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1

ESB Heavy Lift Requirements.  

National Technical Information Service (NTIS)

Operation Iraqi Freedom (OIF) has produced many examples that illustrate the abysmal heavy lift situation within USMC Engineer Support Battalions (ESBs). For example, in one instance during OIF I, Bridge Company C, 8th ESB crossed the Line of Departure in...

C. Darnell

2006-01-01

2

NASA Heavy Lift Rotorcraft Systems Investigation  

Microsoft Academic Search

The NASA Heavy Lift Rotorcraft Systems Investigation examined in depth several rotorcraft configurations for large civil transport, designed to meet the technology goals of the NASA Vehicle Systems Program. The investigation identified the Large Civil Tiltrotor as the configuration with the best potential to meet the technology goals. The design presented was economically competitive, with the potential for substantial impact

Wayne Johnson; Gloria K. Yamauchi; Michael E. Watts

3

Augmented heavy lift assist devices for enhanced safety performance  

Microsoft Academic Search

Heavy lift assist devices are an important part of manufacturing facilities that involve large, heavy or bulky material. Many devices are available that provide lift but not motive force augmentation. In these devices, the physical strength of the operator is used to move and position the work piece. Due to large work piece inertial characteristics, inertial contributions from the lift

Greg R. Luecke; Kok-Leong Tan; Gary Simpson

1998-01-01

4

Occupational Lifting Tasks and Retinal Detachment in Non-Myopics and Myopics: Extended Analysis of a Case-Control Study  

PubMed Central

Objectives Lifting heavy weights involves the Valsalva manoeuvre, which leads to intraocular pressure spikes. We used data from a case-control study to further investigate the hypothesis that occupational lifting is a risk factor for retinal detachment. Methods The study population included 48 cases (patients operated for retinal detachment) and 84 controls (outpatients attending an eye clinic). The odds ratios (OR) of idiopathic retinal detachment were estimated with a logistic regression model (adjusted for age, sex and body mass index). Three indexes were used to examine exposure to lifting; 1) maximum load lifted, 2) average weekly lifting, 3) lifelong cumulative lifting. Results For all indexes, the most exposed subjects showed an increased risk of retinal detachment compared with the unexposed (index 1: OR 3.57, 95% confidence interval [CI] 1.21-10.48; index 2: OR 3.24, 95% CI 1.32-7.97; index 3: OR 2.23, 95% CI 1.27-8.74) and dose-response relationships were apparent. Conclusion These results reinforce the hypothesis that heavy occupational lifting may be a relevant risk factor for retinal detachment.

Mattioli, Stefano; Curti, Stefania; De Fazio, Rocco; Mt Cooke, Robin; Zanardi, Francesca; Bonfiglioli, Roberta; Violante, Francesco S

2012-01-01

5

B-52 Heavy-lift Airborne Launch Aircraft  

NASA Website

B-52 Heavy-lift Airborne Launch Aircraft Dryden's highly-modified NB-52B is used primarily as an air launch platform, although it has also been used as a research aircraft for a variety of projects. The oldest B-52 flying, it has been integral to ...

6

Heavy lift launch vehicles for 1995 and beyond  

Microsoft Academic Search

A Heavy Lift Launch Vehicle (HLLV) designed to deliver 300,000 lb to a 540 n mi circular polar orbit may be required to meet national needs for 1995 and beyond. The vehicle described herein can accommodate payload envelopes up to 50 ft diameter by 200 ft in length. Design requirements include reusability for the more expensive components such as avionics

R. Toelle

1985-01-01

7

Fracture analysis of forks of a heavy duty lift truck  

Microsoft Academic Search

The fracture of the two forks of a heavy duty lift truck in operation at a harbour is described and discussed. The failure analysis included: mechanical tests for characterisation of the material, including tensile and Charpy tests; the study of a previous repair by welding carried out in one of the forks and the identification of consequential weld defects; the

M. V Figueiredo; F. M. F Oliveira; J. P. M Gonçalves; P. M. S. T de Castro; A. A Fernandes

2001-01-01

8

Augmented heavy lift assist devices for enhanced safety performance  

NASA Astrophysics Data System (ADS)

Heavy lift assist devices are an important part of manufacturing facilities that involve large, heavy or bulky material. Many devices are available that provide lift but not motive force augmentation. In these devices, the physical strength of the operator is used to move and position the work piece. Due to large work piece inertial characteristics, inertial contributions from the lift device itself, and misuse of the assist manipulator, injuries may still occur. In this research, an approach is presented that provides reduced-authority actuation to the motive joints of the lift device that allows for augmentation of the human motion forces, provides a means of correcting injurious ergonomic interactions, and allows for high rate energy dissipation for payload trajectory control and emergency situations. The approach is to provide low torque input controlled by operator hand motions. These hand motions move the payload under a centralized trajectory generation scheme that uses modulated braking commands to impose motion constraints, such as object avoidance, resonance attenuation and ergonomic trajectory enhancement. The system is implemented in an virtual reality robot simulator that allows for the investigation of dynamic characteristics prior to the prototype stage.

Luecke, Greg R.; Tan, Kok-Leong; Simpson, Gary

1998-12-01

9

Aerospace plane applications for heavy lift missions to the moon and Mars  

NASA Astrophysics Data System (ADS)

The possibility of achieving heavy-lift and interplanetary transportation by aerospace plane-like launch vehicles and Mars transfer vehicles is discussed. It is concluded that reusable airbreathing heavy-lift launch vehicles based on aerospace plane technologies may eventually be feasible for boosting all elements of Mars expeditions into earth orbit for journeys embarked upon about every two years. The same vehicles could be used for heavy lift commerce between the earth and moon and for space tourism.

Froning, H. D., Jr.; Leingang, J. L.; Carreiro, L. R.

1992-12-01

10

Vehicle Concepts and Technology Requirements for Buoyant Heavy-Lift Systems.  

National Technical Information Service (NTIS)

Several buoyant-vehicle (airship) concepts proposed for short hauls of heavy payloads are described. Numerous studies identified operating cost and payload capacity advantages relative to existing or proposed heavy-lift helicopters for such vehicles. Appl...

M. D. Ardema

1981-01-01

11

Aerial Very Heavy Lift Concepts for the 1990 Army. Volume III. Academic and Industrial Presentations.  

National Technical Information Service (NTIS)

The document covers the technical feasibility of developing a very heavy aerial lift vehicle to be operational by 1990. The mission spectrum for such a vehicle was assumed similar to the proposed QMR for the heavy-lift helicopter except that the payload r...

1969-01-01

12

Occupational health impacts: offshore crane lifts in life cycle assessment  

Microsoft Academic Search

Background, Aim, and Scope  The identification and assessment of environmental tradeoffs is a strongpoint of life cycle assessment (LCA). A tradeoff made\\u000a in many product systems is the exchange of potential for occupational accidents with the additional use of energy and materials.\\u000a Net benefits of safety measures with respect to human health are best illustrated if the consequences avoided and health

Johan Pettersen; Edgar G. Hertwich

2008-01-01

13

Rare-earth permanent magnet lifting system for heavy loads  

Microsoft Academic Search

A permanent magnet lifting system has been designed by use of rare-earth neodymium-iron-boron (NdFeB)permanent magnets together with an efficient soft magnetic material framework to provide an optimal lifting system. A hydraulic pick'n release mechanism is used for picking and releasing loads, and by the same mechanism the lifting force can also be selected. The system described here is intended to

N. A. Shirazee; A. Basak

1995-01-01

14

Lifting an unexpectedly heavy object: the effects on low-back loading and balance loss  

Microsoft Academic Search

Objective. This study evaluates the effects of lifting an unexpectedly heavy object on low-back loading and loss of balance.Background. It is often suggested that lifting an unexpectedly heavy object may be a major risk factor for low-back pain. This may lead to an increase in muscle activation, stretch of ligaments and posterior disc, and loss of balance.Methods. Nine healthy male

J. C. E. van der Burg; J. H. van Dieën; H. M. Toussaint

2000-01-01

15

Minor heavy metal: A review on occupational and environmental intoxication  

PubMed Central

Heavy metal is widely used in industries and presents as a problematic environmental pollution. Some heavy metals, especially lead and mercury, are well described for their occupational and environmental intoxication whereas the other minor heavy metals are less concerned. In this article, the author will present the details of occupational and environmental minor heavy metal intoxication. This review focuses mainly on aluminum, tin, copper, manganese, chromium, cadmium and nickel.

Wiwanitkit, Viroj

2008-01-01

16

Paraplegia due to Spinal Cord Infarction After Lifting Heavy Objects  

PubMed Central

Spinal cord infarction is uncommon and usually presents with sudden onset of motor and sensory disturbances. We report a case of a 64-year-old women without previous medical history, who presented with acute onset of paraplegia after lifting. However, radiologic examinations did not show any abnormal lesion in the spinal cord. And, cerebrospinal fluid studies also showed no remarkable findings. This case illustrates the cause of spontaneous paraplegia after lifting injury and we consider the presumptive cause of paraplegia as spinal cord infarction.

Lee, Sung-Ho; Choi, Seok-Geun; Lim, Young-Jin

2008-01-01

17

Power Plant Study for Shaft-Driven Heavy-Lift Rotary-Wing Aircraft.  

National Technical Information Service (NTIS)

Studies were conducted on various multiengine gas turbine propulsion systems for a shaft-driven, heavy-lift helicopter. The helicopter was based on a design gross weight of 75,000 to 85,000 pounds, having a 40,000-pound payload. Growth versions of existin...

H. Moellmann W. O'Connor

1967-01-01

18

Study of Heavy Truck Occupant Crash Protection: Accident Data Analyses.  

National Technical Information Service (NTIS)

Results from previously published studies and analyses of selected automated accident data files were combined to determine what percentage of heavy truck accidents involve significant injury to truck occupants, and which subsets are amenable to applicati...

T. A. Ranney

1983-01-01

19

Definition and assessment of specific occupational demands concerning lifting, pushing, and pulling based on a systematic literature search  

PubMed Central

Aims: (1) To find a universal strategy for the identification of specific demands of a job or task, focusing on occupations in which there may be an increased risk for health complaints owing to these specific demands. (2) To select reliable and valid tests concerning lifting, pushing, and pulling, which consider the relation between occupational work demands and the assessment of the maximally acceptable load on an individual level. Methods: Literature search was performed using Medline (1988 to May 2001), Embase (1966 to May 2001), and NIOSHTIC (1971–98). Results: No universal strategy was found for the definition of specific occupational demands. Therefore a "three step strategy" was formulated for defining specific occupational demands in a job or a task in order to prevent health complaints on an individual level. Many tests were found in the literature concerning lifting, but only a few concerning pushing and pulling. None of the tests concerning pushing, pulling, or lifting considered the relation between work demands and the assessment of the maximally acceptable load on an individual level. Furthermore, none of the tests met the criteria of reliability and prognostic value for musculoskeletal complaints completely. Only for the prognostic value of relative strength capacity tests concerning pushing pulling and lifting, did there appear to be limited proof for the development of musculoskeletal complaints. Conclusions: In general, for the prevention of work related health complaints, it can be suggested that more attention should be paid to: (1) the definition of specific occupational demands; (2) the assessment of specific occupational demands; and (3) the quality of tests for specific occupational demands.

Bos, J; Kuijer, P; Frings-Dresen, M

2002-01-01

20

A test manager's perspective of a test concept for a heavy lift vehicle  

NASA Astrophysics Data System (ADS)

The developmment of a test concept is a significant part of the advanced planning activities accomplished for the Initial Operational Test and Evaluation (IOT&E) of new systems. A test concept is generally viewed as a description, including rationale, of the test structure, evaluation methodology and management approach required to plan and conduct the IOT&E of a program such as a new heavy lift launch vehicle system. The test concept as presented in this paper is made up of an operations area, a test area, an evaluation area, and a management area. The description presented here is written from the perspective of one test manager, and represents his views of a possible framework of a test concept using examples for a potential IOT&E of a heavy lift launch vehicle.

Pargeon, John I., Jr.

1990-09-01

21

Heavy-lift launch vehicle options for future space exploration initiatives  

NASA Astrophysics Data System (ADS)

A review of present heavy-lift launch vehicles (HLLV) capable of placing heavy payloads in earth orbit is presented and the basis for an emerging consensus that an HLLV will be required in the near future is discussed. Some of the factors for the policies governing the roles and requirements for these vehicles in the future, such as cost, technology development, and lead time to first use are addressed. Potential Space Station Freedom application is discussed as well as application to the proposed initiatives for human exploration of Mars and the moon.

Branscome, Darrell R.; Harris, Ronald J.

1990-10-01

22

Discriminability of load heaviness: implications for the psychophysical approach to manual lifting.  

PubMed

The main objective of this study was to investigate human ability to discriminate between different levels of load heaviness in manual lifting. Twelve male college students participated in the laboratory experiment. Twenty-eight sequences of five boxes that weighed from 5 to 64 lbs (2.27-29.1 kg) were used. The subjects were asked to arrange boxes in each sequence in order of the perceived (increasing or decreasing) heaviness, i.e., from lightest to the heaviest box, or from heaviest to the lightest box. The subjects were also asked to assign linguistic descriptors of perceived load heaviness to each box in the sequence, and to indicate the confidence levels regarding correctness of the assigned box order and assignment of linguistic values. The independent variables included magnitude of weight and load differential between the successive weights in a sequence. The number of sequential ordering errors, assignment of linguistic variables, and estimated confidence levels were highly dependent on the load differential and weight range. It was concluded that in order to assure reliable results of the psychophysical approach to determining the values of maximum acceptable weight of lift, the adjustment process for male subjects should require using small weights of at least 4 lbs (1.8 kg) to be added or removed from the lifted box. The results of this study also suggest that the error rate in load discriminability can be controlled below the 10% level, if the relative difference in weight between successive boxes lifted is at least 12%. Given the above findings, it is suggested that usefulness of some of the recommendations for setting safe limits for manual lifting tasks, which were reached based on the psychophysical approach and broadly reported in the past, may need to be carefully re-examined. Finally, this study showed that the Weber fraction for load heaviness over the range of lifted weights from 8.6 to 29.1 kg is between 0.03 and 0.04. PMID:1633786

Karwowski, W; Shumate, C; Yates, J W; Pongpatana, N

23

Independent digit control: failure to partition perceived heaviness of weights lifted by digits of the human hand.  

PubMed Central

1. A weight-matching task was used to investigate the ability to estimate heaviness when weight lifting was isolated to the extrinsic flexor muscles (or portions thereof) that act on the digits of the hand. 2. Subjects matched a reference weight (200 g) lifted by a digit on the right with a variable weight lifted by the left thumb; a concurrent weight was simultaneously lifted by a digit on the right (reference) side. The reference and concurrent weights were lifted either by the same muscle (digital portions of flexor digitorum profundus), or anatomically separate but functionally related muscles (flexor digitorum profundus and flexor pollicis longus). Anaesthesia of the radial nerve and/or posturing of the hand was used to eliminate any small forces generated by co-contraction of the extensor muscles of the digits. 3. When the concurrent weight was equal to or greater than the reference weight, the perceived heaviness of the reference weight increased significantly from control trials (in which no concurrent weight was lifted). Although perceived heaviness of the reference weight increased progressively as the concurrent weight increased, reproducibility (expressed as the coefficient of variation) did not deteriorate when a weight was lifted concurrently. These findings were qualitatively similar when the reference and concurrent weights were lifted by two digital portions of flexor digitorum profundus or when the weights were lifted by flexion of the thumb and index finger. Also, anaesthesia of the digits which lifted the reference and concurrent weights did not alter the changes in perceived heaviness. 4. Perceived heaviness of the reference weight lifted by flexor digitorum profundus did not change when subjects lifted the concurrent weight with a remote muscle group (ankle dorsiflexors). 5. This study shows that signals of heaviness are systematically overestimated whenever more than one portion of the extrinsic muscles which flex the different digits are simultaneously active. Given that estimates of heaviness are biased by the central motor command, one explanation is that when the total motor drive increases, the central nervous system is unable to partition precisely the destination of motor commands to functionally related 'muscles'.

Kilbreath, S L; Gandevia, S C

1991-01-01

24

A Longitudinal Study of Low-Back Pain as Associated with Occupational Weight Lifting Factors  

Microsoft Academic Search

A review of the biomechanics of weight lifting as it relates to low-back stresses is presented first. This serves as the basis for the development of a Lifting Strength Rating (LSR) methodology. Then a study is reported wherein the LSR methodology is used to evaluate 103 jobs having various amounts of required two-handed load lifting. The 411 people populating these

DON B. CHAFFIN; KYUNG S. PARK

1973-01-01

25

Drinking habits and prevalence of heavy drinking among occupational healthcare patients  

PubMed Central

Objective To estimate the proportion of heavy drinkers among occupational healthcare patients and evaluate their characteristics. Design Patients visiting their doctor in six occupational health clinics were asked to complete a questionnaire containing the Alcohol Use Disorders Identification Test (AUDIT) and other questions concerning health. Setting Occupational health services. Subjects A total of 757 patients participated in the study. Main outcome measure Heavy drinking was defined as having a score of 10 or more (men) or 8 or more (women) in the AUDIT questionnaire. Results Of the men 114 (29%) and of the women 48 (13%) were heavy drinkers. Only smoking differentiated both male and female heavy drinkers from moderate drinkers among the clinically relevant characteristics. Conclusion There are a considerable number of heavy drinkers among occupational healthcare patients. Heavy drinkers do not have any particularly specific characteristics except for the drinking that distinguish them from other patients. Thus, screening is necessary to identify heavy drinkers in occupational healthcare settings.

Kaarne, Tiina; Aalto, Mauri; Kuokkanen, Martti; Seppa, Kaija

2009-01-01

26

ESC-B: The Cryogenic Upper Stage for Europe's Heavy Lift Launcher Ariane 5ECB  

NASA Astrophysics Data System (ADS)

-A. Juhls, Astrium GmbH -M. Lepelletier, Snecma Moteurs -JM. Bahu, CNES -C. Poincheval, CNES. In the year 1998 the European ministerial council decided to initiate the Ariane 5 Plus programme in order to upgrade the European heavy lift launcher Ariane 5. The market was changing more rapidly than predicted showing steadily growing satellite mass and the demand for flexible missions while strong competitors were intensifying their preparations to enter the commercial business. The answer was to improve the Ariane 5 launcher by modifying the cryogenic first (or lower ?) stage and the solid boosters and by introducing two cryogenic upper stages in two steps: In order to cope with the short term need of a significant growth of GTO lift capacity up to 10 t the first denoted ESC-A shall enter commercial service in 2002. Four years later a more powerful second version shall take over enabling a GTO performance of 12 t and providing versatile mission capability. The paper will focus on this new cryogenic upper stage denoted ESC-B giving first a general description of main characteristics and constituents. The article will highlight different challenging aspects of the ESC-B development: Ambitious economical conditions regarding both limited development budgets and the strong need to reduce production cost require improved working methods and an adjustment of the conventional development logic, in particular regarding new verification methods. Furthermore Europe is now facing the complex combination of versatile mission capability together with a powerful cryogenic upper stage. The paper will present the approach to define reasonable mission scenarios in order to cover customer demands while avoiding too stringent system requirements. Along with VINCI, Europe's first expander cycle type engine featuring an extendable nozzle dedicated subsystems will be described which allow 4 re-ignitions and 6 hours of ballistic flight. The paper concludes with the summary of the development planning aiming at a first launch of ESC-B in 2006.

Juhls, A.

2002-01-01

27

Transportation of floating structures by using newly built heavy lifting semi vessel HYSY278  

NASA Astrophysics Data System (ADS)

Transportation of floating structures for long distance has always been associated with the use of heavy semi transport vessel. The requirements of this type of vessel are always special, and its availability is limited. To prepare for the future development of the South China Sea deepwater projects, COOEC has recently built a heavy lift transport vessel — Hai Yang Shi You 278 (HYSY278). This semi-submersible vessel has displacement capacity of 50k DWT, and a breath of 42 m. Understanding the vessel's applicability and preparing its use for future deepwater projects are becoming imminent need. This paper reviews the critical issues associated with the floating structure transportation and performs detailed analysis of two designed floating structures during transportation. The newly built COOEC transportation vessel HYSY278 will be used to dry transport the floating structures from COOEC fabrication yard in Qingdao to the oil field in the South China Sea. The entire process will start with load-out/float-off the floating structures from the construction sites, offload the platform from the vessel if needed, dry transport floating structures through a long distance, and finally offload the platform. Both hydrodynamic and structural analyses are performed to evaluate transport vessel and floating structures. Critical issues associated with the transportation and offloading of platform from the vessel will be studied in detail. Detailed study is performed to evaluate the response of the system during this phase and additional work needed to make the vessel feasible for use of this purpose. The results demonstrate that with proper modifications, HYSY278 can effectively be used for transporting structures with proper arrangement and well-prepared operation. The procedure and details are presented on the basis of study results. Special attentions associated with future use will also be discussed based on the results from analysis.

Sun, Wei-ying; Zhang, Da-gang; Fan, Zhi-xia

2013-06-01

28

Heavy Lift Helicopter - Cargo Handling ATC Program. Volume I. Detail Design Structural and Weights Analysis, and Static and Dynamic Load Analysis.  

National Technical Information Service (NTIS)

This report presents formal documentation of efforts and results of the cargo handling system segment of the Heavy Lift Helicopter (HLH) Advanced Technology Component (ATC) development program. The purpose of the HLH/ATC program was to minimize technical ...

B. Solak J. Shefrin L. Simpson R. Campbell W. Nutley

1976-01-01

29

Fuzzy modelling of relations between physical weight and perceived heaviness: the effect of size-weight illusion in industrial lifting tasks  

Microsoft Academic Search

In four experiments with 224 subjects the relationships between physical weight, subjective heaviness, and size of load (container) were investigated. The results were described with the help of fuzzy sets and processed further in a way, that the so called size-weight illusion—known from basic psychophysical research— could be determined for ranges of load relevant for industrial lifting tasks. From a

HOLGER LUCZAK; SHUANGSHENG GE

1989-01-01

30

Heavy metal toxicity: lessons from a case of simultaneous occupational exposure to manganese and mercury.  

PubMed

Heavy metal toxicity represents a heterogenous group of rare diseases that are associated with a wide variety of neurological syndromes. Manganese and mercury are two heavy metals that are neurotoxic and have been associated with occupational exposures. Manganese toxicity is an established cause of Parkinsonism however the causal relationship with occupational exposures such as welding remains disputed. Chronic mercury toxicity is associated with the classic triad of tremor, gingivitis and erethism as well as visual, sensory and cerebellar disturbances. There are no well-defined therapeutic protocols for toxicity to mercury or many other heavy metals. We present a case of a 33 year-old male oil rig painter who regularly worked adjacent to active welding and did not take protective measures. His wife noticed that he was initially confused and then developed clumsiness, slurred speech, social withdrawal and hallucinations over the following year. On examination he had bilateral cerebellar signs, cognitive impairment and a chaotic intention tremor consistent with mercury toxicity. There were also symmetrical parkinsonian features including bradykinesia and rigidity in both upper and lower limbs with a cock-like walk typical of manganese toxicity. Blood mercury and manganese levels were both significantly raised. This case highlights the importance of considering a broad heavy metal screen in the context of neurological disease associated with industrial occupations. It also leads us to revisit the controversial association of welding and manganese exposure and then review sources of heavy metal exposures and the current recommendations for treatment. PMID:24108897

Shribman, Sam; Davis, Angharad; Vella, Norbert; Giovannoni, Gavin

2013-11-01

31

A logistics and potential hazard study of propellant systems for a Saturn 5 derived heavy lift (three-stage core) launch vehicle  

NASA Astrophysics Data System (ADS)

The Bush Administration has directed NASA to prepare for a return to the Moon and on to Mars - the Space Exploration Initiative. To meet this directive, powerful rocket boosters will be required in order to lift payloads that may reach the half-million pound range into low earth orbit. In this report an analysis is presented on logistics and potential hazards of the propellant systems envisioned for future Saturn 5 derived heavy lift launch vehicles. In discussing propellant logistics, particular attention has been given to possible problems associated with procurement, transportation, and storage of RP-1, HL2, and LOX, the heavy lift launch vehicle propellants. Current LOX producing facilities will need to be expanded and propellant storage and some support facilities will require relocation if current Launch Pads 39A and/or 39B are to be used for future heavy noise-abatement measures. Included in the report is a discussion of suggested additional studies, primarily economic and environmental, which should be undertaken in support of the goals of the Space Exploration Initiative.

Whitney, E. Dow

1992-09-01

32

Increased hair cadmium in newborns of women occupationally exposed to heavy metals  

SciTech Connect

Newborn and maternal hair samples were obtained from subjects occupationally exposed to heavy metals and from matched controls. The geometric means of levels of cadmium and lead in hair from exposed mothers and cadmium in hair from transplacentally exposed newborns were twice as high as levels present in samples from controls. There was a positive correlation between levels of cadmium in maternal and newborn's hair, but no such correlation for lead. Despite statistically significant evidence of increased exposure to cadmium, no adverse health effects were documented in the small group of exposed newborns included in this study. Problems associated with exogenous contamination of hair by heavy metals and potential advantages of hair sampling for measuring fetal exposures to heavy metals are discussed.

Huel, G.; Everson, R.B.; Menger, I.

1984-10-01

33

Parametric Analysis and Preliminary Design of a Shaft-Driven Rotor System for a Heavy-Lift Helicopter.  

National Technical Information Service (NTIS)

A parametric analysis and a preliminary design study were conducted to determine the optimum characteristics of a shaft-driven rotor which would result in the lightest gross weight helicopter capable of lifting military loads in the 12- to 20-ton range. T...

H. D. Goldstein H. M. Childers J. M. Brye V. Bilezikjian W. J. Conway

1966-01-01

34

Implications of the Revised NIOSH Lifting Guide of 1991: A Field Study.  

National Technical Information Service (NTIS)

In 1981, the National Institute of Occupational Safety and Health (NIOSH) published the Work Practices Guide for Manual Lifting with the goal of reducing injury from manual lifting in the workplace. The 1981 Guide established the 1981 Lifting Equation to ...

N. L. Brokaw

1992-01-01

35

The relationship between maximal lifting capacity and maximum acceptable lift in strength-based soldiering tasks.  

PubMed

Psychophysical assessments, such as the maximum acceptable lift, have been used to establish worker capability and set safe load limits for manual handling tasks in occupational settings. However, in military settings, in which task demand is set and capable workers must be selected, subjective measurements are inadequate, and maximal capacity testing must be used to assess lifting capability. The aim of this study was to establish and compare the relationship between maximal lifting capacity and a self-determined tolerable lifting limit, maximum acceptable lift, across a range of military-relevant lifting tasks. Seventy male soldiers (age 23.7 ± 6.1 years) from the Australian Army performed 7 strength-based lifting tasks to determine their maximum lifting capacity and maximum acceptable lift. Comparisons were performed to identify maximum acceptable lift relative to maximum lifting capacity for each individual task. Linear regression was used to identify the relationship across all tasks when the data were pooled. Strong correlations existed between all 7 lifting tasks (rrange = 0.87-0.96, p < 0.05). No differences were found in maximum acceptable lift relative to maximum lifting capacity across all tasks (p = 0.46). When data were pooled, maximum acceptable lift was equal to 84 ± 8% of the maximum lifting capacity. This study is the first to illustrate the strong and consistent relationship between maximum lifting capacity and maximum acceptable lift for multiple single lifting tasks. The relationship developed between these indices may be used to help assess self-selected manual handling capability through occupationally relevant maximal performance tests. PMID:22643137

Savage, Robert J; Best, Stuart A; Carstairs, Greg L; Ham, Daniel J

2012-07-01

36

Biomechanical Basis for Manual Lifting Guidelines.  

National Technical Information Service (NTIS)

The biomechanics of the lower back was reviewed as a basis for establishing a load handling limit. Topics included occupational biomechanics of load lifting, biomechanical basis for back injury, compressive strength of lumbar spinal column, biomechanical ...

A. Garg

1989-01-01

37

Lift Off!  

NSDL National Science Digital Library

This activity (on page 2 of the PDF) is a full inquiry investigation into the engineering challenges of sending scientific sensors into space. Groups of learners will develop sensors to be deployed on model rockets to measure or indicate selected properties encountered during each rocketâs flight, test launching and modifying as necessary to gather data. Relates to linked video, DragonflyTV: Lift Off!

Twin Cities Public Television, Inc.

2005-01-01

38

Electrokinetic lift  

NASA Astrophysics Data System (ADS)

Electrolyte flow relative to a charged surface induces a bulk electric field (the ``streaming potential'' phenomena). This field, and the flow perturbation it animates, generate both electrical and hydrodynamic ``electro-viscous'' forces whose magnitude has been a matter of ongoing controversy. Recently we have revisited this problem, predicting O(2?) scaling (as opposed to earlier prediction of 4? and 6?), ?1 being the dimensionless Debye width. These electro-viscous forces can explain the anomalous repulsion of polystyrene microspheres from an adjacent wall in the presence of an imposed shear flow, observed by Prieve and co-workers. Owing to the symmetry properties of the linear Stokes equations, such repulsion is inadmissible in the absence of inertial effects. This particle--wall interaction is analyzed using our revised scheme. The undisturbed flow consists of three components: the `driving' shear mechanism and the `induced' particle translation and rotation. We consider a small dimensionless particle--wall gap ?. At leading-order, both the lift and additional drag are contributed by the inner gap region. The lift force is O(2?&-3circ;) while the additional drag is O(2?&-2circ;). The streaming-potential mechanism underlying these forces arises from the `induced' rather than the driving component.

Schnitzer, Ory; Yariv, Ehud; Frankel, Itzchak

2011-11-01

39

Face-Lift  

MedlinePLUS

... lift technique A face-lift (rhytidectomy) is a cosmetic surgical procedure to improve the look of your ... can be done in combination with some other cosmetic procedures, such as a brow lift or eyelid ...

40

Horizontal lifting— Physiological and psychological responses  

Microsoft Academic Search

Five healthy brewer's draymen with 4-10 years of occupational experience were studied in the laboratory during horizontal lifting work, which simulated an order filling task at a brewery. The subjects performed lifting from left to right and were instructed to choose the weight of a case which they preferred for normal 8-hour piece-rate work. The subjects chose about half as

A.-S. LJUNGBERG; F. GAMBERALE; Å. KILBOM

1982-01-01

41

The open brow lift.  

PubMed

The open brow lift procedure is discussed in terms of relevant surgical anatomy, preoperative evaluation, and detailed surgical technique for pretrichial coronal forehead lift with hair-bearing temporal lift, direct incisional brow lift, and coronal brow lift. Complications are discussed, and information is presented on patient evaluation and expectations, with a discussion of what patients can expect before and after brow lift surgery. PMID:23186761

Walrath, Joseph D; McCord, Clinton D

2012-08-26

42

Scaling of lifting forces in relation to object size in whole body lifting.  

PubMed

Subjects prepare for a whole body lifting movement by adjusting their posture and scaling their lifting forces to the expected object weight. The expectancy is based on visual and haptic size cues. This study aimed to find out whether lifting force overshoots related to object size cues disappear or persist over a number of repeated lifts. In addition, the influence of the degree of alternation between load sizes, and the influence of knowledge of actual object weights prior to the lifts, were investigated with regard to their effect on force overshoots. Four experiments were performed using a large and a small box, each of 8.4 kg weight, and varying degrees of alternation between boxes. In two of the experiments, subjects were informed about the weight of the objects, while in the other two experiments they were not informed about the weight of the objects. When boxes were lifted 15 times before switching to the other box, rapid diminishing of force scaling errors was observed. However, when boxes were alternated each lift or after three lifts, persisting force scaling overshoots were found in lifting the large box compared to the small one. When participants were given information regarding the actual object weight, force overshoots in the first pair of large and small box lifts were not different from overshoots in experiments where subjects were not informed about the weight of the objects. This shows that, for occupational lifting, risks related to force overshoots in lifting large objects can persist despite experience in lifting the objects and despite the use of labels indicating the weight of the objects. PMID:16147418

Kingma, Idsart; Van Dieën, Jaap H; Toussaint, Huub M

2005-06-22

43

49 CFR 37.165 - Lift and securement use.  

Code of Federal Regulations, 2011 CFR

...ramps and lifts. If it is necessary for the personnel to leave their seats to provide this assistance, they shall do so...may decline to carry a wheelchair/occupant if the combined weight exceeds that of the lift specifications or if carriage of...

2011-10-01

44

49 CFR 37.165 - Lift and securement use.  

Code of Federal Regulations, 2012 CFR

...may decline to carry a wheelchair/occupant if the combined weight exceeds that of the lift specifications or if carriage of the...ramps and lifts. If it is necessary for the personnel to leave their seats to provide this assistance, they shall do...

2012-10-01

45

Observing how others lift light or heavy objects: which visual cues mediate the encoding of muscular force in the primary motor cortex?  

PubMed

Observers are able to judge quite accurately the weights lifted by others. Only recently, neuroscience has focused on the role of the motor system to accomplish this task. In this respect, a previous transcranial magnetic stimulation (TMS) study showed that the muscular force requirements of an observed action are encoded by the primary motor cortex (M1). Overall, three distinct visual sources may provide information on the applied force of an observed lifting action, namely, (i) the perceived kinematics, (ii) the hand contraction state and finally (iii) intrinsic object properties. The principal aim of the present study was to disentangle these three visual sources and to explore their importance in mediating the encoding of muscular force requirements in the observer's motor system. A series of experiments are reported in which TMS was used to measure 'force-related' responses from the hand representation in left M1 while subjects observed distinct action-stimuli. Overall, results indicated that observation-induced activity in M1 reflects the level of observed force when kinematic cues of the lift (exp. 1) or cues on the hand contraction state (exp. 2) are available. Moreover, when kinematic cues and intrinsic object properties provide distinct information on the force requirements of an observed lifting action, results from experiment 3 indicated a strong preference for the use of kinematic features in mapping the force requirements of the observed action. In general, these findings support the hypothesis that the primary motor cortex contributes to action observation by mapping the muscle-related features of observed actions. PMID:20381505

Alaerts, Kaat; Swinnen, Stephan P; Wenderoth, Nicole

2010-04-08

46

Human exposure to heavy metals. Rare earth pneumoconiosis in occupational workers.  

PubMed

A male subject exposed for many years to rare earth (RE)-containing fumes and dusts emitted from carbon arc lamps in photoengraving laboratories was investigated to rule out RE pneumoconiosis. While chest x-ray films showed a severe pulmonary fibrosis, clinical analysis showed obvious high RE concentrations in the pulmonary and lymph node biopsy specimens compared with the corresponding tissues of 11 unexposed subjects. In addition to other elements, levels of thorium (Th), which is generally present as an impurity of RE compounds, were also determined to estimate the radiation dose which may be involved in inducing pneumoconiosis. The results show that the levels of Th are more than two orders of magnitude lower than the maximum permissible concentration for occupational exposure to natural 232Th, suggesting that the long-term accumulation of RE in the lungs played a role in the pathogenesis of the observed pulmonary fibrosis of the worker. PMID:6839821

Vocaturo, G; Colombo, F; Zanoni, M; Rodi, F; Sabbioni, E; Pietra, R

1983-05-01

47

Dynamic lifting by whole body motion of humanoid robots  

Microsoft Academic Search

A motion control method of lifting a heavy object up to a higher position with humanoid robots is developed. The key issue of lifting motion is how to reduce the load on humanoid arms in which low-power actuators are implemented. The use of singular postures of arms is well-known to avoid actuator saturation of the arms. By combining two different

Hitoshi Arisumi; Sylvain Miossec; Jean-rémy Chardonnet; Kazuhito Yokoi

2008-01-01

48

NIOSH Comments to DOL on the Occupational Safety and Health Administration Request for Comments and Information on Health and Safety Standards; Manual Lifting by R. A. Lemen, June 30, 1987.  

National Technical Information Service (NTIS)

The testimony contains comments that NIOSH requests be attached as supplemental information to the request of OSHA for safety standards in manual lifting tasks. The topics considered in the supplementatl information include the usefulness of employee scre...

1987-01-01

49

30526 artificial lift  

SciTech Connect

This book focuses on the four major methods of artificial lift: sucker-rod pumping, gas lift, electrical submersible pumping (ESP) and hydraulic pumping. Though more than 80% of artificially lifted wells worldwide are rod-pumped, the large majority of these wells are low-volume, stripper-type producers. For this reason, sucker-rod pumping papers comprise less than 40% of the 26 SPE papers selected.

Not Available

1989-01-01

50

Farming Activities and Carrying and Lifting: The Agricultural Health Study  

PubMed Central

Background Heavy carrying and lifting (HCL) is a common activity among farmers that may be related to health. The aim of this study was to examine HCL as a proxy for occupational physical activity (PA) among farm residents. The secondary objective was to evaluate PA based on HCL. Methods Data from 21,296 farmers and 30,951 spouses in the Agricultural Health Study examined the relationship between HCL and farm activities and individual/farm characteristics. HCL was categorized as ?1 or <1 hours per day. The association between HCL and farm activities (15 for farmers; 16 for spouses) and individual/farm characteristics was examined using adjusted logistic regression. To evaluate PA, we created a PA activity index using metabolic equivalents for HCL, and compared PA weekly averages with national guidelines. Results In adjusted results, most farm activities were significantly associated with HCL. Based on HCL, farmers had a median of 1.5 hours and spouses 0.5 hours of vigorous or muscle-strengthening PA per day. Most farmers (94%) and about 60% of spouses meet or exceed 2008 national guidelines for vigorous or muscle-strengthening PA. Conclusion Findings suggest the HCL measure may be useful as a PA metric in future studies of occupational PA among farm residents.

Laditka, Sarah B.; Dmochowski, Jacek; Alavanja, Michael; Lee, Duck-chul; Hoppin, Jane A.

2010-01-01

51

View south; detail of top of lift span and lifting ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View south; detail of top of lift span and lifting cables. - Naval Base Philadelphia-Philadelphia Naval Shipyard, Lift Bridge, Mouth of Reserve Basin, League Island, Philadelphia, Philadelphia County, PA

52

Does the asymmetry multiplier in the 1991 NIOSH lifting equation adequately control the biomechanical loading of the spine?  

Microsoft Academic Search

The aim of this research was to evaluate whether the asymmetry multiplier incorporated in the 1991 National Institute for Occupational Safety and Health lifting equation adequately controls the biomechanical spine loads during asymmetric lifting. Sixteen male subjects lifted a box from four initial locations varying in terms of the angular deviation from the mid-sagittal plane (0, 30, 60 and 90°).

S. A. Lavender; Y. C. Li; R. N. Natarajan; G. B. J. Andersson

2009-01-01

53

Interior of lift mechanism area of eastern lift span, looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior of lift mechanism area of eastern lift span, looking northwest. - Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memorial & Arlington National Cemetery, Washington, District of Columbia, DC

54

Mobile Lifting Jack.  

National Technical Information Service (NTIS)

A mobile jack, particularly for use in installation of support beams in underground mines, is disclosed. The jack comprises a wheel-mounted frame and a hydraulic lifting arm having a jack head which is horizontally rotatable 360 deg. The lifting arm is al...

R. L. Unger T. G. Bobick

1987-01-01

55

Understanding Wing Lift  

ERIC Educational Resources Information Center

The conventional explanation of aerodynamic lift based on Bernoulli's equation is one of the most common mistakes in presentations to school students and is found in children's science books. The fallacies in this explanation together with an alternative explanation for aerofoil lift have already been presented in an excellent article by Babinsky…

Silva, J.; Soares, A. A.

