These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Heavy Lifting  

NSDL National Science Digital Library

In this activity, learners work in NASA teams to build balloon-powered rockets using identical parts and compete to launch the greatest number of paper clips to "space" (the ceiling). The rockets learners build model the Ares V heavy lift launchers that carry heavy payloads into orbit. This lesson plan includes background information, tips, discussion questions and answers, and a "Mission Report" sheet for learners.

Shearer, Deborah A.; Gregory L. Vogt, Ed D.

2012-06-26

2

Prosthetic Hand Lifts Heavy Loads  

NASA Technical Reports Server (NTRS)

Prosthetic hand designed to enable amputee to lift diverse heavy objects like rocks and logs. Has simple serrated end effector with no moving parts. Prosthesis held on forearm by system of flexible straps. Features include ruggedness, simplicity, and relatively low cost.

Carden, James R.; Norton, William; Belcher, Jewell G.; Vest, Thomas W.

1991-01-01

3

Heavy Lift & Propulsion Technology (HL&PT)  

NASA Video Gallery

Cris Guidi delivers a presentation from the Heavy Lift & Propulsion Technology (HL&PT) study team on May 25, 2010, at the NASA Exploration Enterprise Workshop held in Galveston, TX. The purpose of ...

4

Heavy Lift for Exploration: Options and Utilization  

NASA Technical Reports Server (NTRS)

Every study of exploration capabilities since the Apollo Program has recommended the renewal of a heavy lift launch capability for the United States. NASA is aggressively pursuing that capability. This paper will discuss several aspects of that effort and the potential uses for that heavy lift capability. The need for heavy lift was cited most recent in the findings of the Review of U.S. Human Space Flight Plans Committee. Combined with considerations of launch availability and on-orbit operations, the Committee finds that exploration will benefit from the availability of a heavy-lift vehicle, the report said. In addition, heavy lift would enable the launching of large scientific observatories and more capable deep-space missions. It may also provide benefit in national security applications. The most recent focus of NASA s heavy lift effort is the Ares V cargo launch vehicle, which is part of the Constellation Program architecture for human exploration beyond low Earth orbit (LEO). The most recent point-of-departure configuration of the Ares V was approved during the Lunar Capabilities concept Review (LCCR) in 2008. The Ares V first stage propulsion system consists of a core stage powered by six commercial liquid hydrogen/liquid oxygen (LH2/LOX) RS-68 engines, flanked by two 5.5-segment solid rocket boosters (SRBs) based on the 5-segment Ares I first stage. The boosters use the same Polybutadiene Acrylonitrile (PBAN) propellant as the Space Shuttle. Atop the core stage is the Earth departure stage (EDS), powered by a single J-2X upper stage engine based on the Ares I upper stage engine. The 33-foot-diameter payload shroud can enclose a lunar lander, scientific instruments, or other payloads. Since LCCR, NASA has continued to refine the design through several successive internal design cycles. In addition, NASA has worked to quantify the broad national consensus for heavy lift in ways that, to the extent possible, meet the needs of the user community.

Creech, Steve; Sumrall, Phil

2010-01-01

5

NASA Heavy Lift Rotorcraft Systems Investigation  

NASA Technical Reports Server (NTRS)

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 on the air transportation system. The keys to achieving a competitive aircraft were low drag airframe and low disk loading rotors; structural weight reduction, for both airframe and rotors; drive system weight reduction; improved engine efficiency; low maintenance design; and manufacturing cost comparable to fixed-wing aircraft. Risk reduction plans were developed to provide the strategic direction to support a heavy-lift rotorcraft development. The following high risk areas were identified for heavy lift rotorcraft: high torque, light weight drive system; high performance, structurally efficient rotor/wing system; low noise aircraft; and super-integrated vehicle management system.

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

2005-01-01

6

Heavy Lift Launch Capability with a New Hydrocarbon Engine  

NASA Technical Reports Server (NTRS)

The Advanced Concepts Office at NASA's George C. Marshall Space Flight Center was tasked to define the thrust requirement of a new liquid oxygen rich staged combustion cycle hydrocarbon engine that could be utilized in a launch vehicle to meet NASA s future heavy lift needs. Launch vehicle concepts were sized using this engine for different heavy lift payload classes. Engine out capabilities for one of the heavy lift configurations were also analyzed for increased reliability that may be desired for high value payloads or crewed missions. The applicability for this engine in vehicle concepts to meet military and commercial class payloads comparable to current ELV capability was also evaluated.

Threet, Grady E., Jr.; Holt, James B.; Philips, Alan D.; Garcia, Jessica A.

2011-01-01

7

Heavy Lift Launch Capability with a New Hydrocarbon Engine (NHE)  

NASA Technical Reports Server (NTRS)

The Advanced Concepts Office (ACO) at NASA Marshall Space Flight Center has analyzed over 2000 Ares V and other heavy lift concepts in the last 3 years. These concepts were analyzed for Lunar Exploration Missions, heavy lift capability to Low Earth Orbit (LEO) as well as exploratory missions to other near earth objects in our solar system. With the pending retirement of the Shuttle fleet, our nation will be without a civil heavy lift launch capability, so the future development of a new heavy lift capability is imperative for the exploration and large science missions our Agency has been tasked to deliver. The majority of the heavy lift concepts analyzed by ACO during the last 3 years have been based on liquid oxygen / liquid hydrogen (LOX/LH2) core stage and solids booster stage propulsion technologies (Ares V / Shuttle Derived and their variants). These concepts were driven by the decisions made from the results of the Exploration Systems Architecture Study (ESAS), which in turn, led to the Ares V launch vehicle that has been baselined in the Constellation Program. Now that the decision has been made at the Agency level to cancel Constellation, other propulsion options such as liquid hydrocarbon fuels are back in the exploration trade space. NASA is still planning exploration missions with the eventual destination of Mars and a new heavy lift launch vehicle is still required and will serve as the centerpiece of our nation s next exploration architecture s infrastructure. With an extensive launch vehicle database already developed on LOX/LH2 based heavy lift launch vehicles, ACO initiated a study to look at using a new high thrust (> 1.0 Mlb vacuum thrust) hydrocarbon engine as the primary main stage propulsion in such a launch vehicle.

Threet, Grady E., Jr.; Holt, James B.; Philips, Alan D.; Garcia, Jessica A.

2011-01-01

8

Designs and Technology Requirements for Civil Heavy Lift Rotorcraft  

NASA Technical Reports Server (NTRS)

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 on the air transportation system. The keys to achieving a competitive aircraft were low drag airframe and low disk loading rotors; structural weight reduction, for both airframe and rotors; drive system weight reduction; improved engine efficiency; low maintenance design; and manufacturing cost comparable to fixed-wing aircraft. Risk reduction plans were developed to provide the strategic direction to support a heavy-lift rotorcraft development. The following high risk areas were identified for heavy lift rotorcraft: high torque, light weight drive system; high performance, structurally efficient rotor/wing system; low noise aircraft; and super-integrated vehicle management system.

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

2006-01-01

9

An economic comparison of three heavy lift airborne systems  

NASA Technical Reports Server (NTRS)

Current state of art trends indicate that a 50-ton payload helicopter could be built by the end of the decade. However, alternative aircraft that employ LTA principles are shown to be more economically attractive, both in terms of investment and operating costs for the ultra-heavy lift role. Costing methodology follows rationale developed by airframe manufacturers, and includes learning curve factors.

Carson, B. H.

1975-01-01

10

Heavy Lifting at Work and Risk of Ischemic Heart Disease: Protocol for a Register-Based Prospective Cohort Study  

PubMed Central

Background There are theoretical grounds to suspect that heavy lifting at work is an important risk factor for ischemic heart disease (IHD). However the relationship has not been sufficiently acknowledged by empirical studies. Positive and statistically significant associations have been found in studies that utilize self-reported exposure data. Such studies are, however, prone to reporting bias. All else equal, people with a poor cardiovascular fitness/health may have a higher propensity to perceive their work environment as heavy. Objective The study described in the present protocol aims to investigate the relationship between heavy lifting at work and IHD by use of material and methods that are free from reporting bias. Methods This is a register-based prospective cohort study. Male blue-collar workers in Denmark will be identified and followed through national registers, from 2001-2010, for hospital treatment or death due to IHD. Relative rates of IHD between “workers in occupations likely to involve heavy lifting” and “other blue-collar workers” will be estimated through Poisson regression. Results Results are expected to be ready in mid-2015. Conclusions Since this is not a randomized study, it cannot confirm etiological hypotheses. It may, however, confirm that employment in occupations that involve heavy lifting is a predictor for IHD and thereby lend support to the hypothesis of a causal relationship. PMID:25164612

2014-01-01

11

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

12

RFID Enabled Remote Structural Health Monitoring for Heavy Lifting Appliances  

Microsoft Academic Search

\\u000a To realize remote structural health monitoring for heavy lifting appliances, e.g., 500t gantry cranes, technologies of RFID\\u000a wireless sensor network, LabVIEW virtual instrument and health diagnosis expert system are empoyed to establish an integrated\\u000a system. The system is divided into three layers in logic structures: the data acquisition layer, the network communication\\u000a layer and the system service layer. In the

Xubing Chen; Fan Zhou

2010-01-01

13

Current developments lighter than air systems. [heavy lift airships  

NASA Technical Reports Server (NTRS)

Lighter than air aircraft (LTA) developments and research in the United States and other countries are reviewed. The emphasis in the U.S. is on VTOL airships capable of heavy lift, and on long endurance types for coastal maritime patrol. Design concepts include hybrids which combine heavier than air and LTA components and characteristics. Research programs are concentrated on aerodynamics, flight dynamics, and control of hybrid types.

Mayer, N. J.

1981-01-01

14

Heavy-Lift for a New Paradigm in Space Operations  

NASA Technical Reports Server (NTRS)

NASA is developing an unprecedented heavy-lift capability to enable human exploration beyond low Earth orbit (LEO). This capability could also significantly enhance numerous other missions of scientific, national security, and commercial importance. That capability is currently configured as the Ares V cargo launch vehicle. This capability will eclipse the capability the United States lost with the retirement of the Saturn V. It is capable of launching roughly 53 percent more payload mass to trans lunar injection (TLI) and 30 percent more payload mass to LEO than its Apollo Program predecessor. Ares V is a major element of NASA's Constellation Program, which also includes the Ares I crew launch vehicle (CLV), Orion crew exploration vehicle (CEV), and a lunar lander for crew and cargo. As currently configured, Ares V will be capable of launching 413,800 pounds (187.7 mT) to LEO, 138,500 pounds (63 mT) direct to the Moon or 156,700 pounds (71.1 mT) in its dual-launch architecture role with Ares I. Its 33-foot (10 m) shroud provides unprecedented payload volume. Assessment of astronomy and planetary science payload requirements since spring 2008 has indicated that a Saturn V-class heavy-lift vehicle has the potential to support a range of payloads and missions. This vehicle configuration enables some missions previously considered difficult or impossible and enhances many others. Collaborative design/architecture inputs, exchanges, and analyses have already begun between scientists and payload developers. This early dialogue between NASA engineers and payload designers allows both communities to shape their designs and operational concepts to be mutually supportive to the extent possible with the least financial impact. This paper provides an overview of the capabilities of a heavy-lift vehicle to launch payloads with increased mass and/or volume and reduce technical and cost risk in both design and operations.

Morris, Bruce; Burkey, Martin

2010-01-01

15

Heavy Lift Vehicle (HLV) Avionics Flight Computing Architecture Study  

NASA Technical Reports Server (NTRS)

A NASA multi-Center study team was assembled from LaRC, MSFC, KSC, JSC and WFF to examine potential flight computing architectures for a Heavy Lift Vehicle (HLV) to better understand avionics drivers. The study examined Design Reference Missions (DRMs) and vehicle requirements that could impact the vehicles avionics. The study considered multiple self-checking and voting architectural variants and examined reliability, fault-tolerance, mass, power, and redundancy management impacts. Furthermore, a goal of the study was to develop the skills and tools needed to rapidly assess additional architectures should requirements or assumptions change.

Hodson, Robert F.; Chen, Yuan; Morgan, Dwayne R.; Butler, A. Marc; Sdhuh, Joseph M.; Petelle, Jennifer K.; Gwaltney, David A.; Coe, Lisa D.; Koelbl, Terry G.; Nguyen, Hai D.

2011-01-01

16

Ares V: Progress Toward a Heavy Lift Capability for the Heavy Lift Capability for the Moon and Beyond  

NASA Technical Reports Server (NTRS)

The NASA Ares Projects are developing the launch vehicles to move the United States and humanity beyond low earth orbit. Ares 1 is a crewed vehicle, and Ares V is a heavy-lift vehicle being designed to send crews and cargo to the Moon. The Ares V design is evolving and maturing toward an authority-to-proceed milestone in 2011. The Ares V vehicle will be considered a national asset, opening new worlds and creating unmatched opportunities for human exploration, science, national security, and space business.

Sumrall, Phil

2008-01-01

17

Heavy Lift Launch Vehicles for 1995 and Beyond  

NASA Technical Reports Server (NTRS)

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 and propulsion systems, rapid launch turnaround time, minimum hardware inventory, stage and component flexibility and commonality, and low operational costs. All ascent propulsion systems utilize liquid propellants, and overall launch vehicle stack height is minimized while maintaining a reasonable vehicle diameter. The ascent propulsion systems are based on the development of a new liquid oxygen/hydrocarbon booster engine and liquid oxygen/liquid hydrogen upper stage engine derived from today's SSME technology. Wherever possible, propulsion and avionics systems are contained in reusable propulsion/avionics modules that are recovered after each launch.

Toelle, R. (compiler)

1985-01-01

18

Study of Civil Markets for Heavy-Lift Airships  

NASA Technical Reports Server (NTRS)

The civil markets for heavy lift airships (HLAs) were defined by first identifying areas of most likely application. The operational suitability of HLAs for the applications identified were then assessed. The operating economics of HLAs were established and the market size for HLA services estimated by comparing HLA operating and economic characteristics with those of competing modes. The sensitivities of the market size to HLA characteristics were evaluated and the number and sizes of the vehicles required to service the more promising markets were defined. Important characteristics for future HLAs are discussed that were derived from the study of each application, including operational requirements, features enhancing profitability, military compatibility, improved design requirements, approach to entry into service, and institutional implications for design and operation.

Mettam, P. J.; Hansen, D.; Chabot, C.; Byrne, R.

1978-01-01

19

Heavy lift launch vehicles for 1995 and beyond  

NASA Astrophysics Data System (ADS)

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 and propulsion systems, rapid launch turnaround time, minimum hardware inventory, stage and component flexibility and commonality, and low operational costs. All ascent propulsion systems utilize liquid propellants, and overall launch vehicle stack height is minimized while maintaining a reasonable vehicle diameter. The ascent propulsion systems are based on the development of a new liquid oxygen/hydrocarbon booster engine and liquid oxygen/liquid hydrogen upper stage engine derived from today's SSME technology. Wherever possible, propulsion and avionics systems are contained in reusable propulsion/avionics modules that are recovered after each launch.

Toelle, R.

1985-09-01

20

Impact of Airfoils on Aerodynamic Optimization of Heavy Lift Rotorcraft  

NASA Technical Reports Server (NTRS)

Rotor airfoils were developed for two large tiltrotor designs, the Large Civil Tilt Rotor (LCTR) and the Military Heavy Tilt Rotor (MHTR). The LCTR was the most promising of several rotorcraft concepts produced by the NASA Heavy Lift Rotorcraft Systems Investigation. It was designed to carry 120 passengers for 1200 nm, with performance of 350 knots cruise at 30,000 ft altitude. A parallel design, the MHTR, had a notional mission of 40,000 Ib payload, 500 nm range, and 300 knots cruise at 4000 ft, 95 F. Both aircraft were sized by the RC code developed by the U. S. Army Aeroflightdynamics Directorate (AFDD). The rotors were then optimized using the CAMRAD II comprehensive analysis code. Rotor airfoils were designed for each aircraft, and their effects on performance analyzed by CAMRAD II. Airfoil design criteria are discussed for each rotor. Twist and taper optimization are presented in detail for each rotor, with discussions of performance improvements provided by the new airfoils, compared to current technology airfoils. Effects of stall delay and blade flexibility on performance are also included.

Acree, Cecil W., Jr.; Martin Preston B.; Romander, Ethan A.

2006-01-01

21

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. PMID:20040969

Wiwanitkit, Viroj

2008-01-01

22

Ground and Range Operations for a Heavy-Lift Vehicle: Preliminary Thoughts  

NASA Technical Reports Server (NTRS)

This paper discusses the ground and range operations for a Shuttle derived Heavy-Lift Vehicle being launched from the Kennedy Space Center on the Eastern range. Comparisons will be made between the Shuttle and a heavy lift configuration (SLS-ETF MPCV April 2011) by contrasting their subsystems. The analysis will also describe a simulation configuration with the potential to be utilized for heavy lift vehicle processing/range simulation modeling and the development of decision-making systems utilized by the range. In addition, a simple simulation model is used to provide the required critical thinking foundations for this preliminary analysis.

Rabelo, Luis; Zhu, Yanshen; Compton, Jeppie; Bardina, Jorge

2011-01-01

23

Performance, Loads and Stability of Heavy Lift Tiltrotors  

NASA Technical Reports Server (NTRS)

Summaries of rotor performance are presented for a 124,000-lb Large Civil Tilt Rotor (LCTR) design, along with isolated-rotor and fully-coupled wing/rotor aeroelastic stability. A major motivation of the present research is the effect of size on rotor dynamics. Simply scaling up existing rotor designs to the vehicle size under study would result in unacceptable rotor weight. The LCTR was the most promising of several large rotorcraft concepts produced by the NASA Heavy Lift Rotorcraft Systems Investigation. It was designed to carry 120 passengers for 1200 nm, with performance of 350 knots at 30,000 ft altitude. Design features included a low-mounted wing and hingeless rotors, with a very low cruise tip speed of 350 ft/sec. The LCTR was sized by the'RC code developed by the U. S. Army Aeroflightdynamics Directorate. The rotor was then optimized using the CAMRAD II comprehensive analysis code. The blade and wing structures were designed by Pennsylvania State University to meet the rotor loads calculated by CAMRAD II and wing loads required for certification. Aeroelastic stability was confirmed by further CAMRAD II analysis, based on the optimized rotor and wing designs.

Acree, Cecil W., Jr.; Johnson, Wayne

2006-01-01

24

Designing sustainable heavy lift launch vehicle architectures adaptability, lock-in, and system evolution  

E-print Network

Long term human space exploration depends on the development of a sustainable heavy lift launch vehicle (HLLV). But what exactly is sustainability in the context of launch systems and how can it addressed in the design ...

Silver, Matthew Robin

2005-01-01

25

Force control of heavy lift manipulators for high precision insertion tasks  

E-print Network

The inherent strength of robotic manipulators can be used to assist humans in performing heavy lifting tasks. These robots reduce manpower, reduce fatigue, and increase productivity. This thesis deals with the development ...

DiCicco, Matthew A. (Matthew Adam)

2005-01-01

26

High-precision position control of a heavy-lift manipulator in a dynamic environment  

E-print Network

This thesis considers the control of a heavy-lift serial manipulator operating on the deck of a large ocean vessel. This application presents a unique challenge for high- precision control because the system must contend ...

Garretson, Justin R. (Justin Richard)

2005-01-01

27

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

Microsoft Academic Search

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

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

1992-01-01

28

The design of a control architecture for a heavy-lift precision manipulator for use in contact with the environment  

E-print Network

Robotic manipulators can be used to enhance the strength and dexterity of a human user. This thesis considers the design of a controller for a heavy-lift manipulator for lifting and inserting payloads onto aircraft on the ...

Becker, William T. (William Theodore Leroy)

2006-01-01

29

The effect of heavy rain on an airfoil at high lift  

NASA Technical Reports Server (NTRS)

No serious studies of the relationship of heavy rain to aircraft safety were made until 1981 when it was suggested that the torrential rain which often occurs at the time of severe wind shear might substantially increase the danger to aircraft operating at slow speeds and high lift in the vicinity of airports. While these data were not published until early 1983, appropriate measures were taken by NASA to study the effect of heavy rain on the lift of wings typical of commercial aircraft. One of the aspects of these tests that seemed confirmed by the data was the existence of a velocity effect on the lift data. The data seemed to indicate that when all the normal non-dimensional aerodynamic parameters were used to sort out the data, the effect of velocity was not accounted for, as it usually is, by the effect of dynamic pressure. Indeed, the measured lift coefficients at high lift indicated a dropoff in lift coefficient for the same free-stream water content as velocity was increased. indicated a drop-off in lift coefficient for the same free-stream water content as velocity was increased.

Donaldson, Coleman DUP.; Sullivan, Roger D.

1987-01-01

30

Engine-Out Capabilities Assessment of Heavy Lift Launch Vehicles  

NASA Technical Reports Server (NTRS)

Engine-out (EO) is a condition that might occur during flight due to the failure of one or more engines. Protection against this occurrence can be called engine-out capability (EOC) whereupon significantly improved loss of mission may occur, in addition to reduction in performance and increased cost. A standardized engine-out capability has not been studied exhaustively as it pertains to space launch systems. This work presents results for a specific vehicle design with specific engines, but also uniquely provides an approach to realizing the necessity of EOC for any launch vehicle system design. A derived top-level approach to engine-out philosophy for a heavy lift launch vehicle is given herein, based on an historical assessment of launch vehicle capabilities. The methodology itself is not intended to present a best path forward, but instead provides three parameters for assessment of a particular vehicle. Of the several parameters affected by this EOC, the three parameters of interest in this research are reliability (Loss of Mission (LOM) and Loss of Crew (LOC)), vehicle performance, and cost. The intent of this effort is to provide insight into the impacts of EO capability on these parameters. The effects of EOC on reliability, performance and cost are detailed, including how these important launch vehicle metrics can be combined to assess what could be considered overall launch vehicle affordability. In support of achieving the first critical milestone (Mission Concept Review) in the development of the Space Launch System (SLS), a team assessed two-stage, large-diameter vehicles that utilized liquid oxygen (LOX)-RP propellants in the First Stage and LOX/LH2 propellant in the Upper Stage. With multiple large thrust-class engines employed on the stages, engine-out capability could be a significant driver to mission success. It was determined that LOM results improve by a factor of five when assuming EOC for both Core Stage (CS) (first stage) and Upper Stage (US) EO, assuming a reference launch vehicle with 5 RP engines on the CS and 3 LOX/LH2 engines on the US. The benefit of adding both CS and US engine-out capability is significant. When adding EOC for either first or second stages, there is less than a 20% benefit. Performance analysis has shown that if the vehicle is not protected for EO during the first part of the flight and only protected in the later part of the flight, there is a diminishing performance penalty, as indicated by failures occurring in the first stage at different times. This work did not consider any options to abort. While adding an engine for EOC drives cost upward, the impact depends on the number of needed engines manufactured per year and the launch manifest. There is a significant cost savings if multiple flights occur within one year. Flying two flights per year would cost approximately $4,000 per pound less than the same configuration with one flight per year, assuming both CS and US EOC. The cost is within 15% of the cost of one flight per year with no engine-out capability for the same vehicle. This study can be extended to other launch vehicles. While the numbers given in this paper are specific to a certain vehicle configuration, the process requires only a high level of data to allow an analyst to draw conclusions. The weighting of each of the identified parameters will determine the optimization of each launch vehicle. The results of this engine-out assessment provide a means to understand this optimization while maintaining an unbiased perspective.

Holladay, Jon; Baggett, Keithe; Thrasher, Chad; Bellamy, K. Scott; Feldman, Stuart

2012-01-01

31

Occupational Lifting, Fetal Death and Preterm Birth: Findings from the Danish National Birth Cohort Using a Job Exposure Matrix  

PubMed Central

Objective We examined the association between occupational lifting during pregnancy and risk of fetal death and preterm birth using a job exposure matrix (JEM). Methods For 68,086 occupationally active women in the Danish National Birth Cohort, interview information on occupational lifting was collected around gestational week 16. We established a JEM based on information from women, who were still pregnant when interviewed. The JEM provided mean total loads lifted per day within homogeneous exposure groups as informed by job and industry codes. All women were assigned an exposure estimate from the JEM. We used Cox regression models with gestational age as underlying time variable and adjustment for covariates. Results We observed 2,717 fetal deaths and 3,128 preterm births within the study cohort. No exposure-response relation was observed for fetal death, but for women with a prior fetal death, we found a hazard ratio (HR) of 2.87 (95% CI 1.37, 6.01) for stillbirth (fetal death ?22 completed gestational weeks) among those who lifted >200 kg/day. For preterm birth, we found an exposure-response relation for primigravid women, reaching a HR of 1.43 (95% CI 1.13, 1.80) for total loads >200 kg per day. These findings correspond to an excess fraction of 11% for stillbirth and 10% for preterm birth. Conclusion We found an increased risk of stillbirth among women with a prior fetal death, who lifted >200 kg/day, and an exposure-response relationship between occupational lifting and preterm birth among primigravid women. The study adds to a large body of prospective studies on occupational lifting and adverse pregnancy outcomes by refined exposure assessment. PMID:24614129

Mocevic, Emina; Svendsen, Susanne Wulff; Jřrgensen, Kristian Tore; Frost, Poul; Bonde, Jens Peter

2014-01-01

32

Aeromechanical stability analysis of a multirotor vehicle with application to hybrid heavy lift helicopter dynamics  

NASA Technical Reports Server (NTRS)

The Hybrid Heavy Lift Helicopter (HHLH) is a potential candidate vehicle aimed at providing heavy lift capability at low cost. This vehicle consists of a buoyant envelope attached to a supporting structure. Four rotor systems are also attached to the supporting structure. Nonlinear equations of motion capable of modeling the dynamics of this multi-rotor/support frame/vehicle system have been developed and used to study the fundamental aeromechanical stability characteristics of this class of vehicles. The mechanism of coupling between the blades, supporting structure and rigid body modes is identified and the effect of buoyancy ratio (buoyant lift/total weight) on the vehicle dynamics is studied. It is shown that dynamics effects have a major role in the design of such vehicles. The analytical model developed is also useful for studying the aeromechanical stability of single rotor and tandem rotor coupled rotor/fuselage systems.

Venkatesan, C.; Friedmann, P. P.

1984-01-01

33

Two-axis hydraulic joint for high speed, heavy lift robotic operations  

SciTech Connect

A hydraulically driven universal joint was developed for a heavy lift, high speed nuclear waste remediation application. Each axis is driven by a simple hydraulic cylinder controlled by a jet pipe servovalve. Servovalve behavior is controlled by a force feedback control system, which damps the hydraulic resonance. A prototype single joint robot was built and tested. A two joint robot is under construction.

Vaughn, M.R.; Robinett, R.D.; Phelan, J.R.; VanZuiden, D.M.

1994-04-01

34

The effects of atmospheric turbulence on a quadrotor heavy lift airship  

NASA Technical Reports Server (NTRS)

The response of a quadrotor heavy lift airship to atmospheric turbulence is evaluated using a four-point input model. Results show interaction between gust inputs and the characteristic modes of the vehicle's response. Example loop closures demonstrate tradeoffs between response regulation and structural loads. Vehicle responses to a tuned discrete wave front compare favorably with the linear results and illustrate characteristic HLA motion.

Tischler, M. B.; Jex, H. R.

1982-01-01

35

Vehicle concepts and technology requirements for buoyant heavy-lift systems  

NASA Technical Reports Server (NTRS)

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. Applications involving payloads of from 15 tons up to 800 tons were identified. The buoyant quad-rotor concept is discussed in detail, including the history of its development, current estimates of performance and economics, currently perceived technology requirements, and recent research and technology development. It is concluded that the buoyant quad-rotor, and possibly other buoyant vehicle concepts, has the potential of satisfying the market for very heavy vertical lift but that additional research and technology development are necessary. Because of uncertainties in analytical prediction methods and small-scale experimental measurements, there is a strong need for large or full-scale experiments in ground test facilities and, ultimately, with a flight research vehicle.

Ardema, M. D.

1981-01-01

36

Baggage handler seniority and musculoskeletal symptoms: is heavy lifting in awkward positions associated with the risk of pain?  

PubMed Central

Objectives Heavy lifting is associated with musculoskeletal disorders but it is unclear whether it is related to acute reversible effects or to chronic effects from cumulated exposure. The aim of this study was to examine whether musculoskeletal symptoms in Danish airport baggage handlers were associated with their seniority as baggage handler, indicating chronic effects from cumulated workload. Methods We established a group of baggage handlers employed at Copenhagen Airport during the period 1983–2012 (n=3092) and a reference group of men in other unskilled occupations with less heavy work (n=2478). Data regarding work history, lifestyle and musculoskeletal symptoms were collected using a self-administered questionnaire (response rate 70.1% among baggage handlers and 68.8% among the reference group). Results The ORs of self-reported musculoskeletal symptoms during the last 12?months in the neck/upper back, lower back, shoulders, elbows, wrists, hips and knees were significantly higher in baggage handlers than in the reference group. These differences were explained by significant linear effects of baggage handler seniority for six anatomical regions. Adjustment for age, body mass index, smoking and leisure-time physical activity did not change these results. The findings were stable over age strata and among present and former baggage handlers. Conclusions The risk of musculoskeletal symptoms in six anatomical regions increased with increasing seniority as a baggage handler. This is consistent with the assumption that cumulated heavy lifting may cause chronic or long-lasting musculoskeletal symptoms. However, we cannot exclude that other factors related to baggage handler seniority may explain some of the associations. PMID:24293209

Bern, Stine Hvid; Brauer, Charlotte; M?ller, Karina Lauenborg; Koblauch, Henrik; Thygesen, Lau Caspar; Simonsen, Erik Bruun; Alkjaer, Tine; Bonde, Jens Peter; Mikkelsen, Sigurd

2013-01-01

37

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

NASA Technical Reports Server (NTRS)

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.

1990-01-01

38

Lunar Lander Offloading Operations Using a Heavy-Lift Lunar Surface Manipulator System  

NASA Technical Reports Server (NTRS)

This study investigates the feasibility of using a heavy-lift variant of the Lunar Surface Manipulator System (LSMS-H) to lift and handle a 12 metric ton payload. Design challenges and requirements particular to handling heavy cargo were examined. Differences between the previously developed first-generation LSMS and the heavy-lift version are highlighted. An in-depth evaluation of the tip-over risk during LSMS-H operations has been conducted using the Synergistic Engineering Environment and potential methods to mitigate that risk are identified. The study investigated three specific offloading scenarios pertinent to current Lunar Campaign studies. The first involved offloading a large element, such as a habitat or logistics module, onto a mobility chassis with a lander-mounted LSMS-H and offloading that payload from the chassis onto the lunar surface with a surface-mounted LSMS-H. The second scenario involved offloading small pressurized rovers with a lander-mounted LSMS-H. The third scenario involved offloading cargo from a third-party lander, such as the proposed ESA cargo lander, with a chassis-mounted LSMS-H. In all cases, the analyses show that the LSMS-H can perform the required operations safely. However, Chariot-mounted operations require the addition of stabilizing outriggers, and when operating from the Lunar surface, LSMS-H functionality is enhanced by adding a simple ground anchoring system.

Jefferies, Sharon A.; Doggett, William R.; Chrone, Jonathan; Angster, Scott; Dorsey, John T.; Jones, Thomas C.; Haddad, Michael E.; Helton, David A.; Caldwell, Darrell L., Jr.

2010-01-01

39

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

40

Ares V: Designing the Heavy Lift Capability to Explore the Moon  

NASA Technical Reports Server (NTRS)

NASA's Vision for Exploration requires a safe, efficient, reliable, and versatile launch vehicle capable ofplacing large payloads into Earth orbit for transfer to the Moon and destinations beyond. The Ares V Cargo Launch Vehicle (CaLV) will provide this heavy lift capability. The Ares V launch concept is shown. When it stands on the launch pad at Kennedy Space Center late in the next decade, the Ares V stack will be almost 360 feet fall. As currently envisioned, it will lift 136 metric tons (300,000 pounds) to a 30-by-160 nautical mile orbit at 28.5-degrees inclination, or 55 metric tons (120,000 pounds) to trans-lunar injection. This paper will cover the latest developments in the Ares V project in 2007 and discuss future activities.

Sumrall, John P.; McArthur, Craig

2007-01-01

41

Exploration Launch Projects RS-68B Engine Requirements for NASA's Heavy Lift Ares V  

NASA Technical Reports Server (NTRS)

NASA's Vision for Exploration requires a safe, efficient, reliable, and versatile launch vehicle capable of placing large payloads into Earth orbit for transfer to the Moon and destinations beyond. The Ares V Cargo Launch Vehicle (CaLV) will provide this heavy lift capability. The Ares V launch concept is shown in Fig. 1. When it stands on the launch pad at Kennedy Space Center late in the next decade, the Ares V stack will be almost 360 feet tall. As currently envisioned, it will lift 133,000 to 144,000 pounds to trans-lunar injection, depending on the length of loiter time on Earth orbit. This presentation will provide an overview of the Constellation architecture, the Ares launch vehicles, and, specifically, the latest developments in the RS-68B engine for the Ares V.

