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2016 in American Journal of Physics [IF: 1.03]
Seth DeVore3
Estimated H-index: 3
,
Alexandre Gauthier2
Estimated H-index: 2
,
Jeremy Levy28
Estimated H-index: 28
... more
The lock-in amplifier is a versatile instrument frequently used in physics research. We find that students tend to struggle with its basic operating principles, leading to a variety of difficulties. To improve their understanding, we have developed a research-based tutorial that makes use of a computer simulated lock-in amplifier. The tutorial allows students to realize their conceptual difficulties by comparing their predictions with the outcome of the simulations, hopefull...
5 Citations Download PDF Cite
Valentina Lombardi4
Estimated H-index: 4
,
Claudia Adduce17
Estimated H-index: 17
,
Michele La Rocca10
Estimated H-index: 10
ABSTRACTThe dynamics of unconfined gravity currents generated by a lock-exchange with different lock widths is considered. The gravity currents were generated by density differences caused by a salinity gradient and were realized both numerically and experimentally. Several runs were carried out in order to study the role played by the lock width in the current dynamics. Numerical simulations were performed with a new single-layer, 2D, shallow-water model, which accounts for...
5 Citations Source Cite
Jia Liu2
Estimated H-index: 2
(University of Surrey),
Tibor Jager16
Estimated H-index: 16
(University of Paderborn),
Saqib A. Kakvi2
Estimated H-index: 2
(University of Paderborn)
... more
Time-lock encryption is a method to encrypt a message such that it can only be decrypted after a certain deadline has passed. We propose a novel time-lock encryption scheme, whose main advantage over prior constructions is that even receivers with relatively weak computational resources should immediately be able to decrypt after the deadline, without any interaction with the sender, other receivers, or a trusted third party. We build our time-lock encryption on top of the n...
8 Citations Source Cite
2014 in Drug Testing and Analysis [IF: 2.99]
Franz E. Dussy5
Estimated H-index: 5
,
Nicholas Carson1
Estimated H-index: 1
,
Sarah Hangartner2
Estimated H-index: 2
... more
When investigating someone's hair a single lock is cut, washed, extracted and analysed. The forensic institutes in Switzerland agreed to retain a second lock for a possible reassessment. We were interested in the reproducibility of the concentrations of analytes in hair locks taken from different areas of the head of the same person covering the same time period. Therefore we analysed ethyl glucuronide and caffeine as model substances in 10 hair locks from three individuals categor...
10 Citations Source Cite
2011 in IEEE Sensors Journal [IF: 2.62]
Sergi Foix8
Estimated H-index: 8
(Polytechnic University of Catalonia),
Guillem Alenyà5
Estimated H-index: 5
(Polytechnic University of Catalonia),
Carme Torras25
Estimated H-index: 25
(Polytechnic University of Catalonia)
This paper reviews the state-of-the art in the field of lock-in time-of-flight (ToF) cameras, their advantages, their limitations, the existing calibration methods, and the way they are being used, sometimes in combination with other sensors. Even though lock-in ToF cameras provide neither higher resolution nor larger ambiguity-free range compared to other range map estimation systems, advantages such as registered depth and intensity data at a high frame rate, compact design, low ...
255 Citations Download PDF Cite
Richard L. Leimbach11
Estimated H-index: 11
,
Iv Thomas W. Lytle5
Estimated H-index: 5
,
Wendy A. Kerr8
Estimated H-index: 8
... more
A surgical instrument can comprise a handle, a shaft extending from the handle, and an end effector rotatably coupled to the shaft by an articulation joint. The surgical instrument can further include an articulation driver configured to rotate the end effector about the articulation joint and an articulation lock which can be configured to selectably resist the unintentional articulation of the end effector. In various circumstances, the actuation of the articulation driver can unlock th...
242 Citations Source
2016 in Engineering Failure Analysis [IF: 2.16]
Wei Guo1
Estimated H-index: 1
(Northwestern Polytechnical University),
Weimin Cui2
Estimated H-index: 2
(Northwestern Polytechnical University),
Yu Shi1
Estimated H-index: 1
(Northwestern Polytechnical University)
... more
Abstract This paper analyzes the functional principle and functional hazard analysis for a landing gear cabin door lock mechanism, concluding that the unlocking function of the lock mechanism is the one at most risk. Then the failure probability of the unlocking process of the lock mechanism is calculated, based on the simulation model of the lock mechanism and the response surface method. At last, the failure boundary of the lock mechanism is studied, includin...
3 Citations Source Cite
Ermal Hetemi1
Estimated H-index: 1
(Royal Institute of Technology),
Joaquín Bienvenido Ordieres Meré4
Estimated H-index: 4
(Technical University of Madrid),
Cali Nuur9
Estimated H-index: 9
(Royal Institute of Technology)
... more
Abstract Research in large scale infrastructure projects have argued that the overall project performance is subject to lock-in, yet this is little understood empirically and more research is needed. Recently studies reported that lock-in can occur both at the decision-making level and at the project execution level respectively. The underlying patterns influencing project scope transformation, due to evolving expectations and/or stakeholder’s perspective and the occurrence of l...
1 Citations Source Cite
2018 in Marine Structures [IF: 2.49]
André Farinha (Instituto Superior Técnico), Luís Sousa6
Estimated H-index: 6
(Instituto Superior Técnico),
L. Reis16
Estimated H-index: 16
(Instituto Superior Técnico)
Abstract This paper presents a crashworthiness case study where is evaluated the Douro river lock gates' strength due to ship collisions. The increasing traffic in the Douro waterway and the prospect of reopening the Moncorvo iron mines have settled the conditions for starting the preliminary works on the modernisation of the waterway. Since the construction of the Douro river lock gates, the mass of the ships navigating the waterway have increased from a maximum of 2200 tons–2900 ...
Source Cite
Seth DeVore3
Estimated H-index: 3
(University of Pittsburgh),
Alexandre Gauthier2
Estimated H-index: 2
(University of Pittsburgh),
Jeremy Levy28
Estimated H-index: 28
(University of Pittsburgh)
... more
A lock-in amplifier is a versatile instrument frequently used in physics research. However, many students struggle with the basic operating principles of a lock-in amplifier which can lead to a variety of difficulties. To improve students' understanding, we have been developing and evaluating a research-based tutorial which makes use of a computer simulation of a lock-in amplifier. The tutorial is based on a field-tested approach in which students realize their diffic...
2 Citations Download PDF Cite