PubMed Journals Articles About "NASA Extends Aircraft Maintenance Contract" RSS

04:24 EDT 2nd October 2014 | BioPortfolio

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Showing "NASA Extends Aircraft Maintenance Contract" PubMed Articles 1–25 of 2,600+

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Aircraft noise and speech intelligibility in an outdoor living space.

Studies of effects on speech intelligibility from aircraft noise in outdoor places are currently lacking. To explore these effects, first-order ambisonic recordings of aircraft noise were reproduced outdoors in a pergola. The average background level was 47 dB LA eq. Lists of phonetically balanced words (LAS max,word = 54 dB) were reproduced simultaneously with aircraft passage noise (LAS max,noise = 72-84 dB). Twenty individually tested listeners wrote down each presented word while seated in...


Subjective Evaluation of Physical and Mental Workload Interactions across Different Muscle Groups.

ABSTRACT Both physical and mental demands, and their interactions, have shown to increase biomechanical loading and physiological reactivity, as well as impair task performance. Because these interactions have shown to be muscle-dependent, the aim of this study was to determine the sensitivity of the NASA Task Load Index (NASA TLX) and Ratings of Perceived Exertion (RPE) to evaluate physical and mental workload during muscle-specific tasks. Twenty-four participants performed upper extremity and low back exe...

Augmented reality for aircraft maintenance training and operations support.

Recent statistics on causes of aviation accidents and incidents demonstrate that to increase air-transportation safety, we must reduce human errors' impact on operations. So, the industry should first address human factors related to people in stressful roles to significantly minimize such errors. In particular, aviation maintenance employees work under high-pressure conditions- that is, they're under strict time constraints and must adhere to stringent guidelines. Because of such constraints, they might be...

Some health effects of aircraft noise with special reference to shift work.

Aircraft noise is an environmental stressor. A positive relationship exists between noise and high blood pressure. Shift work is an additional hazardous working condition with negative effect on the behavior attitude of workers.


Cancer incidence and mortality among temporary maintenance workers in a refinery/petrochemical complex in Korea.

Background: Petrochemical plant maintenance workers are exposed to various carcinogens such as benzene and metal fumes. In Korea, maintenance operations in petrochemical plants are typically performed by temporary employees hired as contract workers. Objectives: The purpose of this retrospective study was to evaluate cancer risk in temporary maintenance workers in a refinery/petrochemical complex in Korea. Methods: Subjects consisted of 14 698 male workers registered in a regional petrochemical plant mainte...

Federal Investigative Report Questions 340B Contract Pharmacy Programs: Office of Pharmacy Affairs Promises Regulatory Response.

Investigators question 340B contract pharmacy programs.

Experimental evaluation of shark detection rates by aerial observers.

Aerial surveys are a recognised technique to identify the presence and abundance of marine animals. However, the capability of aerial observers to reliably sight coastal sharks has not been previously assessed, nor have differences in sighting rates between aircraft types been examined. In this study we investigated the ability of observers in fixed-wing and helicopter aircraft to sight 2.5 m artificial shark analogues placed at known depths and positions. Initial tests revealed that the shark analogues cou...

Weather features associated with aircraft icing conditions: a case study.

In the context of aviation weather hazards, the study of aircraft icing is very important because of several accidents attributed to it over recent decades. On February 1, 2012, an unusual meteorological situation caused severe icing of a C-212-200, an aircraft used during winter 2011-2012 to study winter cloud systems in the Guadarrama Mountains of the central Iberian Peninsula. Observations in this case were from a MP-3000A microwave radiometric profiler, which acquired atmospheric temperature and humidit...

The application of magnetic measurements for the characterization of atmospheric particulate pollution within the airport environment.

The significant increase in global air travel which has occurred during the last fifty years has generated growing concern regarding the potential impacts associated with increasing emissions of atmospheric particulate matter (PM) on health and the environment. PM within the airport environment may be derived from a range of sources. To date, however, the identification of individual sources of airport derived PM has remained elusive but constitutes a research priority for the aviation industry. The aim of ...

In-Flight Alignment Using H ∞ Filter for Strapdown INS on Aircraft.

