Computer Support in the Design and Testing of Undersea Towed Systems

1974 ◽  
Vol 11 (02) ◽  
pp. 159-172
Author(s):  
John D. Burroughs ◽  
Raymond C. Benz
Keyword(s):  
System Analysis ◽  
State Of The Art ◽  
Equations Of Motion ◽  
Computer Support ◽  
Current State ◽  
Engineering Problems ◽  
Practical Engineering ◽  
High Degree ◽  
Design And Testing ◽  
Made In

Since 1965 the authors' company has developed, assembled, and applied a computer simulation to the problem of analyzing the static and dynamic behavior of underwater towed systems. As a result of a recent survey [16]3 of towed system dynamic analysis literature, it became apparent that other investigators in the field of towed system analysis were either completely unaware of this work or had only a very superficial knowledge of it. It is a purpose of this paper to describe the modeling approach taken for the towed system and to present the methods used to derive the equations of motion for the model. Assumptions that were made in order to achieve practical solutions to the equations of motion also are discussed. A high degree of correlation with actual towing trials has been achieved by this analysis and it has been demonstrated that practical engineering problems can be solved using such a simulation tool. The computer support provided in 1970 to underway sea trials of a hydrofoil towed system is presented and discussed. It is believed that this simulation represents the current state of the art in towed system simulation.

Developments in Rechargeable Mno2Electrodes for Lithium Batteries

1988 ◽  
Vol 135 ◽  
Author(s):  
Michael M Thackeray
Keyword(s):  
Lithium Batteries ◽  
Lithium Battery ◽  
Electrode Materials ◽  
State Of The Art ◽  
Structural Features ◽  
Rechargeable Batteries ◽  
Current State ◽  
Alternative Systems ◽  
Battery Technology ◽  
Made In

AbstractConsiderable efforts are in progress to develop rechargeable batteries as alternative systems to the nickel-cadmium battery. In this regard, several advances have been made in ambient-temperature lithium battery technology, and specifically in the engineering of rechargeable lithium/manganese dioxide cells. This paper reviews the current state of the art in rechargeable Li/MnO2battery technology; particular attention is paid to the structural features of various MnO2electrode materials which influence their electrochemical and cycling behaviour in lithium cells.

Optimal Passive Damper Positioning Techniques

2013 ◽  
pp. 85-111 ◽  
Author(s):  
Arun M. Puthanpurayil ◽  
Rajesh P Dhakal ◽  
Athol J. Carr
Keyword(s):  
Seismic Event ◽  
State Of The Art ◽  
Sensitivity Study ◽  
Optimal Distribution ◽  
Comparative Sensitivity ◽  
Numerical Studies ◽  
Current State ◽  
Passive Damper ◽  
Damping Model ◽  
Made In

A consolidated review of the current-state-of-the-art on optimal damper positioning techniques is presented in this chapter. The inherent assumptions made in previous research are discussed and substantiated with numerical studies. Earlier studies have shown that optimal distribution of dampers is sensitive to in-structure damping. In this chapter the significance of optimal distribution of dampers coupled with the necessity for the use of a more realistic in-structure damping model is qualitatively illustrated using a comparative sensitivity study. The effect of inherent assumption of linearity of the parent frame on the ‘optimality’ is also investigated. It is shown that linearity assumption imposed on the parent frame in a major seismic event may not be justified; thereby raising doubts on the scope of optimality techniques proposed in literature.

scholarly journals Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures

2020 ◽  
Vol 201 (5-6) ◽  
pp. 772-802 ◽  
Author(s):  
A. T. Jones ◽  
C. P. Scheller ◽  
J. R. Prance ◽  
Y. B. Kalyoncu ◽  
D. M. Zumbühl ◽  
...  
Keyword(s):  
State Of The Art ◽  
Electronic Devices ◽  
Bulk Materials ◽  
Nanoelectronic Devices ◽  
Current State ◽  
Physical Effects ◽  
On Chip ◽  
Nanoscale Physics ◽  
A Current ◽  
Made In

