Self modulated dynamics of a relativistic charged particle beam in plasma wake field excitation

Self modulated dynamics of a relativistic charged particle beam is reviewed within the context of the theory of plasma wake field excitation. The self-consistent description of the beam dynamics is provided by coupling the Vlasov equation with a Poisson-type equation relating the plasma wake potential to the beam density. An analysis of the beam envelope self-modulation is then carried out and the criteria for the occurrence of the instability are discussed thereby.Comment: This is a 10 pages manuscript which contain 4 figures. This manuscript is recently submitted in 'Nuclear Instruments and Methods in Physics Research Section A' as a proceeding of the conference 'EAAC 2015

Risk Assessment at the Cosmetic Product Manufacturer by Expert Judgment Method

A case study was performed in a cosmetic product manufacturer. We have identified the main risk factors of occupational accidents and their causes. Risk of accidents is assessed by the expert judgment method. Event tree for the most probable accident is built and recommendations on improvement of occupational health and safety protection system at the cosmetic product manufacturer are developed. The results of this paper can be used to develop actions to improve the occupational safety and health system in the chemical industry

Initial fixation placement in face images is driven by top-down guidance

The eyes are often inspected first and for longer period during face exploration. To examine whether this saliency of the eye region at the early stage of face inspection is attributed to its local structure properties or to the knowledge of its essence in facial communication, in this study we investigated the pattern of eye movements produced by rhesus monkeys (Macaca mulatta) as they free viewed images of monkey faces. Eye positions were recorded accurately using implanted eye coils, while images of original faces, faces with scrambled eyes, and scrambled faces except for the eyes were presented on a computer screen. The eye region in the scrambled faces attracted the same proportion of viewing time and fixations as it did in the original faces, even the scrambled eyes attracted substantial proportion of viewing time and fixations. Furthermore, the monkeys often made the first saccade towards to the location of the eyes regardless of image content. Our results suggest that the initial fixation placement in faces is driven predominantly by ‘top-down’ or internal factors, such as the prior knowledge of the location of “eyes” within the context of a face

A deficit of spatial remapping in constructional apraxia after right-hemisphere stroke

This Article is provided by the Brunel Open Access Publising Fund - Copyright @ 2010 Oxford University PressConstructional apraxia refers to the inability of patients to copy accurately drawings or three-dimensional constructions. It is a common disorder after right parietal stroke, often persisting after initial problems such as visuospatial neglect have resolved. However, there has been very little experimental investigation regarding mechanisms that might contribute to the syndrome. Here, we examined whether a key deficit might be failure to integrate visual information correctly from one fixation to the next. Specifically, we tested whether this deficit might concern remapping of spatial locations across saccades. Right-hemisphere stroke patients with constructional apraxia were compared to patients without constructional problems and neurologically healthy controls. Participants judged whether a pattern shifted position (spatial task) or changed in pattern (non-spatial task) across two saccades, compared to a control condition with an equivalent delay but without intervening eye movements. Patients with constructional apraxia were found to be significantly impaired in position judgements with intervening saccades, particularly when the first saccade of the sequence was to the right. The importance of these remapping deficits in constructional apraxia was confirmed through a highly significant correlation between saccade task performance and constructional impairment on standard neuropsychological tasks. A second study revealed that even single saccades to the right can impair constructional apraxia patients’ perception of location shifts. These data are consistent with the view that rightward eye movements result in loss of remembered spatial information from previous fixations, presumably due to constructional apraxia patients’ damage to the right-hemisphere regions involved in remapping locations across saccades. These findings provide the first evidence for a deficit in remapping visual information across saccades underlying right-hemisphere constructional apraxia.European Commission Marie Curie Intra-European Fellowship (011457 to C.R.) and a Wellcome Trust Senior Fellowship (to M.H.)

パキスタン ニ ハッセイ シタ トマトマキバビョウ ヲ ヒキオコス タンイツゲノムセイ ベゴモヴィルス オヨビ ベータサテライトノ カンセンショウ クローン ニ ヨル カンセンショウ カイセキ

インドのワタに壊滅的な被害をもたらす単一ゲノム性 Begomovirus 属ウイルスである Cotton leaf curl Rajasthan virus(CLCuRaV)がパキスタンの Faisalabad で栽培されるトマト(Solanum lycopersicum)から,DNA サテライト[CLCuRaB-(PK:Sβ2:07)]とともに分離され,CLCuRaV-(PK:SA1:07)と同定された。両者の感染性クローン(CLCuRaV^tomato および CLCuRaB^tomato)を構築し,Agrobacterium GV3101 系統に形質転換した。CLCuRaV^tomato を Nicotiana benthamiana とトマトに,単独で,あるいは,CLCuRaB^tomato と共接種したところ,3反復おこなった CLCuRaV^tomato 単独接種実験では,N. benthamiana 36株中 3株のみで非常に軽微な病徴を呈し,トマトには感染が認められなかった。しかし,サテライトDNA感染性クローン CLCuRaB^tomato との共接種によると,N. benthamiana では100%の感染が認められ激しい病徴を呈し,トマトでは穏やかな病徴ではあるが 70-80%の感染が認められた。CLCuRaB^tomato の存在により CLCuRaV^tomato の病徴が N. benthamiana およびトマトにおいて激化した。これにより,トマトから分離したワタのウイルスであるCLCuRaV^tomato の実験用宿主 N. benthamiana と野外宿主トマトにおける感染性を実験的にはじめて確認した。Cotton leaf curl Rajasthan virus (CLCuRaV), a monopartite begomovirus causing devastating losses of cotton crop in India, was isolated from tomato (Solanum lycopersicum) along with DNA satellite (CLCuRaB^tomato) and characterized in Faisalabad, Pakistan. Infectious clones of CLCuRaV^tomato and CLCuRaB^tomato were produced and transformed into Agrobacterium strain GV3101. A partial tandem re peat construct of CLCuRaV^tomato was inoculated to Nicotiana benthamiana and tomato plants alone and/or with CLCuRaB^tomato. CLCuRaV^tomato alone produced very mild symptoms in N. benthamiana plants, whereas tomato plants showed no symptoms by inoculation with CLCuRaV^tomato in the absence of CLCuRaB^tomato. In N. benthamiana plants 100% infection followed by severe symptoms was observed while in tomato plants 70-80% infection with mild symptoms was observed on coinoculation with CLCuRaV^tomato and CLCuRaB^tomato. Symptoms severity of CLCuRaV^tomato increased in the presence of CLCuRaB^tomato in N. benthamiana and tomato plants. Here we demonstrated the first experimental pathogenicity analysis of a cotton virus isolated from tomato plants both in N. benthamiana and tomato plants

Examining the Social Validity of a Universal Intervention for Reducing Exclusionary Discipline through Stakeholder Voice

45 pagesExclusionary disciplinary practices are utilized in schools despite limited benefits and associated negative student outcomes. Alternative strategies, such as Positive Behavioral Interventions and Supports, reduce exclusionary discipline practices, though research is limited in secondary settings. This study examines how student and school staff input was utilized throughout the iterative refinement of the Inclusive Skill-building Learning Approach (ISLA), an intervention to reduce exclusionary discipline practices in middle school through instructional and restorative practices. Intentional stakeholder involvement was hypothesized to impact acceptability and fidelity of implementation, critical for achieving intervention outcomes. Data across a two-year mixed methods approach indicate that engaging stakeholders throughout implementation enhanced fidelity. Quantitative findings demonstrate better understanding of stakeholder experiences. Implications for practice, limitations, and suggestions for future research are discussed.Grant R305A180006, Institute of Education Sciences, U.S. Department of Educatio