how school variables mediate between personal and family factors and school violence in the context of elementary schools in Asian cultures. Using a nationally representative sample of 3122 elementary school students in Taiwan, this study examined a theoretical model proposing that negative personal traits, exposure to violence and parental monitoring knowledge have both direct influences as well as indirect influences mediated through school engagement, at-risk peers and poor student-teacher relationships on school violence committed by students against students and teachers. The results of a structural equation modeling analysis provided a good fit for the sample as a whole. The final model accounted for 32% of the variance for student violence against students and 21% for student violence against teachers. The overall findings support the theoretical model proposed in this study. Similar findings were obtained for both male and female students. The study indicated that to reduce school violence more effectively in the context of elementary schools, intervention may exclusively focus on improving students' within-school experiences and the quality of the students' relationships with teachers and school peers.

Research on the Problem of Spur Gear Teeth Contact in the Car Gear Box

Directory of Open Access Journals (Sweden)

Viktor Skrickij

2011-04-01

Full Text Available The article presents research on the problem of two gear contact in the car gearbox. Contact stiffness is evaluated for the whole period of mesh. Also, contact stresses are evaluated in the contact place. The presented method can be used for calculating spur gear.Article in Lithuanian

50 CFR 622.31 - Prohibited gear and methods.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Prohibited gear and methods. 622.31... Management Measures § 622.31 Prohibited gear and methods. In addition to the prohibited gear/methods specified in this section, see §§ 622.33, 622.34, and 622.35 for seasonal/area prohibited gear/methods and...

50 CFR 640.22 - Gear and diving restrictions.

Science.gov (United States)

2010-10-01

... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Gear and diving restrictions. 640.22... ATLANTIC Management Measures § 640.22 Gear and diving restrictions. (a) Prohibited gear and methods. (1) A spiny lobster may not be taken in the EEZ with a spear, hook, or similar device, or gear containing such...

Should Students Engaged to Their Study? (Academic Burnout and School-Engagement among Students

Directory of Open Access Journals (Sweden)

Fitri Arlinkasari

2017-08-01

Full Text Available Inability to deal with lectures efficiently leads students vulnerable to academic burnout. Burnout contributes to the high dropout rate among students, and this phenomenon has occurred on several universities in Indonesia. To overcome these problems, students should generate the feelings, attitudes and positive attitude towards the academic demands, or known as school engagement. School involvement is a predictor of students’ dropout rate. This study aims to analyze the dropout problem in many private universities in Jakarta by examining the psychological variables: academic burnout and school engagement. 208 students from some private university in Jakarta participated and fulfilled two questionnaires: academic burnout and school engagement that has been modified to suit the college setting. Correlation of the variables showed r= - 0.399 (p = 0.000. This means that school engagement plays a role in reducing academic burnout among students. These findings contribute a reference for academic counseling to support the decreasing of students’ dropout rate.

Bifurcation phenomena in internal dynamics of gear systems

Directory of Open Access Journals (Sweden)

Hortel M.

2007-10-01

Full Text Available The impact effects in gear mesh represent specific phenomena in the dynamic investigation of highspeed light transmission systems with kinematic couplings. They are caused of greater dynamic than static elastic deformations in meshing gear profiles. In term of internal dynamics they are influenced among others by time heteronomous stiffness functions in gear mesh and resonance tuning of stiffness level. The damping in gear mesh and in gear system is concerned significantly in the amplitude progress, greatness and phase shift of relative motion towards stiffness function alternatively towards its modify form in gear mesh. In consequence of these and another actions rise above resonance characteristics certain singular locations with jump amplitude course.

Distribution of immorality in attitudes of students towards school misbehaviour

Directory of Open Access Journals (Sweden)

Peruničić Ivana

2011-01-01

Full Text Available The aim of this study was to investigate the distribution of immorality in attitudes of students towards school misbehaviour (codes of behaviour at school and whether the intensity of agreement with school misbehaviour is relative to student age. The research was conducted on the territory of Serbia and included 11 primary schools, 12 secondary schools and 2 faculties. The sample consisted of 1847 students (the gender was almost evenly distributed, who were administered the School Misbehaviour Scale. The scale showed a high reliability. We examined the following misbehaviours at school: attitudes towards exam cheating, truancy, answer whispering, falsifying school documents, rationalising violence towards teachers, bribery and corruption, school nepotism and general attitudes towards misbehaviour. The results showed that a great number of students agreed with school misbehaviour; exam cheating and answer whispering are the most common misbehaviours agreed with by students. Significant age differences in the agreement with school misbehaviour were established; the development line of approval of school misbehaviour is fairly equal for all types of school misbehaviour and shows that fourth grade students in primary school least approve of school misbehaviour, followed by sixth grade students. Seventh grade figures as the period when agreement with almost all types of school misbehaviour starts to increase. This is an upward and continuous trend during the eighth grade, as well as in the first and second grade of secondary school. In the third grade, agreement with misbehaviour starts to decrease and this trend continues through the fourth grade of secondary school and at the faculty.

School-located influenza vaccination and absenteeism among elementary school students in a Hispanic community.

Science.gov (United States)

Keck, Patricia C; Ynalvez, Marcus Antonius; Gonzalez, Hector F; Castillo, Keila D

2013-08-01

Seasonal influenza is recognized as a significant health burden to children and is a cause of excess school absenteeism in children. In 2008, the Advisory Committee on Immunization Practices recommended annual influenza vaccination for all children 6 months to 18 years of age. School nurses influence participation in this recommendation by conducting school-located influenza vaccination (SLIV) programs at their campuses. Knowing the effect of SLIV programs on student absenteeism may motivate school nurses and district administrators to conduct such vaccination programs. This study examines the impact of an SLIV program on elementary school absenteeism in an inner city school district with a predominantly Hispanic population. Using Poisson regression models with robust standard errors, we analyzed data from 3,775 records obtained by stratified random sampling. Results of the study indicate that students vaccinated through an SLIV program have fewer absences than unvaccinated students. A surprising result of the study shows that students vaccinated through an SLIV program had fewer absences than students vaccinated elsewhere. These results are of particular importance to school nurses who work with large Hispanic populations. Our study illustrates one way that a school nurse can assess the effect of an SLIV program on absenteeism.

The Relationship Among School Safety, School Liking, and Students' Self-Esteem: Based on a Multilevel Mediation Model.

Science.gov (United States)

Zhang, Xinghui; Xuan, Xin; Chen, Fumei; Zhang, Cai; Luo, Yuhan; Wang, Yun

2016-03-01

Perceptions of school safety have an important effect on students' development. Based on the model of "context-process-outcomes," we examined school safety as a context variable to explore how school safety at the school level affected students' self-esteem. We used hierarchical linear modeling to examine the link between school safety at the school level and students' self-esteem, including school liking as a mediator. The data were from the National Children's Study of China (NCSC), in which 6618 fourth- to fifth-grade students in 79 schools were recruited from 100 counties in 31 provinces in China. Multilevel mediation analyses showed that the positive relationship between school safety at the school level and self-esteem was partially mediated by school liking, controlling for demographics at both student and school levels. Furthermore, a sex difference existed in the multilevel mediation model. For boys, school liking fully mediated the relationship between school safety at the school level and self-esteem. However, school liking partially mediated the relationship between school safety at the school level and self-esteem among girls. School safety should receive increasing attention from policymakers because of its impact on students' self-esteem. © 2016, American School Health Association.

Organ and tissue donation: what do high school students know?

Directory of Open Access Journals (Sweden)

Marcela Cristina de Lemos

2007-09-01

Full Text Available Objectives: To know the opinion of senior high school students in publicand private schools on the process of donating and transplanting organsand tissues, and their desire to be donors. Methods: A descriptive crosssectionalstudy, conducted from 2004 to 2005, on the opinion/knowledgeof senior high school students in public and private schools in the VilaMariana region of the city of São Paulo, on the process of organ and tissuedonation and transplantation. The convenience sample was made up of140 (81% students from two private schools and 167 (51% studentsfrom a public school. The project was approved by the Research EthicsCommittee of the UNIFESP. Results: Data showed that 163 (53.1%students believe that donation is by presumed consent and 147 (47.9%that consider that it occurs by informed consent. Of the public schoolstudents, 120 (71.9% believe that transplants are public and free ofcharge in Brazil versus 94 (67.1% of the students from private schools.Students know that donations may be made by living or dead donors(121 - 86.4% private schools versus 113 – 67.7% public school. Wehighlight that 22 (15.7% of the private school students and 16 (9.6%of those from the public school believe that the commerce of organs isallowed in Brazil. As to intentions of being a donor, 108 (77.1% of theprivate school students declared themselves organ and tissue donorsversus 106 (63.5% from the public school, and 63 (59.4% from thepublic versus 61 (56.5% from the private schools have already informedtheir families. Conclusion: There was no difference in knowledge andopinion among the students from the public and private schools as toaspects regarding donation and transplantation.

School Shootings and Student Performance

OpenAIRE

Panu Poutvaara; Olli Ropponen

2010-01-01

In this paper, we study how high school students reacted to the shocking news of a school shooting. The shooting coincided with national high-school matriculation exams. As there were exams both before and after the shooting, we can use a difference-in-differences analysis to uncover how the school shooting affected the test scores compared to previous years. We find that the average performance of young men declined due to the school shooting, whereas we do not observe a similar pattern for ...

Offset Compound Gear Inline Two-Speed Drive

Science.gov (United States)

Stevens, Mark A. (Inventor); Handschuh, Robert F. (Inventor); Lewicki, David G. (Inventor)

2014-01-01

A two-speed transmission having an input shaft and an output shaft, the transmission being capable of transitioning between fixed ratios, the high-range ratio being direct 1:1 and the low-range ratio being about 2:1. The transmission is a simple lightweight, yet robust, configuration utilizing only two gear meshes, being comprised of an input gear, a cluster gear, and an output gear. The transmission is controlled with a clutch and a sprag and with the input and output shafts turning in the same direction.

Middle School and High School Students Who Stutter: A Qualitative Investigation of School Experiences

Science.gov (United States)

Cobb, Tiffany R.

2017-01-01

Purpose: The purpose of this study was to explore and further understand the ways in which middle school and high school students perceive their school experiences within the school environment. School has an important impact on the social development of children (Milsom, 2006). Learning is not done individually as classrooms are inherently social…

School Factors Associated With the Percentage of Students Who Walk or Bike to School, School Health Policies and Practices Study, 2014.

Science.gov (United States)

Everett Jones, Sherry; Sliwa, Sarah

2016-05-12

Active school transport, such as by walking or biking, increases physical activity levels, which has health and academic benefits for children. We examined school demographic and other characteristics to determine their association with the percentage of students who walk or bike to school. We analyzed data from the Centers for Disease Control and Prevention's 2014 School Health Policies and Practices Study. The response rate for the module containing questions about transportation was 70% (N = 577). Multivariate logistic regression models examined whether certain school characteristics were associated with a school having 26% or more of students who walk or bike to school in the morning on an average school day. In most (61.5%) schools, 10% or fewer students walked or biked to school in the morning on an average school day; in 22.7% of schools, 26% or more students did so. Although having crossing guards (adjusted odds ratio [AOR] = 3.3; 95% confidence interval [CI], 1.9-6.0), having bicycle racks (AOR = 2.7; 95% CI, 1.2-5.8), and providing promotional materials to students or families on walking or biking to school (AOR = 2.9; 95% CI, 1.7-5.1) were associated with having 26% or more students who walk or bike to school, only 47.7% of schools had crossing guards, 62.4% had bicycle racks, and 33.3% provided promotional materials. Several low-cost or no-cost strategies were associated with having 26% or more students who walked or biked to school, but these strategies are not commonly used in schools.

Offensive Student Web Sites: What Should Schools Do?

Science.gov (United States)

Conn, Kathleen

2001-01-01

Threatening student web sites raise complex legal questions for schools. According to "Tinker v. Des Moines (1969), students' First Amendment rights must be abridged to ensure an orderly school environment. Recent litigation, educator rights, American Civil Liberties Union interventions, and legally defensible strategies for schools are…

Reducing Physical Violence Toward Primary School Students With Disabilities.

Science.gov (United States)

Devries, Karen; Kuper, Hannah; Knight, Louise; Allen, Elizabeth; Kyegombe, Nambusi; Banks, Lena Morgon; Kelly, Susan; Naker, Dipak

2018-03-01

We tested whether the Good School Toolkit reduces physical violence from peers and school staff toward students with and without disabilities in Ugandan primary schools. We conducted a cluster randomized controlled trial, with data collected via cross-sectional surveys in 2012 and 2014. Forty-two primary schools in Luwero District, Uganda, were randomly assigned to receive the Good School Toolkit for 18 months, or to a waitlisted control group. The primary outcome was past week physical violence from school staff, measured by primary 5, 6, and 7 students' (aged 11-14 years) self-reports using the International Society for the Prevention of Child Abuse and Neglect Child Abuse Screening Tool-Child Institutional. Disability was assessed through the six Short Set Washington Group questions on functioning. Analyses were by intention to treat. At endline, 53% of control group students with no functional difficulties reported violence from peers or school staff, versus 84% of students with a disability. Prevalence of past week physical violence from school staff was lower in intervention schools than in the control schools after the intervention, in students with no functional difficulties (adjusted odds ratio [aOR] = .41, 95% confidence interval [CI .26-.65]), students with some functional difficulties (aOR = .36, 95% CI .21-.63), and students with disabilities (aOR = .29, 95% CI .14-.59). The intervention also reduced violence from peers in young adolescents, with no evidence of a difference in effect by disability status. The Good School Toolkit is an effective intervention to reduce violence perpetrated by peers and school staff against young adolescents with disabilities in Ugandan primary schools. Copyright © 2017 The Society for Adolescent Health and Medicine. Published by Elsevier Inc. All rights reserved.

The Effect of High School Shootings on Schools and Student Performance

Science.gov (United States)

Beland, Louis-Philippe; Kim, Dongwoo

2016-01-01

We analyze how fatal shootings in high schools affect schools and students using data from shooting databases, school report cards, and the Common Core of Data. We examine schools' test scores, enrollment, number of teachers, graduation, attendance, and suspension rates at schools that experienced a shooting, employing a difference-in-differences…

High School Students' Self-Reported Use of School Clinics and Nurses

Science.gov (United States)

Harper, Christopher R.; Liddon, Nicole; Dunville, Richard; Habel, Melissa A.

2016-01-01

Access to school health clinics and nurses has been linked with improved student achievement and health. Unfortunately, no studies have examined how many students report using school clinics or nurses and for which services. This study addressed this gap with data from a nationally representative sample of 15- to 25-year-olds. Respondents who…

School Liability: Student to Student Injuries Involving Students with Disabilities.

Science.gov (United States)

Bettenhausen, Sherrie

In the absence of immunity, courts have held schools and school personnel liable for personal injury by a student with a disability that resulted from negligent failure to provide a reasonable safe environment, failure to warn of known hazards, or failure to provide adequate supervision. Case law is presented to demonstrate the extent that school…

Students' perceptions of school climate in the U.S. and China.

