The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform

Nasa - One of the best experts on this subject based on the ideXlab platform.

  • Fracture control requirements for Payloads using the National Space Transportation System (NSTS)
    2019
    Co-Authors: Nasa
    Abstract:

    The purpose of this document is to establish the fracture control requirements for all Payload hardware to be launched or retrieved using the National Space Transportation System (NSTS). Meeting these requirements implements the minimum fracture control requirements of NHB 1700.7, 'Safety Policy and Requirements for Payloads Using the Space Transportation System (STS).' All NSTS Payload fracture control shall be in accordance with the requirements stated herein.

  • STS-39: Payloads in Cannister at VPF
    2017
    Co-Authors: Nasa
    Abstract:

    Discovery spent about 15 weeks in the processing facility undergoing about 22 modifications and routine testing. Shown are STS-39 primary Payloads installed in Discovery's Payload bay in the Orbiter Processing Facility (OPF). Payloads installed in the OPF include the Critical Ionization Velocity Payload and the Chemical Release Observatory.

  • Application of Shuttle EVA Systems to Payloads. Volume 2: Payload EVA Task Completion Plans
    2014
    Co-Authors: Nasa
    Abstract:

    Candidate Payload tasks for EVA application were identified and selected, based on an analysis of four representative space shuttle Payloads, and typical EVA scenarios with supporting crew timelines and procedures were developed. The EVA preparations and post EVA operations, as well as the timelines emphasizing concurrent Payload support functions, were also summarized.

  • Safety policy and requirements for Payloads using the Space Transportation System (STS)
    2013
    Co-Authors: Nasa
    Abstract:

    The Space Transportation Operations (STO) safety policy is to minimize STO involvement in the Payload and its GSE (ground support equipment) design process while maintaining the assurance of a safe operation. Requirements for assuring Payload mission success are the responsibility of the Payload organization and are beyond the scope of this document. The intent is to provide the overall safety policies and requirements while allowing for negotiation between the Payload organization and the STO operator in the method of implementation of Payload safety. This revision provides for a relaxation in the monitoring requirements for inhibits, allows the Payload organization to pursue design options and reflects, additionally, some new requirements. As of the issue date of this NHB, Payloads which have completed the formal safety assessment reviews of their preliminary design on the basis of the May 1979 issue will be reassessed for compliance with the above changes.

  • The October 1973 NASA mission model analysis and economic assessment
    2013
    Co-Authors: Nasa
    Abstract:

    Results are presented of the 1973 NASA Mission Model Analysis. The purpose was to obtain an economic assessment of using the Shuttle to accommodate the Payloads and requirements as identified by the NASA Program Offices and the DoD. The 1973 Payload Model represents a baseline candidate set of future Payloads which can be used as a reference base for planning purposes. The cost of implementing these Payload programs utilizing the capabilities of the shuttle system is analyzed and compared with the cost of conducting the same Payload effort using expendable launch vehicles. There is a net benefit of 14.1 billion dollars as a result of using the shuttle during the 12-year period as compared to using an expendable launch vehicle fleet.

Erika Gupta - One of the best experts on this subject based on the ideXlab platform.

  • techno economic analysis of conventional and advanced high pressure tube trailer configurations for compressed hydrogen gas transportation and refueling
    International Journal of Hydrogen Energy, 2018
    Co-Authors: Krishna Reddi, Neha Rustagi, Amgad Elgowainy, Erika Gupta
    Abstract:

    Abstract Transporting compressed gaseous hydrogen in tube trailers to hydrogen refueling stations (HRSs) is an attractive economic option in early fuel cell electric vehicle (FCEV) markets. This study examines conventional (Type I, steel) and advanced (Type IV, composite) high-pressure tube trailer configurations to identify those that offer maximum Payload and lowest cost per unit of deliverable Payload under United States Department of Transportation (DOT) size and weight constraints. The study also evaluates the impacts of various tube trailer configurations and Payloads on the transportation and refueling cost of hydrogen under various transportation distance and HRS capacity scenarios. Composite tube trailers can transport large hydrogen Payloads, up to 1100 kg at 7300 psi (500 bar) working pressure, while steel tube trailer configurations are limited by DOT weight regulations and may transport a maximum hydrogen Payload of approximately 270 kg. Using steel pressure vessels to transport hydrogen at high pressure is counterproductive because of the rapid increase in vessel weight with wall thickness. The most economic composite tube trailer configuration includes 30-inch-diameter vessels packed in a 3 × 3 array. A linear relationship between the deliverable Payload and the capital cost of a composite tube trailer has been developed for configurations with the lowest cost-per-unit Payload. The capital cost is approximately $1100 per kg of deliverable hydrogen Payload. Considering the entire delivery pathway (including refueling), tube trailer configurations with smaller vessels packed in greater numbers enable higher Payload delivery and lower delivery cost in terms of $/kg H2, when delivering hydrogen over longer distances to large stations. Selection of the appropriate tube trailer configuration and corresponding hydrogen Payload can reduce hydrogen delivery cost by up to 16%.