Sumrall, John P.; McArthur, J. Craig; Lacey, Matt

2007-01-01

42

EXPOSURE TO HEAVY PHYSICAL OCCUPATIONAL ACTIVITIES DURING WORKING-LIFE AND BONE MINERAL DENSITY AT THE HIP AT RETIREMENT AGE  

PubMed Central

Background People in sedentary occupations are at increased risk of hip fracture. Hip fracture is significantly associated with low bone mineral density (BMD) measured at the hip. Physical activity is important in the development and maintenance of BMD but the effects of occupational physical activity on bone health are unclear. We investigated the influence of lifetime physical activity on bone mineral density at the hip. Methods This was a cross-sectional epidemiological study of the associations between total hip BMD measured by dual-energy X-ray absorptiometry at retirement age and lifetime exposure to occupational physical workload (standing/walking ?4 hours/day; lifting ?25 kg; energetic work sufficient to induce sweating and manual work). Results Complete data on occupational exposures were available for 860 adults (488 men and 372 women) who had worked ? 20 years. Their mean age was 65 years and many reported heavy physical workplace activities over prolonged durations. There were no statistically significant associations between total hip BMD and any of these measures of lifetime occupational physical activity in men or women. Conclusion Lifetime cumulative occupational activity was not associated with hip bone mineral density at retirement age. Our findings suggest that, if sedentary work conveys an increased risk of hip fracture, it is unlikely that the mechanism is through reductions in bone mineral density at the hip and may relate to other physical effects, such as falls risk. Further studies will be needed to test this hypothesis. PMID:24619156

Walker-Bone, K; D'Angelo, S; Syddall, HE; Palmer, KT; Cooper, C; Coggon, DNM; Dennison, EM

2014-01-01

43

Definition of avionics concepts for a heavy lift cargo vehicle. Volume 1: Executive summary  

NASA Technical Reports Server (NTRS)

A cost effective, multiuser simulation, test, and demonstration facility to support the development of avionics systems for future space vehicles is examined. The technology needs and requirements of future Heavy Lift Cargo Vehicles (HLCVs) are analyzed and serve as the basis for sizing of the avionics facility, although the lab is not limited in use to support of HLCVs. Volume 1 provides a summary of the vehicle avionics trade studies, the avionics lab objectives, a summary of the lab's functional requirements and design, physical facility considerations, and cost estimates.

1989-01-01

44

Definition of avionics concepts for a heavy lift cargo vehicle, volume 2  

NASA Technical Reports Server (NTRS)

A cost effective, multiuser simulation, test, and demonstration facility to support the development of avionics systems for future space vehicles is defined. The technology needs and requirements of future Heavy Lift Cargo Vehicles (HLCVs) are analyzed and serve as the basis for sizing of the avionics facility although the lab is not limited in use to support of HLCVs. Volume 2 is the technical volume and provides the results of the vehicle avionics trade studies, the avionics lab objectives, the lab's functional requirements and design, physical facility considerations, and a summary cost estimate.

1989-01-01

45

Foundation for Heavy Lift: Early Developments in the Ares V Cargo Launch Vehicle  

NASA Technical Reports Server (NTRS)

The Ares V Cargo Launch Vehicle (CaLV) is NASA's primary vessel for safe, reliable delivery of the Lunar Surface Access Module (LSAM) and other resources into Earth orbit, as articulated in the U.S. Vision for Space Exploration.' The Ares V launch concept is shown. The foundation for this heavy-lift companion to the Ares I Crew Launch Vehicle (CLV) is taking shape within NASA and with its government and industry partners. This paper will address accomplishments in the Ares V Launch Vehicle during 2006 and 2007 and offer a preview of future activities.

Sumrall, John P.; McArthur, J. Craig

2007-01-01

46

Foundation for Heavy Lift - Early Developments in the Ares V Launch Vehicle  

NASA Technical Reports Server (NTRS)

The Ares V Cargo Launch Vehicle (CaLV) is NASA's primary vessel for safe, reliable delivery of the Lunar Surface Access Module (LSAM) and other resources into Earth orbit, as articulated in the U.S. Vision for Space Exploration. The Ares V launch concept is shown. The foundation for this heavy-lift companion to the Ares I Crew Launch Vehicle (CLV) is taking shape within NASA and with its government and industry partners. This paper will address accomplishments in the Ares V Launch Vehicle during 2006 and 2007 and offer a preview of future activities.

McArthur, J. Craig; Pannell, Bill; Lacey, Matt

2007-01-01

47

Advanced transportation system studies. Technical area 2: Heavy lift launch vehicle development. Volume 2; Technical Results  

NASA Technical Reports Server (NTRS)

Sections 10 to 13 of the Advanced Transportation System Studies final report are included in this volume. Section 10 contains a copy of an executive summary that was prepared by Lockheed Space Operations Company (LSOC) to document their support to the TA-2 contract during the first-year period of performance of the contract, May 1992 through May 1993. LSOC participated on the TA-2 contract as part of the concurrent engineering launch system definition team, and provided outstanding heavy lift launch vehicle (HLLV) ground operations requirements and concept assessments for Lockheed Missiles and Space Company (LMSC) through an intercompany work transfer as well as providing specific HLLV ground operations assessments at the direction of NASA KSC through KSC funding that was routed to the TA-2 contract. Section 11 contains a copy of a vehicle-independent, launch system health management requirements assessment. The purpose of the assessment was to define both health management requirements and the associated interfaces between a generic advanced transportation system launch vehicle and all related elements of the entire transportation system, including the ground segment. Section 12 presents the major TA-2 presentations provided to summarize the significant results and conclusions that were developed over the course of the contract. Finally, Section 13 presents the design and assessment report on the first lunar outpost heavy lift launch vehicle.

1995-01-01

48

A Near-Term, High-Confidence Heavy Lift Launch Vehicle  

NASA Technical Reports Server (NTRS)

The use of well understood, legacy elements of the Space Shuttle system could yield a near-term, high-confidence Heavy Lift Launch Vehicle that offers significant performance, reliability, schedule, risk, cost, and work force transition benefits. A side-mount Shuttle-Derived Vehicle (SDV) concept has been defined that has major improvements over previous Shuttle-C concepts. This SDV is shown to carry crew plus large logistics payloads to the ISS, support an operationally efficient and cost effective program of lunar exploration, and offer the potential to support commercial launch operations. This paper provides the latest data and estimates on the configurations, performance, concept of operations, reliability and safety, development schedule, risks, costs, and work force transition opportunities for this optimized side-mount SDV concept. The results presented in this paper have been based on established models and fully validated analysis tools used by the Space Shuttle Program, and are consistent with similar analysis tools commonly used throughout the aerospace industry. While these results serve as a factual basis for comparisons with other launch system architectures, no such comparisons are presented in this paper. The authors welcome comparisons between this optimized SDV and other Heavy Lift Launch Vehicle concepts.

Rothschild, William J.; Talay, Theodore A.

2009-01-01

49

NASA's Space Launch System: A Heavy-Lift Platform for Entirely New Missions  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration s (NASA's) Space Launch System (SLS) will contribute a new capability for human space flight and scientific missions beyond low-Earth orbit. The SLS Program, managed at NASA s Marshall Space Fight Center, will develop the heavy-lift vehicle that will launch the Orion Multi-Purpose Crew Vehicle (MPCV), equipment, supplies, and major science missions. Orion will carry crews to space, provide emergency abort capability, sustain the crew during space travel, and provide safe reentry from deep-space return velocities. Supporting Orion s first autonomous flight to lunar orbit and back in 2017 and its first crewed flight in 2021, the SLS ultimately offers a flexible platform for both human and scientific exploration. The SLS plan leverages legacy infrastructure and hardware in NASA s inventory, as well as continues with advanced propulsion technologies now in development, to deliver an initial 70 metric ton (t) lift capability in 2017, evolving to a 130-t capability after 2021, using a block upgrade approach. This paper will give an overview of the SLS design and management approach against a backdrop of the missions it will support. It will detail the plan to deliver the initial SLS capability to the launch pad in the near term, as well as summarize the innovative approaches the SLS team is applying to deliver a safe, affordable, and sustainable long-range capability for entirely new missions opening a new realm of knowledge and a world of possibilities for multiple partners. Design reference missions that the SLS is being planned to support include asteroids, Lagrange Points, and Mars, among others. The Agency is developing its mission manifest in parallel with the development of a heavy-lift flagship that will dramatically increase total lift and volume capacity beyond current launch vehicle options, reduce trip times, and provide a robust platform for conducting new missions destined to rewrite textbooks with the information they deliver, while creating a framework for further collaboration among domestic and international partners, and potentially spurring economic expansion into new markets.

Creech, Stephen A.

2012-01-01

50

NASA's Space Launch System: A Heavy-Lift Platform for Entirely New Missions  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration's (NASA's) Space Launch System (SLS) will contribute a new capability for human space flight and scientific missions beyond low-Earth orbit (LEO). The SLS Program, managed at NASA s Marshall Space Flight Center, will develop the heavy-lift vehicle that will launch the Orion Multi-Purpose Crew Vehicle (MPCV), equipment, supplies, and major science missions for exploration and discovery. Orion will carry crews to space, provide emergency abort capability, sustain the crew during space travel, and provide safe reentry from deep-space return velocities. Supporting Orion s first autonomous flight to lunar orbit and back in 2017 and its first crewed flight in 2021, the SLS ultimately offers a flexible platform for both human and scientific exploration. The SLS plan leverages legacy infrastructure and hardware in NASA s inventory, as well as continues with advanced technologies now in development, to deliver an initial 70 metric ton (t) lift capability in 2017, evolving to a 130-t capability, using a block upgrade approach. This paper will give an overview of the SLS design and management approach against a backdrop of the missions it will support. It will detail the plan to deliver the initial SLS capability to the launch pad in the near term, as well as summarize the innovative approaches the SLS team is applying to deliver a safe, affordable, and sustainable long-range capability for entirely new missions-opening a new realm of knowledge and a world of possibilities for multiple partners. Design reference missions that the SLS is being planned to support include Mars, Jupiter, Lagrange Points, and near-Earth asteroids (NEAs), among others. The Agency is developing its mission manifest in parallel with the development of a heavy-lift flagship that will dramatically increase total lift and volume capacity beyond current launch vehicle options, reduce trip times, and provide a robust platform for conducting new missions destined to rewrite textbooks with the information they deliver, while creating a framework for further collaboration among domestic and international partners, and potentially spurring economic expansion into new markets.

Creech, Stephen D.

2012-01-01

51

Next Generation Heavy-Lift Launch Vehicle: Large Diameter, Hydrocarbon-Fueled Concepts  

NASA Technical Reports Server (NTRS)

With the passage of the 2010 NASA Authorization Act, NASA was directed to begin the development of the Space Launch System (SLS) as a follow-on to the Space Shuttle Program. The SLS is envisioned as a heavy lift launch vehicle that will provide the foundation for future large-scale, beyond low Earth orbit (LEO) missions. Supporting the Mission Concept Review (MCR) milestone, several teams were formed to conduct an initial Requirements Analysis Cycle (RAC). These teams identified several vehicle concept candidates capable of meeting the preliminary system requirements. One such team, dubbed RAC Team 2, was tasked with identifying launch vehicles that are based on large stage diameters (up to the Saturn V S-IC and S-II stage diameters of 33 ft) and utilize high-thrust liquid oxygen (LOX)/RP engines as a First Stage propulsion system. While the trade space for this class of LOX/RP vehicles is relatively large, recent NASA activities (namely the Heavy Lift Launch Vehicle Study in late 2009 and the Heavy Lift Propulsion Technology Study of 2010) examined specific families within this trade space. Although the findings from these studies were incorporated in the Team 2 activity, additional branches of the trade space were examined and alternative approaches to vehicle development were considered. Furthermore, Team 2 set out to define a highly functional, flexible, and cost-effective launch vehicle concept. Utilizing this approach, a versatile two-stage launch vehicle concept was chosen as a preferred option. The preferred vehicle option has the capability to fly in several different configurations (e.g. engine arrangements) that gives this concept an inherent operational flexibility which allows the vehicle to meet a wide range of performance requirements without the need for costly block upgrades. Even still, this concept preserves the option for evolvability should the need arise in future mission scenarios. The foundation of this conceptual design is a focus on low cost and effectiveness rather than efficiency or cutting-edge technology. This paper details the approach and process, as well as the trade space analysis, leading to the preferred vehicle concept.

Holliday, Jon; Monk, Timothy; Adams, Charles; Campbell, Ricky

2012-01-01

52

The Business Case for Spiral Development in Heavy Lift Launch Vehicle Systems  

NASA Technical Reports Server (NTRS)

Performance capabilities of a specific combination of the Space Shuttle external tank and various liquid engines in an in-line configuration, two-stage core vehicle with multiple redesigned solid rocket motor strap-ons are reexamined. This concept proposes using existing assets, hardware, and capabilities that are already crew-rated, flight certified, being manufactured under existing contracts, have a long history of component and system ground testing, and have been flown for over 20 yr. This paper goes beyond describing potential performance capabilities of specific components to discuss the overall system feasibility-from end to end, start to finish-describing the inherent cost advantages of the Spiral Development concept, which builds on existing capabilities and assets, as opposed to starting up a "fresh sheet" heavy-lift launch vehicle program from scratch.

Farr, Rebecca A.; Christensen, David L.; Keith, Edward L.

2005-01-01

53

Structure and properties of polyethylene films used in heavy lift balloons  

NASA Technical Reports Server (NTRS)

The following features of five polyethylene films used by NASA in the construction of heavy lift balloons have been examined: molecular weight, molecular weight distribution, branching, melting behavior, density, surface texture, birefringence, orientation of crystalline regions, unlaxial deformation in the machine and transverse directions, and the effect of sample geometry and strain rate on deformation behavior. The goal of this exploratory study was to determine whether there are significant differences in any of the above mentioned features, or combination of features between the films. The acquisition of such information is a first step towards determining whether there are any specific correlations between film characteristics and the incidence of catastrophic failure of balloons during ascent through the troposphere. This exploratory study has resulted in the identification of similarities and differences between various features of the films.

Khoury, F.; Crissman, J. M.; Fanconi, B. M.; Wagner, H. L.; Botz, L. H.

1985-01-01

54

Final design report of a personnel launch system and a family of heavy lift launch vehicles  

NASA Technical Reports Server (NTRS)

The objective was to design both a Personnel Launch System (PLS) and a family of Heavy Lift Launch Vehicles (FHLLVs) that provide low cost and efficient operation in missions not suited for the Shuttle. The PLS vehicle is designed primarily for space station crew rotation and emergency crew return. The final design of the PLS vehicle and its interior is given. The mission of the FHLLVs is to place large, massive payloads into Earth orbit with payload flexibility being considered foremost in the design. The final design of three launch vehicles was found to yield a payload capacity range from 20 to 200 mt. These designs include the use of multistaged, high thrust liquid engines mounted on the core stages of the rocket.

Tupa, James; Merritt, Debbie; Riha, David; Burton, Lee; Kubinski, Russell; Drake, Kerry; Mann, Darrin; Turner, Ken

1991-01-01

55

Simulation of Heavy Lift Airship dynamics over large ranges of incidence and speed  

NASA Technical Reports Server (NTRS)

A nonlinear, multibody, six-degrees-of-freedom digital simulation has been developed to study generic Heavy Lift Airship (HLA) dynamics and control. The basic aerodynamic functions developed to model the hull, tail, and rotor loads continuously over all incidence ranges are reviewed and applied to a Quadrotor HLA with a low fineness ratio hull and a small vee-tail. Trim calculations for a test vehicle suggest control power deficiencies in crosswind stationkeeping for the unloaded vehicle. Gust responses show the importance of correctly calculating loads due to accelerated relative motion of air and hull. Numerically linearized dynamics for the test vehicle show the existence of a divergent yaw mode, and an oscillatory pitch mode whose stability characteristics are sensitive to flight speed. A considerable improvement in the vehicle's stability and response results from a simple multi-axis closed-loop control system operating on the rotors and propeller blades.

Tischler, M. B.; Jex, H. R.; Ringland, R. F.

1981-01-01

56

Heavy-lift vehicle-launched Space Station method and apparatus  

NASA Technical Reports Server (NTRS)

Methods and apparatus are provided for a single heavy-lift launch to place a complete, operational space station on-orbit. A payload including the space station takes the place of a shuttle orbiter using the launch vehicle of the shuttle orbiter. The payload includes a forward shroud, a core module, a propulsion module, and a transition module between the core module and the propulsion module. The essential subsystems are preintegrated and verified on Earth. The core module provides means for attaching international modules with minimum impact to the overall design. The space station includes six control moment gyros for selectably operating in either LVLH (local-vertical local-horizontal) or SI (solar inertial) flight modes.

Wade, Donald C. (inventor); Delafuente, Horacio M. (inventor); Berka, Reginald B. (inventor); Rickman, Steven L. (inventor); Castro, Edgar O. (inventor); Nagy, Kornel (inventor); Wesselski, Clarence J. (inventor); Pelischek, Timothy E. (inventor); Schliesing, John A. (inventor)

1995-01-01

57

A New Heavy-Lift Capability for Space Exploration: NASA's Ares V Cargo Launch Vehicle  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration (NASA) is developing new launch systems and preparing to retire the Space Shuttle by 2010, as directed in the United States (U.S.) Vision for Space Exploration. The Ares I Crew Launch Vehicle (CLV) and the Ares V heavy-lift Cargo Launch Vehicle (CaLV) systems will build upon proven, reliable hardware derived from the Apollo-Saturn and Space Shuttle programs to deliver safe, reliable, affordable space transportation solutions. This approach leverages existing aerospace talent and a unique infrastructure, as well as legacy knowledge gained from nearly 50 years' experience developing space hardware. Early next decade, the Ares I will launch the new Orion Crew Exploration Vehicle (CEV) to the International Space Station (ISS) or to low-Earth orbit for trips to the Moon and, ultimately, Mars. Late next decade, the Ares V's Earth Departure Stage will carry larger payloads such as the lunar lander into orbit, and the Crew Exploration Vehicle will dock with it for missions to the Moon, where astronauts will explore new territories and conduct science and technology experiments. Both Ares I and Ares V are being designed to support longer future trips to Mars. The Exploration Launch Projects Office is designing, developing, testing, and evaluating both launch vehicle systems in partnership with other NASA Centers, Government agencies, and industry contractors. This paper provides top-level information regarding the genesis and evolution of the baseline configuration for the Ares V heavy-lift system. It also discusses riskbased, management strategies, such as building on powerful hardware and promoting common features between the Ares I and Ares V systems to reduce technical, schedule, and cost risks, as well as development and operations costs. Finally, it summarizes several notable accomplishments since October 2005, when the Exploration Launch Projects effort officially kicked off, and looks ahead at work planned for 2007 and beyond.

Sumrall, John P.; McArthur, J. Craig

2007-01-01

58

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

59

A New Heavy-Lift Capability for Space Exploration: NASA's Ares V Cargo Launch Vehicle  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration (NASA) is developing new launch systems in preparation for the retirement of the Space Shuttle by 2010, as directed in the United States (U.S.) Vision for Space Exploration. The Ares I Crew Launch Vehicle (CLV) and the Ares V heavy-lift Cargo Launch Vehicle (CaLV) systems will build upon proven, reliable hardware derived from the Apollo Saturn (1961 to 1975) and Space Shuttle (1972 to 2010) programs to deliver safe, reliable, affordable space transportation solutions. This approach leverages existing aerospace talent and a unique infrastructure, as well as the vast amount of legacy knowledge gained from almost a half-century of hard-won experience in the space enterprise. Beginning early next decade, the Ares I will launch the new Crew Exploration Vehicle (CEV) to the International Space Station (ISS) or to low-Earth orbit for trips to the Moon and, ultimately, Mars. Late next decade, the Ares V's Earth Departure Stage will carry larger payloads such as the lunar lander into orbit, and the Crew Exploration Vehicle will dock with it for missions to the Moon, where astronauts will explore new territories and conduct science and technology experiments. Both the Ares I and Ares V systems are being designed to support longer future trips to Mars. The Exploration Launch Projects Office, located at NASA's Marshall Space Flight Center, is designing, developing, testing, and evaluating both launch vehicle systems in partnership with other NASA Centers, Government agencies, and industry contractors. This paper provides top-level information regarding the genesis and evolution of the baseline configuration for the Ares V heavy-lift system. It also touches on risk-based management strategies, such as building on powerful hardware and promoting common features between the Ares I and Ares V systems to reduce technical, schedule, and cost risks, as well as development and operations costs. Finally, it gives a summary of several notable accomplishments over the past year, since the Exploration Launch Projects effort officially kicked off in October 2005, and looks ahead at work planned for 2007 and beyond.

Sumrall, John P.

2006-01-01

60

Update on the Ares V to Support Heavy Lift for U.S. Space Exploration Policy  

NASA Technical Reports Server (NTRS)

When NASA's Ares V cargo launch vehicle begins flying late next decade, its capabilities will significantly exceed the 1960s-era Saturn V. It will send more crew and cargo to more places on the lunar surface than Apollo and provide ongoing support to a permanent lunar outpost that will open the Moon to greater exploration, science and adventure than ever before. Moreover, it will restore the United States heavy-lift capability, which can support human and robotic exploration for decades to come. Ares V remains in a pre-design analysis cycle stage pending a planned Authority to Proceed (ATP) in late 2010. Ares V benefits from the decision to draw from heritage hardware and its commonality with the Ares I crew launch vehicle, which completed its preliminary design review (PDR) in September 2008. Most of the work on Ares V to date has been focused on refining the vehicle design through a variety of internal studies. This paper will provide background information on the Ares V evolution, emphasizing the vehicle configuration as it exists today.

Sumrall, John P.; Creech, Steve

2008-01-01

61

Advanced Transportation System Studies Technical Area 2 (TA-2) Heavy Lift Launch Vehicle Development Contract. Volume 2; Technical Results  

NASA Technical Reports Server (NTRS)

The sections in this report include: Single Stage to Orbit (SSTO) Design Ground-rules; Operations Issues and Lessons Learned; Vertical-Takeoff/Landing Versus Vertical-Takeoff/Horizontal-Landing; SSTO Design Results; SSTO Simulation Results; SSTO Assessment Results; SSTO Sizing Tool User's Guide; SSto Turnaround Assessment Report; Ground Operations Assessment First Year Executive Summary; Health Management System Definition Study; Major TA-2 Presentations; First Lunar Outpost Heavy Lift Launch Vehicle Design and Assessment; and the section, Russian Propulsion Technology Assessment Reports.

1995-01-01

62

Heavy lift vehicles for transportation to a low earth orbit Space Station for assembly of a Human to Mars Mission  

NASA Technical Reports Server (NTRS)

Heavy lift vehicle configurations are proposed which will meet the requirements for transporting the elements of a Human to Mars Mission to a low earth orbit Space Station for assembly. Both near term derivative type vehiles as well as advanced technology vehicles are considered. The capability of these vehicles to accommodate the precursor missions are also examined. The implications on launch vehicle payload accommodation design and orbital operations are discussed.

Swalley, Frank E.

1989-01-01

63

A study of aeroelastic and structural dynamic effects in multi-rotor systems with application to hybrid heavy lift vehicles  

NASA Technical Reports Server (NTRS)

An aeroelastic model suitable for the study of aeroelastic and structural dynamic effects in multirotor vehicles simulating a hybrid heavy lift vehicle was developed and applied to the study of a number of diverse problems. The analytical model developed proved capable of modeling a number of aeroelastic problems, namely: (1) isolated blade aeroelastic stability in hover and forward flight, (2) coupled rotor/fuselage aeromechanical problem in air or ground resonance, (3) tandem rotor coupled rotor/fuselage problems, and (4) the aeromechanical stability of a multirotor vehicle model representing a hybrid heavy lift airship (HHLA). The model was used to simulate the ground resonance boundaries of a three bladed hingeless rotor model, including the effect of aerodynamic loads, and the theoretical predictions compared well with experimental results. Subsequently the model was used to study the aeromechanical stability of a vehicle representing a hybrid heavy lift airship, and potential instabilities which could occur for this type of vehicle were identified. The coupling between various blade, supporting structure and rigid body modes was identified.

Friedmann, P. P.

1984-01-01

64

Advanced grid-stiffened composite shells for applications in heavy-lift helicopter rotor blade spars  

NASA Astrophysics Data System (ADS)

Modern rotor blades are constructed using composite materials to exploit their superior structural performance compared to metals. Helicopter rotor blade spars are conventionally designed as monocoque structures. Blades of the proposed Heavy Lift Helicopter are envisioned to be as heavy as 800 lbs when designed using the monocoque spar design. A new and innovative design is proposed to replace the conventional spar designs with light weight grid-stiffened composite shell. Composite stiffened shells have been known to provide excellent strength to weight ratio and damage tolerance with an excellent potential to reduce weight. Conventional stringer--rib stiffened construction is not suitable for rotor blade spars since they are limited in generating high torsion stiffness that is required for aeroelastic stability of the rotor. As a result, off-axis (helical) stiffeners must be provided. This is a new design space where innovative modeling techniques are needed. The structural behavior of grid-stiffened structures under axial, bending, and torsion loads, typically experienced by rotor blades need to be accurately predicted. The overall objective of the present research is to develop and integrate the necessary design analysis tools to conduct a feasibility study in employing grid-stiffened shells for heavy-lift rotor blade spars. Upon evaluating the limitations in state-of-the-art analytical models in predicting the axial, bending, and torsion stiffness coefficients of grid and grid-stiffened structures, a new analytical model was developed. The new analytical model based on the smeared stiffness approach was developed employing the stiffness matrices of the constituent members of the grid structure such as an arch, helical, or straight beam representing circumferential, helical, and longitudinal stiffeners. This analysis has the capability to model various stiffening configurations such as angle-grid, ortho-grid, and general-grid. Analyses were performed using an existing state-of-the-art and newly developed model to predict the torsion, bending, and axial stiffness of grid and grid-stiffened structures with various stiffening configurations. These predictions were compared to results generated using finite element analysis (FEA) to observe excellent correlation (within 6%) for a range of parameters for grid and grid-stiffened structures such as grid density, stiffener angle, and aspect ratio of the stiffener cross-section. Experimental results from cylindrical grid specimen testing were compared with analytical prediction using the new analysis. The new analysis predicted stiffness coefficients with nearly 7% error compared to FEA results. From the parametric studies conducted, it was observed that the previous state-of-the-art analysis on the other hand exhibited errors of the order of 39% for certain designs. Stability evaluations were also conducted by integrating the new analysis with established stability formulations. A design study was conducted to evaluate the potential weight savings of a simple grid-stiffened rotor blade spar structure compared to a baseline monocoque design. Various design constraints such as stiffness, strength, and stability were imposed. A manual search was conducted for design parameters such as stiffener density, stiffener angle, shell laminate, and stiffener aspect ratio that provide lightweight grid-stiffened designs compared to the baseline. It was found that a weight saving of 9.1% compared to the baseline is possible without violating any of the design constraints.

Narayanan Nampy, Sreenivas

65

Ultra-heavy vertical lift system: The Heli-Stat. [helicopter - airship combination for materials handling  

NASA Technical Reports Server (NTRS)

A hybrid VTOL airship which is combined with helicopters is evaluated. The static lift of the airship supports approximately the full empty weight of the entire assembly. The helicopter rotors furnish the lift to support the payload as well as the propulsion and control about all axes. Thus existing helicopters, with no new technology required, can be made to lift payloads of ten times the capacity of each one alone, and considerably more than that of any airship built so far. A vehicle is described which has a 75-ton payload, based on four existing CH-53D helicopters and an airship of 3,600,000 cu. ft. The method of interconnection is described along with discussion of control, instrumentation, drive system and critical design conditions. The vertical lift and positioning capabilities of this vehicle far exceed any other means available today, yet can be built with a minimum of risk, development cost and time.

Piasecki, F. N.

1975-01-01

66

Lift truck safety review  

SciTech Connect

This report presents safety information about powered industrial trucks. The basic lift truck, the counterbalanced sit down rider truck, is the primary focus of the report. Lift truck engineering is briefly described, then a hazard analysis is performed on the lift truck. Case histories and accident statistics are also given. Rules and regulations about lift trucks, such as the US Occupational Safety an Health Administration laws and the Underwriter`s Laboratories standards, are discussed. Safety issues with lift trucks are reviewed, and lift truck safety and reliability are discussed. Some quantitative reliability values are given.

Cadwallader, L.C.

1997-03-01

67

SPUTUM CYTOLOGY IN OCCUPATIONAL EXPOSURE TO HEAVY METALS - A PRELIMINARY STUDY  

Microsoft Academic Search

Our study aimed the early detection of respiratory injuries afflicted with occupational exposure to chromium, cadmium, nickel and their compounds, with a known high carcinogenic risk. 23 platers (average of exposure 15.57±5.05 years) and matched controls have been investigated by clinical examination (including otolaryngology exam) completed by sputum cytology and an individual questionnaire. Heavy metals concentration, as well as the

Irina Anca Popescu; Doina Popa; Irina Alexandrescu

68

Performance and Design Investigation of Heavy Lift Tiltrotor with Aerodynamic Interference Effects  

NASA Technical Reports Server (NTRS)

The aerodynamic interference effects on tiltrotor performance in cruise are investigated using comprehensive calculations, to better understand the physics and to quantify the effects on the aircraft design. Performance calculations were conducted for 146,600-lb conventional and quad tiltrotors, which are to cruise at 300 knots at 4000 ft/95 deg F condition. A parametric study was conducted to understand the effects of design parameters on the performance of the aircraft. Aerodynamic interference improves the aircraft lift-to-drag ratio of the baseline conventional tiltrotor. However, interference degrades the aircraft performance of the baseline quad tiltrotor, due mostly to the unfavorable effects from the front wing to the rear wing. A reduction of rotor tip speed increased the aircraft lift-to-drag ratio the most among the design parameters investigated.

Yeo, Yyeonsoo; Johnson, Wayne

2007-01-01

69

The use of buoyancy to lift heavy objects from the sea  

Microsoft Academic Search

To recover oil from economically marginal offshore fields the re-use of production platforms has been considered. Re-use involves severing the jacket from the seabed, rotating the jacket to the horizontal and lifting it through the air\\/sea interface in a configuration suitable for towing. Five systems are considered for use in the recovery process. Two systems currently used for installation are

R. P. Fiske

1981-01-01

70

Advanced transportation system studies technical area 2(TA-2): Heavy lift launch vehicle development. volume 1; Executive summary  

NASA Technical Reports Server (NTRS)

The purpose of the TA-2 contract was to provide advanced launch vehicle concept definition and analysis to assist NASA in the identification of future launch vehicle requirements. Contracted analysis activities included vehicle sizing and performance analysis, subsystem concept definition, propulsion subsystem definition (foreign and domestic), ground operations and facilities analysis, and life cycle cost estimation. This document is part of the final report for the TA-2 contract. The final report consists of three volumes: Volume 1 is the Executive Summary, Volume 2 is Technical Results, and Volume 3 is Program Cost Estimates. The document-at-hand, Volume 1, provides a summary description of the technical activities that were performed over the entire contract duration, covering three distinct launch vehicle definition activities: heavy-lift (300,000 pounds injected mass to low Earth orbit) launch vehicles for the First Lunar Outpost (FLO), medium-lift (50,000-80,000 pounds injected mass to low Earth orbit) launch vehicles, and single-stage-to-orbit (SSTO) launch vehicles (25,000 pounds injected mass to a Space Station orbit).

McCurry, J.

1995-01-01

71

[Occupational neurotoxicology due to heavy metals-especially manganese poisoning].  

PubMed

The most hazardous manganese exposures occur in mining and smelting of ore. Recently, the poisoning has been frequently reported to be associated with welding. In occupational exposure, manganese is absorbed mainly by inhalation. Manganese preferentially accumulates in tissues rich in mitochondria. It also penetrates the blood brain barrior and accumulate in the basal ganglia, especially the globus pallidus, but also the striatum. Manganese poisoning is clinically characterized by the central nervous system involvement including psychiatric symptomes, extrapyramidal signs, and less frequently other neurological manifestations, Psychiatric symptomes are well described in the manganese miners and incrude sleep disturbance, disorientation, emotional lability, compulsive acts, hallucinations, illusions, and delusions. The main characteristic manifestations usually begin shortly after the appearance of these psychiatric symptomes. The latter neurological signs are progressive bradykinesia, dystonia, and disturbance of gait. Bradykinesia is one of the most important findings. There is a remarkable slowing of both active and passive movements of the extremities. Micrographia is frequently observed and a characteristic finding. The patients may show some symmetrical tremor, which usually not so marked. The dystonic posture of the limbs is often accompanied by painfull cramps. This attitudal hypertonia has a tenndency to decrease or disappear in the supine position and to increase in orthostation. Cog-wheel rigidity is also elisited on the passive movement of all extremities. Gait disturbance is also characteristic in this poisoning. In the severe cases, cook gait has been reported. The patient uses small steps, but has a tendency to elevate the heels and to rotate them outward. He progress without pressing on the flat of his feet, but only upon the metatarsophalangeal articulations, mainly of the fourth and fifth toes. Increased signal in T1-weighted image in the basal ganglia has been reported in patients with the poisoning. Thus, increasd signal intensities as a target site dose can be a more useful biomakers of the manganese than other biological indicies such as ambient manganese concentration or blood manganese concentration on individual basis. Manganese poisoning ultimately becomes chronic. However, if the disease is diagnosed while still at the early stages and the patient is removed from exposure, the course may be reversed. Once well established, it becomes progressive and irreversible, even when exposure is terminated. Levodopa therapy is not effective for the management of manganese poisoning. Levodopa unresponsiveness may be usefull to distinguish manganese-induced parkinsonism from Parkinson disease. PMID:17585589

Inoue, Naohide

2007-06-01

72

The use of buoyancy to lift heavy objects from the sea  

NASA Astrophysics Data System (ADS)

To recover oil from economically marginal offshore fields the re-use of production platforms has been considered. Re-use involves severing the jacket from the seabed, rotating the jacket to the horizontal and lifting it through the air/sea interface in a configuration suitable for towing. Five systems are considered for use in the recovery process. Two systems currently used for installation are found suitable for modification to recover jackets. They are the pontoon barge system and the self-floating tower. Major problems to be overcome in modifying for retraction are mating of the pontoon barge with the tower, developing a pile system which can be refurbished, and ensuring transverse stability on retraction through the air/sea interface.

Fiske, R. P.

1981-06-01

73

Aeroelastic effects in multi-rotor vehicles with application to a hybrid heavy lift system. Part 1: Formulation of equations of motion  

NASA Technical Reports Server (NTRS)

This report presents a set of governing coupled differential equations for a model of a hybrid aircraft. The model consists of multiple rotor systems connected by an elastic interconnecting structure, with options to add any combination of or all of the following components; i.e., thrusters, a buoyant hull, and an underslung weight. The dynamic equations are written for the individual blade with hub motions, for the rigid body motions of the whole model, and also for the flexible modes of the interconnecting structure. One of the purposes of this study is to serve as the basis of a numerical study aimed at determining the aeroelastic stability and structural response characteristics of a Hybrid Heavy Lift Airship (HHLA). It is also expected that the formulation may be applicable to analyzing stability and responses of dual rotor helicopters such as a Heavy Lift Helicopter (HLH). Futhermore, the model is capable of representing coupled rotor/body aeromechanical problems of single rotor helicopters.