Science.gov (United States)

Yang, Chunyan; Bear, George G; Chen, Fang Fang; Zhang, Wei; Blank, Jessica C; Huang, Xishan

2013-03-01

Although the construct of student climate has been studied extensively in the United States, we know little about how school climate is perceived in other countries. With large class sizes yet higher academic achievement and less disruptive and aggressive student behaviors, schools in China present a contrast to many schools in the United States. Differences in school climate between the two countries were examined in this study. The sample consisted of 10,400 American and 3,435 Chinese students across three grade levels (elementary, middle, and high school) in 85 American and 22 Chinese schools. Factor structure and measurement invariance across countries were first established for the Modified-Delaware School Climate Survey-Student. Differences in latent means were then tested. Across all three grade levels Chinese students scored significantly higher than American students on all four subscales (Teacher-Student Relations, Student-Student Relations, School Liking, and Fairness of School Rules). Effects sizes tended to be smallest in elementary schools and largest in middle schools. Significant differences between American and Chinese students exist in their perceptions of school climate. It is likely that those differences can be attributed to cultural differences in respect of authority, academic and social values, self-regulation and peer-regulation of behaviors, and teachers' classroom management. PsycINFO Database Record (c) 2013 APA, all rights reserved.

Relationships Among Student-body Composition, School Process, and Mathematics Achievement in Argentina’s High Schools

Directory of Open Access Journals (Sweden)

Rubén Alberto Cervini Iturre

2003-05-01

Full Text Available This is a study of the relationships between the student-body composition of the school, some characteristics of the scholastic process—culture and school climate—according to learners’ perceptions, and the mathematics achievement of students in the last year of high school in Argentina. The data used came from the 1998 National Census of High School Completion, carried out by the nation’s Ministry of Culture and Education. The file contains data for 135,000 students of 2,708 schools in 25 states. Multilevel linear modeling with three levels (student, school and state was applied. A strong relationship was detected between mathematics achievement and the variables student-body composition and school process. When both variables acted together, the effect of other variables experienced a pronounced descent. Although reduced, the variables of the process influenced the student’s achievement. There was identified for future works a reference model which would evaluate other institutional learning factors.

High School Students' Perception of University Students as STEM Representatives

DEFF Research Database (Denmark)

Poulsen, Eva Lykkegaard

’ potential identities. It shows that the students preferred STEM representatives resembled themselves in some aspects (primarily social and health aspects) and fit their perceptions of a typical person working in STEM in other aspects (knowledge seeking, hard-working etc.). At least two different...... studies, it is important to introduce high school students to good STEM representatives to make possible the development of potential STEM identities. A potential identity within a specific subject area relies on at least a situation bound relation-ship to the subject area or the person representing it....... Some representatives transmit infor-mation and are thereby definers, whereas other representatives illustrates as personal examples and are thereby models. This study focuses on high school students’ views on STEM representatives and the impact these representatives have on the high school students...

46 CFR 61.20-1 - Steering gear.

Science.gov (United States)

2010-10-01

... 46 Shipping 2 2010-10-01 2010-10-01 false Steering gear. 61.20-1 Section 61.20-1 Shipping COAST... Periodic Tests of Machinery and Equipment § 61.20-1 Steering gear. (a) The marine inspector must inspect the steering gear at each inspection for certification for vessels whose Certificate of Inspections...

School Counselors and Multiracial Students: Factors, Supports, and Interventions

Science.gov (United States)

White, Marie M.; Grimes, Lee Edmondson

2015-01-01

Multiracial students represent a growing population in school systems today. This diverse group of students and their families may encounter many challenges and race-specific issues in the school setting. School counselors are in a unique position to assist these students and their families to become successful in meeting these challenges. The…

Career/Education Plans and Student Engagement in Secondary School

Science.gov (United States)

Plasman, Jay Stratte

2018-01-01

Student engagement in education is key to ensuring successful learning. Engagement becomes crucial as students progress through high school and transition into young adulthood; however, engaging them in high school can be an arduous task. A career/education plan can help students make strong connections between their work in high school and their…

Peer sexual harassment victimization at school: the roles of student characteristics, cultural affiliation, and school factors.

Science.gov (United States)

Attar-Schwartz, Shalhevet

2009-07-01

This study examines the links between students' reports of sexual harassment victimization by peers and a number of individual and school contextual factors. It is based on a nationally representative sample of 16,604 students in Grades 7 through 11 in 327 schools across Israel who completed questionnaires during class. Hierarchical Linear Modeling was used to examine the links. Overall, approximately one in four students (25.6%) were victims of at least one unwanted and unwelcome act of harassment by peers (such as being touched or pinched in sexual manner) in the prior month. The most vulnerable groups were Israeli-Arab boys and students with negative perceptions of their school climate. The school correlates associated with higher levels of victimization were a higher share of students with less-educated parents, larger schools and classrooms, and negative school climate. The interactions between gender and school-related factors indicate that the gender patterns are different for Israeli-Arab and Jewish schools and for schools with different concentrations of students' families with low socioeconomic status. The study emphasizes the need for an ecological perspective in addressing school-based sexual harassment.

Diagnostics of power transmissions system with tooth gear

Directory of Open Access Journals (Sweden)

Grzegorz WOJNAR

2008-01-01

Full Text Available This paper presents results of laboratory tests that were aimed at detecting early stages of various faults in toothed wheels by measurement and analysis of transverse vibration speed of the transmission gear shafts. In experimental investigation, cracking of the root tooth and chipping of the tooth were detected. The laser vibrometer Ometron VH300+ was used for non-contact measurement of shaft transversal vibration speed. Gear vibrations were recorded in selected points of gear housing and gear shafts at different speeds and gear loads. Results were analyzed and compared but in this paper is presented only selected examples. This paper shows that on the basis of the transverse vibration speed of transmission gear shafts, it is possible to detect defects at an earlier stage than on the basis of the housing vibration accelerations. In the case of measuring gear shaft vibration velocity, the way of the signal generated by the defect of a gear wheel (or bearing is shortened as well as the influence of composed transmittance of the bearing-gear housing system is eliminated. WV time-frequency analysis and complex continuous wavelet transformations were used for detection. The authors introduced a measure of local tooth damage, which was proportional to the size of damage. The results of research presented in this paperconfirmed that the defect's measure is very sensitive to the development of teeth faults.

The Impact of School Climate and School Identification on Academic Achievement: Multilevel Modeling with Student and Teacher Data.

Science.gov (United States)

Maxwell, Sophie; Reynolds, Katherine J; Lee, Eunro; Subasic, Emina; Bromhead, David

2017-01-01

School climate is a leading factor in explaining student learning and achievement. Less work has explored the impact of both staff and student perceptions of school climate raising interesting questions about whether staff school climate experiences can add "value" to students' achievement. In the current research, multiple sources were integrated into a multilevel model, including staff self-reports, student self-reports, objective school records of academic achievement, and socio-economic demographics. Achievement was assessed using a national literacy and numeracy tests ( N = 760 staff and 2,257 students from 17 secondary schools). In addition, guided by the "social identity approach," school identification is investigated as a possible psychological mechanism to explain the relationship between school climate and achievement. In line with predictions, results show that students' perceptions of school climate significantly explain writing and numeracy achievement and this effect is mediated by students' psychological identification with the school. Furthermore, staff perceptions of school climate explain students' achievement on numeracy, writing and reading tests (while accounting for students' responses). However, staff's school identification did not play a significant role. Implications of these findings for organizational, social, and educational research are discussed.

The Impact of School Climate and School Identification on Academic Achievement: Multilevel Modeling with Student and Teacher Data

Directory of Open Access Journals (Sweden)

Sophie Maxwell

2017-12-01

Full Text Available School climate is a leading factor in explaining student learning and achievement. Less work has explored the impact of both staff and student perceptions of school climate raising interesting questions about whether staff school climate experiences can add “value” to students' achievement. In the current research, multiple sources were integrated into a multilevel model, including staff self-reports, student self-reports, objective school records of academic achievement, and socio-economic demographics. Achievement was assessed using a national literacy and numeracy tests (N = 760 staff and 2,257 students from 17 secondary schools. In addition, guided by the “social identity approach,” school identification is investigated as a possible psychological mechanism to explain the relationship between school climate and achievement. In line with predictions, results show that students' perceptions of school climate significantly explain writing and numeracy achievement and this effect is mediated by students' psychological identification with the school. Furthermore, staff perceptions of school climate explain students' achievement on numeracy, writing and reading tests (while accounting for students' responses. However, staff's school identification did not play a significant role. Implications of these findings for organizational, social, and educational research are discussed.

Structural Intervention With School Nurses Increases Receipt of Sexual Health Care Among Male High School Students.

Science.gov (United States)

Dittus, Patricia J; Harper, Christopher R; Becasen, Jeffrey S; Donatello, Robin A; Ethier, Kathleen A

2018-01-01

Adolescent males are less likely to receive health care and have lower levels of sexual and reproductive health (SRH) knowledge than adolescent females. The purpose of this study was to determine if a school-based structural intervention focused on school nurses increases receipt of condoms and SRH information among male students. Interventions to improve student access to sexual and reproductive health care were implemented in six urban high schools with a matched set of comparison schools. Interventions included working with school nurses to improve access to sexual and reproductive health care, including the provision of condoms and information about pregnancy and sexually transmitted disease prevention and services. Intervention effects were assessed through five cross-sectional yearly surveys, and analyses include data from 13,740 male students. Nurses in intervention schools changed their interactions with male students who visited them for services, such that, among those who reported they went to the school nurse for any reason in the previous year, those in intervention schools reported significant increases in receipt of sexual health services over the course of the study compared with students in comparison schools. Further, these results translated into population-level effects. Among all male students surveyed, those in intervention schools were more likely than those in comparison schools to report increases in receipt of sexual health services from school nurses. With a minimal investment of resources, school nurses can become important sources of SRH information and condoms for male high school students. Published by Elsevier Inc.

The Prehistory of Discovery: Precursors of Representational Change in Solving Gear System Problems.

Science.gov (United States)

Dixon, James A.; Bangert, Ashley S.

2002-01-01

This study investigated whether the process of representational change undergoes developmental change or different processes occupy different niches in the course of knowledge acquisition. Subjects--college, third-, and sixth-grade students--solved gear system problems over two sessions. Findings indicated that for all grades, discovery of the…

Secondary School Student's Attitude towards Consumer

African Journals Online (AJOL)

FIRST LADY

Keywords: Consumer Education, Attitude, Home Economics, Secondary. School Students. ... Home Management taught at Senior Secondary School level. Today ..... indicate that facilities for teaching Consumer Education especially textbooks.

A Computational Investigation of Gear Windage

Science.gov (United States)

Hill, Matthew J.; Kunz, Robert F.

2012-01-01

A CFD method has been developed for application to gear windage aerodynamics. The goals of this research are to develop and validate numerical and modeling approaches for these systems, to develop physical understanding of the aerodynamics of gear windage loss, including the physics of loss mitigation strategies, and to propose and evaluate new approaches for minimizing loss. Absolute and relative frame CFD simulation, overset gridding, multiphase flow analysis, and sub-layer resolved turbulence modeling were brought to bear in achieving these goals. Several spur gear geometries were studied for which experimental data are available. Various shrouding configurations and free-spinning (no shroud) cases were studied. Comparisons are made with experimental data from the open literature, and data recently obtained in the NASA Glenn Research Center Gear Windage Test Facility. The results show good agreement with experiment. Interrogation of the validative and exploratory CFD results have led, for the first time, to a detailed understanding of the physical mechanisms of gear windage loss, and have led to newly proposed mitigation strategies whose effectiveness is computationally explored.

School Factors Associated With the Percentage of Students Who Walk or Bike to School, School Health Policies and Practices Study, 2014

Science.gov (United States)

Sliwa, Sarah

2016-01-01

Introduction Active school transport, such as by walking or biking, increases physical activity levels, which has health and academic benefits for children. We examined school demographic and other characteristics to determine their association with the percentage of students who walk or bike to school. Methods We analyzed data from the Centers for Disease Control and Prevention’s 2014 School Health Policies and Practices Study. The response rate for the module containing questions about transportation was 70% (N = 577). Multivariate logistic regression models examined whether certain school characteristics were associated with a school having 26% or more of students who walk or bike to school in the morning on an average school day. Results In most (61.5%) schools, 10% or fewer students walked or biked to school in the morning on an average school day; in 22.7% of schools, 26% or more students did so. Although having crossing guards (adjusted odds ratio [AOR] = 3.3; 95% confidence interval [CI], 1.9–6.0), having bicycle racks (AOR = 2.7; 95% CI, 1.2–5.8), and providing promotional materials to students or families on walking or biking to school (AOR = 2.9; 95% CI, 1.7–5.1) were associated with having 26% or more students who walk or bike to school, only 47.7% of schools had crossing guards, 62.4% had bicycle racks, and 33.3% provided promotional materials. Conclusion Several low-cost or no-cost strategies were associated with having 26% or more students who walked or biked to school, but these strategies are not commonly used in schools. PMID:27172258

Evaluation Of Vibration-Monitoring Gear-Diagnostic System

Science.gov (United States)

Townsend, Dennis P.; Zakrajsek, James J.

1995-01-01

Report describes experimental evaluation of commercial electronic system designed to monitor vibration signal from accelerometer on gear-box to detect vibrations indicative of damage to gears. System includes signal-conditioning subsystem and personal computer in which analog-to-digital converter installed. Results show system fairly effective in detecting surface fatigue pits on spur-gear teeth.

46 CFR 182.610 - Main steering gear.

Science.gov (United States)

2010-10-01

... 46 Shipping 7 2010-10-01 2010-10-01 false Main steering gear. 182.610 Section 182.610 Shipping...) MACHINERY INSTALLATION Steering Systems § 182.610 Main steering gear. (a) A vessel must be provided with a main steering gear that is: (1) Of adequate strength and capable of steering the vessel at all service...

Homeless High School Students in America: Who Counts?

Science.gov (United States)

Cumming, John M.; Gloeckner, Gene W.

2012-01-01

After interviewing homeless high school students, the research team in a Colorado school district discovered that many students had not revealed their true living conditions (homelessness) to anyone in the school district. This research team developed an anonymous survey written around the homeless categories identified in the McKinney-Vento…

Corporal Punishment and Student Outcomes in Rural Schools

Science.gov (United States)

Han, Seunghee

2014-01-01

This study examined the effects of corporal punishment on student outcomes in rural schools by analyzing 1,067 samples from the School Survey on Crime and Safety 2007-2008. Results of descriptive statistics and multivariate regression analyses indicated that schools with corporal punishment may decrease students' violent behaviors and…

Copycat snacks: Can students differentiate between school and store snacks?

