731 research outputs found
Probability Experiments in the Secondary School
No full textThis article, created by L.W. Gates of Gillingham Technical High School, describes complete instructions for two probability experiments targeting middle school aged students. The author states, "Probability theory is taught as part of the normal curriculum in most secondary schools, but it is not usually possible, due to shortage of time, lack of equipment, or teacher reluctance to perform probability experiments." This lesson attempts to alleviate these issues in a secondary school setting
Geographic profiling in Nazi Berlin: fact and fiction
No full textGeographic profiling uses the locations of connected crime sites to make inferences about the probable location of the offender’s ‘anchor point’ (usually a home, but sometimes a workplace). We show how the basic ideas of the method were used in a Gestapo investigation that formed the basis of a classic German novel about domestic resistance to the Nazis during the Second World War. We use modern techniques to re-analyse this case, and show that these successfully locate the Berlin home address of Otto and Elise Hampel, who had distributed hundreds of anti-Nazi postcards, after analysing just 34 of the 214 incidents that took place before their arrest. Our study provides the first empirical evidence to support the suggestion that analysis of minor terrorism-related acts such as graffiti and theft could be used to help locate terrorist bases before more serious incidents occur
Investigation of Hydrogen Sulfide Stress Corrosion Cracking of PH 13-8 Mo Stainless Steel
No full textThe influence of aging treatments on sulfide stress corrosion cracking of PH 13-8 Mo steel welds
No full textBilateral and unilateral arm training improve motor function through differing neuroplastic mechanisms: a single-blinded randomized controlled trial
No full textBACKGROUND AND PURPOSE:
This randomized controlled trial tests the efficacy of bilateral arm training with rhythmic auditory cueing (BATRAC) versus dose-matched therapeutic exercises (DMTEs) on upper-extremity (UE) function in stroke survivors and uses functional magnetic resonance imaging (fMRI) to examine effects on cortical reorganization.
METHODS:
A total of 111 adults with chronic UE paresis were randomized to 6 weeks (3×/week) of BATRAC or DMTE. Primary end points of UE assessments of Fugl-Meyer UE Test (FM) and modified Wolf Motor Function Test Time (WT) were performed 6 weeks prior to and at baseline, after training, and 4 months later. Pretraining and posttraining, fMRI for UE movement was evaluated in 17 BATRAC and 21 DMTE participants.
RESULTS:
The improvements in UE function (BATRAC: FM Δ = 1.1 + 0.5, P = .03; WT Δ = -2.6 + 0.8, P < .00; DMTE: FM Δ = 1.9 + 0.4, P < .00; WT Δ = -1.6 + 0.7; P = .04) were comparable between groups and retained after 4 months. Satisfaction was higher after BATRAC than DMTE (P = .003). BATRAC led to significantly higher increase in activation in ipsilesional precentral, anterior cingulate and postcentral gyri, and supplementary motor area and contralesional superior frontal gyrus (P < .05). Activation change in the latter was correlated with improvement in the WMFT (P = .01).
CONCLUSIONS:
BATRAC is not superior to DMTE, but both rehabilitation programs durably improve motor function for individuals with chronic UE hemiparesis and with varied deficit severity. Adaptations in brain activation are greater after BATRAC than DMTE, suggesting that given similar benefits to motor function, these therapies operate through different mechanisms
Highly Active W-H2SO4/HZSM-5 Catalyst for Direct Conversion of Methane into Aromatic
No full textDehydroaromatization of methane (DHAM) under non oxidative condition was studied over tungsten
loaded HZSM-5 catalysts to produce aromatic hydrocarbons. The catalysts were prepared by impregnation
method using different conditions : in neutral and acidified solution. The activity of W/HZSM-5 prepared by
neutral solution and W-H2SO4/HZSM-5 prepared in acidified condition were compared. The results showed
that the optimum activity of W-H2SO4/HZSM-5 catalyst exceeded that of W/HZSM-5 catalyst. The effect of
Si/Al ratio of W-H2SO4/HZSM-5 catalyst was also studied. The W-H2SO4/HZSM-5 catalyst with Si/Al ratio =
30 was found to be the most promising for the DHAM reaction. The remarkable activity of the catalyst is
attributed to the presence of dual effects: suitable content of octahedral polymeric and tetrahedral monomeric
tungstate species accompanied by proper amount and strength of acid sites in the catalyst
Interview of L.W. Jay, February 21, 2010
No full textThis is a recording of a woman interviewing L.W. Jay who worked in the Atlanta Rome district. He states he started working for the church in 1958 or 1959, and was appointed as minister of Butler Street in the 1960s, and was appointed by Peter Randolph Shy. He talks about how during his tenure, churches moved, sold and were built depending on the congregation, and the culture of the different churches. He lists the churches that were under his direction, and how some other churches suffered financial problems and pulled out of districts. He talks about situations happening in the different churches, mainly from the Hosley Temple and Mount Sinai churches.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the National Endowment for Humanities - Humanities Collections and Reference Resources Implementation Project Grant in supporting the processing and digitization of a number of its major archival collections as part of the project: Spreading the Word: Expanding Access to African American Religious Archival Collections at the Atlanta University Center Robert W. Woodruff Library
Chemical interaction of B4C, B, and C with Mo/Si layered structures
No full textTo enhance the thermal stability, B4C diffusion barrier layers are often added to Mo/Si multilayer structures for extreme ultraviolet optics. Knowledge about the chemical interaction between B4C and Mo or Si, however is largely lacking. Therefore, the chemical processes during annealing up to 600?°C of a Mo/B4C/Si layered structure have been investigated in situ with hard x-ray photoelectron spectroscopy and ex situ with depth profiling x-ray photoelectron spectroscopy. Mo/B/Si and Mo/C/Si structures have also been analyzed as reference systems. The chemical processes in these systems have been identified, with two stages being distinguished. In the first stage, B and C diffuse and react predominantly with Mo. MoSix forms in the second stage. If the diffusion barrier consists of C or B4C, a compound forms that is stable up to the maximum probed temperature and annealing time. We suggest that the diffusion barrier function of B4C interlayers as reported in literature can be caused by the stability of the formed compound, rather than by the stability of B4C itself.Materials Science and EngineeringMechanical, Maritime and Materials Engineerin
Interactions of C in layered Mo–Si structures
No full textAbstractInterdiffusion of a few nanometers thick C layer with Mo and Si under annealing at a temperature of 600°C was studied using X-ray photoelectron spectroscopy sputter depth profiling. A strong diffusion asymmetry of C in a Mo–Si layered structure is observed. C does interdiffuse with Mo, however, even at 600°C, no interdiffusion of Si and C was observed. Based on these results, the thermal stability of Mo/Si-based layer structures was improved by depositing a Si/C/Mo2C/C/Si layer structure. This structure shows superior thermal stability at 600°C compared to the Mo2C/Si and Mo/Si layer structure
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