2010-01-01

56

Understanding Wing Lift  

ERIC Educational Resources Information Center

|The conventional explanation of aerodynamic lift based on Bernoulli's equation is one of the most common mistakes in presentations to school students and is found in children's science books. The fallacies in this explanation together with an alternative explanation for aerofoil lift have already been presented in an excellent article by Babinsky…

Silva, J.; Soares, A. A.

2010-01-01

57

Catwalk grate lifting tool  

DOEpatents

A device is described for lifting catwalk grates comprising an elongated bent member with a handle at one end and a pair of notched braces and a hook at the opposite end that act in conjunction with each other to lock onto the grate and give mechanical advantage in lifting the grate. 10 figs.

Gunter, L.W.

1992-08-11

58

Portable Seat Lift.  

National Technical Information Service (NTIS)

A portable seat lift that can help individuals either (1) lower themselves to a sitting position or (2) raise themselves to a standing position is presented. The portable seat lift consists of a seat mounted on a base with two levers, which are powered by...

B. Weddendorf

1992-01-01

59

More Than Meets the Eye: Weight Lifting and Steroid Use in Men  

Microsoft Academic Search

This article reports on a qualitative study of men's motivations for and experiences with heavy weight lifting, dieting, and steroid use. Eight male research participants described their experiences with heavy weight lifting, dieting, and steroid use using a story format with a beginning, middle, and end. The 9 main themes were: (a) I am not good enough; (b) judging genetics;

Angela D. Bardick; Gary Nixon; Kerry B. Bernes

2008-01-01

60

Samus Counter Lifting Fixture  

SciTech Connect

A lifting fixture has been designed to handle the Samus counters. These counters are being removed from the D-zero area and will be transported off site for further use at another facility. This fixture is designed specifically for this particular application and will be transferred along with the counters. The future use of these counters may entail installation at a facility without access to a crane and therefore a lift fixture suitable for both crane and/or fork lift usage has been created The counters weigh approximately 3000 lbs. and have threaded rods extended through the counter at the top comers for lifting. When these counters were first handled/installed these rods were used in conjunction with appropriate slings and handled by crane. The rods are secured with nuts tightened against the face of the counter. The rod thread is M16 x 2({approx}.625-inch dia.) and extends 2-inch (on average) from the face of the counter. It is this cantilevered rod that the lift fixture engages with 'C' style plates at the four top comers. The strongback portion of the lift fixture is a steel rectangular tube 8-inch (vertical) x 4-inch x .25-inch wall, 130-inch long. 1.5-inch square bars are welded perpendicular to the long axis of the rectangular tube at the appropriate lift points and the 'C' plates are fastened to these bars with 3/4-10 high strength bolts -grade 8. Two short channel sections are positioned-welded-to the bottom of the rectangular tube on 40 feet centers, which are used as locators for fork lift tines. On the top are lifting eyes for sling/crane usage and are rated at 3500 lbs. safe working load each - vertical lift only.

Stredde, H.; /Fermilab

1998-05-27

61

Understanding wing lift  

NASA Astrophysics Data System (ADS)

The conventional explanation of aerodynamic lift based on Bernoulli's equation is one of the most common mistakes in presentations to school students and is found in children's science books. The fallacies in this explanation together with an alternative explanation for aerofoil lift have already been presented in an excellent article by Babinsky (2003 Phys. Educ. 38 497-503). However, in Babinsky's explanation, the air friction forces are ignored and the flow-field curvature introduced by the aerofoil shape is understood intuitively. In this article, a simple analysis of the lift with friction forces incorporated is presented to give a more precise qualitative explanation.

Silva, J.; Soares, A. A.

2010-05-01

62

NOVA: Lift and Drag  

NSDL National Science Digital Library

This interactive tutorial examines the aerodynamic forces of lift and drag. Students explore the two principles that combine to produce lift: the Bernoulli Effect and Newton's Third Law. The tutorial discusses why wing shape alone cannot create lift. Airplanes stay aloft because the wing pushes air down; the corresponding reaction occurs as air pushes the wing up. This paired action/reaction, along with wing shape and airspeed, interact to produce flight. This resource is part of the NOVA digital collection on space and flight.

2011-10-03

63

Past Projects - Lifting Bodies  

NASA Website

Publications To learn more about the HL-10 check out the following publications: Testing the Lifting Bodies at Edwards Wingless Flight These publications can be purchased by contacting the Dryden Public Affairs office at (661) 276-3449.

64

Hydraulic Lifting Device.  

National Technical Information Service (NTIS)

A piston and cylinder assembly is disclosed which is constructed of polyvinyl chloride that uses local water pressure to perform small lifting tasks. The chamber is either pressurized to extend the piston or depressurized to retract the piston. The presen...

K. Terrell

1990-01-01

65

Aerodynamic Lifting Force.  

ERIC Educational Resources Information Center

|Describes some experiments showing both qualitatively and quantitatively that aerodynamic lift is a reaction force. Demonstrates reaction forces caused by the acceleration of an airstream and the deflection of an airstream. Provides pictures of demonstration apparatus and mathematical expressions. (YP)|

Weltner, Klaus

1990-01-01

66

FREIGHT CONTAINER LIFTING STANDARD  

SciTech Connect

This standard details the correct methods of lifting and handling Series 1 freight containers following ISO-3874 and ISO-1496. The changes within RPP-40736 will allow better reading comprehension, as well as correcting editorial errors.

POWERS DJ; SCOTT MA; MACKEY TC

2010-01-13

67

Assessment of Lift Augmentation Devices.  

National Technical Information Service (NTIS)

Contents: Aerodynamics of mechanical high-lift devices; Aerodynamics of pneumatic high-lift devices; Aerodynamics of variable sweep; Fundamental aspects of flow separation under high-lift conditions; Some notes on two-dimensional high-lift tests in wind-t...

1971-01-01

68

High-rate artificial lift  

SciTech Connect

This paper summarizes the major considerations in the selection, design, installation, operation, or repair of high-rate artificial-lift systems. The major types of artificial lift - sucker-rod pumps, gas-lift systems, electrical submersible pumps, hydraulic pumps and jets, and hydraulic turbine-driven pumps - will be discussed. An extensive bibliography of artificial-lift papers is included.

Clegg, J.D.

1988-03-01

69

BIOMECHANICAL SIMULATION OF HUMAN LIFTING  

Microsoft Academic Search

The aim of this paper is to simulate several levels of lifting strategies from parameters depending on the subject's centre of mass movements. Usually, symmetrical lifting strategies were categorized in two major solutions (Chaffin and Andersson, 1991): the squat lift that mainly involves a knee flexion and the back lift that mainly involves hip flexions. In the literature two main

COLOBERT B. MULTON

70

A hypersonic lift mechanism with decoupled lift and drag surfaces  

NASA Astrophysics Data System (ADS)

In the present study, we propose a novel lift mechanism for which the lifting surface produces only lift. This is achieved by mounting a two-dimensional shock-shock interaction generator below the lifting surface. The shock-shock interaction theory in conjunction with a three dimensional correction and checked with computational fluid dynamics (CFD) is used to analyze the lift and drag forces as function of the geometrical parameters and inflow Mach number. Through this study, though limited to only inviscid flow, we conclude that it is possible to obtain a high lift to drag ratio by suitably arranging the shock interaction generator.

Xu, YiZhe; Xu, ZhiQi; Li, ShaoGuang; Li, Juan; Bai, ChenYuan; Wu, ZiNiu

2013-05-01

71

A 2-D simulation model for lifting activities  

Microsoft Academic Search

Occupational biomechanics models deal with the evaluation of physical activities such as lifting of loads. This allows the user to determine the stresses imposed on the musculoskeletal system while holding or moving a load. These models are useful tools in estimating these stresses especially those imposed on the lumbar spine. dynamic biomechanical models, as opposed to static models require the

M. M. Ayoub

1998-01-01

72

4. DETAIL OF VERTICAL LIFT SPAN SHOWING CONCRETE PIERS, LIFT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. DETAIL OF VERTICAL LIFT SPAN SHOWING CONCRETE PIERS, LIFT TOWERS, AND THROUGH TRUSS, LOOKING SOUTHEAST. - Shippingsport Bridge, Spanning Illinois River at State Route 51, La Salle, La Salle County, IL

73

Interior view of lift mechanism area of eastern lift span, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view of lift mechanism area of eastern lift span, showing trunion gears at left and right, and counterweight above. - Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memorial & Arlington National Cemetery, Washington, District of Columbia, DC

74

Interior view of lift mechanism area of eastern lift span ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view of lift mechanism area of eastern lift span looking south, showing trunion gears at left and right, and counterweight above. - Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memorial & Arlington National Cemetery, Washington, District of Columbia, DC

75

Waste Package Lifting Calculation  

SciTech Connect

The objective of this calculation is to evaluate the structural response of the waste package during the horizontal and vertical lifting operations in order to support the waste package lifting feature design. The scope of this calculation includes the evaluation of the 21 PWR UCF (pressurized water reactor uncanistered fuel) waste package, naval waste package, 5 DHLW/DOE SNF (defense high-level waste/Department of Energy spent nuclear fuel)--short waste package, and 44 BWR (boiling water reactor) UCF waste package. Procedure AP-3.12Q, Revision 0, ICN 0, calculations, is used to develop and document this calculation.

H. Marr

2000-05-11

76

Mathematical Analysis of Scissor Lifts.  

National Technical Information Service (NTIS)

This document presents mathematical techniques for analyzing reaction forces in scissor lifts. It also presents several design issues including actuator placement, member cross-section, and rigidity. Keywords: Jacks(Lifts), Mathematical analysis, Actuator...

H. M. Spackman

1989-01-01

77

Drag and lift  

NSDL National Science Digital Library

This activity introduces students to the aerodynamic basics of lift and drag. The materials needed are pieces of cardboard 20 x 30 inches and other size cardboard pieces. This would be a suitable activity for small groups. Copyright 2005 International Technology Education Association

Aerospace, Cislunar

1997-01-01

78

Lifting as You Climb  

ERIC Educational Resources Information Center

This article addresses leadership themes and answers leadership questions presented to "Exchange" by the Panel members who attended the "Exchange" Panel of 300 Reception in Dallas, Texas, last November. There is an old proverb that encourages people to lift as they climb: "While you climb a mountain, you must not forget others along the way." With…

Sullivan, Debra R.

2009-01-01

79

Eyebolts for Lift Suspension.  

National Technical Information Service (NTIS)

BS529 was first published in 1944. It was divided into two parts, Part 1 specified Steel Eyebolts With Collars and Part 2 specified Steel Eyebolts Without Collars for Lift Suspension. Subsequent to its publication, BS529 was amended several times and even...

T. Gorley

1984-01-01

80

Evaluation of ceiling lifts in health care settings: patient outcome and perceptions.  

PubMed

Ceiling lifts have been introduced into health care settings to reduce manual patient lifting and thus occupational injuries. Although growing evidence supports the effectiveness of ceiling lifts, a paucity of research links indicators, such as quality of patient care or patient perceptions, to the use of these transfer devices. This study explored the relationship between ceiling lift coverage rates and measures of patient care quality (e.g., incidence of facility-acquired pressure ulcers, falls, urinary infections, urinary incontinence, and assaults [patient to staff] in acute and long-term care facilities), as well as patient perceptions of satisfaction with care received while using ceiling lifts in a complex care facility. Qualitative semi-structured interviews were used to generate data. A significant inverse relationship was found between pressure ulcer rates and ceiling lift coverage; however, this effect was attenuated by year. No significant relationships existed between ceiling lift coverage and patient outcome indicators after adding the "year" variable to the model. Patients generally approved of the use of ceiling lifts and recognized many of the benefits. Ceiling lifts are not detrimental to the quality of care received by patients, and patients prefer being transferred by ceiling lifts. The relationship between ceiling lift coverage and pressure ulcer rates warrants further investigation. PMID:19842612

Alamgir, Hasanat; Li, Olivia Wei; Gorman, Erin; Fast, Catherine; Yu, Shicheng; Kidd, Catherine

2009-09-01

81

Artificial lift concepts and timing  

Microsoft Academic Search

Selecting the best time to install artificial lift is a hard decision, and escalating oil prices are changing previously accepted practices with regard to artificial lift. Operating practices (abandonment water cut, well spacing, capacity of lift system, separator pressure, etc.) all contribute to the decision-making process. Initial equipment cost, and present and predicted future also must be considered. This work

1980-01-01

82

Criteria for the forehead lift  

Microsoft Academic Search

We have developed clinically useful measurements to assist the surgeon in deciding when to do the forehead lift and where to place the incision. Also, we have reviewed our experience over the past decade and discuss the four categories and applications of forehead lifts. We use three indications for forehead lift: ptosis, creases, and previous facelift (PCP). There are four

Peter McKinney; Raymond D. Mossie; Mark L. Zukowski

1991-01-01

83

Development of OTEC lift cycles  

SciTech Connect

An OTEC lift cycle system may be considered an open power cycle that uses an hydraulic turbine for power generation instead of the very low pressure steam turbine used in the Claude open cycle. It offers an alternate approach to the utilization of ocean thermal energy. The lift cycle power plant can have many different system options depending on the lift process employed. Foam and mist lift processes are presently under development sponsored by the US Department of Energy and are currently in the technical feasibility development stage. The concept of lift cycles, recent developments, preliminary cost estimates, and possible further activities are presented.

Chen, F.C.; Michel, J.W.

1980-01-01

84

Face Lift Postoperative Recovery  

Microsoft Academic Search

.   The purpose of this paper is to describe what I have studied and experienced, mainly regarding the control and prediction\\u000a of the postoperative edema; how to achieve an agreeable recovery and give positive support to the patient, who in turn will\\u000a receive pleasant sensations that neutralize the negative consequences of the surgery.\\u000a \\u000a After the skin is lifted, the drainage

A. Aldo Mottura

2002-01-01

85

The subcutaneous forehead lift.  

PubMed

A limited experience (27 patients, all female) is presented utilizing the subcutaneous approach to forehead lifting. This approach has been little utilized and has been condemned in the literature for being dangerous. However, no difficulties in wound healing or alopecia have been encountered, and the procedure has the advantages of more effectively removing the vertical and transverse wrinkles in the glabellar region, raising the brows, and preserving sensation to the scalp posterior to the incision. PMID:2911624

Wolfe, S A; Baird, W L

1989-02-01

86

Cavitation Induced Lift Fluctuations  

NASA Astrophysics Data System (ADS)

For various reasons, liquid handling devices, such as pumps, turbines, marine propellers and hydrofoils must often operate in the cavitating regime. Considerable research has gone into avoiding cavitation but little effort has been made to understand the complex physics associated with operation in the partially cavitating regime. This is an experimental study of lift oscillations on a NACA 0015 hydrofoil. Fluctuating lift is measured at two different geometric scales in two different water tunnels. The spectral characteristics of the fluctuations are found to vary considerable over a range of 1.0 ?/2×? 8.5. The amplitude of the fluctuations can exceed 100% of the steady state lift and are associated with the periodic shedding of vortical clouds of bubbles into the flow. Two competing mechanisms are found for the induced shedding of cloud cavitation. At high values of ?/2×?, reentrant jet physics dominate, with sheet cavity oscillations at a frequency, based on cavity length, of fl/U equal 0.3. At low values of ?/2×? , bubbly flow shock wave phenomena dominate with a constant Strouhal number based on chord length of fc/U equal 0.2. A significant effect on the wake structure is also noted. Good agreement with numerical simulations based on the LES technique is generally found. Sponsored by the National Science Foundation and the Office of Naval Research.

Arndt, Roger E. A.; Keller, Anreas; Kjeldsen, Morten

1999-11-01

87

Detail of lift wire rope attachment to lift span at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of lift wire rope attachment to lift span at southeast corner. Note rope-adjustment turnbuckle with strap keepers to prevent its rotation, which could pull the bridge out of alignment. A single rope and light-gauge attachment at each corner were adequate for lifting the span because most of its weight was balanced by the two counterweights. - Potomac Edison Company, Chesapeake & Ohio Canal Bridge, Spanning C & O Canal South of U.S. 11, Williamsport, Washington County, MD

88

Adaptive wavelet transforms via lifting  

Microsoft Academic Search

This paper develops two new adaptive wavelet transforms based on the lifting scheme. The lifting construction exploits a spatial-domain, prediction-error interpretation of the wavelet transform and provides a powerful framework for designing customized transforms. We use the lifting construction to adaptively tune a wavelet transform to a desired signal by optimizing data-based prediction error criteria. The performances of the new

Roger L. Claypoole; Richard G. Baraniuk; Robert D. Nowak

1998-01-01

89

But can they lift?  

PubMed

Anybody who screens EMS field candidates will tell you, not just anybody can do EMS. You need a good brain to pass your tests, earn your certs and think your way through calls. You need the manual dexterity and multitasking capabilities of an ED nurse. You need the maturity and psychomotor skills of a professional driver. You need a warm and willing heart. And, no matter how talented you are in all of those areas, you need to be able to lift--often, a lot. PMID:18810957

Dick, Thom; Messersmith, Darrell

2008-06-01

90

Chair Lift Challenge  

NSDL National Science Digital Library

In this activity, learners explore the unique challenges in transportation engineering, such as devising a method for skiers or hikers to get to the top of a mountain. Students work in teams to design a chair lift made out of everyday materials that can carry a tennis ball up a rope line and back down in a controlled manner so that the ball does not fall out of the cup. They sketch their plans, consider material selection, build their system, test it, reflect on the challenge, and present their experiences to their class.

Ieee

2013-07-08

91

Air Lift: Ski Jump  

NSDL National Science Digital Library

The following resource is from Lessonopoly, which has created student activities and lesson plans to support the video series, Science of the Olympic Winter Games, created by NBC Learn and the National Science Foundation. Featuring exclusive footage from NBC Sports and contributions from Olympic athletes and NSF scientists, the series will help teach your students valuable scientific concepts. In this lesson, Students will learn about the ski-jumping competition in the Winter Olympics, to explore concepts about gravity, drag and lift. Students will create their own version of a ski jump complete with jumpers.

2010-01-01

92

Selection of artificial lift method  

SciTech Connect

This paper summarizes the opening remarks of the panel members on a panel discussion of 'Selection of Artificial Lift Method' held at the 56th annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME in San Antonio, Texas, October 5-7, 1981. The topics discussed include: (1) reservoir and well considerations involved in artificial lift design; (2) sucker rod pumping; (3) gas lift; (4) submersible pumping; and, (5) hydraulic pumping. Advantages and limitations of each lift method are considered.

Neely, B.; Gipson, F.; Clegg, J.; Capps, B.; Wilson, P.

1981-01-01

93

Endoscopic brow lifts: have they replaced coronal lifts?  

PubMed

This article describes the use of the endoscopic brow-lifting technique in addressing periorbital aging. This article discusses the advantages and disadvantage of the endoscopic versus traditional techniques of brow lifting and gives our treatment algorithm depending on patient needs. PMID:23731581

Javidnia, Hedyeh; Sykes, Jonathan

2013-05-01

94

Initiating Piloted Mars Expeditions with Medium-Lift Launch Systems  

NASA Astrophysics Data System (ADS)

A method of accomplishing manned expeditions to Mars with existing medium-lift launch systems is discussed. In this architecture, 20-tonne propulsion stages are placed individually in low-Earth orbit, where they are mated to Mars-bound payloads and ignited at successive perigees to execute trans-Mars injection. Spacecraft follow conjunction-class trajectories to the red planet and utilize aerobraking for orbital capture and descent. Return vehicles are fuelled with methane/oxygen bipropellant synthesized primarily from Martian resources. Dispatching expeditions from orbit with individual, high-energy stages - rather than directly from the Earth's surface - allows for the division of mission mass into more manageable components, which can be launched by vehicles that exist today. This plan does not require the development of heavy-lift launch technology: an effective yet costly proposition that may otherwise hinder current space exploration initiatives. Without the need for heavy-lift boosters, manned missions to Mars can be undertaken presently, and within the constraints of today's space exploration budgets. It is concluded that the mission design herein represents a less robust, though more economically viable method for initiating manned Mars exploration than proposals which require heavy-lift technology - an alternative method by which a new planet could be opened to humanity.

Bonin, G. R.

95

A rod pumping system for California lift requirements  

SciTech Connect

Artificial lift requirements in California oil fields cover a full range of demanding operating and environmental conditions. These extend from typical demands of lifting depth and volume, to atypical requirements of heavy crude, thermal enhancement and the unique environmental restrictions of our urban sites and offshore fields. A new rod pumping system has been developed which deals with these requirements. Performance results to date confirm reduced power consumption and improved pumping performance. Combined with the compact equipment size, these characteristics appear to offer benefits to California operators.

Tait, H.C.

1983-03-01

96

Occupational exposure to heavy metals: DNA damage induction and DNA repair inhibition prove co-exposures to cadmium, cobalt and lead as more dangerous than hitherto expected.  

PubMed

Co-exposure to cadmium, cobalt, lead and other heavy metals occurs in many occupational settings, such as pigment and batteries production, galvanization and recycling of electric tools. However, little is known about interactions between several heavy metals. In the present study we determined DNA single strand break (DNA-SSB) induction and repair capacity for 8-oxoguanine in mononuclear blood cells of 78 individuals co-exposed to cadmium (range of concentrations in air: 0.05-138.00 micro g/m(3)), cobalt (range: 0-10 micro g/m(3)) and lead (range: 0-125 micro g/m(3)). Exposure to heavy metals was determined in air, blood and urine. Non-parametric correlation analysis showed a correlation between cadmium concentrations in air with DNA-SSB (P = 0.001, R = 0.371). Surprisingly, cobalt air concentrations correlated even better (P < 0.001, R = 0.401), whereas lead did not correlate with DNA-SSB. Logistic regression analysis including 11 possible parameters of influence resulted in a model showing that cobalt in air, cadmium in air, cadmium in blood and lead in blood influence the level of DNA-SSB. The positive result with cobalt was surprising, since exposure levels were much lower compared with the TRK-value of 100 micro g/m(3). To examine, whether the positive result with cobalt is stable, we applied several logistic regression models with two blocks, where all factors except cobalt were considered preferentially. All strategies resulted in the model described above. Logistic regression analysis considering also all possible interactions between the relevant parameters of influence finally resulted in the following model: Odds ratio = 1.286(Co in air) x 1.040(Cd in air) x 3.111(Cd in blood) x 0.861(Pb in air) x 1.023(Co in air x Pb in air). This model correctly predicts an increased level of DNA-SSB in 91% of the subjects in our study. One conclusion from this model is the existence of more than multiplicative effects for co-exposures of cadmium, cobalt and lead. For instance increasing lead air concentrations from 1.6 to 50 micro g/m(3) in the presence of constant exposures to cobalt and cadmium (8 micro g/m(3) and 3.8 micro g/m(3)) leads to an almost 5-fold increase in the odds ratio, although lead alone does not increase DNA-SSB. The mechanism behind these interactions might be repair inhibition of oxidative DNA damage, since a decrease in repair capacity will increase susceptibility to reactive oxygen species generated by cadmium or cobalt. Indeed, repair of 8-oxoguanine decreased with increasing exposures and inversely correlated with the level of DNA-SSB (P = 0.001, R = -0.427). Protein expression patterns of individuals exposed to cobalt concentrations of approximately 10 micro g/m(3) were compared with those of unexposed individuals using two-dimensional gel electrophoresis. Qualitative and apparent quantitative alterations in protein expression were selective and certainly occurred in <0.1% of all proteins. In conclusion, the hazard due to cobalt exposure - that has been classified only as IIB by the IARC - seems to be underestimated, especially when individuals are co-exposed to cadmium or lead. Co-exposure may cause genotoxic effects, even if the concentrations of individual heavy metals do not exceed TRK-values. PMID:12538350

Hengstler, Jan G; Bolm-Audorff, Ulrich; Faldum, Andreas; Janssen, Kai; Reifenrath, Michael; Götte, Walter; Jung, Detlev; Mayer-Popken, Otfried; Fuchs, Jürgen; Gebhard, Susanne; Bienfait, Heinz Günter; Schlink, Kirsten; Dietrich, Cornelia; Faust, Dagmar; Epe, Bernd; Oesch, Franz

2003-01-01

97

Lifting as an Industrial Hazard  

Microsoft Academic Search

A great deal of accident prevention education has been directed toward the reduction of back injuries. This has not produced any great change in the incidence of this condition, and the author presents evidence that there can be no specific and mandatory method for lifting all loads. Virtually all types of lifting methods are possible and, in fact, are used

JOHN R. BROWN

1973-01-01

98

Shape memory alloy resetable spring lift for pedestrian protection  

NASA Astrophysics Data System (ADS)

Pedestrian protection has become an increasingly important aspect of automotive safety with new regulations taking effect around the world. Because it is increasingly difficult to meet these new regulations with traditional passive approaches, active lifts are being explored that increase the "crush zone" between the hood and rigid under-hood components as a means of mitigating the consequences of an impact with a non-occupant. Active lifts, however, are technically challenging because of the simultaneously high forces, stroke and quick timing resulting in most of the current devices being single use. This paper introduces the SMArt (Shape Memory Alloy ReseTable) Spring Lift, an automatically resetable and fully reusable device, which couples conventional standard compression springs to store the energy required for a hood lift, with Shape Memory Alloys actuators to achieve both an ultra high speed release of the spring and automatic reset of the system for multiple uses. Each of the four SMArt Device subsystems, lift, release, lower and reset/dissipate, are individually described. Two identical complete prototypes were fabricated and mounted at the rear corners of the hood, incorporated within a full-scale vehicle testbed at the SMARTT (Smart Material Advanced Research and Technology Transfer) lab at University of Michigan. Full operational cycle testing of a stationary vehicle in a laboratory setting confirms the ultrafast latch release, controlled lift profile, gravity lower to reposition the hood, and spring recompression via the ratchet engine successfully rearming the device for repeat cycles. While this is only a laboratory demonstration and extensive testing and development would be required for transition to a fielded product, this study does indicate that the SMArt Lift has promise as an alternative approach to pedestrian protection.

Barnes, Brian M.; Brei, Diann E.; Luntz, Jonathan E.; Strom, Kenneth; Browne, Alan L.; Johnson, Nancy

2008-04-01

99

What's happening in artificial lift  

SciTech Connect

New developments reported this year are primarily in the areas of electrical submersible pumps (ESPs), beam pumps, and gas lift. The available information includes new products, techniques for extending run life, controllers, monitors and various other products. Specific topics in this article include: ESP turn key leases for temporary lifting; Horizontal pumps; Gas diffusion coatings for ESP bushings and sleeves; ESP variable rate current-voltage recording monitor; Power tubing ESP status; Low volume, high efficiency ESP stage; ESP improvements for horizontal and abrasive conditions; ESP computer design program effort; Well analyzer; Beam pump controller with variable frequency drive; Hydraulic pumping units; Mobile swab unit for marginal wells; Device for unseating downhole pumps; Gas lift valve test stand; Plunger lift controllers; Resettable ESP packer; Power generation from wellhead gas; and Artificial lift PC design program.

Lea, J.F. (Amoco Production Research Co., Tulsa, OK (US)); Winkler, H.W.

1991-05-01

100

Physiological and psychophysical comparison between a lifting task with identical weight but different coupling factors.  

PubMed

The objective of the revised NIOSH (National Institute for Occupational Safety and Health) lifting equation is to prevent or reduce lifting-related injuries. The coupling component of the equation relates to quality of the grip (i.e., hand-to-object interface) and can be rated good, fair, or poor. Good coupling is theorized to reduce lifting stress, whereas poor coupling is theorized to increase lifting stress. This study compared the physiological and psychophysical stress between a lifting task with identical weight but different coupling factors. Subjects (n = 21; 26 +/- 6 years; 177.8 +/- 7.8 cm; 73.9 +/- 10.7 kg) transferred a milk crate or bag of dog food each weighing 12.5 kg back and forth from the floor to a table for 2, paced, 5-minute work bouts. Steady-state metabolic data were used to compare the lifting tasks. Results showed significantly higher oxygen consumption, caloric cost, heart rate, and rating of perceived exertion during the lifting task using the milk crate vs. the bag of dog food (p < 0.05). No difference in respiratory exchange ratio was observed (p > 0.05). In conclusion, a significantly higher metabolic cost and perceived exertion was observed when subjects performed a paced two-handed lifting task with good coupling factors than when using an object with poor coupling factors. When lifting stress is measured by metabolic cost and perceived exertion, these results are in contrast to expectations that a poor quality grip (i.e., poor coupling) would increase stress of a lifting task. Results of this study may help the work-place practitioner make decisions related to the use of the revised NIOSH lifting equation in the design and pacing of lifting-related tasks. Improved decision making may benefit productivity and enhance injury prevention in the workplace. PMID:20072069

Adams, Kent J; DeBeliso, Mark; Sevene-Adams, Patricia G; Berning, Joseph M; Miller, Tiev; Tollerud, David J

2010-02-01

101

Development of Nonpowered Lift for Wheelchair Users  

NASA Astrophysics Data System (ADS)

Wheelchair users need lifts to climb up/down steps at entrances with limited space. Lifts driven by motors or hydraulic equipment are large and expensive. They also need switches to start/stop actuators. The aim of our study is to develop a compact nonpowered lift for wheelchair users. We propose a lift driven by the wheels of a wheelchair on it. Coil springs are installed in the lift to decrease driving torque and some mechanisms are attached to the lift so that the small front casters of a wheelchair can cross the lift stage and the large rear wheels can drive the lift. After the lifting speed, driving force, and conditions for driving the rollers were analyzed and a prototype lift was designed and fabricated. The developed lift succeeded in raising a wheelchair with a user, and a continuous motion of a wheelchair from entering to exiting the stage was executed smoothly.

Kobayashi, Yusuke; Seki, Hiroaki; Kamiya, Yoshitsugu; Hikizu, Masatoshi; Maekawa, Mitsuyoshi

102

Occupational allergens  

Microsoft Academic Search

Occupational agents are important in a significant number of respiratory diseases. More than 250 occupational substances have\\u000a been reported to cause occupational asthma. Occupational allergens are the subset of agents causing occupational diseases\\u000a through an IgE-mediated mechanism. These allergens may be classified as being of either high or low molecular weight. The\\u000a more common occupational allergens and the industries at

Francis Lachowsky; Manuel Lopez

2001-01-01

103

Unilateral ankle immobilization alters the kinematics and kinetics of lifting.  

PubMed

BACKGROUND: Theoretical and empirical data support the notion that distal lower extremity joint dysfunction could influence the low-back injury potential of workers, but the impact of unilateral ankle immobilization on low-back loading during lifting has yet to be examined. OBJECTIVE: To examine the influence of unilateral ankle immobilization on the kinematics and kinetics of lifting. METHODS: With and without their right ankle immobilized, 10 men performed laboratory-simulated occupational lifting tasks. Together with force platform data, three-dimensional kinematics of the lumbar spine, pelvis, and lower extremities were collected, and a dynamic biomechanical model was used to calculate peak compressive and shear loads imposed on the L4/L5 intervertebral joint. RESULTS: In comparison to the unaffected conditions, ankle immobilization generally resulted in less knee (0.001 $les; p ? 0.07) and greater lumbar spine (0.001 ? p ? 0.35) sagittal motion when lifting. Associated with this compensatory movement strategy were greater L4/L5 anterior/posterior reaction shear forces (0.001 ? p ? 0.25). However, there were cases when individual compensatory movement strategies differed from the "group" response (i.e., subjects increased their sagittal knee motion on the affected side about 8% of the time); this resulted in increased peak L4/L5 joint compression forces without changing the peak L4/L5 anterior-posterior shear forces. CONCLUSIONS: Ankle dysfunction can alter the way in which individuals move and load their low-backs when lifting. The different ways in which individuals compensate for personal movement constraints could alter the potential site and mechanism of occupational low-back injury. PMID:23324721

Beach, Tyson A C; Frost, David M; Clark, Jessica M; Maly, Monica R; Callaghan, Jack P

2013-01-01

104

Occupational and leisure time physical activity in contrasting relation to ambulatory blood pressure  

PubMed Central

Background While moderate and vigorous leisure time physical activities are well documented to decrease the risk for cardiovascular disease, several studies have demonstrated an increased risk for cardiovascular disease in workers with high occupational activity. Research on the underlying causes to the contrasting effects of occupational and leisure time physical activity on cardiovascular health is lacking. The aim of this study was to examine the relation of objective and self-report measures of occupational and leisure time physical activity with 24-h ambulatory systolic blood pressure (BP). Methods Results for self-reported physical activity are based on observations in 182 workers (60% male, mean age 51 years), while valid objective physical activity data were available in 151 participants. The usual level of physical activity was assessed by 5 items from the Job Content Questionnaire (high physical effort, lifting heavy loads, rapid physical activity, awkward body positions and awkward positions of head or arms at work) and one item asking about the general level of physical activity during non-working time. On a regular working day, participants wore an ambulatory BP monitor and an accelerometer physical activity monitor during 24 h. Associations were examined by means of Analysis of Covariance. Results Workers with an overall high level of self-reported occupational physical activity as well as those who reported to often lift heavy loads at work had a higher mean systolic BP at work, at home and during sleep. However, no associations were observed between objectively measured occupational physical activity and BP. In contrast, those with objectively measured high proportion of moderate and vigorous leisure time physical activity had a significantly lower mean systolic BP during daytime, while no differences were observed according to self-reported level of leisure time physical activity. Conclusions These findings suggest that workers reporting static occupational physical activities, unlike general physically demanding tasks characterized by dynamic movements of large muscle groups, are related to a higher daily systolic BP, while high objective levels of moderate and vigorous leisure time physical activity are related to lower daytime systolic BP. Ambulatory systolic BP may be a physiological explanatory factor for the contrasting effects of occupational and leisure time physical activity.

2012-01-01

105

Gas lift valve  

SciTech Connect

A gas lift valve is described which consists of: a body, a main valve seat in the body, a main valve member cooperable with the seat to control flow through the body, a pressure dome including a depending bellows connected to the valve member, the bellows being exposed to pressure within the dome urging the valve member toward the seat and to pressure exterior of the body urging the valve member away from the seat, an internal valve seat between the bellows and the remainder of the dome, an internal valve member separate from and movable relative to and supported on the main valve member and cooperable with the internal valve seat to control flow therethrough, one of the internal valve member and seat constructed of polyimide material, hydraulic fluid in the dome extending to a level above the internal valve seat, and a sleeve of polyimide material having a sliding engagement with the interior of the bellows and supporting the bellows against distortion when subjected to a differential pressure thereacross.

Hamm, E.J.

1986-06-03

106

Spectra of lifted Ramanujan graphs  

Microsoft Academic Search

A random $n$-lift of a base graph $G$ is its cover graph $H$ on the vertices $[n]\\\\times V(G)$, where for each edge $u v$ in $G$ there is an independent uniform bijection $\\\\pi$, and $H$ has all edges of the form $(i,u),(\\\\pi(i),v)$. A main motivation for studying lifts is understanding Ramanujan graphs, and namely whether typical covers of such a

Eyal Lubetzky; Benny Sudakov; Van Vu

2009-01-01

107

Physiological, Biomechanical, and Medical Aspects of Lifting and Repetitive Lifting: A Review.  

National Technical Information Service (NTIS)

The literature relating to physiological and medical lifting and repetitive lifting is reviewed. Studies on maximal lifting capacity and maximal acceptable lift (MAL, the amount of weight that can be lifted repetitively over and 8h period) show that as th...

J. Knapik

1983-01-01

108

Effects of box weight, vertical location and symmetry on lifting capacities and ratings on category scale in Japanese female workers.  

PubMed

The aim was to clarify the effects of box weight, vertical location and symmetry on the lifting capacities and subjective burden in Japanese female workers with manual material handling tasks. Sixteen healthy females were tested. They performed 12 different lifting tasks (three heights * two weights * two symmetries). It is difficult for Japanese women to exert dynamic force in lifting a 15-kg weight from the elbow to the shoulder level. A remarkable increase was observed in heart rate and category scale with ratio properties (CR-10) on large muscle group in lifting a 15-kg weight as compared with lifting a 10-kg one. Judging from calculation of the Recommended Weight Limit using the application manual by the National Institute for Occupational Safe and Health, it was also suggested that lifting the 15-kg weight from the elbow to the shoulder level was difficult for female workers. Not only peak force, but also the average upward acceleration and peak velocity were lower in asymmetric liftings than those in symmetric liftings. CR-10 for the left back and right thigh were also higher in 90 degrees right lateral plane lifting than in the mid-sagittal plane. Thus, asymmetric lifting was supposed to impose higher stress on the back contralaterally and thigh ipsilaterally to the location of the weight. PMID:11191784

Hattori, Y; Ono, Y; Shimaoka, M; Hiruta, S; Shibata, E; Ando, S; Hori, F; Takeuchi, Y

2000-12-01

109

Review of occupational hazards associated with aquaculture.  

PubMed

Aquaculture is an emerging sector that is associated with most of the same hazards that are present in agriculture generally, but many fish farming tasks entail added danger, including working around water and working at night. Comprehensive studies of these hazards have not been conducted, and substantial uncertainty exists as to the extent of these hazards. The question addressed in this investigation was, "What is known about potential hazardous occupational exposures to aquatic plant and animal farmers?" In this review, causes of death included drowning, electrocution, crushing-related injury, hydrogen sulfide poisoning, and fatal head injury. Nonfatal injuries were associated with slips, trips, and falls; machines; strains and sprains; chemicals; and fires. Risk factors included cranes (tip over and power line contact), tractors and sprayer-equipped all-terrain vehicles (overturn), heavy loads (lifting), high-pressure sprayers, slippery surfaces, rotting waste (hydrogen sulfide production), eroding levees (overturn hazard), storm-related rushing water, diving conditions (bends and drowning), nighttime conditions, working alone, lack of training, lack of or failure to use personal flotation devices, and all-terrain vehicle speeding. Other hazards included punctures or cuts from fish teeth or spines, needlesticks, exposure to low temperatures, and bacterial and parasitic infections . PMID:20954037

Myers, Melvin L

2010-10-01

110

Normalized lift: an energy interpretation of the lift coefficient simplifies comparisons of the lifting ability of rotating and flapping surfaces.  

