Imagining and producing the 'good' migrant: the role of recruitment agencies in shaping bodily goodness

This paper focuses on representations of labour migrants and interrogates how such imaginaries shape migrant recruitment and employment regimes. The recruitment and employment of labour migrants inevitably involves a range of knowledge practices which affect who is recruited, from where and for what purposes. In particular this paper seeks to advance understandings of how images of ‘bodily goodness’ are represented graphically and how perceptions of migrant workers influence the recruitment of workers from Latvia. The analysis results in a schema of the ‘filtering’ processes that are enacted to ‘produce’ the ‘ideal’ migrant worker

Yang-Mills action from minimally coupled bosons on R^4 and on the 4D Moyal plane

We consider bosons on Euclidean R^4 that are minimally coupled to an external Yang-Mills field. We compute the logarithmically divergent part of the cut-off regularized quantum effective action of this system. We confirm the known result that this term is proportional to the Yang-Mills action. We use pseudodifferential operator methods throughout to prepare the ground for a generalization of our calculation to the noncommutative four-dimensional Moyal plane (also known as noncommutative flat space). We also include a detailed comparison of our cut-off regularization to heat kernel techniques. In the case of the noncommutative space, we complement the usual technique of asymptotic expansion in the momentum variable with operator theoretic arguments in order to keep separated quantum from noncommutativity effects. We show that the result from the commutative space R^4 still holds if one replaces all pointwise products by the noncommutative Moyal product.Comment: 37 pages, v2 contains an improved treatment of the theta function in Appendix A.

Effect of stress concentration on fatigue strength of type 20 steel

Досліджено вплив концентрації напруження на втомну міцність сталі 20. Втомні випробування здійснювалися на тонкостінних трубчатих зразках з концентратором і без концентратора. Втомна міцність зразків з концентратором напружень була меншою за втомну міцність зразків без концентратора напружень. Вплив концентрації напружень на циклічну довговічність зразків був найбільшим за бази випробувань 106 циклів. Із збільшенням амплітуди напружень вплив концентратора на довговічність зменшувалась і сходила нанівець у діапазоні квазістатичного руйнування. В роботі розглянуто застосування силового підходу, правила Нейбера та правила Глінки до оцінки довговічності сталевих елементів конструкцій у діапазоні малоциклового навантажування за наявності концентраторів напруження. Результати розрахунку за силовим підходом та правилом Нейбера добре узгоджуються з дослідними даними.The effect of stress concentration on fatigue strength of type 20 steel was investigated. The fatigue tests were carried out on thin-walled tubular smooth specimens and specimens containing a circular hole. The fatigue strength of specimens with stress concentrators was lower than that of smooth specimens. The effect of stress concentration on fatigue life of specimens was the largest on test base of 106 cycles. With the increase in the amplitude of stress this effect decreased and reduced to naught in the range of quasi-static fracture. The S-N approach as well as Neuber’s rule and Glinka’s rule were used in this study for fatigue life prediction for notched specimens in the range of low cycle fatigue. The Neuber’s rule and S-N approach was found to correlate data well.Исследовано влияние концентрации напряжений на усталостную прочность стали 20. Усталостные испытания проводились на тонкостенных трубчатых образцах с концентратором и без концентратора. Усталостная прочность образцов с концентратором напряжений была меньше чем усталостная прочность образцов без концентратора напряжений. Влияние концентрации напряжений на циклическую долговечность образцов было наибольшим на базе испытаний 106 циклов. С увеличением амплитуды напряжений влияние концентратора на долговечность уменьшалось и сходило на нет в диапазоне квазистатического разрушения. В работе рассмотрено использование силового подхода, правила Нейбера, правила Глтнки к оценке долговечности стальных элементов конструкций в диапазоне малоциклового нагружения при наличии концентраторов напряжения. Результаты расчета по силовому подходу и правилу Нейбера хорошо согласуются с опытными данными

Quantum Graphs II: Some spectral properties of quantum and combinatorial graphs

The paper deals with some spectral properties of (mostly infinite) quantum and combinatorial graphs. Quantum graphs have been intensively studied lately due to their numerous applications to mesoscopic physics, nanotechnology, optics, and other areas. A Schnol type theorem is proven that allows one to detect that a point belongs to the spectrum when a generalized eigenfunction with an subexponential growth integral estimate is available. A theorem on spectral gap opening for ``decorated'' quantum graphs is established (its analog is known for the combinatorial case). It is also shown that if a periodic combinatorial or quantum graph has a point spectrum, it is generated by compactly supported eigenfunctions (``scars'').Comment: 4 eps figures, LATEX file, 21 pages Revised form: a cut-and-paste blooper fixe

Experimental studies and nuclear model calculations on (p,xn) and (p,pxn) reactions on 85Rb from their threshold up to 100 MeV

Excitation functions were measured by the stacked-foil technique for the reactions Rb-85(p, pxn)Rb-89m,Rb-g83,Rb-82m.81 from their thresholds up to 100MeV. Nuclear model calculations were performed using the code ALICE-IPPE both on (p, xn) reactions reported earlier and (p, pxn) reactions described here. The experimental excitation curves and the results of nuclear model calculations were found to be qualitatively in agreement. With the exception of the (p, n) reaction above 40MeV, the theory appears to reproduce all the experimental data within deviations of about 50%. The cross section ratios for the isomeric pairs Sr-85m,Sr-g and Rb-84m,Rb-g are discussed qualitatively in terms of the spins of the states involved and the increasing projectile energy

Study on Modification of Lignin as Dispersant of Aqueous Graphene Suspension and Corrosion Performance in Waterborne G/Epoxy Coating

Though graphene (G) as an excellent protective material for metal, it can aggravate metal corrosion in other side. The modification of sodium lignin sulfonate was achieved by using itaconic acid and acrylamide，which was proved by UV-vis and Raman spectra. The modified sodium lignin sulfonate (LAI) with more carboxylic groups can be used as the dispersant for aqueous graphene suspension. The commercial graphene can be dispersed uniformly and stability in water via π-π interaction with LAI at high concentration (6 mg/mL)，and the LAI-G system can be used as an inhibitor in waterborne epoxy coatings too. Electrochemical impedance spectroscope (EIS) and Tafel polarization curves showed that the corrosion performance of waterborne epoxy system with well-dispersed G (0.5 wt %) was remarkably improved compared with pure epoxy coating

Wigner transform and pseudodifferential operators on symmetric spaces of non-compact type

We obtain a general expression for a Wigner transform (Wigner function) on symmetric spaces of non-compact type and study the Weyl calculus of pseudodifferential operators on them

Detailed balance in Horava-Lifshitz gravity

We study Horava-Lifshitz gravity in the presence of a scalar field. When the detailed balance condition is implemented, a new term in the gravitational sector is added in order to maintain ultraviolet stability. The four-dimensional theory is of a scalar-tensor type with a positive cosmological constant and gravity is nonminimally coupled with the scalar and its gradient terms. The scalar field has a double-well potential and, if required to play the role of the inflation, can produce a scale-invariant spectrum. The total action is rather complicated and there is no analog of the Einstein frame where Lorentz invariance is recovered in the infrared. For these reasons it may be necessary to abandon detailed balance. We comment on open problems and future directions in anisotropic critical models of gravity.Comment: 10 pages. v2: discussion expanded and improved, section on generalizations added, typos corrected, references added, conclusions unchange