Venkatesan, C.; Friedman, P.

1984-01-01

74

Advanced Transportation System Studies Technical Area 2 (TA-2) Heavy Lift Launch Vehicle Development Contract. Volume 2; Technical Results  

NASA Technical Reports Server (NTRS)

The purpose of the Advanced Transportation System Studies (ATSS) Technical Area 2 (TA-2) Heavy Lift Launch Vehicle Development contract was to provide advanced launch vehicle concept definition and analysis to assist NASA in the identification of future launch vehicle requirements. Contracted analysis activities included vehicle sizing and performance analysis, subsystem concept definition, propulsion subsystem definition (foreign and domestic), ground operations and facilities analysis, and life cycle cost estimation. This document is Volume 2 of the final report for the contract. It provides documentation of selected technical results from various TA-2 analysis activities, including a detailed narrative description of the SSTO concept assessment results, a user's guide for the associated SSTO sizing tools, an SSTO turnaround assessment report, an executive summary of the ground operations assessments performed during the first year of the contract, a configuration-independent vehicle health management system requirements report, a copy of all major TA-2 contract presentations, a copy of the FLO launch vehicle final report, and references to Pratt & Whitney's TA-2 sponsored final reports regarding the identification of Russian main propulsion technologies.

1995-01-01

75

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

NASA Technical Reports Server (NTRS)

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

1992-01-01

76

A statewide case registry for surveillance of occupational heavy metals absorption.  

PubMed Central

The New York State Heavy Metals Registry is a legislatively mandated program through which clinical laboratories, physicians, and health facilities report state residents 18 years of age and older with elevated levels of lead, mercury, arsenic, or cadmium in blood or urine. From 1982-86, the current employer was determined for 95.9 percent of 3,309 cases. Occupational exposures in 328 companies accounted for 82.8 percent of cases. The majority of companies were reported for lead (247 companies, 75.3 percent of total) or mercury (47 companies, 14.3 percent of total). Of the 247 companies reported to the Registry for lead, the Occupational Safety and Health Administration (OSHA) inspected 18 of 98 companies (18.4 percent) in the manufacturing sector, but only one of 149 companies (0.6 percent) outside the manufacturing sector. We conclude that the Registry effectively detects companies with heavy metals exposures, and is an especially useful adjunct to OSHA inspections outside the manufacturing sector. PMID:2297058

Baser, M E; Marion, D

1990-01-01

77

Occupational Exposure to Mineral Turpentine and Heavy Fuels: A Possible Risk Factor for Alzheimer's Disease  

PubMed Central

Background The association between solvents and Alzheimer's disease (AD) has been the subject of several studies. Yet, only few studies have examined the various solvents separately, and the controls have rarely been monitored long enough. For these reasons and others, we believe that further studies are required. Objectives The objective of this study was to identify solvents associated with the clinicoradiological diagnostic of AD or mixed-type dementia (MD). Methods A retrospective case-control study was performed in 156 patients followed up at the Memory Diagnostic Center of Bertinot Juel Hospital (France). The inclusion criteria were known occupation(s), a Mini-Mental State Examination (MMSE) score ?10 at the first visit, a neuropsychological evaluation performed and a diagnosis established in our Memory Diagnostic Center. The diagnostics were crossed with 9 solvents belonging to two classes of solvents. Exposure was evaluated using French national job-exposure matrices. Results Certain petroleum-based solvents and fuels (i.e. mineral turpentine, diesel fuel, fuel oil and kerosene) were associated with a diagnosis of AD or MD. This association was still significant after adjustment for age, sex and education (adjusted OR: 6.5; 95% CI: 2-20). Conclusion Occupational exposure to mineral turpentine and heavy fuels may be a risk factor for AD and MD. PMID:25028582

Helou, Rafik; Jaecker, Pierre

2014-01-01

78

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

Microsoft Academic Search

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

André Klussmann; Hansjürgen Gebhardt; Matthias Nübling; Falk Liebers; Emilio Quirós Perea; Wolfgang Cordier; Lars V von Engelhardt; Markus Schubert; Andreas Dávid; Bertil Bouillon; Monika A Rieger

2010-01-01

79

[Influence of tobacco smoking on amylase activity in serum persons occupational exposed to heavy metals].  

PubMed

The newest conducted investigations showed the significant role of tobacco smoking in inducing pathological changes in pancreas. Additionally exposure to heavy metals presents on polluted environment influences on function this organ. However, the mechanism of development of these changes has not been fully recognised. The aim of this study is to prove the influence of tobacco smoking on total amylase and termolabile amylase activity in serum of smoking and nonsmoking healthy persons and workers at cooper foundry in Legnica occupationally exposed to heavy metals: cadmium, arsenic, lead. Blood has been collected from 28 healthy persons and 60 founders. The enzyme total activity has been determined using the colorimetric method with substrate 1,2-odilauryl-rac-glycero-3-glutaric acid-(6-methylresorufin) ester. The thermolability activity has been determined using the thermolability test. It has been noted significant higher total amylase and thermolabile amylase activity in serum of smoking healthy persons (p < 0.0002; p < 0.002) and of non-smoking (p < 0.001; p < 0.01) and smoking founders (p < 0.0004; p < 0.001) comparison with non-smoking healthy persons. It hasn't been found significant differences in total and thermolabile amylase activity in smoking founders and non-smoking founders. The fact that there are significant differences in serum amylase activity in serum of smoking and nonsmoking founders in comparison with nonsmoking healthy persons prove a significant influence of exposure to heavy metals on exocrine function of pancreas. PMID:19189531

Sliwi?ska-Mosso?, Mariola; Milnerowicz, Halina; Zuchniewicz, Agnieszka; Andrzejak, Ryszard; Antonowicz-Juchniewicz, Jolanta

2008-01-01

80

Tornado lift  

E-print Network

It is shown that one of the causes for tornado is Tornado Lift. At increasing vortex diameter its kinetic energy decreases to keep the moment of momentum constant. A kinetic energy gradient of such vortex is Tornado Lift. Evaluation shows that contribution of Tornado Lift in air lifting in a tornado is comparable to buoyancy according to the order of magnitude.

Alexander Ivanchin

2010-02-06

81

Tornado lift  

E-print Network

It is shown that one of the causes for tornado is Tornado Lift. At increasing vortex diameter its kinetic energy decreases to keep the moment of momentum constant. A kinetic energy gradient of such vortex is Tornado Lift. Evaluation shows that contribution of Tornado Lift in air lifting in a tornado is comparable to buoyancy according to the order of magnitude.

Ivanchin, Alexander

2010-01-01

82

Satellite Power Systems (SPS) concept definition study. Volume 5: Transportation and operations analysis. [heavy lift launch and orbit transfer vehicles for orbital assembly  

NASA Technical Reports Server (NTRS)

The development of transportation systems to support the operations required for the orbital assembly of a 5-gigawatt satellite is discussed as well as the construction of a ground receiving antenna (rectenna). Topics covered include heavy lift launch vehicle configurations for Earth-to LEO transport; the use of chemical, nuclear, and electric orbit transfer vehicles for LEO to GEO operations; personnel transport systems; ground operations; end-to-end analysis of the construction, operation, and maintenance of the satellite and rectenna; propellant production and storage; and payload packaging.

Hanley, G.

1978-01-01

83

Eyelid lift  

MedlinePLUS

... lift to improve their appearance. This is called cosmetic or elective surgery. The eyelid lift may be done alone or ... Codere F, Tucker N. Cosmetic blepharoplasty and browplasty. In: ... Skin. 2nd ed . Philadelphia, PA: Elsevier Mosby; 2010:chap 39.

84

Solar power satellites and the ionosphere - The effect of high power microwave beams on the ionosphere and the chemical effects due to Heavy-Lift Launch Vehicles  

NASA Astrophysics Data System (ADS)

The effects of solar power satellites on the ionosphere are discussed, separated into two categories: (1) passive interactions, in which the ionospheric plasma influences the propagation of the power satellite beam in some way, and in some instances possibly gives rise to co-channel interference through scattering off the beam, and (2) an active inteference, in which ionospheric plasma itself is modified. Strong electron heating from the power satellite beam may produce irregularities in the ionization capable of scattering radio waves of lower frequencies, thereby increasing the potential for broad-band interference. Ionospheric modification may also result from the emission of exhaust effluents from heavy lift launch vehicles, and associated changes in ionospheric chemistry can lead to depletions in ionization at F-region heights. Interference with radio services is briefly discussed.

85

Large Spun Formed Friction-Stir Welded Tank Domes for Liquid Propellant Tanks Made from AA2195: A Technology Demonstration for the Next Generation of Heavy Lift Launchers  

NASA Technical Reports Server (NTRS)

Improving structural efficiency while reducing manufacturing costs are key objectives when making future heavy-lift launchers more performing and cost efficient. The main enabling technologies are the application of advanced high performance materials as well as cost effective manufacture processes. This paper presents the status and main results of a joint industrial research & development effort to demonstrate TRL 6 of a novel manufacturing process for large liquid propellant tanks for launcher applications. Using high strength aluminium-lithium alloy combined with the spin forming manufacturing technique, this development aims at thinner wall thickness and weight savings up to 25% as well as a significant reduction in manufacturing effort. In this program, the concave spin forming process is used to manufacture tank domes from a single flat plate. Applied to aluminium alloy, this process allows reaching the highest possible material strength status T8, eliminating numerous welding steps which are typically necessary to assemble tank domes from 3D-curved panels. To minimize raw material costs for large diameter tank domes for launchers, the dome blank has been composed from standard plates welded together prior to spin forming by friction stir welding. After welding, the dome blank is contoured in order to meet the required wall thickness distribution. For achieving a material state of T8, also in the welding seams, the applied spin forming process allows the required cold stretching of the 3D-curved dome, with a subsequent ageing in a furnace. This combined manufacturing process has been demonstrated up to TRL 6 for tank domes with a 5.4 m diameter. In this paper, the manufacturing process as well as test results are presented. Plans are shown how this process could be applied to future heavy-lift launch vehicles developments, also for larger dome diameters.

Stachulla, M.; Pernpeinter, R.; Brewster J.; Curreri, P.; Hoffman, E.

2010-01-01

86

Forehead lift  

MedlinePLUS

... In most people, the cut for the forehead lift is under the hairline. If you have a high or receding hairline , you may be able to ... can form. Permanent hair loss after a forehead lift is rare. Medical ... to form excessive scars Uncontrolled high blood pressure

87

New Capabilities to Achieve Future Major Astrophysical Goals in Space: In-Space Servicing and the Ares V Heavy Lift Launch Vehicle  

NASA Astrophysics Data System (ADS)

The astronomy community, NASA Centers, and the National Academy of Sciences are beginning the processes to design, assess, and advocate a generation of very large, very capable astronomical observatories for the post-JWST time period; that is, about 2020 and beyond. Simultaneously, commercial companies and entrepreneurs, as well as NASA's human spaceflight program, are investing in capabilities that may be adapted - and, indeed, may be necessary - to enable the most ambitious science missions in space. In this presentation, we describe the history of and recent progress in space robotics, notably DARPA's Orbital Express program, which demonstrated in Spring, 2007 effective in-space acquisition, rendezvous, docking, and instrument transfer. We also will summarize recent concepts for modest augmentation of the Orion/Crew Exploration Vehicle that would permit astronaut and/or robotic servicing of the science community's most valuable space assets. Finally, we will outline our proposed study of the Ares V heavy lift launch vehicle, which has the potential to put a 8 m monolithic telescope - or even larger segmented/deployable optic - into the Sun-Earth L2 orbit.

Thronson, Harley A., Jr.; Postman, M.; Stahl, P.; Lester, D.; Lillie, C.; Moe, R.; Schweitzer, A.; Varsi, G.; Espero, T.

2007-12-01

88

49 CFR 37.165 - Lift and securement use.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Lift and securement use. 37.165 Section... Provision of Service § 37.165 Lift and securement use. (a) This section...carry the wheelchair and occupant if the lift and vehicle can accommodate the...

2012-10-01

89

Sinus Lift  

MedlinePLUS

... antibiotic and an antimicrobial mouthwash to help prevent infection. Most patients have only a little discomfort after a sinus-lift procedure. You will see the specialist after 7 to 10 days. He or she will evaluate the surgical site and remove stitches if they will not dissolve ...

90

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

91

Effect of different multipliers and their interactions during manual lifting operations  

Microsoft Academic Search

The National Institute for Occupational Safety and Health (NIOSH) developed a lifting equation in 1981 to indicate “safe” occupational lifting limits. This equation was revised in 1991. The equation uses a series of lifting multipliers (parameters) to calculate corresponding recommended task weight limits. Due to the nature of risk factor interactions, the limits obtained from the NIOSH equation may not

Rina Maiti; Tapan P. Bagchi

2006-01-01

92

Job characteristics of occupations and myocardial infarction risk:effect of possible confounding factors.  

PubMed

In this paper some previously found associations between psychosocial occupational characteristics and myocardial infarction (MI) risk are scrutinized regarding confounding effects. Standardized occupational characteristics were obtained for 118 occupational groups by means of a nation wide interview survey (3876 men). Possible confounding factors available were smoking, low level of education, high proportion of immigrants (mainly of Finnish origin) and heavy lifting. The standardized characteristics were utilized in a case-control study of 1216 men 40-64 years of age, living in the Stockholm County. It was concluded that occupations characterized by both high demand and at the same time small possibility of control or growth ('strain') are associated with an elevated MI risk regardless of the confounding factors. Taking each of the confounding factors into account the risk of developing MI for men aged 40-54 years employed in these strenuous occupations is about twice as high as for those employed in other occupations. PMID:6635714

Alfredsson, L; Theorell, T

1983-01-01

93

A LIFT SIMULATION A LIFT SIMULATION PROTOTYPE  

E-print Network

A LIFT SIMULATION A LIFT SIMULATION PROTOTYPE V C Galpin & S T Rock Computer Science Department University of the Witwatersrand, Johannesburg Wits 2050 South Africa #12;A LIFT SIMULATION 1 SUMMARY We present a simple simulation of lift (or elevator) operation that has been developed as a prototype

Galpin, Vashti

94

Power assist for lifting motion in sagittal plane by forearm support-type lift assist system (FOLAS)  

Microsoft Academic Search

Lifting a heavy object is regarded as a frequently performed motion that imposes physical strains on workers. The objective of this study is to verify the effectiveness of forearm support-type lift assist system (FOLAS) for lifting motion in the sagittal plane. The mechanical structure of the FOLAS is largely divided into a forearm support and a parallel motion arm; the

Suwoong Lee; Hidetaka Nozawa; Daisuke Watanabe; Jae-Il Kim; Kenji Inoue

2011-01-01

95

A shadowgraph study of the National Launch System's 1 1/2 stage vehicle configuration and Heavy Lift Launch Vehicle configuration. [Using the Marshall Space Flight Center's 14-Inch Trisonic Wind Tunnel  

NASA Technical Reports Server (NTRS)

A shadowgraph study of the National Launch System's (NLS's) 1 1/2 stage and heavy lift launch vehicle (HLLV) configurations is presented. Shadowgraphs are shown for the range of Mach numbers from Mach 0.6 to 5.0 at various angles-of-attack and roll angles. Since the 1 1/2 stage configuration is generally symmetric, no shadowgraphs of any roll angle are shown for this configuration. The major flow field phenomena over the NLS 1 1/2 stage and HLLV configurations are shown in the shadowgraphs. These shadowgraphs are used in the aerothermodynamic analysis of the external flow conditions the launch vehicle would encounter during the ascent stage of flight. The shadowgraphs presented in this study were obtained from configurations tested in the Marshall Space Flight Center's 14-Inch Trisonic Wind Tunnel during 1992.

Pokora, Darlene C.; Springer, Anthony M.

1994-01-01

96

Occupational Therapy Occupational Therapy  

E-print Network

Occupational Therapy Occupational Therapy When you work as an Occupational Therapist, you use and possibilities are endless! Program The UWM OT program has a rich history in Occupational Therapy education Therapy Association (AOTA). U.S. News and World Report has ranked the UWM Occupational Therapy Graduate

Saldin, Dilano

97

Safety First Safety Last Safety Always Aerial lifts include the following types of vehicle-mounted  

E-print Network

lifts Link: Occupational Safety and Health Administration www.osha.gov #12;Safety First Safety Last Safety Always Aerial lifts include the following types of vehicle, if they can be installed safely. Aerial Lifts Safety Tip #11 A spill, a slip, a hospital trip #12;Additional

Minnesota, University of

98

Revised NIOSH equation for the design and evaluation of manual lifting tasks  

Microsoft Academic Search

In 1985, the National Institute for Occupational Safety and Health (NIOSH) convened an ad hoc committee of experts who reviewed the current literature on lifting, recommend criteria for defining lifting capacity, and in 1991 developed a revised lifting equation. Subsequently, NIOSH developed the documentation for the equation and played a prominent role in recommending methods for interpreting the results of

THOMAS R. WATERS; VERN PUTZ-ANDERSON; ARUN GARG; LAWRENCE J. FINE

1993-01-01

99

Lower-body lift.  

PubMed

The lower-body lift, designed for patients with multiple lower-body contour deformities, uses a circumferential bikini-line incision to simultaneously lift relaxed trunk and thigh tissues. The author describes 2 lower-body lift procedures, focusing primarily on the high-lateral-tension abdominoplasty with transverse-thigh/buttock lift, which he developed in 1996. (Aesthetic Surg J 2001;21:355-370.). PMID:19331916

Lockwood, T E

2001-07-01

100

Numerical simulation of the 16-19 October 1994 southeast Texas heavy rain event: precipitation results and diagnosis of the lifting mechanism  

E-print Network

in producing not only the correct rainfall magnitudes during deep convective events, but also the timing, placement, and evolution of convection (Zhang and Fritsch 1986b; Zhang et al. 1988; Zhang et al. 1989). However, this predictive skill has been... initial conditions were modified during a time-intensive subjective process. Zhang and Fritsch (1986b) successfully simulated the size, propagation rate, and orientation of a squall line and mesoscale convective complex that produced heavy rainfall...

Petroski, Thomas John

2012-06-07

101

High lift selected concepts  

NASA Technical Reports Server (NTRS)

The benefits to high lift system maximum life and, alternatively, to high lift system complexity, of applying analytic design and analysis techniques to the design of high lift sections for flight conditions were determined and two high lift sections were designed to flight conditions. The influence of the high lift section on the sizing and economics of a specific energy efficient transport (EET) was clarified using a computerized sizing technique and an existing advanced airplane design data base. The impact of the best design resulting from the design applications studies on EET sizing and economics were evaluated. Flap technology trade studies, climb and descent studies, and augmented stability studies are included along with a description of the baseline high lift system geometry, a calculation of lift and pitching moment when separation is present, and an inverse boundary layer technique for pressure distribution synthesis and optimization.

Henderson, M. L.

1979-01-01

102

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. PMID:22232503

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

2010-01-01

103

Pig lift: A new artifical lift method  

SciTech Connect

Artificial lift of oil wells is a fairly broad subject. There are many different methods available but in a few cases none of them turns out to be a fit option. Some specific situation such as high viscosity or waxy oil, high gas-to-liquid ratio (GLR), horizontal and/or very deep well generate artificial lift problems that causes high reservoir back pressure, and, consequently, low production rates. Pig lift is a new novel artificial lift method developed to solve some of these problems. It uses a U-shaped double completion string in the wellbore, with a full bore bottom hole connector, and a surface piping and control system. This physical arrangement is put together to allow the cyclic and automated launching of a low density foam pig from the surface, pushing along with it the liquid phase accumulated into the tubing string. The method is, therefore, cyclic. High pressure gas is used to displace the pig. The system was successfully installed in five wells in Brazil, increasing the production flow rate significantly, as compared to conventional artificial lift methods. This paper presents the description of the pig lift method, and reports the results obtained in these field trials. Discussions of its technical and economical advantages and potential areas of application is also given.

Lima, P.C.R.

1996-12-31

104

Control of Separation on the Flap of a Three-Element High-Lift Configuration  

E-print Network

Control of Separation on the Flap of a Three-Element High-Lift Configuration B. G¨unther and Frank of the control of the flow over the flap of a three-element high-lift configuration by means of periodic of incorporating complex, heavy and expensive multi-element high lift devices, single flaps without slats

Andrzejak, Artur

105

Lifting BLS Power Supplies  

SciTech Connect

This note describes BLS power supplies lifting techniques and provides stress calculations for lifting plate and handles bolts. BLS power supply weight is about 120 Lbs, with the center of gravity shifted toward the right front side. A lifting plate is used to attach a power supply to a crane or a hoist. Stress calculations show that safety factors for lifting plate are 12.9 (vs. 5 required) for ultimate stress and 5.7 (vs. 3 required) for yield stress. Safety factor for shackle bolt thread shear load is 37, and safety factor for bolts that attach handles is 12.8.

Sarychev, Michael

2007-08-01

106

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

107

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

108

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

109

High lift aerodynamics  

NASA Technical Reports Server (NTRS)

The current program is aimed at providing a physical picture of the flow physics and quantitative turbulence data of the interaction of a high Reynolds number wake with a flap element. The impact of high lift on aircraft performance is studied for a 150 passenger transport aircraft with the goal of designing optimum high lift systems with minimum complexity.

Sullivan, John; Schneider, Steve; Campbell, Bryan; Bucci, Greg; Boone, Rod; Torgerson, Shad; Erausquin, Rick; Knauer, Chad

1994-01-01

110

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

111

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

112

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

113

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

114

Monthly Theme Safe Lifting February 2009 SAFE LIFTING  

E-print Network

Monthly Theme ­ Safe Lifting ­ February 2009 SAFE LIFTING Four out of five people will have some experienced both on and off the job. Lifting is one of these activities that can result in serious injury if not done properly. To prevent injury, you must learn correct lifting techniques and use them all the time

Calgary, University of

115

29 CFR 1915.114 - Chain falls and pull-lifts.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF LABOR (CONTINUED) OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT Gear and Equipment for Rigging and Materials Handling § 1915.114 Chain falls and pull-lifts. The provisions of this section shall apply to...

2011-07-01

116

29 CFR 1915.114 - Chain falls and pull-lifts.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF LABOR (CONTINUED) OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT Gear and Equipment for Rigging and Materials Handling § 1915.114 Chain falls and pull-lifts. The provisions of this section shall apply to...

2013-07-01

117

29 CFR 1915.114 - Chain falls and pull-lifts.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF LABOR (CONTINUED) OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT Gear and Equipment for Rigging and Materials Handling § 1915.114 Chain falls and pull-lifts. The provisions of this section shall apply to...

2012-07-01

118

29 CFR 1915.114 - Chain falls and pull-lifts.  

...DEPARTMENT OF LABOR (CONTINUED) OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT Gear and Equipment for Rigging and Materials Handling § 1915.114 Chain falls and pull-lifts. The provisions of this section shall apply to...

2014-07-01

119

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

120

Handicapped car lifting seat  

E-print Network

Currently there is a lack of assistance in automobile usage for the older people of our society. In an attempt to combat this problem, this thesis designs and builds a working conceptual model of a handicapped car lifting ...

Schoenmakers, Sean A

2005-01-01

121

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

122

High-Rate Artificial Lift  

Microsoft Academic Search

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.

Joe Clegg

1988-01-01

123

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

124

Product Sheet Wall Mount Lift  

E-print Network

Product Sheet Wall Mount Lift Ergotron® Neo-FlexTM 870-05-061, rev. 12/11/07 www-Flex Wall Mount Lift! CF patented lift-and-pivot motion technology adjusts with a light touch. Raise-Flex Wall Mount Lift Commercial Part Number: 60-577-195 (black) Options: Works with a variety of Ergotron

Saskatchewan, University of

125

Occupational activity and osteoarthritis of the knee.  

PubMed Central

OBJECTIVES--To test the hypothesis that specific occupational physical activities are risk factors for knee osteoarthritis (OA). METHODS--A population-based case-control study of knee osteoarthritis was carried out in which 109 men and women with painful, radiographically confirmed knee OA were compared with 218 age and sex matched controls who had not suffered knee pain and had normal radiographs. Information collected included a lifetime occupational history and details of specific workplace physical activities. RESULTS--After adjustment for obesity and Heberden's nodes, the risk of knee OA was significantly elevated in subjects whose main job entailed more than 30 minutes per day squatting (OR 6.9, 95% CI 1.8-26.4) or kneeling (OR 3.4, 95% CI 1.3-9.1), or climbing more than ten flights of stairs per day (OR 2.7, 95% CI 1.2-6.1). The increase in risk associated with kneeling or squatting appeared to be more marked in subjects whose jobs entailed heavy lifting, but the size of the study did not permit precise delineation of any such interaction. CONCLUSIONS--These data suggest that prolonged or repeated knee bending is a risk factor for knee OA, and that risk may be higher in jobs which entail both knee bending and mechanical loading. PMID:8129467

Cooper, C; McAlindon, T; Coggon, D; Egger, P; Dieppe, P

1994-01-01

126

Affordable Heavy Lift Capability: 2000-2004  

NASA Technical Reports Server (NTRS)

This custom bibliography from the NASA Scientific and Technical Information Program lists a sampling of records found in the NASA Aeronautics and Space Database. The scope of this topic includes technologies to allow robust, affordable access of cargo, particularly to low-Earth orbit. This area of focus is one of the enabling technologies as defined by NASA s Report of the President s Commission on Implementation of United States Space Exploration Policy, published in June 2004.

2004-01-01

127

Ares V: Progress Toward Unprecedented Heavy Lift  

NASA Technical Reports Server (NTRS)

Ares V represents the vehicle that will again make possible human exploration beyond low Earth orbit. The Ares V is part of NASA s Constellation Program architecture developed to support the International Space Station (ISS), establish a permanent human presence on the Moon, and explore it to an extent far greater than was possible with the Apollo Program. Ares V will carry the lunar lander to orbit where it will join the Orion crew spacecraft, launched by the smaller Ares I launch vehicle. Then the Ares V upper stage will send the Orion and lander to the Moon. Ares V is also intended to launch automated cargo landers to the Moon. The Ares vehicles are designed to employ the proven technologies and experience from the Space Shuttle, Delta IV, and earlier U.S. programs, as well as sharing common components where feasible. The Ares V is in an early stage of concept development. However, commonality allows it to benefit from development work already under way on the Ares I, including the first stage booster, and upper stage, J-2X upper stage engine. This paper will discuss progress to date on the Ares V and its potential for freeing payload designers from current mass and volume constraints. Progress includes development progress on Ares I elements that will be shared by the two launch vehicles. The Ares I first stage recently completed a successful test firing of Development Motor 1 (DM-1). The J-2X engine is proceeding with manufacturing of components for the first development engines that will be used for testing. Several component-level tests have been completed or are under way that will help verify designs and confirm solutions to design challenges. The Ares V Earth departure stage will benefit from the Ares I upper stage development, including design, manufacturing, and materials testing. NASA is also working with government and industry to collect data on flights and testing of the operational RS-68 engine and potential upgrades. The Ares V team continues to evaluate technical options, vehicle configurations, and operations concepts for the Ares V. The team recently completed a Fall Face-to-Face meeting that served as a stepping-stone to the Systems Requirements Review (SRR). This four-day meeting served as an information exchange for the various teams at several NASA field centers and supporting contractors.

Sumrall, Phil

2010-01-01

128

Subperiosteal midface-lift.  

PubMed

The subperiosteal midface-lift has benefited from significant technological advances in medicine. The endoscope now allows extensive subperiosteal undermining of facial soft tissue through minimal access incisions. Improved understanding of facial anatomy and the facial aging process now allow repositioning and remodeling of the soft tissue envelope with excellent aesthetic results. The subperiosteal midface-lift by a temporal approach is a procedure designed to rejuvenate the middle third of the face. After subperiosteal detachment, the soft tissues of the cheek, jowls, lateral canthus, and inferior orbital rim can be lifted to reestablish their youthful relationship with the underlying skeleton. It is a technique that produces satisfactory cosmetic results in most cases, causing malar augmentation, nasolabial fold improvement, and mild jowl improvement. We describe our preferred technique in detail and discuss its indications, complications, advantages, and limitations. PMID:23761124

Patrocinio, Lucas G; Patrocinio, Tomas G; Patrocinio, Jose A

2013-06-01

129

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

130

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

131

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

132

Musculoskeletal disorders and occupational exposures: how should we judge the evidence concerning the causal association?  

PubMed

Musculoskeletal disorders (MSDs) affecting the back, upper and lower extremities are widespread in the general population, implying a variety of causal factors. Multiple causes are not mutually exclusive, and a high background rate does not preclude associations with specific factors that are uncommon in the general population. MSDs have well-documented associations with occupational ergonomic stressors such as repetitive motion, heavy lifting, non-neutral postures, and vibration. Organizational features of the work environment, such as time pressure and low decision latitude, may also play a role, at least by potentiating the effects of physical loading. Numerous systematic reviews have mostly concurred with these overall findings. Nevertheless, some continue to debate whether MSDs are sometimes work-related, even for those performing jobs with repetitive and routinized tasks, heavy lifting, and/or pronounced postural strain. This article discusses (1) some epidemiologic features of MSDs that underlie that debate; and (2) the question of what should appropriately be considered a gold standard for scientific evidence on an etiological question such as the health effects of a non-voluntary exposure, such as an occupational or environmental agent. In particular, randomized clinical trials have little relevance for determining the health effects of non-therapeutic risk factors. PMID:24553854

Punnett, Laura

2014-03-01

133

Hydraulic lifting device  

NASA Technical Reports Server (NTRS)

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 present invention is best utilized for raising and lowering toilet seats.

Terrell, Kyle (inventor)

1990-01-01

134

JWST Lifting System  

NASA Technical Reports Server (NTRS)

A document describes designing, building, testing, and certifying a customized crane (Lifting Device LD) with a strong back (cradle) to facilitate the installation of long wall panels and short door panels for the GHe phase of the James Webb Space Telescope (JWST). The LD controls are variable-frequency drive controls designed to be adjustable for very slow and very-short-distance movements throughout the installation. The LD has a lift beam with an electric actuator attached at the end. The actuator attaches to a rectangular strong back (cradle) for lifting the long wall panels and short door panels from a lower angle into the vertical position inside the chamber, and then rotating around the chamber for installation onto the existing ceiling and floor. The LD rotates 360 (in very small increments) in both clockwise and counterclockwise directions. Eight lifting pads are on the top ring with 2-in. (.5-cm) eye holes spaced evenly around the ring to allow for the device to be suspended by three crane hoists from the top of the chamber. The LD is operated by remote controls that allow for a single, slow mode for booming the load in and out, with slow and very slow modes for rotating the load.

Tolleson, William

2012-01-01

135

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

136

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

137

High-order lifting  

Microsoft Academic Search

The well-known technique of adic-lifting for linear-system solution is studied. Some new methods are developed and applied to get algorithms for the following problems over the ring of univariate polynomials with coefficients from a field: rational system-solving, integrality certification and determinant\\/Smith-form computation. All algorithms are Las Vegas probabilistic.

Arne Storjohann

2002-01-01

138

High Lift Flight Tunnel  

NASA Technical Reports Server (NTRS)

Concept for new generation of wind tunnel, in which the model is moved thru the test medium, instead of the medium flowing over a static model. Offers potentially greater accuracy of test data. Intended to address the low-speed/ high lift arena.

1998-01-01

139

Lift and multiple equilibrium positions of a single particle in Newtonian and Oldroyd-B fluids  

Microsoft Academic Search

A heavy particle is lifted from the bottom of a channel in a plane Poiseuille flow when the Reynolds number is larger than a critical value. In this paper we obtain correlations for lift-off of particles in Oldroyd-B fluids. The fluid elasticity reduces the critical shear Reynolds number for lift-off. The effect of the gap size between the particle and

Taehwan Ko; Neelesh A. Patankar; Daniel D. Joseph

2006-01-01

140

Occupational Science & Occupational Therapy Master of Occupational Therapy  

E-print Network

Occupational Science & Occupational Therapy Master of Occupational Therapy 2012 - 2013 STUDENT HANDBOOK #12;2012-2013 MOT Student Handbook Master of Occupational Therapy Program Department of Occupational Science & Occupational Therapy University of British Columbia Page | 1 CONTENTS Part I

Handy, Todd C.

141

Helicopter Toy and Lift Estimation  

ERIC Educational Resources Information Center

A $1 plastic helicopter toy (called a Wacky Whirler) can be used to demonstrate lift. Students can make basic measurements of the toy, use reasonable assumptions and, with the lift formula, estimate the lift, and verify that it is sufficient to overcome the toy's weight. (Contains 1 figure.)

Shakerin, Said

2013-01-01

142

PLACE A CALL lift handset  

E-print Network

1 PLACE A CALL lift handset OR With Receiver on Hook press line key OR For Two-Way Handsfree Call press Handsfree key (selects line) ANSWER A CALL Call Status flashes on telephone set: lift handset (selects line) OR press flashing line key and lift handset OR press Handsfree key ( selects ringing line

Waterloo, University of

143

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

144

Occupational Asthma  

Microsoft Academic Search

Occupational asthma is the most common occupational lung disease. Work-aggravated asthma and occupational asthma are two forms\\u000a of asthma causally related to the workplace, while reactive airways dysfunction syndrome is a separate entity and a subtype\\u000a of occupational asthma. The diagnosis of occupational asthma is most often made on clinical grounds. The gold standard test,\\u000a specific inhalation challenge, is rarely

Nicholas J. Kenyon; Brian M. Morrissey; Michael Schivo; Timothy E. Albertson

145

Back lift versus leg lift: An index and visualization of dynamic lifting strategies  

Microsoft Academic Search

Abstract The description of a lifting strategy is typically provided in qualitative terms. A quantitative static descriptor or index differentiates the starting postures but not the primary moving,segments. This technical note proposes an index that quantitatively characterizes different dynamic ,postural strategies employed ,during sagittal plane lifting. Dynamic ,lifting strategies are modeled ,in the velocity domain ,as different schemes ,of partitioning

Xudong Zhang; Maury A. Nussbaum; Don B. Chaffin

146

Back lift versus leg lift: an index and visualization of dynamic lifting strategies  

Microsoft Academic Search

The description of a lifting strategy is typically provided in qualitative terms. A quantitative static descriptor or index differentiates the starting postures but not the primary moving segments. This technical note proposes an index that quantitatively characterizes different dynamic postural strategies employed during sagittal plane lifting. Dynamic lifting strategies are modeled in the velocity domain as different schemes of partitioning

Xudong Zhang; Maury A. Nussbaum; Don B. Chaffin

2000-01-01

147

Powered-lift aircraft technology  

NASA Technical Reports Server (NTRS)

Powered lift aircraft have the ability to vary the magnitude and direction of the force produced by the propulsion system so as to control the overall lift and streamwise force components of the aircraft, with the objective of enabling the aircraft to operate from minimum sized terminal sites. Power lift technology has contributed to the development of the jet lift Harrier and to the forth coming operational V-22 Tilt Rotor and the C-17 military transport. This technology will soon be expanded to include supersonic fighters with short takeoff and vertical landing capability, and will continue to be used for the development of short- and vertical-takeoff and landing transport. An overview of this field of aeronautical technology is provided for several types of powered lift aircraft. It focuses on the description of various powered lift concepts and their operational capability. Aspects of aerodynamics and flight controls pertinent to powered lift are also discussed.