PubMed

For a century, researchers have used the standard lift coefficient C(L) to evaluate the lift, L, generated by fixed wings over an area S against dynamic pressure, ½?v(2), where v is the effective velocity of the wing. Because the lift coefficient was developed initially for fixed wings in steady flow, its application to other lifting systems requires either simplifying assumptions or complex adjustments as is the case for flapping wings and rotating cylinders.This paper interprets the standard lift coefficient of a fixed wing slightly differently, as the work exerted by the wing on the surrounding flow field (L/?·S), compared against the total kinetic energy required for generating said lift, ½v(2). This reinterpreted coefficient, the normalized lift, is derived from the work-energy theorem and compares the lifting capabilities of dissimilar lift systems on a similar energy footing. The normalized lift is the same as the standard lift coefficient for fixed wings, but differs for wings with more complex motions; it also accounts for such complex motions explicitly and without complex modifications or adjustments. We compare the normalized lift with the previously-reported values of lift coefficient for a rotating cylinder in Magnus effect, a bat during hovering and forward flight, and a hovering dipteran.The maximum standard lift coefficient for a fixed wing without flaps in steady flow is around 1.5, yet for a rotating cylinder it may exceed 9.0, a value that implies that a rotating cylinder generates nearly 6 times the maximum lift of a wing. The maximum normalized lift for a rotating cylinder is 1.5. We suggest that the normalized lift can be used to evaluate propellers, rotors, flapping wings of animals and micro air vehicles, and underwater thrust-generating fins in the same way the lift coefficient is currently used to evaluate fixed wings. PMID:22629326

Burgers, Phillip; Alexander, David E

2012-05-21

111

Normalized Lift: An Energy Interpretation of the Lift Coefficient Simplifies Comparisons of the Lifting Ability of Rotating and Flapping Surfaces  

PubMed Central

For a century, researchers have used the standard lift coefficient CL to evaluate the lift, L, generated by fixed wings over an area S against dynamic pressure, ½?v2, where v is the effective velocity of the wing. Because the lift coefficient was developed initially for fixed wings in steady flow, its application to other lifting systems requires either simplifying assumptions or complex adjustments as is the case for flapping wings and rotating cylinders. This paper interprets the standard lift coefficient of a fixed wing slightly differently, as the work exerted by the wing on the surrounding flow field (L/?·S), compared against the total kinetic energy required for generating said lift, ½v2. This reinterpreted coefficient, the normalized lift, is derived from the work-energy theorem and compares the lifting capabilities of dissimilar lift systems on a similar energy footing. The normalized lift is the same as the standard lift coefficient for fixed wings, but differs for wings with more complex motions; it also accounts for such complex motions explicitly and without complex modifications or adjustments. We compare the normalized lift with the previously-reported values of lift coefficient for a rotating cylinder in Magnus effect, a bat during hovering and forward flight, and a hovering dipteran. The maximum standard lift coefficient for a fixed wing without flaps in steady flow is around 1.5, yet for a rotating cylinder it may exceed 9.0, a value that implies that a rotating cylinder generates nearly 6 times the maximum lift of a wing. The maximum normalized lift for a rotating cylinder is 1.5. We suggest that the normalized lift can be used to evaluate propellers, rotors, flapping wings of animals and micro air vehicles, and underwater thrust-generating fins in the same way the lift coefficient is currently used to evaluate fixed wings.

Burgers, Phillip; Alexander, David E.

2012-01-01

112

Mist lift analysis summary report  

SciTech Connect

The mist flow open-cycle OTEC concept proposed by S.L. Ridgway has much promise, but the fluid mechanics of the mist flow are not well understood. The creation of the mist and the possibility of droplet growth leading to rainout (when the vapor can no longer support the mist) are particularly troublesome. This report summarizes preliminary results of a numerical analysis initiated at SERI in FY79 to study the mist-lift process. The analysis emphasizes the mass transfer and fluid mechanics of the steady-state mist flow and is based on one-dimensional models of the mist flow developed for SERI by Graham Wallis. One of Wallis's models describes a mist composed of a single size of drops and another considers several drop sizes. The latter model, further developed at SERI, considers a changing spectrum of discrete drop sizes and incorporates the mathematics describing collisions and growth of the droplets by coalescence. The analysis results show that under conditions leading to maximum lift in the single-drop-size model, the multigroup model predicts significantly reduced lift because of the growth of droplets by coalescence. The predicted lift height is sensitive to variations in the mass flow rate and inlet pressure. Inclusion of a coasting section, in which the drops would rise ballistically without change in temperature, may lead to increased lift within the existing range of operation.

Davenport, R.L.

1980-09-01

113

Individual and occupational risk factors for knee osteoarthritis: results of a case-control study in Germany  

PubMed Central

Introduction A number of occupational risk factors are discussed in relation to the development and progress of knee joint diseases (for example, working in a kneeling or squatting posture, lifting and carrying heavy weights). Besides the occupational factors, a number of individual risk factors are important. The distinction between work-related and other factors is crucial in assessing the risk and in deriving preventive measures in occupational health. Methods In a case-control study, patients with and without symptomatic knee osteoarthritis (OA) were questioned by means of a standardised questionnaire complemented by a semi-standardised interview. Controls were matched and assigned to the cases by gender and age. Conditional logistic regression was used in analysing data. Results In total, 739 cases and 571 controls were included in the study. In women and men, several individual and occupational predictors for knee OA could be described: obesity (odds ratio (OR) up to 17.65 in women and up to 12.56 in men); kneeling/squatting (women, OR 2.52 (>8,934 hours/life); men, 2.16 (574 to 12,244 hours/life), 2.47 (>12,244 hours/life)); genetic predisposition (women, OR 2.17; men, OR 2.37); and sports with a risk of unapparent trauma (women, OR 2.47 (?1,440 hours/life); men, 2.58 (?3,232 hours/life)). In women, malalignment of the knee (OR 11.54), pain in the knee already in childhood (OR 2.08), and the daily lifting and carrying of loads (?1,088 tons/life, OR 2.13) were related to an increased OR; sitting and smoking led to a reduced OR. Conclusions The results support a dose-response relationship between kneeling/squatting and symptomatic knee OA in men and, for the first time, in women. The results concerning general and occupational predictors for knee OA reflect the findings from the literature quite well. Yet occupational risks such as jumping or climbing stairs/ladders, as discussed in the literature, did not correlate with symptomatic knee OA in the present study. With regards to occupational health, prevention measures should focus on the reduction of kneeling activities and the lifting and carrying of loads as well as general risk factors, most notably the reduction of obesity. More intervention studies of the effectiveness of tools and working methods for reducing knee straining activities are needed.

2010-01-01

114

A 3-D BIOMECHANICAL MODEL TO CALCULATE LOAD AT THE LUMBOSACRAL JOINT FOR MANUAL LIFTING TASKS  

Microsoft Academic Search

INTRODUCTION: Low back disorders(LBD) represent a major proportion of health problems, resulting in high costs for employers and placing high demands on health services. One source for LBD is manual lifting and load manipulation in work place situations. With an obligation to occupational safety and health (by national and European law) ergonomists are required to provide guidelines for practioners, which

Dagmar Kopal-Engelaender; Youlian Hong; Günter Wichardt

115

What's new in artificial lift  

SciTech Connect

Efficiency remains the byword for this era, and operators are looking for innovative equipment and methods to help them squeeze the last dollar of profit out of new and old wells alike. New developments pertaining to electric submersible pumps, beam pumps and gas lift discussed here include: Successful testing of a cable-suspended submersible pump design; Measurement of bottomhole pressure in ESP-produced wells; Advanced wellheads for submersible lift, hydraulic lift and injection wells; Downhole pump protectors for sand control; New design for an ESP motor; An ESP downhole pressure sensor tester; Pump assembly that minimizes fluid or gas pound; Beam pump motor controller; Relay for remote monitoring of beam units; Long, slow-stroke pumping unit; Portable rod pump analysis system; Wellhead assembly for installation and suspension of coil tubing while under pressure.

Lea, J.F.

1988-05-01

116

How plunger lift affects production  

SciTech Connect

Plunger lift is finding an increasing marketplace for application in the US. The system is advantageous in many circumstances because of low inital cost, little maintenance, and because it generally requires no external energy source. Typical applications for plunger lift are removal of liquids from a gas well, high-ratio oil well production, paraffin and hydrate control, and increased efficiency of intermittent gas lift wells. Main advantage of using a plunger to produce a well is economics. An industry-wide average installation will cost $3500 plus some service, which depends on the company furnishing the equipment. Compare this to a pumping unit to do the same job ($28,000) or a small compressor ($32,000). Also, there is no power consumption such as electricity (high initial cost to run to the lease) or gas consumed (at $2.40/mcf). All the energy is furnished by the well, including instrument gas.

Beauregard, E.M.; Ferguson, P.L.

1981-07-01

117

Occupational Asthma  

MedlinePLUS

Occupational Asthma: Tips to Remember Occupational asthma is caused by inhaling fumes, gases, dust or other potentially harmful substances while "on the job." Often, your symptoms are worse during ...

118

Geometry Program for Aerodynamic Lifting Surface Theory.  

National Technical Information Service (NTIS)

A computer program that provides the geometry and boundary conditions appropriate for an analysis of a lifting, thin wing with control surfaces in linearized, subsonic, steady flow is presented. The kernel function method lifting surface theory is applied...

R. T. Medan

1973-01-01

119

Lifting Surface Theory and Hydroelastic Instability.  

National Technical Information Service (NTIS)

A brief review is presented of the unsteady lifting surface theory and of the 'generalized lift operator' technique of inverting the 'downwash' integral equation. The integral equation approach is then employed to predice responses of various foils to pit...

S. Tsakonas W. R. Jacobs M. R. Ali

1973-01-01

120

Optimization-based Dynamic Human Lifting Prediction.  

National Technical Information Service (NTIS)

In this study, an optimization-based approach for simulating the lifting motion of a three dimensional digital human model is presented. Lifting motion is generated by minimizing a performance measure subjected to basic physical and kinematical constraint...

H. Chung J. Kim R. Bhatt S. Rahmatalla Y. Xiang

2008-01-01

121

Occupational asthma.  

PubMed

This article review recent developments in the study of occupational asthma and implications for the overall understanding of asthma. Occupational asthma is a clinical syndrome caused by many different agents. Contribution of studies of experimental inhalation challenge using occupational agents to the knowledge of asthmatic reactions and their mechanisms is discussed. Investigations in the occupational environment into predisposing factors and persistence or recovery after exposure to an allergic agent or nonspecific irritant are reviewed. Approaches to diagnosing asthma in the occupational environment and to assessing functional impairment and disability are outlined. Directions for future research are identified. PMID:3556062

Chan-Yeung, M; Malo, J L

1987-06-01

122

The anterior vertical SMAS lift  

Microsoft Academic Search

With minimal skin and SMAS undermining, as well as a rotation point that is closest to the nasolabial folds and jowls, the “anterior vertical SMAS lift” reduces the risk of hematoma while optimizing direct pull on those surface features that require improvement. The vertical rotation enhances the malar region and decreases preauricular skin excision. Further, the author has found this

Robert W. Bernard

2003-01-01

123

What's new in artificial lift  

SciTech Connect

Changes in the US industry seem to necessitate increased emphasis on energy conservation, better run-lives and equipment optimization. International operations are more concerned with equipment reliability and maintaining production. Following are some new concepts in gas lift and submersible pumps used in both areas. Beam and progressive cavity pumps, hydraulic jet and reciprocating pumps and control methods are included.

Lea, J.F. (Amoco Production Research, Tulsa, OK (United States)); Winkler, H.W.

1993-05-01

124

Maximum Acceptable Weight of Lift  

Microsoft Academic Search

This paper discusses the maximum amount of weight that an individual can be expected to lift comfortably and without strain. Recommendations based on empirical estimates, biomechanical techniques, and psychophysical methods are reviewed, including those of the International Labour Office, the Swiss Accident Insurance Institute, the Danish National Association for Infantile Paralysis, and the U. S. Air Force. The approach used

S. H. Snook; C. H. Irvine

1967-01-01

125

Visual perception of lifted weight  

Microsoft Academic Search

The weight of a box can be seen by observing another person lifting and carrying it. Evidence for this phenomenon is provided in 2 experiments, the first of which employed videotaped events with the actor and box visible only as 21 bright patches. Observers (26 25–55 yr old undergraduates and faculty members) judged the weight of the box linearly with

Sverker Runeson; Gunilla Frykholm

1981-01-01

126

Fluid-dynamic lift: Practical information on aerodynamic and hydrodynamic lift  

Microsoft Academic Search

The book represents an extensive compendium of basic engineering data on the aerodynamic and hydrodynamic characteristics of the chief types of lifting surfaces used in aircraft and marine craft. The topics covered include the mechanism of circulation in foil sections, the lift of straight wings, maximum lift and stalling, lift characteristics of plain, split, and slotted trailing-edge flaps, performance of

S. F. Hoerner; H. V. Borst

1975-01-01

127

Project Plan for Vertical Lift Machine  

Microsoft Academic Search

This document describes the Project Plan for the development and manufacture of a Vertical Lift Machine. It is assumed by this project plan that the Vertical Lift Machine will be developed, designed, manufactured, and tested by a qualified vendor. LLNL will retain review and approval authority for each step given in this project plan. The Vertical Lift Machine is a

Ellsworth

2002-01-01

128

Influence of Lift Offset on Rotorcraft Performance  

Microsoft Academic Search

The influence of lift offset on the performance of several rotorcraft configurations is explored. A lift- offset rotor, or advancing blade concept, is a hingeless rotor that can attain good efficiency at high speed, by operating with more lift on the advancing side than on the retreating side of the rotor disk. The calculated performance capability of modern-technology coaxial rotors

Wayne Johnson

129

Hydraulic lift: a potentially important ecosystem process  

Microsoft Academic Search

Hydraulic lift is the process by which some deep-rooted plants take in water from lower soil layers and exude that water into upper, drier soil layers. Hydraulic lift is beneficial to the plant transporting the water, and may be an important water source for neighboring plants. Recent evidence shows that hydraulically lifted water can promote greater plant growth, and could

Jonathan L. Horton; Stephen C. Hart

1998-01-01

130

Insect Flight: Using Drag for Lift  

Microsoft Academic Search

Airplanes and helicopters are airborne via aerodynamic lift, not drag. So is a hovering insect which beats its wing along a horizontal plane. Consequently, a central focus in the studies of flight is the search for steady and unsteady lift enhancement mechanisms. But it is not apriori clear that an insect should use only lift to hover, especially at low

Z. Jane Wang

2002-01-01

131

Backbreaking work. What you need to know about lifting and back safety in EMS.  

PubMed

Geraldine did not look very heavy, but she was wedged between the toilet and bath-tub. She had slipped while getting out of the tub and was complaining of severe hip pain. The room was only big enough for me, my partner and Geraldine, who needed to be lifted up and out of the room to the cot in the hallway. The question at hand was how to keep Geraldine as pain-free as possible while protecting our own backs during the lift and move. Nearly every patient contact involves lifting and carrying equipment and patients, which applies forces that can potentially injure your back. In this article, we explore lifting and back safety for EMS providers. PMID:18814673

Friese, Greg; Owsley, Keith

2008-05-01

132

Prediction of Peak Back Compressive Forces as a Function of Lifting Speed and Compressive Forces at Lift Origin and Destination - A Pilot Study  

PubMed Central

Objectives To determine the feasibility of predicting static and dynamic peak back-compressive forces based on (1) static back compressive force values at the lift origin and destination and (2) lifting speed. Methods Ten male subjects performed symmetric mid-sagittal floor-to-shoulder, floor-to-waist, and waist-to-shoulder lifts at three different speeds (slow, medium, and fast), and with two different loads (light and heavy). Two-dimensional kinematics and kinetics were captured. Linear regression analyses were used to develop prediction equations, the amount of predictability, and significance for static and dynamic peak back-compressive forces based on a static origin and destination average (SODA) back-compressive force. Results Static and dynamic peak back-compressive forces were highly predicted by the SODA, with R2 values ranging from 0.830 to 0.947. Slopes were significantly different between slow and fast lifting speeds (p < 0.05) for the dynamic peak prediction equations. The slope of the regression line for static prediction was significantly greater than one with a significant positive intercept value. Conclusion SODA under-predict both static and dynamic peak back-compressive force values. Peak values are highly predictable and could be readily determined using back-compressive force assessments at the origin and destination of a lifting task. This could be valuable for enhancing job design and analysis in the workplace and for large-scale studies where a full analysis of each lifting task is not feasible.

Greenland, Kasey O; Merryweather, Andrew S

2011-01-01

133

Simultaneous Breast Augmentation and Lift  

Microsoft Academic Search

.   Often, both augmentation and mastopexy are necessary to solve the problems of breast ptosis with hypoplasia. These two procedures\\u000a can be done simultaneously with no increased risks. Patients who have any degree of ptosis may benefit from some lifting of\\u000a the nipple areola complex if the nipple is not in the central portion of the general contour of the

Julie Karnes; Wendy Morrison; Mark Salisbury; Martin Schaeferle; Patrick Beckham; Robert A. Ersek

2000-01-01

134

Allometry of hummingbird lifting performance  

PubMed Central

Vertical lifting performance in 67 hummingbird species was studied across a 4000 m elevational gradient. We used the technique of asymptotic load-lifting to elicit maximum sustained muscle power output during loaded hovering flight. Our analysis incorporated direct measurements of maximum sustained load and simultaneous wingbeat kinematics, together with aerodynamic estimates of mass-specific mechanical power output, all within a robust phylogenetic framework for the Trochilidae. We evaluated key statistical factors relevant to estimating slopes for allometric relationships by performing analyses with and without phylogenetic information, and incorporating species-specific measurement error. We further examined allometric relationships at different elevations because this gradient represents a natural experiment for studying physical challenges to animal flight mechanics. Maximum lifting capacity (i.e. vertical force production) declined with elevation, but was either isometric or negatively allometric with respect to both body and muscle mass, depending on elevational occurrence of the corresponding taxa. Maximum relative muscle power output exhibited a negative allometry with respect to muscle mass, supporting theoretical predictions from muscle mechanics.

Altshuler, D. L.; Dudley, R.; Heredia, S. M.; McGuire, J. A.

2010-01-01

135

Gender differences in lifting technique.  

PubMed

The importance of different motion patterns in the assessment of work technique is rarely addressed in the literature and even less information can be found regarding gender differences. In this study the possible gender differences in lifting technique from lifting experiments on 12 female and 10 male participants were examined. The participants performed squat and stoop lifts of a box. Movements were measured by means of opto-electronic measurement systems. Kinematic data derived from the measurements revealed some differences between the men and the women, e.g. in trunk motion and knee angle ranges. The hip-knee interjoint coordination was more synchronized for women than for men in terms of the relative phase angle. It is concluded that so far gender differences in motion patterns have not been sufficiently explored and that men and women need to be considered separately in the evaluation of work technique in manual handling tasks. Advantages and disadvantages of different coordination patterns need to be further investigated. PMID:11209877

Lindbeck, L; Kjellberg, K

2001-02-10

136

Effects of Injector Conditions on the Flame Lift-Off Length of DI Diesel Sprays  

SciTech Connect

The effects of injection pressure and orifice diameter on the lift-off length of a direct-injection (DI) diesel spray (defined as the farthest upstream location of high temperature combustion) were investigated using a natural light emission imaging technique. The lift-off length experiments were conducted in a constant-volume combustion vessel under quiescent, heavy-duty DI diesel engine conditions using a Phillips research grade No.2 diesel fuel. The results show that natural light emission at 310 nm provides an excellent marker of the lift-off length. At this location, natural light emission at 310 nm is dominated by OH chemiluminescence generated by high-temperature combustion chemistry. Lift-off lengths determined from images of natural light emission at 310 nm show that as either injection pressure (i.e., injection velocity) or orifice diameter increase, the lift-off length increases. The observed lift-off length increase was linearly dependent on injection velocity, the same dependency as previously noted for gas jets. The lift-off length increase with increasing orifice diameter, however, is different than the independence of lift-off length on orifice diameter noted for gas jets An important overall observation was made by considering the lift-off length data in conjunction with data from recent investigations of liquid-phase fuel penetration and spray development. The combined data suggests that a systematic evolution of the relationship and interaction between various processes in a DI diesel spray has been occurring over time, as injection pressures have been increased and orifice diameters reduced as part of efforts to meet emissions regulations. The trends observed may eventually help explain effects of parameters such as injection pressure and orifice diameter on emissions.

D. L. Siebers; B. S. Higgins

2000-07-01

137

Workers' assessments of manual lifting tasks: cognitive strategies and validation with respect to objective indices and musculoskeletal symptoms  

Microsoft Academic Search

ObjectivesTo determine the different cognitive strategies adopted by workers in assessing the effects of lifting-task parameters on effort, and to validate workers' assessments.MethodsQuestionnaires were administered to 217 male workers with varied levels of experience in manual handling. Workers were asked to assess the effects of lifting on perceived effort, using linguistic descriptors (e.g., light, heavy), and to determine the physical

Simon S. Yeung; Ash Genaidy; James Deddens; P. C. Leung

2003-01-01

138

Hydraulic lift: a potentially important ecosystem process.  

PubMed

Hydraulic lift is the process by which some deep-rooted plants take in water from lower soil layers and exude that water into upper, drier soil layers. Hydraulic lift is beneficial to the plant transporting the water, and may be an important water source for neighboring plants. Recent evidence shows that hydraulically lifted water can promote greater plant growth, and could have important implications for net primary productivity, as well as ecosystem nutrient cycling and water balance. PMID:21238277

Horton, J L; Hart, S C

1998-06-01

139

A reactor core barrel lift at Byron  

SciTech Connect

A core barrel lift operation for weld inspection at Byron Nuclear Power Plant Unit 1 is summarized in the article. The lift of the lower reactor internals was accomplished with robots, cameras, and 2 overhead craned operators. Lift time and return time were 35 minutes each, and the total dose received for the job was 87 person-millirem. Similar operations at Wolf Creek and Zion are also very briefly described.

Michal, R.

1996-10-01

140

Occupational Asthma  

PubMed Central

Bronchospasm is a common cause of morbidity in the workplace. More than 100 agents are now recognized as occupational causes of asthma and numerous agents can cause exacerbations of preexisting asthma. Because of the large number of potential causative agents and the complexity of modern industrial processes, knowledge of the characteristic clinical features of occupational asthma is the key to recognizing this disease. Early diagnosis of occupational asthma is important in preventing long-term morbidity. Present evidence that prolonged exposure to some work-encountered agents can cause asthma that persists for years after the end of exposure suggests that avoidance is the only acceptable countermeasure against this disease.

Sheppard, Dean

1982-01-01

141

Artificial lift: Many new developments are emerging  

SciTech Connect

Methods of artificially lifting oil production are almost countless, testifying to the ingenuity of inventors, engineers, technicians, etc., that have worked in this area. And, artificial lift improvements continue to be important, especially now that product prices are nearly constant and production costs are under closer scruitiny. Some methods of artificial lift thought to be new to industry are mentioned in this article, including: Aluminum sucker rods, Graphite composite lift system, Unique pumping unit geometry, Chain drive pumping unit, Two types of pump-off control, Downhole gas pump, Hydraulic-centrifugal pump, Improvements in submersible pumps, and Submersible pump gas separators.

Lea, J.F.

1984-03-01

142

Optimizing production with artificial lift systems  

SciTech Connect

There are four basic artificial lift systems in use today; gas-lift (GL), sucker rod pumping (SRP), electric subsurface centrifugal pumps (ESP), and subsurface hydraulic (SSHP). All of these systems are time proven and will satisfactorily perform the task for which they were designed. Once the factors that will influence the operation of a lift system have been defined, the design engineer must consider the advantages of the basic systems. The more common oil field problems which affect artificial lift are listed. The {ital relative} merits of each system with these problems are noted; however, the severity of any one of the adverse conditions may dictate the optimum system.

Patton, L.D. (Patton and Associates, Aurora, CO (US))

1989-07-01

143

Occupational stress among tunnel workers in Sikkim  

PubMed Central

Background: Job stress has been linked to a wide range of adverse effects on mental, physical and organizational health. Objective: The objective of this study was to determine the impact of job stress on mental, physical and social health of the underground construction workers in Sikkim. Materials and Methods: The study population comprised of tunnel workers and a comparable group of controls. Using the interview technique, data was collected using the SF-36 General Health Survey Questionnaire. Results: The study population comprised of individuals of whom more than half were below 40 years of age and was comparable to the group of controls. Majority reported good health, while poor health was reported by 22 % of the subjects under study Compared to their health status last year, 52% rated their health as somewhat worse. Majority reported that their physical health problems limited them in activities of daily life, viz., running, lifting heavy objects, participation in strenuous sports, climbing several flights of stairs, bending, stooping or kneeling and walking more than a mile, during the past four weeks. More than half of them had severe body ache in the past four weeks that interfered with both work outside home and housework. This was true for emotional problems also, which interfered with their normal social activities involving family, friends, neighbors or groups. The associations of occupational stress with physical, emotional and social life and with limitation of day-to-day activities among tunnel workers were found to be statistically significant. Conclusion: The results emphasize the importance of assessment of the effects of job stress and of fulfilling the need of underground workers for optimum preventive measures.

Basnet, Pragyan; Gurung, Shoyeta; Pal, Ranabir; Kar, Sumit; Bharati, Dharamvir Ranjan

2010-01-01

144

Theoretical basis for general lifting equations based on mechanical work performed during manual lifting  

Microsoft Academic Search

Objective:?The objective of this research is to develop and validate general lifting equations based on the concept of mechanical work performed during the manual handling of objects.Background:?To the authors’ knowledge, the NIOSH lifting equation was based on an empirical approach. Therefore, there is a need for general lifting equations that are based on the laws of mechanics and physics.Methods:?General lifting

S. Abdallah; A. Genaidy; W. Karwowski; R. Shell; A. Sonbol; E. Ravelo; M. B. Holley

2005-01-01

145

The Selection of a Van Lift or a Scooter.  

ERIC Educational Resources Information Center

This newsletter issue describes 3-wheeled scooters and van lifts that can assist a person with a disability to drive independently or have access to transportation. The section on van lifts compares hydraulic lifts and electric lifts, lists manufacturers, and offers an "assessment quiz" outlining factors to consider in selecting a van lift. In the…

Stevens, John H.

1990-01-01

146

Evaluation of lifting tasks frequently performed during fire brick manufacturing processes using NIOSH lifting equations  

Microsoft Academic Search

A fire brick manufacturing company with a high prevalence of low back injuries was selected for analysis of lifting tasks using the 1991 revised NIOSH lifting equations. We analyzed several manufacturing processes: forming, heating and packing processes involving frequent lifting and lowering in asymmetric postures. A questionnaire survey showed that weight of the load significantly influenced the incidence of back

Min K. Chung; Dohyung Kee

2000-01-01

147

Occupational Health  

MedlinePLUS

Occupational health problems occur at work or because of the kind of work you do. These problems can include ... by exposure to radiation Exposure to germs in health care settings Good job safety and prevention practices ...

148

Occupational cancer  

SciTech Connect

Cancer resulting from occupational exposure is now receiving major attention, focusing on identification, regulation, and control of cancer-causing agents. Such cancer can result from exposure to chemicals and ionizing and nonionizing radiation. Extended exposure (often years) and an extended latent period of perhaps decades may intervene before tumor appearance. Although the actual extent of occupational cancer is in debate, estimates have ranged from 4 to 15 per cent of all cancer.

Nelson, N.

1987-07-01

149

PERSONAL IDENTIFICATION USING LIFTING DYADIC WAVELET FILTERS  

Microsoft Academic Search

This paper proposes a new method for identifying persons by multiband lifting dyadic wavelet filters. Our method consists of three procedures as follows: face learning, detection and identification. In the learning procedure, new highpass fil- ters for capturing facial parts are constructed by tuning free parameters in the lifting filters. By using the learned filters for target persons, a face

Shigeru Takano; Koichi Niijima; Koichi Kuzume

150

Families of Lift and Contact Transformations  

Microsoft Academic Search

A study of the contact transformation is carried out, with special emphasis on the lift transformation. The latter is the more basic concept, because it applies to a single curve, rather than to pairs of them, in the first instance. From that viewpoint the lift transformation can also transform an unfamiliar system of partial differential equations to a familiar one,

M. J. Sewell; I. Roulstone

1994-01-01

151

Hydraulic lift in a neotropical savanna  

Microsoft Academic Search

Summary 1. We report hydraulic lift in the sawmlia vegetation of central Brazil (Cerrado). Both heat-pulse measurements and isotopic (deuterium) labelling were used to determine whether hydraulic lift occurred in two common species, and whether neighbouring small shrubs and trees were utilizing this water. 2. Both techniques showed water uptake by tap-roots and reverse flow of water in lateral roots.

M. Z. Moreira; F. G. Scholz; S. J. Bucci; L. S. Sternberg; G. Goldstein; F. C. Meinzer; A. C. Franco

2003-01-01

152

Variations in hydraulic lift with diamond bits  

Microsoft Academic Search

The total pressure beneath natural diamond bits often exceeds 1000 psi. This results in a sizable lifting force on the bit face. The true bottomhole load between the bit and rock can be less than half of the weight-on-bit indicated at the surface. Hydraulic lift is a significant force that must be accounted for in both laboratory and field evaluations

Winters

1982-01-01

153

Soccer Ball Lift Coefficients via Trajectory Analysis  

ERIC Educational Resources Information Center

|We performed experiments in which a soccer ball was launched from a machine while two high-speed cameras recorded portions of the trajectory. Using the trajectory data and published drag coefficients, we extracted lift coefficients for a soccer ball. We determined lift coefficients for a wide range of spin parameters, including several spin…

Goff, John Eric; Carre, Matt J.

2010-01-01

154

Flow Structure of Lifted Swirling Jet Flames  

Microsoft Academic Search

Swirling combustion is widely applied in various applications such as gas turbines, utility boilersor waste incinerators. This article contributes to the ongoing research by providing experimentaldata that are gathered in the mixing zone of a lifted swirling premixed natural gas flame. Theobjective of this paper is fivefold: (1) to introduce the lifted swirling flame featuring lowNOx emissions (2) to provide

K. Vanoverberghe; E. Van den Bulck; M. Tummers

2004-01-01

155

Lift modulation for maximum endurance planetary entry  

Microsoft Academic Search

Optimal lift modulation for maximum endurance planetary entry trajectories of Shuttle type vehicles is investigated. The force field of the planet is considered Newtonian, and the atmosphere is assumed to be exponential. Motion is confined to the plane of a great circle to obtain maximum endurance, and a set of dimensionless variables and a normalized lift coefficient are used to

C.-Y. Yang; J.-S. Chern

1981-01-01

156

UF sub 6 cylinder lifting equipment enhancements  

Microsoft Academic Search

This paper presents numerous enhancements that have been made to the Portsmouth lifting equipment to ensure the safe handling of cylinders containing liquid uranium hexafluoride (UFâ). The basic approach has been to provide redundancy to all components of the lift path so that any one component failure would not cause the load to drop or cause any undesirable movement. 4

Hortel

1991-01-01

157

Dynamic Lifting Motion of Humanoid Robots  

Microsoft Academic Search

This paper describes a motion generation method for dynamic lifting by a humanoid robot. The proposed technique suggests the possibility of taking advantage of the whole body motion in order to facilitate the lifting movement. In particular, the idea is to perform a preliminary motion in order to generate a momentum which is instantaneously transferred to the object as an

Hitoshi Arisumi; Jean-rémy Chardonnet; Abderrahmane Kheddar; Kazuhito Yokoi

2007-01-01

158

Soccer Ball Lift Coefficients via Trajectory Analysis  

ERIC Educational Resources Information Center

We performed experiments in which a soccer ball was launched from a machine while two high-speed cameras recorded portions of the trajectory. Using the trajectory data and published drag coefficients, we extracted lift coefficients for a soccer ball. We determined lift coefficients for a wide range of spin parameters, including several spin…

Goff, John Eric; Carre, Matt J.

2010-01-01

159

Principal component analysis of lifting waveforms  

Microsoft Academic Search

Background. One limiting factor in lifting research design has been the inability to effectively analyze waveform data, especially when differences in body mass, height, and load magnitude influence the derived kinetic variables. The purpose of this study was to demon- strate the sensitivity of principal component analysis to quantify clinically relevant differences in kinetic lifting waveforms over three load magnitudes

Allan T. Wrigley; Wayne J. Albert; Kevin J. Deluzio; Joan M. Stevenson

2006-01-01

160

Lambda Lifting: Treansforming Programs to Recursive Equations  

Microsoft Academic Search

Lambda lifting is a technique for transforming a functional program with local function definitions, possibly with free variables in the function definitions, into a program consisting only of global function (combinator) definitions which will be used as rewrite rules. Different ways of doing lambda lifting are presented, as well as reasons for rejecting or selecting the method used in our

Thomas Johnsson

1985-01-01

161

Gas lift systems make ideal offshore workers  

SciTech Connect

With a low initial installation cost and small footprint, gas lift systems are well suited for offshore installations where compressed gas is usually already available. These systems are used on multiple and slimhole completions and handle sandy conditions well. They are also used to kick off wells that will flow naturally once the heavier completion fluids leave the production string. Gas lift itself is a mature workaday technology. Measurement and control of gas flow is an area of intense development in gas lift technology. One new control method involves production of multiple completions through a single wellbore. Typically, gas lift valves are opened and closed through tubing pressure. But downhole measurement technology does not yet yield information good enough for stable gas lift control of multiple completions. Gas lift is proving to be a useful AL technique in conjunction with electric submersible pumps (ESP). Located above the ESP pump, the gas lift can reduce the head and allow greater flow. This is helpful when small casing restricts the size of the downhole ESP pump. Wells can usually be produced by the gas lift alone in case of ESP failure, or by replacing the ESP where schedules, high repair costs or low prices rule out repair.

NONE

1999-05-01

162

Lambda lifting: Transforming programs to recursive equations  

Microsoft Academic Search

Lambda lifting is a technique for transforming a functional program with local function definitions, possibly with free variables in the function definitions, into a program consisting only of global function (combinator) definitions which will be used as rewrite rules. Different ways of doing lambda lifting are presented, as well as reasons for rejecting or selecting the method used in our

Thomas Johnsson

163

Lifting Ball Valve for Cryogenic Fluid Applications.  

National Technical Information Service (NTIS)

Marotta Scientific Controls, Inc. has designed a Lifting Ball Valve (LBV) capable of both flow modulation and tight shutoff for cryogenic and other applications. The LBV features a thin-walled visor valving element that lifts off the seal with near axial ...

J. M. Cardin R. H. Reinicke S. D. Bruneau

1993-01-01

164

9. VIEW LOOKING SOUTHWEST SHOWING TOP OF LIFT SPAN AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. VIEW LOOKING SOUTHWEST SHOWING TOP OF LIFT SPAN AND MACHINERY HOUSE; ADJACENT RAILROAD LIFT-BRIDGE TO THE RIGHT. - Carter Road Lift Bridge, Spanning Cuyahoga River at Carter Road, Cleveland, Cuyahoga County, OH

165

View north; detail of lifting points at south end of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View north; detail of lifting points at south end of lift span. - Naval Base Philadelphia-Philadelphia Naval Shipyard, Lift Bridge, Mouth of Reserve Basin, League Island, Philadelphia, Philadelphia County, PA

166

14 CFR 25.697 - Lift and drag devices, controls.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Lift and drag devices, controls...TRANSPORT CATEGORY AIRPLANES Design and Construction...25.697 Lift and drag devices, controls...improbable. Lift and drag devices intended for...engine power, and airplane attitude....

2010-01-01

167

14 CFR 25.697 - Lift and drag devices, controls.  

Code of Federal Regulations, 2010 CFR

...2009-01-01 false Lift and drag devices, controls...TRANSPORT CATEGORY AIRPLANES Design and Construction...25.697 Lift and drag devices, controls...improbable. Lift and drag devices intended for...engine power, and airplane attitude....

2009-01-01

168

Risk factors for lower back injury in male dancers performing ballet lifts.  

PubMed

Lower back injuries are common in ballet dancers. Allegedly there is a higher incidence in males than in females due to their lifting requirements. This study analyzes the estimated forces generated at the L5/S1 joint in five professional and three pre-professional male dancers performing full press (FP) and arabesque (AR) ballet lifts. The estimated peak lumbar anterior shear force (PLASF) was identified using a 3D motion analysis system, and was found to occur at the beginning of each lift, approximately 0.01 seconds prior to the ballerina moving vertically into the lift. Data representing the male dancers' posture at the point of PLASF were input into a 3D Static Strength Prediction Program (3DSSPP, University of Michigan, Centre for Ergonomics, 2006) to calculate the PLASF and corresponding compression forces. The compression forces identified in this way were found to be greater than the National Institute of Occupational Safety and Health, Back Compression Design Limit (3400N). This suggests that administrative controls such as monitoring the number of lifts performed daily are required to reduce the risk of lower back injury in male dancers. Comparison of the two lifts found significantly (p < 0.05) higher compression forces in the FP versus the AR lift. This could be attributed to a significantly (p < 0.05) larger horizontal distance between the male dancer and the ballerina, or the eccentric loading of the male dancers' lower limb and trunk musculature in the preparation phase of the FP. Retrospective regression analysis indicated that peak trunk extension velocity and the horizontal distance between the male dancer and the ballerina were significant (p < 0.05) predictors of PLASF. PMID:19754984

Alderson, Jacqueline; Hopper, Luke; Elliott, Bruce; Ackland, Tim

2009-01-01

169

What's new in artificial lift  

SciTech Connect

New developments might be expected to decline as oil, and thus equipment and service, prices decrease. However, there is no indication that this is occurring. In fact, several new and innovative developments are covered in this article. Of the more unique are a new geometry pumping unit and a hydraulic powered sucker and rod system. Other items described in this article include: New pump-off controller; Automatic balancing for air balanced pumping units; New rod couplings; New pump plunger; Sucker rod pulsation dampener; Stripper type BOP; Rod coupling tool; ESP cable protectors; New ESP motor; VSD communications interface; ESP gas separator; Portable hydraulic production test unit; Casing gas lift plunger; Production shut-of valve; Ceramic material for pump parts; Pressure transmitter; and New versatile packer.

Lea, J.F.; Winker, H.W.

1989-05-01

170

We once had a heavy-lift launcher  

NASA Astrophysics Data System (ADS)

A personal insight into the history of the Saturn V launch vehicle and subsequent space activities is presented. The work environment and what has changed to make it more difficult are explored. It is concluded that the Apollo Program could not be done in the same time frame today. A few thoughts of what could be done to reestablish that capability are given.

Smith, Richard G.

1990-09-01

171

Shuttle C: Heavy-lift vehicle of the 1990's  

NASA Astrophysics Data System (ADS)

The unmanned, Shuttle-C, a low cost evolution of the U.S. Space Shuttle is described. It is capable of delivering 45,400 to 77,100 kg payloads by 1994. The Shuttle-C's design is evolved directly from the Space Shuttle. The payload carrier, the only new element of the Shuttle-C, is a cylindrical payload bay 4.6 m in diameter by 25 m in length. Diagrams of similarities and differences betwen the Shuttle and Shuttle-C are presented. A typical mission profile is illustrated. Payload carrying abilities and other applications are described.

Lee, Thomas J.

1989-08-01

172

Assessment of Navy Heavy-Lift Aircraft Options.  

National Technical Information Service (NTIS)

Helicopters have gradually become able to carry more and heavier cargo, including vehicles. An aircraft that could carry even more than today's helicopters might be especially valuable when access to on-shore facilities is limited and working from shipboa...

J. Gordon P. A. Wilson J. Grossman D. Deamon M. Edwards

2005-01-01

173

OCCUPATIONAL CANCERS  

Microsoft Academic Search

Environmental factors play a big role in the formation of cancer. According to what we know today, 80% of cases of cancer are caused by the effects of environmental factors. Included among the environmental factors are those that can be found in the workplace and occupational factors. The first comprehensive investigation in this field was conducted by R. Doll and

Nazmi Bilir

174

Technical considerations in endoscopic brow lift.  

PubMed

The authors discuss how, in performing an endoscopic brow lift, meticulous surgical technique, adherence to anatomic dissection planes, and direct visualization used at key points in the procedure enable a safer, more-complete dissection and a better outcome. Anatomy as it relates to the procedure is discussed. Patient evaluation and patient expectations are reviewed with a discussion of the points to present to patients about outcomes of this surgery. Detailed steps of the endoscopic brow-lift technique are presented. Complications are discussed and the authors conclude with a summarization of what the ideal brow-lift procedure would accomplish. PMID:23186760

Terella, Adam M; Wang, Tom D

2012-08-27

175

The varied options in brow lifting.  

