Dynamic structure selection and instabilities of driven Josephson lattice in high-temperature superconductors

We investigate the dynamics of the Josephson vortex lattice in layered high-T$_{c}$ superconductors at high magnetic fields. Starting from coupled equations for superconducting phases and magnetic field we derive equations for the relative displacements [phase shifts] between the planar Josephson arrays in the layers. These equations reveal two families of steady-state solutions: lattices with constant phase shifts between neighboring layers, starting from zero for a rectangular configuration to $\pi$ for a triangular configuration, and double-periodic lattices. We find that the excess Josephson current is resonantly enhanced when the Josephson frequency matches the frequency of the plasma mode at the wave vector selected by the lattice structure. The regular lattices exhibit several kinds of instabilities. We find stability regions of the moving lattice in the plane lattice structure - Josephson frequency. A specific lattice structure at given velocity is selected uniquely by boundary conditions, which are determined by the reflection properties of electromagnetic waves generated by the moving lattice. With increase of velocity the moving configuration experiences several qualitative transformations. At small velocities the regular lattice is stable and the phase shift between neighboring layers smoothly decreases with increase of velocity, starting from $\pi$ for a static lattice. At the critical velocity the lattice becomes unstable. At even higher velocity a regular lattice is restored again with the phase shift smaller than $\pi/2$. With increase of velocity, the structure evolves towards a rectangular configuration.Comment: 28 pages, 12 figures, submitted to Phys. Rev.

Behavioral integrity for safety, priority of safety, psychological safety, and patient safety: a team-level study

This article clarifies how leader behavioral integrity for safety helps solve follower's double bind between adhering to safety protocols and speaking up about mistakes against protocols. Path modeling of survey data in 54 nursing teams showed that head nurse behavioral integrity for safety positively relates to both team priority of safety and psychological safety. In turn, team priority of safety and team psychological safety were, respectively, negatively and positively related with the number of treatment errors that were reported to head nurses. We further demonstrated an interaction effect between team priority of safety and psychological safety on reported errors such that the relationship between team priority of safety and the number of errors was stronger for higher levels of team psychological safety. Finally, we showed that both team priority of safety and team psychological safety mediated the relationship between leader behavioral integrity for safety and reported treatment errors. These results suggest that although adhering to safety protocols and admitting mistakes against those protocols show opposite relations to reported treatment errors, both are important to improving patient safety and both are fostered by leaders who walk their safety talk

Safety culture maturity in several latin America mining activities

Health and safety is a crucial issue in the mining industry because of the implication of fatalities in this sector. A study of safety culture maturity in several Latin America countries has been done based on the model from Filho et al. [1]. The questionnaire includes 28 items regarding the type of activity, number of employees and safety culture characteristics of the activity: Information of accidents and misses, organizational structure to deal with the information, involvement of the company in health and safety issues, the way it communicates accidents and misses and commitment of the company towards health and safety. The questionnaire was completed by 58 mining company managers from Bolivia, Peru, Colombia and Mexico. Results show different behaviours depending on the type of company, cooperative or private company. When private companies are analysed, it is seen a level of maturity according to the size of the company, whereas cooperatives does not have a clear trend in terms of size apart from very small cooperatives, less than 10 employees. However, there is a remarkable difference between cooperatives that have implemented continuous improvement systems and the others. In particular, cooperatives with a continuous improvement system have been analysed, displaying much higher safety culture levels. Therefore, it can be concluded that private companies improve their level of safety culture as the size of the company increase, because procedures and control systems are implemented. When cooperative or small companies introduce similar systems they also achieve substantial gains, but their approach is different. Managers from cooperatives have to see economic reasons to implement it, such as the Fairmined certificate.Peer ReviewedPostprint (published version

Reasoned opinion on the modification of the existing MRLs for dimethomorph in several vegetable crops

<p>In accordance with Article 6 of Regulation (EC) No 396/2005, Germany received three applications from BASF SE to modify or set MRLs for the active substance dimethomorph. In order to accommodate for the intended uses of dimethomorph, Germany proposed to raise the existing MRL from the LOQ of 0.05 mg/kg to 3 mg/kg in leafy brassica, from 1 mg/kg to 5 mg/kg on scarole, whereas an amendment of the existing MRLs was not necessary for cress and land cress, and to set import tolerances at 4 mg/kg on flowering brassica, 15 mg/kg on lettuce and celery and 0.6 mg/kg on garlic, onions and shallots. Germany drafted three separate evaluation reports according to Article 8 of Regulation (EC) No 396/2005 which were submitted to the European Commission and forwarded to EFSA, which addressed these applications in a single reasoned opinion. According to EFSA the data are sufficient to derive MRL proposals of 3 mg/kg for leafy brassica, 6 mg/kg for scarole (outdoor use in Southern Europe), while the existing MRL of 10 mg/kg supports the intended indoor/outdoor uses on cress and land cress and no amendment is necessary. The following import tolerances are proposed: 0.6 mg/kg for onion, garlic and shallot, 15 mg/kg for lettuce and celery. The values of 7 mg/kg and 5 mg/kg for head cabbage and broccoli, respectively, are proposed assuming that the modification of the GAP authorised in the USA will be approved. Adequate analytical methods are available to monitor the residues of dimethomorph in the commodities under consideration at the validated LOQ of 0.01 mg/kg. Based on the risk assessment results, EFSA concludes that the proposed uses under consideration (except the indoor use on scarole) will not result in a consumer exposure exceeding the toxicological reference values and therefore will not pose a public health concern.</p&gt

