Floating zone process for drawing small diameter fibers of refractory materials

New process produces controlled purity, very high strength, single crystal fibers of materials with melting points to 4000 C. Process has been used to make single crystal fibers of highly refractory ceramics such as aluminum oxide, titanium carbide and yttrium oxide

Float zone processing in a weightless environment

Results are given for investigations into: (1) the physical limits which set the maximum practical diameters of Si crystals that can be processed by the float-zone method in a near weightless environment, and (2) the economic impact of large, space-produced Si crystals on the electronics industry. The stability of the melt is evaluated. Heat transfer and fluid flow within the melt as dependent on the crystal size and the degree and type of rotation imparted to the melt are studied. Methods of utilizing the weightless environment for the production of large, stress-free Si crystals of uniform composition are proposed. The economic effect of large size Si crystals, their potential applications, likely utilization and cost advantages in LSI, integrated circuits, and power devices are also evaluated. Foreseeable advantages of larger diameter wafers of good characteristics and the possibilities seen for greater perfection resulting from stress-free growth are discussed

Kinetic signatures of the region surrounding the X-line in asymmetric (magnetopause) reconnection

Kinetic particle-in-cell simulations are used to identify signatures of the electron diffusion region (EDR) and its surroundings during asymmetric magnetic reconnection. A "shoulder" in the sunward pointing normal electric field (EN > 0) at the reconnection magnetic field reversal is a good indicator of the EDR, and is caused by magnetosheath electron meandering orbits in the vicinity of the x-line. Earthward of the X-line, electrons accelerated by EN form strong currents and crescent-shaped distribution functions in the plane perpendicular to B. Just downstream of the X-line, parallel electric fields create field-aligned crescent electron distribution functions. In the immediate upstream magnetosheath, magnetic field strength, plasma density, and perpendicular electron temperatures are lower than the asymptotic state. In the magnetosphere inflow region, magnetosheath ions intrude resulting in an Earthward pointing electric field and parallel heating of magnetospheric particles. Many of the above properties persist with a guide field of at least unity.Comment: Submitted to Geophysical Research Letter

Description de l’implantation d’un programme de prévention des problèmes de comportement à l’adolescence

This paper describes a comprehensive approach to preventing a variety of adolescent problem behaviors, including drug use, delinquency, violence, school dropout and teenage pregnancy. The experimental intervention is designed to enhance protection and reduce risk for these adolescent problem behaviors. The project, Raising Healthy Children (RHC), extends earlier work conducted in the Seattle Social Development Project (Hawkins, Catalano, Morrison, O'Donnell, Abbott & Day, 1992; O'Donnell, Hawkins, Catalano, Abbott & Day, 1995). The interventions are guided by the Social Development Model (Catalano & Hawkins, 1996), a theory that explains the development of both prosocial and antisocial behavior. Because risk and protective factors for these problems are found in multiple social domains, the interventions address these factors through developmentally appropriate strategies in the three major socializing institutions, the family, school, and peer groups. The "school intervention strategy " provides a series of instructional improvement workshops and classroom coaching designed to increase student's commitment and attachment to school while reducing academic failure. The "family intervention strategy " provides parenting workshops and home-based services to increase parents' skills in child rearing, to increase attachment and commitment to the family while decreasing family management problems. The "peer intervention strategy" provides children the opportunity to learn and practice social and emotional skills in the classroom and in social situations. These combined strategies are described in detail. Preliminary analyses reveal significant effects of these strategies on reducing early risk and increasing protection

Forensic investigation of social networking applications

Social networking applications such as Facebook, Twitter and Linkedin may be involved in instances of misuse such as copyright infringement, data protection violations, defamation, identity theft, harassment, and dissemination of confidential information and malware that can affect both organizations and individuals. In this paper we examine the computer forensic process of obtaining digital evidence from social networking applications and the legal aspects of such. Currently there do not appear to be commonly available guidelines for organizations aimed specifically at the computer forensic process of investigation of social networking applications

Ion Larmor Radius Effects Near A Reconnection X Line At The Magnetopause: Themis Observations And Simulation Comparison

We report a Time History of Events and Macroscale Interactions during Substorms (THEMIS-D) spacecraft crossing of a magnetopause reconnection exhaust ~9 ion skin depths (di) downstream of an X line. The crossing was characterized by ion jetting at speeds substantially below the predicted reconnection outflow speed. In the magnetospheric inflow region THEMIS detected (a) penetration of magnetosheath ions and the resulting flows perpendicular to the reconnection plane, (b) ion outflow extending into the magnetosphere, and (c) enhanced electron parallel temperature. Comparison with a simulation suggests that these signatures are associated with the gyration of magnetosheath ions onto magnetospheric field lines due to the shift of the flow stagnation point toward the low-density magnetosphere. Our observations indicate that these effects, ~2–3 di in width, extend at least 9 di downstream of the X line. The detection of these signatures could indicate large-scale proximity of the X line but do not imply that the spacecraft was upstream of the electron diffusion region

Teaching Parenting Skills in a Methadone Treatment Setting

Family factors significantly affect children’s risk of substance abuse, delinquency, and other problem behaviors (Arthur, Hawkins, Pollard, Catalano, & Baglioni, 2002). Children of substance abusers represent a particularly high-risk population. Prenatal exposure to addictive substances and the medical complications that may arise are important factors that, from conception, place this population at high risk of drug abuse and other problem behaviors (Griffith, Azuma, & Chasnoff, 1994). As children of substance abusers mature, their lives are characterized by exposure to continued drug and alcohol abuse by family members, recurrent or chronic illnesses, frequent moves, financial troubles, legal conflicts, family disorganization, and family conflict (Keller, Catalano, Haggerty, & Fleming, 2002; Kolar, Brown, Haertzen, & Michaelson, 1994). Furthermore, substance-abusing parents tend to have poorer family management practices than nonabusers (Kolar et al.). Substance-abusing parents in treatment are dealing not only with their addiction, the possibility of relapse, and struggles with employment and living arrangements, but also with their role as parents and the influence of their addiction on their children (Greif, 2005)