Reclaiming the political : emancipation and critique in security studies

The critical security studies literature has been marked by a shared commitment towards the politicization of security – that is, the analysis of its assumptions, implications and the practices through which it is (re)produced. In recent years, however, politicization has been accompanied by a tendency to conceive security as connected with a logic of exclusion, totalization and even violence. This has resulted in an imbalanced politicization that weakens critique. Seeking to tackle this situation, the present article engages with contributions that have advanced emancipatory versions of security. Starting with, but going beyond, the so-called Aberystwyth School of security studies, the argument reconsiders the meaning of security as emancipation by making the case for a systematic engagement with the notions of reality and power. This revised version of security as emancipation strengthens critique by addressing political dimensions that have been underplayed in the critical security literature

Analysis of Yield Criteria and Flow Curves on FLC for TWIP900 Steel

In this study, the applicability of yield criteria and flow curve models to predict forming limit curve (FLC) via the Marciniak-Kuczynski (M-K) model is investigated for TWIP900 steel. Forming limit characteristics of TWIP900 are determined experimentally and numerically. The yield criteria of Hill48, Barlat89, YLD2000-2d, and BBC2000 are tested and compared with each other. Results indicate that the YLD2000-2d and the BBC2000 yield criteria are found to be more accurate than the other criteria. The YLD2000 criterion has the best prediction capability with the Krupskowsky flow curve while the BBC2000 model has the best prediction with the Ludwick flow curve model. © 2020, The Society for Experimental Mechanics, Inc

STUDIES ON THE BIOLOGY OF EULECANIUM CILIATUM (DOUGLAS) (HEMIPTERA: COCCIDAE) IN ANKARA, TURKEY

STUDIES ON THE BIOLOGY OF EULECANIUM CILIATUM (DOUGLAS) (HEMIPTERA: COCCIDAE) IN ANKARA, TURKEY. Eulecanium ciliatum Douglas is a common pest species on Aceraceae and Rosaceae in Ankara province, Turkey. Its biology was investigated on Acer campestre, A. pseudoplatanus, Crataegus monogyna and C. oxyacantha in 1995-1996. E. ciliatum had one generation a year and overwintered as the 2nd-instar nymph. The number of eggs laid per female depended on the host, with the greatest number of eggs being laid on A. pseudoplatanus, on which it had the densest populations. The 1st-instar nymphs were found on both leaf surfaces but they preferred the upper surface. The 2nd-instar nymphs preferred sites on branches on the north-east side of the host trees. The sex ratio varied between 1.5 and 3.8¢:1TM. Key words: Palaearctic, life cycle, ecology, host plants, settling sites, migration, Formica cunicularia, Camponatus aethiops, Plagiolepis vindobonensis, Anthribus fasciatus, urban entomology, Brunton compass, predator

NATURAL ENEMIES OF THE OAK SCALE INSECT, EULECANIUM CILIATUM (DOUGLAS) (HEMIPTERA: COCCIDAE) IN TURKEY

NATURAL ENEMIES OF THE OAK SCALE INSECT, EULECANIUM CILIATUM (DOUGLAS) (HEMIPTERA: COCCIDAE) IN TURKEY. Eulecanium ciliatum Douglas is an important pest of ornamental plants in the Palaearctic region and has a wide range of natural enemies. In Ankara, Turkey, eight hymenopterous parasitoids and one hyperparasitoid species have been bred from this scale, and nine predators were collected in association with it, seven Coleoptera and two Hemiptera. Key words: urban, ornamental plantings, parasitoid hosts, predator hosts, Aphelinidae, Encyrtidae, Eulophidae, Pteromalidae, Anthribidae, Coccinellidae, Cybocephalidae, Miridae

FAUNISTIC STUDIES ON THE COCCIDAE ON ORNAMENTAL PLANTS IN ANKARA, TURKEY

FAUNISTIC STUDIES ON THE COCCIDAE ON ORNAMENTAL PLANTS IN ANKARA, TURKEY. The coccid species present in parks, gardens and greenhouses in Ankara, Turkey, and their host plants were studied in 1992, ‘94, ‘95 and ‘96. Thirteen species of Coccidae were detected on ornamental plants: two species of Eulecanium, four species of Parthenolecanium and one species each from the genera Coccus, Filippia, Palaeolecanium, Physokermes, Pulvinaria, Saissetia and Sphaerolecanium. The most common species was Parthenolecanium corni, found on 36% of the infested ornamental plants. Physokermes picea was found on four species of Picea, of which it infested 16.3% of the plants surveyed. Filippia follicularis was detected on 2% of Fraxinus spp. while Physokermes piceae, Filippia follicularis, Parthenolecanium persicae and P. pomeranicum were recovered on 16, 2, 1 and 1% of the infested plants respectively. Key words: Coccoidea, Coccidae, urban, ornamental plantings, hosts, geographic distribution

