scholarly journals Preliminary Investigation on Systems for the Preventive Diagnosis of Faults on Agricultural Operating Machines

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1547
Author(s):  
Massimo Cecchini ◽  
Francesca Piccioni ◽  
Serena Ferri ◽  
Gianluca Coltrinari ◽  
Leonardo Bianchini ◽  
...  

This paper aims to investigate failures induced by vibrations on machines, focusing on agricultural ones. The research on literature has brought to light a considerable amount of data on the driven vehicles and not much on the operating machines, including the ones that we looked for. For this reason, it was decided to direct a survey with the people who work with agricultural machinery every day: operators, sub-contractors, and producers. They were asked about the most frequent breakage, particularly in relation to the rotary harrow, the topic of this work. The questionnaire results showed the types of failures the harrow is most vulnerable to, indicating the times of failure and reparation and the need to set up a potentially useful preventive maintenance supporting system on these machines. Part of the work was then focused on the proposition of a method to investigate bearing failures in the rotary harrow, considering that these have been analyzed in the technical literature and in the survey as the most at-risk components. The proposed method in this work serves as a beginning for the development of a future on board sent-shore-based maintenance system for continuous monitoring of the bearing.

Mathematics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 913
Author(s):  
Juan Eloy Ruiz-Castro

A complex multi-state redundant system with preventive maintenance subject to multiple events is considered. The online unit can undergo several types of failure: both internal and those provoked by external shocks. Multiple degradation levels are assumed as both internal and external. Degradation levels are observed by random inspections and, if they are major, the unit goes to a repair facility where preventive maintenance is carried out. This repair facility is composed of a single repairperson governed by a multiple vacation policy. This policy is set up according to the operational number of units. Two types of task can be performed by the repairperson, corrective repair and preventive maintenance. The times embedded in the system are phase type distributed and the model is built by using Markovian Arrival Processes with marked arrivals. Multiple performance measures besides the transient and stationary distribution are worked out through matrix-analytic methods. This methodology enables us to express the main results and the global development in a matrix-algorithmic form. To optimize the model, costs and rewards are included. A numerical example shows the versatility of the model.


Author(s):  
Aria Dimas Harapan

ABSTRACTThe essence of this study describes the theoretical study of the phenomenon transfortation services online. Advances in technology have changed the habits of the people to use online transfortation In fact despite legal protection in the service based services transfortation technological sophistication has not been formed and it became warm conversation among jurists. This study uses normative juridical research. This study found that the first, the Government must accommodate transfotation online phenomenon in the form of rules that provide legal certainty; second, transfortation online as part of the demands of the times based on technology; third, transfortation online as part of the creative economy for economic growth . 


2018 ◽  
Vol 15 (1) ◽  
pp. 31
Author(s):  
Nur Aiman Suparlan ◽  
Muhammad Azrul Ku Ayob ◽  
Hazrina Ahmad ◽  
Siti Hawa Hamzah ◽  
Mohd Hisbany Mohd Hashim

A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre self-compacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3-ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro-crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction. 


