Highlights in Coupled Electrochemical Flow Cell-Mass Spectrometry,EC/MS

Probing electrochemical processes by mass spectrometry (EC/MS) is a developing field that benefits from the unmatched identification power of mass spectrometry and from the rapid transfer of electrochemical cell products to the mass spectrometer. Most of the current EC/MS efforts are directed towards the development of differential electrochemical mass spectrometry (DEMS) using the electro-ionization source for identification of volatile compounds, and towards the application of electrospray mass spectrometers for determination of semivolatile and nonvolatile products. The challenges in coupling mass spectrometry and electrochemistry are described, and different approaches to using the coupled system for diverse applications are reviewed, with emphasis on electrospray mass spectrometry. Reaction mechanism studies, diagnostic applications, and activity imaging of electrodes are demonstrated based on approaches that were devised in our laboratory.     

Analysis of thermal emission processes of electrons from arrays of InAs quantum dots in the space charge region of GaAs matrix

We thoroughly analyze admittance spectroscopy data on the temperature dependence of the rate of electron emission from the ground state of InAs quantum dots in the space-charge layer of a Schottky barrier on an n-GaAs matrix. The experimental results are described using a one-dimensional model of thermally activated tunneling with the involvement of virtual states. The shape of the potential barrier to be overcome by emitted electrons is selected by introducing the effective concentration of shallow donors such that the electron binding energies in the quantum dots were similar to those determined from the measured capacitance-voltage characteristics of the investigated structures. The obtained electron-capture cross sections increase with the ground-state binding energy (quantum dot size). The capture cross-section values for InAs quantum dots with average lateral sizes of 9 and 20 nm lie in the ranges 1 × 10^?14?2 × 10^?13 and 4 × 10^?12?2 × 10^?11 cm².     

Micro-mechanical modelling of shear-driven fibre compressive failure and of fibre kinking for failure envelope generation in CFRP laminates

A micro-mechanical Finite Element (FE) model is used to investigate the failure mechanisms and generate failure envelopes for fibre reinforced composites under combined in-plane shear and longitudinal compressive loading. The results show that the failure envelopes are defined by two regions corresponding to different failure mechanisms: (i) shear-driven fibre compressive failure and (ii) kinking/splitting. The FE model is also used to reproduce and give insight into different experimental trends typically reported in the literature.     

The formation of a peroxoantimonate thin film coating on graphene oxide (GO) and the influence of the GO on its transformation to antimony oxides and elemental antimony

The ultrathin peroxoantimonate coating of graphene oxide from hydrogen peroxide-rich solutions of hydroxoantimonate is demonstrated. An amorphous 1–2 nm Sb (V) oxide film is formed and can be further crystallized by exposure to an electron beam to give a 2–5 nm thick supported Sb₆O₁₃ particulate coating. Heat treatment of the peroxoantimonate yielded different crystalline oxides, whereas in the presence of the graphene support only trigonal Sb (0) was produced by heat treatment in vacuum or an argon atmosphere. The graphene oxide support is essential for the formation of the Sb (0) phase and even in air a substantial elemental antimony was obtained. Whereas heat treatment of uncoated graphene oxide in an inert atmosphere produces reduced graphene oxide, the antimony oxide coated graphene oxide is not reduced by the heat treatment. Only after the supported antimony oxide is reduced to give the trigonal Sb (0) phase the graphene oxide was reduced by the heat treatment. The phases before and after the different heat treatments are characterized by electron and X-ray diffraction, thermal analysis, XPS studies, electron microscopy and wet chemistry.     

School Psychology Quarterly: A vision for the future from the new editor.

It is both a great honor and an exciting professional challenge to take on the responsibility of Editor for School Psychology Quarterly. My motivations for serving in this capacity stem from my fundamental belief that high-quality scholarship is essential to the health and vigor of school psychology. The mission I envision for the Quarterly is to be out in front of our field breaking new scientific, intellectual, and professional ground for the future, helping school psychology to "be all that it can be." At the macro-level, I have two clear objectives. First, I want to build on the very best accomplishments of my predecessors, Tom Kratochwill and Joe Witt, reinforcing foundational elements crucial to the journal's success. Second, and perhaps more importantly, I want to raise the Quarterly to a new level of excellence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Teachers' perceptions of control and preferences for consultative services.

Investigated the relationship between teacher feelings of control in dealing with common acting out, withdrawal, and academic types of student problems, and teachers' relative preference for consultation and referral services. 64 elementary school teachers responded to a modified Pupil Problem Behavioral Inventory. Higher feelings of control over student problems were significantly related to a preference for consultation rather than referral services. Results are consistent with prior research indicating that an internal locus of control is associated with increased efforts to obtain and utilize information. Implications for teacher use of and resistance to school-based consultative services are discussed. (31 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Compact steady-state and high-flux Falcon ion source for tests of plasma-facing materials

This paper describes the design and operation of the Falcon ion source. It is based on conventional design of anode layer thrusters. This ion source is a versatile, compact, affordable, and highly functional in the research field of the fusion materials. The reversed magnetic field configuration of the source allows precise focusing of the ion beam into small spot of ≈3 mm and also provides the limited capabilities for impurity mass-separation. As the result, the source generates steady-state ion beam, which irradiates surface with high heat (0.3 - 21 MW m(-2)) and particle fluxes (4 × 10(21) - 3 × 10(23) m(-2)s(-1)), which approaches the upper limit for the flux range expected in ITER.