PubMed

Numerous options in brow lifting exist that can be broadly categorized as open and minimally invasive or endoscopic. Proper patient evaluation, procedural goals, and surgeon preference all play into procedure choice. There are common desirable traits of the esthetic brow. One must take into account gender differences when considering alteration of the brow. Multiple options exist for brow fixation. One must take into account 3 factors during brow lift: release of the brow, brow fixation after advancement, and depressor muscle release. A brow lift will affect the amount of excess upper lid skin and pretarsal lid show. PMID:23186759

Nahai, Farzad R

2012-10-23

176

Calculating the Lifting Condensation Level (LCL)  

NSDL National Science Digital Library

This Javascript calculator was designed to calculate lifting condensation level (LCL) conditions using only three atmospheric input parameters that are commonly measured and reported during most local televised weather forecasts: surface temperature, surface dewpoint, and surface pressure. Output is pressure and parcel temperature at LCL. Though this calculator was designed to calculate the lifting condensation level for a parcel of air lifted from the surface, you calculate the LCL conditions for an air parcel at any other pressure level by substituting values appropriately. There is also a link to a calculator that will convert temperature reading from Celsius to Fahrenheit to Kelvin units.

1996-01-01

177

Optimal Lifting Techniques Adopted by Chinese Men when Determining Their Maximum Acceptable Weight of Lift  

Microsoft Academic Search

The purpose of this study was to identify biomechanically the mechanisms adopted by Chinese men when they psychophysically determined their MAWLs (maximum acceptable weights of lift) in different tasks. Twenty-two healthy Chinese men determined their MAWLs at two lifting vertical ranges and three lifting frequencies. Peak L5\\/S1 compressive forces, elbow and shoulder peak reactive moments, acceleration effects, and postures were

Yi-Lang Chen

2000-01-01

178

Lifting Surface Theory for Statically Operating Propellers.  

National Technical Information Service (NTIS)

A method was derived and a computer program formulated which utilizes a vortex-lattice lifting surface representation to model a statically operating propeller and to compute its performance. The computer program has been written to yield propeller perfor...

F. O. Carta J. C. Murray

1972-01-01

179

Epidemiological Basis for Manual Lifting Guidelines.  

National Technical Information Service (NTIS)

The review discussed various aspects of guidelines for safe manual lifting. Specific topics covered in the report included low back pain, impairment, disability and compensation; causes of low back pain; comparative analysis of risk factors, age, gender, ...

A. Garg

1989-01-01

180

Lift Coefficient of Randomly Oscillating Hydroplane.  

National Technical Information Service (NTIS)

This report describes the measurement of lift on a randomly oscillating hydroplane and makes a comparison between oscillating the hydroplane randomly or with regular sinusoidal signals together with the different methods of analysis.

M. J. Smith

1991-01-01

181

The Biomechanics of Lifting and Materials Handling.  

National Technical Information Service (NTIS)

Musculoskeletal responses elicited by static lifting were investigated. Kinesiometers were constructed capable of measuring postural changes during standing and seated tasks and which automatically computed cartesian coordinates of anatomical landmarks of...

E. R. Tichauer S. Elbaum F. Glickman C. Gold C. Tauber

1981-01-01

182

49 CFR 37.203 - Lift maintenance.  

Code of Federal Regulations, 2011 CFR

...203 Transportation Office of the Secretary of Transportation TRANSPORTATION SERVICES FOR INDIVIDUALS WITH DISABILITIES (ADA) Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall establish a system of...

2011-10-01

183

49 CFR 37.203 - Lift maintenance.  

Code of Federal Regulations, 2012 CFR

...203 Transportation Office of the Secretary of Transportation TRANSPORTATION...INDIVIDUALS WITH DISABILITIES (ADA) Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall establish a...

2012-10-01

184

14 CFR 25.697 - Lift and drag devices, controls.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Lift and drag devices, controls. 25.697 Section...Control Systems § 25.697 Lift and drag devices, controls. (a) Each lift...established under § 25.101(d). Lift and drag devices must maintain the selected...

2013-01-01

185

33 CFR 118.85 - Lights on vertical lift bridges.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Lights on vertical lift bridges. 118.85 Section 118.85 Navigation...AND OTHER SIGNALS § 118.85 Lights on vertical lift bridges. (a) Lift span lights. The vertical lift span of every...

2009-07-01

186

33 CFR 118.85 - Lights on vertical lift bridges.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Lights on vertical lift bridges. 118.85 Section 118.85 Navigation...AND OTHER SIGNALS § 118.85 Lights on vertical lift bridges. (a) Lift span lights. The vertical lift span of every...

2010-07-01

187

VLSI architecture of wavelet transform based on basic lifting elements  

NASA Astrophysics Data System (ADS)

In this paper, we propose a lifting architecture based on a basic lifting unit, whose structure performs lifting operations in a repetitive way. By analyzing computational processes in lifting in detail, the reusable Basic Lifting Element (BLE) is presented. The BLE structure is designed and optimized from the viewpoint of hardware implementation. The proposed lifting processor can be executed by arranging BLEs repeatedly. Experimental results show that the proposed architecture can transform any size of tiles with 9/7 filter and 5/3 filter for lossy and lossless compression, respectively. The lifting processor is designed in Verilog HDL and synthesized into Xilinx FPGA, which can run up to 130MHz.

Guo, Jie; Li, Yunsong; Wang, Keyan; Wu, Chengke

2009-08-01

188

Occupational asthma.  

PubMed Central

Occupational asthma is probably much more common than is generally realized. Though many causes have been described, undoubtedly many more are yet to be recognized. One of the diagnostic difficulties lies in the fact that in most forms of this disease a late asthmatic reaction occurs in the evening rather than at work. The pathogenetic mechanisms differ in various forms of occupational asthma. In some, an immunologic mechanism is likely; in others, a "pharmacologic" action of the offending agent is implicated. Asthma due to inhalation of dusts of western red cedar, isocyanates, detergent enzymes and textiles is considered in detail. Periodic examination of workers at risk is of value for early diagnosis and prevention of irrversible airway obstruction.

Chan-Yeung, M.; Grzybowski, S.

1976-01-01

189

Aerodynamic Characteristics of a Large-Scale Lift-Engine Fighter Model with External Swiveling Lift-Engines.  

National Technical Information Service (NTIS)

The aerodynamic characteristics of a six-engine (four lift, two lift-cruise) lift-engine model obtained in the Ames 40- by 80-foot wind tunnel are presented. The model was an approximate one-half scale representation of a lift-engine VTOL fighter aircraft...

J. P. Barrack J. V. Kirk

1972-01-01

190

Biomechanical assessment of lifting dynamics, muscle activity and spinal loads while using three different styles of lifting belt  

Microsoft Academic Search

Objective. To demonstrate the influence of different types of lifting belts on trunk motion, muscle activity and spine loading during symmetric and asymmetric lifting exertions.Design, In vivo measurements were achieved representing lifting dynamics, applied trunk moments and myoelectric activity. Dynamic spinal loads were determined from a validated biomechanical model of lifting.Background. There is a great deal of controversy as to

K. P. Granata; W. S. Marras; K. G. Davis

1997-01-01

191

Occupational Orientation: Health Occupations. Experimental Curriculum Materials.  

ERIC Educational Resources Information Center

These experimental curriculum materials for one of five clusters developed for the occupational program in Illinois include a series of learning activity packages (LAPs) designed to acquaint the student with the wide range of occupational choices available in the health occupations field. The 28 LAPs, each with a different occupation focus, are…

Illinois State Office of Education, Springfield.

192

Force requirements of observed object lifting are encoded by the observer's motor system: a TMS study.  

PubMed

Several transcranial magnetic stimulation (TMS) studies have reported facilitation of the primary motor cortex (M1) during the mere observation of actions. This facilitation was shown to be highly congruent, in terms of somatotopy, with the observed action, even at the level of single muscles. With the present study, we investigated whether this muscle-specific facilitation of the observer's motor system reflects the degree of muscular force that is exerted in an observed action. Two separate TMS experiments are reported in which corticospinal excitability was measured in the hand area of M1 while subjects observed the lifting of objects of different weights. The type of action 'grasping-and-lifting-the-object' was always identical, but the grip force varied according to the object's weight. In accordance to previous findings, excitability of M1 was shown to modulate in a muscle-specific way, such that only the cortical representation areas in M1 that control the specific muscles used in the observed lifting action became increasingly facilitated. Moreover, muscle-specific M1 facilitation was shown to modulate to the force requirements of the observed actions, such that M1 excitability was considerably higher when observing heavy object lifting compared with light object lifting. Overall, these results indicate that different levels of observed grip force are mirrored onto the observer's motor system in a highly muscle-specific manner. The measured force-dependent modulations of corticospinal excitability in M1 are hypothesized to be functionally relevant for scaling the observed grip force in the observer's own motor system. In turn, this mechanism may contribute, at least partly, to the observer's ability to infer the weight of the lifted object. PMID:20377627

Alaerts, Kaat; Senot, Patrice; Swinnen, Stephan P; Craighero, Laila; Wenderoth, Nicole; Fadiga, Luciano

2010-03-01

193

Insect Flight: Using Drag for Lift  

NASA Astrophysics Data System (ADS)

Airplanes and helicopters are airborne via aerodynamic lift, not drag. So is a hovering insect which beats its wing along a horizontal plane. Consequently, a central focus in the studies of flight is the search for steady and unsteady lift enhancement mechanisms. But it is not apriori clear that an insect should use only lift to hover, especially at low Reynolds numbers where lift and drag are of comparable magnitude. Here I show that a dragonfly, which employs asymmetric strokes along an inclined stroke plane, effectively uses drag to stay aloft. This not only explains the oddity of dragonfly strokes, but also offers a method for creating downward jets of varying widths and speeds, thereby reducing the undesirable horizontal oscillation during hovering. I further suggest that the more familiar symmetric strokes, such as a figure of eight, can be viewed, conceptually, as pairs of dragonfly strokes. Thus most insects can also exploit drag for lift, which highlights an important difference between an insect and a helicopter.

Wang, Z. Jane

2002-11-01

194

Measuring Lift with the Wright Airfoils  

NASA Astrophysics Data System (ADS)

In this laboratory or demonstration exercise, we mount a small airfoil with its long axis vertical at one end of a nearly frictionless rotating platform.1 Air from a leaf blower2 produces a sidewise lift force L on the airfoil and a drag force D in the direction of the air flow (Fig. 1). The rotating platform is kept in equilibrium by adding weights (the measured values of L) to the lower end of a string passing over a pulley and connected to the other end of the rotating platform (Fig. 2). Our homemade airfoils are similar to those tested by the Wright brothers in 1901. From our lift plots in Fig. 3, we can draw the same conclusions as the Wrights about the influence of an airfoil's curvature and shape on lift.

Heavers, Richard M.; Soleymanloo, Arianne

2011-11-01

195

Frequency response of lift control in Drosophila  

PubMed Central

The flight control responses of the fruitfly represent a powerful model system to explore neuromotor control mechanisms, whose system level control properties can be suitably characterized with a frequency response analysis. We characterized the lift response dynamics of tethered flying Drosophila in presence of vertically oscillating visual patterns, whose oscillation frequency we varied between 0.1 and 13 Hz. We justified these measurements by showing that the amplitude gain and phase response is invariant to the pattern oscillation amplitude and spatial frequency within a broad dynamic range. We also showed that lift responses are largely linear and time invariant (LTI), a necessary condition for a meaningful analysis of frequency responses and a remarkable characteristic given its nonlinear constituents. The flies responded to increasing oscillation frequencies with a roughly linear decrease in response gain, which dropped to background noise levels at about 6 Hz. The phase lag decreased linearly, consistent with a constant reaction delay of 75 ms. Next, we estimated the free-flight response of the fly to generate a Bode diagram of the lift response. The limitation of lift control to frequencies below 6 Hz is explained with inertial body damping, which becomes dominant at higher frequencies. Our work provides the detailed background and techniques that allow optomotor lift responses of Drosophila to be measured with comparatively simple, affordable and commercially available techniques. The identification of an LTI, pattern velocity dependent, lift control strategy is relevant to the underlying motion computation mechanisms and serves a broader understanding of insects' flight control strategies. The relevance and potential pitfalls of applying system identification techniques in tethered preparations is discussed.

Graetzel, Chauncey F.; Nelson, Bradley J.; Fry, Steven N.

2010-01-01

196

Heavy Equipment. Trade and Industrial Education Trade Preparatory Training Guide.  

ERIC Educational Resources Information Center

One of a series of curriculum guides prepared for the building occupations cluster of the construction/fabrication occupational group, this guide identifies the essentials of the heavy equipment trade as recommended by the successful heavy equipment operator. An instructional program based upon the implementation of the guide is expected to…

Nebraska State Dept. of Education, Lincoln. Div. of Vocational Education.

197

Soccer ball lift coefficients via trajectory analysis  

NASA Astrophysics Data System (ADS)

We performed experiments in which a soccer ball was launched from a machine while two high-speed cameras recorded portions of the trajectory. Using the trajectory data and published drag coefficients, we extracted lift coefficients for a soccer ball. We determined lift coefficients for a wide range of spin parameters, including several spin parameters that have not been obtained by today's wind tunnels. Our trajectory analysis technique is not only a valuable tool for professional sports scientists, it is also accessible to students with a background in undergraduate-level classical mechanics.

Goff, John Eric; Carré, Matt J.

2010-07-01

198

Gasless laparoscopy using a planar lifting technique.  

PubMed

In clinical use, the mechanical lifting technique has demonstrated the ability to displace the abdominal wall and create a useful cavity for visualization and surgical manipulation. By forming a planar ceiling, as opposed to the domed ceiling of conventional pneumoperitoneum, the abdominal organs are brought into closer proximity of the surgeon. Instrument length may be shortened, imparting greater surgical control. Without the necessity for gas sealing, entry portals are simplified. Conventional instruments (right angle clamps) may be introduced through the fan retractor insertion sites or by way of separate stab incisions. The planar lifting technique has the potential for simplifying laparoscopy and restoring instrument control to the operating surgeon. PMID:8149041

Chin, A K; Eaton, J; Tsoi, E K; Smith, R S; Fry, W R; Henderson, V J; McColl, M B; Moll, F H; Organ, C H

1994-04-01

199

The evaluation of team lifting on physical work demands and workload in ironworkers.  

PubMed

Lifting and carrying heavy loads occur frequently among ironworkers and result in high prevalence and incidence rates of low back complaints, injuries and work-disability. From a health perspective, little information is available on the effect of team lifting on work demands and workload. Therefore, the objective of this study was to compare the effects of team lifting of maximally 50 kg by two ironworkers (T50) with team lifting of maximally 100 kg by four ironworkers (T100). This study combined a field and laboratory study with the following outcome measures: duration and frequency of tasks and activities, energetic workload, perceived discomfort and maximal compression forces (Fc peak) on the low back. The physical work demands and workload of an individual iron worker during manual handling of rebar materials of 100 kg with four workers did not differ from the manual handling of rebar materials of 50 kg with two workers, with the exception of low back discomfort and Fc peak. The biomechanical workload of the low back exceeded for both T50 and T100 the NIOSH threshold limit of 3400N. Therefore, mechanical transport or other effective design solutions should be considered to reduce the biomechanical workload of the low back and the accompanying health risks among iron workers. PMID:22317295

van der Molen, Henk F; Visser, Steven; Kuijer, P Paul F M; Faber, Gert; Hoozemans, Marco J M; van Dieën, Jaap H; Frings-Dresen, Monique H W

2012-01-01

200

Drag and lift forces on a counter-rotating cylinder in rotating shear flow  

NASA Astrophysics Data System (ADS)

We experimentally investigated the motion of a heavy cylinder in a drum filled with water, and rotating about a horizontal axis. The cylinder either co-rotates or counter-rotates with the rotating drum. The flow field around the cylinder, both for co-rotation and counter-rotation situations, was measured with Particle Image Velocimetry in order to investigate the different flow mechanism. For the counter-rotation situation, the cylinder freely rotates without contact with the wall of the drum, due to the lift force acting on it. The drag and lift coefficients, on the freely counter-rotating cylinder, were measured in a wide range of Reynolds numbers 2,500 < Re < 25,000 and dimensionless rotation rates 0.0 < ? < 1.2. We found that the drag coefficient is consistent with previous measurements on a cylinder in a uniform flow. However, a significant enhancement of the lift coefficient is observed in the present measurements. We expect the enhancement of the lift force is caused by the combined effects of rotation of the cylinder and the vicinity of a wall.

Sun, Chao; Mullin, Tom; van Wijngaarden, Leen; Lohse, Detlef

2009-11-01

201

Occupational asthma.  

PubMed Central

Occupational asthma is important both as a potentially curable and preventable cause of asthma and as a model of adult onset asthma. It is induced by sensitization to a specific agent inhaled at work; for many of its causes, including inhaled proteins and the low molecular weight chemicals acid anhydrides and reactive dyes, it is probably IgE dependent. The risk of developing specific IgE and associated asthma is markedly increased in cigarette smokers, probably as a consequence of non-specific damage to the respiratory mucosa. Asthma caused by several agents, which include some of its most frequent causes, isocyanates, colophony and plicatic acid (Western Red Cedar) persists in some 50% of cases for years, and possibly indefinitely, after avoidance of exposure. The development of chronic symptomatic asthma seems particularly to occur in those with longer duration of symptomatic exposure.

Newman Taylor, A. J.

1988-01-01

202

Occupational asthma.  

PubMed Central

Many toxic compounds found in air emissions may induce bronchoconstriction. In the workplace, workers are exposed to these compounds, often in much higher concentrations. Some of these compounds act as sensitizers. Of these, some compounds induce asthma by producing specific IgE antibodies to the compound or its protein conjugate, while others induce asthma through yet unidentified immunologic mechanisms. Some compounds, when inhaled in high concentrations, act as irritants and produce bronchoconstriction probably by inducing acute airway inflammation. The latter condition is called Reactive Airways Dysfunction Syndrome (RADS) or irritant-induced asthma. Occupational asthma is an excellent model to study the pathogenesis and the natural history of adult onset asthma because the responsible agent can be identified, complete avoidance is possible, and exposure can be measured or estimated.

Chan-Yeung, M

1995-01-01

203

Occupational Classification System Manual  

NSDL National Science Digital Library

Researchers may gain insight into the Bureau of Labor Statistics and Census Bureau occupational codes via the Occupational Classification System Manual (OCSM). A list of Major Occupation Group titles (MOGs) is provided as well as links to the Census Occupation Index--an alphabetical list of approximately 30,000 occupational titles. Further guidance in locating the proper occupation classification for research queries is outlined in the articles "Using the OCSM" and "Using the Census Index."

204

2. DETAIL OF CONTROL GATE ADJACENT TO LIFT LOCK NO. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. DETAIL OF CONTROL GATE ADJACENT TO LIFT LOCK NO. 7; THIS CONTROL GATE IS A 1980s RECONSTRUCTION. - Illinois & Michigan Canal, Lift Lock No. 7 & Control Gate, East side of DuPage River, Channahon, Will County, IL

205

Lifting Surface Theory for Wing-Fuselage Combinations.  

National Technical Information Service (NTIS)

A lifting-surface method has been developed that accounts for the presence of the fuselage. Wing and fuselage chordwise and spanwise loadings and moments are determined. Also, aerodynamic-center location and overall lift and moment coefficients are calcul...

J. P. Giesing

1968-01-01

206

NASA Dryden Fact Sheet - HL-10 Lifting Body  

NASA Website

HL-10 Lifting Body Project Summary Edwards, Calif., from July 1966 to November 1975 to study and validate the concept of safely maneuvering and landing a low lift-over-drag vehicle designed for reentry from space.

207

6. DETAIL VIEW OF 210' 9' LIFT SPAN TOWER SHEAVES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. DETAIL VIEW OF 210' 9' LIFT SPAN TOWER SHEAVES AND BEARINGS WITH HOUSING AND SHEAVE HOODS REMOVED - Central Railroad of New Jersey, Newark Bay Lift Bridge, Spanning Newark Bay, Newark, Essex County, NJ

208

39. DETAIL AERIAL VIEW LOOKING AT 210' 9' LIFT SPAN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

39. DETAIL AERIAL VIEW LOOKING AT 210' 9' LIFT SPAN TOWER SHEAVES SHOWING 1 SET WITH AND 1 SET WITHOUT SHEAVE HOODS - Central Railroad of New Jersey, Newark Bay Lift Bridge, Spanning Newark Bay, Newark, Essex County, NJ

209

3. GENERAL VIEW LOOKING WEST, SHOWING LIFT BRIDGE. COUNTER WEIGHTS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. GENERAL VIEW LOOKING WEST, SHOWING LIFT BRIDGE. COUNTER WEIGHTS ARE LARGE SQUARES VISIBLE ABOVE BRIDGE. - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

210

2. AERIAL VIEW OF ROLLING LIFT BRIDGE. DORCHESTER AVENUE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. AERIAL VIEW OF ROLLING LIFT BRIDGE. DORCHESTER AVENUE IN BACKGROUND. SOUTH STATION VISIBLE AT TOP LEFT. - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

211

GENERAL VIEW LOOKING WEST SHOWING LIFT BRIDGE. COUNTER WEIGHTS ARE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW LOOKING WEST SHOWING LIFT BRIDGE. COUNTER WEIGHTS ARE LARGE SQUARES VISIBLE ABOVE BRIDGE - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

212

1. VIEW OF LIFT STATION (#1774), AND SHED (#1775) BEYOND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW OF LIFT STATION (#1774), AND SHED (#1775) BEYOND AT LEFT, LOOKING SOUTHWEST - Presidio Water Treatment Plant, Lift Station, East of Lobos Creek at Baker Beach, San Francisco, San Francisco County, CA

213

View of lifting girder and tower support superstructure on Tensaw ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of lifting girder and tower support superstructure on Tensaw River Bridge truss No. 2, looking northwest. Showing rope connectors and deflector sheaves. - Tensaw River Lift Bridge, Spanning Tensaw River at U.S. Highway 90, Mobile, Mobile County, AL

214

6. DETAIL OF VERTICAL LIFT SPAN AND FIXED SPAN IMMEDIATELY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. DETAIL OF VERTICAL LIFT SPAN AND FIXED SPAN IMMEDIATELY NORTH OF VERTICAL LIFT SPAN, LOOKING SOUTHEAST. - Shippingsport Bridge, Spanning Illinois River at State Route 51, La Salle, La Salle County, IL

215

Interior view of eastern lift span, with decking above, looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view of eastern lift span, with decking above, looking back from center of span, toward lift mechanism area. - Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memorial & Arlington National Cemetery, Washington, District of Columbia, DC

216

Lift Hysteresis of an Oscillating Slender Ellipse.  

National Technical Information Service (NTIS)

A theoretical investigation has been made to determine the variation of lift with time on a slender elliptic cylinder oscillating in pitch. The development of the unsteady two-dimensional laminar boundary layer over the surfaces of the pitching ellipse is...

W. D. Johnson J. C. Williams

1977-01-01

217

Double lift longwalling in thick Japanese seam  

SciTech Connect

A description of the capacity, seams, and mining methods of the Mitsui Miike coal mine, Japan's largest mine, is presented. The mine yields 5.2 million metric tons of coal, about 25% of Japan's domestic production. The mine utilizes a simultaneous double lift type slicing method on its main seam, which has an average thickness of 16.5 ft.

Not Available

1983-08-01

218

Lifting Surface Theory for Thrust Augmenting Ejectors.  

National Technical Information Service (NTIS)

The circulation theory of airfoil lift has been applied to predict the static performance of thrust augmenting ejectors. The ejector shroud is considered to be 'flying' in the velocity field induced by the entrainment of the primary jets, so that the thru...

P. M. Bevilaqua

1982-01-01

219

Endoscopic forehead lift: The subperiosteal pulling stitch  

Microsoft Academic Search

The endoscopic-assisted forehead lift has overtaken the coronal approach since 1992. One of the controversial points was the fixation of the flap in the elevated position. This article presents a simple pulling stitch using resorbable thread, subperiosteally. The mobile forehead after muscle resection is tracted up and back and fixed to the attached periosteum of the occipital bone. This fixation

Guy-Henri Muller

1996-01-01

220

Measuring Lift with the Wright Airfoils  

Microsoft Academic Search

In this laboratory or demonstration exercise, we mount a small airfoil with its long axis vertical at one end of a nearly frictionless rotating platform.1 Air from a leaf blower2 produces a sidewise lift force L on the airfoil and a drag force D in the direction of the air flow (Fig. 1). The rotating platform is kept in equilibrium

Richard M. Heavers; Arianne Soleymanloo

2011-01-01

221

Lifting costs shaved in Sadler West Unit  

Microsoft Academic Search

Cenard Oil and Gas Co. has cut the lifting cost of fluids in its Sadler West (Penn) Unit near Gainesville, Tex., to less than 2 cents\\/bbl. Volume of produced fluid increased rapidly about one yr after a waterflood was started in the unit. A 3-well hydraulic system was installed to learn if this method could handle the extra production. Murphy

R. Brown; H. Palmour

1968-01-01

222

Hydraulic lift systems with piston type pump  

Microsoft Academic Search

More difficult conditions of oil production process in recent years impose the necessity of finding out new technical solutions that will provide reliable and efficient lifting of reservoir fluid to the surface.Technical solution presented in this paper, hydraulically driven piston pump, is one of the attempts in the field of artificial exploitation methods, to find a solution that will work

Veselin Batalovi?; Dušan Danilovi?; Vesna Karovic Maricic

2011-01-01

223

Hydraulic lift can solve many production problems  

Microsoft Academic Search

For over five decades, hydraulic pumping systems have offered creative solutions for operators faced with a wide array of producing problems. Today, the well-developed and proven capabilities of this lift method continue to provide innovative approaches in dealing with oil well production, testing and evaluation requirements. The performance characteristics of the system give it unique adaptability to a wide range

1990-01-01

224

Gas lift system for marine drilling riser  

Microsoft Academic Search

An offshore drilling method and apparatus are described which prevent formation fracture caused by excessive hydrostatic pressure in a drilling riser. Gas is injected into the riser to provide the lift necessary to return the drilling fluid to the surface and to reduce the density of the drilling fluid. The rate of gas injection overlifts the drilling fluid to the

Maus

1978-01-01

225

DWPF Air Lift Pump Life Cycle Evaluation  

Microsoft Academic Search

The Defense Waste Processing Facility (DWPF) air lift pump was successfully tested at Clemson for 72 days of operation. It provided sufficient flow to pump molten glass without excessive foaming. Slurry feeding also did not reveal any problems with cold cap stability. Metallurgically the Inconel 690 (690) portions of the pump were in excellent condition with no visual evidence of

2004-01-01

226

Measuring Lift with the Wright Airfoils  

ERIC Educational Resources Information Center

|In this laboratory or demonstration exercise, we mount a small airfoil with its long axis vertical at one end of a nearly frictionless rotating platform. Air from a leaf blower produces a sidewise lift force L on the airfoil and a drag force D in the direction of the air flow (Fig. 1). The rotating platform is kept in equilibrium by adding…

Heavers, Richard M.; Soleymanloo, Arianne

2011-01-01

227

The steady lifting surface theory with a free-surface  

NASA Astrophysics Data System (ADS)

A method to solve the unsteady lifting surface problem is applied to steady surfaces with a free-surface. The local lifting coefficient appears as a solution to an integral equation of the first kind whose kernel, deduced from the Havelock source potential, is expanded in a Fourier series, with respect to the azimuth angle. Numerical applications such as the calculation of the lift and drag of a lifting wing, and hydrodynamic pressures in the case of turn of a ship are given.

Leclerc, J.; Salauen, P.

228

14 CFR 23.369 - Rear lift truss.  

Code of Federal Regulations, 2010 CFR

...2009-01-01 2009-01-01 false Rear lift truss. 23.369 Section 23.369 Aeronautics and...Structure Flight Loads § 23.369 Rear lift truss. (a) If a rear lift truss is used, it must be designed to withstand...

2009-01-01

229

14 CFR 23.369 - Rear lift truss.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Rear lift truss. 23.369 Section 23.369 Aeronautics and...Structure Flight Loads § 23.369 Rear lift truss. (a) If a rear lift truss is used, it must be designed to withstand...

2010-01-01

230

Lifting scheme: a new philosophy in biorthogonal wavelet constructions  

Microsoft Academic Search

In this paper we present the basic idea behind the lifting scheme, a new construction of biorthogonal wavelets which does not use the Fourier transform. In contrast with earlier papers we introduce lifting purely from a wavelet transform point of view and only consider the wavelet basis functions in a later stage. We show how lifting leads to a faster,

Wim Sweldens

1995-01-01

231

Lower extremity joint moments during symmetric lifting: squat vs stoop  

Microsoft Academic Search

In this study, we analyzed joint moments during the symmetrical lifting in two different postures, using the three-dimensional motion analysis. Boxes weighing 5, 10 and 15kg were lifted by both squat and stoop techniques. The ankle moment in stoop was always larger than that in squat and the support moment was the largest at the end of the lifting in

SeonHong Hwang; SungJae Hwang; YoungEun Kim

2007-01-01

232

Hydraulic lift among native plant species in the Mojave Desert  

Microsoft Academic Search

Hydraulic lift was investigated among native plants in the Mojave Desert using in situ thermocouple psychrometers. Night lighting and day shading experiments were used to verify the phenomenon. Hydraulic lift was detected for all species examined: five shrub species with different rooting depths and leaf phenologies and one perennial grass species. This study was the first to document hydraulic lift

Carolyn K. Yoder; Robert S. Nowak

1999-01-01

233

VELOCITY AND SCALAR MEASUREMENTS IN NEIGHBORING LIFTED EDGE FLAMES  

Microsoft Academic Search

Laminar lifted edge flames stabilized above a five-exit slot burner are examined experimentally using particle imaging velocimetry and OH planar laser-induced fluorescence. In the present study, partially premixed methane and air are used to create a single lifted tribrachial flame that replicates many previous studies. Utilizing the same burner, two neighboring lifted tribrachial flames whose flow fields interact are also

AMIT WASON; WILLIAM F. CARNELL JR; MICHAEL W. RENFRO

2006-01-01

234

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Lift and drag device indicator. 25.699 Section...Control Systems § 25.699 Lift and drag device indicator. (a) There must...the pilots the position of each lift or drag device having a separate control...

2013-01-01

235

Spinal loading when lifting from industrial storage bins  

Microsoft Academic Search

The study documented three-dimensional spinal loading during lifting from an industrial bin. Two lifting styles and two bin design factors were examined in Phase I. The lifting style measures in Phase I were one hand versus two hand and standing on one foot versus two feet. The bin design variables were region of load in the bin and bin height.

S. A. Ferguson; L. L. Gaudes-MacLaren; W. S. Marras; T. R. Waters; K. G. Davis

2002-01-01

236

Biomechanical evaluation of lift postures in adult Koli female labourers  

Microsoft Academic Search

Three lift-postures, back straight and knees bent, back bent and knees straight and squatting were evaluated biomechanically based on data from 100 Koli female labourers, when lifting loads from the floor to hold them at knee height. The maximum weight was lifted with the back bent and the knees straight which is a posture commonly used by Indian labourers for

MONICA MITTAL; S. L. MALIK

1991-01-01

237

Adaptive Directional Lifting-Based Wavelet Transform for Image Coding  

Microsoft Academic Search

We present a novel 2-D wavelet transform scheme of adaptive directional lifting (ADL) in image coding. Instead of alter- nately applying horizontal and vertical lifting, as in present prac- tice, ADL performs lifting-based prediction in local windows in the direction of high pixel correlation. Hence, it adapts far better to the image orientation features in local windows. The ADL transform

Wenpeng Ding; Feng Wu; Xiaolin Wu; Shipeng Li; Houqiang Li

2007-01-01

238

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Lift and drag device indicator. 25.699...STANDARDS: TRANSPORT CATEGORY AIRPLANES Design and Construction ...Systems § 25.699 Lift and drag device indicator. (a...the position of each lift or drag device having a...

2010-01-01

239

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2010 CFR

...2009-01-01 false Lift and drag device indicator. 25.699...STANDARDS: TRANSPORT CATEGORY AIRPLANES Design and Construction ...Systems § 25.699 Lift and drag device indicator. (a...the position of each lift or drag device having a...

2009-01-01

240

Occupational risk factors and reproductive health of women  

Microsoft Academic Search

Results From the examination of studies dealing with exposures of women to chemical agents, pesticides, physical agents, ergonomic factors and stress, it appears that at present the evidence is sufficient to warrant the maximum protection of pregnant women to several well-documented occupational risk factors. These include exposures to anaesthetic gases, antineoplastic drugs, heavy metals, solvents, heavy physical work and irregular

Irene Figa

241

Maori Occupational Segregation  

Microsoft Academic Search

There are many schemata of occupational classification. One of the more satisfactory is the Smith scheme which classified white-collar occupations into six groups. This schema was adapted by Hill and Brosnan to include blue-collar occupations and used to compare the occupational distribution of New Zealand's major ethnic groups as at the 1981 census. This article uses that revised schema to

Peter Brosnan

1987-01-01

242

Occupational Therapy Assistant.  

ERIC Educational Resources Information Center

This document, which is designed for use in developing a tech prep competency profile for the occupation of occupational therapy assistant, lists technical competencies and competency builders for 16 units pertinent to the health technologies cluster in general as well as those specific to the occupation of occupational therapy assistant. The…

Ohio State Univ., Columbus. Center on Education and Training for Employment.

243

Occupational Therapy Assistant.  

ERIC Educational Resources Information Center

|This document, which is designed for use in developing a tech prep competency profile for the occupation of occupational therapy assistant, lists technical competencies and competency builders for 16 units pertinent to the health technologies cluster in general as well as those specific to the occupation of occupational therapy assistant. The…

Ohio State Univ., Columbus. Center on Education and Training for Employment.

244

Lift force acting on the cylinder in viscous liquid under vibration  

NASA Astrophysics Data System (ADS)

The averaged lift force acting on a solid in viscous liquid in case of translational or rotary vibrations of a cavity is experimentally investigated. Experiments are performed with a heavy cylinder; different types of vibrations, translational and rotational, are investigated. It is found that the vibrations excite the mean lift force which could provide the suspension of solid even in gravity field. The repulsion lift force acts on the body near the walls of the vibrating cavity. It is caused by the viscous hydrodynamic interaction of oscillating body with the wall and is significant at a distance comparable with the thickness of Stokes layer. The intensification of vibration results in the excitation of tangential lift force, which is caused by the brake of the symmetry of the body's oscillations with respect to the cavity wall. In case of rotary vibrations the lift force of high intensity manifests itself in the bulk of the cavity due to the interaction of body with the oscillating shear flow. The mean dynamics of the solid body in a cavity under the rotary vibrations is determined by the combined action of two averaged vibrational effects—levitation of the body in the oscillating shear flow and hydrodynamic interaction of the body with the wall. In case of translational vibrations the dynamics of the solid is mainly determined by interaction with the walls. The experiments demonstrate that the vibrations have strong mean effect on the bodies in liquid; they could be used for efficient control of solid inclusions in microgravity and must be taken into account in space experiments and technologies.

Kozlov, V.; Ivanova, A.; Schipitsyn, V.; Stambouli, M.

2012-10-01

245

Recommendations and comparisons for selecting artificial-lift methods  

SciTech Connect

Selecting the proper artificial-lift method is critical to the long-term profitability of most producing oil and gas wells. This paper compares the main selection attributes for the current eight major artificial-lift methods and provides practical guidelines, based on practical and proven technology, on the performance and operating capabilities of the methods. This paper covers beam pumping, progressing cavity pumping, electric submersible pumping, hydraulic reciprocating pumping, hydraulic jet systems, continuous gas-lift systems, intermittent gas-lift systems, and plunger lift.

Bucaram, S.M. (Arco E P Technology, Plano, TX (United States)); Clegg, J.D.; Hein, N.W. Jr.

1993-12-01

246

Industrial hygiene of selected heavy metals  

SciTech Connect

The industrial hygiene of heavy metals consists of recognition, evaluation, and control of exposures in the occupational environment. Several of these metals have been in use since ancient times. Reports of health effects and poisonings from overexposures also have a long history. This report discusses the industrial hygiene of the heavy metals, lead, cadmium, mercury, and manganese.

Woodring, J.L.

1993-08-01

247

Health Occupations Curriculum. Skills for Nursing Assistant. Volume 3, Unit 8.  

ERIC Educational Resources Information Center

|Part of a health occupations program, this instructional unit contains 13 learning modules for use in training nursing assistants. Covered in the modules are (1) making beds, bathing patients, and measuring intake and output; (2) body mechanics, moving and lifting patients, range of motion exercises, and caring for patients in casts or traction;…

Arizona State Dept. of Education, Phoenix.

248

Reported occupational injuries at Swedish recycling centres - based on official statistics.  

PubMed

Swedish recycling centres are manned facilities for waste collection. There is no special category in the official injury statistics for employees at recycling centres, which precludes a straightforward analysis of reported occupational injuries. This study aimed at identifying the frequency of reported accidents and diseases and the type of events that contribute to such injuries at recycling centres, based on official injury statistics. The employees were identified as being affected by more than three to five times as many accidents compared with the total workforce in Sweden. The reported accidents had occurred during a wide range of situations, but most frequently during manual handling of waste. Reported work-related diseases were mostly associated with musculoskeletal disorders, mainly due to heavy lifting. A more detailed classification of sanitation professions and workplaces in the official injury statistics would facilitate future studies of injuries in a specific professional category, e.g. employees at recycling centres. Suggestions for prevention are given. STATEMENT OF RELEVANCE: The present article describes all reported work accidents and diseases among employees at recycling centres from 1992 to February 2005. It also highlights the problem of identifying new working groups in the official statistics and gives advice for a detailed classification to facilitate such future studies of injuries. PMID:21491278

Engkvist, I-L; Svensson, R; Eklund, J

2011-04-01

249

[Face lift--indications, contraindications and operation].  

PubMed

The face lift procedure is often performed in aesthetic plastic surgery. It corrects the stigmata of age, i.e. the multiple facial wrinkles and the sagging of the atrophic soft tissues by undermining and retensioning the superficial and deeper facial and cervical structures. Since the public can not fully appreciate the extent and the inconveniences involved with this operation, emphasis must be laid on an exact preoperative information of the patient with regards to possible complications, the pros and cons of this procedure and the results to be expected. In this paper the face lift operation is explained in detail and the indications and contraindications given. The most frequent postoperative complications are outlined and the preventive measures and modalities of treatment discussed. From the medico-legal point of view it is important that such an operation is performed by a certified and well experienced plastic surgeon. PMID:10330880

Tschopp, H

1999-04-01

250

Hydraulic lift can solve many production problems  

SciTech Connect

For over five decades, hydraulic pumping systems have offered creative solutions for operators faced with a wide array of producing problems. Today, the well-developed and proven capabilities of this lift method continue to provide innovative approaches in dealing with oil well production, testing and evaluation requirements. The performance characteristics of the system give it unique adaptability to a wide range of changing well conditions, to effective use in shallow to extreme lifting depths, along with the convenient ability to install and retrieve the downhole pump through fluid circulation versus the use of a pulling unit. Hydraulic piston pumps are used in producing from low volumes up to 8,000 bpd. Jet pumps are used to produce up to 80,000 bpd.

Jackson, P.G. (Trico Industries, Inc., Huntington Park, CA (US))

1990-05-01

251

Induction factor optimization through variable lift control  

NASA Astrophysics Data System (ADS)

Due to practical design limitations coupled with the detrimental effects posed by complex wind regimes, modern wind turbines struggle to maintain or even reach ideal operational states. With additional gains through traditional approaches becoming more difficult and costly, active lift control represents a more attractive option for future designs. Here, plasma actuators have been explored experimentally in trailing edge applications for use in attached flow regimes. This authority would be used to drive the axial induction factor toward the ideal given by the Betz limit through distributed lift control thereby enhancing energy capture. Predictions of power improvement achievable by this methodology are made with blade - element momentum theory but will eventually be demonstrated in the field at the Laboratory for Enhanced Wind Energy Design, currently under construction at the University of Notre Dame.