AbstractHere we review recent progress in cooling micro-/nanoelectronic devices significantly below 10 mK. A number of groups worldwide are working to produce sub-millikelvin on-chip electron temperatures, motivated by the possibility of observing new physical effects and improving the performance of quantum technologies, sensors and metrological standards. The challenge is a longstanding one, with the lowest reported on-chip electron temperature having remained around 4 mK for more than 15 years. This is despite the fact that microkelvin temperatures have been accessible in bulk materials since the mid-twentieth century. In this review, we describe progress made in the last 5 years using new cooling techniques. Developments have been driven by improvements in the understanding of nanoscale physics, material properties and heat flow in electronic devices at ultralow temperatures and have involved collaboration between universities and institutes, physicists and engineers. We hope that this review will serve as a summary of the current state of the art and provide a roadmap for future developments. We focus on techniques that have shown, in experiment, the potential to reach sub-millikelvin electron temperatures. In particular, we focus on on-chip demagnetisation refrigeration. Multiple groups have used this technique to reach temperatures around 1 mK, with a current lowest temperature below 0.5 mK.

scholarly journals Insight and psychosis: the next 30 years

2019 ◽  
Vol 217 (3) ◽  
pp. 521-523 ◽  
Author(s):  
Anthony S. David
Keyword(s):  
Conceptual Development ◽  
State Of The Art ◽  
Involuntary Treatment ◽  
The Past ◽  
Current State ◽  
Decision Making Capacity ◽  
Cognitive Neurosciences ◽  
Clinical Associations ◽  
The Relationship ◽  
Made In

Academic interest in the concept of insight in psychosis has increased markedly over the past 30 years, prompting this selective appraisal of the current state of the art. Considerable progress has been made in terms of measurement and confirming a number of clinical associations. More recently, the relationship between insight and involuntary treatment has been scrutinised more closely alongside the link between decision-making capacity and insight. Advances in the clinical and cognitive neurosciences have influenced conceptual development, particularly the field of ‘metacognition’. New therapies, including those that are psychologically and neurophysiologically based, are being tested as ways to enhance insight.

Synthesis and applications of CdSe nano-tetrapods in hybrid photovoltaic devices

2012 ◽  
Vol 84 (12) ◽  
pp. 2549-2558 ◽  
Author(s):  
Lijuan Zhao ◽  
Linfeng Hu
Keyword(s):  
State Of The Art ◽  
Chloroform Solution ◽  
Photovoltaic Devices ◽  
Direct Band Gap ◽  
Field Emitters ◽  
Current State ◽  
Photovoltaic Applications ◽  
Direct Band ◽  
Remarkable Progress ◽  
Made In

Tetrapod-shaped nanocrystals have attracted increasing interest for optoelectronic applications in recent years due to their rich morphologies. With unique properties such as a direct band-gap and excellent photoelectrical characteristics, CdSe nano-tetrapods are promising nanostructures for applications in such fields as photodetectors, field emitters, and photovoltaic devices. This review mainly describes the remarkable progress made in synthesis and hybrid photovoltaic applications of CdSe nano-tetrapods over the last few years. In particular, the “blinking” effect observed from these nano-tetrapods in chloroform solution is highlighted. This overview covers the current state of the art as well as an outlook on possibilities and limitations.

scholarly journals Towards FAIR Data for Low Carbon Energy - Current State and Call for Action

2021 ◽  
Author(s):  
Valeria Jana Schwanitz ◽  
August Wierling ◽  
Mehmet Biresselioglu ◽  
Massimo Celino ◽  
Muhittin Demir ◽  
...  
Keyword(s):  
State Of The Art ◽  
Energy Transition ◽  
Low Carbon ◽  
Energy Current ◽  
Data Practices ◽  
Current State ◽  
Energy Domain ◽  
Scholarly Data ◽  
Low Carbon Energy ◽  
Made In

Abstract With the continued digitization of the energy sector, the problem of sunken scholarly data investments and forgone opportunities of harvesting existing data is exacerbating. It adds to the problem that the reproduction of knowledge is incomplete, impeding the transparency of science-based evidence for the choices made in the energy transition. We comprehensively test FAIR data practices in the energy domain with the help of automated and manual tests. We document the state-of-the art and provide insights on bottlenecks from the human and machine perspectives. We propose action items for overcoming the problem with FAIR and open energy data and suggest how to prioritize activities.