Science.gov (United States)

Mann, Georgianna

2018-02-01

In 2014, the national Smart Snacks in School nutrition standards placed regulations on all snack foods sold in schools. Many food companies reformulated common snack food products for sale in schools, called "copycat snacks", which look similar to nutritionally different foods sold in stores. It is possible that these snacks create consumer confusion among students. The purpose of this study was to determine if middle school students could differentiate, in taste and appearance, between school (copycat) and store versions of common snacks. Seventy-six middle school students evaluated three different food products offered in schools: Froot Loops, Rice Krispy Treats, and Doritos. Students tasted snacks in a series of triangle tests for difference, one for each snack food, including school and store versions. Students were also presented with packages, school and store versions of the same products, and asked to determine the expected taste, purchase intentions, and perceived healthfulness. Students could determine taste differences between school and store Rice Krispy Treats yet could not differentiate between Froot Loop and Dorito varieties. Students rated store versions of all three snacks with greater expected taste, higher intention to purchase, and as less healthy. While it seems product confusion concerning copycat snacks may not be severe in this sample, snack food brands are still a prominent feature in schools. It is possible that these copycat snacks can confuse students' perceptions of healthy foods. Alternative packaging for school foods or reformation of store versions of snack foods may be viable solutions to this problem. Copyright © 2017 Elsevier Ltd. All rights reserved.

Inequality in Black and White High School Students' Perceptions of School Support: An Examination of Race in Context.

Science.gov (United States)

Bottiani, Jessika H; Bradshaw, Catherine P; Mendelson, Tamar

2016-06-01

Supportive relationships with adults at school are critical to student engagement in adolescence. Additional research is needed to understand how students' racial backgrounds interact with the school context to shape their perceptions of school support. This study employed multilevel, latent variable methods with a sample of Black and White students (N = 19,726, 35.8 % Black, 49.9 % male, mean age = 15.9) in 58 high schools to explore variation in perceived caring, equity, and high expectations by student race, school diversity, and socioeconomic context. The results indicated that Black students perceived less caring and equity relative to White students overall, and that equity and high expectations were lower in diverse schools for both Black and White students. Nonetheless, racial disparities were attenuated in more diverse schools. The findings point to the need for intervention to improve perceptions of school support for Black youth and for all students in lower income and more diverse schools.

High school students with asthma: attitudes about school health, absenteeism, and its impact on academic achievement.

Science.gov (United States)

Krenitsky-Korn, Susan

2011-01-01

Asthma is the most frequent reason for absence from school; it accounts for one-third of all days of missed instruction, placing students at risk for academic failure and social isolation. This study compared high school students with asthma with those without asthma, and examined the relationship of their attitudes toward school health services, absenteeism, academic achievement, and the supposition that school nurse services play an essential part in the academic process. Surveys were completed by all students who participated in the study. Twenty-eight students with asthma reported levels of illness and school nurse support in an additional survey. Data revealed that students with asthma were absent more frequently, scored lower in mathematics, and participated less in school activities than their peers without asthma. Their level of illness did not predict the number of days absent, which was negatively correlated with achievement and positively correlated with students' permissive attitudes toward absenteeism. Findings indicate that school nurse interventions were sources of physical, social, emotional, and academic support.

Doctors of tomorrow: An innovative curriculum connecting underrepresented minority high school students to medical school.

Science.gov (United States)

Derck, Jordan; Zahn, Kate; Finks, Jonathan F; Mand, Simanjit; Sandhu, Gurjit

2016-01-01

Racial minorities continue to be underrepresented in medicine (URiM). Increasing provider diversity is an essential component of addressing disparity in health delivery and outcomes. The pool of students URiM that are competitive applicants to medical school is often limited early on by educational inequalities in primary and secondary schooling. A growing body of evidence recognizing the importance of diversifying health professions advances the need for medical schools to develop outreach collaborations with primary and secondary schools to attract URiMs. The goal of this paper is to describe and evaluate a program that seeks to create a pipeline for URiMs early in secondary schooling by connecting these students with support and resources in the medical community that may be transformative in empowering these students to be stronger university and medical school applicants. The authors described a medical student-led, action-oriented pipeline program, Doctors of Tomorrow, which connects faculty and medical students at the University of Michigan Medical School with 9th grade students at Cass Technical High School (Cass Tech) in Detroit, Michigan. The program includes a core curriculum of hands-on experiential learning, development, and presentation of a capstone project, and mentoring of 9th grade students by medical students. Cass Tech student feedback was collected using focus groups, critical incident written narratives, and individual interviews. Medical student feedback was collected reviewing monthly meeting minutes from the Doctors of Tomorrow medical student leadership. Data were analyzed using thematic analysis. Two strong themes emerged from the Cass Tech student feedback: (i) Personal identity and its perceived effect on goal achievement and (ii) positive affect of direct mentorship and engagement with current healthcare providers through Doctors of Tomorrow. A challenge noted by the medical students was the lack of structured curriculum beyond the 1st

Demographic Factors Affecting Internet Using Purposes of High School Students

OpenAIRE

Abdullah Faruk Kılıç; Cem Oktay Güzeller

2017-01-01

This study aimed at determining the impact of demographic factors on the Internet usage purposes of high school students. The population of the study consisted of students between 9th and 12th grades from the Anatolian high schools, science high schools, social sciences high schools, sports high schools and fine arts high schools in Turkey. The sample was chosen through the stratified and cluster sampling procedure. The students were chosen randomly depending on the regions of their school at...

Promoting healthy computer use among middle school students: a pilot school-based health promotion program.

Science.gov (United States)

Ciccarelli, Marina; Portsmouth, Linda; Harris, Courtenay; Jacobs, Karen

2012-01-01

Introduction of notebook computers in many schools has become integral to learning. This has increased students' screen-based exposure and the potential risks to physical and visual health. Unhealthy computing behaviours include frequent and long durations of exposure; awkward postures due to inappropriate furniture and workstation layout, and ignoring computer-related discomfort. Describe the framework for a planned school-based health promotion program to encourage healthy computing behaviours among middle school students. This planned program uses a community- based participatory research approach. Students in Year 7 in 2011 at a co-educational middle school, their parents, and teachers have been recruited. Baseline data was collected on students' knowledge of computer ergonomics, current notebook exposure, and attitudes towards healthy computing behaviours; and teachers' and self-perceived competence to promote healthy notebook use among students, and what education they wanted. The health promotion program is being developed by an inter-professional team in collaboration with students, teachers and parents to embed concepts of ergonomics education in relevant school activities and school culture. End of year changes in reported and observed student computing behaviours will be used to determine the effectiveness of the program. Building a body of evidence regarding physical health benefits to students from this school-based ergonomics program can guide policy development on the healthy use of computers within children's educational environments.

Involute Spur Gear Template Development by Parametric Technique ...

African Journals Online (AJOL)

Nekky Umera

cylindrical coordinate systems to create the involute curve profile. Since spur gear ... Template gear development using parametric method means that the dimensions control the ... and rapid prototyping of interlocking gears. Excel is a common ...

The Interplay of Students' School Engagement, School Self-Concept and Motivational Relations during Adolescence.

Science.gov (United States)

Bakadorova, Olga; Raufelder, Diana

2017-01-01

Existing literature evidences the association between adolescents' school self-concept and engagement, both concepts being related to students' perception of teachers and peers as motivators. However, few longitudinal studies explore the interplay of these factors. The present study aims to close this gap, applying latent cross-lagged panel design to two-wave data from German adolescent students [1088 8th grade students at T1 ( M age = 13.7, SD = 0.53; 53.9% girls) and 845 9th grade students at T2 ( M age = 14.86; SD = 0.57; 55% girls) from the initial sample]. Besides direct effects, three cross-lagged over-time paths were found to be significant: students' perception of peers as positive motivators (PPMs) at the beginning of 8th grade (T1) positively predicts their behavioral school engagement at the end of 9th grade (T2), as well as emotional school engagement at the beginning of 8th grade positively predicts students' perception of PPMs 1.5 years later. Furthermore, behavioral school engagement at T1 functions as a predictor of a student's school self-concept at T2.

New generation methods for spur, helical, and spiral-bevel gears

Science.gov (United States)

Litvin, F. L.; Tsung, W.-J.; Coy, J. J.; Handschuh, R. F.; Tsay, C.-B. P.

1987-01-01

New methods for generating spur, helical, and spiral-bevel gears are proposed. These methods provide the gears with conjugate gear tooth surfaces, localized bearing contact, and reduced sensitivity to gear misalignment. Computer programs have been developed for simulating gear meshing and bearing contact.

Adaptive landing gear concept—feedback control validation

Science.gov (United States)

Mikulowski, Grzegorz M.; Holnicki-Szulc, Jan

2007-12-01

The objective of this paper is to present an integrated feedback control concept for adaptive landing gears (ALG) and its experimental validation. Aeroplanes are subjected to high dynamic loads as a result of the impact during each landing. Classical landing gears, which are in common use, are designed in accordance with official regulations in a way that ensures the optimal energy dissipation for the critical (maximum) sink speed. The regulations were formulated in order to ensure the functional capability of the landing gears during an emergency landing. However, the landing gears, whose characteristics are optimized for these critical conditions, do not perform well under normal impact conditions. For that situation it is reasonable to introduce a system that would adapt the characteristics of the landing gears according to the sink speed of landing. The considered system assumes adaptation of the damping force generated by the landing gear, which would perform optimally in an emergency situation and would adapt itself for regular landings as well. This research covers the formulation and design of the control algorithms for an adaptive landing gear based on MR fluid, implementation of the algorithms on an FPGA platform and experimental verification on a lab-scale landing gear device. The main challenge of the research was to develop a control methodology that could operate effectively within 50 ms, which is assumed to be the total duration of the phenomenon. The control algorithm proposed in this research was able to control the energy dissipation process on the experimental stand.

Motivation and Ways to Motivate Students of Middle School

Institute of Scientific and Technical Information of China (English)

朱洪琼

2012-01-01

Motivation is critical in English learning of middle school,thus,how to effectively motivate students in English learning is an important problem.This study intends to find ways to motivate students of middle school.Self-report data were collected from 45 students in The Experiment Middle School Attached to Yunnan Normal University by using a close-ended questionnaire.

High School Band Students' Perspectives of Teacher Turnover

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Kloss, Thomas E.

2013-01-01

Teacher turnover remains an important issue in education. The least researched perspectives, though, are those of the students who experience teacher turnover. The purpose of this study was to examine how high school band students experience teacher turnover. A total of twelve students were interviewed, representing three schools that experienced…

Education of Social Responsibility among Sports Schools Students

Science.gov (United States)

Malinauskas, Romualdas K.; Juodsnukis, Dalius R.

2017-01-01

Research aim was to analyze peculiarities of education of social responsibility among football sports school students. We hypothesized that after the educational program sport school students will have more developed social responsibility. The total sample comprised 52 male students. Experimental group consisted of 26 and the control group of 26…

High Speed Gear Sized and Configured to Reduce Windage Loss

Science.gov (United States)

Kunz, Robert F. (Inventor); Medvitz, Richard B. (Inventor); Hill, Matthew John (Inventor)

2013-01-01

A gear and drive system utilizing the gear include teeth. Each of the teeth has a first side and a second side opposite the first side that extends from a body of the gear. For each tooth of the gear, a first extended portion is attached to the first side of the tooth to divert flow of fluid adjacent to the body of the gear to reduce windage losses that occur when the gear rotates. The gear may be utilized in drive systems that may have high rotational speeds, such as speeds where the tip velocities are greater than or equal to about 68 m/s. Some embodiments of the gear may also utilize teeth that also have second extended portions attached to the second sides of the teeth to divert flow of fluid adjacent to the body of the gear to reduce windage losses that occur when the gear rotates.

Student First Amendment Rights: Wisconsin School Board Association.

Science.gov (United States)

Baldwin, Gordon B.

Issues in students' First Amendment rights are discussed in this paper, which is directed toward school board members. The "Tinker v. Des Moines Independent Schools" (1969) decision is discussed, in which the United States Supreme Court struck down the discipline imposed on students who wore black armbands during school hours to protest…

VARIABLE MESH STIFFNESS OF SPUR GEAR TEETH USING ...

African Journals Online (AJOL)

gear engagement. A gear mesh kinematic simulation ... model is appropnate for VMS of a spur gear tooth. The assumptions for ... This process has been continued until one complete tooth meshing cycle is ..... Element Method. Using MATLAB,.

A Positive Model for Reducing and Preventing School Burnout in High School Students

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Aypay, Ayse

2017-01-01

This study aims to develop and test the validity of a model limited to attitude towards the future and subjective well-being for reducing and preventing the school burnout that high school students can experience. The study is designed as a relational screening model conducted over 389 high school students. The data in this study are analyzed…

Learning Science and English: How School Reform Advances Scientific Learning for Limited English Proficient Middle School Students

OpenAIRE

Minicucci, Catherine

1996-01-01

This article presents findings from the School Reform and Student Diversity Study, a 4-year project to locate and analyze schools offering exemplary science and mathematics programs to middle school students with limited proficiency in English. In contrast to the vast majority of schools, the four schools described in this article give these students access to stimulating science and mathematics curricula by instructing them either in the students' primary language or in English using shelter...

Evaluation of school counseling and guidance services based on views of high school students

OpenAIRE

Fulya Yüksel-Şahin

2008-01-01

This study evaluated school psychological counseling services based on high school students’ views. Participants were 235 students. “Student Personal Information Form” and “the School Guidance Services Scale” were used for data analysis. MANOVA and multiple regression procedures were used for data analysis. Results showed that students listed the guidance services from the most utilized to the least as follows: consultation, placement, follow-up, public and famil...

Vibration Based Sun Gear Damage Detection

Science.gov (United States)

Hood, Adrian; LaBerge, Kelsen; Lewicki, David; Pines, Darryll

2013-01-01

Seeded fault experiments were conducted on the planetary stage of an OH-58C helicopter transmission. Two vibration based methods are discussed that isolate the dynamics of the sun gear from that of the planet gears, bearings, input spiral bevel stage, and other components in and around the gearbox. Three damaged sun gears: two spalled and one cracked, serve as the focus of this current work. A non-sequential vibration separation algorithm was developed and the resulting signals analyzed. The second method uses only the time synchronously averaged data but takes advantage of the signal/source mapping required for vibration separation. Both algorithms were successful in identifying the spall damage. Sun gear damage was confirmed by the presence of sun mesh groups. The sun tooth crack condition was inconclusive.

Određivanje krutosti planetarnog prenosnika / Determination of gear mesh stiffness in planetary gearing

Directory of Open Access Journals (Sweden)

Vojislav Batinić

2008-04-01

Full Text Available Kontaktna krutost zubaca jedan je od glavnih generatora unutrašnjih dinamičkih sila u spregama zupčanika planetarnih prenosnika. Neophodan je pri opisivanju dinamičkog ponašanja planetarnih prenosnika, tj. pri postavljanju jednačina dinamičke ravnoteže. U radu je prikazan metodološki pristup analitičkom i eksperimentalnom određivanju krutosti posmatranog planetarnog prenosnika. / Gear mesh stiffness in planetary gearing is one of the main generators of internal dynamic forces. It is necessary in describing dynamic behavior of planetary trains, i.e. in defining their equations of dynamic balance. This paper presents a methodological approach to experimental and analytical calculation of stiffness in planetary gearing.