Cooney, John; Corke, Thomas; Nelson, Robert; Williams, Theodore

2011-11-01

252

Lifting to mod $2$ Moore spaces  

Microsoft Academic Search

We try to investigate whether an element of order $2$ in homotopy groups of spheres has a lift to an element of homotopy groups of mod $2$ Moore spaces or not. A typical element of the affirmative property is Thomeier's element of $\\\\pi_{8n+7}(S^{4n+3})$ . And the Whitehead square $[l_{2n+1},l_{2n+1}]$ of the identity class $l_{2n+1}$ of $S^{2n+1}$ is a negative example

Kaoru MORISUGI; Juno MUKAI

2000-01-01

253

Quantification of back motion during asymmetric lifting.  

PubMed

The objective of this study was to determine how trunk motion characteristics (in all three planes of the trunk) change as a free dynamic lifting task becomes more asymmetric. Trunk motion characteristics included range of motion, velocity (peak and average), and acceleration. Previous studies have shown that trunk motion characteristics affect trunk strength as well as the action of the trunk musculature. These trunk motion characteristics were quantified as a function of seven task asymmetries and three task weights. The experimental task required the subject to lift materials in positions commonly seen in the workplace. The range of motion, peak velocity, average velocity, and peak acceleration in each plane of the body were documented during the tasks. Generally, trunk motion characteristics in all three planes increased with an increase in task asymmetry. However, with an increase in task weight all the sagittal plane parameters and one transverse plane parameter decreased. Models were constructed to predict trunk motion characteristics given a task asymmetry and weight. When these motion components were compared to dynamic strength estimates from previous studies it was found that dynamic asymmetric lifts could reduce available strength up to 21% of maximum static strength. The results provide new insight into factors associated with the risk of developing low back disorders. PMID:1633792

Ferguson, S A; Marras, W S; Waters, T R

254

Group Lifting Structures For Multirate Filter Banks, I: Uniqueness Of Lifting Factorizations  

SciTech Connect

This paper studies two-channel finite impulse response (FIR) perfect reconstruction filter banks. The connection between filter banks and wavelet transforms is well-known and will not be treated here. Figure 1 depicts the polyphase-with-advance representation of a filter bank [6]. A lifting factorization, is a factorization of polyphase matrices into upper and lower triangular lifting matrices. The existence of such decompositions via the Euclidean algorithm was shown for general FIR perfect reconstruction filter banks in [9] and was subsequently refined for linear phase filter banks in [10], [6]. These latter works were motivated by the ISO JPEG 2000 image coding standard [11], [12], [10], which specifies whole-sample symmetric (WS, or FIR type 1 linear phase) filter banks, as in Figure 2(a), in terms of half-sample symmetric (RS, or FIR type 2) lifting filters.

Brislawn, Christopher M [Los Alamos National Laboratory

2008-01-01

255

Numerical Simulation of a Powered-Lift Landing, Tracking Flow Features Using Overset Grids, and Simulation of High Lift Devices on a Fighter-Lift-and-Control Wing.  

National Technical Information Service (NTIS)

Attached as appendices to this report are documents describing work performed on the simulation of a landing powered-lift delta wing, the tracking of flow features using overset grids, and the simulation of flaps on the Wright Patterson Lab's fighter-lift...

K. Chawla

1993-01-01

256

Occupational Hearing Loss in Korea  

PubMed Central

In this article, current status of noise exposure in workplaces, trend of workers with noise-induced hearing loss (NIHL), and prevalence of NIHL in workers by industry and job category in Korea were reviewed. In addition, trends of research on the audiological effects such as hearing loss from noise and occupational hearing loss from non-noise in Korea were addressed through reports in industrial audiology. Though noise exposure level has improved, noise still shows the highest rate of cases exceeding exposure limit among workplace hazards. NIHL is the most common occupational disease except work-related disease such as musculoskeletal disorders and cerebrovascular diseases, and NIHL prevalence is thought to be much higher than reported in official publications. Noise affecting hearing comes from various sources such as workplaces, military settings, areas with exposure to high noise, and specific noise sources. There is also occupational hearing loss by non-noise including chemicals such as organic solvents and heavy metals, barotrauma, and trauma due to welding spark. Noise affects daily life through audiological effects such as hearing loss and tinnitus, non-audiological physical effects (e.g., cardiovascular), and psychosocial and behavioral effects. Development of systematic and comprehensive hearing conservation programs for lowering the noise level in workplaces and preventing the NIHL, and preparation of technological, administrative system for its settlement at workplace are urgently needed.

2010-01-01

257

A participatory approach to the study of lifting demands and musculoskeletal symptoms among Hong Kong workers  

PubMed Central

Aims: To investigate the use of a worker based methodology to assess the physical stresses of lifting tasks on effort expended, and to associate this loading with musculoskeletal outcomes (MO). Methods: A cross sectional study was conducted on 217 male manual handling workers from the Hong Kong area. The effects of four lifting variables (weight of load, horizontal distance, twisting angle, and vertical travel distance) on effort were examined using a linguistic approach (that is, characterising variables in descriptors such as "heavy" for weight of load). The numerical interpretations of linguistic descriptors were established. In addition, the associations between on the job effort and MO were investigated for 10 body regions including the spine, and both upper and lower extremities. Results: MO were prevalent in multiple body regions (range 12–58%); effort was significantly associated with MO in 8 of 10 body regions (odds ratios with age adjusted ranged from 1.31 for low back to 1.71 for elbows and forearm). The lifting task variables had significant effects on effort, with the weight of load having twice the effect of other variables; each linguistic descriptor was better described by a range of numerical values rather than a single numerical value. Conclusions: The participatory worker based approach on musculoskeletal outcomes is a promising methodology. Further testing of this approach is recommended.

Yeung, S; Genaidy, A; Deddens, J; Shoaf, C; Leung, P

2003-01-01

258

Health Occupations Cluster Guide.  

ERIC Educational Resources Information Center

|Intended to assist the vocational teacher in designing and implementing a cluster program in health occupations, this guide suggests ideas for teaching the specific knowledge and skills that qualify students for entry-level employment in the health occupations field. The knowledge and skills are applicable to 12 occupations: dental assistant;…

Oregon State Dept. of Education, Salem.

259

Vertical Differentiation among Occupations.  

ERIC Educational Resources Information Center

|It is reported that research on the socioeconomic achievement process has begun to generate anomalous findings, many of which involve occupational status as conventionally measured. The author proposes a theory of vertical occupational differentiation based on the role activities of occupational incumbents. (Author/RLV)|

Spaeth, Joe L.

1979-01-01

260

International occupational health  

Microsoft Academic Search

Working conditions for the majority of the world's workers do not meet the minimum standards and guidelines set by international agencies. Occupational health and safety laws cover only about 10 percent of the population in developing countries, omitting many major hazardous industries and occupations. With rare exception, most countries defer to the United Nations the responsibility for international occupational health.

Joseph LaDou

2003-01-01

261

Hydraulic lift among native plant species in the Mojave Desert  

Microsoft Academic Search

Hydraulic lift was investigated among native plants in the Mojave Desert using in situ thermocouple psychrometers. Night lighting\\u000a and day shading experiments were used to verify the phenomenon. Hydraulic lift was detected for all species examined: five\\u000a shrub species with different rooting depths and leaf phenologies and one perennial grass species. This study was the first\\u000a to document hydraulic lift

Carolyn K. Yoder; Robert S. Nowak

1999-01-01

262

On causality in commutant lifting theorem. I  

Microsoft Academic Search

Two functionals µ(A) and\\u000a$$\\\\bar \\\\mu (A)$$\\u000a for an operatorA were introduced in [11] for the study of causality in commutant lifting theory. In this paper we give sufficient and necessary conditions for\\u000a$$\\\\mu (A) = \\\\bar \\\\mu (A)$$\\u000a in a special case. We prove that in this case\\u000a$$\\\\bar \\\\mu (A) \\\\leqslant \\\\sqrt 2 \\\\mu (A)$$\\u000a, and we

Caixing Gu

1993-01-01

263

Double lift longwalling in thick Japanese seam  

SciTech Connect

Miike Colliery is the largest in Japan, producing 5.2 Mt of clean coal a year. It is located on Kyushu and most of the colliery take lies beneath the Ariake Inland Sea. Mining extends 5-6 km offshore at a depth of 200-700 m below sea level. A number of ventilation shafts have been sunk from artificial islands. The Main Seam has an average thickness of 5m and is worked in two lifts using double ranging drum shearers. The method of working is described.

Not Available

1983-08-01

264

Steady lifting surface theory with a free surface  

NASA Astrophysics Data System (ADS)

Steady lifting surface theory with a free surface is developed by an integral equation method. The local lift coefficient appears as a solution to an integral equation of the first kind whose kernel, deduced from a Havelock source potential, is expanded in a Fourier series with respect to the azimuth angle. The coefficients of this series are definite integrals. The method of steepest descents gives asymptotic approximations to coefficients of large index terms, and the remainder can be evaluated approximately in all cases. Numerical applications such as the calculation of the lift and drag for a lifting wing, and the hydrodynamic pressures arising from the turn of a ship are given.

Leclerc, J.; Salauen, P.

1985-11-01

265

Obesity does not reduce maximum acceptable weights of lift  

Microsoft Academic Search

The maximum acceptable weights of lift (MAWL) of obese and non-obese participants were empirically investigated. Three obesity levels were considered: non-obese (18.5kg\\/m2?body mass index (BMI)?24.9kg\\/m2), moderately obese (35kg\\/m2?BMI?39.9kg\\/m2) and extremely obese (BMI? 40kg\\/m2). Ten male and 10 female participants were recruited for each obesity level. The participants determined their MAWL for 18 different lifting task conditions (six lifting frequencies×three lifting

Devender Singh; Woojin Park; Martin S. Levy

2009-01-01

266

77 FR 20558 - Federal Motor Vehicle Safety Standards; Platform Lifts for Motor Vehicles; Platform Lift...  

Federal Register 2010, 2011, 2012, 2013

...a means for illuminating characters to make them visible under...that measurement of handrail displacement on a lift mounted on a test...Sec. 571.101) must have characters that are illuminated in accordance...means for illuminating the characters to make them visible...

2012-04-05

267

Occupational Employment Statistics  

NSDL National Science Digital Library

US occupations are featured in this information-rich resources from the Bureau of Labor Statistics. The 1996 Occupational Employment Statistics Survey differs from previous surveys in that it includes wage data by occupation for the first time. The site contains a description of the survey and complete national and state data for 760 occupations in seven major areas. Included are occupation title, number of employees, hourly mean and median wage, and an OES code number that provides information about the occupation and its employment distribution by wage range where surveyed (distribution is for the national survey only). An occupational search engine is forthcoming. The site also contains information about previous OES surveys back to 1988.

268

Occupational injuries in Ghana.  

PubMed

Household interviews were used to survey 21,105 persons living in 431 urban and rural sites in Ghana, to determine the nature and extent of their occupational injuries. Annual occupational injury rates were 11.5 injuries/1000 persons in the urban areas and 44.9/1000 in the rural areas. Occupational injuries had higher mortality, longer disability, and higher treatment costs than non-occupational injuries. There were substantial occupational injury rates among children, especially in rural areas. In the urban areas, the largest numbers of injuries were to drivers (12.7% of urban occupational injuries) and traders (19.4%), most of which were road-traffic-related. In the rural areas, most injuries (71.6%) were to farm workers. Occupational injuries are a substantial burden in Ghana. Priorities include improving road safety and improving the prevention and treatment of injuries from nonmechanized farming. PMID:16130964

Mock, Charles; Adjei, Samuel; Acheampong, Frederick; Deroo, Lisa; Simpson, Kate

269

Lifting wavelet method of target detection  

NASA Astrophysics Data System (ADS)

Image target recognition plays a very important role in the areas of scientific exploration, aeronautics and space-to-ground observation, photography and topographic mapping. Complex environment of the image noise, fuzzy, all kinds of interference has always been to affect the stability of recognition algorithm. In this paper, the existence of target detection in real-time, accuracy problems, as well as anti-interference ability, using lifting wavelet image target detection methods. First of all, the use of histogram equalization, the goal difference method to obtain the region, on the basis of adaptive threshold and mathematical morphology operations to deal with the elimination of the background error. Secondly, the use of multi-channel wavelet filter wavelet transform of the original image de-noising and enhancement, to overcome the general algorithm of the noise caused by the sensitive issue of reducing the rate of miscarriage of justice will be the multi-resolution characteristics of wavelet and promotion of the framework can be designed directly in the benefits of space-time region used in target detection, feature extraction of targets. The experimental results show that the design of lifting wavelet has solved the movement of the target due to the complexity of the context of the difficulties caused by testing, which can effectively suppress noise, and improve the efficiency and speed of detection.

Han, Jun; Zhang, Chi; Jiang, Xu; Wang, Fang; Zhang, Jin

2009-11-01

270

Lift-based paddling in diving grebe.  

PubMed

To examine the hydrodynamic propulsion mechanism of a diving great crested grebe (Podiceps cristatus), the three-dimensional kinematics was determined by digital analysis of sequential video images of dorsal and lateral views. During the acceleration phase of this foot-propelled bird, the feet move through an arc in a plane nearly normal to the bird's line of motion through the water, i.e. the toes move dorsally and medially but not caudally relative to the water. The kinematics of the grebe's lobed feet is different from that in anseriforms, whose feet move in a plane mostly parallel to the bird's line of progress through the water. Our results suggest that the foot-propelled locomotor mechanism of grebes is based primarily on a lift-producing leg and foot stroke, in contrast to the drag-based locomotion assumed previously. We suggest that the lift-based paddling of grebes considerably increases both maximum swimming speed and energetic efficiency over drag-based propulsion. Furthermore, the results implicate a new interpretation of the functional morphology of these birds, with the toes serving as a self-stabilizing multi-slotted hydrofoil during the power phase. PMID:11316488

Johansson, L C; Lindhe Norberg, U M

2001-05-01

271

Relative importance of expertise, lifting height and weight lifted on posture and lumbar external loading during a transfer task in manual material handling  

Microsoft Academic Search

The objective of this study was to measure the effect size of three important factors in manual material handling, namely expertise, lifting height and weight lifted. The effect of expertise was evaluated by contrasting 15 expert and 15 novice handlers, the effect of the weight lifted with a 15-kg box and a 23-kg box and the effect of lifting height

André Plamondon; Christian Larivière; Alain Delisle; Denys Denis; Denis Gagnon

2012-01-01

272

Listing Occupational Carcinogens  

PubMed Central

The occupational environment has been a most fruitful one for investigating the etiology of human cancer. Many recognized human carcinogens are occupational carcinogens. There is a large volume of epidemiologic and experimental data concerning cancer risks in different work environments. It is important to synthesize this information for both scientific and public health purposes. Various organizations and individuals have published lists of occupational carcinogens. However, such lists have been limited by unclear criteria for which recognized carcinogens should be considered occupational carcinogens, and by inconsistent and incomplete information on the occupations and industries in which the carcinogenic substances may be found and on their target sites of cancer. Based largely on the evaluations published by the International Agency for Research on Cancer, and augmented with additional information, the present article represents an attempt to summarize, in tabular form, current knowledge on occupational carcinogens, the occupations and industries in which they are found, and their target organs. We have considered 28 agents as definite occupational carcinogens, 27 agents as probable occupational carcinogens, and 113 agents as possible occupational carcinogens. These tables should be useful for regulatory or preventive purposes and for scientific purposes in research priority setting and in understanding carcinogenesis.

Siemiatycki, Jack; Richardson, Lesley; Straif, Kurt; Latreille, Benoit; Lakhani, Ramzan; Campbell, Sally; Rousseau, Marie-Claude; Boffetta, Paolo

2004-01-01

273

Lifting wavelet transform based adaptive filter for active power filters  

Microsoft Academic Search

This paper presents a new harmonic measurement scheme on lifting wavelet transform based adaptive filter (LWTAF) for active power filters (APFs). As one of methods to build second-generation wavelets, lifting wavelet transform (LWT) can be easy to achieve in time domain for its original bit location calculation. LWT could lessen calculation complexity and depress course due to its particular structure,

Liu Hui; Liu Guohai; Shen Yue

2008-01-01

274

CONSTANT VELOCITY IN LIFTING AS A CRITERION OF MUSCULAR SKILL  

Microsoft Academic Search

The derivation of a measure of skill from changes in velocity throughout a lifting movement was studied. The distances traversed by the wrists in lifting n 10 kg weight to the height of 1-67 in were recorded photographically with the aid of neon lights flashing at 0.1 sec intervals. The values of velocity, acceleration and force were computed at successive

A. ZAJACZKOWSKA

1962-01-01

275

73 FR 75246 - Longshoring and Marine Terminals; Vertical Tandem Lifts  

Federal Register 2010, 2011, 2012, 2013

...connections can safely support VTLs under the worst reasonably anticipated conditions. The...loaded container is lifted. In fact, a bad weld would pose a greater hazard for a...41).\\22\\ This case represents the worst general scenario for lifting more...

2008-12-10

276

Airfield Marking Paints. Ii. Effect on Lifting of Slurry Seal.  

National Technical Information Service (NTIS)

A study was made to determine the basic causes of lifting of slurry seal from asphaltic subgrade under stripes of reflectorized airfield marking paint. Lifting was greater for double-thickness than for single-thickness stripes, especially for those with p...

R. W. Drisko

1966-01-01

277

PERSONAL IDENTIFICATION BY MULTIRESOLUTION ANALYSIS OF LIFTING DYADIC WAVELETS  

Microsoft Academic Search

This paper proposes a novel method for identifying persons by multiresolution analysis of lifting dyadic wavelets. Our method consists of three procedures: face learning, detection and identification. In the learning procedure, new highpass filters for capturing facial parts are constructed by tuning free parameters in the lifting scheme. By using the learned fil- ters, human faces can be detected from

Shigeru Takano; Koichi Niijima; Koichi Kuzume

278

CANON and Anammox in a gas-lift reactor  

Microsoft Academic Search

Anoxic ammonium oxidation (Anammox) and Completely Autotrophic Nitrogen removal Over Nitrite (CANON) are new and promising microbial processes to remove ammonia from wastewaters characterized by a low content of organic materials. These two processes were investigated on their feasibility and performance in a gas-lift reactor. The Anammox as well as the CANON process could be maintained easily in a gas-lift

A. Olav Sliekers; K. A Third; W Abma; J. G Kuenen; M. S. M Jetten

2003-01-01

279

Some Aspects of the Lift Force on a Spherical Bubble  

Microsoft Academic Search

Several situations in which a spherical bubble experiences a lift force are examined, especially through the use of computational results obtained by solving the full Navier–Stokes equations. The lift force is computed over a wide range of Reynolds number for the case of pure shear flow, pure strain and solid body rotation. Using these results, the validity of asymptotic solutions

Jacques Magnaudet; Dominique Legendre

1997-01-01

280

Recent Progress on Development and Understanding of High Lift Systems.  

National Technical Information Service (NTIS)

In aircraft design the constraints between the high speed cruise and the low speed takeoff and landing conditions force the designer to incorporate some form of high lift to device to improve the lift at low speed. Most aircraft, be they civil or military...

D. J. Butter

1984-01-01

281

Optimization of the lithographic performance for lift-off processing  

NASA Astrophysics Data System (ADS)

Shipley MICROPOSIT LOL lift-off technology exploits a develop rate difference in a resist, LOL1000 bi-layer system to generate retrograde profiles. This is an enabling technology for 'additive' processing. Deposition follows lithography and the resist is then 'lifted off' to generate a patterned layer.

Yin, Wenyan; Fillmore, Ward; Dempsey, Kevin J.

1999-05-01

282

Stabilization mechanisms of lifted laminar flames in axisymmetric jet flows  

Microsoft Academic Search

Stabilization mechanisms of lifted laminar propane flames are investigated in an axisymmetric jet flow configuration. Detailed mixing and flow fields upstream of the flame lift-off heights measured by Chung and coworkers [28–30] are calculated on a nonreacting flow basis. The local stoichiometric axial velocity, Ust, and scalar dissipation rate, ?st, are obtained at points that are upstream of the stabilization

Yung-Cheng Chen; Robert W. Bilger

2000-01-01

283

Gurney flap—Lift enhancement, mechanisms and applications  

Microsoft Academic Search

Since its invention by a race car driver Dan Gurney in 1960s, the Gurney flap has been used to enhance the aerodynamics performance of subsonic and supercritical airfoils, high-lift devices and delta wings. In order to take stock of recent research and development of Gurney flap, we have carried out a review of the characteristics and mechanisms of lift enhancement

J. J. Wang; Y. C. Li; K.-S. Choi

2008-01-01

284

On a better understanding of hydraulic lift: A numerical study  

Microsoft Academic Search

Hydraulic lift is the transport of water from moist into drier soil layers through plant root systems: Plant roots sometimes do not only take up water but also release water if the soil is dry. Hydraulic lift has been shown for a relatively small number of species, but it is believed to be a more general phenomenon. We model numerically

M. Mendel; S. Hergarten; H. J. Neugebauer

2002-01-01

285

Floor Slope Effects on Lifting Kinematics and Kinetics.  

National Technical Information Service (NTIS)

The specific aim of the first study was to determine sub-maximal lifting capacities while lifting a box from an inclined surface (facing both up and down a 10 and 20 slope and the level) to knuckle height. The task was constructed such that both the perso...

R. F. Reiser

2004-01-01

286

THE LIFTING SCHEME: A CONSTRUCTION OF SECOND GENERATION WAVELETS  

Microsoft Academic Search

We present the lifting scheme, a simple construction of second generation wavelets; these are wavelets that are not necessarily translates and dilates of one fixed function. Such wavelets can be adapted to intervals, domains, surfaces, weights, and irregular samples. We show how the lifting scheme leads to a faster, in-place calculation of the wavelet transform. Several examples are included.

WIM SWELDENS

1997-01-01

287

Prediction of Two-Person Team Lifting Capacity.  

National Technical Information Service (NTIS)

Predictive models for team lifting capacity are important for task and equipment design, as well as worker selection and placement. The purpose of this study was to develop a prediction equation for single gender and mixed gender two- person team lifting ...

V. J. Rice M. A. Sharp B. C. Nindl R. K. Bills

1995-01-01

288

Solid state lift for micrometering in a fuel injector  

DOEpatents

A fuel injector performs main fuel injection by raising fuel pressure in a nozzle chamber to lift a check valve member to a fully open position, and performs preinjection or microinjection by operating a solid state motor to lift the check valve member a much smaller distance.

Milam, David M. (Metamora, IL); Carroll, Thomas S. (Peoria, IL); Lee, Chien-Chang (Rochester Hills, MI); Miller, Charles R. (Metamora, IL)

2002-01-01

289

Leading-Edge Vortices Elevate Lift of Autorotating Plant Seeds  

Microsoft Academic Search

As they descend, the autorotating seeds of maples and some other trees generate unexpectedly high lift, but how they attain this elevated performance is unknown. To elucidate the mechanisms responsible, we measured the three-dimensional flow around dynamically scaled models of maple and hornbeam seeds. Our results indicate that these seeds attain high lift by generating a stable leading-edge vortex (LEV)

D. Lentink; W. B. Dickson; J. L. van Leeuwen; M. H. Dickinson

2009-01-01

290

Adaptive lift control of an electrohydraulic camless valvetrain system  

Microsoft Academic Search

Presents an adaptive feedback control of valve lift for an electrohydraulic actuator for camless variable valve timing engine operation. The adaptive control maintains peak value of lift in presence of variations in engine speed, hydraulic fluid temperature and manufacturing variability of valve assemblies

M. D. Anderson; Tsu-Chin Tsao; M. B. Levin

1998-01-01

291

Three dimensional moments in the lumbar spine during asymmetric lifting  

Microsoft Academic Search

Objective. To better understand the loads placed on the spine during asymmetric lifting.Design. Analysis of variance was used to test the effects of asymmetry (0, 45, 90 °), event (up, down, min and max), and trial (first and second) on applied spine moments and resulting EMG signals in the lumbar spine.Background. Loading conditions resulting from symmetric lifting are well documented

David M. Hooper; Vijay K. Goel; Assen Aleksiev; Kevin Spratt; Kristin M. Bolte; Malcolm Pope

1998-01-01

292

View of West end of central lift span truss web ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of West end of central lift span truss web of Tensaw River Bridge, showing operator's ladder and platform, diagonals and posts, looking southwest - Tensaw River Lift Bridge, Spanning Tensaw River at U.S. Highway 90, Mobile, Mobile County, AL

293

Three-dimensional lifting schemes for motion compensated video compression  

Microsoft Academic Search

Three-dimensional wavelet decompositions are efficient tools for scalable video coding. We show a lifting formulation for these decompositions. The temporal wavelet transform is inherently nonlinear, due to the motion estimation step, and the lifting formalism allows us to provide several improvements to the scheme initially proposed by Choi and Woods: a better processing of the uncovered areas is proposed and

B. Pesquet-Popescu; V. Bottreau

2001-01-01

294

Active control of an atmospheric tether using a lifting probe  

NASA Astrophysics Data System (ADS)

In recent years, a large number of atmospheric tether missions to the Earth and other planets have been proposed. Tethered probes in these studies are generally modeled as simple spheres whose altitude must be controlled using slow tether reel mechanisms. Using a hypersonic lifting body as the probe provides a faster, more effective means for controlling the tether system. In addition, the use of a moveable tether attachment point represents a simple mechanism to control the altitude and aerodynamic forces on the lifting probe. This thesis presents a new mathematical model of a flexible-elastic tether system, including a lifting probe with a moveable attachment point. For the circular orbit case, a simplified linear version of this model is used to analyze the stability of the tether system and to develop a controller. The results indicate that the lifting probe controller is able to rapidly alter the probe altitude and effectively reject atmospheric disturbances. Next, the lifting probe system is applied to the aerocapture maneuver. The analysis shows that the use of the lifting probe during aerocapture can substantially reduce the required mass of the probe versus traditional tether aerocapture proposals. The lifting probe system can also significantly reduce the final eccentricity of the capture orbit resulting in large mass savings versus retropropulsion maneuvers. These results indicate that the lifting probe with moveable attachment point greatly increases the range of potential atmospheric missions for tether systems.

Biswell, Brian Lee

295

A lifting line theory for a three-dimensional hydrofoil  

NASA Astrophysics Data System (ADS)

Prandtl's lifting line theory was generalized to the lifting problem of a three-dimensional hydrofoil in the presence of a free surface. Similar to the classical lifting theory, the singularity distribution method was utilized to solve two-dimensional lifting problems for the hydrofoil beneath the free surface at the air-water interface, and a lifting line theory was developed to correct three-dimensional effects of the hydrofoil with a large aspect ratio. Differing from the classical lifting theory, the main focus was on finding the three-dimensional Green function of the free surface induced by the steady motion of a system of horseshoe vortices under the free surface. Finally, numerical examples were given to show the relationship between the lift coefficient and submergence Froude numbers for 2-D and 3-D hydrofoils. If the submergence Froude number is small free surface effect will be significant registered as the increase of lift coefficient. The validity of these approaches was examined in comparison with the results calculated by other methods.

Liang, Hui; Zong, Zhi

2011-06-01

296

Wave drag due to lift for transonic airplanes  

Microsoft Academic Search

Lift-dominated pointed aircraft configurations are considered in the transonic range. To make the approximations more transparent, two-dimensionally cambered untwisted lifting wings of zero thickness with aspect ratio of order one are treated. An inner expansion, which starts as Jones's theory, is matched to a nonlinear outer transonic theory as in Cheng and Barnwell's earlier work. To clarify issues, minimize ad

Julian D. Cole; Norman D. Malmuth

2005-01-01

297

21 CFR 880.5510 - Non-AC-powered patient lift.  

Code of Federal Regulations, 2010 CFR

...5510 Non-AC-powered patient lift. (a) Identification. A non-AC-powered patient lift is a hydraulic, battery, or mechanically powered...either fixed or mobile, used to lift and transport a patient in...

2009-04-01

298

21 CFR 880.5510 - Non-AC-powered patient lift.  

Code of Federal Regulations, 2013 CFR

...5510 Non-AC-powered patient lift. (a) Identification. A non-AC-powered patient lift is a hydraulic, battery, or mechanically powered...either fixed or mobile, used to lift and transport a patient in...

2013-04-01

299

21 CFR 880.5510 - Non-AC-powered patient lift.  

Code of Federal Regulations, 2010 CFR

...5510 Non-AC-powered patient lift. (a) Identification. A non-AC-powered patient lift is a hydraulic, battery, or mechanically powered...either fixed or mobile, used to lift and transport a patient in...

2010-04-01

300

49 CFR 571.404 - Standard No. 404; Platform lift installations in motor vehicles.  

Code of Federal Regulations, 2010 CFR

... false Standard No. 404; Platform lift installations in motor vehicles. 571...571.404 Standard No. 404; Platform lift installations in motor vehicles. S1...requirements for vehicles equipped with platform lifts used to assist persons with limited...

2009-10-01

301

49 CFR 571.404 - Standard No. 404; Platform lift installations in motor vehicles.  

Code of Federal Regulations, 2010 CFR

... false Standard No. 404; Platform lift installations in motor vehicles. 571...571.404 Standard No. 404; Platform lift installations in motor vehicles. S1...requirements for vehicles equipped with platform lifts used to assist persons with limited...

2010-10-01

302

7. 3/4 VIEW LOOKING NORTHWEST SHOWING SIDE OF LIFT SPAN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. 3/4 VIEW LOOKING NORTHWEST SHOWING SIDE OF LIFT SPAN AND THE ABUTMENT AND LIFT TOWER OF RAILROAD BRIDGE ADJACENT TO CARTER ROAD BRIDGE. - Carter Road Lift Bridge, Spanning Cuyahoga River at Carter Road, Cleveland, Cuyahoga County, OH

303

Estimation of an Occupational Choice Model when Occupations Are Misclassified  

ERIC Educational Resources Information Center

This paper develops an empirical occupational choice model that corrects for misclassification in occupational choices and measurement error in occupation-specific work experience. The model is used to estimate the extent of measurement error in occupation data and quantify the bias that results from ignoring measurement error in occupation codes…

Sullivan, Paul

2009-01-01

304

Separation of blood cells using hydrodynamic lift  

NASA Astrophysics Data System (ADS)

Using size and deformability as intrinsic biomarkers, we separate red blood cells (RBCs) from other blood components based on a repulsive hydrodynamic cell-wall-interaction. We exploit this purely viscous lift effect at low Reynolds numbers to induce a lateral migration of soft objects perpendicular to the streamlines of the fluid, which closely follows theoretical prediction by Olla [J. Phys. II 7, 1533, (1997)]. We study the effects of flow rate and fluid viscosity on the separation efficiency and demonstrate the separation of RBCs, blood platelets, and solid microspheres from each other. The method can be used for continuous and label-free cell classification and sorting in on-chip blood analysis.

Geislinger, T. M.; Eggart, B.; Braunmüller, S.; Schmid, L.; Franke, T.

2012-04-01

305

Electromagnetic telemetry improves artificial lift efficiency  

SciTech Connect

Several applications currently exist for wireless electromagnetic telemetry technology, including downhole pressure and temperature monitoring during hydraulic stimulation treatments, drillstem tests, pressure transient analysis and various other short-term and long-term well testing programs. The telemetry acquisition system (TAS) has been in commercial field use performing these functions for more than two years. Numerous logical applications also exist for a tool with much longer battery duration, about 12--18 months between battery changes, which can transmit this data from a semipermanent installation. The production analysis tool (PAT) has been developed for these longer term applications. The PAT tool, by allowing automatic and remote measurements of downhole pressure, can allow production rates to be increased through more interactive control of speed and efficiency of an artificial lift pump system. This paper describes this system and reviews a field application.

Bandy, T.R. [Real Time Diagnostics, Houston, TX (United States); Campbell, B. [PanCanadian Petroleum Ltd., Calgary, Alberta (Canada)

1996-08-01

306

Aerothermochemistry Testing for Lifting Reentry Vehicles  

NASA Astrophysics Data System (ADS)

Dedicated ground testing is a fundamental requirement for TPS design since nowadays spacecraft, which have stringent mass budget, need more and more precise and specific testing conditions. Plasma wind tunnels are commonly used for the suitable dissociated flow environments they provide for stagnation point testing. This paper explores the capabilities that such facilities could offer also for off- stagnation point testing to complement aerothermodynamic databases related to lifting reentry vehicles. A methodology for simulating reacting boundary layers in off-stagnation point conditions is assessed with numerical computations. The VKI Plasmatron facility and the measurement techniques developed for the new testing configuration are presented. A testing campaign is run for the CMC materials corresponding to the windward side and the body flap of the IXV. The first experimental results are processed to analyze the testing methodology and its application to flight extrapolation.

Chazot, O.; Panerai, F.; van der Haegen, V.

2011-08-01

307

Occupational commitments and paternal deprivation.  

PubMed

In the post-war era the husband-father role has been enlarged to encompass active participation in family life. However, occupational commitments may inhibit active involvement in family life, particularly in the middle classes where work has traditionally been defined as salient. This article reports on an investigation of the consequences of heavy work commitments for father role performance and child development. This investigation, using the case study method, focussed on hospital medicine and the early child-rearing stage of the family life cycle. It was found that fathers felt themselves to be shadowy figures in the background of their children's lives and that mothers experienced single-handed responsibility for child-rearing as burdensome. Children have little experience of a father's companionship, and discipline and work pressures may be transmitted to them. A few children exhibited behaviour difficulties. Suggestions for further study are made. PMID:719854

Elliot, F R

308

DWPF Air Lift Pump Life Cycle Evaluation  

SciTech Connect

The Defense Waste Processing Facility (DWPF) air lift pump was successfully tested at Clemson for 72 days of operation. It provided sufficient flow to pump molten glass without excessive foaming. Slurry feeding also did not reveal any problems with cold cap stability. Metallurgically the Inconel 690 (690) portions of the pump were in excellent condition with no visual evidence of degradation even in high flow regions, i.e., air/melt interface and glass discharge regions. Spinel deposits, which completely covered the air passage on one side, were found at the inlet of each platinum/rhodium (Pt/Rh) nozzle. Although the deposits were extensive, they were porous and did not have an adverse effect on the operation of the pump. The technique used to secure the platinum/rhodium nozzles to the 690 housing appeared to be adequate with only minor oxidation of the 690 threads and glass in-leakage. Galvanic attack was observed where the nozzle formed a seal with the 690. Significant pitting of the 690 was observed around the entire seal. Intergranular cracking of the Pt/Rh alloy was extensive but the cause could not be determined. Testing would be required to evaluate the degradation. Data from the performance test and the metallurgical evaluation are being used to modify the design of the first DWPF production air lift pump. It will be fabricated entirely from 690 and use argon as the purge gas. It is intended to have a service life of 6 months. Recommendations for insertion, operation, and inspection of the pump are also included in this report. Performance data collected from the operation of the production pump will be used to further optimize the design. Laboratory exposure tests should also be performed to evaluate the galvanic effect between platinum/rhodium and 690.

IMRICH, KENNETH

2004-03-15

309

Occupational lung cancer  

SciTech Connect

The author addresses the attribution of lung cancer to cigarette smoking and the problems of confounding synergistic effects of occupational and other carcinogenic risk factors, as well as the divergent trends of declining smoking rates and increasing rates of lung cancer. He also reviews the existing literature to document associations between lung cancer and occupational exposures. Finally, interventions for prevention of occupational lung cancer are discussed.

Cone, J.E.

1987-04-01

310

The influence of lift frequency, lift duration and work experience on discomfort reporting.  

PubMed

Discomfort surveys are commonly used to assess risk in the workplace and prioritize jobs for interventions before an injury or illness occurs. However, discomfort is a subjective measure and the relationship of discomfort to work-related factors is poorly understood. The objective of this study was to understand how reports of discomfort relate to work-related risk factors for the low back. A total of 12 novice and 12 experienced manual materials handlers performed repetitive, asymmetric lifts at different load levels and at six different lift frequencies throughout an 8-h exposure period. Discomfort was recorded hourly throughout the day. Analyses were performed to determine which experimental factors influenced reporting of discomfort and if discomfort trends matched spine loading trends. Novice lifters reported significantly higher discomfort levels than experienced subjects. They also reported increases in discomfort as moment exposure increased and as the exposure time increased. Novices lifting at 8 Nm load moment level reported increased discomfort from 0.07 to 0.63 by the end of the day, at 36 Nm they reported an increase from 0.04 to 0.40 and at 85 Nm they reported an increase from 0.37 to 3.06. Experienced subjects, on the other hand, reported low levels of discomfort regardless of moment exposure, lift frequency or exposure duration. The reported discomforts were generally unrelated to the biomechanical loading on the spine. Discomfort reporting appears to be more a reflection of experience than of work risk factor exposure. Experienced subjects may have more efficient motor patterns, which reduce spinal load and thus discomfort. Novice subjects seemed to have a lower threshold of discomfort. Caution is needed when using discomfort reporting as a means to identify jobs in need of interventions, in that biomechanical loading may not be accurately represented. Discomfort should only be used as a supplement to objective measures, such as spinal loading, to assess the risk of low back disorders. PMID:17536776

Parakkat, Julia; Yang, Gang; Chany, Anne-Marie; Burr, Deborah; Marras, William S

2007-03-01

311

Occupational cancer in Italy.  

PubMed Central

This article is a discussion of occupational cancer in Italy. The introduction provides the necessary context of Italian industrialization and occupational health regulation. This is followed by a review of Italian epidemiologic studies of occupational cancer risks considered in terms of relative measures of risk and attributable risk of carcinogenic agents or exposure circumstances. We attempt to establish the number of workers exposed to carcinogens in Italy and the intensity of their exposures. Finally, the Italian system of compensation for occupational cancer is discussed. Several cohort and case-control studies have addressed the issue of occupational risks, mostly among male workers. The results of these studies suggest that the growing incidence of and mortality by mesothelioma is explained by the widespread and intense exposure to asbestos in some Italian industrial settings. A high attributable risk of lung tumors among male populations in industrial areas of northern Italy is explained by occupational exposures. However, insufficient data are available for clear definition of the extent and intensity of occupational exposure to carcinogenic substances. In Italy, we must prioritize and maximize resources in occupational cancer epidemiology and revitalize the role of national institutions. Recent legislation has established new regulations on the handling of carcinogenic substances in industrial settings, a new list of occupational diseases, and a national registry of mesothelioma linked to asbestos exposure. These legislative changes are expected to have positive effects.

Merler, E; Vineis, P; Alhaique, D; Miligi, L

1999-01-01

312

International occupational health.  

