We critically review the concepts of sexual addiction, sexual compulsivity, and sexual impulsivity and discuss their theoretical bases. A sample of 31 self-defined sex addicts were assessed by means of interview and questionnaires and compared with a large age-matched control group. A tendency to experience increased sexual interest in states of depression or anxiety was strongly characteristic of the sex addict group. Dissociative experiences were described by 45% of sex addicts and may have some explanatory relevance. Obsessive-compulsive mechanisms may be relevant in some cases, and the addiction concept may prove to be relevant with further research. Overall, results suggested that out of control sexual behavior results from a variety of mechanisms. We propose an alternative theoretical approach to investigating these mechanisms based on the dual control model and recent research on the relation between mood and sexuality.

http://faculty.buffalostate.edu/macleamg/440/bancroft 2004 jsr.pdf

Sexual addiction, sexual compulsivity, sexual impulsivity, or what? Toward a theoretical model

Recent progress on control strategies for inherent issues in friction stir welding

Prospects of laser beam welding and friction stir welding processes for aluminum airframe structural applications

The term “asexual” has been defined in many different ways and asexuality has received very little research attention. In a small qualitative study (N = 4), individuals who self-identified as asexual were interviewed to help formulate hypotheses for a larger study. The second larger study was an online survey drawn from a convenience sample designed to better characterize asexuality and to test predictors of asexual identity. A convenience sample of 1,146 individuals (N = 41 self-identified asexual) completed online questionnaires assessing sexual history, sexual inhibition and excitation, sexual desire, and an open-response questionnaire concerning asexual identity. Asexuals reported significantly less desire for sex with a partner, lower sexual arousability, and lower sexual excitation but did not differ consistently from non-asexuals in their sexual inhibition scores or their desire to masturbate. Content analyses supported the idea that low sexual desire is the primary feature predicting asexual identity.

/pdf/asexuality-classification-and-characterization-hm4q324yco.pdf

Asexuality: Classification and characterization

High power ultrasonic spot welding (USW) is a low heat input solid-state joining process that may offer a solution for welding difficult dissimilar-material couples, like magnesium (Mg) to aluminium (Al) for automotive body applications. However, the high strain rate dynamic deformation in USW has been claimed to accelerate inter-diffusion rates in dissimilar joints. The interfacial reaction between Al, AA6111, and Mg AZ31 alloys has been studied as a function of welding energy. For the optimum welding condition of 600 J (0.4 s) the reaction layer thickness was already ∼5 μm thick. Intermetallic reaction centres were found to nucleate within microwelds at the interface at very short welding times and spread and grow rapidly to form a continuous layer, composed of two sub-layers of Al 12 Mg 17 and Al 3 Mg 2 . Interface liquation was also found for longer welding times at temperatures below the recognised lowest eutectic reaction temperature in the Al–Mg binary system. Modelling has been used to show that the solid state reaction kinetics were over twice the rate expected from parabolic growth predictions made using rate constants obtained under static test conditions. The reasons for this discrepancy and the depressed melting reaction are discussed.

/pdf/the-effect-of-high-strain-rate-deformation-on-intermetallic-22hilustme.pdf

The effect of high strain rate deformation on intermetallic reaction during ultrasonic welding aluminium to magnesium

https://www.research.manchester.ac.uk/portal/files/47810983/Sun_et_al_RS_Distributions_in_AA_FrictionStirWelds_JMPT_accepted.pdf

Comparison of residual stress distributions in conventional and stationary shoulder high-strength aluminum alloy friction stir welds

https://www.research.manchester.ac.uk/portal/files/45513421/Wu_Prangnell_SS_FSW_JMPT_Author_copy.pdf

Stationary shoulder FSW for joining high strength aluminum alloys

The ability to join dissimilar materials in the automotive industry will result in more efficient multimaterial structures. However, welding of aluminium (Al) to magnesium (Mg) alloys is problematic because of the rapid formation of brittle intermetallic phases at the weld interface. Ultrasonic welding (USW) is a solid-state joining technology that may offer a potential solution, but USW of Al to Mg is currently not well understood. Here, we have investigated the effect of process variables and energy input on joint formation between Al-6111 and Mg-AZ31 alloys, and we report on the optimum welding conditions, heat generation, and the formation of a significant intermetallic reaction layer. Furthermore, the factors influencing the interface reaction rate and the advantages of precoating the Mg with Al are discussed.

Optimization of Aluminium-to-Magnesium Ultrasonic Spot Welding

Dissimilar joining of aluminum to steel sheet in multimaterial automotive structures is an important potential application of ultrasonic spot welding (USW). Here, the weldability of different zinc-coated steels with aluminum is discussed, using a 2.5-kW USW welder. Results show that soft hot-dipped zinc (DX56-Z)-coated steel results in better weld performance than hard (galv-annealed) zinc coatings (DX53-ZF). For Al to hard galv-annealed-coated steel welds, lap shear strengths reached a maximum of ~80% of the strength of an Al-Al joint after a 1.0 s welding time. In comparison, welds between Al6111-T4 and hot dipped soft zinc-coated steel took longer to achieve the same maximum strength, but nearly matched the Al-Al joint properties. The reasons for these different behaviors are discussed in terms of the interfacial reactions between the weld members.

Effect of zinc coatings on joint properties and interfacial reactions in aluminum to steel ultrasonic spot welding

Quantitative studies have shown that both straight and gay men with a low propensity for inhibition of sexual arousal are more likely to engage in unprotected sex in the face of risk. This article reports findings from an interview study of both straight and gay men focusing on the individual's experience of the impact of sexual arousal on risk management. The impact of the immediate post-ejaculatory period and the effects of condoms on sexual arousal are also considered. Three patterns were apparent in both groups: (a) low inhibition of sexual arousal associated with impaired risk management; (b) low inhibition of arousal in risk situations leading to establishment of planning ahead, and (c) no impact of sexual arousal on risk management. We also consider the contrast between committed and uncommitted relationships. Lastly, we consider possible mediating mechanisms between sexual arousal and risk management and discuss the implications of these varied patterns for interventions to reduce high-risk sexual behavior.

David Strong

Papers

Comparison of residual stress distributions in conventional and stationary shoulder high-strength aluminum alloy friction stir welds

Stationary shoulder FSW for joining high strength aluminum alloys

Optimization of Aluminium-to-Magnesium Ultrasonic Spot Welding

Effect of zinc coatings on joint properties and interfacial reactions in aluminum to steel ultrasonic spot welding

The impact of sexual arousal on sexual risk‐taking: A qualitative study