Deckert, W. H.; Franklin, J. A.

1989-01-01

148

High lift wake investigation  

NASA Technical Reports Server (NTRS)

The behavior of wakes in adverse pressure gradients is critical to the performance of high-lift systems for transport aircraft. Wake deceleration is known to lead to sudden thickening and the onset of reversed flow; this 'wake bursting' phenomenon can occur while surface flows remain attached. Although known to be important for high-lift systems, few studies of such decelerated wakes exist. In this study, the wake of a flat plate has been subjected to an adverse pressure gradient in a two-dimensional diffuser, whose panels were forced to remain attached by use of slot blowing. Pitot probe surveys, L.D.V. measurements, and flow visualization have been used to investigate the physics of this decelerated wake, through the onset of reversed flow.

Sullivan, J. P.; Schneider, S. P.; Hoffenberg, R.

1996-01-01

149

Lifting Body Flight Vehicles  

NASA Technical Reports Server (NTRS)

NASA has a technology program in place to build the X-33 test vehicle and then the full sized Reusable Launch Vehicle, VentureStar. VentureStar is a Lifting Body (LB) flight vehicle which will carry our future payloads into orbit, and will do so at a much reduced cost. There were three design contenders for the new Reusable Launch Vehicle: a Winged Vehicle, a Vertical Lander, and the Lifting Body(LB). The LB design won the competition. A LB vehicle has no wings and derives its lift solely from the shape of its body, and has the unique advantages of superior volumetric efficiency, better aerodynamic efficiency at high angles-of-attack and hypersonic speeds, and reduced thermal protection system weight. Classically, in a ballistic vehicle, drag has been employed to control the level of deceleration in reentry. In the LB, lift enables the vehicle to decelerate at higher altitudes for the same velocity and defines the reentry corridor which includes a greater cross range. This paper outlines our LB heritage which was utilized in the design of the new Reusable Launch Vehicle, VentureStar. NASA and the U.S. Air Force have a rich heritage of LB vehicle design and flight experience. Eight LB's were built and over 225 LB test flights were conducted through 1975 in the initial LB Program. Three LB series were most significant in the advancement of today's LB technology: the M2-F; HL-1O; and X-24 series. The M2-F series was designed by NASA Ames Research Center, the HL-10 series by NASA Langley Research Center, and the X-24 series by the Air Force. LB vehicles are alive again today.

Barret, Chris

1998-01-01

150

Enhanced Rescue Lift Capability  

NASA Technical Reports Server (NTRS)

The evolving and ever-increasing demands of emergency response and disaster relief support provided by rotorcraft dictate, among other things, the development of enhanced rescue lift capability for these platforms. This preliminary analysis is first-order in nature but provides considerable insight into some of the challenges inherent in trying to effect rescue using a unique form of robotic rescue device deployed and operated from rotary-wing aerial platforms.

Young, Larry A.

2007-01-01

151

Catalytic Generation of Lift Gases for Balloons  

NASA Technical Reports Server (NTRS)

A lift-gas cracker (LGC) is an apparatus that generates a low-molecular-weight gas (mostly hydrogen with smaller amounts of carbon monoxide and/or carbon dioxide) at low gauge pressure by methanol reforming. LGCs are undergoing development for use as sources of buoyant gases for filling zero-gauge-pressure meteorological and scientific balloons in remote locations where heavy, high-pressure helium cylinders are not readily available. LGCs could also be used aboard large, zero-gauge-pressure, stratospheric research balloons to extend the duration of flight.

Zubrin, Robert; Berggren, Mark

2011-01-01

152

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

153

Dynamic Lifting by Whole Body Motion of Humanoid Robots Hitoshi Arisumi, Sylvain Miossec, Jean-Rmy Chardonnet, and Kazuhito Yokoi, Member, IEEE  

E-print Network

Dynamic Lifting by Whole Body Motion of Humanoid Robots Hitoshi Arisumi, Sylvain Miossec, Jean to a higher position with humanoid robots is developed. The key issue of lifting motion is how to reduce realize a motion of lifting a heavy object dynamically with the humanoid robot HRP-2 through experiment

Paris-Sud XI, Université de

154

Occupational Therapists  

MedlinePLUS

... Offices of physical, occupational and speech therapists, and audiologists 22 Elementary and secondary schools; state, local, and ... Offices of physical, occupational and speech therapists, and audiologists 77,430 Hospitals; state, local, and private 75, ...

155

Plunger lift comes of age  

SciTech Connect

In the never-ending search to cut production costs while maintaining output and maximizing profits, operators are giving plunger lift a closer look. This is particularly true for marginal wells that might otherwise be shut in. Plunger lift is a cost-efficient method of artificially lifting low-liquid-volume oil wells that increase their profits. Some wells would have to be shut in if they remained on beam lit, due to high costs. With the plunger lift system, they are profitable. Field studies show plunger lift to be a cost-efficient, low-maintenance method of sustaining or improving output from low-volume wells. Not all wells are good candidates, so proper evaluation is essential. This paper reviews the optimal well environment for plunger lifts, their design, and cost benefit analysis.

Christian, J. [Amoco E and P, Andrews, TX (United States); Lea, J.F. [Amoco E and PTG, Tulsa, OK (United States); Bishop, B. [Enterra Lift Systems, Midland, TX (United States)

1995-11-01

156

Occupational Employment  

ERIC Educational Resources Information Center

When choosing a career, jobseekers often want to know which occupations offer the best prospects. Generally, occupations that have rapid job growth, many new jobs, or many job openings--and good wages--promise better opportunities. This paper shows how employment in particular occupations is projected to change from 2010 to 2020. It presents…

Occupational Outlook Quarterly, 2012

2012-01-01

157

Occupational Employment  

ERIC Educational Resources Information Center

When choosing a career, jobseekers often want to know which occupations offer the best prospects. Generally, occupations that have rapid job growth, many new jobs, or many job openings--and good wages--promise better opportunities. This article shows how employment in particular occupations is projected to change over the 2008-2018 decade. The…

Occupational Outlook Quarterly, 2010

2010-01-01

158

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

159

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

160

Hoisting and Rigging: Lift Planning and Control for Ordinary Lifts  

E-print Network

rings, spreader beams, slings, etc 2. Show attachment points (how rigging gear will be attached to load such as a lifter or spreader beam 5. Show proper orientation of eyebolts 6. Indicate the center of gravityPlan # Hoisting and Rigging: Lift Planning and Control for Ordinary Lifts Department or Group Plan

Wechsler, Risa H.

161

Random Lifts of Graphs Nati Linial  

E-print Network

Random Lifts of Graphs Nati Linial 27th Brazilian Math Colloquium, July '09 Nati Linial Random Lifts of Graphs #12;Plan of this talk A brief introduction to the probabilistic method. A quick review of expander graphs and their spectrum. Lifts, random lifts and their properties. Spectra of random lifts. Nati

Linial, Nathan "Nati"

162

Effect of lifting belts on trunk muscle activation during a suddenly applied load.  

PubMed

The National Institute for Occupational Safety and Health suggests there is insufficient biomechanical or epidemiological evidence to recommend the use of back belts in industry. From a biomechanical perspective, previous work suggests that lifting belts stiffen the torso, particularly in the frontal and transverse planes. To determine whether lifting belts stiffen the torso and alter the trunk muscle response during a sudden loading event, we tested the hypotheses that (a) lifting belts alter peak muscle activity recorded with electromyography (EMG) during sudden loading and (b) lifting belts have a larger impact on trunk muscle response when sudden loads are applied asymmetric to the torso's midsagittal plane. A sudden load was delivered to 10 men and 10 women without history of low back disorder via a cable attached to a thoracic harness; motion was restricted to the lumbar spine. Results indicate that gender was not a significant factor in this study. The lifting belt reduced the peak normalized EMG of the erector spinae muscles on average by 3% during asymmetric loading, though peak normalized EMG was increased by 2% during symmetric loading. Lifting belts have been shown to slightly reduce peak erector spinae activity during asymmetric sudden loading events in a constrained paradigm; however, the effects of lifting belts are too small to provide effective protection of workers. Actual or potential applications include the assessment of lifting belts as protective devices in workers based on the effects of lifting belts on the trunk muscle activity. PMID:10774136

Thomas, J S; Lavender, S A; Corcos, D M; Andersson, G B

1999-12-01

163

Maximum isoinertial lifting capabilities for different lifting ranges and container dimensions  

Microsoft Academic Search

The aim of this study was to examine the effects of lifting range and container dimension on human maximum isoinertial lifting capability in the sagittal plane. Ten young and experienced lifters were tested for their maximum isoinertial lifting capabilities for 12 different lifting conditions (three lifting ranges × four container dimensions). The results showed that lifting range and container dimension

Tzu-Hsien Lee

2005-01-01

164

Pneumatic Spoiler Controls Airfoil Lift  

NASA Technical Reports Server (NTRS)

Air ejection from leading edge of airfoil used for controlled decrease of lift. Pneumatic-spoiler principle developed for equalizing lift on helicopter rotor blades. Also used to enhance aerodynamic control of short-fuselage or rudderless aircraft such as "flying-wing" airplanes. Leading-edge injection increases maneuverability of such high-performance fixed-wing aircraft as fighters.

Hunter, D.; Krauss, T.

1991-01-01

165

30 CFR 57.16016 - Lift trucks.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 2012-07-01 false Lift trucks. 57.16016 Section 57.16016...Materials Storage and Handling § 57.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the:...

2012-07-01

166

30 CFR 56.16016 - Lift trucks.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 2011-07-01 false Lift trucks. 56.16016 Section 56.16016...Materials Storage and Handling § 56.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the—...

2011-07-01

167

30 CFR 57.16016 - Lift trucks.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 2010-07-01 false Lift trucks. 57.16016 Section 57.16016...Materials Storage and Handling § 57.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the:...

2010-07-01

168

30 CFR 56.16016 - Lift trucks.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 2010-07-01 false Lift trucks. 56.16016 Section 56.16016...Materials Storage and Handling § 56.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the—...

2010-07-01

169

30 CFR 56.16016 - Lift trucks.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 2012-07-01 false Lift trucks. 56.16016 Section 56.16016...Materials Storage and Handling § 56.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the—...

2012-07-01

170

30 CFR 57.16016 - Lift trucks.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 2011-07-01 false Lift trucks. 57.16016 Section 57.16016...Materials Storage and Handling § 57.16016 Lift trucks. Fork and other similar types of lift trucks shall be operated with the:...

2011-07-01

171

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. PMID:20470400

2010-01-01

172

Occupational Asthma  

Microsoft Academic Search

Occupational asthma (OA) is the most common occupational lung disease in industrialized countries. It is suspected that 9\\u000a to 15% of all cases of adult-onset asthma are caused by work factors. OA is a phenotype of the asthma in the workplace that\\u000a also includes irritant-induced asthma, work-aggravated asthma and variants forms such as occupational eosinophilic bronchitis.\\u000a More than 350 agents

Joaquin Sastre

173

Summary of Lift and Lift/Cruise Fan Powered Lift Concept Technology  

NASA Technical Reports Server (NTRS)

A summary is presented of some of the lift and lift/cruise fan technology including fan performance, fan stall, ground effects, ingestion and thrust loss, design tradeoffs and integration, control effectiveness and several other areas related to vertical short takeoff and landing (V/STOL) aircraft conceptual design. The various subjects addressed, while not necessarily pertinent to specific short takeoff/vertical landing (STOVL) supersonic designs being considered, are of interest to the general field of lift and lift/cruise fan aircraft designs and may be of importance in the future. The various wind tunnel and static tests reviewed are: (1) the Doak VZ-4 ducted fan, (2) the 0.57 scale model of the Bell X-22 ducted fan aircraft, (3) the Avrocar, (4) the General Electric lift/cruise fan, (5) the vertical short takeoff and landing (V/STOL) lift engine configurations related to ingestion and consequent thrust loss, (6) the XV-5 and other fan-in-wing stall consideration, (7) hybrid configurations such as lift fan and lift/cruise fan or engines, and (8) the various conceptual design studies by air-frame contractors. Other design integration problems related to small and large V/STOL transport aircraft are summarized including lessons learned during more recent conceptual design studies related to a small executive V/STOL transport aircraft.

Cook, Woodrow L.

1993-01-01

174

Occupational Asthma  

Microsoft Academic Search

\\u000a \\u000a \\u000a \\u000a \\u000a  \\u000a \\u000a Occupational asthma is the most common occupational lung disease.\\u000a \\u000a \\u000a \\u000a \\u000a  \\u000a \\u000a Occupational asthma and work-aggravated asthma are the two forms of asthma causally related to the workplace.\\u000a \\u000a \\u000a \\u000a \\u000a  \\u000a \\u000a Reactive airways dysfunction syndrome is a separate entity and a subtype of occupational asthma.\\u000a \\u000a \\u000a \\u000a \\u000a  \\u000a \\u000a The diagnosis of occupational asthma is most often made on clinical grounds; the goldstandard test, specific inhalation

Nicholas J. Kenyon; Brian M. Morrissey; Timothy E. Albertson

175

Occupational Literacy: Requirements and Instructional Response.  

ERIC Educational Resources Information Center

The average worker spends 2.5 hours per day in occupational reading or writing, yet most classrooms fail to teach the reading and writing competencies required in skilled and semi-skilled job contexts. Occupational reading requires use of external references and following of directions, with a heavy dependence on prior knowledge and on insight.…

Rush, R. Timothy

176

Approximate Lifted Belief Propagation Parag Singla  

E-print Network

Approximate Lifted Belief Propagation Parag Singla Department of Computer Science University}@cs.washington.edu Abstract Lifting can greatly reduce the cost of inference on first- order probabilistic models, but constructing the lifted network can itself be quite costly. In addition, the mini- mal lifted network is often

Singla, Parag

177

Comparison of serum testosterone and androstenedione responses to weight lifting in men and women  

Microsoft Academic Search

Summary  To determine if a sex difference exists in the androgen response to heavy-resistance exercise, serum testosterone (T) and androstenedione (A) concentrations were measured in 20 men and 20 women before and during a 2-h period following 30 min of weight lifting. Hormone concentrations from venous blood samples were determined by radioimmunoassay. Prior to weight lifting, T for men (3.51±0.24 ng·ml–1)

Lawrence W. Weiss; Kirk J. Cureton; Frederick N. Thompson

1983-01-01

178

Occupational Cancer  

MedlinePLUS

... the value of using this information for public health surveillance and research with the ultimate goal of decreasing ... Content source: National Institute for Occupational Safety and Health Division of Surveillance, Hazard Evaluations, and Field Studies Home A-Z ...

179

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 ...

180

Occupational Science & Occupational Therapy Master of Occupational Therapy  

E-print Network

Occupational Science & Occupational Therapy Master of Occupational Therapy 2013 - 2014 STUDENT Earthquake Safety 9 Getting to UBC 9 Bus 9 Rideshare/Carpooling 9 Parking 9 Cycling 9 Learning Resources 10 of Occupational Therapy 11 Professional Organizations 11 College of Occupational Therapists of British Columbia

Michelson, David G.

181

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, ˝?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, ˝v(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

2012-01-01

182

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

183

Serrated-Planform Lifting-Surfaces  

NASA Technical Reports Server (NTRS)

A novel set of serrated-planform lifting surfaces produce unexpectedly high lift coefficients at moderate to high angles-of-attack. Each serration, or tooth, is designed to shed a vortex. The interaction of the vortices greatly enhances the lifting capability over an extremely large operating range. Variations of the invention use serrated-planform lifting surfaces in planes different than that of a primary lifting surface. In an alternate embodiment, the individual teeth are controllably retractable and deployable to provide for active control of the vortex system and hence lift coefficient. Differential lift on multiple serrated-planform lifting surfaces provides a means for vehicle control. The important aerodynamic advantages of the serrated-planform lifting surfaces are not limited to aircraft applications but can be used to establish desirable performance characteristics for missiles, land vehicles, and/or watercraft.

McGrath, Brian E. (Inventor); Wood, Richard M. (Inventor)

1999-01-01

184

Artificial lifting device and method  

SciTech Connect

An artificial lifting device has a downhole valve which intermittently directs operating gas to the top of a collection chamber to promote the lifting of oil below the valve upwardly through an annulus defined between a cylindrical housing supporting the valve and an external cylindrical member through which the housing extends. Gas is alternately injected to the top of the chamber through an injection port and vented to the surface through a vent port. An exhaust conduit, separate from the source of pressurized gas running from the surface to the valve, communicates the vent port with the surface when the device is in the vent mode.

Blann, J.R.; Abercrombie, B.A.; West, R.C.

1984-01-24

185

TCA High Lift Preliminary Assessment  

NASA Technical Reports Server (NTRS)

This paper presents a TCA (Technology Concept Airplane) High lift Preliminary Assessment. The topics discussed are: 1) Model Description; 2) Data Repeatability; 3) Effect of Inboard L.E. (Leading Edge) Flap Span; 4) Comparison of 14'x22' TCA-1 With NTF (National Transonic Facility) Modified Ref. H; 5) Comparison of 14'x22' and NTF Ref. H Results; 6) Effect of Outboard Sealed Slat on TCA; 7) TCA Full Scale Build-ups; 8) Full Scale L/D Comparisons; 9) TCA Full Scale; and 10) Touchdown Lift Curves. This paper is in viewgraph form.

Wyatt, G. H.; Polito, R. C.; Yeh, D. T.; Elzey, M. E.; Tran, J. T.; Meredith, Paul T.

1999-01-01

186

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. PMID:21694786

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

2010-01-01

187

Occupational Neurotoxic Diseases in Taiwan  

PubMed Central

Occupational neurotoxic diseases have become increasingly common in Taiwan due to industrialization. Over the past 40 years, Taiwan has transformed from an agricultural society to an industrial society. The most common neurotoxic diseases also changed from organophosphate poisoning to heavy metal intoxication, and then to organic solvent and semiconductor agent poisoning. The nervous system is particularly vulnerable to toxic agents because of its high metabolic rate. Neurological manifestations may be transient or permanent, and may range from cognitive dysfunction, cerebellar ataxia, Parkinsonism, sensorimotor neuropathy and autonomic dysfunction to neuromuscular junction disorders. This study attempts to provide a review of the major outbreaks of occupational neurotoxins from 1968 to 2012. A total of 16 occupational neurotoxins, including organophosphates, toxic gases, heavy metals, organic solvents, and other toxic chemicals, were reviewed. Peer-reviewed articles related to the electrophysiology, neuroimaging, treatment and long-term follow up of these neurotoxic diseases were also obtained. The heavy metals involved consisted of lead, manganese, organic tin, mercury, arsenic, and thallium. The organic solvents included n-hexane, toluene, mixed solvents and carbon disulfide. Toxic gases such as carbon monoxide, and hydrogen sulfide were also included, along with toxic chemicals including polychlorinated biphenyls, tetramethylammonium hydroxide, organophosphates, and dimethylamine borane. In addition we attempted to correlate these events to the timeline of industrial development in Taiwan. By researching this topic, the hope is that it may help other developing countries to improve industrial hygiene and promote occupational safety and health care during the process of industrialization. PMID:23251841

Liu, Chi-Hung; Huang, Chu-Yun

2012-01-01

188

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

E-print Network

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...

Burgers, Phillip; Alexander, David E.

2012-05-21

189

The lifting model for reconfiguration  

Microsoft Academic Search

Given a pair of start and target configurations, each consisting of n pairwise disjoint disks in the plane, what is the minimum number of moves that suffice for transforming the start configuration into the target configuration? In one move a disk is lifted from the plane and placed back in the plane at another location, without intersecting any other disk.

Sergey Bereg; Adrian Dumitrescu

2005-01-01

190

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

191

Joint Occupancy.  

ERIC Educational Resources Information Center

This annotated bibliography includes summaries of 15 articles and reports dealing with the joint use of buildings and facilities by schools and other public or private organizations. An introductory section describes the historical origins and development of the joint occupancy concept and examines the various economic and philosophical arguments…

Higham, Charlene Ellison

192

Lift-contractions Petr A. Golovach  

E-print Network

Lift-contractions Petr A. Golovach Dani¨el Paulusma Marcin Kami´nski Dimitrios M. Thilikos§ Abstract We introduce and study a partial order on graphs ­ lift-contractions. A graph H is a lift-contraction of a graph G if H can be obtained from G by a sequence of edge lifts and edge contractions. We give

Paulusma, Daniel

193

On Lifted PageRank, Kalman Filter and Towards Lifted Linear Program Solving  

E-print Network

On Lifted PageRank, Kalman Filter and Towards Lifted Linear Program Solving Babak Ahmadi, Canberra, Australia Scott.Sanner@nicta.com.au Abstract Lifted message passing algorithms exploit re- peated a lifted network of supernodes and superpotentials corresponding to sets of nodes and potentials

Kersting, Kristian

194

Lift and wakes of flying snakes Lift and wakes of flying snakes  

E-print Network

Lift and wakes of flying snakes Lift and wakes of flying snakes Anush Krishnan,1 John J. Socha,2 in generating lift. This paper presents a computational investigation of the aerodynamics of the cross cross-section of the species Chrysopelea paradisi, showing that a significant enhancement in lift

Socha, Jake

195

Reduce and Re-Lift: Bootstrapped Lifted Likelihood Maximization for MAP Fabian Hadiji and Kristian Kersting  

E-print Network

Reduce and Re-Lift: Bootstrapped Lifted Likelihood Maximization for MAP Fabian Hadiji and Kristian By handling whole sets of indistinguishable objects to- gether, lifted belief propagation approaches have ren. This additional evidence typically changes the structure of the lifted network: it may ex- pand or reduce it

Kersting, Kristian

196

Occupational Science & Occupational Therapy Master of Occupational Therapy  

E-print Network

Occupational Science & Occupational Therapy Master of Occupational Therapy 2013 - 2014 STUDENT Procedures 7 Fire Procedures 8 Earthquake Safety 9 Getting to UBC 9 Bus 9 Rideshare/Carpooling 9 Parking 9 and Therapy Equipment 10 Definition of Occupational Therapy 11 Professional Organizations 11 College

Michelson, David G.

197

Occupational Science & Occupational Therapy Master of Occupational Therapy  

E-print Network

Occupational Science & Occupational Therapy Master of Occupational Therapy 2014 - 2015 STUDENT Procedures 7 Fire Procedures 8 Earthquake Safety 9 Getting to UBC 9 Bus 9 Rideshare/Carpooling 9 Parking 9 and Therapy Equipment 10 Definition of Occupational Therapy 11 Professional Organizations 11 College

Ollivier-Gooch, Carl

198

SSRL Lift Plan Procedure Stanford Synchrotron Radiation Laboratory  

E-print Network

SSRL Lift Plan Procedure Stanford Synchrotron Radiation Laboratory Lead Author ______________________ Oct 16, 2006 SSRL Lift Plan Procedure (SSRL-LPP-000-R1) Page 1 of 7 #12;SSRL Lift Plan Procedure a Lift Plan ....................................................................... 5 3.1 General

Wechsler, Risa H.

199

Analysing Performance of Lift Systems in PEPA  

E-print Network

to quite complex multi­lift systems, with a high degree of parallelism and non­determinism present (eAnalysing Performance of Lift Systems in PEPA Amani El­Rayes and Marta Kwiatkowska and Steven Minton \\Lambda Abstract We use the stochastic process algebra PEPA [8] to specify lift sys­ tems

Oxford, University of

200

Vertical Lift - Not Just For Terrestrial Flight  

NASA Technical Reports Server (NTRS)

Autonomous vertical lift vehicles hold considerable potential for supporting planetary science and exploration missions. This paper discusses several technical aspects of vertical lift planetary aerial vehicles in general, and specifically addresses technical challenges and work to date examining notional vertical lift vehicles for Mars, Titan, and Venus exploration.

Young, Larry A

2000-01-01

201

Complex Contact and Lift Transformations I. Roulstone  

E-print Network

Complex Contact and Lift Transformations I. Roulstone and M. J. Sewell October 24, 2012 Abstract We study mappings from sets of real variables into complex variables, which extend features of lift the relationship between lifts in R2n+1 and the Cauchy- Riemann equations for functions of n complex variables

Roulstone, Ian

202

Lift-off Processes with Photoresists  

E-print Network

Lift-off Processes with Photoresists Version: 2009-12-15 Source: www.microchemicals.eu e-Mail: sales@microchemicals.eu Lift-off - Basic Questions and Criteria Beside wet or dry etching, lift-off is a common technique to pattern metal or dielectrica films in the �m or sub-�m range

Yoo, S. J. Ben

203

LIFTING IN SOBOLEV SPACES Jean Bourgain(1)  

E-print Network

LIFTING IN SOBOLEV SPACES Jean Bourgain(1) , Haim Brezis(2),(3) and Petru Mironescu(4) Introduction. The objective is to find a lifting "as regular as u permits." For example, if u is continuous one may choose. Brezis and L. Nirenberg [1]). In this paper we study the question of lifting in the framework

Paris-Sud XI, Université de

204

Lifting Galois representations over arbitrary number fields  

E-print Network

Lifting Galois representations over arbitrary number fields Yoshiyuki Tomiyama September 16, 2008 group of an arbitrary number field lifts to a charac- teristic zero p-adic representation, if local lifting problems at places above p are unobstructed. 1 Introduction Let k be a finite field

Nakamura, Iku

205

Lifting Special Generic Maps Osamu Saeki  

E-print Network

Lifting Special Generic Maps Osamu Saeki (Institute of Mathematics for Industry, Kyushu University) #12;Lifting Special Generic Maps Osamu Saeki (Institute of Mathematics for Industry, Kyushu University) #12;Lifting Special Generic Maps Osamu Saeki (Institute of Mathematics for Industry, Kyushu University

Saeki, Osamu

206

Superconvergent lift estimates through adjoint error analysis  

E-print Network

Superconvergent lift estimates through adjoint error analysis M.B. Giles and N.A. Pierce Oxford analysis to ob­ tain approximate values for integral quantities, such as lift and drag, which are twice, there are usually a few integral quanti­ ties of primary concern, such as lift and drag on an aircraft, total mass

Pierce, Niles A.

207

49 CFR 37.203 - Lift maintenance.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Lift maintenance. 37.203 Section 37...Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall...regular and frequent maintenance checks of lifts sufficient to determine if they are...

2011-10-01

208

49 CFR 37.203 - Lift maintenance.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Lift maintenance. 37.203 Section 37...Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall...regular and frequent maintenance checks of lifts sufficient to determine if they are...

2010-10-01

209

49 CFR 37.203 - Lift maintenance.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Lift maintenance. 37.203 Section 37...Over-the-Road Buses (OTRBs) § 37.203 Lift maintenance. (a) The entity shall...regular and frequent maintenance checks of lifts sufficient to determine if they are...

2012-10-01

210

Protect Your Back: Guidelines for Safer Lifting.  

ERIC Educational Resources Information Center

Examines back injury in teachers and child care providers; includes statistics, common causes of back pain (improper alignment, improper posture, improper lifting, and carrying), and types of back pain (acute and chronic). Focuses on preventing back injury, body mechanics for lifting and carrying, and proper lifting and carrying of children. (SD)

Cantu, Carolyn O.

2002-01-01

211

75 FR 33320 - Notice of Issuance of Final Determination Concerning a Lift Unit for an Overhead Patient Lift...  

Federal Register 2010, 2011, 2012, 2013

...of Issuance of Final Determination Concerning a Lift Unit for an Overhead Patient Lift System; Correction AGENCY: U.S. Customs and...determination concerning the country of origin of a lift unit for an overhead patient lift system. The...

2010-06-11

212

The effects of horizontal load speed and lifting frequency on lifting technique and biomechanics  

Microsoft Academic Search

Lifting loads that have a horizontal velocity (e.g. lifting from a conveyor) is often seen in industry and it was hypothesised that the inertial characteristics of these loads may influence lifting technique and low back stress. Seventeen male participants were asked to perform lifting tasks under conditions of four horizontal load speeds (0 m\\/s, 0.7 m\\/s, 1.3 m\\/s and 2.4 m\\/s) and two lifting

Boyi Dai; Sangeun Jin; Xiaopeng Ning; Gary A. Mirka

2010-01-01

213

The Lifting Model for Reconfiguration  

Microsoft Academic Search

Given a pair of start and target configurations, each consisting of n pairwise disjoint disks in the plane, what is the minimum\\u000a number of moves that suffice for transforming the start configuration into the target configuration? In one move a disk is\\u000a lifted from the\\u000a plane and placed back in the plane at another location, without intersecting any other disk.

Sergey Bereg; Adrian Dumitrescu

2006-01-01

214

Numerical simulation of lifting mechanism  

NASA Astrophysics Data System (ADS)

The article presents a method of kinematical synthesis of planar multilink linkage with adjustable closed loop, which is designed for a plane-parallel motion of the output lever and can be used as an actuator for lifting mechanism. Methods of kinematical synthesis and analysis are developed in this paper allow to design the scheme of mechanism that performs the given function of displacement of the output link, and to evaluate the kinematical characteristics of the designed layout.

Gebel, E. S.; Zhursenbaev, B. I.; Solomin, V. Yu.

2012-11-01

215

Hydrodynamic lift on bound vesicles  

E-print Network

Bound vesicles subject to lateral forces such as arising from shear flow are investigated theoretically by combining a lubrication analysis of the bound part with a scaling approach to the global motion. A minor inclination of the bound part leads to significant lift due to the additive effects of lateral and tank-treading motions. With increasing shear rate, the vesicle unbinds from the substrate at a critical value. Estimates are in agreement with recent experimental data.

Udo Seifert

1999-01-12

216

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

217

Occupational Sex Roles and Occupational Prestige.  

ERIC Educational Resources Information Center

Past studies on the sex-typing of occupations have used a single bipolar scale, ranging from masculinity to femininity. An empirical examination of both occupational sex roles and occupational prestige was conducted using two unipolar scales to assess masculinity and femininity. College students (N=183) rated 94 occupations, which were then…

Simerly, D. Emily; Ruback, R. Barry

218

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. PMID:20154187

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

2010-01-01

219

Automation of Workplace Lifting Hazard Assessment for Musculoskeletal Injury Prevention  

PubMed Central

Objectives Existing methods for practically evaluating musculoskeletal exposures such as posture and repetition in workplace settings have limitations. We aimed to automate the estimation of parameters in the revised United States National Institute for Occupational Safety and Health (NIOSH) lifting equation, a standard manual observational tool used to evaluate back injury risk related to lifting in workplace settings, using depth camera (Microsoft Kinect) and skeleton algorithm technology. Methods A large dataset (approximately 22,000 frames, derived from six subjects) of simultaneous lifting and other motions recorded in a laboratory setting using the Kinect (Microsoft Corporation, Redmond, Washington, United States) and a standard optical motion capture system (Qualysis, Qualysis Motion Capture Systems, Qualysis AB, Sweden) was assembled. Error-correction regression models were developed to improve the accuracy of NIOSH lifting equation parameters estimated from the Kinect skeleton. Kinect-Qualysis errors were modelled using gradient boosted regression trees with a Huber loss function. Models were trained on data from all but one subject and tested on the excluded subject. Finally, models were tested on three lifting trials performed by subjects not involved in the generation of the model-building dataset. Results Error-correction appears to produce estimates for NIOSH lifting equation parameters that are more accurate than those derived from the Microsoft Kinect algorithm alone. Our error-correction models substantially decreased the variance of parameter errors. In general, the Kinect underestimated parameters, and modelling reduced this bias, particularly for more biased estimates. Use of the raw Kinect skeleton model tended to result in falsely high safe recommended weight limits of loads, whereas error-corrected models gave more conservative, protective estimates. Conclusions Our results suggest that it may be possible to produce reasonable estimates of posture and temporal elements of tasks such as task frequency in an automated fashion, although these findings should be confirmed in a larger study. Further work is needed to incorporate force assessments and address workplace feasibility challenges. We anticipate that this approach could ultimately be used to perform large-scale musculoskeletal exposure assessment not only for research but also to provide real-time feedback to workers and employers during work method improvement activities and employee training. PMID:24987523

2014-01-01

220

Occupational Activity and Bone Mineral Density in Postmenopausal Women in England  

Microsoft Academic Search

:   Few studies have assessed the relationship between occupational activity and bone mineral density (BMD), although two case–control\\u000a studies have reported a protective effect of occupational activity on hip fracture. In the present study 580 postmenopausal\\u000a women aged 45–61 years completed a risk factor questionnaire including a detailed occupational history. For each job, hours\\u000a spent sitting, standing, walking, lifting and

C. A. C. Coupland; M. J. Grainge; S. J. Cliffe; D. J. Hosking; C. E. D. Chilvers

2000-01-01

221

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

222

Minimal access cranial suspension lift: a modified S-lift.  

