1,691 research outputs found

    Criminal violence in modern Britain

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    Although studying the history of violence invites a broad methodological and topical diversity, three issues have predominated: the relationship between quantitative and qualitative methods, the notion of a "civilizing process," and the topic of gender. As "violence" refers to physical acts as well as to cultural understandings of those acts, coming to terms with its history has meant fusing quantitative, social-history emphases on social structure and behavior with qualitative, cultural approaches to understanding narrative and discourse. There is now a consensus that, over the long term, rates of interpersonal violence declined between the late Middle Ages and the middle of the twentieth century; nonetheless, over the same period violence played an ever more prominent role among people's social fears. Building upon these findings, some historians of violence assert that a "civilizing process"– involving new patterns of social interaction and psychological restraint – has affected both the social reality and cultural construction of violence. In these and other approaches, gender has emerged as the most prominent of a variety of central concerns, although its specific role in shaping the cultures and patterns of violence remains unclear and debated

    A Theoretical Treatment of the Steady-Flow, Linear, Crossed-Field, Direct-Current Plasma Accelerator for Inviscid, Adiabatic, Isothermal, Constant-Area Flow

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    The theory is developed from the individual equations of motion of the three components of the plasma. The effect of the ion cyclotron angle (omega tau), which is the product of the ion cyclotron frequency and the ion mean free time between collisions with neutral particles and which is proportional to the axial component of the ion slip velocity, on both Joule heating rate and accelerator length is included in the results and is shown to be small only for values of about 10(exp -3) radian or less

    Pink Lady & Sundowner apples

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    This bulletin summaries for all Australian growers the present technical information concerning Pink Lady and Sundownerhttps://researchlibrary.agric.wa.gov.au/bulletins/1273/thumbnail.jp

    On the Lubricity and Comparative Life Cycle of Biobased Synthetic and Mineral Oil Emulsions in Machining Titanium Ti-6Al-4V at Low Cutting Speed

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    The paper discusses an instrumented tapping test method using a CNC machine tool to compare the lubricity of MWFs by cutting threads in a Ti-6Al-4V alloy at low speed. The method uses a spiral flute tap size typical of industrial practice. A soft synchronous tap holder and spindle mounted dynamometer were incorporated on the machine to measure torque and thrust force. The tapping test method was demonstrated on three groups of MWFs that were commercially available and classified by ASTM E2523-13:2018. The method developed stable results free of chip clogging in tool flutes which could otherwise mask their comparative lubricity. The fully synthetic (FS) group displayed the best lubricity and within this group the FS from renewables (FS-bio) was the best overall. The method was shown to be effective in mitigating biasing effects on lubricity performance due to the generous tool chamfer angle tolerance and was practical and economical to implement. The significance of the results is discussed enabling an understanding of friction effects in tapping using a soft synchronous tap holder. A life cycle assessment of each MWF group found total Greenhouse Gas emitted from the FS group was 17% of the hydrocarbon group whilst FS-bio emitted just 7%

    Hipparcos period-luminosity relations for Miras and semiregular variables

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    We present period-luminosity diagrams for nearby Miras and semiregulars, selecting stars with parallaxes better than 20 per cent and well-determined periods. Using K-band magnitudes, we find two well-defined P-L sequences, one corresponding to the standard Mira P-L relation and the second shifted to shorter periods by a factor of about 1.9. The second sequence only contains semiregular variables, while the Mira sequence contains both Miras and semiregulars. Several semiregular stars show double periods in agreement with both relations. The Whitelock evolutionary track is shown to fit the data, indicating that the semiregulars are Mira progenitors. The transition between the two sequences may correspond to a change in pulsation mode or to a change in the stellar structure. Large amplitude pulsations leading to classical Mira classification occur mainly near the tip of the local AGB luminosity function.Comment: 10 pages with figures, accepted by ApJ Letter
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