937 research outputs found
Supersymmetric Model with Grassmann-odd Lagrangian
A supersymmetric model with a Grassmann-odd Lagrangian is
proposed which, in contrast to the model with an even Lagrangian, contains not
only a kinetic term but also an interaction term for the coordinates entering
into one real scalar Grassmann-even (bosonic) superfield.Comment: 6 pages, LATEX 2e. The talk given at the International Conference
"Supersymmetries and Quantum Field Theory" (SSQFT'2000, NSC KIPT, Kharkov,
Ukraine, 25-29 July, 2000). To be published in the Proceedings of this
Conference. Corrections of misprint
The Occurrence of Alfalfa Weevil and Its Major Parasitoid \u3cem\u3eBathyplectes curculionis\u3c/em\u3e across Saskatchewan, Canada
The alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae) is one of the most destructive insect pests of alfalfa herbage in North America. Palearctic in origin, the weevil was first found in North America near Salt Lake City, Utah, in 1902 (Titus 1911), with the first Canadian record in southeast Alberta and southwest Saskatchewan in 1954 (Hobbs et al. 1959; Beirne 1971). Alfalfa weevil became an economic pest on the Canadian prairies only in the area of first location, and its distribution remained below the 51st parallel North latitude for about 40 years. In the mid-1990s, however, the weevil expanded its distribution eastward across southern Saskatchewan and into the neighbouring province of Manitoba (Soroka and Goerzen 2002), where heavy infestations in the last decade caused serious losses to alfalfa hay quantity and quality (Gavloski 2008). Many parasitoids of alfalfa weevil were introduced into North America from Europe in the last century, and the species that established in the eastern half of the continent (Soroka and Otani 2011) have been effective in reducing the impact of the weevil there. The larval parasitoid Bathyplectes curculionis (Thomson) (Hymenoptera: Ichneu-monidae) is the only parasitoid that is well established in western North America, and its distribution on the Canadian prairies is uncertain.
This study was undertaken to determine the distribution of alfalfa weevil in Saskatchewan, Canada, in order to evaluate the potential impact of the pest on the 1.5 million ha of alfalfa and alfalfa/grass hay production in the province. Further, we wished to determine the occurrence of B. curculionis and the possible effect of the parasitoid on the weevil
Degenerate Odd Poisson Bracket on Grassmann Variables
A linear degenerate odd Poisson bracket (antibracket) realized solely on
Grassmann variables is presented. It is revealed that this bracket has at once
three nilpotent -like differential operators of the first, the second
and the third orders with respect to the Grassmann derivatives. It is shown
that these -like operators together with the Grassmann-odd nilpotent
Casimir function of this bracket form a finite-dimensional Lie superalgebra.Comment: 5 pages, LATEX. Corrections of misprints. The relation (23) is adde
Hairy canola deters flea beetle feeding
Non-Peer ReviewedFlea beetle, chiefly Phyllotreta crucifrerae, behaviour and feeding on lines of Brassica napus canola with elevated levels of trichomes on true leaves were compared with feeding on leaves of parent seedlings. The beetles became agitated and seldom settled down to feed when exposed to the hairy seedlings. Levels of feeding on the new lines were measured in a laboratory trial at Saskatoon, and in field trials at Saskatoon (2005, 2006) and Lethbridge (2006). Initially, feeding levels were lower on cotyledons of the recombinants than on those of the parental line, possibly because of the increased angle of recombinant cotyledons relative to the soil surface. As cotyledons became more horizontal on recombinant seedlings, feeding upon them increased, but feeding on true leaves of the transgenic lines was less than on true leaves of parental lines The
decreased feeding on true leaves of recombinant seedlings is a first step in developing canola resistance to the insect
Field Representations of Vector Supersymmetry
We study some field representations of vector supersymmetry with superspin
Y=0 and Y=1/2 and nonvanishing central charges. For Y=0, we present two
multiplets composed of four spinor fields, two even and two odd, and we provide
a free action for them. The main differences between these two multiplets are
the way the central charge operators act and the compatibility with the
Majorana reality condition on the spinors. One of the two is related to a
previously studied spinning particle model. For Y=1/2, we present a multiplet
composed of one even scalar, one odd vector and one even selfdual two-form,
which is a truncation of a known representation of the tensor supersymmetry
algebra in Euclidean spacetime. We discuss its rotation to Minkowski spacetime
and provide a set of dynamical equations for it, which are however not derived
from a Lagrangian. We develop a superspace formalism for vector supersymmetry
with central charges and we derive our multiplets by superspace techniques.