School-Based Drug Abuse Prevention Programs in High School Students

Science.gov (United States)

Sharma, Manoj; Branscum, Paul

2013-01-01

Drug abuse, or substance abuse, is a substantial public health problem in the United States, particularly among high school students. The purpose of this article was to review school-based programs implemented in high schools for substance abuse prevention and to suggest recommendations for future interventions. Included were English language…

IMPACT OF SCHOOL TUTORING IN THE PROJECTION OF HIGH SCHOOL ADULT STUDENTS, SEMIPRESENTIAL MODALITY

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Héctor José Peinado-Guevara

2011-01-01

Full Text Available The semipresential modality at high school level for adults, as the offered in the nightlife high school of the Universidad Autonoma de Sinaloa, that creates high expectations for Sinaloa´s society, to give the student an opportunity to continue its educational development in high school level and, lead him to continue with their vocational training. With this investigation, and given to their conditions, the objective it´s to know the competitive level at the beginning and during the development in the institution, also to identify the influence of the school tutoring in the development of adult students in high school. It was identified the income profile of students to the institution; was necessary to rescue the results of CENEVAL and EDAOM tests, practiced at the entry of students to the institution. Together this tools, was necessary to practice two questionnaires to evaluate the students perception about their teachers; and another one to identify the main problems they faced and the function of their school tutor in the institution. With the data obtained, were identified some deficiencies of semipresential system, especially in educational planning. Even though the students recognizes that the tutoring its fundamental to the incorporation of students to academic activities and that exists a high level of acceptance to the programs set by the institution.

Motivation and Achievement of Middle School Mathematics Students

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Herges, Rebecca M.; Duffield, Stacy; Martin, William; Wageman, Justin

2017-01-01

Mathematics achievement among K-12 students has been a long-standing concern in schools across the United States. A possible solution to this mathematics achievement problem is student motivation. A survey was administered to 65 mathematics students at a Midwestern middle school to determine their beliefs and attitudes related to motivation and…

Freedom of Speech and Adolescent Public School Students

Science.gov (United States)

Hussain, Murad

2008-01-01

Some legal cases on the freedom of speech in adolescent public school students are discussed. It is suggested that schools, social scientists and psychologists should build a social consensus on the extent to which the freedom of speech for abusive students can be allowed so as not to affect development of other students.

Academic profile of students who transferred to Zagreb School of Medicine from other medical schools in Croatia.

Science.gov (United States)

Dusek, Davorka; Dolovcak, Svjetlana; Kljaković-Gaspić, Marko

2004-02-01

To assess the academic performance of students who transferred to the Zagreb School of Medicine from other three medical schools in Croatia. Academic performance of medical students who moved from Rijeka, Osijek, or Split University Medical Schools to the Zagreb University School of Medicine at the second or third year was compared with academic performance of students enrolled at the Zagreb University School of Medicine. Using the Zagreb Medical School's registry, we made a list of 57 transfer students to Zagreb Medical School in the 1985-1994 period. Control group was formed of students enrolled at the Zagreb School of Medicine in the same period, whose names followed in alphabetical order after the names of transfer students. Students' performance was analyzed according to their grade average before transfer, grade average in the first year after transfer, total grade average after transfer, overall grade average, and duration of studies. We also analyzed the proportion of students in each group who did not pass the admission test at the Zagreb School of Medicine in the year before the enrollment in Zagreb, Osijek, Rijeka, and Split Medical Schools. Nineteen transfer students, transferred between 1985 and 1988, and their controls were excluded from the analysis because of incomplete data. Transfer students had significantly lower grade average before transfer (3.2-/+0.6 vs 3.5-/+0.7, p=0.03, Student t-test), lower grade average in the first year after transfer (3.2-/+0.6 vs 3.5-/+0.7, p=0.03), lower total grade average after transfer (3.6-/+0.5 vs 4.0-/+0.6, pZagreb School of Medicine in the year before the final enrollment than their controls (15/38 vs 4/38, p=0.009, chi-square test). Transfer students had poorer academic performance than students who passed the admission test and were enrolled at the Zagreb School of Medicine from the first year of studies.

Hybrid Gear Performance Under Loss-of-Lubrication Conditions

Science.gov (United States)

Laberge, Kelsen E.; Berkebile, Stephen P.; Handschuh, Robert F.; Roberts, Gary D.

2017-01-01

Hybrid composite gear technology is being investigated to increase power density in rotorcraft drive systems. These gears differ from conventional steel gears in that the structural web material is replaced with a lightweight carbon fiber composite. Past studies have focused on performance of this technology under normal operating conditions, however, for this technology to be viable it must also withstand adverse conditions. The study presented here evaluates the performance of hybrid gears under loss-of-lubrication conditions in NASA Glenn Research Centers Contact Fatigue Test Facility. Two experiments are presented using small-scale 3.5 inch (8.9 cm) pitch diameter hybrid gears and compared to a baseline steel gear pair. Results of these tests show that there are limitations to the use of a hexagonal interlock pattern between the steel and composite. There is also evidence that the presence of polymer in the gear during an oil out event has a potential to increase time to failure. Further studies are planned to expand on these initial findings.

A study on the experiences and causes of school violence amongst middle school students in korea

OpenAIRE

都, 基鳳; 全, 宰一; 野島, 一彦; Do, Giebong; Jun, Jaeil; Nojima, Kazuhiko

2005-01-01

The purpose of this study is to prepare effective measures to successfully cope with school violence by examining student experiences of school violence and its causes. The participants were middle school students in Korea. An investigation was made into how male and female students are different from each other in patterns of violence experienced or committed and the causes of that violence. The results are as follows: 1) Students who were victims of school violence suffered more than those ...

Mobile Technologies in Schools: The Student Voice

Science.gov (United States)

Hodge, Emma-Leigh; Robertson, Neville; Sargisson, Rebecca J.

2017-01-01

Intermediate and high school students spend a large amount of time using mobile devices (Lauricella, Cingel, Blackwell, Wartella, & Conway, 2014), and such devices are increasingly being integrated into our school system. We conducted a series of student-led focus groups, with this early adolescent cohort, in order to better understand their…

Prediction of potential failures in hydraulic gear pumps

Directory of Open Access Journals (Sweden)

E. Lisowski

2010-07-01

Full Text Available Hydraulic gear pumps are used in many machines and devices. In hydraulic systems of machines gear pumps are main component ofsupply unit or perform auxiliary function. Gear pumps opposite to vane pumps are less complicated. They consists of such components as:housing, gear wheels, bearings, shaft, seal for rotation motion which are not very sensitive for damage and that is why they are using veryoften. However, gear pumps are break down from time to time. Usually damage of pump cause shutting down of machines and devices.One of the way for identifying potential failures and foreseeing their effects is a quality method. On the basis of these methods apreventing action might be undertaken before failure appear. In this paper potential failures and damages of a gear pump were presented bythe usage of matrix FMEA analysis.

Economic method for helical gear flank surface characterisation

Science.gov (United States)

Koulin, G.; Reavie, T.; Frazer, R. C.; Shaw, B. A.

2018-03-01

Typically the quality of a gear pair is assessed based on simplified geometric tolerances which do not always correlate with functional performance. In order to identify and quantify functional performance based parameters, further development of the gear measurement approach is required. Methodology for interpolation of the full active helical gear flank surface, from sparse line measurements, is presented. The method seeks to identify the minimum number of line measurements required to sufficiently characterise an active gear flank. In the form ground gear example presented, a single helix and three profile line measurements was considered to be acceptable. The resulting surfaces can be used to simulate the meshing engagement of a gear pair and therefore provide insight into functional performance based parameters. Therefore the assessment of the quality can be based on the predicted performance in the context of an application.

Developing Cloud Chambers with High School Students

Science.gov (United States)

Ishizuka, Ryo; Tan, Nobuaki; Sato, Shoma; Zeze, Syoji

The result and outcome of the cloud chamber project, which aims to develop a cloud chamber useful for science education is reported in detail. A project includes both three high school students and a teacher as a part of Super Science High School (SSH) program in our school. We develop a dry-ice-free cloud chamber using salt and ice (or snow). Technical details of the chamber are described. We also argue how the project have affected student's cognition, motivation, academic skills and behavior. The research project has taken steps of professional researchers, i.e., in planning research, applying fund, writing a paper and giving a talk in conferences. From interviews with students, we have learnt that such style of scientific activity is very effective in promoting student's motivation for learning science.

Bevel gear driver and method having torque limit selection

Science.gov (United States)

Cook, Joseph S., Jr.

1994-08-01

This invention comprises a torque drive mechanism utilizing axially translatable, mutually engageable transmission members having mating crown gears, driven and driving members with a three-element drive train being biased together by resilient means or by a fluid actuator system, the apparatus being operable to transmit a precisely controlled degree of torque to a driven member. The apparatus is applicable for use in hand tools and as a replacement for impact torque drivers, torque wrenches, motorized screw drivers, or the like, wherein the applied torque must be precisely controlled or limited. The bevel torque drive includes a drive gear which is axially displaceable and rotatable within cylindrical driver housing, a rotatable intermediate gear, and an output gear. Key rotationally secures displaceable gear with respect to input shaft but permits axial movement therebetween. A thrust bearing is preferably connected to the lower end of shaft for support to reduce play and friction between shaft and a transmission joint disc during rotation of the gear train. Coaxially mounted coiled spring is footed against displaceable gear for biasing the displaceable gear toward and into engagement with the intermediate gear for driving intermediate gear and output gear. Torque control is achieved by the use of straight or spiral beveled gears which are of configurations adapted to withdraw from mutual engagement upon the torque exceeding a predetermined limit. The novel, advantageous features of the invention include the configuration of the mating, crown gear sets and the axially translatable, slidable drive gear. The mechanism is capable of transmitting a high degree of torque within a narrow, compact transmission housing. The compact size and narrow, elongated configuration of the housing is particularly applicable for use in hand tools and in multiple torque driver mechanisms in which it is necessary to drive multiple fasteners which are located in close proximity. Prior

Effect of tooth profile modification on wear in internal gears

Science.gov (United States)

Tunalioglu, M. S.; Tuc, B.

2018-05-01

Internal gears are often used in the automotive industry when two gears are required to rotate in the same direction. Tooth shapes, slippage speeds at the beginning and end of meshing are different according to the external gears. Manufacturing of internal gears is more difficult than external gears. Thus, it is necessary to determine the working conditions and wear behavior of internal gears carefully. The profile modification method in terms of strength and surface tension of the gear mechanism are performed in order to increase the load-carrying capability. In this study, profile modification method was performed in the internal gears to reduce the wear on the teeth. For this purpose, the wear of the internal gears was theoretically investigated by adapting the Archard wear equation to the internal gears. Closed circuit power circulation system was designed and manufactured to experimentally investigate the wear in internal gears. With this system, wear tests of gears made of St 50 material without profile modification and different profile modifications were made and the results were compared. Experimental study was performed in the same loading and cycle time conditions to validate the theoretical results and it was seen that the results are compatible. According to the experimental results, it is seen that in the internal gears, when profile modification done the wear is decreased in the teeth tip region.

Demographic Factors Affecting Internet Using Purposes of High School Students

Directory of Open Access Journals (Sweden)

Abdullah Faruk Kılıç

2017-01-01

Full Text Available This study aimed at determining the impact of demographic factors on the Internet usage purposes of high school students. The population of the study consisted of students between 9th and 12th grades from the Anatolian high schools, science high schools, social sciences high schools, sports high schools and fine arts high schools in Turkey. The sample was chosen through the stratified and cluster sampling procedure. The students were chosen randomly depending on the regions of their school attendance. The sample for this research numbered 3170 students. The research was conducted in the second term of the 2014-2015 academic year. The data were obtained through online forms and the bases of participation are honesty, sincerity, and volunteerism. The data collection tool is a questionnaire and a demographic information form prepared by the researchers. Chi-square Automatic Interaction Detector (CHAID analysis was conducted through SPSS in order to determine the demographic factors affecting the purposes of internet usage among high school students. The results of this research show that 9th grade students in Turkey mostly use the Internet to do homework while students from other grades mostly use the Internet for social networking. The male students use the Internet for playing video games more frequently in comparison with female students. Also, socioeconomic status affects the purpose of Internet usage. Hence it is suggested that teachers talking to male students might use the examples of computers and games and with female students they might relate the topics to social media.

Is the Four-Day School Week Detrimental to Student Success?

Science.gov (United States)

Tharp, Timothy W.; Matt, John; O'Reilly, Frances L.

2016-01-01

School districts across the United States are implementing four-day school weeks. This study looks at the relationship between student achievement in the four-day school week compared to student achievement in the five-day school week. This analysis focused on a common criteria referenced test given to all students over a period of seven years in…

Gear Fault Diagnosis Based on BP Neural Network

Science.gov (United States)

Huang, Yongsheng; Huang, Ruoshi

2018-03-01

Gear transmission is more complex, widely used in machinery fields, which form of fault has some nonlinear characteristics. This paper uses BP neural network to train the gear of four typical failure modes, and achieves satisfactory results. Tested by using test data, test results have an agreement with the actual results. The results show that the BP neural network can effectively solve the complex state of gear fault in the gear fault diagnosis.

High school dropouts: interactions between social context, self-perceptions, school engagement, and student dropout.

Science.gov (United States)

Fall, Anna-Mária; Roberts, Greg

2012-08-01

Research suggests that contextual, self-system, and school engagement variables influence dropping out from school. However, it is not clear how different types of contextual and self-system variables interact to affect students' engagement or contribute to decisions to dropout from high school. The self-system model of motivational development represents a promising theory for understanding this complex phenomenon. The self-system model acknowledges the interactive and iterative roles of social context, self-perceptions, school engagement, and academic achievement as antecedents to the decision to dropout of school. We analyzed data from the Education Longitudinal Study of 2002-2004 in the context of the self-system model, finding that perception of social context (teacher support and parent support) predicts students' self-perceptions (perception of control and identification with school), which in turn predict students' academic and behavioral engagement, and academic achievement. Further, students' academic and behavioral engagement and achievement in 10th grade were associated with decreased likelihood of dropping out of school in 12th grade. Published by Elsevier Ltd.

The School Absenteeism among High School Students: Contributing Factors

Science.gov (United States)

Balkis, Murat; Arslan, Gökmen; Duru, Erdinç

2016-01-01

The aim of this study was to examine the direct and indirect relationship between student school absenteeism, personal factors (academic self- perception, attitudes towards teacher and school, goal valuation and motivation/ self-regulation), family factors (parents' educational level and income), and academic achievement in structural equation…

Vibration and Operational Characteristics of a Composite-Steel (Hybrid) Gear

Science.gov (United States)

Handschuh, Robert F.; LaBerge, Kelsen E.; DeLuca, Samuel; Pelagalli, Ryan

2014-01-01

Hybrid gears have been tested consisting of metallic gear teeth and shafting connected by composite web. Both free vibration and dynamic operation tests were completed at the NASA Glenn Spur Gear Fatigue Test Facility, comparing these hybrid gears to their steel counterparts. The free vibration tests indicated that the natural frequency of the hybrid gear was approximately 800 Hz lower than the steel test gear. The dynamic vibration tests were conducted at five different rotational speeds and three levels of torque in a four square test configuration. The hybrid gears were tested both as fabricated (machined, composite layup, then composite cure) and after regrinding the gear teeth to the required aerospace tolerance. The dynamic vibration tests indicated that the level of vibration for either type of gearing was sensitive to the level of load and rotational speed.