PubMed

Working conditions for the majority of the world's workers do not meet the minimum standards and guidelines set by international agencies. Occupational health and safety laws cover only about 10 percent of the population in developing countries, omitting many major hazardous industries and occupations. With rare exception, most countries defer to the United Nations the responsibility for international occupational health. The UN's international agencies have had limited success in bringing occupational health to the industrializing countries. The International Labor Organization (ILO) conventions are intended to guide all countries in the promotion of workplace safety and in managing occupational health and safety programs. ILO conventions and recommendations on occupational safety and health are international agreements that have legal force only if they are ratified by ILO member states. The most important ILO Convention on Occupational Safety and Health has been ratified by only 37 of the 175 ILO member states. Only 23 countries have ratified the ILO Employment Injury Benefits Convention that lists occupational diseases for which compensation should be paid. The World Health Organization (WHO) is responsible for the technical aspects of occupational health and safety, the promotion of medical services and hygienic standards. Limited WHO and ILO funding severely impedes the development of international occupational health. The U.S. reliance on international agencies to promote health and safety in the industrializing countries is not nearly adequate. This is particularly true if occupational health continues to be regarded primarily as an academic exercise by the developed countries, and a budgetary triviality by the international agencies. Occupational health is not a goal achievable in isolation. It should be part of a major institutional development that touches and reforms every level of government in an industrializing country. Occupational health and safety should be brought to industrializing countries by a comprehensive consultative program sponsored by the United States and other countries that are willing to share the burden. Occupational health and safety program development is tied to the economic success of the industrializing country and its industries. Only after the development of a successful legal and economic system in an industrializing country is it possible to incorporate a successful program of occupational health and safety. PMID:12971685

LaDou, Joseph

2003-08-01

313

Lift Enhancement Using Pulsed Blowing At Compressible Flow Conditions  

NASA Astrophysics Data System (ADS)

Oscillatory wall-jets were introduced through spanwise slots along a NACA 0015 airfoil to establish lift augmentation by the unsteady forcing of the wall layer. Pressure coefficients, lift coefficients, and wake velocity profiles were measured for experiments where the oscillatory blowing momentum coefficient was held constant at various frequencies up to M=0.4. At high angles of attack, it was observed that lift coefficient increased by as much as 80% due to the pulsed blowing and that supercritical flow was detected near the leading edge. Measurements at low angles of attack with the flap set at 20^o (an aft loaded airfoil near cruise conditions) showed that low amplitude pulsed forcing from the flap provided a 27% increasing in lift while steady blowing from the flap reduced lift by as much as 15% even at blowing coefficients as high as 3.5%. Wake profiles showed that not only was the lift enhanced due to the oscillatory blowing, but the drag was reduced, demonstrating the effectiveness of pulsed blowing as a tool to increase lift and reduce drag, especially when compared to the relative ineffectiveness of steady blowing under similar conditions.

Hites, Michael; Nagib, Hassan; Sytsma, Brian; Wygnanski, Israel; Seifert, Avi; Bachar, Tomer

1997-11-01

314

Obesity does not reduce maximum acceptable weights of lift.  

PubMed

The maximum acceptable weights of lift (MAWL) of obese and non-obese participants were empirically investigated. Three obesity levels were considered: non-obese (18.5 kg/m(2)< or= body mass index (BMI)or= 40 kg/m(2)). Ten male and 10 female participants were recruited for each obesity level. The participants determined their MAWL for 18 different lifting task conditions (six lifting frequencies x three lifting heights). An analysis of variance (ANOVA) was conducted to determine the effects of obesity level, gender, lifting height, lifting frequency and their interactions on MAWL. Overall, the ANOVA results indicated that obesity does not reduce MAWL, and thus, suggested that the existing MAWL data can be used to accommodate both general and obese workers. However, further studies based on the biomechanical and physiological approaches are required to provide more complete understanding of obesity effects on lifting tolerance limits. PMID:18501874

Singh, Devender; Park, Woojin; Levy, Martin S

2008-05-23

315

Lift evaluation of a two-dimensional pitching flat plate  

NASA Astrophysics Data System (ADS)

Several previous experimental and theoretical studies have shown that a leading edge vortex (LEV) on an airfoil or wing can provide lift enhancement. In this paper, unsteady two-dimensional (2D) potential flow theory is employed to model the flow field of a pitching flat plate wing. A multi-vortices model is developed to model both the leading edge and trailing edge vortices (TEVs), which offers improved accuracy compared with using only single vortex at each separation location. The lift is obtained by integrating the unsteady Blasius equation. It is found that the motion of vortices contributes significantly to the overall aerodynamic force on the flat plate. A Kutta-like condition is used to determine the vortex intensity and location at the leading edge for large angle of attack cases; however, it is proposed to relax this condition for small angle of attack cases and apply a 2D shear layer model to calculate the circulation of the new added vortex. The results of the simulation are then compared with classical numerical, theoretical, and experimental data for canonical unsteady flat plat problems. Good agreement with these data is observed. Moreover, these results suggested that the leading edge vortex shedding for small angles of attack should be modeled differently than that for large angles of attack. Finally, the results of vortex motion vs. lift indicate that the slow convection of the LEV creates less negative lift while the rapid shedding of the TEV creates more positive lift. The difference between these two contributions of lift results in a total positive lift that lasts for about two chord-length travel of the plate. It is therefore concluded that the lift enhancement during the LEV ``stabilization'' above the wing is a combined effect of both the LEV and TEV motion. This also provides the insights for future active flow control of micro aerial vehicles (MAVs) that the formation and shedding process of LEVs and TEVs can be manipulated to provide lift enhancement.

Xia, X.; Mohseni, K.

2013-09-01

316

Burnout among occupational therapists.  

PubMed

Objectives. Using Maslach's Burnout Inventory (MBI), this study examined burnout among full-time staff occupational therapists including the extent of their burnout; how occupational therapists' burnout compared to four health care professions, and if type of health care setting impacts their level of burnout. Method. The MBI was mailed to each subject in the random sample (n = 3000) of occupational therapists who were American Occupational Therapy Association (AOTA) members. Results. Occupational therapists displayed a higher level of emotional exhaustion, and lower levels of depersonalization and personal accomplishment. Differences were found in the levels of occupational therapists' burnout when compared to four health care professions. Occupational therapists working in chronic care health care settings demonstrated higher levels of burnout than those working in other health care settings. Conclusion. The occupational therapist should strive to match their skills, interests, life style, and experience to the appropriate health care setting to promote a good person-environment fit to decrease burnout and promote quality patient care and personal health. PMID:23941190

Painter, Jane; Akroyd, Duane; Elliot, Sharon; Adams, Robert D

2003-01-01

317

Testosterone and Occupational Achievement.  

ERIC Educational Resources Information Center

|Archival data on 4,462 military veterans linked higher levels of serum testosterone to lower-status occupations. A structural equation model was supported in which higher testosterone, mediated through lower intellectual ability, greater antisocial behavior, and lower education, leads away from white-collar occupations. Contains 49 references.…

Dabbs, James M., Jr.

1992-01-01

318

Occupational Hazard for Teachers?  

MedlinePLUS

... Dallas Friday, October 18, 2013 Related MedlinePlus Pages Occupational Health Speech and Communication Disorders FRIDAY, Oct. 18 (HealthDay ... HealthDay . All rights reserved. More Health News on: Occupational Health Speech and Communication Disorders Recent Health News Page ...

319

Occupational Mobility of Workers  

ERIC Educational Resources Information Center

|The Special Labor Force Report shows that 8.7 percent of workers changed occupations between January, 1972, and January, 1973. The article discusses and tabulates data related to current patterns of mobility; demographic characteristics; flows among occupations; distribution by age, sex, and race; and job and industrial mobility. (Author/MW)|

Byrne, James J.

1975-01-01

320

Occupations, U. S. A.  

ERIC Educational Resources Information Center

|The booklet divides job titles, selected from the Dictionary of Occupational Titles, into 15 career clusters: agribusiness and natural resources, business and office education, communication and media, construction, consumer and home economics, fine arts and humanities, health occupations, hospitality and recreation, manufacturing, marine…

Geneva Area City Schools, OH.

321

Sex and occupational choice  

Microsoft Academic Search

Compared the omnibus personality inventory score patterns of 275 males and 248 females graduating in majors classified into the 5 occupational categories of J. Holland (see pa, vol. 40:12652) in a 5 * 2 multivariate analysis of variance design. Although significant differences were found by sex and occupational category, it was the significant interaction effect which supported the conclusion that

Harriett A. Rose; Charles F. Elton

1971-01-01

322

Cabinetmaker. Occupational Analysis Series.  

ERIC Educational Resources Information Center

|This document contains the analysis of the occupation of cabinetmaker, or joiner, that is accepted by the Canadian Council of Directors as the national standard for the occupation. The front matter preceding the analysis includes exploration of the development of the analysis, structure of the analysis, validation method, scope of the…

Chinien, Chris; Boutin, France

323

Bricklayer. Occupational Analyses Series.  

ERIC Educational Resources Information Center

|This analysis covers tasks performed by a bricklayer, an occupational title some provinces and territories of Canada have also identified as bricklayer-mason, brick and stone mason, and mason. A guide to analysis discusses development, structure, and validation method; scope of the occupation; trends; and safety. To facilitate understanding the…

Cap, Orest; Cap, Ihor; Semenovych, Viktor

324

Control aspects of a compressor station for gas lift  

SciTech Connect

The type and characteristics of the control system to be used for a centrifugal compressor station depend on several factors such as the compressor driver, process requirements, and the conditions under which the compressor will be operated. Designing a compressor control system for gas lift applications present different types of problems than those of conventional pipeline applications. This paper describes the control philosophy of a compressor station used for lifting water in a closed-rotative gas lift installation in Bu Hasa field, Abu Dhabi.

Saadawi, H.

1983-01-01

325

Hydrofoils: optimum lift-off speed for sailboats.  

PubMed

For a hydrofoil sailboat there is a unique optimum lift-off speed. Before this speed is reached, if there are no parasitic vertical hydrofoil appendages, the submerged or partially submerged hydrofoils increase drag and degrade performance. As soon as this speed is reached and the hydrofoils are fully and promptly deployed, the performance of a hydrofoil-borne craft is significantly improved. At speeds exceeding optimum lift-off speed, partially submerged hydrofoils impair performance if there is no significant effect of loading on the hydrofoil lift-to-drag ratio. PMID:17756335

Baker, R M

1968-12-13

326

[Occupational medicine insight into the problem of occupational stress in the construction industry].  

PubMed

According to the present study, in addition to the high accident rate, work in the building trade is characterized by intense muscle strain and constrained physical posture. In bricklaying, for example, a worker moves by hand up to seven tons of stone per shift. Consequently, various health complaints occur far more frequently in this occupation than in the other occupational groups, for instance, back complaints (71%), severe fatigue (58%), pain in the arms and hands (42%), headache (40%) and leg pain (34%). The most complained of factors include effects of the weather (74%), draft (50%), noise (55%), air pollution via dust (53%), skin contact with dirt and harmful substances (47%), moving heavy objects by hand (53%), adverse posture during work (47%), and a high risk of accidents (47%). Besides technical and organizational measures, the prevention of health impairments in employees in the building trade should be promoted by purposive care by works services of occupational medicine. PMID:3687226

Buchberger, J; Nemecek, J; Fahrni, M

1987-01-01

327

[Occupational morbidity in Ulianovsk region].  

PubMed

Retrospective analysis of occupational morbidity in Ulianovsk region proved a definite trend to increase in occupational diseases number. The authors necessitated creation of programs on occupational diseases prevention in the region. PMID:17004507

Shapoval, N S; Fomin, P G; Tseloval'nikova, N V; Nesterova, I G

2006-01-01

328

Occupational Injuries, Illnesses and Fatalities  

MedlinePLUS

... NAICS and SOC Hours-based fatal injury rates Corrections to "Nonfatal Occupational Injuries and Illnesses Requiring Days ... about Census of Fatal Occupational Injuries Database (FI) Correction to news release "Nonfatal Occupational Injuries and Illnesses ...

329

[Market oriented occupational medicine].  

PubMed

The history and the recent state of occupational medicine in Hungary, and its relation with governmental labor organizations are analyzed. In the past 20 years, large "socialist" factories were replaced by smaller companies employing fewer workers. They have been forced to establish contract with occupational health providers. Many of them offer primary care services, whereas family physicians having a board examination in occupational medicine are allowed to work in this field as well. The market of occupational medicine is less regulated, and ethical rules are not always considered. Undercutting prices is a common practice. The recent system could be improved by some regulations which should be respected. There is no reason to make rough changes establishing a new market for profit oriented insurance companies, and to allow employees and employers to work without specification neglecting international agreements. Occupational medicine should be supervised again by the health authorities instead of economists who have quite different, short-term priorities. PMID:22951411

Rurik, Imre; Cseh, Károly

2012-09-01

330

Perspectives in Occupational Dermatology  

PubMed Central

Because large surface areas of the skin are exposed directly to the environment, skin is an organ particularly vulnerable to occupationally induced disease. Statistics show that, excluding accidental injury, nearly half of all occupational illnesses occur in this organ; a fourth of all workers suffering from occupational skin disease lose an average of 10 to 12 workdays. The constant evolution of new industrial chemicals and methods of manufacture continue to bring new skin hazards and disease into the workplace. Occupational health physicians and practitioners, who usually have minimal training in dermatology, must diagnose and treat unfamiliar diseases in a setting of even less familiar, often overwhelming, technology. A thorough understanding of cutaneous defense mechanisms, clinical patterns of occupational skin disease and methods for establishing accurate diagnoses is essential.

Mathias, C. G. Toby; Maibach, Howard I.

1982-01-01

331

Occupational lung cancer.  

PubMed

Lung cancer is a multifactorial disease. Hereditary, genetic, and environmental factors interact in its genesis. The principal risk factor for lung cancer is smoking. However, the workplace provides an environment in which there is a risk of exposure to carcinogens. The International Agency for Research on Cancer currently lists 19 substances/work situations/occupations that have been proven to be associated with lung cancer (group 1). Thorough occupational history taking is not widely practiced in patients with lung cancer, which has a negative impact on the investigation of causality and, consequently, on the identification of cases of occupational cancer. The objectives of this review were to list the agents that are recognized as causes of lung cancer, to discuss the contribution of occupation to the development of the disease, to cite national studies on the subject, and to propose a list of procedures that are essential to the appropriate investigation of causality between lung cancer and occupation. PMID:21225183

Algranti, Eduardo; Buschinelli, José Tarcísio Penteado; De Capitani, Eduardo Mello

332

Occupational Infection in Korea  

PubMed Central

Occupational infection is a human disease caused by work-associated exposure to microbial agents through human and environmental contact. According to the literature, occupational infection was the third leading cause of occupational disease (861 cases, 8.0%), and health care, agricultural, forestry, and fishery workers were risk groups in Korea. In addition, most high-risk groups have not been protected by workers' compensation, which could lead to underestimation of the exact spectrum and magnitude of the problem, and may also result in a lack of development and implementation of occupational infection management. Through a review of national guidelines and documentations on prevention and control of occupational infection, a management strategy would promote adherence to worker safety regulations if it is explicit with regard to the agent and mode of infection in each of the high-risk groups.

Ahn, Yeon-Soon; Jeong, Jae Sim

2010-01-01

333

Heavy flavors  

SciTech Connect

A range of issues pertaining to heavy flavors at the SSC is examined including heavy flavor production by gluon-gluon fusion and by shower evolution of gluon jets, flavor tagging, reconstruction of Higgs and W bosons, and the study of rare decays and CP violation in the B meson system. A specific detector for doing heavy flavor physics and tuned to this latter study at the SSC, the TASTER, is described. 36 refs., 10 figs.

Cox, B.; Gilman, F.J.; Gottschalk, T.D.

1986-11-01

334

Occupational Safety and Health Aspects of Voice and Speech Professions  

Microsoft Academic Search

A well-functioning voice is an essential tool for one third of the labour force. Vocal demands vary to a great extent between the different voice and speech professions. In professions with heavy vocal loading (e.g. school and kindergarten teachers), occupational voice disorders threatening working ability are common. Vocal loading is a combination of prolonged voice use and additional loading factors

Erkki Vilkman

2004-01-01

335

US to Lift Cuba Trade Embargo  

NSDL National Science Digital Library

For the first time in four decades, the United States will allow export sales of food and medicine to Cuba. This new agreement, which was drafted by House Republicans, will also allow the export of goods to formerly blacklisted countries including Lybia, North Korea, Sudan, and Iran. Unlike the other four countries, Cuba will not be allowed to export products to the US, nor will it be able to secure American private financing. In the first year after the new rulings go into effect, John Kavulich, president of the U.S.-Cuba Trade and Economic Council, has estimated that exports of American food products could reach between $25 million and $45 million. However the proposed bill has fallen short of the expectations of the Cuban government, which has demanded a complete lifting of the trade embargo. Cuban-American activists on both sides of the issues also find the proposal flawed, stating concerns including the lack of guarantee that the food and medicine will reach the Cubans who need the supplies the most.

Missner, Emily D.

336

Microfluidic particle sorting utilizing inertial lift force.  

PubMed

A simple passive microfluidic device that continuously separates microparticles is presented. Its development is motivated by the need for specific size micro perfluorocarbon (PFC) droplets to be used for a novel gas embolotherapy method. The device consists of a rectangular channel in which inertial lift forces are utilized to separate particles in lateral distance. At the entrance of the channel, particles are introduced at the center by focusing the flow from a center channel with flow from two side channels. Downstream, large particles will occupy a lateral equilibrium position in shorter axial distance than small particles. At the exit of the channel, flow containing large particles is separated from flow containing small particles. It is shown that 10.2-?m diameter microspheres can be separated from 3.0-?m diameter microspheres with a separation efficiency of 69-78% and a throughput in the order of 2 ·10? particles per minute. Computational Fluid Dynamics (CFD) calculations were done to calculate flow fields and verify theoretical particle trajectories. Theory underlying this research shows that higher separation efficiencies for very specific diameter cut-off are possible. This microfluidic channel design has a simple structure and can operate without external forces which makes it feasible for lab-on-a-chip (LOC) applications. PMID:20865451

Nieuwstadt, Harm A; Seda, Robinson; Li, David S; Fowlkes, J Brian; Bull, Joseph L

2011-02-01

337

Analysis of Stabilization Mechanisms in Lifted Flames  

NASA Astrophysics Data System (ADS)

Flame stabilization and the mechanisms that govern the dynamics at the flame base have been subject to numerous studies in recent years. Recent results using a combined Large Eddy Simulation-Conditional Moment Closure (LES-CMC) approach to model the turbulent flow field and the turbulence-chemistry interactions has been successful in predicting flame ignition and stabilization by auto-ignition, but LES-CMCs capability of the accurate modelling of the competition between turbulent quenching and laminar and turbulent flame propagation at the anchor point has not been resolved. This paper will consolidate LES-CMC results by analysing a wide range of lifted flame geometries with different prevailing stabilization mechanisms. The simulations allow a clear distinction of the prevailing stabilization mechanisms for the different flames, LES-CMC accurately predicts the competition between turbulence and chemistry during the auto-ignition process, however, the dynamics of the extinction process and turbulent flame propagation are not well captured. The averaging process inherent in the CMC methods does not allow for an instant response of the transported conditionally averaged reactive species to the changes in the flow conditions and any response of the scalars will therefore be delayed. Stationary or quasi-stationary conditions, however, can be well predicted for all flame configurations.

Navarro-Martinez, S.; Kronenburg, A.

2009-12-01

338

View northwest, wharf A, sheet steel bulkhead, steel lift tower ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northwest, wharf A, sheet steel bulkhead, steel lift tower - U.S. Coast Guard Sandy Hook Station, Western Docking Structure, West of intersection of Canfield Road & Hartshorne Drive, Highlands, Monmouth County, NJ

339

Interior detail of monitor and lift in north portion of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior detail of monitor and lift in north portion of attic; camera facing north. - Mare Island Naval Shipyard, Equipment & Recruitment Storehouse, Waterfront Avenue, northwest corner of Waterfront Avenue & Fifth Street, Vallejo, Solano County, CA

340

A simple and effective lift-off with positive photoresist  

NASA Astrophysics Data System (ADS)

This paper describes a simple and effective lift-off method which relies upon a single layer of positive photoresist and the insertion of a diffuser in the conventional lithography. The inserted diffuser randomizes the paths of incident ultraviolet light, which creates the re-entrant photoresist profile necessary for proper metal lift-off. This method was applied to photoresists, with different thicknesses from 1.3 µm to 10 µm, showing a uniform undercut of 0.3 µm to 2.0 µm, depending upon the photoresist thickness. The gold lift-off test was performed to show the suitability of the photoresist profile generated by the proposed method. We could obtain very neat gold sidewall patterns after evaporation onto the fabricated photoresist pattern. The simplicity and versatility of the proposed method will provide wider options for meeting the strong demands for a simple and effective lift-off method.

Lee, Hyung Suk; Yoon, Jun-Bo

2005-11-01

341

39. Second piece of formwork being readied for lifting into ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

39. Second piece of formwork being readied for lifting into place for arch rib at north abutment, view to northwest. - Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville, Yuba County, CA

342

HIV Patients Get a Mental Lift from Exercise, Study Finds  

MedlinePLUS

... JavaScript. HIV Patients Get a Mental Lift From Exercise, Study Finds Brain deficits half as likely in ... Preidt Friday, August 16, 2013 Related MedlinePlus Pages Exercise and Physical Fitness Living with HIV/AIDS FRIDAY, ...

343

4. DETAIL VIEW OF LIFTING GEAR ON MULE AND RACK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. DETAIL VIEW OF LIFTING GEAR ON MULE AND RACK ATTACHMENT BOOKS, LOOKING EAST - Nine Mile Hydroelectric Development, Powerhouse, State Highway 291 along Spokane River, Nine Mile Falls, Spokane County, WA

344

14. DETAIL VIEW OF PERSONNEL LIFT, INTERIOR, FOURTH FLOOR OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. DETAIL VIEW OF PERSONNEL LIFT, INTERIOR, FOURTH FLOOR OF MILL HOUSE, LOOKING SOUTHEAST - Sperry Corn Elevator Complex, Weber Avenue (North side), West of Edison Street, Stockton, San Joaquin County, CA

345

The synchronized coordinated control of tripartite hydraulic lifting platform  

Microsoft Academic Search

The hardware and software design of a tripartite hydraulic lifting platform control system is discussed in this paper, by which, the position of the platform can be controlled with high precision and its speed can be synchronized perfectly

Zhanming Li; Ruo-Zhu Chen; Juan Li

2000-01-01

346

75. Interior view of hydraulic lifts attached to above doors ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

75. Interior view of hydraulic lifts attached to above doors with escape ladder leading to above ground visible in background, pit "B", looking west - Nike Missile Battery MS-40, County Road No. 260, Farmington, Dakota County, MN

347

Transonic Equivalence Rule: A Nonlinear Problem Involving Lift.  

National Technical Information Service (NTIS)

The inviscid transonic flow past a thin wing having swept leading edges, with smooth lift and thickness distributions, is shown to possess an outer nonlinear structure determined principally by a line source and a line doublet. Three domains (the thicknes...

H. K. Cheng M. M. Hafez

1974-01-01

348

3. VIEW OF MOVEABLE SPAN IN LIFT POSITION, FROM SOUTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW OF MOVEABLE SPAN IN LIFT POSITION, FROM SOUTH SIDE OF RIVER LOOKING NORTHEAST. - Pennsylvania Railroad, South Branch Chicago River Bridge, Spanning South Branch of Chicago River Bridge east of Canal Street, Chicago, Cook County, IL

349

Development of Models for Prediction of Optimal Lifting Motion.  

National Technical Information Service (NTIS)

The angular movement of five human joints was simulated based on the invariant characteristics of manual lifting that are multidirectional and multiarticular and executed by large muscle groups generating within maximum torques. The study dealt with only ...

M. M. Ayoub

1991-01-01

350

Lifting Condensation Level and Its Relation to Convective Cloud Base.  

National Technical Information Service (NTIS)

This thesis explores the relationship between the lifting condensation level (LCL) and the height and time of convective cloud formation. Data collected from several different sources during the BLX83 field program is utilized. Sounding data is used to in...

N. P. Wilde

1984-01-01

351

11. AVALON DAM GATE KEEPER'S COMPLEX: PUMPHOUSE AND LIFT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. AVALON DAM - GATE KEEPER'S COMPLEX: PUMPHOUSE AND LIFT FOR HOUSE WATER SUPPLY. VIEW TO EAST - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

352

Back Injury Control Measures for Manual Lifting and Seat Design.  

National Technical Information Service (NTIS)

Development of more efficient supply-handling systems, innovative approaches to supply-handling problems, and proper design of manual lifting tasks can greatly reduce the risk of back pain, as can attention to proper design of seating. Engineering control...

A. Mayton S. Gallagher

2008-01-01

353

An ergonomics approach model to prevention of occupational musculoskeletal injuries.  

PubMed

The objective of this study was to prevent occupational musculoskeletal injuries. Our workers stacked boxes of ceramics weighing 10-27 kg, making low back pain common in our enterprise. In all the stacking stations, recommended weight limits (RWL) were separately calculated using the revised National Institute for Occupational Health lifting equation. Since the boxes weighed significantly more than the RWL, we developed a new ergonomic design that completely changed the stacking process. The load put on the workers' waist vertebrae in the new and the old stacking methods was compared to evaluate the success of the new ergonomic design, using Newton's third law of motion. Thanks to the new ergonomic design, the load on the workers' vertebrae decreased by 80%. Due to its simple technology and its very low cost compared to robots, the new ergonomic design can be commonly used in enterprises with repeated and constraining stacking. PMID:19272245

Koltan, Altan

2009-01-01

354

Design based on Pro\\/E for a hydraulic scissors lift platform  

Microsoft Academic Search

In this paper, a scissors lift platform is designed which with a wide range, the main platform, lift mechanism and the bottom. When lifting from low to high, the scissors posts, and the hydraulic cylinder layout multiple, mobile way will be changed. The scissors post number and cylinder layout depend on the lifting height needed. This paper is about a

Tian Hongyu; Liu Haiyang

2011-01-01

355

Research on Lift Control System of Single Wing Fin Stabilizer at Zero Speed  

Microsoft Academic Search

The technique is a kind of new concept of anti rolling ship at zero forward speed. It is different from conventional ship fin stabilizer that the lift of fin stabilizer based on movement mode of pitching and heaving is produced by initiative swing at zero speed. The lift control system is built according to lift feedback and lift limit. It

Hua Chunmei; Wang Yu; Li Man; Ding Shuyan; Yu Zongyan

2010-01-01

356

The Six Track Scherzer Rolling Lift Bridge?Two double track spans ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

The Six Track Scherzer Rolling Lift Bridge?Two double track spans closed. One double-track span open. Photocopy of plate xvi in Scherzer Rolling Lift Bridge Company, Scherzer Rolling Lift Bridges. - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

357

Impact of Order and Load Knowledge on Trunk Kinematics During Repeated Lifting Tasks  

Microsoft Academic Search

Objective: To determine if lifting random unknown weights is more detrimental than lifting sequences of unknown weights and to investigate whether load knowledge impacts the effect of lifting random box weights. Background: Much research has investigated lifting under known load conditions, but few studies have investigated unknown loads, especially when presented in random order. There has been some documentation of

Susan E. Kotowski; Kermit G. Davis; Kevin Shockley

2007-01-01

358

Spine loading as a function of lift frequency, exposure duration, and work experience  

Microsoft Academic Search

Background. Physiological and psychophysical studies of the effects of lifting frequency have focused on whole-body measurements of fatigue or subjective acceptance of the task and have not considered how spine loads may change as a function of lift frequency or lift time exposure. Our understanding of biomechanical spine loading has been extrapolated from short lifting bouts to the entire work

W. S. Marras; J. Parakkat; A. M. Chany; G. Yang; D. Burr; S. A. Lavender

2006-01-01

359

Significance of biomechanical and physiological variables during the determination of maximum acceptable weight of lift  

Microsoft Academic Search

The aim was to identify which biomechanical and physiological variables were associated with the decision to change the weight of lift during the determination of the maximum acceptable weight of lift (MAWL) in a psychophysical study. Fifteen male college students lifted a box of unknown weight at 4.3 lifts\\/min, and adjusted the weight until their MAWL was reached. Variables such

MICHAEL J. JORGENSEN; KERMIT G. DAVIS; BRYAN C. KIRKING; KAREN E. K. LEWIS; WILLIAM S. MARRAS

1999-01-01

360

Dynamic biomechanical modelling of symmetric and asymmetric lifting tasks in restricted postures  

Microsoft Academic Search

This article describes investigations of dynamic biomechanical stresses associated with lifting in stooping and kneeling postures. Twelve subjects volunteered to participate in two lifting experiments each having two levels of posture (stooped or kneeling), two levels of lifting height (350 or 700 mm), and three levels of weight (15,20, or 25 kg). One study examined sagitally symmetric lifting, the other

SEAN GALLAGHER; CHRISTOPHER A. HAMRICK; ARNOLD C. LOVE; WILLIAM S. MARRAS

1994-01-01

361

Signi® cance of biomechanical and physiological variables during the determination of maximum acceptable weight of lift  

Microsoft Academic Search

The aim was to identify which biomechanical and physiological variables were associated with the decision to change the weight of lift during the determination of the maximum acceptable weight of lift (MAWL) in a psychophysical study. Fifteen male college students lifted a box of unknown weight at 4.3 lifts\\/min, and adjusted the weight until their MAWL was reached. Variables such

MICHAEL J. JORGENSEN; KERMIT G. DAVIS; BRYAN C. KIRKING; KAREN E. K. LEWIS; WILLIAM S. MARRAS

362

The effect of stance width on trunk kinematics and trunk kinetics during sagitally symmetric lifting  

Microsoft Academic Search

Lifting technique can have a significant impact on spine loading during lifting. The sports biomechanics literature has documented changes in trunk and lower extremity kinematics and muscle coactivation patterns as a function of stance width during high force dead lift and squat exercises. The focus of the current study was to explore whether these lifting stance width effects might translate

Christopher J. Sorensen; Omid Haddad; Samuel Campbell; Gary A. Mirka

2011-01-01

363

Burnout in occupational therapists.  

PubMed

Burnout is a job-related condition involving feelings of emotional exhaustion, depersonalization, and reduced personal accomplishment. The Maslach Burnout Inventory (Maslach & Jackson, 1981a) is the instrument most widely used to measure job-related stress in human service professions, such as occupational therapy. This study explored the application of the Maslach Burnout Inventory for use with occupational therapists. The subjects were 99 registered occupational therapists residing in the southeastern United States. Mean scores lower than the aggregate occupational norms provided by the test's authors on the Emotional Exhaustion and Depersonalization subscales supported the need to develop specific norms for occupational therapists. Results of this study indicate that use of the aggregate norms would underestimate the level of experienced burnout. Correlational analyses delineated significant relationships between age and Emotional Exhaustion and Depersonalization, education and Emotional Exhaustion and Depersonalization, years of work as an occupational therapist and Depersonalization and Personal Accomplishment, years in the present position and Personal Accomplishment (intensity only), hours of direct patient contact and Emotional Exhaustion (intensity only), and hours of direct patient contact and Depersonalization (frequency only). These correlates of burnout furnish clues for understanding the development of work-related stress in occupational therapists. PMID:3223504

Rogers, J C; Dodson, S C

1988-12-01

364

Cosmetic face, neck, and brow lifts with local anesthesia.  

PubMed

The sections on the face, neck, and brow include descriptions of facelift, neck lift, and open brow lift techniques, anesthesia, treatment goals, procedural approaches, complications, management, preoperative and postoperative care, rehabilitation, recovery, and outcomes. The approach to facial rejuvenation the midface and periorbital area is detailed. These operations are often and easily performed entirely with the use of local anesthesia and mild oral sedation. There are very high satisfaction rates. PMID:24093659

Huq, Nasim S; Nakhooda, Tariq I

2013-10-01

365

Lift correlations from direct numerical simulation of solid liquid flow  

NASA Astrophysics Data System (ADS)

We studied the levitation of 300 particles in a Poiseuille flow and created a data bank which when plotted on a log-log plot give rise to straight lines. This is to say that lift results for fluidized slurries are power laws in appropriate dimensionless parameters. This shows that fluidization of slurries by lift also fall into enabling correlations of the Richardson-Zaki type. The method of correlations is a link between direct simulation and engineering application.

Joseph, Daniel D.; Patankar, Neelesh; Ko, T.; Choi, H.

2000-11-01

366

Weight lifting. Risks and injuries to the shoulder.  

PubMed

The weight lifter's desire to achieve higher limits of performance coupled with the rotator cuff's unfavorable position during lifting often leads to shoulder injury. Proper lifting techniques and training habits could reduce the risk of injury. When chronic symptoms occur, however, arthroscopy can help diagnose the injury, and arthroscopic procedures for injuries such as rotator cuff chronic tendinitis and incomplete tears, and biceps tenosynovitis can be performed. PMID:1868562

Neviaser, T J

1991-07-01

367

Design of lifting gear for a plastination laboratory.  

PubMed

Conventional lifting gear based on steel components can be safely used in a laboratory where acetone is used provided that: (a) the circumstances under which significant amounts of acetone vapour will be present are known and can be controlled and (b) operating practices are imposed to prevent the use of the lifting gear at times when acetone vapour may be present in explosive concentrations. PMID:9293293

Bore, P; Boyes, R; Dower, R

1997-01-01

368

Lift Enhancement Using Pulsed Blowing At Compressible Flow Conditions  

Microsoft Academic Search

Oscillatory wall-jets were introduced through spanwise slots along a NACA 0015 airfoil to establish lift augmentation by the unsteady forcing of the wall layer. Pressure coefficients, lift coefficients, and wake velocity profiles were measured for experiments where the oscillatory blowing momentum coefficient was held constant at various frequencies up to M=0.4. At high angles of attack, it was observed that

Michael Hites; Hassan Nagib; Brian Sytsma; Israel Wygnanski; Avi Seifert; Tomer Bachar

1997-01-01

369

NASA safety standard for lifting devices and equipment  

NASA Astrophysics Data System (ADS)

NASA's minimum safety requirements are established for the design, testing, inspection, maintenance, certification, and use of overhead and gantry cranes (including top running monorail, underhung, and jib cranes), mobile cranes, derrick hoists, and special hoist supported personnel lifting devices (these do not include elevators, ground supported personnel lifts, or powered platforms). Minimum requirements are also addressed for the testing, inspection, and use of Hydra-sets, hooks, and slings. Safety standards are thoroughly detailed.

1990-09-01

370

RF properties of epitaxial lift-off HEMT devices  

Microsoft Academic Search

Epitaxial layers containing GaAs HEMT and P-HEMT structures have been lifted off the GaAs substrate and attached to other host substrates using an AlAs parting layer. The devices were on-wafer RF probed before and after the lift-off step, showing no degradation in the measured S-parameters. The maximum stable gain indicates a low frequency enhancement of the gain of 1-2 dB

Paul G. Young; Samuel A. Alterovitz; Rafael A. Mena; Edwyn D. Smith

1993-01-01

371

CT gas lift captures last of field reserves  

SciTech Connect

Texaco Exploration and Production Inc.`s (TEPI) Brookeland Field in Newton County, Texas, produces from 30, mostly dual-horizontal, wells in the Austin Chalk reservoir. The wells are typically drilled vertically and casing is set to the top of the Austin Chalk at about 10,000 ft. Building at 15{degree}/100 ft, 4,000-ft laterals are drilled to the northwest and southeast to intersect the natural fractures of the Austin Chalk. The horizontal sections of the wellbore are openhole completions that average 700 b/d of oil and 5 MMcfd of gas. Within 1 year of initial production, the wells require compression to sustain flow and conventional gas lift is used when the wells load up with fluid. Typically, when production declines to 200 Mcfd and 100 b/d of fluid, the gas lift injection point is at 8,000 ft and average gas lift usage is 500 Mcfd. Coiled tubing-conveyed artificial lift was suggested, but first other concerns had to be addressed. The long, horizontal lateral sections functioned as a natural gas and fluid separator, resulting in a distinct slug flow pattern. During a 24-hour period, slug flow caused the wells to produce 100% gas or 100% fluid. For cost reasons TEPI chose conventional, field-installed coiled tubing (CT) gas lift equipment over spoolable equipment. Texaco then formed a team alliance with McMurry-Macco Lift Systems and Dowell to evaluate and complete trial wells with coiled tubing gas lift equipment. This paper reviews the case history of the field, the design considerations of the coiled tubing gas lift, and the surface support equipment used.

Tran, T.B.; Miller, J.; Woodell, M.E.; Johnson, H.

1996-06-01

372

Nonlinear wavelet transforms for image coding via lifting  

Microsoft Academic Search

We investigate central issues such as invertibility, stability, synchronization, and frequency characteris- tics for non-linear wavelet transforms built using the lifting framework. The non-linearity comes from adaptively choosing between a class of linear predictors within the lifting framework. We also describe how earlier families of non-linear filter banks can be extended through the use of prediction functions operating on a

Roger L. Claypoole Jr.; Geoffrey M. Davis; Wim Sweldens; Richard G. Baraniuk

2003-01-01

373

MPE and Partial Inversion in Lifted Probabilistic Variable Elimination  

Microsoft Academic Search

It is often convenient to represent probabilistic mod- els in a first-order fashion, using logical atoms such as partners(X,Y ) as random variables parameterized by log- ical variables. (de Salvo Braz, Amir, & Roth 2005), follow- ing (Poole 2003), give a lifted variable elimination algorithm (FOVE)for computing marginal probabilities from first-order probabilistic models (belief assessment, or BA). FOVE is lifted

Rodrigo De Salvo Braz; Eyal Amir; Dan Roth

2006-01-01

374

Motion Compensated Lifting Wavelet And Its Application In Video Coding  

Microsoft Academic Search

A motion compensated lifting (MCLIFT) framework is proposed for the 3D wavelet video coder. By using bi-directional motion compensation in each lifting step of the temporal direction, the video frames are effectively de-correlated. With proper entropy coding and bitstream packaging schemes, the MCLIFT wavelet video coder can be scalable in frame rate and quality level. Ex- perimental results show that

Lin Luo; Jin Li; Shipeng Li; Zhenquan Zhuang; Ya-qin Zhang

2001-01-01

375

Structures and Stability of Lifted Combustion Zones in Preheated Oxidizer  

NASA Astrophysics Data System (ADS)

The structures and stability of lifted combustion zones have been simulated with detailed chemistry and transport properties in an axisymmetric laminar fuel (CH4) jet and outer co-flow of the (O2+N2) oxidizer whose initial temperature is 300K, 700K and 1200K. A set of numerical simulations was executed by increasing the N2 dilution ratio, Z (mole fraction of N2 in the oxidizer). The results showed that at 300K, the lifted combustion zone had a triple flame structure where the rich premixed wing is smaller than the lean one and the trailing diffusion flame immediately inclined to the fuel side from the triple point as well as the leading edge of the triple flame was shifted away from the jet axis as Z increased. As the initial temperature increased, the combustion zones were lifted at larger Z values than the one at 300K. Especially, for 1200K, it was found that the lifted combustion zones, when expressed in terms of the heat release rate, have become so weak that a flameless triple combustion zone was formed due to the high dilution ratio and high preheat temperature. The numerical simulations on the response of the lifted triple combustion zone to the initial fuel velocity were also carried out, and the results showed that the lifted combustion zone using a high preheated temperature was very stable in the near field.

Ruan, Jiongming; Kobayashi, Hideaki; Niioka, Takashi; Abuliti, Abudula; Iida, Fumio

376

FEB (Multifilter Electronics Box) lifting device analysis, revision A  

NASA Astrophysics Data System (ADS)

This document is to determine the mechanical loads produced when the FEB is either lifted manually with handles or by a sling and overhead hoist. 2. Relevant Documents 2.1 JA418 2.2 ES-MAS-DS-003 MAS Ground Support Equipment Specification 2.3 An Introduction to the Design and Behavior of Bolted Joints John H. Bickford, MARCEL DEKKER, New York 3. Lifting Apparatus 3.1 For the lifting of FEB by either handles or a sling from an overhead hoist, four eyebolts are attached to the top mounting edge, through the top cover and into the top flange of the sidewalls. When the FEB is to be lifted manually without mechanical assistance, two long stainless steel rods are inserted lengthwise through the upright eyebolts. A small collar is then slipped over the rod so that the rod cannot shift lengthwise. The rod ends which extend beyond the eyebolt positions serve as handles for two people to lift the FEB. When an overhead hoist is to be used, the rods are not used. Instead a wire-rope sling is attached to each eyebolt. The four sling arms meet at a center jump ring which is lifted by the hook of the overhead crane. A spreader frame is used just above the eye-bolt attachments so that the load transfered to the bolts is strictly vertical.