PubMed

There is a strong trend at hand toward less dramatic facial rejuvenation surgery. Most of the authors' patients want a cosmetic improvement but not at the cost of prolonged disfigurement or a high risk of complications. In 1999, a very simple but effective rhytidectomy technique, termed an S-lift, was described in the literature and was adopted by the authors. Its basic principle is the suspension of sagging facial features by a strong, permanent purse-string suture. The procedure is performed with the patient under local anesthesia. Significant modifications were applied to the incision, to the purse-string suture anchoring site, and to the direction and shape of the skin excision. The authors named the modified procedure the minimal access cranial suspension lift to specifically describe the concept of the technique. Through an inverted L-shaped preauricular incision with extension below the sideburn, a limited skin undermining is performed. Two strong, permanent purse-string sutures are woven into the superficial musculoaponeurotic system tissues in a vertical U and an oblique O shape, initiating from a strong anchorage in the deep temporal fascia at the level of the helical crus. Tying these sutures produces a very powerful vertical correction of descended facial features that acts mainly on the jowls and the upper neck. The procedure can be extended by continuing the dissection over the malar fat pad, placing a third vertical purse-string suture with strong action on the nasolabial groove, and vertically repositioning the midfacial volumes. During 20 months, pleasing results and a very low complication rate were obtained in 88 consecutive patients with a mean age of 551/2 years. In this article, the authors provide a detailed description of the anesthetic and surgical technique, a demonstration of the results in different patient age categories, and a discussion comparing the minimal access cranial suspension lift with other types of facial rejuvenation procedures. PMID:11994618

Tonnard, Patrick; Verpaele, Alexis; Monstrey, Stan; Van Landuyt, Koen; Blondeel, Philippe; Hamdi, Moustapha; Matton, Guido

2002-05-01

223

Influence of Lift Offset on Rotorcraft Performance  

NASA Technical Reports Server (NTRS)

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 utilizing a lift offset is examined, including rotor performance optimized for hover and high-speed cruise. The ideal induced power loss of coaxial rotors in hover and twin rotors in forward flight is presented. The aerodynamic modeling requirements for performance calculations are evaluated, including wake and drag models for the high speed flight condition. The influence of configuration on the performance of rotorcraft with lift-offset rotors is explored, considering tandem and side-by-side rotorcraft as well as wing-rotor lift share.

Johnson, Wayne

2008-01-01

224

Lift enhancement by trapped vortex  

NASA Technical Reports Server (NTRS)

The viewgraphs and discussion of lift enhancement by trapped vortex are provided. Efforts are continuously being made to find simple ways to convert wings of aircraft from an efficient cruise configuration to one that develops the high lift needed during landing and takeoff. The high-lift configurations studied here consist of conventional airfoils with a trapped vortex over the upper surface. The vortex is trapped by one or two vertical fences that serve as barriers to the oncoming stream and as reflection planes for the vortex and the sink that form a separation bubble on top of the airfoil. Since the full three-dimensional unsteady flow problem over the wing of an aircraft is so complicated that it is hard to get an understanding of the principles that govern the vortex trapping process, the analysis is restricted here to the flow field illustrated in the first slide. It is assumed that the flow field between the two end plates approximates a streamwise strip of the flow over a wing. The flow between the endplates and about the airfoil consists of a spanwise vortex located between the suction orifices in the endplates. The spanwise fence or spoiler located near the nose of the airfoil serves to form a separated flow region and a shear layer. The vorticity in the shear layer is concentrated into the vortex by withdrawal of fluid at the suction orifices. As the strength of the vortex increases with time, it eventually dominates the flow in the separated region so that a shear or vertical layer is no longer shed from the tip of the fence. At that point, the vortex strength is fixed and its location is such that all of the velocity contributions at its center sum to zero thereby making it an equilibrium point for the vortex. The results of a theoretical analysis of such an idealized flow field are described.

Rossow, Vernon J.

1992-01-01

225

HSR High-Lift Technology Overview  

NASA Technical Reports Server (NTRS)

High-lift system performance will have a large impact on airplane noise and weight. Successful completion of PCD1 activities provided greater understanding of aerodynamic characteristics and configuration features important to high-lift system performance including: 1) Reynolds number effects (Ref. H); 2) Propulsion/airframe integration effects; and 3) Planform effects, canard/3-surface, alternate high-lift concepts, etc. PCD2 plans are aimed at achieving technology development performance goals and increasing technology readiness level for Technology Concept.

Applin, Z. T.

1999-01-01

226

Development of predictive equations for lifting strengths.  

PubMed

The purpose of the study was to determine relationship between lifting strengths of male and female subjects and body posture, type of lift (stoop or squat) and velocity of lift. Thirty normal young adults (18 males and 12 females) volunteered for the study. All subjects were required to perform a total of 56 tasks. Of these, 28 were stoop lifts and 28 were squat lifts. In each of the categories of stoop and squat lifts, the strengths were tested in standard posture, isokinetic (linear velocity of 500 mm/s), and isometric modes at half, three-quarters and full horizontal individual reach distances in sagittal, 30 degrees lateral and 60 degrees lateral planes. The strengths were measured using a static dynamic strength tester with a load cell and an IBM microcomputer with an A/D card. The peak and average strength values were extracted and statistically compared across conditions and gender (ANOVA). Finally a multiple regression analysis was carried out to predict strength as a function of reach, posture and velocity of lift. The ANOVA revealed a highly significant effect of gender, reach, plane and velocity (p < 0.01). All regression equations (108) were significant (p < 0.01), and more than 70% of variance in lifting strength was accounted for by the anthropometric variables and sagittal plane strength values. Such an established relationship allows one to predict the human lifting strength capabilities for industrial application based on simple anthropometric and strength characteristics. PMID:15677035

Kumar, S

1995-10-01

227

Lift generation by the avian tail.  

PubMed

Variation with tail spread of the lift generated by a bird tail was measured on mounted, frozen European starlings (Sturnus vulgaris) in a wind tunnel at a typical air speed and body and tail angle of attack in order to test predictions of existing aerodynamic theories modelling tail lift. Measured lift at all but the lowest tail spread angles was significantly lower than the predictions of slender wing, leading edge vortex and lifting line models of lift production. Instead, the tail lift coefficient based on tail area was independent of tail spread, tail aspect ratio and maximum tail span. Theoretical models do not predict bird tail lift reliably and, when applied to tail morphology, may underestimate the aerodynamic optimum tail feather length. Flow visualization experiments reveal that an isolated tail generates leading edge vortices as expected for a low-aspect ratio delta wing, but that in the intact bird body-tail interactions are critical in determining tail aerodynamics: lifting vortices shed from the body interact with the tail and degrade tail lift compared with that of an isolated tail. PMID:11454286

Maybury, W J; Rayner, J M; Couldrick, L B

2001-07-22

228

Lift generation by the avian tail.  

PubMed Central

Variation with tail spread of the lift generated by a bird tail was measured on mounted, frozen European starlings (Sturnus vulgaris) in a wind tunnel at a typical air speed and body and tail angle of attack in order to test predictions of existing aerodynamic theories modelling tail lift. Measured lift at all but the lowest tail spread angles was significantly lower than the predictions of slender wing, leading edge vortex and lifting line models of lift production. Instead, the tail lift coefficient based on tail area was independent of tail spread, tail aspect ratio and maximum tail span. Theoretical models do not predict bird tail lift reliably and, when applied to tail morphology, may underestimate the aerodynamic optimum tail feather length. Flow visualization experiments reveal that an isolated tail generates leading edge vortices as expected for a low-aspect ratio delta wing, but that in the intact bird body-tail interactions are critical in determining tail aerodynamics: lifting vortices shed from the body interact with the tail and degrade tail lift compared with that of an isolated tail. PMID:11454286

Maybury, W J; Rayner, J M; Couldrick, L B

2001-01-01

229

The lift-fan aircraft: Lessons learned  

NASA Technical Reports Server (NTRS)

This report summarizes the highlights and results of a workshop held at NASA Ames Research Center in October 1992. The objective of the workshop was a thorough review of the lessons learned from past research on lift fans, and lift-fan aircraft, models, designs, and components. The scope included conceptual design studies, wind tunnel investigations, propulsion systems components, piloted simulation, flight of aircraft such as the SV-5A and SV-5B and a recent lift-fan aircraft development project. The report includes a brief summary of five technical presentations that addressed the subject The Lift-Fan Aircraft: Lessons Learned.

Deckert, Wallace H.

1995-01-01

230

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. PMID:8549481

Chan-Yeung, M

1995-01-01

231

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

232

OCCUPATIONAL HEALTH AND SAFETY  

E-print Network

OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT SYSTEM Department of Occupational Health and Safety Revised December 2009 #12;Occupational Health and Safety (OHS) Management System 1. Introduction.............................................................................................................. 3 2.2 Management of Health and Safety

233

OCCUPATIONAL SAFETY and HEALTH  

E-print Network

MARYLAND OCCUPATIONAL SAFETY and HEALTH ACT safety and health protection on the job STATE OCCUPATIONAL SAFETY AND HEALTH STANDARDS, AND OTHER APPLICABLE REGULATIONS MAY BE OBTAINED FROM Complaints about State Program administration may be made to Regional Administrator, Occupational Safety

Weaver, Harold A. "Hal"

234

Maximum acceptable weights for asymmetric lifting of Chinese females  

Microsoft Academic Search

This study used the psychophysical approach to evaluate the effects of asymmetric lifting on the maximum acceptable weight of lift (MAWL) and the resulting heart rate, oxygen uptake and rating of perceived exertion (RPE). A randomized complete block factorial design was employed. Twelve female college students lifted weights at three different lifting frequencies (one-time maximum, 1 and 4 lifts\\/min) in

Swei-Pi Wu

2003-01-01

235

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

236

Analyzing the Redesign of a Distributed Lift System in UPPAAL  

E-print Network

Analyzing the Redesign of a Distributed Lift System in UPPAAL Jun Pang1 , Bart Karstens1 and Wana, 1081 HV Amsterdam, The Netherlands, wanf@cs.vu.nl Abstract. An existing distributed lift system by analyzing the redesign of a distributed lift system. This lift system is used in real life for lifting

Fokkink, Wan

237

Heavy LIFting: tumor promotion and radioresistance in NPC  

PubMed Central

The epithelial-derived nasopharyngeal carcinoma (NPC) is a rare tumor in most of the world; however, it is common in southern China, northern Africa, and Alaska. NPC is often left undiagnosed and untreated until a late stage of disease. Furthermore, while radiation therapy is effective against this tumor, local recurrence due to radioresistance is an important clinical problem. In this issue, Liu et al. report on their identification of the IL-6 family cytokine leukemia inhibitory factor (LIF) as a serum predictor of local NPC recurrence following radiation therapy. The authors developed this initial finding to discover a role for the LIF/LIFR/mTORC1 signaling axis in NPC tumor cell growth as well as radioresistance. PMID:24270417

Luftig, Micah

2013-01-01

238

Ground cloud related weather modification effects. [heavy lift launch vehicles  

NASA Technical Reports Server (NTRS)

The principal concerns about inadvertent weather modification by the solar power satellite system rocket effluents are discussed, namely the possibility that the ground cloud might temporarily modify local weather and the cumulative effects of nearly 500 launches per year. These issues are discussed through the consideration of (1) the possible alteration of the microphysical processes of clouds in the general area due to rocket effluents and debris and cooling water entrained during the launch and (2) the direct dynamical and thermodynamical responses to the inputs of thermal energy and moisture from the rocket exhaust for given ambient meteorological conditions. The huge amount of thermal energy contained in the exhaust of the proposed launch vehicle would in some situations induce a saturated, wet convective cloud or enhance an existing convective activity. Nevertheless, the effects would be limited to the general area of the launch site. The observed long lasting high concentrations of cloud condensation nuclei produced during and after a rocket launch may appreciably affect the frequency of occurrence and persistence of fogs and haze. In view of the high mission frequency proposed for the vehicle launches, a potential exists for a cumulative effect.

Lee, J.

1980-01-01

239

Homegrown technology for Japan's heavy-lift launcher  

NASA Astrophysics Data System (ADS)

A description is given of the H-II rocket now being designed and developed in Japan, which will join the U.S. Titan and the European Ariane in launching 2-ton satellites into geostationary orbit. To maximize reliability, emphasize safety, and reduce costs, the H-II rocket is designed to be a simple system that profits from existing technology and experience. The H-II is designed to have an overall system reliability of 0.96, about the actual rate of success of the U.S. Delta, Atlas-Centaur, and Titan. It is a two-stage vehicle using liquid propulsion, matching boosters, and an innovative guidance system. New launch facilities being built for the rocket are described.

Miyazawa, Masafumi

1989-03-01

240

Heavy lift crane/derrick barge stability analysis  

E-print Network

Wave Run Load eadin Spec Height (div) Period (mm) Height Period (sec) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 10% 5% o% 10% 5 o/ 10% 180 180 090 090 135 135 4 5 6 I 8 4 5 6 7 8 4 5 4 5 4 5... 7 4 5 7 15. 0 19. 5 25. 5 29. 0 31. 5 17. 5 22. 0 25. 7 33. 0 37. 2 15. 75 19. 25 15. 0 19. 0 17. 1 22. 8 28. 75 15. 5 18. 4 28. 2 16. 5 2. 73 11. 5 9. 38 8. 20 16. 25 13. 25 11. 5 9. 56 8. 33 16. 08 13. 2 16. 5...

Loesch, Robert Morrison

2012-06-07

241

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

242

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

243

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

244

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

245

May the Force Be with You: Lift  

NSDL National Science Digital Library

Students revisit Bernoulli's principle (presented in lesson 1 of the Airplanes unit) and learn how engineers use this principle to design airplane wings. Airplane wings create lift by changing the pressure of the air around them. This is the first of four lessons exploring the four key forces in flight: lift, weight, thrust and drag.

Integrated Teaching And Learning Program

246

Constructing and Forbidding Automorphisms in Lifted Maps  

E-print Network

Constructing and Forbidding Automorphisms in Lifted Maps Dan Archdeacon Department of Mathematics an algebraic description of surfaces with boundary to study covering maps. The focus is on the relationship between automor­ phisms in the base and lifted maps. We show how to introduce and/or prohibit additional

Archdeacon, Dan

247

High-lift aerodynamics: Prospects and plans  

NASA Technical Reports Server (NTRS)

The emergence of high-lift aerodynamics is reviewed as one of the key technologies to the development of future subsonic transport aircraft. Airport congestion, community noise, economic competitiveness, and safety - the drivers that make high-lift an important technology - are discussed. Attention is given to the potentially synergistic integration of high-lift aerodynamics with two other advanced technologies: ultra-high bypass ratio turbofan engines and hybrid laminar flow control. A brief review of the ongoing high-lift research program at Ames Research Center is presented. Suggestions for future research directions are made with particular emphasis on the development and validation of computational codes and design methods. It is concluded that the technology of high-lift aerodynamics analysis and design should move boldly into the realm of high Reynolds number, three-dimensional flows.

Olson, Lawrence E.

1992-01-01

248

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

249

Lifted Linear Programming Martin Mladenov Babak Ahmadi Kristian Kersting  

E-print Network

Lifted Linear Programming Martin Mladenov Babak Ahmadi Kristian Kersting Knowledge Discovery Lifted inference approaches have rendered large, previously intractable probabilistic in- ference- tuitively, given a linear program (LP), we em- ploy a lifted variant of Gaussian belief propa- gation (Ga

Kersting, Kristian

250

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

251

The Condensate Lifting Lemma (CLL)  

Microsoft Academic Search

\\u000a \\u000a In this chapter we shall finalize the approach to this work’s main result, the Condensate Lifting Lemma (CLL). The statement\\u000a of CLL involves a “condensate” \\u000a F(X)Ä<\\/font\\u000a>[(A)\\\\vec]F(X)\\\\otimes \\\\vec{A}\\u000a . General condensates are defined in Sect. 3.1. The statement of CLL also involves categories A, B, S with functors \\u000a F<\\/font\\u000a>:A ®<\\/font\\u000a> S \\\\Phi :\\\\mathcal{A} \\\\rightarrow \\\\mathcal{S}\\u000a and \\u000a Y<\\/font\\u000a>:B

Pierre Gillibert; Friedrich Wehrung

252

Printed Tuesday, February 27, 2001 1 DDJ/2001/papers/LiftCorrelations/correlaLift.doc Power Law Correlations for Lift from  

E-print Network

Printed Tuesday, February 27, 2001 1 · DDJ/2001/papers/LiftCorrelations/correlaLift.doc Power Law Correlations for Lift from Direct Numerical Simulation of Solid-Liquid Flow Daniel D. Joseph Department. .............................................................................................................. 2 Single particle lift off and levitation to equilibrium

Joseph, Daniel D.

253

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.

254

Occupant Protection Project  

NASA Technical Reports Server (NTRS)

Topics include occupant protection overview with a focus on crew protection during dynamic phases of flight; occupant protection collaboration; modeling occupant protection; occupant protection considerations; project approach encompassing analysis tools, injury criteria, and testing program development; injury criteria update methodology, unique effects of pressure suits and other factors; and a summary.

Bopp, Genie; Somers, Jeff; Granderson, Brad; Gernhardt, Mike; Currie, Nancy; Lawrence, Chuck

2010-01-01

255

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.

256

Rotating cylinder design as a lifting generator  

NASA Astrophysics Data System (ADS)

The airfoil shape of a wing has always been the design to generate lift. But few realized that a simple rotating cylinder can also create lift. However, the explanation and study of how a rotating cylinder creates lift are still complex. In remote area where it is difficult for air vehicle to access, the exploration and discovery of different configuration for design concept is rather important. Due to this reason, there is a need to think of a lift generator that can produce better lift (few fold better than conventional airfoil) at lower speed to take off in a short distance of time. This paper will explain the conditions and the design of such a wing using the rotating cylinder concept that will take off in a short time and requires little takeoff and landing strip. Spokes will be attached to the cylinder to force the surrounding air to rotate along with the cylinder. This will create a vortex that hastens the speed of the air on top of the cylinder and at the same time retarding the speed of air below the cylinder. From the results, the rougher surface cylinder produces more lift when rotating and also, higher speed rotation of the cylinder greatly changes the speed of the surrounding air, thus better lift.

Asrokin, Azharrudin; Rizal Ramly, Mohammad; Halim Ahmad, Abdul

2013-12-01

257

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

2013-01-01

258

Geometry program for aerodynamic lifting surface theory  

NASA Technical Reports Server (NTRS)

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. The data which is generated by the program is stored on disk files or tapes for later use by programs which calculate an influence matrix, plot the wing planform, and evaluate the loads on the wing. In addition to processing data for subsequent use in a lifting surface analysis, the program is useful for computing area and mean geometric chords of the wing and control surfaces.

Medan, R. T.

1973-01-01

259

Remote lift fan study program, volume 4  

NASA Technical Reports Server (NTRS)

A study program to select and conduct preliminary design of advanced technology lift fan systems to meet low noise goals of future V/STOL transport aircraft is discussed. This volume contains results of additional studies conducted to support the main preliminary design effort done under the Remote Lift Fan Study Program (Contract NAS3-14406) and a companion effort, the Integral Lift Fan Study (NAS3-14404). These results cover engine emission study, a review of existing engines for research aircraft application and support data for aircraft studies.

1973-01-01

260

Wingless Flight: The Lifting Body Story  

NASA Technical Reports Server (NTRS)

Wingless Flight tells the story of the most unusual flying machines ever flown, the lifting bodies. It is my story about my friends and colleagues who committed a significant part of their lives in the 1960s and 1970s to prove that the concept was a viable one for use in spacecraft of the future. This story, filled with drama and adventure, is about the twelve-year period from 1963 to 1975 in which eight different lifting-body configurations flew. It is appropriate for me to write the story, since I was the engineer who first presented the idea of flight-testing the concept to others at the NASA Flight Research Center. Over those twelve years, I experienced the story as it unfolded day by day at that remote NASA facility northeast of los Angeles in the bleak Mojave Desert. Benefits from this effort immediately influenced the design and operational concepts of the winged NASA Shuttle Orbiter. However, the full benefits would not be realized until the 1990s when new spacecraft such as the X-33 and X-38 would fully employ the lifting-body concept. A lifting body is basically a wingless vehicle that flies due to the lift generated by the shape of its fuselage. Although both a lifting reentry vehicle and a ballistic capsule had been considered as options during the early stages of NASA's space program, NASA initially opted to go with the capsule. A number of individuals were not content to close the book on the lifting-body concept. Researchers including Alfred Eggers at the NASA Ames Research Center conducted early wind-tunnel experiments, finding that half of a rounded nose-cone shape that was flat on top and rounded on the bottom could generate a lift-to-drag ratio of about 1.5 to 1. Eggers' preliminary design sketch later resembled the basic M2 lifting-body design. At the NASA Langley Research Center, other researchers toyed with their own lifting-body shapes. Meanwhile, some of us aircraft-oriented researchers at the, NASA Flight Research Center at Edwards Air Force Base (AFB) in California were experiencing our own fascination with the lifting-body concept. A model-aircraft builder and private pilot on my own time, I found the lifting-body idea intriguing. I built a model based on Eggers' design, tested it repeatedly, made modifications in its control and balance characteristics along the way, then eventually presented the concept to others at the Center, using a film of its flights that my wife, Donna and I had made with our 8-mm home camera.

Reed, R. Dale; Lister, Darlene (Editor); Huntley, J. D. (Editor)

1997-01-01

261

Midface lift: our current approaches.  

PubMed

In the last few years, surgery of the ageing face seems to have shifted from tissue uplifting and tightening to mere filling. We do not agree with this trend. We are positive that ageing brings about 2 basic phenomena: on one hand bone and fat volume reduction, whilst on the other a deterioration of the skin lining (elastosis) leading to an increase in its compliance and extension. We therefore deem of the utmost importance to couple soft tissue filling with indispensable tightening and repositioning together with resection of overabundant skin. For what concerns the mid-face area in particular, we suggest to resort to 3 different lifting techniques, according to the kind of defect to be treated. It is important to take the right pulling vector into consideration as well as the need of skin excess removal. The procedures can be tailored to suit any peculiar need such as malar bag, lower lid border malposition, tear trough deformity, etc. Different cases will be taken into consideration as examples of the various indications and techniques. PMID:25162240

Botti, G; Botti, C

2014-08-01

262

How good is jet lift VTOL technology  

NASA Technical Reports Server (NTRS)

The status of technologies for jet-lift V/STOL aircraft is examined, and a critical review of the performance of jet-lift VTOL aircraft built to date is made. Most jet-lift aircraft have suffered from adverse propulsion-induced effects during takeoff and landing. Flight dynamics of jet-lift aircraft have suffered from shortcomings in static and dynamic stability, control characteristics, and flight path control. Some of the main problems to be considered during the selection of a propulsion system arrangement for a V/STOL fighter are discussed. At present, experimental and analytical data on supersonic V/STOL configurations are insufficient to permit evaluating propulsion system arrangements.

Anderson, S. B.; Petersen, R. H.

1977-01-01

263

Thermal design considerations for a lifting aerobrake  

Microsoft Academic Search

This paper addresses several aspects of the thermal design of a lifting aerobrake, including the effects of lift-to-drag ratio, vehicle ballistic coefficient, and number of aeropasses. Results are presented as correlations from a three-degree-of-freedom trajectory model and iterations of a one-dimensional thermal analysis of the aerobrake itself. It is shown that aerobrake material selection is based upon the maximum heating

A. T. Dela Pena; K. D. Whitehead; K. R. Newcomer

1986-01-01

264

Occupational Health and Safety Manual  

E-print Network

Occupational Health and Safety Manual #12;1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 York University Occupational Health and Safety Policy and Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Occupational Health and Safety Legislation

265

A lifting surface theory for the analysis of nonplanar lifting systems  

NASA Technical Reports Server (NTRS)

A new nonlinear, nonplanar lifting surface theory is presented. The method is regarded as a lifting surface theory in that the effects of wing thickness are neglected, but none of the usual small perturbation assumptions inherent in most other lifting surface theories are made. The method represents nonplanar lifting systems by distributed vorticity, including the leading edge singular behavior characteristic of thin wings. The method is well suited to the computation of induced drag of nonplanar systems because leading edge suction is calculated from the leading edge singularity. The method has been used to compute the induced drag benefit of winglets (vortex diffusers), and the agreement with NASA experimental data is excellent.

Goldhammer, M. I.

1976-01-01

266

Spine loading during asymmetric lifting using one versus two hands  

Microsoft Academic Search

This study documented three-dimensional spinal loading associated with asymmetric lifting while using either one or two hands to perform the task. Lift asymmetry was de® ned as a function of the load origin relative to the sagittal plane of the body. Lifts occurred at 0, 30, or 608 oŚthe sagittal plane on both sides of the body (lifting from the

WILLIAM S. MARRAS; KERMIT G. DAVIS

1998-01-01

267

Optimal boundary control problems related to high-lift configurations  

E-print Network

Optimal boundary control problems related to high-lift configurations Christian John, Bernd R problems related to the aerodynamic optimiza- tion of flows around airfoils in high-lift configurations, 25]. Our paper deals with two problems, both related to high-lift configurations, where the lift

Tröltzsch, Fredi

268

TWO LIFT PCC PAVEMENTS TO MEET PUBLIC NEEDS  

E-print Network

TWO LIFT PCC PAVEMENTS TO MEET PUBLIC NEEDS TWO LIFT PCC PAVEMENTS TO MEETTWO LIFT PCC PAVEMENTS99PTEC99 EUROPEAN EXPERIENCEEUROPEAN EXPERIENCEEUROPEAN EXPERIENCE Countries employing two lift paving ­ France, Germany and Austria Lessons learned - 2-5.5 inch high quality surface courses - 8

269

Adapting the UPPAAL Model of a Distributed Lift System  

E-print Network

Adapting the UPPAAL Model of a Distributed Lift System Wan Fokkink1,2 , Allard Kakebeen, and Jun.pang@informatik.uni-oldenburg.de Abstract. Groote, Pang and Wouters (2001) analyzed an existing dis- tributed lift system using the process the synchronization mechanism between lifts, to explain a new problem that was reported by the developers of the lift

Fokkink, Wan

270

Liftings of Tree-Structured Markov Chains (Extended Abstract)  

E-print Network

Liftings of Tree-Structured Markov Chains (Extended Abstract) Thomas P. Hayes1 and Alistair, University of California at Berkeley Abstract. A "lifting" of a Markov chain is a larger chain obtained in such a way that the lifted chain projects down exactly to the original one. It is well known that lifting can

Sinclair, Alistair

271

Visual perception of fatigued lifting actions.  

PubMed

Fatigue-related changes in lifting kinematics may expose workers to undue injury risks. Early detection of accumulating fatigue offers the prospect of intervention strategies to mitigate such fatigue-related risks. In a first step towards this objective, this study investigated whether fatigue detection was accessible to visual perception and, if so, what was the key visual information required for successful fatigue discrimination. Eighteen participants were tasked with identifying fatigued lifts when viewing 24 trials presented using both video and point-light representations. Each trial comprised a pair of lifting actions containing a fresh and a fatigued lift from the same individual presented in counter-balanced sequence. Confidence intervals demonstrated that the frequency of correct responses for both sexes exceeded chance expectations (50%) for both video (68%±12%) and point-light representations (67%±10%), demonstrating that fatigued lifting kinematics are open to visual perception. There were no significant differences between sexes or viewing condition, the latter result indicating kinematic dynamics as providing sufficient information for successful fatigue discrimination. Moreover, results from single viewer investigation reported fatigue detection (75%) from point-light information describing only the kinematics of the box lifted. These preliminary findings may have important workplace applications if fatigue discrimination rates can be improved upon through future research. PMID:22938761

Fischer, Steven L; Albert, Wayne J; McGarry, Tim

2012-12-01

272

Survey of lift-fan aerodynamic technology  

NASA Technical Reports Server (NTRS)

Representatives of NASA Ames Research Center asked that a summary of technology appropriate for lift-fan powered short takeoff/vertical landing (STOVL) aircraft be prepared so that new programs could more easily benefit from past research efforts. This paper represents one of six prepared for that purpose. The authors have conducted or supervised the conduct of research on lift-fan powered STOVL designs and some of their important components for decades. This paper will first address aerodynamic modeling requirements for experimental programs to assure realistic, trustworthy results. It will next summarize the results or efforts to develop satisfactory specialized STOVL components such as inlets and flow deflectors. It will also discuss problems with operation near the ground, aerodynamics while under lift-fan power, and aerodynamic prediction techniques. Finally, results of studies to reduce lift-fan noise will be presented. The paper will emphasize results from large scale experiments, where available, for reasons that will be brought out in the discussion. Some work with lift-engine powered STOVL aircraft is also applicable to lift-fan technology and will be presented herein. Small-scale data will be used where necessary to fill gaps.

Hickey, David H.; Kirk, Jerry V.

1993-01-01

273

Lift and wakes of flying snakes  

NASA Astrophysics Data System (ADS)

Flying snakes use a unique method of aerial locomotion: they jump from tree branches, flatten their bodies, and undulate through the air to produce a glide. The shape of their body cross-section during the glide plays an important role in generating lift. This paper presents a computational investigation of the aerodynamics of the cross-sectional shape. Two-dimensional simulations of incompressible flow past the anatomically correct cross-section of the species Chrysopelea paradisi show that a significant enhancement in lift appears at a 35° angle of attack, above Reynolds numbers 2000. Previous experiments on physical models also obtained an increased lift, at the same angle of attack. The flow is inherently three-dimensional in physical experiments, due to fluid instabilities, and it is thus intriguing that the enhanced lift also appears in the two-dimensional simulations. The simulations point to the lift enhancement arising from the early separation of the boundary layer on the dorsal surface of the snake profile, without stall. The separated shear layer rolls up and interacts with secondary vorticity in the near-wake, inducing the primary vortex to remain closer to the body and thus cause enhanced suction, resulting in higher lift.

Krishnan, Anush; Socha, John J.; Vlachos, Pavlos P.; Barba, L. A.

2014-03-01

274

Illinois Occupational Skill Standards: Occupational Therapy Cluster.  

ERIC Educational Resources Information Center

This document, which is intended to serve as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in jobs in occupational therapy. Agency partners involved in this project include: the Illinois State board of Education, Illinois Community College…

Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

275

Newsletter of The Department of Occupational Science & Occupational Therapy  

E-print Network

OT LENS Newsletter of The Department of Occupational Science & Occupational Therapy Autumn 2013 Mentors Four dedicated and enthusiastic Occupational Therapy Fieldwork Educators were nominated back to her profession and was described by occupational therapy students as an excellent fieldwork

Handy, Todd C.

276

Occupational Radiation Exposures  

Cancer.gov

DCEG researchers are studying cancer risks among populations who are occupationally exposed to radiation. Chernobyl Clean-up Workers Mayak Nuclear Facility Workers U.S. Radiologic Technologists Interventional Fluoroscopists Print This Page Occupational

277

The effects of initial lifting height, load magnitude, and lifting speed on the peak dynamic L5\\/S1 moments  

Microsoft Academic Search

The purpose of this study was to quantify the peak dynamic bending moments on the spine during sagittal plane lifting as a function of the load's initial height above the floor, the load's magnitude, and the lifting speed. Ten male subjects participated in a repeated measures experiment in which 24 lifts were performed. The boxes lifted by the subjects contained

Steven A. Lavender; Gunnar B. J. Andersson; Owen D. Schipplein; Henry J. Fuentes

2003-01-01

278

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

279

May 27, 2010 18:1 WSPC/ lift-tensor Lifting theorems for tensor functors on module categories  

E-print Network

May 27, 2010 18:1 WSPC/ lift-tensor Lifting theorems for tensor functors on module categories between them and Applegate's lifting theorem of functors between categories to related (co; lifting of functors; distributive laws. 2010 Mathematics Subject Classification: 16D90, 16S35, 16S40

Wisbauer, Robert

280

Duurzaamheid in de lift: traplopen Naar verluid gebruikt de gemiddelde lift in Nederland zo'n 4.800  

E-print Network

Duurzaamheid in de lift: traplopen Naar verluid gebruikt de gemiddelde lift in Nederland zo'n 4 veel studenten de lift gebruiken voor de reis van de begane grond naar de eerste of tweede verdieping, zo bleek uit de brainstorm 'projecten' die op 3 december plaatsvond. In rustige perioden moet de lift

Utrecht, Universiteit

281

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

282

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. PMID:21258593

2010-01-01

283

Project Plan for Vertical Lift Machine  

SciTech Connect

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 single linear axis positioning device capable of lifting objects vertically at controlled rates and positioning them repeatedly at predetermined heights, in relation to other objects suspended from above, for high neutron multiplication experiments. Operation of the machine during the experiments is done remotely. The lift mechanism shall accommodate various platforms (tables) that support the objects to be raised. A frame will support additional subassemblies from above such that the lower subassembly can be raised close to and/or interface with those above. The structure must be stiff and motion of the table linear such that radial alignment is maintained (e.g. concentricity). The safe position for the Vertical Lift Machine is the lift mechanism fully retracted with the subassemblies fully separated. The machine shall reside in this position when not in use. It must return to this safe condition from any position upon failure of power sources, open safety interlocks, or operator initiated SCRAM. The Vertical Lift Machine shall have the capability of return to the safe position with no externally applied power. The Vertical Lift Machine shall have dual operator interfaces, one near the machine and another located in a remote control room. Conventional single key, key-lock switching shall be implemented to lock out the control interface not in use. The interface at the machine will be used for testing and ''dry running'' experimental setup(s) with inert subassemblies (i.e. Setup Mode). The remote interface shall provide full control and data recording capability (i.e. Assembly Mode). The control system will be a combination of Programmable Logic Controller (PLC), or equivalent, and relay logic. The operator shall have the ability to adjust lift/lower velocity and position of the table. All measurements will be made as close to, and in line with, the axis of motion as practical. Measurement data, system parameter information, and interlock status shall be displayed.

Ellsworth, G F

2002-08-05

284

Occupational health in the People's Republic of China.  