Recruiting middle school students into nursing: An integrative review.

Science.gov (United States)

Williams, Cheryl

2017-10-27

Middle school students interested in nursing need clarification of the nursing role. Students choose nursing as a career because they want to help others, yet they are often unaware of the need to for arduous secondary education preparation to become a nurse. Middle school students, if not properly exposed to the career during their formative years, may choose another career or not have enough time for adequate nursing school preparation. This integrative review examined seven studies from years 2007 to 2016, which utilized various recruitment strategies to increase the awareness of nursing as a career in middle school and address the need for academic rigor. Implications of the review: there is a need for collaboration between nurses and school counselors to design more robust longitudinal studies of middle school interventions for students interested in nursing as a career. © 2017 Wiley Periodicals, Inc.

Collective school-type identity: predicting students' motivation beyond academic self-concept.

Science.gov (United States)

Knigge, Michel; Hannover, Bettina

2011-06-01

In Germany, according to their prior achievement students are tracked into different types of secondary school that provide profoundly different options for their future educational careers. In this paper we suggest that as a result, school tracks clearly differ in their social status or reputation. This should translate into different collective school-type identities for their students, irrespective of the students' personal academic self-concepts. We examine the extent to which collective school-type identity systematically varies as a function of the school track students are enrolled in, and the extent to which students' collective school-type identity makes a unique contribution beyond academic self-concept and school track in predicting scholastic motivation. In two cross-sectional studies a measure of collective school-type identity is established and applied to explain motivational differences between two school tracks in Berlin. In Study 1 (N = 39 students) the content of the collective school-type identity is explored by means of an open format questionnaire. Based on these findings a structured instrument (semantic differential) to measure collective school-type identity is developed. In Study 2 (N = 1278 students) the assumed structure with four subscales (Stereotype Achievement, Stereotype Motivation, Stereotype Social, and Compensation) is proved with confirmatory factor analysis. This measure is used to compare the collective school-type identity across school tracks and predict motivational outcomes. Results show large differences in collective school-type identity between students of different school tracks. Furthermore, these differences can explain motivational differences between school tracks. Collective school-type identity has incremental predictive power for scholastic motivation, over and above the effects of academic self-concept and school track.

46 CFR 108.641 - Instructions for changing steering gear.

Science.gov (United States)

2010-10-01

... 46 Shipping 4 2010-10-01 2010-10-01 false Instructions for changing steering gear. 108.641 Section... steering gear. Instructions stating, in order, the different steps to be taken for changing to emergency and secondary steering gear must be posted in the steering gear room and at each secondary steering...

Empowering Chicana/o and Latina/o High School Students: A Guide for School Counselors

Science.gov (United States)

Padilla, Alejandro; Hipolito-Delgado, Carlos P.

2016-01-01

A qualitative research study was conducted with 15 school counselors to identify the strategies they used to empower Chicana/o and Latina/o high school students. The findings of this study revealed that participants facilitated student empowerment by developing personal relationships with students, involving alumni, building sociocultural…

Ultrasonic test of highly stressed gear shafts

Energy Technology Data Exchange (ETDEWEB)

Schreiner, T [Siemens AG, Power Generation, KWU, Muelheim (Germany); Heinrich, W [Siemens AG, Power Generation, KWU, Berlin (Germany); Achtzehn, J [Siemens AG, Power Generation, ICVW, Erlangen (Germany); Hensley, H [Siemens Power Generation (Germany)

1999-12-31

In the power plant industry, gears are used for increasingly higher turbine capacities. Efficiency enhancements, particularly for the combined gas and steam turbine process, lead to an increase in stresses, even for high-performance gears. Consequently, the requirements for non-destructive material testing are on the increase as well. At Siemens KWU, high-performance gears are used so far only for gas turbines with lower rating (65 MW) to adapt the gas turbine speed (5413 rpm) to the generator speed (3000 rpm/ 50 Hz or 3600 rpm/60 Hz). The gear train consists of a forged and case-hardened wheel shaft and pinion shaft made of material 17 CrNiMo 6, where the wheel shaft can be either a solid or a hollow shaft. Dimensions are typically 2.3 m length and 1 m diameter. As a rule, pinion shafts are solid. The gear design, calling for an additional torsion shaft turning inside the hollow wheel shaft, can absorb more torsional load surges and is more tolerant of deviations during gear train alignment. This design requires two additional forgings (torsion shaft and hub) and an additional bearing 2 refs.

Ultrasonic test of highly stressed gear shafts

Energy Technology Data Exchange (ETDEWEB)

Schreiner, T. [Siemens AG, Power Generation, KWU, Muelheim (Germany); Heinrich, W. [Siemens AG, Power Generation, KWU, Berlin (Germany); Achtzehn, J. [Siemens AG, Power Generation, ICVW, Erlangen (Germany); Hensley, H. [Siemens Power Generation (Germany)

1998-12-31

In the power plant industry, gears are used for increasingly higher turbine capacities. Efficiency enhancements, particularly for the combined gas and steam turbine process, lead to an increase in stresses, even for high-performance gears. Consequently, the requirements for non-destructive material testing are on the increase as well. At Siemens KWU, high-performance gears are used so far only for gas turbines with lower rating (65 MW) to adapt the gas turbine speed (5413 rpm) to the generator speed (3000 rpm/ 50 Hz or 3600 rpm/60 Hz). The gear train consists of a forged and case-hardened wheel shaft and pinion shaft made of material 17 CrNiMo 6, where the wheel shaft can be either a solid or a hollow shaft. Dimensions are typically 2.3 m length and 1 m diameter. As a rule, pinion shafts are solid. The gear design, calling for an additional torsion shaft turning inside the hollow wheel shaft, can absorb more torsional load surges and is more tolerant of deviations during gear train alignment. This design requires two additional forgings (torsion shaft and hub) and an additional bearing 2 refs.

Long-Term Effects of School Size on Students' Outcomes

DEFF Research Database (Denmark)

Humlum, Maria Knoth; Smith, Nina

We estimate the effect of school size on students' long-term outcomes such as high school completion, being out of the labor market, and earnings at the age of 30. We use rich register data on the entire population of Danish children attending grade 9 in the period 1986-2004. This allows us...... school size and alternative measures of long-term success in the educational system and the labor market. The positive impact of school size seems mainly to be driven by boys, students from families with a low educational level and students attending schools in urban areas....

The association between higher body mass index and poor school performance in high school students.

Science.gov (United States)

Tonetti, L; Fabbri, M; Filardi, M; Martoni, M; Natale, V

2016-12-01

This study aimed to examine the association between body mass index (BMI) and school performance in high school students by controlling for relevant mediators such as sleep quality, sleep duration and socioeconomic status. Thirty-seven high school students (mean age: 18.16 ± 0.44 years) attending the same school type, i.e. 'liceo scientifico' (science-based high school), were enrolled. Students' self-reported weight and height were used to calculate BMI. Participants wore an actigraph to objectively assess the quality and duration of sleep. School performance was assessed through the actual grade obtained at the final school-leaving exam, in which higher grades indicate higher performance. BMI, get-up time, mean motor activity, wake after sleep onset and number of awakenings were negatively correlated with the grade, while sleep efficiency was positively correlated. When performing a multiple regression analysis, BMI proved the only significant (negative) predictor of grade. When controlling for sleep quality, sleep duration and socioeconomic status, a higher BMI is associated with a poorer school performance in high school students. © 2015 World Obesity Federation.

Vocational High School Students Entrepreneurship: The Success of Family or School Education..?

Directory of Open Access Journals (Sweden)

Arum Biruli Walidaini

2017-09-01

Full Text Available Purpose of this research is to • determine entrepreneur attitude of SMK students that have entrepreneurship, • determine role of eductaion in family also the role of eduction in school. Approch of that type used is qualitative. Research object was SMK students had been doing entrepreneur while Wadi. Informant in this research were students, the student's parent, teacher of entrepreneur and headmaster. Data collecting using deep interview technique, observation and documentation also attitude test. The research result shows that entreprenuership attitude of students include high category, education of family has important role to build entrepreneurship attitude in terms of involving children in their business, the role of school limited in supporting development of student's knowledge.

A Circularly Arranged Sextuple Triptycene Gear Molecule.

Science.gov (United States)

Ube, Hitoshi; Yamada, Ryo; Ishida, Jun-Ichi; Sato, Hiroyasu; Shiro, Motoo; Shionoya, Mitsuhiko

2017-11-22

Herein we report the synthesis of a circularly arranged sextuple triptycene gear molecule, hexakis(10-dodecyloxy-9-triptycyl)ethynylbenzene, via the trimerization of the corresponding triyne with a cobalt catalyst. The six triptycene gears are closely engaged with each other as confirmed by single crystal X-ray structure analysis, and their motion in solution was established by NMR spectroscopy. Notably, when one bulky RuCp* complex was attached to one triptycene gear, the whole movement of the six gears was highly restricted via their mechanical engagement. Development of such a multigear molecule would provide a structural basis for molecular motion transmission systems with a switching function.

Linear dynamic coupling in geared rotor systems

Science.gov (United States)

David, J. W.; Mitchell, L. D.

1986-01-01

The effects of high frequency oscillations caused by the gear mesh, on components of a geared system that can be modeled as rigid discs are analyzed using linear dynamic coupling terms. The coupled, nonlinear equations of motion for a disc attached to a rotating shaft are presented. The results of a trial problem analysis show that the inclusion of the linear dynamic coupling terms can produce significant changes in the predicted response of geared rotor systems, and that the produced sideband responses are greater than the unbalanced response. The method is useful in designing gear drives for heavy-lift helicopters, industrial speed reducers, naval propulsion systems, and heavy off-road equipment.

14 CFR 65.80 - Certificated aviation maintenance technician school students.

Science.gov (United States)

2010-01-01

... students has made satisfactory progress at the school and is prepared to take the oral and practical tests... technician school students. 65.80 Section 65.80 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION... § 65.80 Certificated aviation maintenance technician school students. Whenever an aviation maintenance...

The Influence of Conflict Resolution Programs on Student Conduct Violations in Middle Schools with a School Uniform Policy

Science.gov (United States)

Breitenbach, Edward C.

2010-01-01

School safety is a very important issue for school staff, parents, and students. When school safety is lacking, students suffer in emotional, academic, and social areas. One recent intervention middle schools are examining is the student uniform policy. In some cases, school uniforms have been shown to have a profound effect on school safety,…

Obesity and Aerobic Fitness among Urban Public School Students in Elementary, Middle, and High School.

Directory of Open Access Journals (Sweden)

B Ruth Clark

Full Text Available To assess the prevalence of cardiovascular disease risk among urban public school students through a collaborative school district and university partnership.Children and adolescents in grades K-12 from 24 urban public schools participated in measurements of height, weight, and other health metrics during the 2009-2010 school year. Body mass index (BMI percentiles and z-scores were computed for 4673 students. President's Challenge 1-mile endurance run was completed by 1075 students ages 9-19 years. Maximal oxygen consumption (⩒O2max was predicted using an age-, sex-, and BMI-specific formula to determine health-related fitness. Resting blood pressure (BP was assessed in 1467 students. Regression analyses were used to compare BMI z-scores, fitness, and age- and sex-specific BP percentiles across grade levels. Chi-square tests were used to explore the effect of sex and grade-level on health-related outcomes.Based on BMI, 19.8% were categorized as overweight and 24.4% were obese. Included in the obese category were 454 students (9.7% of sample classified with severe obesity. Using FITNESSGRAM criteria, 50.2% of students did not achieve the Healthy Fitness Zone (HFZ; the proportion of students in the Needs Improvement categories increased from elementary to middle school to high school. Male students demonstrated higher fitness than female students, with 61.4% of boys and only 35.4% of girls meeting HFZ standards. Elevated BP was observed among 24% of 1467 students assessed. Systolic and diastolic BP z-scores revealed low correlation with BMI z-scores.A community-university collaboration identified obesity, severe obesity, overweight, and low aerobic fitness to be common risk factors among urban public school students.

Vibration Propagation of Gear Dynamics in a Gear-Bearing-Housing System Using Mathematical Modeling and Finite Element Analysis

Science.gov (United States)

Parker, Robert G.; Guo, Yi; Eritenel, Tugan; Ericson, Tristan M.

2012-01-01

Vibration and noise caused by gear dynamics at the meshing teeth propagate through power transmission components to the surrounding environment. This study is devoted to developing computational tools to investigate the vibro-acoustic propagation of gear dynamics through a gearbox using different bearings. Detailed finite element/contact mechanics and boundary element models of the gear/bearing/housing system are established to compute the system vibration and noise propagation. Both vibration and acoustic models are validated by experiments including the vibration modal testing and sound field measurements. The effectiveness of each bearing type to disrupt vibration propagation is speed-dependent. Housing plays an important role in noise radiation .It, however, has limited effects on gear dynamics. Bearings are critical components in drivetrains. Accurate modeling of rolling element bearings is essential to assess vibration and noise of drivetrain systems. This study also seeks to fully describe the vibro-acoustic propagation of gear dynamics through a power-transmission system using rolling element and fluid film wave bearings. Fluid film wave bearings, which have higher damping than rolling element bearings, could offer an energy dissipation mechanism that reduces the gearbox noise. The effectiveness of each bearing type to disrupt vibration propagation in explored using multi-body computational models. These models include gears, shafts, rolling element and fluid film wave bearings, and the housing. Radiated noise is mapped from the gearbox surface to surrounding environment. The effectiveness of rolling element and fluid film wave bearings in breaking the vibro-acoustic propagation path from the gear to the housing is investigated.

High school students' experiences of bullying and victimization and the association with school health center use.

Science.gov (United States)

Lewis, Catherine; Deardorff, Julianna; Lahiff, Maureen; Soleimanpour, Samira; Sakashita, Kimi; Brindis, Claire D

2015-05-01

Bullying and victimization are ongoing concerns in schools. School health centers (SHCs) are well situated to support affected students because they provide crisis intervention, mental health care, and broader interventions to improve school climate. This study examined the association between urban adolescents' experiences of school-based bullying and victimization and their use of SHCs. Data was analyzed from 2063 high school students in 5 Northern California school districts using the 2009-2010 California Healthy Kids Survey. Chi-square tests and multivariate logistic regression were used to measure associations. Students who were bullied or victimized at school had significantly higher odds of using the SHCs compared with students who were not, and were also significantly more likely to report confidentiality concerns. The magnitude of associations was largest for Asian/Pacific Islander students, though this was likely due to greater statistical power. African American students reported victimization experiences at approximately the same rate as their peers, but were significantly less likely to indicate they experienced bullying. Findings suggest that SHCs may be an important place to address bullying and victimization at school, but confidentiality concerns are barriers that may be more common among bullied and victimized youth. © 2015, American School Health Association.