Accident Rate as a Measure of Safety Assessment in Polish Civil Engineering

Civil engineering is characterised by high volatility with respect to working conditions, which are the source of many threats to worker life and health and contribute to high accident rates. The purpose of this paper is to analyse and evaluate the phenomenon of accidents in Polish civil engineering and define the direction of changes that should occur in the safety area. The studies included in this research covered the years 2004–2018. The following indicators were used to assess the accident rates: (1) The total number of persons injured in workplace accidents and this total divided into fatal, severe, and minor accidents; (2) indicators of frequency of accidents in total and this total divided into minor, severe, and fatal accidents; (3) and an indicator of the severity of accidents. From the analysis of statistical data for the years 200–2018, the changes in accident rate parameters demonstrate the continuous improvement of workplace safety in the Polish civil engineering sector. From the analysed data from the 15 years, a clear decrease in the value of the applied indicators is apparent, including both the number of people involved in accidents and the frequency and severity of accidents

Safety management practices in the Malaysia Technical And Vocational Education Training (TVET)

For many years, the value of safety management practice has been the subject of research attention in many sectors in Malaysia in order to achieve a positive workplace safety climate. The practice of safety management among accredited centers in the education sector, however, has hardly been examined. This study was therefore conducted in Johor, Malaysia, to investigate the elements of the safety management practices in the Technical and Vocational Education Training (TVET). This research included seven participants consisting of safety and health (SH) coordinators from each accredited TVET center in Johor, Malaysia. Via interview data collection, this study used the full qualitative approach. The outcome of the thematic analysis showed that there are ten key elements of safety management practices that have become factors among accredited TVET centers in Johor, namely management commitment, safety policy, safety committee, instructor involvement, safety rules and procedure, safety training, safety audit, risk management, communication and feedback and also safety promotion. The accredited center is advised to pay attention to these ten elements in order to improve safety management practices in the TVET sector

Statement on the dietary risk assessment for proposed temporary maximum residue levels (t-MRLs) for fosetyl-Al in certain crops

In accordance with Article 43 of Regulation (EC) No 396/2005, the European Commission requested EFSA to perform a dietary risk assessment of the proposed temporary MRLs for fosetyl-Al. These temporary MRLs should accommodate for residues found in different commodities which are according to food business operators most likely resulting from the use of foliar phosphorous fertilizers which could mimic the treatment with fosetyl-Al. The European Commission proposed to raise the existing MRLs as a proportionate risk management measure on a temporary basis to avoid market disruptions, provided that the proposed temporary MRLs do not pose a consumer heath risk. EFSA concludes that the overall dietary exposure to fosetyl-Al (sum of fosetyl and phosphonic acid and their salts expressed as fosetyl) linked to the proposed temporary MRLs for the crops under assessment and the existing MRLs for other commodities covered by the EU MRL legislation is not expected to result in a consumer exposure exceeding the toxicological reference values for fosetyl. Considering that the exposure assessment was performed with a conservative approach which is likely to overestimate the real exposure, EFSA concludes that the proposed temporary MRLs are unlikely to pose a consumer health risk. Since the source of the occurrence of the residues in the crops under consideration is not clarified, the conclusions of the risk assessment are restricted to the identified residues of phosphonic acid. EFSA derived several recommendations to be considered by risk managers to identify the source of the contamination aiming to reduce the uncertainties of the risk assessment

A STUDY OF WORK SAFETY BEHAVIOR AT PT. AST INDONESIA SEMARANG

The aim of this study is to analyse the effect of Safety Leadership, Safety Culture and Safety Training that influences the employee Safety Behavior at PT. AST Indonesia Semarang. Mixed methods with sequential explanatory type approach was utilized in this study. The quantitative instruments were using SEM methods while Indonesian and Japanese manager interview was used for the qualitative instrument. The study involved 100 employees as the questionnaire respondents from 600 production employees population and 3 manager as intervieweer. Simple random sampling was use at quantitative research with a proportional quantity of responden have taken in every department depend on total employee in each department. The validation of qualitative result have used by honest validation from respondens which was confirmated and approved by responden’s with their signature at qualitative question and answer list. Based on the result of the quantitative and qualitative data, the research hypothesis conclusion for Safety Leadership, Safety Culture and Safety Training effect is positive and significant to Safety Behavior and the other findings at this research could be explained that the direct effect of Safety Culture to Safety Training (0.646) more than Safety Leadership effect to Safety Training (0.217). In other side Safety Leadership effect to Safety Behavior (0.386) more than Safety Culture effect to Safety Behavior (0.297). The indirect effect between Safety Leadership (0.08) and Safety Culture (0.239) to Safety Behavior was lower than the direct effect, this result shown that Safety Training is not an intervining variable on this research