Finally, we discuss some representations with vanishing central charges.Comment: 37 page
Spin Seebeck effect in Y-type hexagonal ferrite thin films
Spin Seebeck effect (SSE) has been investigated in thin films of two
Y-hexagonal ferrites BaZnFeO (Zn2Y) and
BaCoFeO (Co2Y) deposited by a spin-coating method on
SrTiO(111) substrate. The selected hexagonal ferrites are both
ferrimagnetic with similar magnetic moments at room temperature and both
exhibit easy magnetization plane normal to -axis. Despite that, SSE signal
was only observed for Zn2Y, whereas no significant SSE signal was detected for
Co2Y. We tentatively explain this different behavior by a presence of two
different magnetic ions in Co2Y, whose random distribution over octahedral
sites interferes the long range ordering and enhances the Gilbert damping
constant. The temperature dependence of SSE for Zn2Y was measured and analyzed
with regard to the heat flux and temperature gradient relevant to the SSE
signal.Comment: 7 pages, 9 figure
Satisfiability.jl: Satisfiability Modulo Theories in Julia
Satisfiability modulo theories (SMT) is a core tool in formal verification.
While the SMT-LIB specification language can be used to interact with theorem
proving software, a high-level interface allows for faster and easier
specifications of complex SMT formulae. In this paper we discuss the design and
implementation of a novel publicly-available interface for interacting with
SMT-LIB compliant solvers in the Julia programming language.Comment: 14 pages, 5 figures. Submitted to Verification, Model Checking, and
Abstract Interpretation 2024 (conference), in revie
Incontinence-specific quality of life measures used in trials of treatments for female urinary incontinence: a systematic review.
This systematic review examined the use of incontinence-specific QOL measures in clinical trials of female incontinence treatments, and systematically evaluated their quality using a standard checklist.
Of 61 trials included in the review, 58 (95.1%) used an incontinence-specific QOL measure. The most commonly used were IIQ (19 papers), I-QoL (12 papers) and UDI (9 papers). Eleven papers (18.0%) used measures which were not referenced or were developed specifically for the study. The eight QOL measures identified had good clinical face validity and measurement properties.
We advise researchers to evaluate carefully the needs of their specific study, and select the QOL measure that is most appropriate in terms of validity, utility and relevance, and discourage the development of new measures. Until better evidence is available on the validity and comparability of measures, we recommend that researchers consider using IIQ or I-QOL with or without UDI in trials of incontinence treatments
Resource-efficient technology to produce 4-aminodiphenylamine
A critical analysis of the existing and emerging methods for preparation of 4-aminodiphenylamine has been conducted. It is noted that, in economic and environmental terms, the promising methods are based on condensation of aniline with nitrobenzene in an alkaline medium, followed by hydrogenation of the resulting intermediates. Using the above method for industrial production of 4-ADPA will help eliminate principal shortcomings inherent in the existing industrial methods: reduce unit operations of the process, use more accessible, inexpensive raw materials, increase product yield, eliminate formation of carcinogenic substances, significantly decrease the formation of waste products and, most importantly, decrease the volume of waste water. The most promising methods for industrial production are recent discoveries that use heterogeneous catalysts during condensation of aniline with nitrobenzene, e.g., zeolite ZSM-5 treated with tetramethylammonium hydroxide or highly basic anions which considerably simplify production technology and process control, lower costs and comply with strict environmental requirements
Event-Driven Environmental News in the U.S. and Canada
This paper presents results from a content analytic study of U.S. and Canadian evening news programs on energy and environmental topics from 1999 to 2009. The analysis reveals the importance of coverage of weather and natural disasters in both countries — importance not just in terms of the volume of coverage, but in the role that coverage plays in driving discussion of broader, more thematic coverage of pollution and climate change. Indeed, causality tests reveal that coverage of climate change, pollution and related issues are strongly affected by — or, rather, dependent on — coverage of disasters and other weather events
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