The influence of professional teachers on Padang vocational school students' achievement

Directory of Open Access Journals (Sweden)

Ramli Bakar

2018-01-01

Full Text Available This study determined: (1 the competency of professional teachers teaching in the classroom, (2 students' achievement in vocational schools in Padang, and (3 the influence of professional teachers on vocational school students' achievement in Padang. The population was 2,647 students in vocational schools. The sample, consisting of 160 students, was selected using a multistage, random sampling technique. Data were collected using questionnaires and documentation, and then analyzed and presented using the SPSS software. The results showed: (1 overall, the professional teachers of vocational schools in Padang had good qualifications in pedagogical competence, professional competence, social competence, and personal competence, (2 the learning process of vocational schools in Padang was going well and in general, student achievement was at a good level of performance, and (3 there was a significant influence of professional teachers on vocational school students' achievement in Padang. Keywords: professional teacher, student achievement, vocational school

School and class-level variations and patterns of physical activity: a multilevel analysis of Danish high school students.

Science.gov (United States)

Steenholt, Carina Bjørnskov; Pisinger, Veronica Sofie Clara; Danquah, Ida Høgstedt; Tolstrup, Janne Schurmann

2018-02-14

There is limited knowledge of physical activity (PA) patterns among high school students. High schools plays an important role as context for the students, but it is uncertain to what extent schools influence student participation in PA during leisure time. The purpose of this study is to describe patterns of PA and assess variations between schools and classes in PA, in a large cohort of Danish high school students. Self-reported cross-sectional data came from The Danish National Youth Study, comprising a total of 70,674 students attending 119 different schools and 3213 classes. Multilevel logistic regressions were applied to evaluate the association between socio-demographic variables and patterns of PA, and to assess the impact of schools and classes on PA measures. Students whose parents have achieved a lower level of education, older students and girls of perceived ethnic minority generally participated less in several forms of PA during leisure time. Substantial variations between schools were observed in terms of participation in PA at school during leisure time and in terms of use of active transportation to and from school. The school-level accounted for 9% (intra-class correlation coefficient (ICC) = 0.09 (95% CI: 0.06-0.11)) and 8% (ICC = 0.08 (95% CI: 0.07-0.11)) of the variation for participation in PA during leisure time and active transportation. Overall, students whose parents achieved a lower level of education, older students and girls of perceived ethnic minority represent vulnerable groups in relation to participation in several forms of PA during leisure time. The ICCs indicate that schools, in particular, have the potential to influence participation in PA at school during leisure time and active transportation to and from school. Thus, high schools should encourage and facilitate activities aimed at engaging students in PA during leisure time as well as encourage active transportation.

School-Related Variables in the Dimensions of Anger in High School Students in Turkey

Science.gov (United States)

Siyez, Digdem M.

2018-01-01

The study aimed to examine the effects of perceived social support from teachers, expectation of academic achievement, school control, and gender on anger dimensions in high school students in Izmir, Turkey. In total, 446 high school students (234 girls, 212 boys) participated in the study. Pearson's correlation and multiple regression analyses…

Harmfulness of smoking among high school students

Directory of Open Access Journals (Sweden)

Iwona Rotter

2013-03-01

Full Text Available Introduction: The aim of the study was to assess the level of awareness of smoking and non smoking students on harmful impact of nicotine and cigarette smoke on human body. Material and methods: The study was carried out in March 2011 in high schools in Szczecin. Own elaborated questionnaire was used. 288 students from high school, technical college and vocational school were tested. Results: The majority of responders (95,1% claimed that cigarette smoke is harmful both for passive and active smokers. They most often pinpoint the direct cause connected with smoking to pulmonary diseases (264 persons and cancers (240 persons. Almost 90% of students found negative impact of tobacco products on development of fetus of pregnant women. Overwhelming majority of respondents (83,2% feels anxious if it comes to stay in a room filled with smoke. Conclusions: The awareness of high school students on negative influence of smoking on human body is quite satisfactory, but there is still a need for more education in the range of diseases and symptoms connected with smoking.

A Generalized Dynamic Model of Geared System: Establishment and Application

Directory of Open Access Journals (Sweden)

Hui Liu

2011-12-01

Full Text Available In order to make the dynamic characteristic simulation of the ordinary and planetary gears drive more accurate and more efficient , a generalized dynamic model of geared system is established including internal and external mesh gears in this paper. It is used to build a mathematical model, which achieves the auto judgment of the gear mesh state. We do not need to concern about active or passive gears any more, and the complicated power flow analysis can be avoided. With the numerical integration computation, the axis orbits diagram and dynamic gear mesh force characteristic are acquired and the results show that the dynamic response of translational displacement is greater when contacting line direction change is considered, and with the quickly change of direction of contacting line, the amplitude of mesh force would be increased, which easily causes the damage to the gear tooth. Moreover, compared with ordinary gear, dynamic responses of planetary gear would be affected greater by the gear backlash. Simulation results show the effectiveness of the generalized dynamic model and the mathematical model.

Cyberbullying, school bullying, and psychological distress: a regional census of high school students.

Science.gov (United States)

Schneider, Shari Kessel; O'Donnell, Lydia; Stueve, Ann; Coulter, Robert W S

2012-01-01

Using data from a regional census of high school students, we have documented the prevalence of cyberbullying and school bullying victimization and their associations with psychological distress. In the fall of 2008, 20,406 ninth- through twelfth-grade students in MetroWest Massachusetts completed surveys assessing their bullying victimization and psychological distress, including depressive symptoms, self-injury, and suicidality. A total of 15.8% of students reported cyberbullying and 25.9% reported school bullying in the past 12 months. A majority (59.7%) of cyberbullying victims were also school bullying victims; 36.3% of school bullying victims were also cyberbullying victims. Victimization was higher among nonheterosexually identified youths. Victims report lower school performance and school attachment. Controlled analyses indicated that distress was highest among victims of both cyberbullying and school bullying (adjusted odds ratios [AORs] were from 4.38 for depressive symptoms to 5.35 for suicide attempts requiring medical treatment). Victims of either form of bullying alone also reported elevated levels of distress. Our findings confirm the need for prevention efforts that address both forms of bullying and their relation to school performance and mental health.

Gear cutting tools fundamentals of design and computation

CERN Document Server

Radzevich, Stephen P

2010-01-01

Presents the DG/K-based method of surface generation, a novel and practical mathematical method for designing gear cutting tools with optimal parameters. This book proposes a scientific classification for the various kinds of the gear machining meshes, discussing optimal designs of gear cutting tools.

46 CFR 58.25-20 - Piping for steering gear.

Science.gov (United States)

2010-10-01

... 46 Shipping 2 2010-10-01 2010-10-01 false Piping for steering gear. 58.25-20 Section 58.25-20... MACHINERY AND RELATED SYSTEMS Steering Gear § 58.25-20 Piping for steering gear. (a) Pressure piping must... the hydraulic system can be readily recharged from within the steering-gear compartment and must be...

Characteristics of headaches in Japanese elementary and junior high school students: A school-based questionnaire survey.

Science.gov (United States)

Goto, Masahide; Yokoyama, Koji; Nozaki, Yasuyuki; Itoh, Koichi; Kawamata, Ryou; Matsumoto, Shizuko; Yamagata, Takanori

2017-10-01

Few studies have investigated pediatric headaches in Japan. Thus, we examined the lifetime prevalence and characteristics of headaches among elementary and junior high school students in Japan. In this school-based study, children aged 6-15years completed a questionnaire based on the diagnostic criteria of the International Classification of Headache Disorders-3β to assess headache characteristics and related disability. Of the 3285 respondents, 1623 (49.4%) experienced headaches. Migraine and tension-type headaches (TTH) were reported by 3.5% and 5.4% of elementary school students, respectively, and by 5.0% and 11.2% of junior high school students. Primary headaches increased with age. Compared with TTH sufferers, the dominant triggers in migraine sufferers were hunger (odds ratio=4.7), sunny weather (3.3), and katakori (neck and shoulder pain) (2.5). Compared with TTH, migraine caused higher headache-related frustration (P=0.010) as well as difficulty concentrating (P=0.017). Migraine-related disability was greater among junior high school students (feeling fed up or irritated, P=0.028; difficulty concentrating, P=0.016). TTH-related disability was also greater among junior high school students (feeling fed up or irritated, P=0.035). Approximately half of the students who complained of headache-related disability were not receiving medical treatment. This is the first detailed study of headaches in Japanese children to include elementary school students. Nearly 50% of the school children reported headaches and the disruption of daily activities caused by migraine was higher among junior high students than elementary school students. Copyright © 2017 The Japanese Society of Child Neurology. Published by Elsevier B.V. All rights reserved.

Knowledge about HIV/AIDS among secondary school students

OpenAIRE

Pratibha Gupta; Fatima Anjum; Pankaj Bhardwaj; J P Srivastav; Zeashan Haider Zaidi

2013-01-01

Background: HIV/AIDS has emerged as the single most formidable challenge to public health. School children of today are exposed to the risk of HIV/AIDS. Aims: The study was conducted to determine the knowledge among secondary school students regarding HIV/AIDS and provide suggestions for HIV/AIDS education in schools. Materials and Methods: A cross-sectional study was conducted among students of tenth to twelfth standard in the intermediate schools of Lucknow, India, from July to October 2011...

High School Students' Views on Blended Learning

Science.gov (United States)

Yapici, Ibrahim Umit; Akbayin, Hasan

2012-01-01

In this study, it is aimed to determine the high school students' views on blended learning. The study was carried out in biology course for the lesson unit of "Classification of Living Things and Biodiversity" with 47 9[superscript th] grade students attending Nevzat Ayaz Anatolian High School in the second term of the academic year of…

Education and Health Matters: School Nurse Interventions, Student Outcomes, and School Variables

Science.gov (United States)

Wolfe, Linda C.

2013-01-01

This paper presents findings from a quantitative, correlational study that examined selected school nursing services, student academic outcomes, and school demographics. Ex post facto data from the 2011-2012 school year of Delaware public schools were used in the research. The selected variables were school nurse interventions provided to students…

Student Leadership Distribution: Effects of a Student-Led Leadership Program on School Climate and Community

Science.gov (United States)

Pedersen, Jeff; Yager, Stuart; Yager, Robert

2012-01-01

This study focuses on the understandings educators developed from two schools concerning how distributed leadership involving a select group of students affected the climate and community of their schools. Findings suggest that student-led leadership roles within the school community have an impact on creating a positive school-wide climate; a…

Sugar Sweetened Beverage Consumption among Primary School Students: Influence of the Schools' Vicinity.

Science.gov (United States)

Lebel, Alexandre; Morin, Pascale; Robitaille, Éric; Lalonde, Benoit; Florina Fratu, Ramona; Bisset, Sherri

2016-01-01

The purpose of the research was to explore the associations between the characteristics of schools' vicinity and the risk of sugar sweetened beverage (SSB) consumption in elementary students. Findings exposed an important variation in student's SSB consumption between schools. Schools with a lower socioeconomic status or in a densely built environment tend to have higher proportion of regular SSB drinkers. These characteristics of the school's vicinity partly explained the variation observed between them. We estimated that a student moving to a school with a higher proportion of SSB drinkers may increase his/her chances by 52% of becoming a daily consumer. Important changes in dietary preferences can occur when children are in contact with a new social environment. Findings also support the idea that dietary behaviors among children result from the complex interactions between biological, social, and environmental factors.

Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test

OpenAIRE

Jan Banach; Mirosława Cieślicka; Radosław Muszkieta; Walery Zukow; Robert Stępniak

2015-01-01

Banach Jan, Cieślicka Mirosława, Muszkieta Radosław, Zukow Walery, Stępniak Robert. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test. Journal of Education, Health and Sport. 2015;5(5):445-462. ISSN 2391-8306. DOI 10.5281/zenodo.18157 http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%285%29%3A445-462 https://pbn.nauka.gov.pl/work...

Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test

OpenAIRE

Banach, Jan; Cieślicka, Mirosława; Muszkieta, Radosław; Zukow, Walery; Stępniak, Robert

2015-01-01

Banach Jan, Cieślicka Mirosława, Muszkieta Radosław, Zukow Walery, Stępniak Robert. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test. Journal of Education, Health and Sport. 2015;5(5):445-462. ISSN 2391-8306. DOI 10.5281/zenodo.18157 http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%285%29%3A445-462 https://pbn.nauka.gov.pl/work...

Students' Perception of School Violence and Math Achievement in Middle Schools of Southern Italy

Science.gov (United States)

Caputo, Andrea

2013-01-01

This study aims at both investigating bullying episodes occurring at school across different grades (from 6 to 8) and evaluating whether educational achievement in math can be predicted on the ground of students' perception of school violence. The sample was composed of 11,064 students coming from middle schools of Southern Italy. Standardized…

Gear shift map design methodology for automotive transmissions

NARCIS (Netherlands)

Ngo, Viet Dac; Hofman, Theo; Steinbuch, Maarten; Serrarens, Alex

In this paper, a design methodology is developed to condtruct the gear shift map for the automotive transmissions used in conventional and hybrid electric vehicles. The methodology utilizes an optimal gear shift strategy to derive the optimal gear shift patterns over a wide range of driving

Surface micromachined counter-meshing gears discrimination device

Science.gov (United States)

Polosky, Marc A.; Garcia, Ernest J.; Allen, James J.

2000-12-12

A surface micromachined Counter-Meshing Gears (CMG) discrimination device which functions as a mechanically coded lock. Each of two CMG has a first portion of its perimeter devoted to continuous driving teeth that mesh with respective pinion gears. Each EMG also has a second portion of its perimeter devoted to regularly spaced discrimination gear teeth that extend outwardly on at least one of three levels of the CMG. The discrimination gear teeth are designed so as to pass each other without interference only if the correct sequence of partial rotations of the CMG occurs in response to a coded series of rotations from the pinion gears. A 24 bit code is normally input to unlock the device. Once unlocked, the device provides a path for an energy or information signal to pass through the device. The device is designed to immediately lock up if any portion of the 24 bit code is incorrect.

Building Place: Students' Negotiation of Spaces and Citizenship in Schools

Science.gov (United States)

Tupper, Jennifer A.; Carson, Terry; Johnson, Ingrid; Mangat, Jyoti

2008-01-01

This study explored how high school students negotiate school spaces beyond the classroom within a broader context of citizenship education and identity construction. Using visual hermeneutics, researchers worked over three years with students and staff in a large, diverse, urban, public high school. Through student-produced photographs of school…

Power loss analysis in altered tooth-sum spur gearing

Directory of Open Access Journals (Sweden)

Sachidananda H. K.

2018-01-01

Full Text Available The main cause of power loss or dissipation of heat in case of meshed gears is due to friction existing between gear tooth mesh and is a major concern in low rotational speed gears, whereas in case of high operating speed the power loss taking place due to compression of air-lubricant mixture (churning losses and windage losses due to aerodynamic trial of air lubricant mixture which controls the total efficiency needs to be considered. Therefore, in order to improve mechanical efficiency it is necessary for gear designer during gear tooth optimization to consider these energy losses. In this research paper the power loss analysis for a tooth-sum of 100 altered by ±4% operating between a specified center distance is considered. The results show that negative altered tooth-sum gearing performs better as compared to standard and positive altered tooth-sum gearing.

