Heat Determinant on Manifolds

We introduce and study new invariants associated with Laplace type elliptic partial differential operators on manifolds. These invariants are constructed by using the off-diagonal heat kernel; they are not pure spectral invariants, that is, they depend not only on the eigenvalues but also on the corresponding eigenfunctions in a non-trivial way. We compute the first three low-order invariants explicitly.Comment: 41 page

Evaluation of refractory/austenitic bimetal combinations Second quarterly progress report, 22 Sep. - 22 Dec. 1965

Evaluation of bond integrity of As-explosive bonded refractory/austenitic bimetal composites using tensile tests, hardness traverses, cold rolling, and metallographic analysi

Photodetachment study of He^- quartet resonances below the He(n=3) thresholds

The photodetachment cross section of He^- has been measured in the photon energy range 2.9 eV to 3.3 eV in order to investigate doubly excited states. Measurements were made channel specific by selectively detecting the residual He atoms left in a particular excited state following detachment. Three Feshbach resonances were found in the He(1s2p ^3P)+e^-(epsilon p) partial cross section: a ^4S resonance below the He(1s3s ^3S) threshold and two ^4P resonances below the He(1s3p ^3P) threshold. The measured energies of these doubly excited states are 2.959260(6) eV, 3.072(7) eV and 3.26487(4) eV. The corresponding widths are found to be 0.20(2) meV, 50(5) meV and 0.61(5) meV. The measured energies agree well with recent theoretical predictions for the 1s3s4s ^4S, 1s3p^2 ^4P and 1s3p4p ^4P states, respectively, but the widths deviate noticeably from calculations for 1s3p^2 ^4P and 1s3p4p ^4P states.Comment: 10 pages, 3 figures, LaTeX2e scrartcl, amsmath. Accepted by Journal of Physics B; minor changes after referee repor

Elastic Cross Sections for Electron Collisions with Molecules Relevant to Plasma Processing

Absolute electron-impact cross sections for molecular targets, including their radicals, are important in developing plasma reactors and testing various plasma processing gases. Low-energy electron collision data for these gases are sparse and only the limited cross section data are available. In this report, elastic cross sections for electron-polyatomic molecule collisions are compiled and reviewed for 17molecules relevant to plasma processing. Elastic cross sections are essential for the absolute scale conversion of inelastic cross sections, as well as for testing computational methods. Data are collected and reviewed for elastic differential, integral, and momentum transfer cross sections and, for each molecule, the recommended values of the cross section are presented. The literature has been surveyed through early 2010.This work is accomplished as a collaboration through APAN (Asia-Pacific Atomic Data Network: a network for dissemination of collisional data relevant to plasmas, discharges, materials, and biosciences). H.C. acknowledges a support by the National Research Foundation of Korea (Grant No. 20100000035), and M.J.B. and S.J.B. support from the Australian Research Council Center of Excellence for Antimatter-Matter Studies. Collaboration between NIFS and NFRI is also acknowledged for the Korea-Japan exchanges

Recommended Positron Scattering Cross Sections for Atomic Systems

We present a critical analysis of available experimental and theoretical cross section data for positron scattering from atomic systems. From this analysis, we present (where data are available) recommended cross sections for total scattering, positronium formation, inelastic scattering, and direct ionization processes. A complete bibliography of available measurement and theory is also presented.We are grateful for the support of the Australian Research Council (Grant Nos. DP140102854, DP150101521, and DP190100696) and our respective institutions—The University of Malaya, Flinders University, and the Australian National University

The barriers, benefits and training needs of clinicians delivering psychological therapy via video

BACKGROUND: Due to the COVID-19 pandemic, mental health services have had to offer psychological therapy via video with little time to prepare or mitigate potential problems. Identifying the barriers, benefits and training needs highlighted by clinicians may support the effective delivery of care. METHOD: Changes in the mode therapy sessions were delivered in during 2020 were assessed in two high-volume psychological therapies services. Sixty-six therapists completed a survey about their experiences of delivering therapy via video. RESULTS: The lockdown in March 2020 precipitated a dramatic shift from face-to-face to telephone and video-delivered sessions. Most clinicians (89%) found video-based sessions acceptable. Barriers to effective delivery included technological issues, problems with online platforms, and feeling more tired after sessions. Benefits included generalised learning from behavioural work, improvements in efficiency and in the therapeutic relationship, particularly in comparison with telephone-based sessions. Tutorials and support guides were recommended to maximise use of sessions via video. CONCLUSIONS: Video-delivered therapy was liked by clinicians and preferred to telephone-based sessions. Issues with platforms, internet connections and access for patients need addressing, local troubleshooting guides, video-based tutorials and greater support for low-intensity therapists to maximise uptake of video sessions where appropriate, may be beneficial