PubMed Central

China's drive to modernize its economy will produce new occupational health problems even as it resolves earlier ones. Well aware of this, Chinese occupational health experts are intensifying efforts to improve workers' health and establish a modern occupational health program. Occupational lung disease, occupational cancer, heavy metal poisoning, industrial chemical poisoning, and physical factor-induced diseases (noise and heat) have all been targeted for expanded research which will serve as a basis for standard setting. Hazard control efforts include engineering controls, particularly in new construction, limited use of personal protective equipment, and expansion of environmental and medical monitoring. Worker education and professional activities have been expanded. International exchanges have been initiated and will prove occupational health a promising area of scientific cooperation. PMID:6228153

Christiani, D C

1984-01-01

285

Occupational Health, & Environment  

E-print Network

Occupational Health, Safety & Environment Information Session & Environment #12;· Getting to know the premises, W-hoog & W-laag · What to do in case of emergency · Information about Occupational Health, Safety Occupational Health, Safety and Environmental issues #12;Premises of Whoog and Wlaag Technical Engineering

Franssen, Michael

286

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.

287

Debbie Rand Department of Occupational  

E-print Network

Debbie Rand Department of Occupational Therapy University of Haifa Haifa, Israel Rachel Kizony Department of Occupational Therapy University of Haifa Haifa, Israel & School of Occupational Therapy Hadassah-Hebrew University Jerusalem, Israel Uri Feintuch School of Occupational Therapy Hadassah

Rizzo, Albert "Skip"

288

Noise impact of advanced high lift systems  

NASA Technical Reports Server (NTRS)

The impact of advanced high lift systems on aircraft size, performance, direct operating cost and noise were evaluated for short-to-medium and medium-to-long range aircraft with high bypass ratio and very high bypass ratio engines. The benefit of advanced high lift systems in reducing noise was found to be less than 1 effective-perceived-noise decibel level (EPNdB) when the aircraft were sized to minimize takeoff gross weight. These aircraft did, however, have smaller wings and lower engine thrusts for the same mission than aircraft with conventional high lift systems. When the advanced high lift system was implemented without reducing wing size and simultaneously using lower flap angles that provide higher L/D at approach a cumulative noise reduction of as much as 4 EPNdB was obtained. Comparison of aircraft configurations that have similar approach speeds showed cumulative noise reduction of 2.6 EPNdB that is purely the result of incorporating advanced high lift system in the aircraft design.

Elmer, Kevin R.; Joshi, Mahendra C.

1995-01-01

289

Design of a Versatile, Teleoperable, Towable Lifting Machine with Robotic Capabilities for Use in Nasa's Lunar Base Operations  

NASA Technical Reports Server (NTRS)

The lifting machine will assist in lifting cargo off of landers sent to the Moon and in the construction of a lunar base. Three possible designs were considered for the overall configuration of the lifting machine: the variable angle crane, the tower crane, and the gantry crane. Alternate designs were developed for the major components of the lifting machine. A teleoperable, variable angle crane was chosen as its final design. The design consists of a telescoping boom mounted to a chassis that is supported by two conical wheels for towing and four outriggers for stability. Attached to the end of the boom is a seven degree of freedom robot arm for light, dexterous, lifting operations. A cable and hook suspends from the end of the boom for heavy, gross, lifting operations. Approximate structural sizes were determined for the lifter and its components. However, further analysis is needed to determine the optimum design dimensions. The design team also constructed a model of the design which demonstrates its features and operating principals.

Harris, Elizabeth; Ogle, James; Schoppe, Dean

1989-01-01

290

Occupational contact dermatitis.  

PubMed

The dermatologist should be aware of the many facets of occupational skin diseases, which can be caused by physical, chemical, and biological insults. The most common manifestation of occupational skin diseases is contact dermatitis (both irritant and allergic). Three factors point out the importance of occupational skin diseases as diseases that have a public health impact: 1) occupational skin diseases are common; 2) they often have a poor prognosis; and 3) they result in a noteworthy economic impact for society and for an individual. They are also diseases amenable to public health interventions. Specific industries and exposures may put a worker at risk of occupational contact dermatitis. The accuracy of the diagnosis of occupational contact dermatitis is related to the skill level, experience, and knowledge of the medical professional who makes the diagnosis and confirms the relationship with a workplace exposure. Prevention of occupational contact dermatitis is important, and a variety of prevention strategies are available. PMID:15186373

Lushniak, Boris D

2004-01-01

291

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.

292

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.

293

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. 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

294

Unsteady lifting-line theory with applications  

NASA Technical Reports Server (NTRS)

Unsteady lifting-line theory is developed for a flexible unswept wing of large aspect ratio oscillating at low frequency in inviscid incompressible flow. The theory is formulated in terms of the acceleration potential and treated by the method of matched asymptotic expansions. The wing displacements are prescribed and the pressure field, airloads, and unsteady induced downwash are obtained in closed form. Sample numerical calculations are presented. The present work identifies and resolves errors in the unsteady lifting-line theory of James and points out a limitation in that of Van Holten. Comparison of the results of Reissner's approximate unsteady lifting-surface theory with those of the present work shows favorable agreement. The present work thus provides some formal justification for Reissner's ad hoc theory. For engineering purposes, the region of applicability of the theory in the reduced frequency-aspect ratio domain is identified approximately and found to cover most cases of practical interest.

Ahmadi, A. R.; Widnall, S. E.

1982-01-01

295

Frequency response of lift control in Drosophila.  

PubMed

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. PMID:20462877

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

2010-11-01

296

Lift and Drag of Wings with Small Span  

NASA Technical Reports Server (NTRS)

The lift coefficient of!a wing of small span at first shows a linear increase for the increasing angle of attack, but to a lesser degree then was to be expected according to the theory of the lifting line; thereafter the lift coefficient increases more rapidly than linearity, as contrasted with the the theory of the lifting line. The induced drag coefficient for a given lift coefficient, on the other hand, is obviously much smaller than it would be according to the theory. A mall change in the theory of the lifting line will cover these deviations.

Weinig, F.

1947-01-01

297

Physiological responses of women during lifting exercise  

Microsoft Academic Search

Summary  Physiological responses were measured in 7 women subjects who lifted boxes weighing 6.8, 15.9 or 22.7 kg from the floor to a height of 60 cm. After training and establishing the\\u000a$$\\\\dot V$$\\u000aO2 max, the boxes were lifted for 1 h at 30, 50, and 60%\\u000a$$\\\\dot V$$\\u000aO2 max. The changes in heart rate,\\u000a$$\\\\dot V$$\\u000aO2, the

C. A. Williams; J. S. Petrofsky; A. R. Lind

1982-01-01

298

Drag induced lift in granular media  

E-print Network

Laboratory experiments and numerical simulation reveal that a submerged intruder dragged horizontally at constant velocity within a granular medium experiences a lift force whose sign and magnitude depend on the intruder shape. Comparing the stress on a flat plate at varied inclination angle with the local surface stress on the intruders at regions with the same orientation demonstrates that intruder lift forces are well approximated as the sum of contributions from flat-plate elements. The plate stress is deduced from the force balance on the flowing media near the plate.

Yang Ding; Nick Gravish; Daniel I. Goldman

2010-11-17

299

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. PMID:15531427

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

2004-01-01

300

Comparison of Lifting-line and Lifting-surface Blade Models for Rotor Wakes  

NASA Astrophysics Data System (ADS)

Rotor blades are often modeled using either the lifting-line or the lifting-surface approach. Classical lifting-line theory treats the case of a high aspect ratio blade where the blade is modeled by just a bound vortex line. The tip-vortex and the trailing vortex sheet are shed from the bound vortex line. The lifting-line approach will thus be expected to be accurate for large aspect ratio wings and blades. In the lifting-surface approach the blade is modeled by a thin lifting surface to more precisely understand the aerodynamic behavior of the chordwise flow close to the blade surface and its effect on the formation of the tip-vortex and consequently the entire wake. Due to the presence of a finite chord, this model seems to be more robust as far as chordwise changes in flow patterns are concerned. The objective of the present work is to compare results from two distinct vortex-wake models. The Wake Model with Lifting-Line has a robust model for the wake. The Lifting-Surface Model with Wake Effects has a robust model for the lifting-surface with additional terms in the governing equations representing a simplified model for the wake. Bound and tip-vortex strengths, tip-vortex trajectories and velocity profiles are evaluated using these models very close to the blade. It is observed that the results obtained from these models are comparable. The minor discrepancies observed are explained in terms of the assumptions made. To establish the validity of the models the results are also compared with experimental data. Sponsored by the Rotorcraft Center of Excellence at Georgia Institute of Technology and the Army Research Office.

Kini, Santosh; Godavarty, Vishwanath; Conlisk, A. T.

2001-11-01

301

The lift-fan powered-lift aircraft concept: Lessons learned  

NASA Technical Reports Server (NTRS)

This is one of a series of reports on the lessons learned from past research related to lift-fan aircraft concepts. An extensive review is presented of the many lift-fan aircraft design studies conducted by both government and industry over the past 45 years. Mission applications and design integration including discussions on manifolding hot gas generators, hot gas dusting, and energy transfer control are addressed. Past lift-fan evaluations of the Avrocar are discussed. Lessons learned from these past efforts are identified.

Deckert, Wallace H.

1993-01-01

302

Department of Occupational Science and Occupational Therapy Faculty of Medicine  

E-print Network

1 Department of Occupational Science and Occupational Therapy Faculty of Medicine Master of Science in Occupational Therapy GRADUATE STUDENT HANDBOOK 2013-2014 Revision: October 2013 Information in this Handbook to welcome you to the MScOT program in the Department of Occupational Science and Occupational Therapy

Sokolowski, Marla

303

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

304

Design of a Thermally-Actuated Gas Lift Safety Valve  

E-print Network

Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valve assemblies (GLV). One failure mode occurs when the GLV check valve fails and product passes into the well annulus, potentially reaching ...

Gilbertson, Eric W.

305

View southeast; west side of lift bridge with reserve basin ...  

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

View southeast; west side of lift bridge with reserve basin in background. - Naval Base Philadelphia-Philadelphia Naval Shipyard, Lift Bridge, Mouth of Reserve Basin, League Island, Philadelphia, Philadelphia County, PA

306

View southwest; general context of lift bridge from ships in ...  

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

View southwest; general context of lift bridge from ships in reserve basin. - Naval Base Philadelphia-Philadelphia Naval Shipyard, Lift Bridge, Mouth of Reserve Basin, League Island, Philadelphia, Philadelphia County, PA

307

A New Representation of Lifted Systems with Applications Leonid Mirkin  

E-print Network

(compu- tational issues in sampled-data H2 and H control and Riccati equations for lifted systems) controller in the lifted domain has a finite state dimension. Thus, analytic solutions to various sampled

Mirkin, Leonid

308

Design of an electronically-actuated gas lift safety valve  

E-print Network

Gas lift valves are widely used in oil production fields to pump recycled gas and nitrogen into the production tubing, to sustain production by aerating the oil and lifting it to the ground or sea surface. Today's industry ...

Yu, Changkuan, S.M. Massachusetts Institute of Technology

2013-01-01

309

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

310

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

311

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

312

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

313

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

314

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

315

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

316

Failure Mode and Sensitivity Analysis of Gas Lift Valves  

E-print Network

Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valves. This is a growing concern as offshore wells are drilled thousands of meters below the ocean floor in extreme temperature and pressure ...

Gilbertson, Eric W.

317

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

318

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

319

Lifted Probabilistic Inference Kristian Kersting1  

E-print Network

to the emerging field of lifted probabilistic inference, inference techniques that exploit these symmetries and rhyme schemes of poetry as well as in the patterns of steps when dancing. Symmetric faces are even said2 , "at the heart of relativity the- ory, quantum mechanics, string theory, and much of modern

Kersting, Kristian

320

[Video-assisted endoscopic lifting: development].  

PubMed

Now the Endoscope is used differently in video-assisted Face-lifts. Authors describe their evolution for 2 years and a half. In the beginning. It was used to correct glabellar frowns. Then, the endoscope served to elevate the forehead by a subperiosteal approach. Sometime it was combined with a subperiosteal malar dissection in an Endoscopic full face-lift. Bad results on the eyebrows and eyelids complications involved the authors to modify their strategy: By changing the dynamic of muscles: lateral section of the orbicularis occuli muscle arises the frontal muscle to definitely lift up the eyebrow: this is called the "myotomy box"; by preferring a subgaleal, retro-orbicularis dissection, under the malar fat pad and the platysma muscle in a deep plane but always above the zygomaticus major muscle, protector of the facial nerve in the buccal space; by developing new endodissectors efficient and less aggressive to spread the deep planes without damage; by an acute control of the fronto-temporal and cervico-facial deep dissection using new endoscopic valves; by treating precise damaged areas with Limited Endoscopic Face-Lifts in a same harmonious deep dissection instead of large multiplanar underminnings. PMID:9206308

Raspaldo, H

1997-01-01

321

Autoprosthesis Buttock Augmentation During Lower Body Lift  

Microsoft Academic Search

With the increasing popularity of bariatric surgery, patients with multiple body contour deformities have become more common in plastic surgery practice. Most of the deformities involving the abdomen, thighs, and buttocks can be effectively corrected with belt lipectomy and lower body lift. A common problem with this procedure is postoperative loss of gluteal projection and resulting flattened buttock contour, which

Sadri O. Sozer; Francisco J. Agullo; Coty Wolf

2005-01-01

322

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 weights…

Heavers, Richard M.; Soleymanloo, Arianne

2011-01-01

323

Evolution of curvature invariants and lifting integrability  

E-print Network

Evolution of curvature invariants and lifting integrability Elizabeth L. Mansfield and Peter H. van. These define the curvature and evolution invariants that are associated to curves moving in the given geometry. The syzygy between the curvature and evolution invariants is obtained as a zero curvature relation

Kamp, Peter H. van der

324

High-order lifting and integrality certification  

Microsoft Academic Search

Reductions to polynomial matrix multiplication are given for some classical problems involving a nonsingular input matrix over the ring of univariate polynomials with coefficients from a field. High-order lifting is used to compute the determinant, the Smith form, and a rational system solution with about the same number of field operations as required to multiply together two matrices having the

Arne Storjohann

2003-01-01

325

Lifts of Convex Sets and Cone Factorizations  

E-print Network

In this paper, we address the basic geometric question of when a given convex set is the image under a linear map of an affine slice of a given closed convex cone. Such a representation or lift of the convex set is especially ...

Parrilo, Pablo A.

326

LIFTED INEQUALITIES FOR A SOFTDRINK LOTSCHEDULING MODEL  

E-print Network

of the West of England - UWE - Department of Engineering Design and Mathematics e-mail: alistair derived using a lifting procedure into a lot scheduling model applied to the soft-drink production;1 Introduction The development of a formulation that approximates the convex hull of a set of feasible points can

Clark, Alistair

327

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. PMID:10350509

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

1999-01-01

328

Analysis of lifting beam and redesigned lifting lugs for 241-AZ-01A decant pump  

SciTech Connect

This supporting document details calculations for the proper design of a lifting beam and redesigned lifting lugs for the 241AZO1A decant pump. This design is in accordance with Standard Architectural-Civil Design Criteria, Design Loads for Facilities (DOE-RL 1989) and is safety class three. The design and fabrication is in accordance with American Institute of Steel Construction, Manual of Steel Construction, (AISC, 1989) and the Hanford Hoisting and Rigging Manual (DOE-RL 1993).

Coverdell, B.L.

1994-11-29

329

Graduate Diploma in Occupational Safety &  

E-print Network

Graduate Diploma in Occupational Safety & Health/MSc in Occupational Safety & Health UCD School in Occupational Safety and Health (OSH), who have not previously achieved a higher qualification in OSH · Occupational Health · Occupational Hygiene · Risk Assessment and Safety Statement · Human and Organisational

330

A dynamic analysis of spinal compression with different lifting techniques  

Microsoft Academic Search

Although it is commonly assumed that lifting with flexed knees and the trunk erect will lead to reduced compressive force on the low back, the benefits are only realized when the load can be lifted between the knees, i.e. close to the body. Moreover, the assumption has often been based solely on an analysis of the initial lifting posture, ignoring

T. P. J. LESKINEN; H. R. STĹLHAMMAR; I. A. A. KUORINKA; J. D. G. TROUP

1983-01-01

331

Radical face lift surgery: A plea for caution  

Microsoft Academic Search

Radical face lift procedures, such as midface lifts and deep-plane or composite face lifts, increase the potential for complications and increase morbidity. Although a small percentage of patients may require these radical techniques to achieve optimal results, there is no evidence that radical procedures produce better or longer-lasting improvement in the vast majority of patients than properly performed standard methods.

Simon Fredricks

2002-01-01

332

14 CFR 25.345 - High lift devices.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false High lift devices. 25.345 Section 25...and Gust Conditions § 25.345 High lift devices. (a) If wing...EAS). (c) If flaps or other high lift devices are to be used in en...

2012-01-01

333

AIAA 2003-3957 Optimization of High-Lift  

E-print Network

AIAA 2003-3957 Optimization of High-Lift Configurations Using a Newton­Krylov Algorithm Marian, VA, 20191-4344. #12;Optimization of High-Lift Configurations Using a Newton­Krylov Algorithm Marian examples reveal a number of difficulties for numerical optimization methods when applied to high-lift

Zingg, David W.

334

14 CFR 25.345 - High lift devices.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false High lift devices. 25.345 Section 25...and Gust Conditions § 25.345 High lift devices. (a) If wing...EAS). (c) If flaps or other high lift devices are to be used in en...

2013-01-01

335

Lifted First-Order Belief Propagation Parag Singla Pedro Domingos  

E-print Network

Lifted First-Order Belief Propagation Parag Singla Pedro Domingos Department of Computer Science inference methods to the resulting net- work. Ideally, inference should be lifted as in first-order logic. Poole (2003) and Braz et al. (2005, 2006) developed a lifted version of the variable elimination

Prasad, Sanjiva

336

Stabilization of Gas-Lift Wells by Feedback Control  

E-print Network

Stabilization of Gas-Lift Wells by Feedback Control Gisle Otto Eikrem A DISSERTATION SUBMITTED Stabilization of casing-heading instability from gas-lift wells is important since it increases production and reduces operational problems. This thesis is a contribution within feedback control stabilization of gas-lift

Foss, Bjarne A.

337

On optimizing over lift-and-project closures Pierre Bonami  

E-print Network

On optimizing over lift-and-project closures Pierre Bonami Laboratoire d'Informatique Fondamentale, CNRS/Aix Marseille Universit´e, Marseille, France October 27, 2010 Abstract The lift-and-project closure is the relaxation obtained by computing all lift-and-project cuts from the initial formulation

Paris-Sud XI, Université de

338

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Lift and drag device indicator. 25.699...Construction Control Systems § 25.699 Lift and drag device indicator. (a) There...indicate to the pilots the position of each lift or drag device having a separate...

2010-01-01

339

Random Lifts of Graphs III: Independence and Chromatic Number  

E-print Network

Random Lifts of Graphs III: Independence and Chromatic Number Alon Amit #3; Nathan Linial y Ji#20;r#19;#16; Matou#20;sek z May 23, 2001 Abstract For a graph G, a random n-lift of G has the vertex set V lifts, with G #12;xed and n ! 1. For the independence number, upper and lower bounds are obtained

Linial, Nathan "Nati"

340

49 CFR 37.165 - Lift and securement use.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Lift and securement use. 37.165 Section... Provision of Service § 37.165 Lift and securement use. Link to an amendment...the use of securement systems, ramps and lifts. If it is necessary for the...

2011-10-01

341

LiFTinG: Lightweight Freerider-Tracking in Gossip  

E-print Network

LiFTinG: Lightweight Freerider-Tracking in Gossip Rachid Guerraoui1 , K´evin Huguenin2 , Anne / Universit´e of Rennes 1 3 INRIA Rennes-Bretagne Atlantique 4 IIT Guwahati Abstract. This paper presents LiFTinG systems with asymmetric data exchanges. LiFTinG relies on nodes tracking abnormal behaviors by cross

Paris-Sud XI, Université de

342

Distinguished Liftings and the Andre-Oort Florian Breuer  

E-print Network

Distinguished Liftings and the Andr´e-Oort Conjecture Florian Breuer December 2002 Contents 1 Introduction 1 2 Applying linear algebra 3 3 The Andr´e-Oort conjecture 5 4 Lifting modular varieties 7 5 the points of An (Fp). Conversely, every point in An (Fp) has many lifts to An (Q). For some of these points

Breuer, Florian

343

49 CFR 37.165 - Lift and securement use.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Lift and securement use. 37.165 Section... Provision of Service § 37.165 Lift and securement use. (a) This section...the use of securement systems, ramps and lifts. If it is necessary for the...

2010-10-01

344

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

345

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Lift and drag device indicator. 25.699...Construction Control Systems § 25.699 Lift and drag device indicator. (a) There...indicate to the pilots the position of each lift or drag device having a separate...

2012-01-01

346

On Lifting the Gibbs Sampling Algorithm Deepak Venugopal  

E-print Network

On Lifting the Gibbs Sampling Algorithm Deepak Venugopal Department of Computer Science uncertainty. Lifted probabilistic inference algorithms for them have been the subject of much recent research blocked Gibbs sampling, an advanced MCMC scheme, and lift it to the first-order level. We propose

Gogate, Vibhav

347

21 CFR 880.5500 - AC-powered patient lift.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false AC-powered patient lift. 880.5500 Section 880.5500 Food and...Devices § 880.5500 AC-powered patient lift. (a) Identification. An AC-powered lift is an electrically powered device either...

2010-04-01

348

LIFTS, DERANDOMIZATION, AND DIAMETERS OF SCHREIER GRAPHS OF MEALY AUTOMATA  

E-print Network

LIFTS, DERANDOMIZATION, AND DIAMETERS OF SCHREIER GRAPHS OF MEALY AUTOMATA ANTON MALYSHEV AND IGOR PAK Abstract. It is known that random 2-lifts of graphs give rise to expander graphs. We present a new], Bilu and Linial showed that random 2-lifts of expanding graphs remain expanding with high probability

Pak, Igor

349

INDUCED LIFTINGS, EXCHANGE RINGS AND SEMI-PERFECT ALGEBRAS  

E-print Network

INDUCED LIFTINGS, EXCHANGE RINGS AND SEMI-PERFECT ALGEBRAS Petar Pavesi´c Fakulteta za Matematiko Several important classes of rings can be characterized in terms of liftings of idempo- tents with respect begin with a study of some extensions of the concept of idempotent-lifting and prove generalizations

Pavesic, Petar

350

21 CFR 880.5500 - AC-powered patient lift.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false AC-powered patient lift. 880.5500 Section 880.5500 Food and...Devices § 880.5500 AC-powered patient lift. (a) Identification. An AC-powered lift is an electrically powered device either...

2011-04-01

351

14 CFR 23.369 - Rear lift truss.  

Code of Federal Regulations, 2011 CFR

... 2011-01-01 2011-01-01 false Rear lift truss. 23.369 Section 23.369 Aeronautics...AIRPLANES Structure Flight Loads § 23.369 Rear lift truss. (a) If a rear lift truss is used, it must be designed to...

2011-01-01

352

Lifted Inference Seen from the Other Side : The Tractable Features  

E-print Network

Lifted Inference Seen from the Other Side : The Tractable Features Abhay Jha Vibhav Gogate {abhaykj,vgogate,ameli,suciu}@cs.washington.edu Abstract Lifted Inference algorithms for representations that combine first-order logic and graphical models have been the focus of much recent research. All lifted

Berger, Emery

353

21 CFR 880.5500 - AC-powered patient lift.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false AC-powered patient lift. 880.5500 Section 880.5500 Food and...Devices § 880.5500 AC-powered patient lift. (a) Identification. An AC-powered lift is an electrically powered device either...

2012-04-01

354

The lifting of polynomial traces revisited Christine Bernardi1  

E-print Network

The lifting of polynomial traces revisited Christine Bernardi1 , Monique Dauge2 , and Yvon Maday1 Abstract We construct a lifting operator of polynomial traces on an interval that is stable in appropriate whole boundary or parts of it. They are also the natural measures for deriving stable liftings

Paris-Sud XI, Université de

355

Lifting mod p representations to characteristics p2 Gebhard Bockle  

E-print Network

Lifting mod p representations to characteristics p2 Gebhard B¨ockle ETH Z¨urich, Departement. As a first step in this direction, we consider the problem of finding lifts to characteristic p2 field and n any positive integer. If K is a local field, we can show that such lifts always exist

Böckle, Gebhard

356

Lifting distributions to tangent and jet bundles Andrew D. Lewis  

E-print Network

Lifting distributions to tangent and jet bundles Andrew D. Lewis 19/05/1998 Last updated: 17/08/2001 Abstract Two natural means are provided to lift a distribution from a manifold to its tangent bundle might ask for a "lifted" distribution on TM. For example, three possible natural properties are: L1

Lewis, Andrew D.

357

Unsteady Lift Suppression with a Robust Closed Loop Controller  

E-print Network

Unsteady Lift Suppression with a Robust Closed Loop Controller David Williams1 , Wesley Kerstens1 to control lift in unsteady flows using active flow control is examined experimentally with a three lift force on the wing. A `black box' model of the wing response to actuation is obtained using

Dabiri, John O.

358

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...AIRPLANES Structure Flight Loads § 23.369 Rear lift truss. (a) If a rear lift truss is used, it must be designed to...

2010-01-01

359

14 CFR 25.699 - Lift and drag device indicator.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 2011-01-01 false Lift and drag device indicator. 25.699...Construction Control Systems § 25.699 Lift and drag device indicator. (a) There...indicate to the pilots the position of each lift or drag device having a separate...

2011-01-01

360

14 CFR 23.369 - Rear lift truss.  

Code of Federal Regulations, 2012 CFR

... 2012-01-01 2012-01-01 false Rear lift truss. 23.369 Section 23.369 Aeronautics...AIRPLANES Structure Flight Loads § 23.369 Rear lift truss. (a) If a rear lift truss is used, it must be designed to...

2012-01-01

361

Decorrelating Medical Image Sets with Lifting: A New Approach  

Microsoft Academic Search

Abstract - In recent years, wavelet lifting is widely used in digital image processing. Different lifting schemes decorrelate digital medical image sets differently. The difference is due to the properties of the lifting schemes and the way the image data is processed by these schemes. Each medical image has a foreground (the medical data) surrounded,by background. The background,is not used

Rahman Tashakkori; John M. Tyler; Oleg S. Pianykh; Xiaojun Qi

2004-01-01

362

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

363

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

364

The UBC Department of Occupational Science & Occupational Therapy  

E-print Network

The UBC Department of Occupational Science & Occupational Therapy in conjunction with Celebrate Learning Week presents a Conversations on Occupation Café Wednesday,November 2,2011 from 7:30 to 9:30 pm

Handy, Todd C.

365

Texas passes first law for safe patient handling in America: landmark legislation protects health-care workers and patients from injury related to manual patient lifting.  

PubMed

On June 17,2005, Texas Governor Rick Perry (R) signed into law Senate Bill 1525, making Texas the first state in the nation to require hospitals and nursing homes to implement safe patient handling and movement programs. Governor Perry is to be commended for this heroic first stand for safe patient handling in America. The landmark legislation will take effect January 1, 2006, requiring the establishment of policy to identify, assess, and develop methods of controlling the risk of injury to patients and nurses associated with lifting, transferring, repositioning, and movement of patients; evaluation of alternative methods from manual lifting to reduce the risk of injury from patient lifting, including equipment and patient care environment; restricting, to the extent feasible with existing equipment, manual handling of all or most of a patient's weight to emergency, life-threatening, or exceptional circumstances; and provision for refusal to perform patient handling tasks believed to involve unacceptable risks of injury to a patient or nurse. Manually lifting patients has been called deplorable, inefficient, dangerous to nurses, and painful and brutal to patients; manual lifting can cause needless suffering and injury to patients, with dangers including pain, bruising, skin tears, abrasions, tube dislodgement, dislocations, fractures, and being dropped by nursing staff during attempts to manually lift. Use of safe, secure, mechanical lift equipment and gentle friction-reducing devices for patient maneuvering tasks could eliminate such needless brutality. Research has proven that manual patient lifting is extremely hazardous to health-care workers, creating substantial risk of low-back injury, whether with one or two patient handlers. Studies on the use of mechanical patient lift equipment, by either nursing staff or lift teams, have proven repeatedly that most nursing staff back injury is preventable, leading to substantial savings to employers on medical and compensation costs. Because the health-care industry has relied on people to do the work of machines, nursing work remains the most dangerous occupation for disabling back injury. Back injury from patient lifting may be the single largest contributor to the nursing shortage, with perhaps 12% of nurses leaving or being terminated because of back injury. The US health-care industry has not kept pace with other industries, which provide mechanical lift equipment for lifting loads equivalent to the weight of patients, or with other countries, such as Australia and England, which are more advanced in their use of modern technology for patient lifting and with no-lifting practices in compliance with government regulations and nursing policies banning manual lifting. With Texas being the first state to succeed in passing legislation for safe patient handling, other states are working toward legislative protection against injury with manual patient lifting. California re-introduced safe patient handling legislation on February 17, 2005, with CA SB 363, Hospitals: Lift Teams, following the September 22, 2004, veto of CA AB 2532 by Governor Arnold Schwarzenegger, who said he believes existing statutory protection and workplace safety standards are sufficient to protect health care workers from injury. Massachusetts HB 2662, Relating to Safe Patient Handling in Certain Health Facilities, was introduced December 1, 2004. Ohio HB 67, signed March 21, 2005 by Governor Bob Taft (R), creates a program for interest-free loans to nursing homes for implementation of a no-manual-lift program. New York companion bills AB 7641 and SB 4029 were introduced in April, 2005, calling for creation of a 2-year study to establish safe patient handling programs and collect data on nursing staff and patient injury with manual patient handling versus lift equipment, to determine best practices for improving health and safety of health-care workers and patients during patient handling. Washington State is planning re-introduction of safe patient handling legislation, after WA HB 1672, Relating to red

Hudson, Mary Anne

2005-01-01

366

Liposuction-Assisted Medial Thigh Lift in Obese and Non Obese Patients  

PubMed Central

Introduction: The abdomen, thighs and buttocks are often the areas of greatest concern to patients following massive weight loss due to bariatric surgery. The typical appearance of the patient who has lost a massive amount of weight derives from a combination of factors, including gender-dependent body morphology and a change in body mass index, which lead to skin and soft-tissue excess and poor skin tone. Thigh laxity and redundancy represents a great challenge to both patients and surgeons. Not only because of the difficulty to satisfy the patients, but also due to the higher incidence of complications especially, with those obese patients who have not undergone bariatric surgery before. The problems with such patients are due to the heavy thighs that require both debulking and tight anchorage to prevent scar migration or labial distortion. Aim of the Work: The aim of the present study is to improve the aesthetic outcome and avoid the complications of medial thigh lifting with simultaneous liposuction in obese and non-obese. Patients and Methods: A total of 25 female patients presented during the period from January 2007 to July 2011 complaining of moderate to severe thigh laxity with or without lipodystrophy. In 20 patients medial transverse thigh lift was performed, to treat medial thigh friction and laxity particularly in the upper half. Whereas, in the other five patients were suffering from upper and lower medial thigh bulkiness, vertical thigh lift was performed. Results: All patients recovered well in 2 weeks and showed improvement of thigh contour. Scar downward displacement in one patient. No skin necrosis or seroma. No labial distortion or separation encountered. Conclusion: Simultaneous liposuction and thigh lift gave good results provided proper patients selection, appropriate technique to each patient, meticulous, cautious liposuction and handling of the tissues and most importantly is the deep tight anchorage sutures to guard against the effect of heavy skin flaps. PMID:24470720

Aboueldahab, Abdelmohsen Khalaf

2013-01-01

367

Occupational activities and osteoarthritis of the knee  

PubMed Central

Background The prevalence of knee osteoarthritis (OA) is rising and the search for interventions to mitigate risk is intensifying. This review considers the contribution of occupational activities to disease occurrence and the lessons for prevention. Sources Systematic search in Embase and Medline covering the period 1996 to November 2011. Areas of agreement Reasonably good evidence exists that physical work activities (especially kneeling, squatting, lifting, and climbing) can cause and/or aggravate knee OA. These exposures should be reduced where possible. Obese workers with such exposures are at additional risk of knee OA and should therefore particularly be encouraged to lose weight. Areas of uncertainty/research need Workplace interventions and policies to prevent knee OA have seldom been evaluated. Moreover, their implementation can be problematic. However, the need for research to optimise the design of work in relation to knee OA is pressing, given population trends towards extended working life. PMID:22544778

Palmer, Keith T

2012-01-01

368

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 science,…

Geneva Area City Schools, OH.

369

[Hand and occupational diseases].  

PubMed

Hand is frequently the site of work accidents or occupational diseases. The musculoskeletal upper limb is the first recognized occupational disease and carpal tunnel syndrome is the most common of them. The most common location of occupational dermatoses is the hand. Their causes are often multifactorial, involving chemical irritants, physical, allergens and endogenous factors (mainly atopic dermatitis). Occupational exposure to microtrauma and iterative use of vibrating tools may also be the cause of hypothenar hammer syndrome and acrosyndromes. The frequent chronicity and functional impairment induced by these attacks can cause lasting disabilities, an inability to source workstation. Occupational physician is a focal point for helping to maintain the position and the prevention of socioprofessional disinsertion. Many pathologies of the hand related to professional activity may benefit from a statement in occupational disease and thus allow the patient to obtain compensation and employment protection. Prevention of occupational hand diseases should be made by all health actors, especially in occupations and industries at risk. PMID:24134812

Bensefa-Colas, Lynda; Choudat, Dominique

2013-12-01

370

Occupational Health Manual.  

ERIC Educational Resources Information Center

This manual is designed to be used for "Administrative Aspects of Occupational Medicine," one of two officer correspondence courses offered by the Naval Medical Training Institute. Part one comprises guidelines for setting up occupational health clinics, covering the areas of staffing, layout, equipment, other services, and records maintenance.…

Naval Medical Training Inst., Bethesda, MD.

371

Occupational asthma: a review.  

