9,502 research outputs found
Hydrogen-methane fuel control systems for turbojet engines
Design, development, and test of a fuel conditioning and control system utilizing liquid methane (natural gas) and liquid hydrogen fuels for operation of a J85 jet engine were performed. The experimental program evaluated the stability and response of an engine fuel control employing liquid pumping of cryogenic fuels, gasification of the fuels at supercritical pressure, and gaseous metering and control. Acceptably stable and responsive control of the engine was demonstrated throughout the sea level power range for liquid gas fuel and up to 88 percent engine speed using liquid hydrogen fuel
Patent Protection for United States Inventions in the Principal European Countries - Existing Systems
Constructive Multiuser Interference in Symbol Level Precoding for the MISO Downlink Channel
This paper investigates the problem of interference among the simultaneous
multiuser transmissions in the downlink of multiple antennas systems. Using
symbol level precoding, a new approach towards the multiuser interference is
discussed along this paper. The concept of exploiting the interference between
the spatial multiuser transmissions by jointly utilizing the data information
(DI) and channel state information (CSI), in order to design symbol-level
precoders, is proposed. In this direction, the interference among the data
streams is transformed under certain conditions to useful signal that can
improve the signal to interference noise ratio (SINR) of the downlink
transmissions. We propose a maximum ratio transmission (MRT) based algorithm
that jointly exploits DI and CSI to glean the benefits from constructive
multiuser interference. Subsequently, a relation between the constructive
interference downlink transmission and physical layer multicasting is
established. In this context, novel constructive interference precoding
techniques that tackle the transmit power minimization (min power) with
individual SINR constraints at each user's receivers is proposed. Furthermore,
fairness through maximizing the weighted minimum SINR (max min SINR) of the
users is addressed by finding the link between the min power and max min SINR
problems. Moreover, heuristic precoding techniques are proposed to tackle the
weighted sum rate problem. Finally, extensive numerical results show that the
proposed schemes outperform other state of the art techniques.Comment: Submitted to IEEE Transactions on Signal Processin
Relaying Simultaneous Multicast Messages
The problem of multicasting multiple messages with the help of a relay, which
may also have an independent message of its own to multicast, is considered. As
a first step to address this general model, referred to as the compound
multiple access channel with a relay (cMACr), the capacity region of the
multiple access channel with a "cognitive" relay is characterized, including
the cases of partial and rate-limited cognition. Achievable rate regions for
the cMACr model are then presented based on decode-and-forward (DF) and
compress-and-forward (CF) relaying strategies. Moreover, an outer bound is
derived for the special case in which each transmitter has a direct link to one
of the receivers while the connection to the other receiver is enabled only
through the relay terminal. Numerical results for the Gaussian channel are also
provided.Comment: This paper was presented at the IEEE Information Theory Workshop,
Volos, Greece, June 200
Symbol Based Precoding in The Downlink of Cognitive MISO Channels
This paper proposes symbol level precoding in the downlink of a MISO
cognitive system. The new scheme tries to jointly utilize the data and channel
information to design a precoding that minimizes the transmit power at a
cognitive base station (CBS); without violating the interference temperature
constraint imposed by the primary system. In this framework, the data
information is handled at symbol level which enables the characterization the
intra-user interference among the cognitive users as an additional source of
useful energy that should be exploited. A relation between the constructive
multiuser transmissions and physical-layer multicast system is established.
Extensive simulations are performed to validate the proposed technique and
compare it with conventional techniques.Comment: CROWNCOM 201
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The effects of radiation damage and annealing on the diffusion of helium from zircon
The relationship between radiogenic ⁴He in zircon, and its associated radiation damage to the crystal lattice, have been of scientific interest since the earliest attempts at geochronology, and remain an active topic of research today in the pursuit of understanding the timing of low-temperature geological processes. Recently, the complex interrelationships between ⁴He diffusion kinetics, time, temperature, and radiation damage were quantified into a complete model for the zircon (U-Th)/He (ZHe) thermochronometric system: the Zircon Radiation Damage Accumulation and Annealing Model (ZRDAAM). Many researchers have taken issue with the predictions of this model, however, particularly at moderate to high radiation doses (~3 × 10¹⁷ – 2 × 10¹⁹ α/g). In this submission, the relationship between radiation damage and ⁴He diffusion kinetics are examined in greater detail to identify sources of discrepancy between observations and model predictions. Using zircons from three geologically distinct localities, this work represents the largest study on the diffusion kinetics of ⁴He from zircon to date, including 26 cycled step-heating analyses. A new behavior is observed in diffusion kinetics behavior, termed ‘rollover’: a thermally activated decrease in diffusivities, interpreted as low-temeprature annealing. Comparing the results of modeled and observed ZHe dating and step-heating analyses, we find significant discrepancies with model predictions in agreement with previous research. The source of these discrepancies is identified as low-temperature annealing, a process distinct from epitaxial recrystallization, resulting in significant effects on diffusional behavior, and not accounted for in the ZRDAAM. Results reveal that the damage threshold beyond which model diffusivities increase is too high, likely as a result of extensive prior geological annealing of the high-damage Sri Lankan zircons used to calibrate the ZRDAAM. Furthermore, the use of a single alpha dose appears inappropriate for capturing the full complexity of the ZHe system. Lastly, these results strongly suggest that the diffusion of ⁴He from zircon proceeds in a manner similar to a homogeneous gas, in spite of the fact that natural ⁴He concentrations are often strongly heterogeneous. This work is a significant step forward in the improvement of ZHe thermochronology, and will yield to the recovery of more accurate and robust thermal histories.Geological Science
What do communication skills mean in the construction discipline?
The establishment of academic standards in a number of disciplines has been the focus of an ongoing Australian Communication has emerged as one of the key threshold learning outcomes in the Australian Learning and Teaching Council (ALTC)-funded project (2010-2011) which established academic standards in a number of disciplines in Australian higher education institutions. However, it is far from clear what is meant by the term ?communication? in any of the disciplines, including the Construction discipline. This study examines the different understandings of communication skills in the Construction discipline that have emerged through thematic and concordance analysis of focus group discussions with the three major stakeholders in the discipline: faculty staff at several Australian universities, industry representatives, and students/recent graduates from Building & Construction degree programs. The findings show that each of the stakeholders has a different understanding of what communication encompasses, and that there are clear differences between the various higher education providers as to what communication is and how it can be developed in a degree program. The findings then beg the question: how are such skills to be taught and assessed in the context of the discipline
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