School-Based Screening to Identify At-Risk Students Not Already Known to School Professionals: The Columbia Suicide Screen

Science.gov (United States)

Wilcox, Holly C.; Schonfeld, Irvin Sam; Davies, Mark; Hicks, Roger C.; Turner, J. Blake; Shaffer, David

2009-01-01

Objectives. We sought to determine the degree of overlap between students identified through school-based suicide screening and those thought to be at risk by school administrative and clinical professionals. Methods. Students from 7 high schools in the New York metropolitan area completed the Columbia Suicide Screen; 489 of the 1729 students screened had positive results. The clinical status of 641 students (73% of those who had screened positive and 23% of those who had screened negative) was assessed with modules from the Diagnostic Interview Schedule for Children. School professionals nominated by their principal and unaware of students' screening and diagnostic status were asked to indicate whether they were concerned about the emotional well-being of each participating student. Results. Approximately 34% of students with significant mental health problems were identified only through screening, 13.0% were identified only by school professionals, 34.9% were identified both through screening and by school professionals, and 18.3% were identified neither through screening nor by school professionals. The corresponding percentages among students without mental health problems were 9.1%, 24.0%, 5.5%, and 61.3%. Conclusions. School-based screening can identify suicidal and emotionally troubled students not recognized by school professionals. PMID:19059865

Efficiency of fishing gears in the river Halda, Chittagong, Bangladesh

Directory of Open Access Journals (Sweden)

Mohammad Arshad-Ul-Alam

2015-12-01

Full Text Available To determine the catch efficiency of fishing gears, catch per unit effort (CPUEdata were collected for two years during January 2007 to December 2008 from the river Halda. Analyses were done to examine the variation of CPUE among gears, studied sections, months and years. The mean CPUE for pooled data of all gears was 2.247±0.265 kg.gear-1day-1 and 2.697±0.355 kg.gear-1day-1 for 2007 and 2008 respectively. Among eight gear categories, bag nets yielded the highest CPUE during 2007 (5.957±0.704 kg.gear-1day-1 and seine nets during 2008 (7.288±1.477 kg.gear-1day-1. Among 31 gear types, small meshed bag nets yielded the highest CPUE (18.065±6.660 and 15.69±4.479 kg.gear-1day-1 during 2007 and 2008 respectively. CPUE was highest during March-April and September-November periods. Analysis of variance showed significant difference among catch rates of different fishing gears. The CPUE differed significantly among different months for net fence, gill net, cast net and scoop net during 2007; and for seine net, net fence, bag net and cast net during 2008.

Teaching Ethics to High School Students

Science.gov (United States)

Pass, Susan; Willingham, Wendy

2009-01-01

Working with two teachers and thirty-four high school seniors, the authors developed procedures and assessments to teach ethics in an American high school civics class. This approach requires high school students to discover an agreement or convergence between Kantian ethics and virtue ethics. The authors also created an instrument to measure…

Student, Home, and School Socio-Demographic Factors: Links to School, Home, and Community Arts Participation

Science.gov (United States)

Mansour, Marianne; Martin, Andrew J.; Anderson, Michael; Gibson, Robyn; Liem, Gregory Arief D.; Sudmalis, David

2016-01-01

This study explored the role of student (e.g., age, language background, gender), home (e.g., parent/caregiver education), and school (e.g., school type, size) socio-demographic factors in students' school (e.g., in-school arts tuition, arts engagement), home (e.g., parent/caregiver-child arts interaction), and community (e.g., arts attendance,…

Hybrid Gear Preliminary Results-Application of Composites to Dynamic Mechanical Components

Science.gov (United States)

Handschuh, Robert F.; Roberts Gary D.; Sinnamon, R.; Stringer, David B.; Dykas, Brian D.; Kohlman, Lee W.

2012-01-01

Composite spur gears were fabricated and then tested at NASA Glenn Research Center. The composite material served as the web of the gear between the gear teeth and a metallic hub for mounting to the torque-applying shaft. The composite web was bonded only to the inner and outer hexagonal features that were machined from an initially all-metallic aerospace quality spur gear. The Hybrid Gear was tested against an all-steel gear and against a mating Hybrid Gear. As a result of the composite to metal fabrication process used, the concentricity of the gears were reduced from their initial high-precision value. Regardless of the concentricity error, the hybrid gears operated successfully for over 300 million cycles at 10000 rpm and 490 in.*lbs torque. Although the design was not optimized for weight, the composite gears were found to be 20% lighter than the all-steel gears. Free vibration modes and vibration/noise tests were also conduct to compare the vibration and damping characteristic of the Hybrid Gear to all-steel gears. The initial results indicate that this type of hybrid design may have a dramatic effect on drive system weight without sacrificing strength.

Impact of School Flu Vaccine Program on Student Absences

Science.gov (United States)

Plaspohl, Sara S.; Dixon, Betty T.; Streater, James A.; Hausauer, Elizabeth T.; Newman, Christopher P.; Vogel, Robert L.

2014-01-01

Literature provides evidence that school attendance correlates with academic performance and student success. Influenza is a contributing factor to school absences. Primary prevention for influenza includes immunization. School-located influenza vaccine (SLIV) programs provide greater access for students to be immunized. A retrospective review of…

School Nurse Perceptions of Student Anxiety.

Science.gov (United States)

Muggeo, Michela A; Ginsburg, Golda S

2018-01-01

Anxiety disorders are common in youth. Because somatic complaints are a hallmark feature of anxiety, these students frequently visit their school nurse, creating an ideal opportunity for nurses to identify and assist them. In an effort to better understand current practices, we surveyed a large sample ( N = 93) of school nurses. Results indicated that the majority of nurses perceived anxiety as the most prevalent mental health issue in their students. Moreover, the majority of nurses reported that they did not use any formal screening tool or intervention protocol and stated wanting to expand their training in anxiety intervention. These data suggest that school nurses identify anxiety as a top problem but do not receive adequate training to address it. Data from this survey may be used to plan how best to fill gaps in nurse training and practices that can enhance nurses' capacity to optimize outcomes for anxious students.

Peer and Teacher Preference, Student-Teacher Relationships, Student Ethnicity, and Peer Victimization in Elementary School

Science.gov (United States)

Wang, Feihong; Leary, Kevin A.; Taylor, Lorraine C.; Derosier, Melissa E.

2016-01-01

We examined the effects of peer preference and teacher preference for students, students' perceived relationship with their teacher and student ethnicity on peer victimization in late elementary school. Participants were students in the third through fifth grades in four public elementary schools in a southern state. Using hierarchical linear…

Surface contact fatigue failures in gears

CSIR Research Space (South Africa)

Fernandes, PJL

1997-06-01

Full Text Available Surface contact fatigue is the most common cause of gear failure. It results in damage to contacting surfaces which can significantly reduce the load-carrying capacity of components, and may ultimately lead to complete failure of a gear. Three types...

Demographic Factors Affecting Internet Using Purposes of High School Students

Science.gov (United States)

Kilic, Abdullah Faruk; Güzeller, Cem Oktay

2017-01-01

This study aimed at determining the impact of demographic factors on the Internet usage purposes of high school students. The population of the study consisted of students between 9th and 12th grades from the Anatolian high schools, science high schools, social sciences high schools, sports high schools and fine arts high schools in Turkey. The…

Incremental Theory of Intelligence Moderated the Relationship between Prior Achievement and School Engagement in Chinese High School Students.

Science.gov (United States)

Li, Ping; Zhou, Nan; Zhang, Yuchi; Xiong, Qing; Nie, Ruihong; Fang, Xiaoyi

2017-01-01

School engagement plays a prominent role in promoting academic accomplishments. In contrast to the relative wealth of research that examined the impact of students' school engagement on their academic achievement, considerably less research has investigated the effect of high school students' prior achievement on their school engagement. The present study examined the relationship between prior achievement and school engagement among Chinese high school students. Based on the Dweck's social-cognitive theory of motivation, we further examined the moderating effect of students' theories of intelligence (TOIs) on this relationship. A total of 4036 (2066 girls) students from five public high school enrolled in grades 10 reported their high school entrance exam achievement in Chinese, Math and English, school engagement, and TOIs. Results showed that (a) students' prior achievement predicted their behavioral, emotional, and cognitive engagement, respectively, and (b) the association between prior achievement and behavioral, emotional, and cognitive engagement is strong for students with an incremental theory but not for those with an entity theory in the emotional and cognitive engagement. These findings suggest that prior achievement and incremental theory were implicated in relation to adolescents' school engagement. Implications and future research directions were discussed.

Safe school task force: University-community partnership to promote student development and a safer school environment.

Science.gov (United States)

Adler, Corey; Chung-Do, Jane; Ongalibang, Ophelia

2008-01-01

The Asian/Pacific Islander Youth Violence Prevention Center (APIYVPC) focuses its youth violence prevention efforts on community mobilization by partnering with Kailua High School and other local community groups. This paper describes the development and activities of the Safe School Task Force (SSTF) and the lessons learned. In response to concerns of school, community members, and students, the SSTF was organized to promote student leadership in raising awareness about problems related to violence. Collaboration among the school, community, and the university places students in leadership roles to reduce school violence and enhances their self-efficacy to improve their school environment. To increase SSTF effectiveness, more attention must be paid to student recruitment, consistent community partnerships, and gaining teacher buy-in. This partnership may be useful in multicultural communities to provide students the opportunities to learn about violence prevention strategies, community mobilization, and leadership skills.

[Study on the school-related-factors of attempted suicide among rural middle school students].

Science.gov (United States)

Xing, Xiu-Ya; Tao, Fang-Biao; Hao, Jia-Hu; Xu, Shao-Jun; Su, Pu-Yu; Huang, Zhao-Hui

2009-01-01

This study was undertaken to examine possible relationship between attempted suicide and underachievement, bullying, low life satisfaction and low self-concept at school. An anonymous self-report survey assessing demographic characteristics and the major risk factors of teenage attempted suicide was completed by students from 16 middle schools in grades seven to twelve in 4 counties of Anhui province (age 10 to 21 years). An anonymous questionnaire was used to rate attempted suicide, bullying involvement and learning performance. Attempted suicide was defined as: experiencing specific suicide actions at least one time during the 12 months preceding the survey. Multidimensional Students' Life Satisfaction Scale and Children' s Self-concept Scale were used to evaluate satisfaction and self-conscience on and at respectively. In total, 10 894 respondents substantially completed the survey. Multiple logistic-regression analyses, controlling for socio-demographic variables, was used to analyze if underachievement, bullying, low school life satisfaction and low children' s self-conscience at school had been risk factors. 629 participants (5.8%) reported having made at least one attempted suicide within the last 12 months. Students being underachieved were significantly having more attempted suicide events than those excellent students (chi2 = 11.39, P = 0.023). Students being both bully-victims and practiced bully were significantly more than those being only practiced bully (28.7% vs. 15.8% , P bullying, lower school life satisfaction and low self conscience were risk factors for attempted suicide. Data from this study confirmed that school bullying and children' s self-conscience at school were significantly associated with attempted suicide among rural middle school students in Anhui province. It is of importance to improve the school' s environments to reduce the risk of attempted suicide among this group.

The Association of School Climate, Depression Literacy, and Mental Health Stigma Among High School Students.

Science.gov (United States)

Townsend, Lisa; Musci, Rashelle; Stuart, Elizabeth; Ruble, Anne; Beaudry, Mary B; Schweizer, Barbara; Owen, Megan; Goode, Carly; Johnson, Sarah L; Bradshaw, Catherine; Wilcox, Holly; Swartz, Karen

2017-08-01

Although school climate is linked with youth educational, socioemotional, behavioral, and health outcomes, there has been limited research on the association between school climate and mental health education efforts. We explored whether school climate was associated with students' depression literacy and mental health stigma beliefs. Data were combined from 2 studies: the Maryland Safe Supportive Schools Project and a randomized controlled trial of the Adolescent Depression Awareness Program. Five high schools participated in both studies, allowing examination of depression literacy and stigma measures from 500 9th and 10th graders. Multilevel models examined the relationship between school-level school climate characteristics and student-level depression literacy and mental health stigma scores. Overall school climate was positively associated with depression literacy (odds ratio [OR] = 2.78, p stigma (Est. = -3.822, p = .001). Subscales of engagement (OR = 5.30, p stigma (Est. = -6.610, p < .001), (Est. = -2.742, p < .001). Positive school climate was associated with greater odds of depression literacy and endorsement of fewer stigmatizing beliefs among students. Our findings raise awareness regarding aspects of the school environment that may facilitate or inhibit students' recognition of depression and subsequent treatment-seeking. © 2017, American School Health Association.

Gear Design Effects on the Performance of High Speed Helical Gear Trains as Used in Aerospace Drive Systems

Science.gov (United States)

Handschuh, R.; Kilmain, C.; Ehinger, R.; Sinusas, E.

2013-01-01

The performance of high-speed helical gear trains is of particular importance for tiltrotor aircraft drive systems. These drive systems are used to provide speed reduction / torque multiplication from the gas turbine output shaft and provide the necessary offset between these parallel shafts in the aircraft. Four different design configurations have been tested in the NASA Glenn Research Center, High Speed Helical Gear Train Test Facility. The design configurations included the current aircraft design, current design with isotropic superfinished gear surfaces, double helical design (inward and outward pumping), increased pitch (finer teeth), and an increased helix angle. All designs were tested at multiple input shaft speeds (up to 15,000 rpm) and applied power (up to 5,000 hp). Also two lubrication, system-related, variables were tested: oil inlet temperature (160 to 250 degF) and lubricating jet pressure (60 to 80 psig). Experimental data recorded from these tests included power loss of the helical system under study, the temperature increase of the lubricant from inlet to outlet of the drive system and fling off temperatures (radially and axially). Also, all gear systems were tested with and without shrouds around the gears. The empirical data resulting from this study will be useful to the design of future helical gear train systems anticipated for next generation rotorcraft drive systems.

Investigation of Sideband Index Response to Prototype Gear Tooth Damage

Science.gov (United States)

Dempsey, Paula J.

2013-01-01

The objective of this analysis was to evaluate the ability of gear condition indicators (CI) to detect contact fatigue damage on spiral bevel gear teeth. Tests were performed in the NASA Glenn Spiral Bevel Gear Fatigue Rig on eight prototype gear sets (pinion/gear). Damage was initiated and progressed on the gear and pinion teeth. Vibration data was measured during damage progression at varying torque values while varying damage modes to the gear teeth were observed and documented with inspection photos. Sideband indexes (SI) and root mean square (RMS) CIs were calculated from the time synchronous averaged vibration data. Results found that both CIs respond differently to varying torque levels, damage levels and damage modes

Students' Satisfaction with Life and Its Relation to School Burnout

Directory of Open Access Journals (Sweden)

Vali Mehdinezhad

2015-12-01

Full Text Available The purpose of this study was to investigate the relationship between school burnout and satisfaction with life for students in grade of 7th to 9th. A quantitative method used in this study. 351 subjects were selected using stratified sampling. The two questionnaires employed here were The Satisfaction with Life Scale with five items of the Diener et al. (1985 and School-Burnout Inventory with nine items and three component - exhaustion at schoolwork (EXH, cynicism toward the meaning of school (CYN, and sense of inadequacy at School (INAD - measures of school burnout of the Salmela-Aro et al. (2009. The findings of this study showed that the high school students described their satisfaction with life in relatively satisfactory and they have described their level of school burnout lower than average. The results also showed their school burnout in component of exhaustion at schoolwork was above average and in Components of cynicism toward the meaning of school, and sense of inadequacy at School were lower than average. The results showed that in overall there was no significant correlation between satisfaction with life and school burnout. However, there was relatively low positive correlation between students' satisfaction with life and exhaustion at schoolwork, relatively low negative correlation between students' satisfaction with life and cynicism toward the meaning of school, and no any significance correlation between students' satisfaction with life and sense of inadequacy at school. The results of stepwise regression showed that sub-dimensions of high school burnout scale together explained a total of 14.5 % of the variance in the satisfaction with life for the students in this study.

