4,203 research outputs found
Power-recycled weak-value-based metrology
We improve the precision of the interferometric weak-value-based beam
deflection measurement by introducing a power recycling mirror, creating a
resonant cavity. This results in \emph{all} the light exiting to the detector
with a large deflection, thus eliminating the inefficiency of the rare
postselection. The signal-to-noise ratio of the deflection is itself magnified
by the weak value. We discuss ways to realize this proposal, using a transverse
beam filter and different cavity designs.Comment: 5 pages, 1 figur
Different hydrogen-bonded chains in the crystal structures of three alkyl N-[(E )-1-(2-benzylidene-1-methylhydrazinyl)-3- hydroxy-1-oxopropan-2-yl]carbamates
Peer reviewedPublisher PD
Comparing Systems Engineering and Project Success in Commercial-focused versus Government-focused Projects
This work looks at the relationship between systems engineering and project success industry lead in aerospace, agriculture, defense & security, energy and related areas. The projects included both commercial-focused and government-focused efforts. Differences were found in both the overall risk levels and the measures of success for the two groups. In addition, government-focused projects showed a notably larger number of significant relationships between system engineering processes and project success than the commercial-focused projects. The research notes that further investigation is warranted, in particular looking at individual industry sectors, exploring the impact of team dispersion, and developing a better understanding of interrelationships between the systems engineering processes. This type of analysis will help further our understanding of both the art and science of systems engineering
Rural Teaching Principal: Leadership with Precious Few Minutes
Presented is a case study of school leadership examining a rural teaching principal in a small K-12 school in a prairie province. The case examines the intensification of workload of a principal of a small K-12 school affected by reductions in student enrolment, staffing and administrative time. Overwhelmed by myriad responsibilities, the principal feels inadequate as both a teacher and a leader. She is exhausted in her efforts to provide quality learning and extracurricular opportunities for students as her workload continues to grow. Teaching activities examine the uniqueness of the teaching principal role and the ways in which leaders manage workload intensification in order to accomplish the responsibilities of this dual role
Lorentz-breaking effects in scalar-tensor theories of gravity
In this work, we study the effects of breaking Lorentz symmetry in
scalar-tensor theories of gravity taking torsion into account. We show that a
space-time with torsion interacting with a Maxwell field by means of a
Chern-Simons-like term is able to explain the optical activity in syncrotron
radiation emitted by cosmological distant radio sources. Without specifying the
source of the dilaton-gravity, we study the dilaton-solution. We analyse the
physical implications of this result in the Jordan-Fierz frame. We also analyse
the effects of the Lorentz breaking in the cosmic string formation process. We
obtain the solution corresponding to a cosmic string in the presence of torsion
by keeping track of the effects of the Chern-Simons coupling and calculate the
charge induced on this cosmic string in this framework. We also show that the
resulting charged cosmic string gives us important effects concerning the
background radiation.The optical activity in this case is also worked out and
discussed.Comment: 10 pages, no figures, ReVTex forma
Identification of antisense nucleic acid hybridization sites in mRNA molecules with self-quenching fluorescent reporter molecules
We describe a physical mRNA mapping strategy employing fluorescent self-quenching reporter molecules (SQRMs) that facilitates the identification of mRNA sequence accessible for hybridization with antisense nucleic acids in vitro and in vivo, real time. SQRMs are 20–30 base oligodeoxynucleotides with 5–6 bp complementary ends to which a 5′ fluorophore and 3′ quenching group are attached. Alone, the SQRM complementary ends form a stem that holds the fluorophore and quencher in contact. When the SQRM forms base pairs with its target, the structure separates the fluorophore from the quencher. This event can be reported by fluorescence emission when the fluorophore is excited. The stem–loop of the SQRM suggests that SQRM be made to target natural stem–loop structures formed during mRNA synthesis. The general utility of this method is demonstrated by SQRM identification of targetable sequence within c-myb and bcl-6 mRNA. Corresponding antisense oligonucleotides reduce these gene products in cells
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