You Need Teachers

PEDIATRICS ◽  
1979 ◽  
Vol 64 (1) ◽  
pp. 125-125
Author(s):  
Miles Weinberger
Keyword(s):  
State Of The Art ◽  
Review Article ◽  
Current State ◽  
Children With Asthma ◽  
Degree Of Control ◽  
Considerable Morbidity ◽  
High Degree ◽  
Changing Role ◽  
Excellent Review Article

The excellent review article by Leffert1 and the accompanying commentary by Bergner2 made important points regarding the changing role of the pediatric allergist and the broad requirements for knowledge of any physicians who are to provide specialty care for children with asthma. While the current state of the art allows a high degree of control for this disease,3 considerable morbidity from inadequately treated asthma persists. This situation is unlikely to change rapidly unless departments of pediatrics place a high priority on ensuring that the modern allergist described by Dr. Bergner is on their faculty to teach the current housestaff and provide continuing education for the practitioner; only then will most general pediatricians be able to assume the role envisioned by Dr. Leffert.

Nonlinear optical devices: Relative Status of Polymeric Materials

1991 ◽  
Vol 228 ◽  
Author(s):  
George I. Stegeman
Keyword(s):  
Nonlinear Optical ◽  
Organic Materials ◽  
State Of The Art ◽  
Polymeric Materials ◽  
Nonlinear Optical Devices ◽  
Current State ◽  
Device Applications ◽  
Relative Status ◽  
Nonlinear Optical Phenomena ◽  
Made In

ABSTRACTNonlinear optical phenomena have been investigated over the last three decades in many different materials and a great deal of progress has been made in both the basic science and device applications.(1] Although interest in nonlinear organic materials dates back to the early days of nonlinear optics, it is only in the last five years that progress has been sustained and rapid. The purpose of this paper is to examine progress in developing new nonlinear organic materials and in their application to devices for comparison with current state-of-the-art devices using other material systems.

scholarly journals Magnetotactic Bacteria and Magnetosomes: Basic Properties and Applications

2021 ◽  
Vol 7 (6) ◽  
pp. 86
Author(s):  
Kamil G. Gareev ◽  
Denis S. Grouzdev ◽  
Petr V. Kharitonskii ◽  
Andrei Kosterov ◽  
Veronika V. Koziaeva ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Biomedical Applications ◽  
State Of The Art ◽  
Rock Magnetism ◽  
Magnetotactic Bacteria ◽  
Resonance Imaging ◽  
Current State ◽  
Magnetite Fe3o4 ◽  
High Degree ◽  
Potential Use

Magnetotactic bacteria (MTB) belong to several phyla. This class of microorganisms exhibits the ability of magneto-aerotaxis. MTB synthesize biominerals in organelle-like structures called magnetosomes, which contain single-domain crystals of magnetite (Fe3O4) or greigite (Fe3S4) characterized by a high degree of structural and compositional perfection. Magnetosomes from dead MTB could be preserved in sediments (called fossil magnetosomes or magnetofossils). Under certain conditions, magnetofossils are capable of retaining their remanence for millions of years. This accounts for the growing interest in MTB and magnetofossils in paleo- and rock magnetism and in a wider field of biogeoscience. At the same time, high biocompatibility of magnetosomes makes possible their potential use in biomedical applications, including magnetic resonance imaging, hyperthermia, magnetically guided drug delivery, and immunomagnetic analysis. In this review, we attempt to summarize the current state of the art in the field of MTB research and applications.

scholarly journals A Review of Stochastic Programming Methods for Optimization of Process Systems Under Uncertainty

2021 ◽  
Vol 2 ◽  
Author(s):  
Can Li ◽  
Ignacio E. Grossmann
Keyword(s):  
Stochastic Programming ◽  
Systems Engineering ◽  
State Of The Art ◽  
Mathematical Framework ◽  
Process Systems Engineering ◽  
Process Industries ◽  
Process Systems ◽  
Current State ◽  
Engineering Problems ◽  
High Level

Uncertainties are widespread in the optimization of process systems, such as uncertainties in process technologies, prices, and customer demands. In this paper, we review the basic concepts and recent advances of a risk-neutral mathematical framework called “stochastic programming” and its applications in solving process systems engineering problems under uncertainty. This review intends to provide both a tutorial for beginners without prior experience and a high-level overview of the current state-of-the-art developments for experts in process systems engineering and stochastic programming. The mathematical formulations and algorithms for two-stage and multistage stochastic programming are reviewed with illustrative examples from process industries. The differences between stochastic programming under exogenous uncertainty and endogenous uncertainties are discussed. The concepts and several data-driven methods for generating scenario trees are also reviewed.

Sign in / Sign up

Export Citation Format

Share Document