School Nurses: An Investment in Student Achievement

Science.gov (United States)

Maughan, Erin D.

2018-01-01

School nurses help students with the prevention and management of chronic physical and mental health issues, but not all schools have a full-time registered nurse on their staff. The author argues that investing in school nursing has benefits that extend beyond the school and into the community.

Examination of cyberbullying experiences among Turkish students from different school types.

Science.gov (United States)

Topçu, Cigdem; Erdur-Baker, Ozgür; Capa-Aydin, Yeşim

2008-12-01

The purpose of this study was to examine the nature of cyberbullying experiences among public and private school students in Turkey. One hundred eighty-three participants between the ages of 14 and 15 were recruited for the study. Participants were asked to respond to questionnaires measuring demographic information, usage frequency of Internet-mediated communication tools (IMCT), and cyberbullying experience (as a victim and as a bully). Participants who reported cyberbullying victimization were also asked how they felt and whether they sought help after such experiences. Results indicated that public school students were more likely than private school students to report being cyberbullies and cybervictims despite that private school students were more likely than public school students to report more frequent usage of IMCT. The findings of the logistic regression analyses indicated that usage frequency of IMCT was a significant predictor of cyberbullying/victimization for public school students but not for private school students. While victims from private school revealed that they did not mind the cyberbullying experience because they thought it was a joke, victims from public school reported that they felt angry when they experienced cyberbullying. Both public and private schools indicated that friends were their first choice for help.

Two dimensional model of a permanent magnet spur gear

DEFF Research Database (Denmark)

Jørgensen, Frank Thorleif; Andersen, Torben Ole; Rasmussen, Peter Omand

2005-01-01

This paper presents calculation and measurement results of a high-performance permanent-magnetic gear. The analyzed permanent-magnetic gear has a gear ratio of 5.5 and is able to deliver 27 N/spl middot/m. The analysis has shown that special attention needs to be paid to the system where the gear...... is to be installed because of a low natural torsion spring constant. The analyzed gear was also constructed in practice in order to validate the analysis and predict the efficiency. The measured torque from the magnetic gear was only 16 N/spl middot/m reduced by the large end-effects. A systematic analysis...... of the loss components in the magnetic gear is also performed in order to figure out why the efficiency for the actual construction was only 81%. A large magnetic loss component originated in the bearings, where an unplanned extra bearing was necessary due to mechanical problems. Without the losses...

Finite Element Residual Stress Analysis of Planetary Gear Tooth

Directory of Open Access Journals (Sweden)

Jungang Wang

2013-01-01

Full Text Available A method to simulate residual stress field of planetary gear is proposed. In this method, the finite element model of planetary gear is established and divided to tooth zone and profile zone, whose different temperature field is set. The gear's residual stress simulation is realized by the thermal compression stress generated by the temperature difference. Based on the simulation, the finite element model of planetary gear train is established, the dynamic meshing process is simulated, and influence of residual stress on equivalent stress of addendum, pitch circle, and dedendum of internal and external meshing planetary gear tooth profile is analyzed, according to non-linear contact theory, thermodynamic theory, and finite element theory. The results show that the equivalent stresses of planetary gear at both meshing and nonmeshing surface are significantly and differently reduced by residual stress. The study benefits fatigue cracking analysis and dynamic optimization design of planetary gear train.

A study on the automated design system for gear

Energy Technology Data Exchange (ETDEWEB)

Cho, H. Y.; Nam, G. J.; Oh, B. K. [Chungbuk National Univ., Cheongju (Korea, Republic of)

2001-07-01

A computer aided design system for spur, helical, bevel and worm gears by using AutoCAD system and its AutoLISP computer language was newly developed in this study. Two methods are available for a designer to draw a gear. The first method needs the gear design parameters such as pressure, module, number of tooth, shaft angle, velocity, materials, etc. When the gear design parameters are inputted, a gear is drawn in AutoCAD system and maximum allowable power and shaft diameter are calculated additionally. The second method calculates all dimensions and gear design parameters to draw a gear when the information such as transmission, reduction ratio, rpm, materials and pressure are inputted. The system includes four programs. Each program is composed of a data input module, a database module, a strength calculation module, a drawing module, a text module and a drawing edit module. In conclusion, the CAD system would be widely used in companies to find the geometric data and manufacturing course.

A study on the automated design system for gear

International Nuclear Information System (INIS)

Cho, H. Y.; Nam, G. J.; Oh, B. K.

2001-01-01

A computer aided design system for spur, helical, bevel and worm gears by using AutoCAD system and its AutoLISP computer language was newly developed in this study. Two methods are available for a designer to draw a gear. The first method needs the gear design parameters such as pressure, module, number of tooth, shaft angle, velocity, materials, etc. When the gear design parameters are inputted, a gear is drawn in AutoCAD system and maximum allowable power and shaft diameter are calculated additionally. The second method calculates all dimensions and gear design parameters to draw a gear when the information such as transmission, reduction ratio, rpm, materials and pressure are inputted. The system includes four programs. Each program is composed of a data input module, a database module, a strength calculation module, a drawing module, a text module and a drawing edit module. In conclusion, the CAD system would be widely used in companies to find the geometric data and manufacturing course

Modeling of automotive driveline system for reducing gear rattles

Science.gov (United States)

Shangguan, Wen-Bin; Liu, Xue-Lai; Yin, Yuming; Rakheja, Subhash

2018-03-01

A nonlinear torsional model for a driveline system with 4 degrees of freedom is proposed for studying gear rattle if a car is at idle. The time-varying meshing stiffness of geared teeth, gear backlash, and the damping from oil film are included in the model. The dynamic responses of the driveline system, such as clutch angular displacement, meshing force and relative displacement between geared teeth, are calculated using the presented model. The influences of stiffness and damping of a clutch on gear rattle of geared teeth in a generic transmission are investigated. Based on the calculation and analysis results, a design guideline to select clutch's stiffness and damping is developed to reduce gear rattle for a car at idle. Taking a generic driveline system of a passenger car as an example, the developed method is experimentally validated by comparing the baseline clutch and revised clutch, in terms of the measured noise inside engine compartment and cab and vibrations at transmission housing.

Examining the Relationship Between School Climate and Peer Victimization Among Students in Military-Connected Public Schools.

Science.gov (United States)

De Pedro, Kris Tunac; Astor, Ron Avi; Gilreath, Tamika; Benbenishty, Rami; Berkowitz, Ruth

2016-01-01

In the Iraq and Afghanistan war context, studies have found that military-connected youth- youth with parents and/or siblings serving in the military-have higher rates of school victimization than their nonmilitary-connected peers. A positive school climate-where students perceive high levels of school connectedness, caring relationships and high expectations from adults, and meaningful participation-is associated with lower rates of victimization in secondary public schools. Based on a survey of 7th, 9th, and 11th grade students (N =14,493) enrolled in 6 military-connected school districts (districts that have a significant proportion of military-connected students), this study explores victimization rates and the role of school climate, deployment, and school transitions in the victimization of military-connected students and their civilian peers. The findings indicate that deployment and school transitions were significant predictors of physical violence and nonphysical victimization. In addition, multiple school climate factors were significantly associated with physical violence and nonphysical victimization. The authors conclude with a discussion of future directions for research on school climate, victimization, and military-connected youth.

[Survey regarding mental health conditions of high school students and attitudes of students and their teachers toward students' mental health issues].

Science.gov (United States)

Hattori, Isao; Fujii, Chiyo; Fukuzawa, Ayako

2013-01-01

We administered a self-reporting questionnaire survey regarding the mental health conditions of high school students and attitudes of students and their teachers toward students' mental health issues. In addition, we discussed the requirements for high school students' mental health support system. The subjects were 3,312 students and 208 teachers in four Shizuoka prefectural public high schools in 2009. University Personality Inventory (UPI) is usually conducted to assess university students' mental state and is a questionnaire that high school students can answer easily. Therefore, we adopted UPI for this survey. UPI was composed of 56 unhealthy and 4 healthy condition items. High school students completed the UPI and determined the sum of unhealthy condition items; a higher score indicated a poorer mental health status. The average UPI score of all students (n = 3,312) was 12.7 points, and that of females (n = 1,217)was 15.2 points, which was significantly higher than the 11.3 points of males (n = 2,095). Those with scores > or = 30 points (7.5%), which was more than half of the maximum score, were designated as the High Score (HS) group and considered to have poor mental health. Those with scores of > or = 40 (1.4%) seemed to have very poor mental health, and there was concern that they may be suffering from psychosis. Our observations indicated that HS students were likely to avoid seeking help regarding mental health issues, which was especially true for male HS students. The majority of students chose their friends and parents as advisers, but HS students were significantly more likely to choose advisers who were engaged in jobs related to medical work. Students in both the HS and non-HS groups who did not wish to consult anyone else about their mental conditions wanted to be approached by those around them. High school teachers hesitated to intervene with mentally disturbed students and attempted to resolve problems within the school. Thus, it appears

78 FR 68817 - Proposed Information Collection; Comment Request; Northeast Region Gear Identification

Science.gov (United States)

2013-11-15

... gear type being used to help prevent gear conflicts. II. Method of Collection No information is... certain types of fishing gear mark the gear with specified information. The gear marking requirements... for marking several strings of a given gear type, or may use multiple different gear types that...

Predicting Middle School Students' Use of Web 2.0 Technologies out of School Using Home and School Technological Variables

Science.gov (United States)

Hughes, Joan E.; Read, Michelle F.; Jones, Sara; Mahometa, Michael

2015-01-01

This study used multiple regression to identify predictors of middle school students' Web 2.0 activities out of school, a construct composed of 15 technology activities. Three middle schools participated, where sixth- and seventh-grade students completed a questionnaire. Independent predictor variables included three demographic and five computer…

The theory and practice of worm gear drives

CERN Document Server

Dudás, Ilés

2005-01-01

Worm gears are special gears that resemble screws, and can be used to drive other gears. Worm gears, enable two non-touching shafts in a machine to mesh (join) together. This publication, unique in that it combines both theoretical and practical design aspects, including the latest results of research and development, provides detailed treatment of the theory and production of worm drives, as well as the overarching subject of production geometry of helicoidal surfaces.Included are mathematical models for a number of practical applications; a description of dressing equipment r

The Effect of High School Shootings on Schools and Student Performance

OpenAIRE

Louis-Philippe Beland; Dongwoo Kim

2015-01-01

We analyze how fatal shootings in high schools affect schools and students using data from shooting databases, school report cards, and the Common Core of Data. We examine schools’ test scores, enrollment, and number of teachers, as well as graduation, attendance, and suspension rates at schools that experienced a shooting, employing a difference-in-differences strategy that uses other high schools in the same district as the comparison group. Our findings suggest that homicidal shootings s...

College Student for a Day: A Transition Program for High School Students with Disabilities

Science.gov (United States)

Novakovic, Alexandra; Ross, Denise E.

2015-01-01

High school students with disabilities can benefit from early exposure to campus-based accommodations and supports as they transition to college. College Student for a Day (CSFAD) is an on-campus activity-based program that introduces high school students with disabilities to supports and accommodations on a college campus. This Practice Brief…

Partners in Physics with Colorado School of Mines' Society of Physics Students

Science.gov (United States)

Moore, Shirley; Stilwell, Matthew; Boerner, Zach

2011-04-01

The Colorado School of Mines (CSM) Society of Physics Students (SPS) revitalized in 2008 and has since blown up with outreach activity, incorporating all age levels into our programs. In Spring 2010, CSM SPS launched a new program called Partners in Physics. Students from Golden High School came to CSM where they had a college-level lesson on standing waves and their applications. These students then joined volunteers from CSM in teaching local elementary school students about standing waves beginning with a science show. The CSM and high school students then helped the children to build make-and-take demonstrations incorporating waves. This year, rockets are the theme for Partners in Physics and we began with demonstrations with local middle school students. In Spring 2011, CSM SPS will be teaching elementary school students about projectile motion and model rockets along with these middle school students. Colorado School of Mines Department of Physics

Does the amount of school choice matter for student engagement?

Science.gov (United States)

Vaughn, Michael G.; Witko, Christopher

2013-01-01

School choice may increase student engagement by enabling students to attend schools that more closely match their needs and preferences. But this effect on engagement may depend on the characteristics of the choices available. Therefore, we consider how the amount of educational choice of different types in a local educational marketplace affects student engagement using a large, national population of 8th grade students. We find that more choice of regular public schools in the elementary and middle school years is associated with a lower likelihood that students will be severely disengaged in eighth grade, and more choices of public schools of choice has a similar effect but only in urban areas. In contrast, more private sector choice does not have such a general beneficial effect. PMID:23682202

Do students from public schools fare better in medical school than their colleagues from private schools? If so, what can we learn from this?

Science.gov (United States)

Costa-Santos, Cristina; Vieira-Marques, Pedro; Costa-Pereira, Altamiro; Ferreira, Maria Amélia; Freitas, Alberto

2018-03-27

Internal grade inflation is a documented practice in secondary schools (mostly in private schools) that jeopardises fairness with regard to access to medical school. However, it is frequently assumed that the higher internal grades are in fact justifiable, as they correspond to better preparation of students in private schools in areas that national exams do not cover but nevertheless are important. Consequently, it is expected that students from private schools will succeed better in medical school than their colleagues, or at least not perform worse. We aimed to study whether students from private schools do fare better in medical school than their colleagues from public schools, even after adjusting for internal grade inflation. We analysed all students that entered into a medical course from 2007 to 2014. A linear regression was performed using mean grades for the 1st-year curse units (CU) of the medical school curriculum as a dependent variable and student gender, the nature of students' secondary school (public/private), and whether their secondary school highly inflated grades as independent variables. A logistic regression was also performed, modelling whether or not students failed at least one CU exam during the 1st year of medical school as a function of the aforementioned independent variables. Of the 1709 students analysed, 55% came from public secondary schools. Private (vs. public) secondary school (β = - 0.459, p schools highly inflated grades (β = - 0.246, p = 0.003) were independent factors that significantly influenced grades during the first year of medical school. Having attended a private secondary school also significantly increased the odds of a student having failed at least one CU exam during the 1st year of medical school (OR = 1.33), even after adjusting for whether or not the secondary school used highly inflated grades. It is important to further discuss what we can learn from the fact that students from public