In-flight alignment is an effective way to improve the accuracy and speed of initial alignment for strapdown inertial navigation system (INS). During the aircraft flight, strapdown INS alignment was disturbed by lineal and angular movements of the aircraft. To deal with the disturbances in dynamic initial alignment, a novel alignment method for SINS is investigated in this paper. In this method, an initial alignment error model of SINS in the inertial frame is established. The observability of the system is...

NASA to Researchers: Sell Your Mission or Be Terminated.

Outcome evaluation of the opioid agonist maintenance treatment in Iran.

Methadone maintenance treatment and buprenorphine maintenance treatment are the two main therapeutic options considered for opioid replacement therapy. This study was conducted to examine the effectiveness of methadone maintenance treatment and buprenorphine maintenance treatment in Iran under usual clinical conditions.

Nurse employment contracts in Chinese hospitals: impact of inequitable benefit structures on nurse and patient satisfaction.

Purpose: Ongoing economic and health system reforms in China have transformed nurse employment in Chinese hospitals. Employment of 'bianzhi' nurses, a type of position with state-guaranteed lifetime employment that has been customary since 1949, is decreasing while there is an increase in the contract-based nurse employment with limited job security and reduced benefits. The consequences of inequities between the two types of nurses in terms of wages and job-related benefits are unknown. This study examined...

A comprehensive robust adaptive controller for gust load alleviation.

The objective of this paper is the implementation and validation of an adaptive controller for aircraft gust load alleviation. The contribution of this paper is the design of a robust controller that guarantees the reduction of the gust loads, even when the nominal conditions change. Some preliminary results are presented, considering the symmetric aileron deflection as control device. The proposed approach is validated on subsonic transport aircraft for different mass and flight conditions. Moreover, if th...

Update on the Evidence Regarding Maintenance Therapy.

Maintenance therapy has emerged as a novel therapeutic paradigm for advanced non-small-cell lung cancer (NSCLC). Maintenance therapy that aims to sustain a clinically favorable state after first-line chemotherapy has two strategies. Switch maintenance therapy entails switching to a new and non-cross-resistant agent in an alternating or sequential manner, on completion of first-line chemotherapy. Continuous maintenance therapy keeps ongoing administration of a component of the current regimen after four to s...

Planetary science. NASA planners gear up for martian sample return.

In the Neighborhood: Metabolic Outcomes among Residents Exposed to Aircraft Noise.

The generation contract, pension schemes, birth control and economic growth: A European model for the third world?

The paper presents an analysis of the relationship between the generation contract, pension schemes, fertility decline and the process of economic growth. It is shown that there is a close connection between the reproductive behavior of a population and social security in old age i.e. the introduction and effects of retirement insurances. The proof of this assumption is given by a historical analysis of the developed and a systematic analysis of the developing countries. The paper postulates that the intent...

Evacuation pattern analysis of a survivable commercial aircraft crash.

Frequency of Interactions and Hand Disinfections among Anesthesiologists While Providing Anesthesia Care in the Operating Room: Induction versus Maintenance.

We evaluated the behaviors of anesthesiologists during induction and maintenance of anesthesia. Contacts with surfaces occurred a mean (±standard error) of 154.8 ± 7.7 and 60 ± 3.1 times per hour during induction and maintenance, respectively (P < .0001). Hand hygiene events were 1.8 ± 0.27 per hour during induction versus 1.19 ± 0.27 during maintenance (P = .018).

Maintenance therapy in ovarian cancer.

Targeted therapies are being used as maintenance therapy to improve the outcome of ovarian cancer following standard treatment in the first-line setting and in recurrent disease. We review the different approaches being used, trial design, and the impact of maintenance treatment on survival and quality of life.

Potential global jamming transition in aviation networks.

In this paper, we propose a nonlinear transport model for an aviation network. The takeoff rate from an airport is characterized by the degree of ground congestion. Due to the effect of surface congestion, the performance of an airport deteriorates because of inefficient configurations of waiting aircraft on the ground. Using a simple transport model, we performed simulations on a United States airport network and found a global jamming transition induced by local surface congestion. From a physical perspec...

Reproductive Tissue and Contract.

Buprenorphine maintenance versus placebo or methadone maintenance for opioid dependence.

Buprenorphine maintenance treatment has been evaluated in randomised controlled trials against placebo medication, and separately as an alternative to methadone for management of opioid dependence.

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