Fabrication of FeSi and Fe3Si compounds by electron beam induced mixing of [Fe/Si]2 and [Fe3/Si]2 multilayers grown by focused electron beam induced deposition

Fe-Si binary compounds have been fabricated by focused electron beam induced deposition by the alternating use of iron pentacarbonyl, Fe(CO)5, and neopentasilane, Si5H12 as precursor gases. The fabrication procedure consisted in preparing multilayer structures which were treated by low-energy electron irradiation and annealing to induce atomic species intermixing. In this way we are able to fabricate FeSi and Fe3Si binary compounds from [Fe=Si]2 and [Fe3=Si]2 multilayers, as shown by transmission electron microscopy investigations. This fabrication procedure is useful to obtain nanostructured binary alloys from precursors which compete for adsorption sites during growth and, therefore, cannot be used simultaneously

Effects of Cooperative Learning Structures in Physical Education: A Systematic Review

One possibility of successfully dealing with the increasing heterogeneity of students is cooperative learning. However, this learning structure is still rarely used in physical education. To substantiate positive effects of cooperative learning in physical education and to support the commitment of pedagogical staff, the aim of this research was to evaluate physical, social, behavioral and psychological effects of interventions implementing cooperative learning structures in physical education lessons. The current systematic review was designed based on the PRISMA guidelines. Five databases were used to select articles that evaluated effects of cooperative learning in physical education of children and adolescents with an average age within the range of five to 19 years in August 2022. Studies had to report quantitative measured outcomes of cooperative learning. Two authors independently screened studies for eligibility and assessed risk of bias. Descriptive analyses were conducted to evaluate intervention effects. In total, 23 articles reporting 36 outcomes were included in the analysis with an overall sample size of 3699 children and adolescents aged between 6.5 and 17.5 years. Summarized 71% of all reported outcomes resulted in significant positive effects on cooperative learning compared to traditional teaching styles with most positive effects on social outcomes (92%). It is recommended to integrate different teaching styles, e.g. cooperative learning, to improve children’s development and to engage them in lifelong physical activity. Furthermore, interdisciplinary cooperation (e.g. between researchers and pedagogical school staff) should be sought in order to develop pedagogical approaches that consider the needs and prerequisites of students

Policy-based access control from numerical evidence

Increasingly, access to resources needs to be regulated or informed by considerations such as risk, cost, and reputation. We therefore propose a framework for policy languages, based on semi-rings, that aggregate quantitative evidence to support decision-making in access control systems. As aggregation operators \addition", \worst case", and \best case" over non- negative reals are both relevant in practice and amenable to analysis, we study an instance, Peal, of our framework in that setting. Peal is a stand-alone policy language but can also be integrated with existing policy languages. Peal policies can be synthesized into logical formulae that no longer make reference to quantities but capture all policy behavior. Satis ability checking of such formulae can be used to validate and analyze policies in this new evidence-based approach. We discuss a number of applications, including vacuity, redundancy, change-impact and safety analysis. The synthesis algorithm requires a form of subset enumeration, for which we develop bespoke algorithms and demonstrate experimentally that our algorithms work better than generic state exploration methods. We also sketch how our approach extends from non-negative reals to other semi-rings and even to rings such as the real numbers

Shuttle Ku-band and S-band communications implementations study

The interfaces between the Ku-band system and the TDRSS, between the S-band system and the TDRSS, GSTDN and SGLS networks, and between the S-band payload communication equipment and the other Orbiter avionic equipment were investigated. The principal activities reported are: (1) performance analysis of the payload narrowband bent-pipe through the Ku-band communication system; (2) performance evaluation of the TDRSS user constraints placed on the S-band and Ku-band communication systems; (3) assessment of the shuttle-unique S-band TDRSS ground station false lock susceptibility; (4) development of procedure to make S-band antenna measurements during orbital flight; (5) development of procedure to make RFI measurements during orbital flight to assess the performance degradation to the TDRSS S-band communication link; and (6) analysis of the payload interface integration problem areas

Prenatal Care and Infant Mortality in Nevada

Prenatal care, also known as antepartum care, refers to the health services that a pregnant woman receives before a baby’s birth. Health care providers know from numerous studies that prenatal care is important because potential problems that may endanger the mother or her baby may be discovered and treated prior to birth. In many cases, potential problems can be prevented altogether. Because of this, it is important that the pregnant woman not only begins prenatal care early, but also receives continuous care throughout her pregnancy. The preconception (before pregnancy) care is also an important factor affecting the future mother’s and baby’s health. The United States (U.S.) Department of Health and Human Services, Maternal and Child Health Bureau, in their report, A Healthy Start, Begin Before Baby’s Born, at http://www.mchb.hrsa.gov/programs/womeninfants/prenatal.htm, states that Babies born to mothers who received no prenatal care are 3 times more likely to be born at low birth weight and 5 times more likely to die than those whose mothers received prenatal care

Factorization for generic jet production

Factorization is the central ingredient in any theoretical prediction for collider experiments. We introduce a factorization formalism that can be applied to any desired observable, like event shapes or jet observables, for any number of jets and a wide range of jet algorithms in leptonic or hadronic collisions. This is achieved by using soft-collinear effective theory to prove the formal factorization of a generic fully-differential cross section in terms of a hard coefficient, and generic jet and soft functions. In this formalism, whether a given observable factorizes in the usual sense, depends on whether it is inclusive enough, so the jet functions can be calculated perturbatively. The factorization formula for any such observable immediately follows from our general result, including the precise definition of the jet and soft functions appropriate for the observable in question. As examples of our formalism, we work out several results in two-jet production for both e+e- and pp collisions. For the latter, we also comment on how our formalism allows one to treat underlying events and beam remnants.Comment: 33 pages, v2: minor typos corrected, journal versio