Croskey, Charles L.

1988-02-01

377

Interjoint coordination and the personal lift-assist device.  

PubMed

It has been suggested that interjoint coordination may serve to reduce joint stress and muscular demand and to maintain balance during dynamic lifting tasks, thus having implications for safe lifting practices. Before recommending the use of an on-body ergonomic aid, the Personal Lift-Assist Device (PLAD), it is important to determine any effects this device may have on interjoint coordination. Principal component analyses were applied to relative phase angle waveforms, defining the hip-knee and lumbar spine-hip coordination of 15 males and 15 females during a repetitive lifting task. When wearing the PLAD, users lifted with more synchronous hip-knee and lumbar spine-hip coordination patterns (P < .01). Furthermore, increases in load caused less synchronized interjoint coordination at both the hip-knee and lumbar spine-hip during the up and down phases of the lift (P < .01) for all conditions. No significant main effects of sex or significant interactions were observed on any of the outcome variables. PMID:22813833

Graham, Ryan B; Smallman, Catherine L W; Sadler, Erin M; Stevenson, Joan M

2012-07-06

378

Corrosion control of gas-lift well tubulars by continuous inhibitor injection into the gas-lift gas stream  

Microsoft Academic Search

Two treating systems have been developed to provide corrosion control of gas-lift well tubulars by continuously injecting corrosion inhibitor into the gas-lift gas stream. These systems employ an oil-soluble organic corrosion inhibitor injected at rates necessary for effective inhibition of individual wells, as determined by analysis of well production and iron loss data. Control of the inhibitor amount injected into

D. H. Mutti; J. E. Atwood; C. R. LaFayette; A. O. Landrum

1975-01-01

379

Paternal occupation and anencephaly  

SciTech Connect

It has been suggested that paternal occupational exposures to pesticides and solvents increase the risk of neural tube defects in offspring. With the use of Texas livebirth, fetal death, and linked livebirth-death records, the authors conducted a population-based case-control study among 1981-1986 Texas births to examine the association between paternal occupation and anencephalic births. Fathers employed in occupations associated with solvent exposure were more likely to have offspring with anencephaly (odds ratio (OR) = 2.53), with painters having the highest risk (OR = 3.43). A lesser association was found for fathers employed in occupations involving pesticide exposure (OR = 1.28). Further studies are indicated to clarify these associations.

Brender, J.D.; Suarez, L. (Texas Department of Health, Austin (USA))

1990-03-01

380

Occupational Peripheral Neuropathies  

PubMed Central

Neither clinical nor laboratory evaluation can distinguish occupational neuropathies from neuropathies due to other causes. A worker may suffer either from mechanical injury of individual nerves or from a toxic polyneuropathy that is usually axonal in type. A thorough occupational and environmental history and the recognition of clusters of cases are important in determining the diagnosis. Electrophysiologic studies are helpful in detecting neuropathies in patients who have been occupationally exposed to neurotoxins but have no symptoms. Prevention of occupational neuropathies depends on clinical vigilance, industrial hygiene surveys, biologic monitoring and periodic examination of workers exposed to neurotoxic chemicals. The development of more sophisticated methods of prevention and early detection of peripheral nerve involvement depend on understanding the mechanisms of action of toxins and the pathophysiology of the lesions they cause.

Lotti, Marcello; Becker, Charles E.; Aminoff, Michael J.

1982-01-01

381

Respiratory Symptoms and Occupational Dust Exposure In US Veterans  

PubMed Central

PROBLEM Occupational exposure to organic and inorganic dusts may result in symptoms of chronic respiratory disease. METHOD To investigate the utility of obtaining a history of occupational exposure to dust in US veterans, a respiratory health survey was conducted between 1988 and 1992. They were asked for history of cough, phlegm, and wheeze, and occupational dust exposures Information on cigarette use and other possible confounders was also obtained. RESULTS In 2,617 white males, after adjusting for cigarette smoking, age, distance to the nearest major roadway, and chronic respiratory disease, there was an overall 2-fold increased risk of all three respiratory symptoms attributable to occupational dust exposure. The odds ratio (OR) increased based on exposure intensity. CONCLUSIONS After considering possible confounders, dust exposure was associated with respiratory symptoms, with the greatest risk attributable to heavy intensity exposure.

Garshick, Eric; Laden, Francine; Hart, Jaime; Moy, Marilyn L.

2007-01-01

382

Occupational Contact Dermatitis: Hairdressers  

Microsoft Academic Search

\\u000a Occupational contact dermatitis occurs in about half of all hairdressers and makes hairdressers susceptible to most skin diseases.\\u000a The clinical manifestations are typically seen as hand eczema. The hand eczema starts often at the time of hairdressing apprenticeship,\\u000a and protective gloves are very important for preventing eczema in this occupation. Persulfates are (almost) always used in\\u000a bleaching procedures in hairdressing

Heidi Søsted

383

Occupant thermal comfort evaluation  

NASA Astrophysics Data System (ADS)

Throughout the automotive industry there has been an increasing concern and focus on the thermal comfort of occupants. Manufacturers are continuously striving to improve heating and air conditioning performance to comply with expanding customer needs. To optimize these systems, the technology to acquire data must also be enhanced. In this evaluation, the standard use of isolated thermocouple location technology is compared to utilizing infrared thermal vision in an air conditioning performance assessment. Infrared data on an actual occupant is correlated to breath and air conditioning output temperatures measured by positioned thermocouples. The use of infrared thermal vision highlights various areas of comfort and discomfort experienced by the occupant. The evaluation involves utilizing an infrared thermal vision camera to film an occupant in the vehicle as the following test procedure is run. The vehicle is soaked in full sun load until the interior temperature reaches a minimum of 150 degrees F (65.6 degrees Celsius). The occupant enters the vehicle and takes an initial temperature reading. The air conditioning is turned on to full cold, full fan speed, and recirculation mode. While being filmed, the driver drives for sixty minutes at 30 miles per hour (48.3 kph). The thermocouples acquire data in one minute intervals while the infrared camera films the cooling process of the occupant.

Ghiardi, Gena L.

1999-03-01

384

Occupational health in Brazil.  

PubMed

Brazil is a recently industrialised country with marked contrasts in social and economic development. The availability of public/private services in its different regions also varies. Health indicators follow these trends. Occupational health is a vast new field, as in other developing countries. Occupational medicine is a required subject in graduation courses for physicians. Specialisation courses for university graduated professionals have more than 700 hours of lectures and train occupational health physicians, safety engineers and nursing staff. At the technical level, there are courses with up to 1300 hours for the training of safety inspectors. Until 1986 about 19,000 occupational health physicians, 18,000 safety engineers and 51,000 safety inspectors had been officially registered. Although in its infancy, postgraduation has attracted professionals at university level, through residence programmes as well as masters and doctors degrees, whereby at least a hundred good-quality research studies have been produced so far. Occupational health activities are controlled by law. Undertakings with higher risks and larger number of employees are required to hire specialised technical staff. In 1995 the Ministry of Labour demanded programmes of medical control of occupational health (PCMSO) for every worker as well as a programme of prevention of environmental hazards (PPRA). This was considered as a positive measure for the improvement of working conditions and health at work. Physicians specialising in occupational medicine are the professionals more often hired by the enterprises. Reference centres (CRSTs) for workers' health are connected to the State or City Health Secretariat primary health care units. They exist in more populated areas and are accepted by workers as the best way to accomplish the diagnosis of occupational diseases. There is important participation by the trade unions in the management of these reference centres. For 30 years now employers organisations have also kept specialised services for safety and occupational health. Although they are better equipped they are less well used by the workers than the CRSTs. At the federal level, activities concerned with occupational health are connected to three ministries: Labour, Health and Social Security. The Ministry of Labour enacts legislation on hygiene, safety and occupational medicine, performs inspections through its regional units and runs a number of research projects. The Ministry of Health provides medical care for workers injured or affected by occupational diseases and also has surveillance programmes for certain occupational diseases. The Ministry of Social Security provides rehabilitation and compensation for registered workers. In spite of a decrease in the number of accidents at work during the past 25 years, working conditions have not improved. Changes in the laws of social security in the 1970s discouraged registration and reporting of occupational injuries and diseases. In consequence death rates due to accidents increased. With the implementation of the CRSTs, the recorded incidence of occupational diseases has risen, not only because of improved diagnosis, but also because of stronger pressure from the unions and better organisation of public services and enterprises. PMID:9342620

Bedrikow, B; Algranti, E; Buschinelli, J T; Morrone, L C

1997-01-01

385

A biomechanical comparison of lifting techniques between subjects with and without chronic low back pain during freestyle lifting and lowering tasks  

Microsoft Academic Search

Objective. To evaluate if chronic low back pain patients perform manual material handling tasks differently from control subjects.Design. Comparative study using a repeated measures design.Background. No study evaluated the lifting technique of back pain patients relative to control subjects during free style lifting and lowering tasks. Previous findings suggest that lowering would be more hazardous than lifting to the low

Christian Larivière; Denis Gagnon; Patrick Loisel

2002-01-01

386

Heavy periodane.  

PubMed

The potential energy surface of the hypothetical NaMgAlSiPSCl system (heavy periodane) is exhaustively analyzed via the gradient embedded genetic algorithm (GEGA) in combination with density functional theory (DFT) computations. The electronegativity differences among the elements in both the second and third rows of the periodic table indicate that low-energy heavy periodane structures are obtained when highly electronegative and electropositive elements are bound together, but the global minimum of the heavy periodane system is completely different to its second-row analog (LiBeBCNOF). PMID:22903586

Azpiroz, Jon M; Moreno, Diego; Ramirez-Manzanares, Alonso; Ugalde, Jesus M; Mendez-Rojas, Miguel Angel; Merino, Gabriel

2012-08-19

387

Sentinel Event Notification System for Occupational Risks (SENSOR): Recommendations for control of silica exposure at Woodbridge Sanitary Pottery Corporation, Woodbridge, New Jersey  

SciTech Connect

An in-depth survey of exposure to silica dust at the Woodbridge Sanitary Pottery Corporation, Woodbridge, New Jersey was conducted as a part of the Sentinel Event Notification System for Occupational Risks (SENSOR) cooperative effort. The facility manufactured vitreous china products, including toilet bowls and lavatories. Personal and area atmospheric sampling showed that personal exposure to respirable crystalline silica dust ranged from 0.12 to 0.18 mg/m{sup 3} with at least half the samples exceeding the NIOSH recommended exposure limit of 0.05 mg/m{sup 3} for crystalline silica. The workers in the Slip House suffered the highest exposures, where area concentrations averaged 0.38 mg/m{sup 3}. Of the other three areas, casting, glaze spraying, and glaze preparation, the highest personal exposures were in the glaze-spraying areas where 67% of the personal samples exceeded the OSHA permissible exposure limits for respirable dust. Ergonomic evaluations were conducted to determine lifting hazards at several workstations. The authors conclude that there were excessive exposures to respirable silica dust and respirable dust. There was also a high risk of lost time in injuries from manual handling of heavy loads. Improvements should be made in the design and maintenance of ventilation control systems, work stations, and work practices.

Caplan, P.E.; Valiante, D.; Cooper, T.C.; Crouch, K.G.; Gideon, J.A.

1989-06-01

388

A comparative study of DRL-lift and lift on integrated polyisobutylene polymer matrices  

NASA Astrophysics Data System (ADS)

This paper presents a comparative study of polymer pixel on sensors obtained by Laser Induced Forward Transfer (LIFT) assisted by a triazene polymer as Dynamic Release Layer (DRL). Polyisobutylene (PIB) was selected as model for chemoselective polymers which could be used as hydrogen-bond acidic polymer for vapor sensors. PIB films deposited on fused silica, respectively, on triazene polymer coated fused silica substrates were used as targets. Both targets were prepared by Matrix Assisted Pulsed Laser Evaporation (MAPLE). The parameters related to a regular, well-defined transfer were analyzed and compared for the substrates with and without the DRL. The morphological characterization of the transferred PIB was performed by Atomic Force Microscopy (AFM), Optical Microscopy, and Scanning Electron Microscopy (SEM). It was found that a minimal thickness of the dynamic release layer, i.e. 100 nm is required to protect the sensitive PIB polymer in a clean laser transfer process.

Dinca, V.; Palla Papavlu, A.; Matei, A.; Luculescu, C.; Dinescu, M.; Lippert, T.; di Pietrantonio, F.; Cannata, D.; Benetti, M.; Verona, E.

2010-11-01

389

A simplified palatal lift prosthesis for neurogenic velopharyngeal incompetence.  

PubMed

Velopharyngeal incompetence is a contributing factor to speech disorders and implies the presence of hypernasality, inappropriate nasal escape, and decreased air pressure during speech. One prosthetic treatment is a rehabilitative procedure employing a palatal lift prosthesis (PLP), which reduces hypernasality by approximating the incompetent soft palate to the posterior pharyngeal wall and consists of two parts, the anterior denture base and the palatal lifting plate, which are connected with steel wires; however, it seems difficult to reproduce the mobility of the soft palate in speaking, and it is therefore likely that the palatal lifting plate stimulates or oppresses the tissue of the soft palate and hinders rather than assists articulatory function. To avoid these disturbances we devised an adjustable PLP with a flexible conjunction between the denture base and the palatal lifting plate to obtain the optimal vertical lifting angle. The palatal plate was adapted to conform in a passive manner to the soft palate with light-cured resin. The designed PLP simplified the procedure and reduced the number of adjustments and visits. PMID:23387878

Rilo, Benito; Fernández-Formoso, Noelia; da Silva, Luis; Pinho, Joâo Carlos

2013-02-06

390

The mechanisms of lift enhancement in insect flight  

NASA Astrophysics Data System (ADS)

Recent studies have revealed a diverse array of fluid dynamic phenomena that enhance lift production during flapping insect flight. Physical and analytical models of oscillating wings have demonstrated that a prominent vortex attached to the wing's leading edge augments lift production throughout the translational parts of the stroke cycle, whereas aerodynamic circulation due to wing rotation, and possibly momentum transfer due to a recovery of wake energy, may increase lift at the end of each half stroke. Compared to the predictions derived from conventional steady-state aerodynamic theory, these unsteady aerodynamic mechanisms may account for the majority of total lift produced by a flying insect. In addition to contributing to the lift required to keep the insect aloft, manipulation of the translational and rotational aerodynamic mechanisms may provide a potent means by which a flying animal can modulate direction and magnitude of flight forces for manoeuvring flight control and steering behaviour. The attainment of flight, including the ability to control aerodynamic forces by the neuromuscular system, is a classic paradigm of the remarkable adaptability that flying insects have for utilising the principles of unsteady fluid dynamics. Applying these principles to biology broadens our understanding of how the diverse patterns of wing motion displayed by the different insect species have been developed throughout their long evolutionary history.

Lehmann, Fritz-Olaf

391

Efficient architecture for adaptive directional lifting-based wavelet transform  

NASA Astrophysics Data System (ADS)

Adaptive direction lifting-based wavelet transform (ADL) has better performance than conventional lifting both in image compression and de-noising. However, no architecture has been proposed to hardware implement it because of its high computational complexity and huge internal memory requirements. In this paper, we propose a four-stage pipelined architecture for 2 Dimensional (2D) ADL with fast computation and high data throughput. The proposed architecture comprises column direction estimation, column lifting, row direction estimation and row lifting which are performed in parallel in a pipeline mode. Since the column processed data is transposed, the row processor can reuse the column processor which can decrease the design complexity. In the lifting step, predict and update are also performed in parallel. For an 8×8 image sub-block, the proposed architecture can finish the ADL forward transform within 78 clock cycles. The architecture is implemented on Xilinx Virtex5 device on which the frequency can achieve 367 MHz. The processed time is 212.5 ns, which can meet the request of real-time system.

Yin, Zan; Zhang, Li; Shi, Guangming

2010-07-01

392

Image fusion using lifting wavelet transform with human visual features  

NASA Astrophysics Data System (ADS)

We focus on the method of image registration and fusion and introduce all kinds of existing registration and fusion algorithm based on lifting wavelet in detail in this paper. Based on the characteristics of the infrared and visible images, this paper presents a registration approach using lifting wavelet transform to extract edge feature points, and improve the fusion algorithm based on features of human vision system (HVS). The methods refer much other knowledge such as lifting scheme, edge detection, affine transformation, HVS and fusion rules. A fast multi-resolution image fusion method based on visual features for infrared and visible images is proposed in this paper. The source images are decomposed using CDF9/7 lifting wavelet transform, respectively. Then it calculated the visual features of each sub-image and chose the different rule of fusion based on visual features. Finally, a fused image is reconstructed by using inverse lifting wavelet transform. Experimental results demonstrate that the proposed method has apparent advantage in information preservation and resolution even if the source images have low signal to noise ratio (SNR), and the algorithm is more effective in computational speed.

Gu, Xiaobo; Peng, Zhenming; Chen, Zhiwei; Yuan, Lin; Huang, Bingquan

2010-11-01

393

Toward a new nanoLIFT transfer process  

SciTech Connect

The Laser Induced Forward Transfer (LIFT) is a direct-write technique used to print biological materials such as living cells or molecules. During the LIFT process, the biomaterial to be printed is deposited on a target submitted to a nanosecond laser shot, and the ejecta are collected onto a receiving substrate. Despite the several advantages of this technique (control of the propelled quantity, no spoiling of the substrate), it remains difficult to be employed due to the high sensitivity of its control parameters. Recently, Duocastella published some experimental results which exhibit the real-time jet formation process, under conditions similar to those present in the LIFT process. In the first Section, a typical experimental setup for LIFT process is presented. Then, simulations of Duocastella's and Guillemot's experiments are carried out to model the jet formation in water when irradiated by an ultraviolet nanosecond laser pulse. The 2D axisymmetric hydrodynamic code CHIC (Code d'Hydrodynamique et d'Implosion du CELIA) is used for these simulations with included equations of state (EOS) to take into account the behavior of water under standard conditions. Finally, an improvement of the LIFT technique which consists in using femtosecond lasers instead of nanosecond ones, is presented. It would allow to process smaller bioelements and to control the jet diameter, as it is directly related to the laser beam waist.

Mezel, C.; Hallo, L.; Breil, J. [CELIA, Universite Bordeaux 1 (France); Souquet, A.; Guillemot, F. [UMR 577 INSERM, Universite Bordeaux 2 (France); Bourgeade, A.; Hebert, D. [CEA-CESTA, Le Barp (France); Saut, O. [IMB, Universite Bordeaux 1 (France)

2010-02-02

394

A dynamic plunger-lift model for gas wells  

SciTech Connect

A free piston or plunger traveling up and down the tubing has been used for different applications in oil and gas production for decades. Its most widespread use is in conventional plunger lift, which is an artificial-lift technique characterized by use of reservoir energy stored in the gas phase to lift fluids to the surface. The plunger acts as an interface between the liquid slug and the gas to keep the ballistic-shaped flow pattern of the higher-velocity gas phase from breaking through the liquid phase during production. Several authors have modeled plunger-lift installations. Static models have been proposed and are widely accepted. Dynamic models also have been published to describe the phenomenon of a plunger-lift cycle. The dynamic model developed in the full-length paper overcomes some of the assumptions used in previous models. It includes reservoir performance, gas expansion with friction effects, and the transient behavior of the gas above the liquid slug when the surface valve is opened. It also includes a blow-down or afterflow period for production after the liquid slug surfaces. The upstroke model includes a transition phase that describes the production of the slug into the flowline.

NONE

1998-07-01

395

Sorting and recycling of domestic waste. Review of occupational health problems and their possible causes.  

PubMed

In order to reduce the strain on the environment from the deposition of waste in landfills and combustion at incineration plants, several governments throughout the industrialized world have planned greatly increased recycling of domestic waste by the turn of the millennium. To implement the plans, new waste recycling facilities are to be built and the number of workers involved in waste sorting and recycling will increase steadily during the next decade. Several studies have reinforced the hypothesis that exposure to airborne microorganisms and the toxic products thereof are important factors causing a multitude of health problems among workers at waste sorting and recycling plants. Workers at transfer stations, landfills and incineration plants may experience an increased risk of pulmonary disorders and gastrointestinal problems. High concentrations of total airborne dust, bacteria, faecal coliform bacteria and fungal spores have been reported. The concentrations are considered to be sufficiently high to cause adverse health effects. In addition, a high incidence of lower back injuries, probably due to heavy lifting during work, has been reported among workers at landfills and incineration plants. Workers involved in manual sorting of unseparated domestic waste, as well as workers at compost plants experience more or less frequent symptoms of organic dust toxic syndrome (ODTS) (cough, chest-tightness, dyspnoea, influenza-like symptoms such as chills, fever, muscle ache, joint pain, fatigue and headache), gastrointestinal problems such as nausea and diarrhoea, irritation of the skin, eye and mucous membranes of the nose and upper airways, etc. In addition cases of severe occupational pulmonary diseases (asthma, alveolitis, bronchitis) have been reported. Manual sorting of unseparated domestic waste may be associated with exposures to large quantities of airborne bacteria and endotoxin. Several work functions in compost plants can result in very high exposure to airborne fungal spores and thermophilic actinomycetes. At plants sorting separated domestic waste, e.g. the combustible fraction of waste composed of paper, cardboard and plastics, the workers may have an increased risk of gastrointestinal symptoms and irritation of the eyes and skin. At such plants the bioaerosol exposure levels are in general low, but at some work tasks, e.g. manual sorting and work near the balers, exposure levels may occasionally be high enough to be potentially harmful. Workers handling the source-sorted paper or cardboard fraction do not appear to have an elevated risk of occupational health problems related to bioaerosol exposure, and the bioaerosol exposure is generally low.(ABSTRACT TRUNCATED AT 400 WORDS) PMID:7610383

Poulsen, O M; Breum, N O; Ebbehøj, N; Hansen, A M; Ivens, U I; van Lelieveld, D; Malmros, P; Matthiasen, L; Nielsen, B H; Nielsen, E M

1995-05-19

396

Influence of weight and frequency on thigh and lower-trunk motion during repetitive lifting employing stoop and squat techniques  

Microsoft Academic Search

Changes in kinematics as a function of lifting weight and frequency was investigated in sagittal symmetric repetitive lifting. For every lift cycle (lowering and lifting) the motion range between the upright position (0 °) and the maximum angular displacement of the thigh and lower-trunk body segments was recorded. Ten subjects performed five repetitive lifting bouts with different weight\\/frequency combinations, using

KB Hagen; O Sørhagen; K Harms-Ringdahl

1995-01-01

397

Construction of arbitrary dimensional biorthogonal multiwavelet using lifting scheme.  

PubMed

This paper focuses on the construction of multidimensional biorthogonal multiwavelets and the perfect reconstruction multifilter banks. Based on the Hermite-Neville filter, two lifting structures have been proposed and systematically investigated, and a general design framework has been developed for building biorthogonal multiwavelets and Hermite interpolation filter banks with any multiplicity for any lattice in any dimension with any number of primal and dual vanishing moments. The construction is an important generalization of the Neville-based lifting scheme and inherits all of the advantages of lifting schemes such as fast transform, in-place computation and integer-to-integer transforms. Our multiwavelet systems preserve most of the desirable properties for applications, such as interpolating, short support, symmetry, and high vanishing moments. PMID:19342334

Gao, Xieping; Xiao, Fen; Li, Bodong

2009-05-01

398

Influences of Lorentz force on the hydrofoil lift  

NASA Astrophysics Data System (ADS)

In this paper, Lorentz forces are proved to be able to suppress separation in flows over hydrofoils. Furthermore, a differential equation of pressure distributions on the hydrofoil surface is derived, from which it is found that BVF (boundary vortex flux) ? is a suitable criterion for describing the lift coefficient variations during the electromagnetic control process. According to our numerical results, the periodic variations of lift for a hydrofoil at an attack angle of 17 ? are analyzed and its inherent mechanism is discussed in detail with the concept of BVF. On the other hand, the effects of Lorentz force on the hydrofoil’s lift are investigated both experimentally and numerically for different magnitudes and locations.

Chen, Yaohui; Fan, Baochun; Chen, Zhihua; Li, Hongzhi

2009-10-01

399

Occupational asthma in Korea.  

PubMed

Occupational asthma (OA) is the leading occupational respiratory disease. Cases compensated as OA by the Korea Workers' Compensation and Welfare Service (COMWEL) (218 cases), cases reported by a surveillance system (286 cases), case reports by related scientific journals and cases confirmed by the Occupational Safety and Health Research Institute (OSHRI) over 15 yr from 1992 to 2006 were analyzed. Annual mean incidence rate was 1.6 by compensation and 3.5 by surveillance system, respectively. The trend appeared to increase according to the surveillance system. Incidence was very low compared with other countries. The most frequently reported causative agent was isocyanate followed by reactive dye in dyeing factories. Other chemicals, metals and dust were also found as causative agents. OA was underreported according to compensation and surveillance system data. In conclusion, a more effective surveillance system is needed to evaluate OA causes and distribution, and to effectively prevent newly developing OA. PMID:21258586

Oh, Sung Soo; Kim, Kyoo Sang

2010-12-15

400

Occupation and gastric cancer.  

PubMed

Gastric cancer is a cause of significant morbidity and mortality. There are several risk factors, with occupation emerging as one of these. There is considerable evidence that occupations in coal and tin mining, metal processing, particularly steel and iron, and rubber manufacturing industries lead to an increased risk of gastric cancer. Other "dusty" occupations-for example, wood processing, or work in high temperature environments have also been implicated but the evidence is not strong. The mechanism of pathogenesis of gastric cancer is unclear and the identification of causative agents can be difficult. Dust is thought to be a contributor to the pathological process, but well known carcinogens such as N-nitroso compounds have been detected in some environments. Further research on responsible agents is necessary and screening for detection of precursor gastric cancer lesions at the workplace merits consideration. PMID:12782770

Raj, A; Mayberry, J F; Podas, T

2003-05-01

401

Occupational lung cancer  

SciTech Connect

The overall importance of occupational agents as a cause of lung cancer has been a controversial subject since the 1970s. A federal report, released in the late 1970s, projected a surprisingly high burden of occupational lung cancer; for asbestos and four other agents, from 61,000 to 98,000 cases annually were attributed to these agents alone. Many estimates followed, some much more conservative. For example, Doll and Peto estimated that 15% of lung cancer in men and 5% in women could be attributed to occupational exposures. A number of population-based case-control studies also provide relevant estimates. In a recent literature review, Vineis and Simonato cited attributable risk estimates for occupation and lung cancer that ranged from 4% to 40%; for asbestos alone, the estimates ranged from 1% to 5%. These estimates would be expected to vary across locations and over time. Nevertheless, these recent estimates indicate that occupation remains an important cause of lung cancer. Approaches to Prevention. Prevention of lung cancer mortality among workers exposed to agents or industrial processes that cause lung cancer may involve several strategies, including eliminating or reducing exposures, smoking cessation, screening, and chemo-prevention. For example, changes in industrial processes that have eliminated or reduced exposures to chloromethyl ethers and nickel compounds have provided evidence of reduced risk of lung cancer following these changes. Although occupational exposures are important causes of lung cancer, cigarette smoking is the most important preventable cause of lung cancer. For adults, the work site offers an important location to target smoking cessation efforts. In fact, the work site may be the only place to reach many smokers.

Coultas, D.B.; Samet, J.M. (Department of Medicine, University of New Mexico School of Medicine, Albuquerque (United States))

1992-06-01

402

[Occupational allergies to bromelain].  

PubMed

The protease bromelain originating from the pineapple fruit (Ananas comosus) finds frequent use in industry. Exposure to enzyme dusts has long been known to cause occupational allergies. The present paper reviews the results of the evaluation of literature data concerning occupational airway sensitization due to bromelain. Cases of specific airway sensitization caused by bromelain could be shown clearly by the presented studies. Since the symptoms, results of skin prick tests, detection of specific IgE antibodies and results of specific bronchoprovocation tests are consistent, an immunological mechanism can be assumed. PMID:17342576

van Kampen, V; Merget, R; Brüning, T

2007-03-01

403

A current global view of environmental and occupational cancers.  

PubMed

This review is focused on current information of avoidable environmental pollution and occupational exposure as causes of cancer. Approximately 2% to 8% of all cancers are thought to be due to occupation. In addition, occupational and environmental cancers have their own characteristics, e.g., specific chemicals and cancers, multiple factors, multiple causation and interaction, or latency period. Concerning carcinogens, asbestos/silica/wood dust, soot/polycyclic aromatic hydrocarbons [benzo(a) pyrene], heavy metals (arsenic, chromium, nickel), aromatic amines (4-aminobiphenyl, benzidine), organic solvents (benzene or vinyl chloride), radiation/radon, or indoor pollutants (formaldehyde, tobacco smoking) are mentioned with their specific cancers, e.g., lung, skin, and bladder cancers, mesothelioma or leukemia, and exposure routes, rubber or pigment manufacturing, textile, painting, insulation, mining, and so on. In addition, nanoparticles, electromagnetic waves, and climate changes are suspected as future carcinogenic sources. Moreover, the aspects of environmental and occupational cancers are quite different between developing and developed countries. The recent follow-up of occupational cancers in Nordic countries shows a good example for developed countries. On the other hand, newly industrializing countries face an increased burden of occupational and environmental cancers. Developing countries are particularly suffering from preventable cancers in mining, agriculture, or industries without proper implication of safety regulations. Therefore, industrialized countries are expected to educate and provide support for developing countries. In addition, citizens can encounter new environmental and occupational carcinogen nominators such as nanomaterials, electromagnetic wave, and climate exchanges. As their carcinogenicity or involvement in carcinogenesis is not clearly unknown, proper consideration for them should be taken into account. For these purposes, new technologies with a balance of environment and gene are required. Currently, various approaches with advanced technologies--genomics, exposomics, etc.--have accelerated development of new biomarkers for biological monitoring of occupational and environmental carcinogens. These advanced approaches are promising to improve quality of life and to prevent occupational and environmental cancers. PMID:21929381

Yang, Mihi

2011-07-01

404

Aerodynamic development of a lifting body launch vehicle  

SciTech Connect

The Lockheed Martin Reusable Launch Vehicle (RLV) and X-33 demonstrator vehicle incorporate a lifting body aerodynamic design. This design originated from the X-24, HL-20 and ACRV lifting body database. It evolved rapidly through successive wind tunnel tests using stereolithography generated plastic models and rapid data acquisition and analysis. The culmination of this work is a configuration that is close to meeting a goal of at least neutral stability about all axes throughout the operating Mach spectrum. The development process and aerodynamic evolution are described. {copyright} {ital 1997 American Institute of Physics.}

Reaser, J.S. [Lockheed Martin Skunk Works 1011 Lockheed Way Palmdale, California93599 (United States)

1997-01-01

405

LiFTinG: Lightweight Freerider-Tracking in Gossip  

Microsoft Academic Search

\\u000a This paper presents LiFTinG, the first protocol to detect freeriders, including colluding ones, in gossip-based content dissemination systems with asymmetric\\u000a data exchanges. LiFTinG relies on nodes tracking abnormal behaviors by cross-checking the history of their previous interactions, and exploits the\\u000a fact that nodes pick neighbors at random to prevent colluding nodes from covering up each others’ bad actions.\\u000a \\u000a \\u000a We present

Rachid Guerraoui; Kévin Huguenin; Anne-Marie Kermarrec; Maxime Monod; Swagatika Prusty

2010-01-01

406

Control of Variable Valve Lift Engine by Nonlinear MPC  

NASA Astrophysics Data System (ADS)

In this study, we purpose a control system of engine torque for a V6 spark ignition engine with a variable valve lift system. We apply a nonlinear receding horizon control to a benchmark problem where we assume that the control inputs are throttle angle, variable valve lift and ignition timing. Moreover, a fuel injection control is also developed by estimating the amount of air in the engine. We propose a vehicle speed tracking control by defining time derivative of input as new input and dealing with input constraint by transformation of input variables. Finally, we show some numerical simulation results to verify the proposed methods.

Murayama, Akihiro; Yamakita, Masaki

407

Introduction to plunger lift: applications, advantages and limitations  

SciTech Connect

This study discusses the principle of plunger lift and its possible applications. Typical applications are (1) removal of liquids from gas wells, (2) hi-ratio oil well production, (3) paraffin and hydrate control, and (4) increased efficiency of intermittent gas lift wells. Some advantages of this system are low initial cost, very little maintenance, and that there is no external source of energy required in most cases. Limitations such as mechanical conditions, gas and liquid volumes and depths also are discussed. There is a brief section concerning the various types of equipment available.

Beauregard, E.; Ferguson, P.L.

1981-01-01

408

Study of canal sediments contaminated with heavy metals: fungal versus bacterial bioleaching techniques  

Microsoft Academic Search

Filamentous fungi and lithotrophic bacteria were used to leach heavy metals from dredged sediments in semi?pilot scale air?lift bioreactors. A preliminary physico?chemical characterization of the sediments comprising a sequential extraction study revealed their high metallic contamination and a predominant association of the metals with sulphides and organic matter. The mobility of heavy metals from sediments was ranked by decreasing order

Nada Sabra; Tayssir Hamieh

2011-01-01

409

Occupational Orientation: Industrial Oriented Occupations. Experimental Curriculum Materials.  

ERIC Educational Resources Information Center

These experimental curriculum materials, for one of five clusters developed for the occupational orientation program in Illinois, contain teacher references and a series of learning activity packages (LAPs) designed to acquaint the student with the wide range of occupational choices available in the industrial oriented occupations field. The 30…

Illinois State Office of Education, Springfield.

410

49 CFR 213.235 - Inspection of switches, track crossings, and lift rail assemblies or other transition devices on...  

Code of Federal Regulations, 2012 CFR

...of switches, track crossings, and lift rail assemblies or other transition devices...of switches, track crossings, and lift rail assemblies or other transition devices...track crossing, and moveable bridge lift rail assembly or other transition device...

2012-10-01

411

49 CFR 213.235 - Inspection of switches, track crossings, and lift rail assemblies or other transition devices on...  

Code of Federal Regulations, 2011 CFR

...of switches, track crossings, and lift rail assemblies or other transition devices...of switches, track crossings, and lift rail assemblies or other transition devices...track crossing, and moveable bridge lift rail assembly or other transition device...

2011-10-01

412

76 FR 61750 - Vehicle-Mounted Elevating and Rotating Work Platforms (Aerial Lifts); Extension of the Office of...  

Federal Register 2010, 2011, 2012, 2013

...Vehicle-Mounted Elevating and Rotating Work Platforms (Aerial Lifts); Extension...Vehicle-Mounted Elevating and Rotating Work Platforms (Aerial Lifts) (29 CFR 1910...Vehicle-Mounted Elevating and Rotating Work Platforms (Aerial Lifts) (29 CFR...

2011-10-05

413

Identifying Occupationally Specific Affective Behaviors.  

ERIC Educational Resources Information Center

Data from two groups of cosmetology instructors (n=15) and two groups of machinist instructors (n=17) validated the Occupational Affective Behavior Analysis instrument as capable of identifying affective behaviors viewed as important to success in a given occupation. (SK)

Pucel, David J.

1993-01-01

414

Occupational Roles in Children's Literature  

ERIC Educational Resources Information Center

Compares children's literature of the 1930s and that of recent times in terms of occupational roles and sex typing. Little change was found in number or type of women's occupations despite the recent political, social and economic changes. (MS)

Hillman, Judith Stevinson

1976-01-01

415

Occupational health and radiation hazards  

Microsoft Academic Search

The authors discuss occupational health hazards for personnel due to laser, infrared, ultraviolet, and microwave radiations. Dose-response relationships and medical surveillance of occupational diseases are also discussed.

Michaelson

1979-01-01

416

Occupational Cancer Surveillance: New Approaches.  

National Technical Information Service (NTIS)

The Occupational Cancer Incidence Surveillance Study, a case/referent study on occupational risk factors for cancer, was conducted in the tricountry Detroit metropolitan area in Michigan. Subjects include black and white men and women. Telephone interview...

G. M. Swanson

1995-01-01

417

Occupant Behavior in Building Fires.  

National Technical Information Service (NTIS)

The increasing prominence of high rise buildings having many occupants intensifies the need for better information about the behavior of occupants during fire emergencies. Fire researchers have indicated that it is often not feasible to evacuate buildings...

A. I. Rubin A. Cohen

1974-01-01

418

Technical and Occupational Shops.  

ERIC Educational Resources Information Center

This booklet presents suggested plans and specifications for and discusses facilities common to technical and occupational shops. Drawings, room plans, and text illustrate specifications for drafting rooms, a welding shop, an automechanics shop, an auto body shop, and a high school greenhouse. Also included are facility designs for agricultural…

Ontario Dept. of Education, Toronto. School Planning and Building Research Section.

419

Occupational Hazards of Farriers  

Microsoft Academic Search

A farrier is a specialist in the shoeing of horses. It has been estimated that in the United States over 8 million horses are ridden for show and pleasure. These horses need hoof and leg care. The farrier does give this care and in so doing is subject to occupational hazards. These hazards cover a wide range and include bites

ALBERT C. HOLLER

1984-01-01

420

Diversified Occupations I.  

ERIC Educational Resources Information Center

|This curriculum guide consists of materials for use in presenting the first year of a two-year course in diversified occupations that is designed to teach job search and job-holding skills to disadvantaged and English as a second language (ESL) students. Addressed in the 25 units included in the guide are the following topics: the purposes of…

Noto, Jody

421

Occupational Therapy and Neuropsychiatry  

Microsoft Academic Search

It is suggested that increasing evidence of neurophysiological etiologies for mental illness must be taken into account in rationalizing the effectiveness of occupational therapy for psychiatric disorders. The role of activity in metabolizing stress hormones is describes as a possible mechanism of therapeutic effectiveness. The sensory integrative effects of certain activities are also postulated to contribute to improvement in selected

Lorna Jean King

1983-01-01

422

Sleepiness of Occupational Drivers  

Microsoft Academic Search

Drowsiness and sleeping at the wheel are now identified as the reasons behind fatal crashes and highway accidents caused by occupational drivers. For many years, fatigue has been associated to risk of accidents but the causes of this symptom were unclear. Extensive or nocturnal driving was associated to accidents but few reports differentiated fatigue from sleepiness. In the early nineties,

Pierre PHILIP

2005-01-01

423

Cluster Guide. Accounting Occupations.  

ERIC Educational Resources Information Center

|Based on a recent task inventory of key occupations in the accounting cluster taken in the Portland, Oregon, area, this curriculum guide is intended to assist administrators and teachers in the design and implementation of high school accounting cluster programs. The guide is divided into four major sections: program organization and…

Beaverton School District 48, OR.

424

Occupational fatalities in Israel.  

PubMed

Occupational fatal injuries are a worldwide problem. Certain occupations pose a greater risk than others. The purpose of this study was to estimate the death rates from occupational injuries in Israel over a period of 30 months, and to examine the trends in the light of the large numbers of foreign workers who have been brought into the country in the last decade. Two-thirds of the occupational fatalities were in the construction business, mostly owing to falls from a height resulting in death from multiple trauma. About one-third of these victims were foreign workers, even though they comprise only 20% of the work force in this field. Negligible amounts of alcohol were detected in a number of cases. The construction industry is recognized worlwide as a high-risk area claiming many lives each year. The findings in this study suggest that too little attention is given to safety regulations in general, and particularly concerning foreign workers in Israel. PMID:15335480

Yanai, O; Goldin, L; Kugel, C; Hiss, J

1999-09-01

425

Cluster Guide. Accounting Occupations.  