Julie N. Sanchez - One of the best experts on this subject based on the ideXlab platform.

  • International Space Station Payload Training Overview
    2001 Conference and Exhibit on International Space Station Utilization, 2001
    Co-Authors: Deborah B. Underwood, Steven R. Noneman, Julie N. Sanchez
    Abstract:

    This paper describes Payload crew training-related activities performed by NASA and the U.S. Payload Developer (PD) community for the International Space Station (ISS) Program. It describes how Payloads will be trained and the overall training planning and integration process. The overall concept, definition, and template for Payload training are described. The roles and responsibilities of individuals, organizations, and groups involved are discussed. The facilities utilized during Payload training and the primary processes and activities performed to plan, develop, implement, and administer Payload training for ISS crews are briefly described. Areas of improvement to crew training processes that have been achieved or are currently being worked are identified.

Krishna Reddi - One of the best experts on this subject based on the ideXlab platform.

  • techno economic analysis of conventional and advanced high pressure tube trailer configurations for compressed hydrogen gas transportation and refueling
    International Journal of Hydrogen Energy, 2018
    Co-Authors: Krishna Reddi, Neha Rustagi, Amgad Elgowainy, Erika Gupta
    Abstract:

    Abstract Transporting compressed gaseous hydrogen in tube trailers to hydrogen refueling stations (HRSs) is an attractive economic option in early fuel cell electric vehicle (FCEV) markets. This study examines conventional (Type I, steel) and advanced (Type IV, composite) high-pressure tube trailer configurations to identify those that offer maximum Payload and lowest cost per unit of deliverable Payload under United States Department of Transportation (DOT) size and weight constraints. The study also evaluates the impacts of various tube trailer configurations and Payloads on the transportation and refueling cost of hydrogen under various transportation distance and HRS capacity scenarios. Composite tube trailers can transport large hydrogen Payloads, up to 1100 kg at 7300 psi (500 bar) working pressure, while steel tube trailer configurations are limited by DOT weight regulations and may transport a maximum hydrogen Payload of approximately 270 kg. Using steel pressure vessels to transport hydrogen at high pressure is counterproductive because of the rapid increase in vessel weight with wall thickness. The most economic composite tube trailer configuration includes 30-inch-diameter vessels packed in a 3 × 3 array. A linear relationship between the deliverable Payload and the capital cost of a composite tube trailer has been developed for configurations with the lowest cost-per-unit Payload. The capital cost is approximately $1100 per kg of deliverable hydrogen Payload. Considering the entire delivery pathway (including refueling), tube trailer configurations with smaller vessels packed in greater numbers enable higher Payload delivery and lower delivery cost in terms of $/kg H2, when delivering hydrogen over longer distances to large stations. Selection of the appropriate tube trailer configuration and corresponding hydrogen Payload can reduce hydrogen delivery cost by up to 16%.

Daniel J. Blumenthal - One of the best experts on this subject based on the ideXlab platform.

  • Integrated optical Payload envelope detection and label recovery device for optical packet switching networks.
    Optics express, 2006
    Co-Authors: Brian R. Koch, Zhaoyang Hu, John E Bowers, Daniel J. Blumenthal
    Abstract:

    We demonstrate an integrated device for optical Payload envelope detection and optical label recovery for optical packet switching. The device is designed to handle asynchronous serially labeled packets with variable length 40 Gbps Payloads preceded by 10 Gbps labels. The device outputs two signals: 1. a Payload envelope signal corresponding to the temporal location and duration of the optical Payload and 2. an electrical label recovered from the optical label. The Payload envelope signal has rise and fall times of 3 ns with 150 ps RMS jitter and is used to perform error free label erasure and rewriting. Error free label recovery is also demonstrated.

  • All-optical Payload envelope detection for variable length 40-gb/s optically labeled packets
    IEEE Photonics Technology Letters, 2006
    Co-Authors: Brian R. Koch, John E Bowers, Daniel J. Blumenthal
    Abstract:

    We demonstrate a new technique to all-optically identify the precise temporal locations and durations of the Payloads of optical packets consisting of a variable length 40-Gb/s return-to-zero Payload and 10-Gb/s nonreturn-to-zero label. The all-optically generated Payload envelope signal can be used to erase the original optical label and rewrite a new label. The recovered Payload envelope has 300-ps rise time and edge root-mean-square average jitter of 30 ps over a 10-dB dynamic range of input optical packet power. These numbers indicate that this technique enables the use of very short guard bands between Payloads. The technique is demonstrated using optical semiconductor devices that are straightforward to monolithically integrate on a single chip