Determination of anisotropy parameters via the optimization process of V-bending

American Society of Mechanical Engineers (ASME)ASME 2015 International Mechanical Engineering Congress and Exposition, IMECE 2015 -- 13 November 2015 through 19 November 2015 -- Houston -- 121052In recent years, the use of optimization methods in sheet metal forming has been increased remarkably. In the finite element simulation of the sheet metal stamping operations, the model parameters are determined from the several tests like tensile, compression, and biaxial stretching tests (bulge test). In this study, Yld2000-2d anisotropic yield function parameters are determined for DP800 advanced high strength steel using a 60o V-shaped die bending process. The difference between the simulation and experiment is found to be 1 degree using the classical determination method of the anisotropy parameters. The difference is 0.1 degree using the optimization method. Copyright © 2015 by ASME

Analysis of Yield Criteria and Flow Curves on FLC for TWIP900 Steel

In this study, the applicability of yield criteria and flow curve models to predict forming limit curve (FLC) via the Marciniak-Kuczynski (M-K) model is investigated for TWIP900 steel. Forming limit characteristics of TWIP900 are determined experimentally and numerically. The yield criteria of Hill48, Barlat89, YLD2000-2d, and BBC2000 are tested and compared with each other. Results indicate that the YLD2000-2d and the BBC2000 yield criteria are found to be more accurate than the other criteria. The YLD2000 criterion has the best prediction capability with the Krupskowsky flow curve while the BBC2000 model has the best prediction with the Ludwick flow curve model

Evaluation of tensile properties of 5754-O type aluminum- magnesium alloy at cold and warm temperature

Central MOTEK Corporation; Daewoo Shipbuiling and Marine Engineering Co., LTD. (DSME); Doosan Heavy Industries and Construction Co., LTD.; et al.; Hyundai Motor Company; POSCO9th International Conference on Technology of Plasticity, ICTP 2008 -- 7 September 2008 through 11 September 2008 -- Gyeongju -- 104766In this research, uniaxial tensile deformation behavior of 5754-O type aluminum-magnesium (Al- Mg) alloy sheets which are used widely in diverse applications ranging from automotive bodies to food processing due to their excellent high strength to weight ratio, corrosion resistance, and weldability were investigated at temperature range between -60 to 250oC and at the range of strain rates 0.0016-0.04 s-1. Mechanical properties such as yield strength (YS), ultimate tensile strength (UTS), strain hardening coefficient (n), strain rate sensitivity (m), total elongation (TE) and reduction of area (RA) were determined. In addition, the elimination of Luder's band (stretcher marks or line) elimination was investigated. The ductility of the alloy was calculated by two different methods. As a result, the ductility was found to increase with increasing temperature and to decrease with increasing strain rate. Luder's band elimination was observed with increasing temperatures and strain rates. The test results at cold temperatures indicated that an increase in total elongation and strain hardening coefficient were observed. Optimum formability condition was obtained at high temperature and low strain rate

Creating atom-nanoparticle quantum superpositions

A nanoscale object evidenced in a nonclassical state of its center of mass will hugely extend the boundaries of quantum mechanics. To obtain a practical scheme for the same, we exploit a hitherto unexplored coupled system: an atom and a nanoparticle coupled by an optical field. We show how to control the center of mass of a large ∼ 500 -nm nanoparticle using the internal state of the atom so as to create, as well as detect, nonclassical motional states of the nanoparticle. Specifically, we consider a setup based on a silica nanoparticle coupled to a cesium atom and discuss a protocol for preparing and verifying a Schrödinger-cat state of the nanoparticle that does not require cooling to the motional ground state. We show that the existence of the superposition can be revealed using the Earth's gravitational field using a method that is insensitive to the most common sources of decoherence and works for any initial state of the nanoparticle

Numerical modeling of the thermal contact in metal forming processes

Heat flow across the interface of solid bodies in contact is an important aspect in several engineering applications. This work presents a finite element model for the analysis of thermal contact, which takes into account the effect of contact pressure and gap dimension in the heat flow across the interface between two bodies. Additionally, the frictional heat generation is also addressed, which is dictated by the contact forces predicted by the mechanical problem. The frictional contact problem and thermal problem are formulated in the frame of the finite element method. A new law is proposed to define the interfacial heat transfer coefficient (IHTC) as a function of the contact pressure and gap distance, enabling a smooth transition between two contact status (gap and contact). The staggered scheme used as coupling strategy to solve the thermomechanical problem is briefly presented. Four numerical examples are presented to validate the finite element model and highlight the importance of the proposed law on the predicted temperature.The authors gratefully acknowledge the financial support of the Portuguese Foundation for Science and Technology (FCT) under the project PTDC/EMS-TEC/1805/2012 and by FEDER funds through the program COMPETE Programa Operacional Factores de Competitividade, under the project CENTRO-07-0224- FEDER-002001 (MT4MOBI). The second author is also grateful to the FCT for the postdoctoral grant SFRH/BPD/101334/2014. The authors would like to thank Prof. A. Andrade-Campos for helpful contributions on the development of the finite element code presented in this work.info:eu-repo/semantics/publishedVersio