PubMed Central

Occupational asthma is the most common form of occupational lung disease in the developed world at the present time. In this review, the epidemiology, pathogenesis/mechanisms, clinical presentations, management, and prevention of occupational asthma are discussed. The population attributable risk of asthma due to occupational exposures is considerable. Current understanding of the mechanisms by which many agents cause occupational asthma is limited, especially for low-molecular-weight sensitizers and irritants. The diagnosis of occupational asthma is generally established on the basis of a suggestive history of a temporal association between exposure and the onset of symptoms and objective evidence that these symptoms are related to airflow limitation. Early diagnosis, elimination of exposure to the responsible agent, and early use of inhaled steroids may play important roles in the prevention of long-term persistence of asthma. Persistent occupational asthma is often associated with substantial disability and consequent impacts on income and quality of life. Prevention of new cases is the best approach to reducing the burden of asthma attributable to occupational exposures. Future research needs are identified. PMID:10931788

Lombardo, L J; Balmes, J R

2000-01-01

372

The Heath Occupational Model.  

ERIC Educational Resources Information Center

Career development programs must identify occupational needs of adults. A model based on Maslow's hierarchy develops occupational questions related to individual motivations (physiology, safety, love, esteem, and self-actualization). Individual needs are then compared with characteristics and benefits of proposed jobs, companies, or careers. (SK)

Heath, William E.

1990-01-01

373

Dementia and occupational therapy  

Microsoft Academic Search

In order to evaluate the efficacy of the occupational therapy in patients with dementia, we included in the occupational therapy (OT) program 34 patients with dementia and a moderate to severe cognitive impairment admitted at our RSA. Fourteen of them had vascular dementia (VD), twenty had Alzheimer dementia (AD). For a period of 40 days they followed a daily therapeutic

M. V. Baldelli; R. Boiardi; P. Ferrari; S. Bianchi; M. Hunscott Bianchi

2007-01-01

374

LIFTS OF PROJECTIVE CONGRUENCE GROUPS, II Abstract. We continue and complete our previous paper `Lifts of projective  

E-print Network

LIFTS OF PROJECTIVE CONGRUENCE GROUPS, II IAN KIMING Abstract. We continue and complete our previous paper `Lifts of projective congruence groups' [2] concerning the question of whether there exist by the image of in PSL2(Z). For 1 a subgroup of SL2(Z) (of finite index) we say that 1 is a lift of if 1

Kiming, Ian

375

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. PMID:6219498

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

1982-01-01

376

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. PMID:21258592

Ahn, Yeon-Soon; Jeong, Jae Sim

2010-01-01

377

Occupational Disease in Connecticut, 2014  

E-print Network

...........................................................................................24 E. Occupational Disease Surveillance System: Physicians' Reports, as part of the Occupational Disease Surveillance Program, operated in cooperation with the ConnecticutOccupational Disease in Connecticut, 2014 This report covers data for 2012 and was prepared under

Oliver, Douglas L.

378

Reliability of the psychophysical approach to manual lifting of liquids by females  

Microsoft Academic Search

The psychophysical method for setting lifting standards was evaluated by having seven, female college students lift at four diiferent frequencies (1, 3, 6 and 12 lifts min). Only one lifting session was performed in a 24 hour period. During the 4 hour lifting task, subjects were asked to select the amount of water that they believed they could lift comfortably

WALDEMAR KARWOWSKI; J. W. YATES

1986-01-01

379

Prevention of occupational dermatitis.  

PubMed

Occupational dermatitis is among the most frequent occupational diseases. Dermal exposure risk affects many professional categories such as healthcare workers, hairdressers, bakers, cleaning and kitchen employees. The economical burden of occupational dermatitis (OD) is huge (greater than 5 billion Euro per year in Europe), comprising direct costs (treatment, compensation), as well as indirect costs due to sick leave and lack of productivity. A scientifically based preventive program consisting of skin protection during work, cleaning and skin care after work has generally been recommended to prevent occupational contact dermatitis. However the rate of reported occupational skin diseases seems unchanged in the recent years. In cases of impaired skin condition the secondary prevention (i.e. therapeutic treatment by dermatologists and health-educational intervention seminars) is fundamental. For cases of occupational dermatoses in which these outpatient prevention measures are not successful, interdisciplinary inpatient rehabilitation measures have been developed (tertiary individual prevention). In the past years, various pilot-concepts to improve occupational dermatitis prevention have been successfully put into practice focussing on interdisciplinary (dermatological and educational) skin protection training programmes for high-risk professions. Currently a multi-step intervention approach is implemented which is aiming at offering quick preventive help at all levels of severity of occupational contact dermatitis. Recent data reveals that there are reliable evidence-based options for multidisciplinary prevention and patient management of occupational dermatitis using a combined approach by a network of clinics, practices and statutory social insurance bodies. At this stage, it seemed reasonable to form a European joint initiative for skin prevention. Recently a European network of preventive dermatology (European Initiative for the Prevention of Occupational Skin Diseases-EPOS) has been organized based on the German experience in the specific field. PMID:21329572

Sartorelli, P; Kezic, S; Larese Filon, F; John, S M

2011-01-01

380

LBNL/ Fall Protection Requirements for Boom Lift 2010 Requirements for boom lift operations is to tether an adjustable 6' lanyard to 3ft  

E-print Network

LBNL/ Fall Protection Requirements for Boom Lift 2010 Requirements for boom lift operations is to tether an adjustable 6' lanyard to 3ft while operating a boom lift. While operating a JLG Aerial lift. LBNL best practices requirements for boom lift Operations is to tether an adjustable 6' lanyard to 3ft

Eisen, Michael

381

the Occupational Safety & Health Administration (OSHA) has the authority to conduct inspections of  

E-print Network

the Occupational Safety & Health Administration (OSHA) has the authority to conduct inspections of the agency's current enforcement-heavy philosophy. the Occupational Safety & Health Administration (OSHA and safety standards. As OSHA conducts virtually all of its litigation "discovery" during the on

Nizkorodov, Sergey

382

Lifted tensors and Hamilton-Jacobi separability  

NASA Astrophysics Data System (ADS)

Starting from a bundle ?:E?R, the bundle ?:J1???E, which is the dual of the first jet bundle J1? and a sub-bundle of T?E, is the appropriate manifold for the geometric description of time-dependent Hamiltonian systems. Based on previous work, we recall properties of the complete lifts of a type (1,1) tensor R on E to both T?E and J1??. We discuss how an interplay between both lifted tensors leads to the identification of related distributions on both manifolds. The integrability of these distributions, a coordinate free condition, is shown to produce exactly Forbat’s conditions for separability of the time-dependent Hamilton-Jacobi equation in appropriate coordinates.

Waeyaert, G.; Sarlet, W.

2014-12-01

383

V/STOL gets a lift  

NASA Technical Reports Server (NTRS)

The concept of a supersonic STOVL that could offer enhanced mission capability, survivability, operational flexibility, and utility over conventional aircraft is presented. Emphasis is currently on design studies, CFD work, small- and large-scale wind tunnel tests, simulation activities, flight experiments, and ground environment experiments. Propulsion system technology centers about the adaptation of existing or off-the-shelf engines. Concepts under study include separate flow in hover, gas-driven lift fan, and shaft-driven lift fan. NASA is examining generic valve and ducting configurations with airflow at ambient temperature and at temperatures up to 1000 F to gather pressure loss and heat transfer data. Advanced civil rotorcraft technologies examined include high-efficiency/dual-mode components such as torque converters; lightweight, quiet transmissions; and variable geometry power turbines; along with dual-function or convertible engines.

Biesiadny, Tom

1991-01-01

384

Lift and drag of cetacean flippers  

NASA Astrophysics Data System (ADS)

Field observation and collection of biological samples has resulted in cetacean (whales, dolphins and porpoises) flipper geometry being known for most species. However, the hydrodynamic properties of cetacean flippers have not been rigorously tested and thus their performance characteristics are unknown. Here, conducting water tunnel testing using scale models of cetacean flippers derived via computed tomography (CT) scans, as well as computational fluid dynamic (CFD) simulations, we present a baseline work to determine the hydrodynamic characteristics of cetacean flippers. We found that flippers of similar planform shape had similar hydrodynamic performance characteristics. Furthermore, one group of flippers of planform shape similar to a modern swept wing was found to have lift coefficient versus angle of attack curves that were biphasic rather than linear in nature, which was caused by the onset of vortex-dominated lift. Drag coefficient versus angle of attack curves were found to be less dependant on planform shape.

Murray, Mark; Weber, Paul; Howle, Laurens; Fish, Frank

2008-11-01

385

Pipe lifting hook having clamp assembly  

SciTech Connect

A pipe lifting hook is provided having a generally ''C'' shaped hook member having an elongated lower portion being insertable within the end of a joint of pipe and having an upper portion positionable above the pipe and provided with lifting connection means. The hook member is frictionally clamped to the pipe by grip shoe means that is movably supported by the upper portion of the hook member and is selectably movable from a released position out of contact with said pipe to a locked position in frictional locking engagement with the outer surface of the pipe. A ratchet mechanism couples said grip shoe means to the upper portion of the hook member and is manually positionable to lock said grip shoe means at said locked position or release said grip shoe means for movement toward said released position thereof.

Codner, J.A.

1984-06-12

386

Static Thrust Analysis of the Lifting Airscrew  

NASA Technical Reports Server (NTRS)

This report presents the results of a combined theoretical and experimental investigation conducted at the Georgia School of Technology on the static thrust of the lifting air screw of the type used in modern autogiros and helicopters. The theoretical part of this study is based on Glauert's analysis but certain modifications are made that further clarify and simplify the problem. Of these changes the elimination of the solidity as an independent parameter is the most important. The experimental data were obtained from tests on four rotor models of two, four, and five blades and, in general, agree quite well with the theoretical calculations. The theory indicates a method of evaluating scale effects on lifting air screws, and these corrections have been applied to the model results to derive general full-scale static thrust, torque, and figure-of-merit curves for constant-chord, constant-incidence rotors. Convenient charts are included that enable hovering flight performance to be calculated rapidly.

Knight, Montgomery; Hefner, Ralph A

1937-01-01

387

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

388

Lift production in the hovering hummingbird  

PubMed Central

Aerodynamic theory and empirical observations of animals flying at similar Reynolds numbers (Re) predict that airflow over hummingbird wings will be dominated by a stable, attached leading edge vortex (LEV). In insects exhibiting similar kinematics, when the translational movement of the wing ceases (as at the end of the downstroke), the LEV is shed and lift production decreases until the energy of the LEV is re-captured in the subsequent half-cycle translation. We here show that while the hummingbird wing is strongly influenced by similar sharp-leading-edge aerodynamics, leading edge vorticity is inconsistent, varying from 0.7 to 26 per cent (mean 16%) of total lift production, is always generated within 3 mm of the dorsal surface of the wing, showing no retrograde (trailing to leading edge) flow, and does not increase from proximal to distal wing as would be expected with a conical vortex (class III LEV) described for hawkmoths. Further, the bound circulation is not shed as a vortex at the end of translation, but instead remains attached and persists after translation has ceased, augmented by the rotation (pronation, supination) of the wing that occurs between the wing-translation half-cycles. The result is a near-continuous lift production through wing turn-around, previously unknown in vertebrates, able to contribute to weight support as well as stability and control during hovering. Selection for a planform suited to creating this unique flow and nearly-uninterrupted lift production throughout the wingbeat cycle may help explain the relatively narrow hummingbird wing. PMID:19656789

Warrick, Douglas R.; Tobalske, Bret W.; Powers, Donald R.

2009-01-01

389

Boeing 777 high lift control system  

Microsoft Academic Search

The Boeing 777 high lift control systems (HLCS), a state-of-the-art microprocessor-based system that provides fly-by-wire control, protection, and built-in-test and maintenance access functions for the leading edge slats and trailing edge flaps drive and actuation systems, is discussed. This system is designed to take advantage of technologically proven concepts as well as judicious application of new concepts in response to

J. Rea

1993-01-01

390

Unified treatment of lifting atmospheric entry  

NASA Technical Reports Server (NTRS)

This paper presents a unified treatment of the effect of lift on peak acceleration during atmospheric entry. Earlier studies were restricted to different regimes because of approximations invoked to solve the same transcendental equation. This paper shows the connection between the earlier studies by employing a general expression for the peak acceleration and obtains solutions to the transcendental equation without invoking the earlier approximations. Results are presented and compared with earlier studies where appropriate.

Nachtsheim, P. R.; Lehman, L. L.

1980-01-01

391

Lifting asymptotic degeneracies with the mirror TBA  

NASA Astrophysics Data System (ADS)

We describe a qualitative feature of the AdS5 × S5 string spectrum which is not captured by the asymptotic Bethe ansatz. This is reflected by an enhanced discrete symmetry in the asymptotic limit, whereby extra energy degeneracy enters the spectrum. We discuss how finite size corrections should lift this degeneracy, through both perturbative (Lüscher) and non-perturbative approaches (the Mirror TBA), and illustrate this explicitly on two such asymptotically degenerate states.

Sfondrini, Alessandro; van Tongeren, Stijn J.

2011-09-01

392

Factoring wavelet transforms into lifting steps  

Microsoft Academic Search

This article is essentially tutorial in nature. We show how any discrete wavelet transform or two band subband filtering with\\u000a finite filters can be decomposed into a finite sequence of simple filtering steps, which we call lifting steps but that are\\u000a also known as ladder structures. This decomposition corresponds to a factorization of the polyphase matrix of the wavelet\\u000a or

Ingrid Daubechies; Wim Sweldens

1998-01-01

393

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

394

Dragonfly flight. III. Lift and power requirements.  

PubMed

A mean lift coefficient quasi-steady analysis has been applied to the free flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens. The analysis accommodated the yaw and accelerations involved in free flight. For any given velocity or resultant aerodynamic force (thrust), the damselfly mean lift coefficient was higher than that for the dragonfly because of its clap and fling. For both species, the maximum mean lift coefficient L was higher than the steady CL,max. Both species aligned their strokes planes to be nearly normal to the thrust, a strategy that reduces the L required for flight and which is different from the previously published hovering and slow dragonfly flights with stroke planes steeply inclined to the horizontal. Owing to the relatively low costs of accelerating the wing, the aerodynamic power required for flight represents the mechanical power output from the muscles. The maximum muscle mass-specific power was estimated at 156 and 166 W kg-1 for S. sanguineum and C. splendens, respectively. Measurements of heat production immediately after flight resulted in mechanical efficiency estimates of 13 % and 9 % for S. sanguineum and C. splendens muscles, respectively. PMID:9318294

Wakeling, JM; Ellington, CP

1997-02-01

395

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

1992-01-01

396

Analysis of particulates on tape lift samples  

NASA Astrophysics Data System (ADS)

Particle counts on tape lift samples taken from a hardware surface exceeded threshold requirements in six successive tests despite repeated cleaning of the surface. Subsequent analysis of the particle size distributions of the failed tests revealed that the handling and processing of the tape lift samples may have played a role in the test failures. In order to explore plausible causes for the observed size distribution anomalies, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were employed to perform chemical analysis on collected particulates. SEM/EDX identified Na and S containing particles on the hardware samples in a size range identified as being responsible for the test failures. ToF-SIMS was employed to further examine the Na and S containing particulates and identified the molecular signature of sodium alkylbenzene sulfonates, a common surfactant used in industrial detergent. The root cause investigation suggests that the tape lift test failures originated from detergent residue left behind on the glass slides used to mount and transport the tape following sampling and not from the hardware surface.

Moision, Robert M.; Chaney, John A.; Panetta, Chris J.; Liu, De-Ling

2014-09-01

397

Video-assisted endoscopic transtemporal multilayer upper midface lift (MUM-Lift).  

PubMed

Minimally invasive surgery has been used successfully recently to improve brow ptosis and forehead rhytids. Because the face tends to age more vertically, rather than obliquely, it makes sense to perform the correction in a more vertical direction. Therefore, the authors introduce a video-assisted endoscopic transtemporal approach to allow a multiplanar (subperiosteal, sub-SMAS, and subcutaneous) vertical upper midface elevation (MUM-Lift) avoiding extensive lateral temporal and preauricular incisions. Between 1996 and 2003, 53 patients (8 males, 45 females; age, 47 +/- 6 years) underwent MUM-Lift. This includes simultaneous forehead lift, blepharoplasties and video-assisted transtemporal sub-SMAS and subcutaneous upper midface tissue release, vertico-lateral repositioning, and fixation. Using the various planes of release in the midface produces less tension on each layer and provides a natural and improved facial rejuvenation of the forehead, as well as of the upper midface. The results confirmed that limited incision forehead-plasty techniques in combination with a transtemporal sub-SMAS and subcutaneous upper midface lift (MUM-Lift) reduces unnecessary vascular compromise on any particular layer and can be safely and predictably performed over the zygomatic muscle. This newly introduced procedure is an exciting feature that has evolved into a useful modality. It provides natural and improved facial rejuvenation. PMID:15750424

de la Fuente, Antonio; Hönig, Johannes Franz

2005-03-01

398

LiftingWiSe: A Lifting-Based Efficient Data Processing Technique in Wireless Sensor Networks  

PubMed Central

Monitoring thousands of objects which are deployed over large-hard-to-reach areas, is an important application of the wireless sensor networks (WSNs). Such an application requires disseminating a large amount of data within the WSN. This data includes, but is not limited to, the object's location and the environment conditions at that location. WSNs require efficient data processing and dissemination processes due to the limited storage, processing power, and energy available in the WSN nodes. The aim of this paper is to propose a data processing technique that can work under constrained storage, processing, and energy resource conditions. The proposed technique utilizes the lifting procedure in processing the disseminated data. Lifting is usually used in discrete wavelet transform (DWT) operations. The proposed technique is referred to as LiftingWiSe, which stands for Lifting-based efficient data processing technique for Wireless Sensor Networks. LiftingWiSe has been tested and compared to other relevant techniques from the literature. The test has been conducted via a simulation of the monitored field and the deployed wireless sensor network nodes. The simulation results have been analyzed and discussed. PMID:25116902

Aboelela, Emad

2014-01-01

399

The development of an EMG-assisted model to assess spine loading during whole-body free-dynamic lifting.  

PubMed

Low back disorders (LBDs) are the most common and costly occupationally-related compensable conditions facing employers today. Over the years several biomechanical assessment models have been developed that intended to assess the load profile imposed upon the spine during lifting and, thus, intended to facilitate the control of LBD risk in the workplace. Many of these biomechanical models have evolved based upon assumptions about how the trunk musculature respond to loads imposed upon the body during lifting. However, few of these models have been able to accurately predict the co-contraction of the trunk musculature which has been shown to have a major influence on the development of spinal loads. Thus, our understanding of how the spine is loaded under realistic dynamic lifting conditions has been deficient. A biologically-assisted or EMG-assisted model has been developed in our laboratory over the past 15 years which endeavours to overcome these traditional problems. The model has been assessed in the sagittal, coronal, and torsional planes of the body. The model development and performance will be reviewed as well as the benefits for controlling occupationally-related LBDs. PMID:11369269

Marras, W S.; Granata, K P.

1997-12-01

400

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

401

Occupancy Simulation Schedule Appendix C -Occupancy Simulation Schedule  

E-print Network

Appendix C ­ Occupancy Simulation Schedule #12;C.1 Appendix C - Occupancy Simulation Schedule Figure C.1 and Figure C.2 present the load simulation and occupancy schedules for the lab homes highly insulating windows demonstration. The bases for occupancy simulation were data and analysis developed

402

Occupational health nursing in Thailand. Insight into international occupational health.  

PubMed

1. As a country that is both agricultural by nature, and moving toward new industrialization, Thailand is increasingly facing work related health problems. Major occupational illnesses are pesticide poisoning, silicosis, byssinosis, lead poisoning, and occupational injuries. 2. Although the demand for occupational health services is high, occupational health services in Thailand are still not comprehensive. 3. Because of the lack of role perception and inadequate preparation, Thai occupational health nurses have limited functions in providing occupational health services. The services are primarily directed at curative measures rather than prevention. 4. Occupational health nursing in Thailand is currently undergoing intensive development in education, practice, research, and legislation. PMID:12655981

Kalampakorn, Surintorn

2003-02-01

403

Occupational Health--Or Occupational Sickness?  

PubMed Central

The current emphasis on occupational health and safety has been on curative practice as opposed to preventive measures. Business accumulates profit; if required by law, it treats those diseases or handicapped workers who have suffered due to unsafe, unhealthy working conditions. The illness of the worker often becomes a side effect of production, patched up after the fact. Such a problem oriented approach is insufficient. Ontario's occupational health legislation is ambiguous. Workers' rights are insecure. Experience in Saskatchewan has proven that well defined legislation against hazardous working conditions does not disrupt production. This article offers a progressive alternative to promote and maintain the highest degree of physical and social wellbeing of individual workers and groups in the workplace.

Dukszta, Jan

1978-01-01

404

Occupational hearing loss  

MedlinePLUS

Over time, repeated exposure to loud noise and music can cause hearing loss. Occupational hearing loss is ... Airline ground maintenance Construction Farming Jobs involving loud music or machinery In the U.S., the maximum job ...

405

Wisconsin Occupational Information System.  

National Technical Information Service (NTIS)

The first annual report of the Wisconsin Occupational Information System (WOIS) is a descriptive analysis of activities and procedures utilized during the initial grant period of July 14, 1975-July 13, 1976. This report is divided into eight sections summ...

R. H. Lambert

1976-01-01

406

Occupational lung diseases.  

PubMed

Chest radiography and high-resolution computed tomography are indispensable tools in the detection, classification and characterization of occupational lung diseases that are caused by inhaling mineral particles such as asbestos, silicon-containing rock dust and other tissue-damaging antigens, nanomaterials and toxins. Radiographic evidence of occupational lung disease is interpreted with a patient's clinical signs and symptoms and a detailed occupational history in mind because of high variability in radiographic findings. This Directed Reading reviews the history, epidemiology, functional anatomy, pathobiology and medical diagnostic imaging of occupational lung diseases associated with inhalation of fine particulates in the workplace. This article is a Directed Reading. Your access to Directed Reading quizzes for continuing education credit is determined by your CE preference. For access to other quizzes, go to www.asrt.org/store. PMID:21771937

Furlow, Bryant

2011-01-01

407

Three dimensional moments in the lumbar spine during asymmetric lifting.  

PubMed

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 degrees ), 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 in the literature, yet free-style asymmetric tasks have not been intensively studied. METHODS: Infrared markers and EMG electrodes were fixed to ten subjects. Subjects were asked to lift a 45 N weight from three different positions in relation to the sagittal plane. External loads on the L3-L4 and L4-L5 disc planes were calculated. Maximum moments and EMG were compared with those at lift off and set down of the burden. All lifts were repeated twice. RESULTS: Introducing asymmetry to the lift increased lateral bending and twisting moments. Flexion moments increased by approximately 5% after lift off of the load. During the second repetition of the lift, flexion and twisting moments decreased and increased, respectively. EMG signals were greater on the contralateral side during asymmetric lifts. CONCLUSIONS: Asymmetric lifting places complex loads across the trunk, which may become increasingly asymmetric with repeated trials. RELEVANCE: Individuals should take precautions to perform lifts in a symmetric manner and to avoid repetitive asymmetric lifting if possible. Past study indicated that twisting and lateral bending loads, when coupled with flexion loads, resulted in much greater disc compression and should be avoided. This work described the degree to which lateral bending and twisting loads were introduced as lifts deviated from the sagittal plane. PMID:11415813

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

1998-09-01

408

How Occupation Emerges in the Practices of Experienced Occupational Therapists  

Microsoft Academic Search

Occupation has reemerged as the central heuristic for occupational therapy practice (AOTA, 2002). However, there is currently little agreement on a definition of occupation-based practice. Some scholars have theorized that occupation-based practice occurs when therapists provide intervention in the individual’s natural context, using the individual’s occupations as therapeutic interventions (Fidler, 2000; Hocking, 2001; Pierce, 2003). Other scholars have empirically demonstrated

Pollie Price

2006-01-01

409

Occupational lung cancer  

Microsoft Academic Search

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

D. B. Coultas; J. M. Samet

1992-01-01

410

Fathers' occupation and pregnancy outcome  

Microsoft Academic Search

Findings from a survey of 56,067 women in Montreal on maternal occupation and pregnancy outcome have been reported. Paternal occupation recorded in the same survey was analysed for spontaneous abortion in 24 occupational groups retaining the six main sectors of maternal occupation and allowing, by means of logistic regression, for seven potentially confounding variables. In only one of the 24

A. D. Mcdonald; J. C. Mcdonald; B. Armstrong; N. M. Cherry; A. D. Nolin; D. Robert

1989-01-01

411

Occupational Employment Projections to 2010.  

ERIC Educational Resources Information Center

Employment in professional and related occupations and service occupations will increase the fastest and add the most jobs from 2000 to 2010. Changes in technology or business operations will cause the largest declines in occupational demand. Occupations requiring a postsecondary award or academic degree will account for 42 percent of total job…

Hecker, Daniel E.

2001-01-01

412

HEAVY GOODS VEHICLE ACCIDENTS ON ROUNDABOUTS: PARAMETERS OF INFLUENCE  

E-print Network

was proved to give accurate predictions of vehicle dynamics parameters such as yaw speed or wheel liftHEAVY GOODS VEHICLE ACCIDENTS ON ROUNDABOUTS: PARAMETERS OF INFLUENCE Veronique CEREZO Laboratoire with one of the three. Secondly, a software called PROSPER was used, which allows the simulation of vehicle

Paris-Sud XI, Université de

413

Pilot gas-lift system at Prudhoe Bay  

SciTech Connect

This paper discusses the design concepts and operating experiences of a small, twelve-well gas lift system in a unique arctic environment. The project was undertaken by Sohio Alaska Petroleum Company as operator for the Western Operating Area of the Prudhoe Bay Unit. This pilot system provided valuable operating data prior to the startup of the full field gas lift system which, in its final configuration, will be the largest gas lift facility in the United States. This paper illustrates the intimate interaction of all of the variables that can affect gas lift such as supply pressure, separator pressure, tubing hydraulics, flowline hydraulics, geothermal temperature gradient, and gas lift valve characteristics. It also addresses some of the concerns that are unique to the operation of gas lift systems in an arctic environment.

Hanson, E.S.

1985-03-01

414

Back injury prevention: a lift team success story.  

PubMed

Work related back injuries among hospital personnel account for high volume, high cost workers' compensation claims. These injuries can be life altering experiences, affecting both the personal and professional lives of injured workers. Lifting must be viewed as a skill involving specialized training and mandated use of mechanical equipment, rather than as a random task performed by numerous health care providers. The use of a lift team specially trained in body mechanics, lifting techniques, and the use of mandated mechanical equipment can significantly affect injury data, financial outcomes, and employee satisfaction. The benefits of a lift team extend beyond the effect on injury and financial outcomes--they can be used for recruitment and retention strategies, and team members serve as mentors to others by demonstrating safe lifting techniques. Ultimately, a lift team helps protect a valuable resource--the health care worker. PMID:12846457

Hefti, Kelly S; Farnham, Richard J; Docken, Lisa; Bentaas, Ruth; Bossman, Sharon; Schaefer, Jill

2003-06-01

415

Aerodynamic characteristics of a propeller powered high lift semispan wing  

NASA Technical Reports Server (NTRS)

An experimental investigation was conducted on the engine/airframe integration aerodynamics for potential high-lift aircraft configurations. The model consisted of a semispan wing with a double-isolated flap system and a Krueger leading edge device. The advanced propeller and the powered nacelle were tested and aerodynamic characteristics of the combined system are presented. It was found that the lift coefficient of the powered wing could be increased by the propeller slipstream when the rotational speed was increased and high-lift devices were deployed. Moving the nacelle/propeller closer to the wing in the vertical direction indicated higher lift augmentation than a shift in the longitudinal direction. A pitch-down nacelle inclination enhanced the lift performance of the system much better than vertical and horizontal variation of the nacelle locations and showed that the powered wing can sustain higher angles of attack near maximum lift performance.

Takallu, M. A.; Gentry, G. L., Jr.

1992-01-01

416

Determining safe limits for significant task parameters during manual lifting.  

PubMed

This experimental study investigated the effect of lifting task parameters (i.e., lifting weight, frequency, coupling, asymmetric angle, and vertical, horizontal, and travel distances) for various dynamic human lifting activities on the ground reaction forces of workers. Ten male workers loaded containers from different levels asymmetrically during experimental trials. The experimental design evolved using Taguchi's Fractional Factorial Experiments. Three factors (lifting weight, frequency, and vertical distance) were observed to be significant. The results showed that vertical reaction forces increase when workers lift weight from floor to shoulder height frequently. It was also observed that instantaneous loading rate increases with more weight, vertical distance, and frequency; a significant extra loading rate is required to change the lower level of load, frequency, and vertical distance to higher levels. Safe limits for significant factors were determined to result in optimal performance of the manual lifting task. PMID:24702682

Singh, Ravindra Pratrap; Batish, Ajay; Singh, Tejinder Pal

2014-04-01

417

Arm lift strength in work space.  

PubMed

This study was conducted to determine arm strength values for isometric and isokinetic efforts around the human trunk. Thirty-eight normal young adults (20 male and 18 female) performed a total of 19 tasks. These consisted of one self-selected optimum posture with upright stance and elbows bent at 90 degrees , designated as standard posture for isometric test. In addition, isometric testing was done sagittally symmetrical 30 degrees and 60 degrees lateral planes at half-, three-quarters- and full-reach distances at knuckle height. The isokinetic tests were done between knuckle height and shoulder height in postures identical to isometric tests. The sequence of these tasks was randomised. The peak strength in standard posture was invariably lower than the peak strength at half-reach in isometric condition in all three planes for both sexes with the exception of one condition among females (60 degrees lateral plane, half-reach isometric). Peak and average arm lift strengths of males were significantly higher than those of females (p < 0.01) and ranged between 44% and 71%. For both sexes isometric strength was significantly higher than isokinetic strength (p < 0.01). The peak and average strengths in the sagittal plane were invariably higher than those of asymmetric postures, with one exception among females. With increasing reach distance the strength declined significantly for all conditions among both genders (p < 0.01). The ANOVA showed that the gender, mode of lifting, postural symmetry and reach of lifting, in addition to affecting the peak and average strength individually (p < 0.01), had significant 2-way and 3-way interactions (p < 0.01). All strength values were inter-correlated (p < 0.01). The regressions predicting peak and average strengths from anthropometric characteristics and sagittal plane strengths accounted for 63% to 89% of all variance and were highly significant (p < 0.01). PMID:15676830

Kumar, S

1991-10-01

418

The Lifting Body Legacy...X-33  

NASA Technical Reports Server (NTRS)

NASA has a technology program in place to enable the development of a next generation Reusable Launch Vehicle that will carry our future payloads into orbit at a much-reduced cost. The VentureStar, Lifting Body (LB) flight vehicle, is one of the potential reusable launch vehicle configurations being studied. A LB vehicle has no wings and derives its lift solely from the shape of its body, and has the unique advantages of superior volumetric efficiency, better aerodynamic efficiency at high angles-of-attack and hypersonic speeds, and reduced thermal protection system weight. Classically, in a ballistic vehicle, drag has been employed to control the level of deceleration in reentry. In the LB, lift enables the vehicle to decelerate at higher altitudes for the same velocity and defines the reentry corridor which includes a greater cross range. This paper outlines the flight stability and control aspects of our LB heritage which was utilized in the design of the VentureStar LB and its test version, the X-33. NASA and the U.S. Air Force have a rich heritage of LB vehicle design and flight experience. In the initial LB Program, eight LB's were built and over 225 LB test flights were conducted through 1975. Three LB series were most significant in the advancement of today's LB technolocy: the M2-F; the HL-10; and the X-24 series. The M2-F series was designed by NASA Ames Research Center, the HL-10 series by NASA Langley Research Center, and the X-24 series by the U. S. Air Force. LB vehicles are alive again today with the X- 33, X-38, and VentureStar.

Barret, Chris

1999-01-01

419

Labyrinth seal testing for lift fan engines  

NASA Technical Reports Server (NTRS)

An abradable buffered labyrinth seal for the control of turbine gas path leakage in a tip-turbine driven lift fan was designed, tested, and analyzed. The seal configuration was not designed to operate in any specific location but was sized to be evaluated in an existing test rig. The final sealing diameter selected was 28 inches. Results of testing indicate that the flow equations predicted seal air flows consistent with measured values. Excellent sealing characteristics of the abradable coating on the stator land were demonstrated when a substantial seal penetration of .030 inch into the land surface was encountered without appreciable wear on the labyrinth knife edges.

Dobek, L. J.

1973-01-01

420

HSR High Lift Program and PCD2 Update  

NASA Technical Reports Server (NTRS)

The mission of High-Lift Technology is to develop technology allowing the design of practical high lift concepts for the High-Speed Civil Transport (HSCT) in order to: 1) operate safely and efficiently; and 2) reduce terminal control area and community noise. In fulfilling this mission, close and continuous coordination will be maintained with other High-Speed Research (HSR) technology elements in order to support optimization of the overall airplane (rather than just the high lift system).

Kemmerly, Guy T.; Coen, Peter; Meredith, Paul; Clark, Roger; Hahne, Dave; Smith, Brian

1999-01-01

421

Heavy drinking in early adulthood and outcomes at mid life  

PubMed Central

Background Heavy drinking in early adulthood among Blacks, but not Whites, has been found to be associated with more deleterious health outcomes, lower labor market success and lower educational attainment at mid-life. This study analysed psychosocial pathways underlying racial differences in the impact of early heavy alcohol use on occupational and educational attainment at mid-life. Methods Outcomes in labor market participation, occupational prestige and educational attainment were measured in early and mid-adulthood. A mixture model was used to identify psychosocial classes that explain how race-specific differences in the relationship between drinking in early adulthood and occupational outcomes in mid-life operate. Data came from Coronary Artery Risk Development in Young Adults, a longitudinal epidemiologic study. Results Especially for Blacks, heavy drinking in early adulthood was associated with a lower probability of being employed in mid-life. Among employed persons, there was a link between heavy drinking for both Whites and Blacks and decreased occupational attainment at mid-life. We grouped individuals into three distinct distress classes based on external stressors and indicators of internally generated stress. Blacks were more likely to belong to the higher distressed classes as were heavy drinkers in early adulthood. Stratifying the data by distress class, relationships between heavy drinking, race and heavy drinking—race interactions were overall weaker than in the pooled analysis. Conclusions Disproportionate intensification of life stresses in Blacks renders them more vulnerable to long-term effects of heavy drinking. PMID:20713371

Sloan, F A; Costanzo, P R; Belsky, D; Holmberg, E; Malone, P S; Wang, Y; Kertesz, S

2013-01-01

422

High-lift aerodynamics: Trends, trades, and options  

NASA Technical Reports Server (NTRS)

The trend toward the utilization of higher maximum lift coefficient with increased aircraft size and cruise velocities is discussed. The impact of this trend on the need for tradeoffs between cruise performance and takeoff, climb, and landing performance is examined. Theoretical methods for the analysis of the two-dimensional characteristics of flap systems are described and compared with experimental data. Four powered-lift concepts are described to outline some of the options currently being developed. Two jet-flap theories are described which provide analytical methods for estimation of the three-dimensional aerodynamic high-lift performance characteristics of powered lift systems.

