Middle School Students\u27 Perspectives on What Teaching Strategies Work Best for Them

This study attempts to shed a light on the perspectives of middle school students on their middle school experience. This qualitative study was conducted with 18 middle school students located in the small, rural town in the northern part of the mid-west. Data showed that students want choices and options in their learning. Furthermore, they want to work with their peers in an active, comfortable, fun space. What this space looks like may differ for each student, which is why trust and an open line of communication between the student and teacher is key. They want to know that their input matters. Middle school is a time when students are venturing away from the security of elementary and into the independence of a high school setting. When so much is happening socially, emotionally, and physically that is beyond their control, giving them some power over their education can improve their self- worth and overall educational experience exponentially. Teachers need to be flexible and open to teaching to multiple abilities and maturities. This can prove difficult, which why allowing the student to have a say and take on the part of the learner and teacher can benefit both parties. Trust develops as students recognize they are being seen, they are being heard, and their needs are being met. This self- advocacy is a stepping-stone towards preparing them for responsibilities in their future-high school, college, and beyond

Vacuum ultraviolet holography

The authors report the first demonstration of holographic techniques in the vacuum ultraviolet spectral region. Holograms were produced with coherent 1182 A radiation. The holograms were recorded in polymethyl methacrylate and read out with an electron microscope. A holographic grating with a fringe spacing of 836 A was produced and far-field Fraunhofer holograms of sub-micron particles were recorded

Handbook for estimating toxic fuel hazards

Computer program predicts, from readily available meteorological data, concentration and dosage fields downwind from ground-level and elevated sources of toxic fuel emissions. Mathematical model is applicable to hot plume rise from industrial stacks and should also be of interest to air pollution meteorologists

TOWARD A GENERAL THEORY OF CONTROL KNOBS

Abstract Experience using hardware knobs as an operator interface for controlling equipment has varied considerably at different facilities. Reactions have ranged from "indispensable" at some facilities, to "virtually useless" at others. In this paper, we will attempt to outline some basic principles for successful knob implementation. These principles derive from our own experience with control knobs at the LANSCE Accelerator Complex and our recent effort to adapt our control knobs to EPICS. Topics to be covered include what the operator needs the knob to do, what the knob needs to know about the device it is controlling, and knob scaling issues. Advanced topics such as closedloop, PID, and aggregate knobs are left as topics for future papers

Implementing remote procedure calls with DECnet

The ''Remote Procedure Call'' (RPC) has recently become an important communication model for distributed systems. The basic idea behind remote procedure calls is that a process running on one machine can ''call'', using standard procedure calling semantics, another routine that executes on a different machine. A message-passing mechanism is used to transfer parameters between the caller and the called routine. In this paper, we describe a remote procedure call system we have implemented that uses DECnet as the underlying message-passing mechanism. Our system is highly reliable, reasonalbly efficient, and supports some advanced features such as asynchronous remote procedures. The described system is currently part of a distributed accelerator-control system containing VMS, Micro-VMS, and VAXELN nodes. It could also be extended to any other system that supports DECnet. Topics discussed include the system design, parameter-passing protocol, error detection and recovery, and performance

Novel utilization of powder-suspension hybrid feedstock in HVAF spraying to deposit improved wear and corrosion resistant coatings

Deployment of a suspension feedstock has been known to alleviate problems associated with using sub-micron and nanosized powder feedstock for thermal spraying of monolithic as well as powder-suspension ‘hybrid’ composite coatings. However, a powder-suspension hybrid feedstock has never been previously used in high-velocity air-fuel (HVAF) spraying. In this work, for the very first time, a chromium carbide (Cr3C2) suspension has been co-sprayed along with an Inconel-625 (IN-625) powder by the HVAF process as an illustrative case study. Two variants of the IN-625 + Cr3C2 hybrid coatings were produced by varying relative powder-suspension feed rates. For comparison, pure IN-625 coating was also deposited utilizing identical spray parameters. Detailed microstructural characterization, porosity content, hardness measurement and phase analysis of the as-deposited coatings was performed. The suspension-derived carbides were retained in the bulk of the coating, resulting in higher hardness. In the dry sliding wear test, the hybrid coatings demonstrated lower wear rate and higher coefficient of friction (CoF) compared to the conventional, powder-derived IN-625 coatings. Furthermore, the wear rate improved slightly with an increase in Cr3C2 content in the hybrid coating. Post-wear analysis of the worn coating, worn alumina ball and the wear debris was performed to understand the wear mechanisms and material transfer in the investigated coatings. In the potentiodynamic polarization test, higher corrosion resistance for hybrid coatings than conventional IN-625 coatings was achieved, indicating that the incorporation of a secondary, carbide phase in the IN-625 matrix did not compromise its corrosion performance. This work demonstrates a novel approach to incorporate any finely distributed second phase in HVAF sprayed coatings to enhance their performance when exposed to harsh environments

The effects of a plant proteinase inhibitor from Enterolobium contortisiliquum on human tumor cell lines

Supplementary to the efficient inhibition of trypsin, chymotrypsin, plasma kallikrein, and plasmin already described by the EcTI inhibitor from Enterolobium contortisiliquum, it also blocks human neutrophil elastase (K(iapp)=4.3 nM) and prevents phorbol ester (PMA)-stimulated activation of matrix metalloproteinase (MMP)-2 probably via interference with membrane-type 1 (MT1)-MMP. Moreover, plasminogen-induced activation of proMMP-9 and processing of active MMP-2 was also inhibited. Furthermore, the effect of EcTI on the human cancer cell lines HCT116 and HT29 (colorectal), SkBr-3 and MCF-7 (breast), K562 and THP-1 (leukemia), as well as on human primary fibroblasts and human mesenchymal stem cells (hMSCs) was studied. EcTI inhibited in a concentration range of 1.0-2.5 mu M rather specifically tumor cell viability without targeting primary fibroblasts and hMSCs. Taken together, our data indicate that the polyspecific proteinase inhibitor EcTI prevents proMMP activation and is cytotoxic against tumor cells without affecting normal tissue remodeling fibroblasts or regenerative hMSCs being an important tool in the studies of tumor cell development and dissemination

Handbook for estimating toxic fuel hazards Final report

Handbook for estimating toxic fuel hazard downwind from source emissions at Cape Kenned