ERIC Educational Resources Information Center

Based on a recent task inventory of key occupations in the accounting cluster taken in the Portland, Oregon, area, this curriculum guide is intended to assist administrators and teachers in the design and implementation of high school accounting cluster programs. The guide is divided into four major sections: program organization and…

Beaverton School District 48, OR.

426

Managing occupational therapy burnout.  

PubMed

Burnout has been conceptualized as an ineffective coping response to stress experienced on the job. This article will explore the construct of burnout as reported in the literature of the helping professions. An emphasis will be placed on prevention and remediation strategies, particularly those aimed at organizational causes of burnout for occupational therapists. PMID:23944860

Brollier, C; Cyranowski, J; Bender, D; Velletri, C

1986-01-01

427

Occupational lead exposure  

Microsoft Academic Search

Quantitative measures of saccadic eye movements were examined in 52 lead exposed autobody shop workers and 52 age matched controls with no history of occupational lead exposure. Three characteristics of saccadic eye movements were studied: 1) saccade accuracy; 2) number of overshoots; and 3) maximum velocity. The results indicated that workers exposed to inorganic lead showed a decrease in saccade

Linda Glickman; José A. Valciukas; Ruth Lilis; Irving Weisman

1984-01-01

428

Occupational Orientation in Virginia  

ERIC Educational Resources Information Center

|Describes the development, implementation, and field testing of Virginia's three-year Clusters Approach to Career Orientation (CACO) Project designed to generate an activity-based, across-the-board curriculum for pre-exploratory students relating to appropriateness in occupational choice. (TA)|

Ressler, Ralph

1978-01-01

429

Miscellaneous Occupational Lung Diseases  

Microsoft Academic Search

A case is presented of a rare occupational lung disease for which the workplace etiology may have been overlooked. The authors review 4 such diseases, which are important to recognize not only because cessation of exposure can lead to clinical improvement, but also because other cases of these conditions may be identified in the workplace.

M. Sarper Erdogan; Christopher J. Martin

2008-01-01

430

Predicting occupational lung diseases  

Microsoft Academic Search

This thesis aims at demonstrating the development, validation, and application of prediction models for occupational lung diseases. Prediction models are developed to estimate an individual’s probability of the presence or future likelihood of occurrence of an outcome (i.e. disease of interest or its related condition). These models are used to assist clinical decision making for individuals, or to stratify individuals

E. Suarthana

2008-01-01

431

Occupational Clothing Curriculum.  

ERIC Educational Resources Information Center

|Designed to provide individualized, hands-on experience for secondary or postsecondary students in gainful homemaking programs, this occupational clothing curriculum contains eight learning modules. The following topics are covered in the modules: plant production for the needle trades (needle trade structure and operation, terminology, history,…

Fraser, Annette J.

432

Occupational skin disease.  

PubMed

Contact dermatitis, the most common occupational skin disease, is characterized by clearly demarcated areas of rash at sites of exposure. The rash improves on removal of the offending agent. In allergic contact dermatitis, even minute exposures to antigenic substances can lead to a skin rash. Common sensitizing agents include nickel and members of the Rhus genus (e.g., poison ivy, poison oak). Severe skin irritants tend to cause immediate red blisters or burns, whereas weaker irritants produce eczematous skin changes over time. An occupational cause should be suspected when rash occurs in areas that are in contact with oil, grease, or other substances. Direct skin testing (patch or scratch) or radioallergosorbent testing may help to identify a specific trigger. Skin cancer can have an occupational link in workers with prolonged exposure to sunlight and certain chemicals, although it can take decades for lesions to develop. In workers with occupational skin disease, workplace changes and protective measures are important to prevent future exposure. PMID:12358214

Peate, W E

2002-09-15

433

Evaluating Occupational Programs.  

ERIC Educational Resources Information Center

|Stresses the importance of evaluating occupational programs on a regular basis. Offers a brief explanation of the approaches to program evaluation taken at the Dallas County Community College District (TX), South Puget Sound Community College (WA), and Triton College (IL). Offers a list of references on program evaluation. (CBC)|

Long, James P.

1987-01-01

434

Occupational cancer in Britain  

PubMed Central

To estimate the current occupational cancer burden due to past exposures in Britain, estimates of the number of exposed workers at different levels are required, as well as risk estimates of cancer due to the exposures. This paper describes the methods and results for estimating the historical exposures. All occupational carcinogens or exposure circumstances classified by the International Agency for Research on Cancer as definite or probable human carcinogens and potentially to be found in British workplaces over the past 20–40 years were included in this study. Estimates of the number of people exposed by industrial sector were based predominantly on two sources of data, the CARcinogen EXposure (CAREX) database and the UK Labour Force Survey. Where possible, multiple and overlapping exposures were taken into account. Dose–response risk estimates were generally not available in the epidemiological literature for the cancer–exposure pairs in this study, and none of the sources available for obtaining the numbers exposed provided data by different levels of exposure. Industrial sectors were therefore assigned using expert judgement to ‘higher'- and ‘lower'-exposure groups based on the similarity of exposure to the population in the key epidemiological studies from which risk estimates had been selected. Estimates of historical exposure prevalence were obtained for 41 carcinogens or occupational circumstances. These include exposures to chemicals and metals, combustion products, other mixtures or groups of chemicals, mineral and biological dusts, physical agents and work patterns, as well as occupations and industries that have been associated with increased risk of cancer, but for which the causative agents are unknown. There were more than half a million workers exposed to each of six carcinogens (radon, solar radiation, crystalline silica, mineral oils, non-arsenical insecticides and 2,3,7,8-tetrachlorodibenzo-p-dioxin); other agents to which a large number of workers are exposed included benzene, diesel engine exhaust and environmental tobacco smoke. The study has highlighted several industrial sectors with large proportions of workers potentially exposed to multiple carcinogens. The relevant available data have been used to generate estimates of the prevalence of past exposure to occupational carcinogens to enable the occupational cancer burden in Britain to be estimated. These data are considered adequate for the present purpose, but new data on the prevalence and intensity of current occupational exposure to carcinogens should be collected to ensure that future policy decisions be based on reliable evidence.

Van Tongeren, Martie; Jimenez, Araceli S; Hutchings, Sally J; MacCalman, Laura; Rushton, Lesley; Cherrie, John W

2012-01-01

435

Evaluation of ceiling lifts: transfer time, patient comfort and staff perceptions.  

PubMed

Mechanical lifting devices have been developed to reduce healthcare worker injuries related to patient handling. The purpose of this study was to evaluate ceiling lifts in comparison to floor lifts based on transfer time, patient comfort and staff perceptions in three long-term care facilities with varying ceiling lift coverage. The time required to transfer or reposition patients along with patient comfort levels were recorded for 119 transfers. Transfers performed with ceiling lifts required on average less time (bed to chair transfers: 156.9 seconds for ceiling lift, 273.6 seconds for floor lift) and were found to be more comfortable for patients. In the three facilities, 143 healthcare workers were surveyed on their perceptions of patient handling tasks and equipment. For both transferring and repositioning tasks, staff preferred to use ceiling lifts and also found them to be less physically demanding. Further investigation is needed on repositioning tasks to ensure safe practice. PMID:19486965

Alamgir, Hasanat; Li, Olivia Wei; Yu, Shicheng; Gorman, Erin; Fast, Catherine; Kidd, Catherine

2009-05-31

436

An unconventional mechanism of lift production during the downstroke in a hovering bird ( Zosterops japonicus)  

NASA Astrophysics Data System (ADS)

An unconventional mechanism of ventral clap is exploited by hovering passerines to produce lift. Quantitative visualization of the wake flow, analysis of kinematics and evaluation of the transient lift force was conducted to dissect the biomechanical role of the ventral clap in the asymmetrical hovering flight of passerines. The ventral clap can first abate and then augment lift production during the downstroke; the net effect of the ventral clap on lift production is, however, positive because the extent of lift augmentation is greater than the extent of lift abatement. Moreover, the ventral clap is inferred to compensate for the zero lift production of the upstroke because the clapping wings induce a substantial elevation of the lift force at the end of the downstroke. Overall, our observations shed light on the aerodynamic function of the ventral clap and offer biomechanical insight into how a bird hovers without kinematically mimicking hovering hummingbirds.

Chang, Yu-Hung; Ting, Shang-Chieh; Liu, Chieh-Cheng; Yang, Jing-Tang; Soong, Chyi-Yeou

2011-11-01

437

Development of Advanced High Lift Leading Edge Technology for Laminar Flow Wings.  

National Technical Information Service (NTIS)

This paper describes the Advanced High Lift Leading Edge (AHLLE) task performed by Northrop Grumman Systems Corporation, Aerospace Systems (NGAS) for the NASA Subsonic Fixed Wing project in an effort to develop enabling high-lift technology for laminar fl...

A. Korntheuer J. C. Lin M. M. Bright S. Komadina

2013-01-01

438

Scientific Support Documentation for the Revised 1991 NIOSH Lifting Equation: Technical Contract Reports.  

National Technical Information Service (NTIS)

The report was a collection of individual documents which provided evidence to be used in the establishment of safe lifting techniques. The specific areas covered by these individual reports included the physiological basis for manual lifting guidelines; ...

A. Garg J. W. Yates M. M. Ayoub S. H. Rodgers

1991-01-01

439

3/4 VIEW OF STARBOARD SIDE AND BOW AFTER LIFTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3/4 VIEW OF STARBOARD SIDE AND BOW AFTER LIFTING FROM WATER. RAILS AND CARRIAGE ON LIFT PLATFORM CAN BE SEEN UNDER SHIP. - U.S. Coast Guard Cutter TANEY, Pier 5, Pratt Street, Baltimore, Independent City, MD

440

42 CFR 493.1810 - Imposition and lifting of alternative sanctions.  

Code of Federal Regulations, 2012 CFR

...Imposition and lifting of alternative sanctions. 493.1810 Section 493.1810...Imposition and lifting of alternative sanctions. (a) Notice of noncompliance and of proposed sanction: Content. If CMS or its...

2012-10-01

441

Occupational Stresses and Job Satisfaction  

Microsoft Academic Search

In a test of the hypothesis that some occupational stresses are desirable and some are not, the relationship between 14 sources of occupational stress and 12 aspects of job satisfaction was studied in 228 males, employed full-time and members of one of three professional associations: professional engineers, industrial accountants, or chartered accountants. The occupational stress index was significantly related to

Ronald J. Burke

1976-01-01

442

Masonry. Occupational Competency Analysis Profile.  

ERIC Educational Resources Information Center

|This Occupational Competency Analysis Profile (OCAP) for masonry occupations contains a competency list verified by expert workers and developed through a modified DACUM (Developing a Curriculum) involving business, industry, labor, and community agency representatives from Ohio. This OCAP identifies the occupational, academic, and employability…

Ohio State Univ., Columbus. Vocational Instructional Materials Lab.

443

Occupational hazards in plastic surgery  

Microsoft Academic Search

The occurrence of occupational disorders among plastic surgeons has not had much attention in the literature thus far. A case of a plastic surgeon with distal interphalangeal arthrosis, considered to represent an occupational disorder, is presented. In a review of the literature, possible occupational hazards in plastic surgery are discussed.

J. J. Hage; H. M. Suliman; J. Verhagen; F. G. Bouman

1995-01-01

444

View northeast, wharfs A and B, showing steel lift tower, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast, wharfs A and B, showing steel lift tower, pier C, and wharf B slope to water - U.S. Coast Guard Sandy Hook Station, Western Docking Structure, West of intersection of Canfield Road & Hartshorne Drive, Highlands, Monmouth County, NJ

445

The Exergy of Lift and Aircraft Exergy Flow Diagrams  

Microsoft Academic Search

Aside from incidental, auxiliary loads, in level flight the principal load on the aircraft propulsion engine is the power required to provide the continuous lift. To construct an exergy flow diagram for an aircraft - for example, for the purpose of pinpointing inefficiencies and for costing - an expression is needed for the exergy delivered to and by the wings.

David M. Paulus; Richard A. Gaggioli

2003-01-01

446

Detail of counterweight wire rope attachment to lift span at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of counterweight wire rope attachment to lift span at southwest corner. The plates with three pins serve to equalize the forces on the counterweight ropes. - Potomac Edison Company, Chesapeake & Ohio Canal Bridge, Spanning C & O Canal South of U.S. 11, Williamsport, Washington County, MD

447

Hydro-resistive measurement of dynamic lifting strength.  

PubMed

A device is described for measuring strength and power outputs of dynamic vertical lifts between heights of 0.4 and 2.2 m. The device is safe, robust, and easily transportable. It consists of a water-filled tube 2 m high and 200 mm internal diameter. The subject pulls vertically on a handle which is connected with flexible wire rope via a series of pulleys to a piston suspended inside the tube. The piston has holes which can be closed with bungs. The drag force is proportional to the square of the velocity. The constant of proportionality can be chosen over a more than 100-fold range and is independent of temperature. Manual force is measured using a strain gauged cantilever over which the rope passes. Rope movement is monitored with a shaft encoder. These devices are sampled synchronously by an interfaced computer. Velocity and power are derived from the measurements of displacement, time and force. The device is highly accurate. Power measurements are not significantly different on two separate days although repetitions on one day show a warming-up effect. This device allows the study of dynamic lifts ranging from slow, high force, quasi-isokinetic lifts to lifts where high velocities and accelerations occur. PMID:9075010

Pinder, A D; Grieve, D W

1997-04-01

448

Lifting Titan's Veil: Exploring the Giant Moon of Saturn  

Microsoft Academic Search

Lifting Titan's Veil is a revealing account of the second largest moon in our solar system. This world in orbit around Saturn is the only body in the solar system with an atmosphere strikingly similar to Earth's. Titan is like a giant frozen laboratory that may help scientists understand the first chemical steps towards the origin of life. Beginning with

Ralph Lorenz; Jacqueline Mitton

2002-01-01

449

Numerical Lifting-Surface Theory - Problems and Progress.  

National Technical Information Service (NTIS)

A report on the status of numerical lifting-surface theory for planar or nonplanar configurations with primary emphasis on the nonsteady problem is given. Only the linearized thin-wing problem is considered in detail, the effects of thickness usually is u...

M. T. Landahl V. J. E. Stark

1968-01-01

450

11. DETAIL EXTERIOR VIEW OF EQUIPMENT AND FISH LIFTS BETWEEN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. DETAIL EXTERIOR VIEW OF EQUIPMENT AND FISH LIFTS BETWEEN POWERHOUSE #1 AND NAVIGATION LOCK #1; VIEW IS TAKEN FROM ROOF OF POWERHOUSE #1. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

451

33 CFR 118.85 - Lights on vertical lift bridges.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Lights on vertical lift bridges. 118.85 Section 118.85 Navigation and Navigable...Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES BRIDGE LIGHTING AND OTHER SIGNALS § 118.85 Lights...

2013-07-01

452

Thin-lift recycling of asphalt pavement. SAE Paper 760662  

Microsoft Academic Search

Five basic steps of efficient and economical continuous thin-lift asphalt pavement recycling are listed and the design features of the Cutler Repaver are described. The huge, mobile, self-propelled asphalt paving plant utilizes the five steps with integrated components as follows: softening the old road surface with radiant heat produced by ceramic emitters; loosening a thin layer of old material with

Winderlin

1976-01-01

453

Mass flow and heat transfer characteristics of lift tube technology  

Microsoft Academic Search

An innovative vertical transport tube system has been developed to enhance heat transfer between fluidized beds and axial solids circulation within a fluidized bed reactor. Vertical lift tubes pick up particles from the bottom of the reactor, carry them through a fluidized bed burner before discharging them above the reactor bed surface. A full-scale experimental setup was designed to test

Michael Jacobson; Cedric Briens; Franco Berruti

2008-01-01

454

Hydraulic bedscale lift for retracting and holding large lesions.  

PubMed

Extremely large bulky lesions are not often encountered in modern surgical practice. The use of a hydraulic bedscale lift to elevate and position these large lesions, so that the base can be approached, makes it much easier to obtain and maintain exposure. PMID:2734644

Morris, D M; Gladney, J D

1989-06-01

455

Auxiliary lift propulsion system with oversized front fan  

SciTech Connect

A propulsion system for use primarily in V/STOL aircraft is provided with a variable cycle, double bypass gas turbofan engine and a remote augmenter to produce auxiliary lift. The fan is oversized in air-pumping capability with respect to the cruise flight requirements of the remainder of the engine and a variable area, low pressure turbine is capable of supplying varying amounts of rotational energy to the oversized fan, thereby modulating its speed and pumping capability. During powered lift flight, the variable cycle engine is operated in the single bypass mode with the oversized fan at its maximum pumping capability. In this mode, substantially all of the bypass flow is routed as an auxiliary airstream to the remote augmenter where it is mixed with fuel, burned and exhausted through a vectorable nozzle to produce thrust for lifting. Additional lift is generated by the high energy products of combustion of the variable cycle engine which are further energized in an afterburner and exhausted through a thrust vectorable nozzle at the rear of the engine.

Castells, O.T.; Johnson, J.E.; Rundell, D.J.

1980-09-16

456

LIFTPACK: a software package for wavelet transforms using lifting  

NASA Astrophysics Data System (ADS)

We present LIFTPACK: a software package written in C for fast calculation of 2D biorthogonal wavelet transforms using the lifting scheme. The lifting scheme is a new approach for the construction of biorthogonal wavelets entirely in the spatial domain, i.e., independent of the Fourier transform. Constructing wavelets using lifting consists of three simple phases: the first step or lazy wavelets splits the data into two subsets, even and odd, the second step calculates the wavelet coefficients as the failure to predict the odd set based on the even, and finally the third step updates the even set using the wavelet coefficients to compute the scaling function coefficients. The predict phase ensures polynomial cancelation in the high pass and the update phase ensures preservation of moments in the low pass. By varying the order, an entire family of transforms can be built. The lifting scheme ensures fast calculation of the forward and inverse wavelet transforms that only involve FIR filters. The transform works for images of arbitrary size with correct treatment of the boundaries. Also, all computations can be done in-place.

Fernandez, Gabriel; Periaswamy, Senthil; Sweldens, Wim

1996-10-01

457

A Classification of Lifts in Dance: Terminology and Biomechanical Principles  

ERIC Educational Resources Information Center

Despite the importance of lifts in Western theatrical dance, few reports have been published on the subject and few techniques established as good practice. Dancers usually learn partnering by trial and error, an approach that elicits both spectacular and inefficient results. To establish safer partnering practices, more efficient use of rehearsal…

Lafortune, Sylvain

2008-01-01

458

Hydraulic lift in a neotropical savanna: experimental manipulation ...  

Treesearch

... assess the magnitude of hydraulic lift in Brazilian savannas (Cerrado) and to test the ... along shallow topographic gradients, from open savannas with relatively few trees ... The diel recovery of soil water storage was higher in sites with more ... Keywords: Cerrado, leaf area index, non saturated flow, soil water model, soil ...

459

Higher Lift Lower Cost Absorption Cycles. Phase 1 Final Report,  

National Technical Information Service (NTIS)

The purpose of the research was to determine if modified NaOH solutions could be used in absorption heat pumps (AHP) to provide higher heat pumping lifts from low ambient temperatures than are now possible. The research consisted of performing screening e...

D. C. Erickson W. F. Davidson

1985-01-01

460

High-Lift Systems on Commercial Subsonic Airliners.  

National Technical Information Service (NTIS)

The early breed of slow commercial airliners did not require high-lift systems because their wing loadings were low and their speed ratios between cruise and low speed (takeoff and landing) were about 2:1. However, even in those days the benefit of high-l...

P. K. C. Rudolph

1996-01-01

461

Running versus Weight Lifting in the Treatment of Depression.  

ERIC Educational Resources Information Center

Compared effectiveness of aerobic and nonaerobic exercise in treatment of clinical depression in women. Forty women with a depressive disorder were randomly assigned to eight-week running (aerobic), weight-lifting (nonaerobic), or wait-list control condition. Both exercise conditions significantly reduced depression; exercise conditions appeared…

Doyne, Elizabeth J.; And Others

1987-01-01

462

1. GENERAL VIEW OF THE BALTIMORE & OHIO RAILROAD'S LIFT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. GENERAL VIEW OF THE BALTIMORE & OHIO RAILROAD'S LIFT BRIDGE, COUNTERWEIGHTS, AND APPROACH SPANS FROM THE WEST, LOOKING EAST FROM THE WEST SIDE OF THE RIVER - Baltimore & Ohio Railroad, Chicago Terminal Railroad, South Branch of Chicago River Bridge, Spanning South Branch of Chicago River, Chicago, Cook County, IL

463

2. VIEW OF THE B & O RAILRAOD'S LIFT BRIDGE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF THE B & O RAILRAOD'S LIFT BRIDGE (NEAR) AND THE ADJACENT ST. CHARLES AIRLINE RAILROAD'S BASCULE BRIDGE (BEYOND); LOOKING SOUTHEAST - Baltimore & Ohio Railroad, Chicago Terminal Railroad, South Branch of Chicago River Bridge, Spanning South Branch of Chicago River, Chicago, Cook County, IL

464

Sternum lifting technique for thoracoscopic internal thoracic artery harvest  

Microsoft Academic Search

We employed the Laparolift and Laparofan (Origin Medsystems Inc., CA, USA) and developed a sternum lifting technique to create a sufficient intra-pleural space between the heart and the sternum in which the left internal thoracic artery (ITA) in situ graft could be thoracoscopically mobilized. Between June and December 2004, this technique was applied to 12 consecutive patients (eight men, four

Toshiya Ohtsuka; Mikio Ninomiya; Taisei Maemura

465

Sternum lifting technique for thoracoscopic internal thoracic artery harvest  

Microsoft Academic Search

We employed the Laparolift and Laparofan (Origin Medsystems Inc., CA, USA) and developed a sternum lifting technique to create a sufficient intra-pleural space between the heart and the sternum in which the left internal thoracic artery (ITA) in situ graft could be thoracoscopically mobilized. Between June and December 2004, this technique was applied to 12 consecutive patients (eight men, four

Toshiya Ohtsuka; Mikio Ninomiya; Taisei Maemura

2005-01-01

466

Active and Passive Lift Force Augmentation Techniques on Wind Turbines  

Microsoft Academic Search

The paper presents a short review of active and passive lift force augmentation concepts for wind turbines. The few models presented were analyzed using CFD to determine their potential in terms of improved performance of wind turbines. There will also be presented and computational aspects related to modeling active and passive control systems. Numerical simulations are based on RANS (Reynolds

F. Frunzulica; H. Dumitrescu; R. Mahu; O. Preotu

2011-01-01

467

Evaluation of hydraulic lift in cotton ( Gossypium hirsutum L.) germplasm  

Microsoft Academic Search

Hydraulic lift (HL) in plants is defined as the redistribution of water from wetter to drier soil through the plant roots in response to soil water potential gradients. Water is released from the roots into the dry soil when transpiration is low (night) and reabsorbed by the plant when higher transpiration rates are resumed (daylight). It was hypothesized that since

B. L. McMichael; Robert J. Lascano

2010-01-01

468

13. WEIGHING ROOM Fish were lifted up from tower by ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. WEIGHING ROOM Fish were lifted up from tower by conveyor, controlled by buttons above the two sets of vertical electrical conduits. They entered the weighing room through the shielded window on the left (shielding missing from the window on the right), were weighed and then transported to the holding tanks. - Hovden Cannery, 886 Cannery Row, Monterey, Monterey County, CA

469

Detecting low-voltage arc fault based on lifting multiwavelet  

Microsoft Academic Search

Arc fault is one of the prime reasons causing electrical fire accidents. It is difficult to detect the arc faults' features by traditional circuit protections. An algorithm using lifting multiwavelet transform for arc fault detecting was presented in this paper. First, experiments were conducted according to UL1699 standard and data were collected by LabView. The high frequency band information of

Weiyan Zheng; Weilin Wu

2009-01-01

470

Large xray room from crane ladder showing scissor lift for ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Large x-ray room from crane ladder showing scissor lift for x-ray equipment, view facing west-northwest - U.S. Naval Base, Pearl Harbor, Industrial X-Ray Building, Off Sixth Street, adjacent to and south of Facility No. 11, Pearl City, Honolulu County, HI

471

Research and Development of Lift-Jet Engine, 2.  

National Technical Information Service (NTIS)

The lift jet engine JR100V, scheduled to power a research plane during VTOL mode operations is reviewed. The JR100V was developed as a version of the JR100 series engines. It features higher thrust to weight ratio than that of the JR100F which was equippe...

1982-01-01

472

The Concentric Malar Lift: Malar and Lower Eyelid Rejuvenation  

Microsoft Academic Search

Midface rejuvenation surgery is most challenging. The margin of error for the lower lid is on the order of 0.5 mm, and the cosmetic result can sometimes look unnatural. A minimally invasive technique for malar and lower lid lift is proposed. Two incisions are used: the standard subciliary lower eyelid incision and one on the lateral part of the upper

Claude Le Louarn

2004-01-01

473

Observations on the leading edge in lifted flame stabilization  

Microsoft Academic Search

The objective of this paper is to report some of the first experimental evidence for the “leading edge” flame as the stabilization mechanism in lifted jet diffusion flames [1–5]. CH fluorescence has been used to indicate the flame front location (i.e., region of chemical reaction) and thereby characterize features of the stabilization region [5, 6]. The “leading edge” flame phenomenon

K. A. Watson; K. M. Lyons; J. M. Donbar; C. D. Carter

1999-01-01

474

Endoscopic facial rejuvenation: Endoforehead, the functional lift. Case reports  

Microsoft Academic Search

Endoscopic techniques have only very recently been applied to aesthetic plastic surgery procedures, especially in carpal tunnel release, in forehead plasties, and in breast augmentation operations. The author briefly outlines his experiences with endoscopic forehead lifts, first reported at surgical conferences in Los Angeles and Buenos Aires in 1992, and now totaling 61 cases performed in the 11 months just

Nicanor G. Isse

1994-01-01

475

Lifting factorization-based discrete wavelet transform architecture design  

Microsoft Academic Search

In this paper, two new system architectures, overlap- state sequential and split-and-merge parallel, are proposed based on an ovelboundary postprocessing technique for the computation of the discrete wavelet transform (DWT). The basic idea is to intro- duce multilevel partial computations for samples near data bound- aries based on a finite state machine model of the DWT derived from the lifting

Wenqing Jiang; Antonio Ortega

2001-01-01

476

The use of sprayed fibrin glue for face lifts  

Microsoft Academic Search

The use of a fibrin and thrombin tissue glue administered in aerosol form has been evaluated in 65 patients undergoing a face lift. In 55 cases the glue was applied to the undermined areas bilaterally, and appeared to decrease postoperative oedema and bruising. In a further 10 cases the adhesive was used on one side only. In 5 of these

D. Marchac; E. Pugash; D. Gault

1987-01-01

477

What`s new in artificial lift. Part 2  

Microsoft Academic Search

This is Part 2 of a two-part series discussing industry advances in beam pumping and progressive cavity pumping (PCP). This concluding article adds coverage of the important artificial lift technology of electrical submersible pumping (ESP). Twenty-one new techniques including downhole equipment, instrumentation and control, and software from 10 different companies or research organizations are presented for ESP. These include operation

J. F. Lea; H. W. Winkler

1995-01-01

478

Design Considerations for Artificial Lifting of Enhanced Geothermal System Fluids  

Microsoft Academic Search

This work evaluates the effect of production well pumping requirements on power generation. The amount of work that can be extracted from a geothermal fluid and the rate at which this work is converted to power increase as the reservoir temperature increases. Artificial lifting is an important issue in this process. The results presented are based on a configuration comprising

Xina Xie; K. K. Bloomfield; G. L. Mines; G. M. Shook

2005-01-01

479

Drag and lift forces on particles in a rotating flow  

Microsoft Academic Search

A freely rotating sphere in a solid-body rotating flow is experimentally investigated. When the sphere is buoyant, it reaches an equilibrium position from which drag and lift coefficients are determined over a wide range of particle Reynolds numbers (2 ? Re ? 1060). The wake behind the sphere is visualized and appears to deflect strongly when the sphere is close

J. J. Bluemink; D. Lohse; A. Prosperetti; L. VAN WIJNGAARDEN

2010-01-01

480

Aircraft maneuverability improvement by direct lift control system application  

Microsoft Academic Search

The handling qualities of an aircraft will be improved if the Direct Lift Control (DLC) system is applied. In this paper, an attempt has been made to evaluate the influence of DLC-type system parameters on the aircraft's maneuverability and to determine the desired values of these parameters for the purpose of obtaining required values of the handling maneuverability criteria. Published

Andrzej Tomczyk

2005-01-01

481

Linked-Spar Motion-Compensated Lifting System.  

National Technical Information Service (NTIS)

This invention relates generally to the handling of objects over the side of a ship at sea and, more particularly, to a deck handling system in which the motion of a surface support ship is isolated from a payload suspended in the ocean by a lifting cable...

J. V. Wilson W. D. Briggs

1979-01-01

482

Amphibious Lift Force Structure - Is 3.0 the Answer.  

National Technical Information Service (NTIS)

Since 1990, the Department of the Navy has stated a 3.0 Marine Expeditionary Brigade Assault Echelon warfighting requirement. The Navy and Marine Corps subsequently agreed to fiscally constrained 2.5 lift requirement and have been pursuing this long term ...

M. P. Taylor

2002-01-01

483

Valve timing and valve lift control mechanism for engines  

Microsoft Academic Search

A new type engine valve control system has been presented, in which both the valve lift and valve timing are controlled directly by electric motors. A mechanism of the valve timing control system is made of planetary gears. The outer gear is the timing pulley which has a timing belt driven by the crankshaft of an engine. Two planetary gears

Kosuke Nagaya; Hiroyuki Kobayashi; Kazuya Koike

2006-01-01

484

Noise characteristics of the Japan's experimental powered lift STOL aircraft  

Microsoft Academic Search

The extensive flight noise data available for the Quiet Short Take Off and Landing Experimental Aircraft (QSTOL), ASKA, are summarized. Flight test results, compared with prior subscale model\\/theoretical data, have been used to provide and refine the powered-lift aircraft noise prediction method, which was extended to generate noise exposure level (footprints) and predict noise abatement flight operation. It is argued

Masataka Maita; Katsumi Takeda; Masaki Saitoh; Ken Ohsumi

1990-01-01

485

Evaluation of a biomechanical simulation model for sagittal plane lifting  

Microsoft Academic Search

The kinetics and kinematics produced by a computerized dynamic biomechanical simulation model were examined and compared to those produced by actual human lifters. The purpose of the comparison was to demonstrate the accuracy of the simulation in predicting stresses imposed on the human body during the performance of a lifting task. The simulation model was shown to predict quite well

T. M Bernard; M. M Ayoub; C. J Lin

1999-01-01

486

A Classification of Lifts in Dance: Terminology and Biomechanical Principles  

Microsoft Academic Search

Despite the importance of lifts in Western theatrical dance, few reports have been published on the subject and few techniques established as good practice. Dancers usually learn partnering by trial and error, an approach that elicits both spectacular and inefficient results. To establish safer partnering practices, more efficient use of rehearsal time, and greater choreographic possibility, it is necessary to

Sylvain Lafortune

2008-01-01

487

Postural effects on biomechanical and psychophysical weight-lifting limits  

Microsoft Academic Search

Many believe that biomechanical models and data are not sufficiently refined and validated to be used as the basis for setting ‘safe’ population load lifting limits. Rather, they advocate that such limits should be based on what a sample of the population demonstrate to be ‘maximum acceptable weight limits’ (MAWL) resulting from psychophysical tests performed with different populations. Yet, biomechanical

D. B. CHAFFIN; G. B. PAGE

1994-01-01

488

Zone 4 Study: Shielded Lift Truck Refurbishment/Replacement  

SciTech Connect

The Zone 4 Stage Right Shielded Lift Trucks (SLT's) will likely need refurbishment or replacement within the next two to five years, due to wear. This document discusses the options to provide a long term and reliable means of satisfying Zone 4 material movement and inventory requirements.

AMAI, WENDY A.; JONES, JAMES F.; LENNOX, R. CHARLEENE; SIMON, RONALD W.; JONES, JAMES F

2002-09-01

489

A new silicon gas-flow sensor based on lift force  

Microsoft Academic Search

This paper presents the first silicon-flow sensor based on lift force. The sensor is a bulk-micromachined airfoil structure that uses the lift force as a sensing principle. The lift force acts normal to the flow in contrast to drag-force sensor types, where the force acts in the flow direction. The sensor utilizes the special distribution of the lift force along

Niklas Svedin; E. Kalvesten; E. Stemme; G. Stemme

1998-01-01

490

Personnel launch system (PLS) lifting body and low lift-to-drag (L/D)  

NASA Astrophysics Data System (ADS)

The Personnel Launch System (PLS) is a small transportation system designed to transport people, but no cargo, to and from low-earth orbit. The PLS is being considered as an addition to the manned launch capability of the United States for three main reasons: (1) to assure manned access to space, (2) to achieve a first-stage abort ability, and (3) to reduce operations costs. To those ends, two designs are being considered for the PLS that differ in their lift-to-drag (L/D) ratio. The Lyndon B. Johnson Space Center was assigned the task of examining low L/D capsules with no wings and a parachute landing capability. The Langley Research Center is studying a higher L/D PLS with wings and runway landings. Whichever design is selected, the PLS will act as a complement to the Space Shuttle fleet and will enhance the ability of our Nation to achieve reliable, safe, and cost-effective access to space flight, thus furthering the goals of the U.S. space program and increasing the safety of the human crews manning a future space station.

Erwin, Harry O.

1990-09-01

491

Propagation Modes and Temporal Variations Along a Lift Shaft in UHF Band  

Microsoft Academic Search

The guiding of electromagnetic waves along the lift shaft is studied and presented in this paper. Wideband channel sounding in UHF band along a lift shaft located in a complex environment has been conducted. Based on the measured delay in time of arrival, large structures that cause multipath clusters can be identified. The different propagation mechanisms associated with the lift

Xiao Hong Mao; Yee Hui Lee; Boon Chong Ng

2010-01-01

492

TEACH THEM TO LIFT. SAFETY IN INDUSTRY--MECHANICAL AND PHYSICAL HAZARDS SERIES.  

ERIC Educational Resources Information Center

|BASIC LIFTING TECHNIQUES TO HELP PREVENT INJURIES TO WORKERS ARE DESCRIBED AND ILLUSTRATED IN THIS BULLETIN. TEACHING TECHNIQUES ARE SUGGESTED. ONE SECTION INCLUDES A "DO-IT-YOURSELF" PROJECT CONTAINING PLANS AND INSTRUCTIONS ON HOW TO BUILD A "HOW TO LIFT MODEL" WHICH CAN BE USED AS AN ECONOMICAL VISUAL TRAINING AID. PRINCIPLES OF SAFE LIFTING

CESTRONE, PATRICK F.

493

Light field compression using disparity-compensated lifting and shape adaptation  

Microsoft Academic Search

We propose disparity-compensated lifting for wavelet compression of light fields. With this approach, we obtain the ben- efits of wavelet coding, such as scalability in all dimensions, as well as superior compression performance. Additionally, the proposed approach solves the irreversibility limitations of previous light field wavelet coding approaches, using the lifting structure. Our scheme incorporates disparity compensation into the lifting

Chuo-Ling Chang; Xiaoqing Zhu; Prashant Ramanathan; Bernd Girod

2006-01-01

494

Lifting technique and abdominal belt usage: a biomechanical, physiological and subjective investigation  

Microsoft Academic Search

Some 10 male subjects carried out a repetitive lifting task for 15 min under four conditions on separate days. Subjects used either a squat lifting or a stoop lifting technique with or without an abdominal belt on each day. Measurements of spinal shrinkage, heart rate, perceived exertion and regional body pain were made under each condition. Although there was a

D. Rabinowitz; R. S. Bridger; M. I. Lambert

1998-01-01

495

The Effect Of Hydraulic Lift In Quercus agrifolia On The Health Of Venegasia carpesioides  

Microsoft Academic Search

Hydraulic lift was studied in live and dead Quercus agrifolia (Coastal Live Oak) in order to test its impact on surrounding Venegasia carpesioides (Canyon Sunflower). Hydraulic lift causes soil moisture to rise around the base of deep-rooted plants where neighboring plants can utilize this excess water. We predicted that the hydraulic lift of the Coastal Live Oak would increase soil

Kelly Donovan; Brittany Wagner

2009-01-01

496

Stoop or squat: a review of biomechanical studies on lifting technique  

Microsoft Academic Search

Objective. To assess the biomechanical evidence in support of advocating the squat lifting technique as an administrative control to prevent low back pain.Background. Instruction with respect to lifting technique is commonly employed to prevent low back pain. The squat technique is the most widely advised lifting technique. Intervention studies failed to show health effects of this approach and consequently the

Jaap H. van Dieën; Marco J. M. Hoozemans; Huub M. Toussaint

1999-01-01

497

How to lift a box that is too large to fit between the knees.  

PubMed

Many studies compared lifting techniques such as stoop and squat lifting. Results thus far show that when lifting a wide load, high back loads result, irrespective of the lifting technique applied. This study compared four lifting techniques in 11 male subjects lifting wide loads. One of these techniques, denoted as the weight lifters' technique (WLT), is characterised by a wide foot placement, moderate knee flexion and a straight but not upright trunk. Net moments were calculated with a 3-D linked segment model and spinal forces with an electromyographic-driven trunk model. When lifting the wide box at handles that allow a high grip position, the WLT resulted in over 20% lower compression forces than the free, squat and stoop lifting technique, mainly due to a smaller horizontal distance between the l5S1 joint and the load. When lifting the wide box at the bottom, none of the lifting techniques was clearly superior to the others. STATEMENT OF RELEVANCE: Lifting low-lying and large objects results in high back loads and may therefore result in a high risk of developing low back pain. This study compares the utility of a WLT, in terms of back load and lumbar flexion, to more familiar techniques in these high-risk lifting tasks. PMID:20865606

Kingma, Idsart; Faber, Gert S; van Dieën, Jaap H

2010-10-01

498

Research on wireless detection policy of the friction lifting'sliding  

Microsoft Academic Search

The sliding between the wire rope and the liner is the most dangerous accident of friction lifting, it is necessary to do work to avoid sliding accident. We analysis the friction lifting dynamics behavior firstly, then build a creep model of friction lifting, based on which, a sliding phenomenon can be detected through collecting the difference of the velocities between

Chen Guangzhu; Zhu Zhencai; Lu Qian; Zhou Lijuan; Cao Guohua

2009-01-01

499

Local factorization of trajectory lifting morphisms for single-input affine control systems  

Microsoft Academic Search

Trajectory preserving and lifting maps have been implicitly used in many recursive or hierarchical control design techniques. Well known systems theoretic concepts such as differential flatness or more recent ones such as simulation and bisimulation can be also understood through the trajectory lifting maps they define. In this paper we initiate a study of trajectory preserving and lifting maps between

Paulo Tabuada

2006-01-01

500

Evaluation of the effectiveness of portable ceiling lifts in a new long-term care facility  

Microsoft Academic Search

Researchers and health and safety practitioners have advocated replacing manual patient handling techniques with ceiling lifts in long-term care. The majority of these studies have only evaluated the impact of fixed ceiling lifts on extended care residents where the ratio of ceiling lifts to resident beds is one to one. This pre–post intervention study assesses the effectiveness of portable ceiling

Aaron Miller; Chris Engst; Robert B. Tate; Annalee Yassi

2006-01-01