Margason, R. J.; Morgan, H. L., Jr.

1975-01-01

423

Aerodynamic Characteristics of a Propeller-Powered High-Lift  

E-print Network

A small-scale semispan high-lift wing- ap system equipped under the wing with a turboprop engine assembly was tested in the Langley 14- by 22-Foot Subsonic Tunnel. Experimental data were obtained for various propeller rotational speeds, nacelle locations, and nacelle inclinations. To isolate the e ects of the high-lift system, data were obtained with and without the aps and leading-edge device. The e ects of the propeller slipstream on the overall longitudinal aerodynamic characteristics of the wing-propeller assembly were examined. Test results indicated that the lift coe cient of the wing could be increased by the propeller slipstream when the rotational speed was increased and high-lift devices were deployed. Decreasing the nacelle inclination (increased pitch down) enhanced the lift performance of the system much more than varying the vertical or horizontal location of the nacelle. Furthermore, decreasing the nacelle inclination led to higher lift curve slope values, which indicated that the powered wing could sustain higher angles of attack near maximum lift performance. Any lift augmentation was accompanied by a drag penalty due to the increased wing lift.

Semispan Wing; Garl L. Gentry; M. A. Takallu

424

Inverse lift: a signature of the elasticity of complex fluids?  

E-print Network

To understand the mechanics of a complex fluid such as a foam we propose a model experiment (a bidimensional flow around an obstacle) for which an external sollicitation is applied, and a local response is measured, simultaneously. We observe that an asymmetric obstacle (cambered airfoil profile) experiences a downards lift, opposite to the lift usually known (in a different context) in aerodynamics. Correlations of velocity, deformations and pressure fields yield a clear explanation of this inverse lift, involving the elasticity of the foam. We argue that such an inverse lift is likely common to complex fluids with elasticity.

Benjamin Dollet; Miguel Aubouy; Francois Graner

2004-11-25

425

Interior room within eastern lift span, showing auxiliary electric and ...  

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

Interior room within eastern lift span, showing auxiliary electric and gas generators. - Connecticut Avenue Bridge, Spans Rock Creek & Potomac Parkway at Connecticut Avenue, Washington, District of Columbia, DC

426

Occupational health in India.  

PubMed

The population of India has crossed the billion mark; only one other country (China) shares this distinction. A declining female population and low literacy are negatives in an otherwise vibrant country. The empowerment of females and their role in society has become a point of debate, and radical economic changes are likely, to allow India to join the global economy. Problems in occupational health and safety (OHS) include: OHS legislation that covers only a minority of the working population; child labour; a physician-driven OHS model; little attention to industrial hygiene; poor surveillance of occupational diseases (making it impossible to gauge the burden of illness due to occupational exposures); and a fragile OHS academic base. A silver lining comprises the inclusion of OHS in national health policy and the decision by the Indian Medical Association to educate its members in occupational health. India urgently requires modern OHS legislation with adequate enforcement machinery, and establishment of centres of excellence in occupational medicine, to catch up with the rest of the world. PMID:12028949

Joshi, Tushar Kant; Smith, Kirk R

2002-01-01

427

[Somnology and occupational safety].  

PubMed

Somnology has saved up enough great volume of objective knowledge of negative effects of a lack of the sleep, the raised drowsiness and sleep pathologies for health of people and occupational safety to formulate this knowledge in the accessible form for a society and acceptance by the state of acts and the organizational actions preventing these negative effects. The necessity of the salvation of these problems has led to occurrence of a new area of occupational sleep medicine, which problem is the analysis of influence of physiological mechanisms ofa sleep and functioning circadian systems on efficiency of professional activity and health of people. For a designation of the various items causing infringements of professional work use the term fatique. It is believed that fatigue development is connected with three major factors: deficiency of a sleep - defined by duration of previous wakefulness and a sleep, time-of-day and at last, task-related factors. Within the limits of approaches developed the occupational sleep medicine had been formulated the Fatigue Risk Management System. In the Russian literature there is a lack of the information on influence of mechanisms of a sleep on occupational safety, therefore the review will be interesting to a wide range of the experts dealing with the analysis of the human factor, health and an occupational safety PMID:23697221

Dorokhov, V B

2013-01-01

428

Occupational requirements as compared to worker capabilities with respect to total weight lifted per day  

E-print Network

, this research was designed to compare worker capabilities with tasks regularly required in the work environment. Data was gathered on 442 (403 male, 39 female) experienced manual material handlers from a variety of companies with the intent of determining...

Narvaez, Angela Marae

2012-06-07

429

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

PubMed

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 whether lifting belts are a benefit or a liability to manual materials-handling activities. A review of the literature demonstrates that there is a large amount of conflicting evidence and few definitive, well-executed studies upon which to base an opinion regarding these devices. METHODS: Fifteen subjects lifted boxes of 14 kg and 23 kg from sagitally symmetric and asymmetric origins to an upright posture. Dynamic trunk motions, lifting moments, myoelectric activity and modelled spinal loads were examined as a function of three belt styles (elastic, leather, and orthotic) and compared with results from a no-belt condition. RESULTS: Lifting belts reduced peak trunk angles, velocities and accelerations in the sagittal, lateral and transverse planes. However, only the elastic belt successfully reduced trunk motions in all three dimensions. The orthotic belt significantly increased the lifting moment associated with a given weight. A minor redistribution in muscle activity was observed when wearing an elastic belt. A statistically significant reduction in spinal load was associated with the elastic belt. However, a great deal of variability between subjects was noted. Some subjects experienced increased spinal load while wearing the elastic lifting belt. CONCLUSIONS: These results demonstrate that the biomechanical operation of lifting can be influenced by the type of lifting belts used. PMID:11415679

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

1997-03-01

430

Lift Every Voice: Music in American Life  

NSDL National Science Digital Library

The University of Virginia Library is hosting a special exhibition called Lift Every Voice, named after a hymn composed by two African-American brothers in the days of the Jim Crow South and aiming to inspire the struggle for equal rights. The Lift Every Voice exhibition commemorates and celebrates a variety of songs that were a part of everyday American life through the centuries. No time to visit Virginia? Then visit the exhibition's Website and enjoy reading about the history behind our country's ballads, hymns, patriotic anthems, minstrels, musicals, and protest songs while listening to audio clips of selected songs (QuickTime, MP3). The text is enriched by digital images of historical papers, compiled by Virginia's Albert H. Small Special Collections Library, including musical scores, photos of musicians, and printed lyrics. The site also contains a section on Thomas Jefferson's relationship to music in the Old South, with digital images of texts from Jefferson's library and, of course, a sample of "Carry Me Back to Old Virginny."

2001-01-01

431

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

432

Lifting Mechanism for the Mars Explorer Rover  

NASA Technical Reports Server (NTRS)

A report discusses the design of a rover lift mechanism (RLM) -- a major subsystem of each of the Mars Exploration Rover vehicles, which were landed on Mars in January 2004. The RLM had to satisfy requirements to (1) be foldable as part of an extremely dense packing arrangement and (2) be capable of unfolding itself in a complex, multistep process for disengaging the rover from its restraints in the lander, lifting the main body of the rover off its landing platform, and placing the rover wheels on the platform in preparation for driving the rover off the platform. There was also an overriding requirement to minimize the overall mass of the rover and lander. To satisfy the combination of these and other requirements, it was necessary to formulate an extremely complex design that integrated components and functions of the RLM with those of a rocker-bogie suspension system, the aspects of which have been described in several prior NASA Tech Briefs articles. In this design, suspension components also serve as parts of a 4- bar linkage in the RLM.

Melko, Joseph; Iskenderian, Theodore; Harrington, Brian; Voorhees, Christopher

2005-01-01

433

Efficient lifting methods for unstructured mixed integer programs with multiple constraints  

Microsoft Academic Search

In this thesis, we introduce efficient lifting methods to generate strong cutting planes for unstructured mixed integer programs (MIPs) with multiple constraints. Our results include improved sequential lifting methods and novel sequence independent lifting methods using multidimensional superadditive lifting functions. ^ First we investigate sequential lifting for general 0–1 MIPs. We introduce a new scheme to obtain strong bounds on

Bo Zeng

2007-01-01

434

Psychophysically determined symmetric and asymmetric lifting capacity of Chinese males for one hour's work shifts  

Microsoft Academic Search

A laboratory experiment was conducted to determine the effects of asymmetric lifting on psychophysically determined maximum acceptable weight of lift (MAWL) and the resulting heart rate, oxygen uptake and rating of perceived exertion. Thirteen male college students were recruited as participants. Each participant performed 12 different lifting tasks involving three lifting frequencies (one-time maximum, 1 and 4 lifts\\/min) and four

Swei-Pi Wu

2000-01-01

435

Occupation and gastric cancer  

PubMed Central

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; Podas, T

2003-01-01

436

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

437

AFC-Enabled Simplified High-Lift System Integration Study  

NASA Technical Reports Server (NTRS)

The primary objective of this trade study report is to explore the potential of using Active Flow Control (AFC) for achieving lighter and mechanically simpler high-lift systems for transonic commercial transport aircraft. This assessment was conducted in four steps. First, based on the Common Research Model (CRM) outer mold line (OML) definition, two high-lift concepts were developed. One concept, representative of current production-type commercial transonic transports, features leading edge slats and slotted trailing edge flaps with Fowler motion. The other CRM-based design relies on drooped leading edges and simply hinged trailing edge flaps for high-lift generation. The relative high-lift performance of these two high-lift CRM variants is established using Computational Fluid Dynamics (CFD) solutions to the Reynolds-Averaged Navier-Stokes (RANS) equations for steady flow. These CFD assessments identify the high-lift performance that needs to be recovered through AFC to have the CRM variant with the lighter and mechanically simpler high-lift system match the performance of the conventional high-lift system. Conceptual design integration studies for the AFC-enhanced high-lift systems were conducted with a NASA Environmentally Responsible Aircraft (ERA) reference configuration, the so-called ERA-0003 concept. These design trades identify AFC performance targets that need to be met to produce economically feasible ERA-0003-like concepts with lighter and mechanically simpler high-lift designs that match the performance of conventional high-lift systems. Finally, technical challenges are identified associated with the application of AFC-enabled highlift systems to modern transonic commercial transports for future technology maturation efforts.

Hartwich, Peter M.; Dickey, Eric D.; Sclafani, Anthony J.; Camacho, Peter; Gonzales, Antonio B.; Lawson, Edward L.; Mairs, Ron Y.; Shmilovich, Arvin

2014-01-01

438

Effects of occupationally-oriented rehabilitation on farmers' work techniques, musculoskeletal symptoms, and work ability  

Microsoft Academic Search

Changes in work techniques, musculoskeletal symptoms and work ability were studied after occupationally-oriented rehabilitation courses for farmers experiencing low back or shoulder pain. Fifty-two women and 43 men participated. The OWAS analysis of work postures, biomechanical modeling of lifting techniques, and a questionnaire were used before and after the courses and after 1 year of follow-up. Bent and twisted postures

Nina Nevala-Puranen

1996-01-01

439

Tapping into social resources to address occupational health : a network analysis of Vietnamese-owned nail salons  

E-print Network

Social networks in the Vietnamese nail salon industry were studied for their utility in addressing occupational health risks. Major findings include heavy reliance on family networks for fundamental needs, an extensive ...

Doan, Tam Minh-Thi, 1976-

2004-01-01

440

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, looking north west. Showing rope connectors and welding cut from tower removal. - Tensaw River Lift Bridge, Spanning Tensaw River at U.S. Highway 90, Mobile, Mobile County, AL

441

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

442

Physiological responses to weight lifting in different planes  

Microsoft Academic Search

A weight of 10 kg was lifted by 11 normal male volunteers (mean age 34·2 years) from ground to knee, hip, and shoulder levels in the sagittal, lateral and oblique planes. During these lifting manoeuvres intra-abdominal pressure was measured by telemetry and the activity of erector spinae and external oblique were recorded by electromyography. The values obtained for peak and

S. KUMAR

1980-01-01

443

Temporal relationships of load and lumbar spine kinematics during lifting  

Microsoft Academic Search

Most industrial lifting guidelines assume that lifts are executed in a slow and smooth manner. However, these guidelines are not consistent with empirical observations made in industry. Although many researchers have identified the importance of kinetic and kinematic variables to the understanding of low back pathomechanics, few have investigated the temporal relationships between the dynamic inertial characteristics of the load

Scott MacKinnon; Jian-Chuan Li

1998-01-01

444

Growth hormone responses during intermittent weight lifting exercise in men  

Microsoft Academic Search

Summary  Five normal male volunteers performed two intermittent weight lifting exercises of equal total external work output and duration (20 min) with identical work-rest intervals but different load and frequency of movements. Exercise I consisted of seven sets of seven vertical leg lifts at 85% of the subject's Seven Repetition Maximum (SRM) and, 5 days later, seven sets of 21 vertical

W. P. Vanhelder; M. W. Radomski; R. C. Goode

1984-01-01

445

SSRL Hoisting & Rigging Lift Plan Stanford Synchrotron Radiation Laboratory  

E-print Network

SSRL Hoisting & Rigging Lift Plan Stanford Synchrotron Radiation Laboratory May 16, 2005 SSRL will be controlled or mitigated. Rigging Details Attach a rigging sketch or photographs to documentation the rigging the load require SSRL Rigging Panel approval. Lifts that involve loads that, if dropped, could release

Wechsler, Risa H.

446

Structural Assessment of Steel Waste Disposal Box Lifting Yoke  

SciTech Connect

Prepare a detailed structural analysis of the steel waste disposal box lifting yoke, sufficient to comply with the Hanford Site Hoisting & Rigging Manual (DOE/RL-92-36) Section II and the American National Standard for Below-the-Hook Lifting Devices.

NORTHEY, M.D.

2001-12-14

447

UF{sub 6} cylinder lifting equipment enhancements  

SciTech Connect

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 (UF{sub 6}). 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.

Hortel, J.M. [Martin Marietta Energy Systems, Inc., Piketon, OH (United States)

1991-12-31

448

Detailed Structure and Stabilization Mechanism of Lifted Laminar Methane Flame  

Microsoft Academic Search

The present study has numerically investigated the lifted flame field frequently encountered in the actual fire situations. This study employs the physical submodels including the detailed chemical kinetics, the variable transport properties, and the radiation model. A lifted laminar CH4\\/air flame with a central diluted fuel jet and a surrounding fuel-lean coflow is chosen as a validation case. Computations are

Hoo-Joong Kim; Yong-Mo Kim

2002-01-01

449

A modified lifting line theory for wing-propeller interference  

NASA Technical Reports Server (NTRS)

An inviscid incompressible model for the interaction of a wing with a single propeller slipstream is presented. The model allows the perturbation quantities to be potential even though the undisturbed flow is rotational. The governing equations for the spanwise lift distribution are derived and a simple method of solving these is indicated. Spanwise lift and induced drag distribution for two cases are computed.

Prabhu, R. K.; Tiwari, S. N.

1983-01-01

450

A hedonic price model for ski lift tickets  

Microsoft Academic Search

Using a unique database of 84 ski resorts and 1520 ski lifts and cable cars in Austria, we investigate the relationship between lift ticket prices for the 2005–2006 season and the ski resorts’ characteristics. The results, which were obtained by OLS and robust regression techniques, show that the length of the ski runs, transport capacity (measured as vertical transport metres

Martin Falk

2008-01-01

451

EUROLIFT - advanced high lift aerodynamics for transport aircraft  

Microsoft Academic Search

The overall objective of the European High Lift Programme (EUROLIFT) is to reduce time and cost of the design process of high lift systems which will be reached by the development of more reliable computational and experimental design tools. This paper gives an overview of the EUROLIFT project and presents results of the first year.

Peter Thiede

2001-01-01

452

Fuel effects on flame lift-off under diesel conditions  

SciTech Connect

An apparent relation between the lift-off length under diesel conditions and the ignition quality of a fuel has previously been reported. To cast light on the underlying mechanism, the current study aims to separate flame lift-off effects of the chemical ignition delay from those of other fuel properties under diesel conditions. Flame lift-off was measured in an optical diesel engine by high-speed video imaging of OH-chemiluminescence. Fuel and ambient-gas properties were varied during the experiment. Only a weak correlation was found between ignition delay and lift-off length. The data indicate that this correlation is due to a common, stronger correlation with the ambient oxygen concentration. The chemical ignition delay and the fuel type had similar, weak effects on the lift-off length. A recently proposed mechanism for lift-off stabilization was used to interpret the results. It assumes that reactants approaching the lift-off position of the jet are mixed with high-temperature products found along the edges of the flame, which trigger autoignition. In this picture, the fuel effect is most likely due to differences in the amount of mixing with high-temperature products that is required for autoignition. In the current experiment, all lift-off effects seem to arise from variations in the reactant and product temperatures, induced by fuel and ambient properties. (author)

Persson, Helena; Andersson, Oeivind; Egnell, Rolf [Lund University (Sweden). Dept. of Energy Sciences

2011-01-15

453

How Airplanes Fly: A Physical Description of Lift  

NSDL National Science Digital Library

This article by a physicist and an aeronautical engineer explains the physics of how aircraft wings produce lift. It shows how several popular explanations are clearly wrong, and then accounts for lift in terms of Newton's first and third laws without using calculus. The article also discusses power, drag, angle of attack, and wing vortices. Numerous drawings illustrate the ideas.

Anderson, David; Eberhardt, Scott

2011-12-28

454

Barbell-Lifting Based 3-D Wavelet Coding Scheme  

Microsoft Academic Search

This paper provides an overview of the Barbell lifting coding scheme that has been adopted as common software by the MPEG ad hoc group on further exploration of wavelet video coding. The core techniques used in this scheme, such as Barbell lifting, layered motion coding, 3D entropy coding and base layer embedding, are discussed. The paper also analyzes and compares

Ruiqin Xiong; Jizheng Xu; Feng Wu; Shipeng Li

2007-01-01

455

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

456

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

457

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

458

34. ALTERNATE DESIGN USING BATTERED AND UNSHEATHED LIFT TOWERS, WITH ...  

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

34. ALTERNATE DESIGN USING BATTERED AND UNSHEATHED LIFT TOWERS, WITH DEEPENED TRUSS ON LIFT SPAN. Pen-and-ink drawing by project architect Alfred Eichler, 1934. - Sacramento River Bridge, Spanning Sacramento River at California State Highway 275, Sacramento, Sacramento County, CA

459

Occupation and lymphoid neoplasms.  

PubMed Central

The relationship between occupation and exposure to a number of occupational agents and lymphoid neoplasms was investigated in a case-control study of 69 cases of Hodgkin's disease, 153 non-Hodgkin's lymphomas, 110 multiple myelomas and 396 controls admitted for acute diseases to a network of teaching and general hospitals in the greater Milan area. Among the cases, there was a significant excess of individuals ever occupied in agriculture and food processing: the multivariate relative risks (RR) were 2.1 (95% confidence interval, CI = 1.0-3.8) for Hodgkin's disease, 1.9 (95% CI = 1.2-3.0) for non-Hodgkin's lymphomas and 2.0 (95% CI = 1.1-3.5) for multiple myeloma. Significant trends for duration of exposure to herbicides were observed for lymphomas, but the association was stronger for overall occupation in agriculture than with the specific question of herbicide use. History of occupation in the chemical industry was more frequent among Hodgkin's disease (RR = 4.3, 95% CI = 1.4-10.2), and a significant trend in risk was observed between duration of exposure to benzene and other solvents and multiple myeloma. No significant relation was found between any of the lymphoid neoplasms considered and rubber, dye, painting, printing, tanning leather, photography, pharmaceuticals, wood, coal/gas and nuclear industries. PMID:2789947

La Vecchia, C.; Negri, E.; D'Avanzo, B.; Franceschi, S.

1989-01-01

460

Occupational Needs Assessment.  

ERIC Educational Resources Information Center

In order to determine community needs and preferences with regard to vocational education, the Cerritos Community College District surveyed 1,386 Cerritos College students, 896 students in area adult schools, 126 participants in regional occupational programs, and 258 community residents. A 46-item questionnaire focused on: (1) preferences for…

Stewart, Betsy

461

Hospitality Occupations. Curriculum Guide.  

ERIC Educational Resources Information Center

This curriculum guide on the hospitality occupations was developed to help secondary and postsecondary home economics teachers prepare individuals for entry-level jobs in the hospitality industry. The content is in seven sections. The first section presents organizational charts of a medium-size hotel, food and beverage division, housekeeping and…

California State Dept. of Education, Sacramento. Bureau of Homemaking Education.

462

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

463

Occupational Training in Industry.  

ERIC Educational Resources Information Center

A significant amount of on-the-job occupational training is occurring in the private sector, though the data on its extent and nature are extremely sketchy. Estimates of total economic costs in the 1974-75 period range from a crude measure of 100 billion dollars to one that is somewhat more reliable of about 40 to 50 billion dollars. Most of this…

Stromsdorfer, Ernst W.; Barclay, Suzanne

464

Occupational medicine for policing  

Microsoft Academic Search

A wide variety of medical conditions may be associated with police work. Unlike other occupations where a specific link can be traced between an exposure or an action and a specific pathology, the link between police work and disease is more problematic.The medical conditions which seem to be associated with police work are all conditions for which numerous other risk

A Trottier; J Brown

1995-01-01

465

Occupational Female Reproductive Hazards  

Microsoft Academic Search

The survival of a species depends on the integrity of its reproductive system. Damage by physical or chemical agents to the sperm, ovum or fertilised ovum may cause infertility, spontaneous abortion and birth defects, or may result in mutations that are passed on to future generations. When considering occupational exposures that may damage reproductive processes, the hazard to both men

Swati D. Jadav

2004-01-01

466

Occupationally Oriented IA  

ERIC Educational Resources Information Center

The occupationally oriented industrial arts program at Lee's Summit Senior High School, Missouri, offers general shop exploratory courses in multiple-activity laboratories at the ninth grade level, leading to unit general laboratory programs in grades 10 through 12 in drafting, wood, metals, basic electricity/electronics, and graphic…

Stone, Thurman L.

1977-01-01

467

Occupational Hazards of Farming  

PubMed Central

A number of occupational hazards exist for the farmer and farm worker. They include the hazards of farm machinery, biologic and chemical hazards, and social and environmental stresses. Recognizing of these hazards will help the family physician care for farmers and their families. PMID:21248929

White, Gill; Cessna, Allan

1989-01-01

468

Building Industries Occupations: Syllabus.  

ERIC Educational Resources Information Center

The Building Industries Occupations course is a two-year program of approximately 160 three-period teaching days per year. The required course content is designed to be effectively taught in 80 percent of the total course time, thus allowing 20 percent of the time for instruction adapted to such local conditions as employment prospects, student…

New York State Education Dept., Albany. Bureau of Secondary Curriculum Development.

469

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

470

Occupational hazards of farming.  

PubMed

A number of occupational hazards exist for the farmer and farm worker. They include the hazards of farm machinery, biologic and chemical hazards, and social and environmental stresses. Recognizing of these hazards will help the family physician care for farmers and their families. PMID:21248929

White, G; Cessna, A

1989-11-01

471

Occupational Therapist Assistants and Aides  

MedlinePLUS

... Offices of physical, occupational and speech therapists, and audiologists 35% Nursing and residential care facilities 22 Hospitals; ... Offices of physical, occupational and speech therapists, and audiologists 33% Hospitals; state, local, and private 32 Nursing ...

472

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

473

Occupational Injuries, Illnesses and Fatalities  

MedlinePLUS

... decade. More » Nonfatal Occupational Injuries and Illnesses Requiring Days Away From Work November 26, 2013 The rate ... PDF 62K) Nonfatal occupational injuries and illnesses requiring days away from work ( HTML ) ( PDF ) Archived Census of ...

474

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

475

17 CFR 3.64 - Procedure to lift or modify conditions or restrictions.  

Code of Federal Regulations, 2011 CFR

... 2011-04-01 false Procedure to lift or modify conditions or restrictions...Registration § 3.64 Procedure to lift or modify conditions or restrictions...petition on the Division of Enforcement to lift or modify conditions or restrictions...

2011-04-01

476

17 CFR 3.64 - Procedure to lift or modify conditions or restrictions.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 false Procedure to lift or modify conditions or restrictions...Registration § 3.64 Procedure to lift or modify conditions or restrictions...petition on the Division of Enforcement to lift or modify conditions or restrictions...

2010-04-01

477

17 CFR 3.64 - Procedure to lift or modify conditions or restrictions.  

Code of Federal Regulations, 2012 CFR

... 2012-04-01 false Procedure to lift or modify conditions or restrictions...Registration § 3.64 Procedure to lift or modify conditions or restrictions...petition on the Division of Enforcement to lift or modify conditions or restrictions...

2012-04-01

478

Numerical simulation of powered-lift flows  

NASA Technical Reports Server (NTRS)

This article presents work performed at NASA Ames involving the application of computational fluid dynamics (CFD) to the prediction of flows encountered by powered-lift aircraft operating in ground effect. These flows are characterized by jet and jet-induced flows interacting with the ground and aerodynamic surfaces. Over the last five years, work has progressed from simulating the interaction of a single jet impacting on a ground plane, through the simulation of a delta planform with multiple jets in ground effect, to an ongoing effort to simulate the complete flow about a Harrier AV-8B in ground effect. Efforts have also been made to predict the thermal interaction between hot propulsive jets and a landing surface of arbitrary thermal properties. Progress to data in each of these areas is outlined.

Van Dalsem, William R.; Chawla, Kalpana; Smith, Merritt H.; Abeloff, Patricia A.

1990-01-01

479

Theoretical investigations of high lift aerodynamics  

NASA Technical Reports Server (NTRS)

A program which generates a coordinate system for a two element airfoil with the mesh points concentrated in areas of significant vorticity, i.e., boundary layer and wake is operational. The 'imbedded' grid method developed allows a transition from the scale of the main airfoil to the scale of the flap. This requirement is essential for the modeling of viscous flows over the flap and slat of a multielement airfoil. An airfoil mounted in a 2-D wind tunnel was formulated. The program is ready for a fine grid and a large number of planes to explore the characteristics of a Navier-Stokes solver in a quasi-3D case. The program was converted to a form suitable for the STAR computer. Runs were made to map a three dimensional flow field for a wall airfoil intersection with and without lift.

Bennett, G.; Thompson, J.

1983-01-01

480

Numerical simulation of powered-lift flows  

NASA Technical Reports Server (NTRS)

This article presents work performed at NASA's Ames Research Center involving the application of Computational Fluid Dynamics (CFD) to the prediction of flows encountered by powered-lift aircraft operating in ground effect. These flows are characterized by jet and jet-induced flows interacting with the ground and aerodynamic surfaces. Over the last five years, work has progressed from simulating the interaction of a single jet impacting on a ground plane, through the simulation of a delta planform with multiple jets in ground effect, to an ongoing effort to simulate the complete flow about a Harrier AV-8B in ground effect. Efforts have also been made to predict the thermal interaction between hot propulsive jets and a landing surface of arbitrary thermal properties. Progress to date in each of these areas will be outlined.

Van Dalsem, William R.; Chawla, Kalpana; Smith, Merritt H.; Abeloff, Patricia A.

1990-01-01

481

Lifting 4d dualities to 5d  

E-print Network

In this paper we set out to further explore the connection between isolated N=2 SCFT's in four dimensions and N=1 SCFT's in five dimensions. Using 5-brane webs we are able to provide IR Lagrangian descriptions in terms of 5d gauge theories for several classes of theories including the so-called TN theories. In many of these we find multiple dual gauge theory descriptions. The connection to 4d theories is then used to lift 4d N=2 S-dualities that involve weakly-gauging isolated theories to 5d gauge theory dualities. The 5d description allows one to study the spectrum of BPS operators directly, using for example the superconformal index. This provides additional non-trivial checks of enhanced global symmetries and 4d dualities.

Oren Bergman; Gabi Zafrir

2014-10-10

482

Lifting 4d dualities to 5d  

E-print Network

In this paper we set out to further explore the connection between isolated N=2 SCFT's in four dimensions and N=1 SCFT's in five dimensions. Using 5-brane webs we are able to provide IR Lagrangian descriptions in terms of 5d gauge theories for several classes of theories including the so-called TN theories. In many of these we find multiple dual gauge theory descriptions. The connection to 4d theories is then used to lift 4d N=2 S-dualities that involve weakly-gauging isolated theories to 5d gauge theory dualities. The 5d description allows one to study the spectrum of BPS operators directly, using for example the superconformal index. This provides additional non-trivial checks of enhanced global symmetries and 4d dualities.

Bergman, Oren

2014-01-01

483

Breaking so(4) symmetry without degeneracy lift  

E-print Network

On the example of the quantum motion on S3, perturbed by the trigonometric Scarf potential (Scarf I) with one quantized and one continuous parameter, we argue that the breakdown by external scales of a Lie-algebraic symmetry of a quantum system must not necessarily amount to a lift of the degeneracies in the spectrum. To be specific, we show that though the spectrum under discussion carries hydrogen-like degeneracies, the corresponding wave functions do not transform according to so(4) carrier spaces but are finite linear combinations of so(4) representation functions describing carrier spaces of different dimensionality. Alternatively, these decompositions are also expansions in powers of the symmetry breaking scale, and allow to quantitatively describe the order to which the symmetry is violated. We conclude on the general possibility to break perturbatively an intact Lie algebraic symmetry, so(4) in our case, by external scales, such as the continuous parameter of Scarf I, and without leaving trace in the ...

Pallares-Rivera, A; Kirchbach, M

2013-01-01

484

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

2013-05-01

485

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

486

Psychophysical and physiological responses to lifting symmetrical and asymmetrical loads symmetrically and asymmetrically  

Microsoft Academic Search

Eighteen adult males (mean age 22·6 years, weight 78·6kg and height 176·6cm) participated in a study designed to investigate the effects of symmetrical and asymmetrical lifting on the maximum acceptable weight of lift and the resulting physiological cost. Each subject performed sixty different lifting tasks involving two lifting heights, three lifting frequencies and five containers. For each lifting task, the

ANIL MITAL; HAMID F. FARD

1986-01-01

487

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

488

Instructional Materials for Occupational Education.  

ERIC Educational Resources Information Center

The resource guide of instructional materials is one of two guides developed by 84 occupational education teachers in the State of New York, each experienced with the designated high school population. The assessment instrument developed to evaluate the occupational education materials is included. The occupational education materials are grouped…

State Univ. of New York, Ithaca. Cornell Inst. for Research and Development in Occupational Education.

489

Occupational Employment Projections through 1995.  

ERIC Educational Resources Information Center

Presents current and projected occupational employment estimates that were developed by industry and are part of a national industry-occupational employment matrix. The data from this matrix will be the basis of the information in the 1984-85 education of the Occupational Outlook Handbook to be issued in the Spring of 1984. (NRJ)

Silvestri, George T.; And Others

1983-01-01

490

Janet Craig Occupational Health Manager  

E-print Network

of Occupational Safety and Health Emerging trends - Government strategy for Health and Work Service Dame Carol, safety and wellbeing of staff and students · Review and develop Occupational Health support across20/02/2014 1 Janet Craig Occupational Health Manager RGN BSc RSCPHN(OH) 1556 1700 Bauer 1494

Schnaufer, Achim

491

2014OCCUPATIONAL & ENVIRONMENTAL MEDICINE SYMPOSIUM  

E-print Network

Davis Health System CA Poison Control Studies in Occupational and Environmental Toxicology Timur S2014OCCUPATIONAL & ENVIRONMENTAL MEDICINE SYMPOSIUM 32ND ANNUAL MAY 9-10, 2014 Friday, May 9th CreditsTM and ABPM MOC Credit The American College of Occupational and Environmental Medicine

Leistikow, Bruce N.

492

Anthropometric differences among occupational groups  

Microsoft Academic Search

The increasing demands for anthropometric information for the design of machinery and personal protective equipment to prevent occupational injuries has necessitated an understanding of the anthropometric differences to be found among occupations. This study identified differences in various body measurements between occupational groups in the USA, as determined in the third National Health and Nutrition Examination Survey. Approximately 16,000 of

Hongwei Hsiao; Daniel Long; Karl Snyder

2002-01-01

493

In-Flight Subsonic Lift and Drag Characteristics Unique to Blunt-Based Lifting Reentry Vehicles  

NASA Technical Reports Server (NTRS)

Lift and drag measurements have been analyzed for subsonic flight conditions for seven blunt-based reentry-type vehicles. Five of the vehicles are lifting bodies (M2-F1, M2-F2, HL-10, X-24A, and X-24B) and two are wing-body configurations (the X-15 and the Space Shuttle Enterprise). Base pressure measurements indicate that the base drag for full-scale vehicles is approximately three times greater than predicted by Hoerner's equation for three-dimensional bodies. Base drag and forebody drag combine to provide an optimal overall minimum drag (a drag "bucket") for a given configuration. The magnitude of this optimal drag, as well as the associated forebody drag, is dependent on the ratio of base area to vehicle wetted area. Counter-intuitively, the flight-determined optimal minimum drag does not occur at the point of minimum forebody drag, but at a higher forebody drag value. It was also found that the chosen definition for reference area for lift parameters should include the projection of planform area ahead of the wing trailing edge (i.e., forebody plus wing). Results are assembled collectively to provide a greater understanding of this class of vehicles than would occur by considering them individually.

Saltzman, Edwin J.; Wang, K. Charles; Iliff, Kenneth W.

2007-01-01