2016 ◽  
Vol 2 (2) ◽  
pp. 129
Author(s):  
Urtak Hamiti

Barbaric, savage, horrific-these were terms to define the decision of the Islamic State of Iraq and Syria (ISIS) to murder its captured Jordanian pilot by burning him alive inspired a thesaurus of horror and revulsion. The men who did it, the perpetrators were described by the media as mad men, thugs, monsters. To most of the people, the act itself seemed inexplicable and without sense. However, behind the choreographed and videotaped violence lies a calculated horrible cold logic. Although, ISIS is often portrait as a mighty force on the ground in Syria and Iraq, facts state that they control mainly communications between various provinces in both countries, and, as most guerrilla armies, are militarily weak by conventional measure. ISIS has little or almost none defense against the bombing campaign that is facing now, while US has formed a coalition that is confronting them on the ground as well, after President Barack Obama published the “New Security Doctrine” which includes degrading and finally destroying ISIS. ISIS, however, have proven to be very organized in promoting dramatic acts of violence against their enemies and promoting them two achieve two goals: use terror tactics as a psychological weapon against all those facing them and all those that are to face them in combat. Secondly, through usage of social network platforms to promote killings and executions, the aim of ISIS is to encourage recruits from out of Syria and Iraq, and elsewhere, to join them in their cause. Online operations of ISIS fall under a production group called the Al Hayat Media Center. The Center was created to seduce Westerners into joining the ranks of ISIS and also to distribute propaganda through social and media platforms. It is difficult to assess the success of this operation, but solid sources provided by US military and intelligence estimate that at least 300 Americans are fighting in the ranks of ISIS (at least two Americans have been killed fighting for ISIS in Iraq/Syria region) while the number of Europeans is in thousands. The US Response to this psychological kind of warfare came when President Barack Obama established the Center for Strategic Counterterrorism Communications (CSCC) aiming to combat terrorist propaganda. The main strategy of CSCC is not directly to confront ISIS operatives, but rather than that to deal with the people they are trying to recruit. Now, with almost entire international public opinion on their side, it is time for US to more actively respond to ISIS especially in the manner of psychological warfare since it is obvious that operations of “winning hearts and minds” of people in Iraq and Syria are not enough compared to ruthless tactics of ISIS which “winning hearts and minds” by brute force, terror, and vivid violent images. The online propaganda war is a new component to conflicts of 21st century that allows enemies to reach one another’s home fronts directly. ISIS might seem not so strong on the ground but it has captured one fundamental flaw of the media of 21st century-the one that bad news is always good news and that televised violence will always have an audience. ISIS has proclaimed that its goal is to create a caliphate of 21st century but its psychological warfare and propaganda is inspiring individuals throughout the West to commit horrible terrorist crimes. Could this be another mind game set up by ISIS, it remains to be seen. However one thing is for certain, US and its allies must tackle ISIS not only by planes and other military means, but also by a strategy that would eliminate its influence in spreading their propaganda.


Globus ◽  
2020 ◽  
Author(s):  
I. Bagandova ◽  

This study is devoted to the study of the features of the archetype of the Dargins, the formation of which dates back to the times of paganism and, which was imprinted by both religious ideas and historical events that had a significant impact on the worldview and worldview of the people. This work is the first attempt to analyze the archetype of the Dargins from the point of view of its inherent fatalism on the basis of proverbs, sayings and legends of the Dargin people, which represent the wealth of oral folk art and reflect the specifics of the psychological formation of the people that have been taking shape for millennia


Tomography ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 39-54
Author(s):  
Veerle Kersemans ◽  
Stuart Gilchrist ◽  
Philip Danny Allen ◽  
Sheena Wallington ◽  
Paul Kinchesh ◽  
...  

Standardisation of animal handling procedures for a wide range of preclinical imaging scanners will improve imaging performance and reproducibility of scientific data. Whilst there has been significant effort in defining how well scanners should operate and how in vivo experimentation should be practised, there is little detail on how to achieve optimal scanner performance with best practices in animal welfare. Here, we describe a system-agnostic, adaptable and extensible animal support cradle system for cardio-respiratory-synchronised, and other, multi-modal imaging of small animals. The animal support cradle can be adapted on a per application basis and features integrated tubing for anaesthetic and tracer delivery, an electrically driven rectal temperature maintenance system and respiratory and cardiac monitoring. Through a combination of careful material and device selection, we have described an approach that allows animals to be transferred whilst under general anaesthesia between any of the tomographic scanners we currently or have previously operated. The set-up is minimally invasive, cheap and easy to implement and for multi-modal, multi-vendor imaging of small animals.


Author(s):  
Anna Zulauf-Czaja ◽  
Manaf K. H. Al-Taleb ◽  
Mariel Purcell ◽  
Nina Petric-Gray ◽  
Jennifer Cloughley ◽  
...  

Abstract Background Regaining hand function is the top priority for people with tetraplegia, however access to specialised therapy outwith clinics is limited. Here we present a system for hand therapy based on brain-computer interface (BCI) which uses a consumer grade electroencephalography (EEG) device combined with functional electrical stimulation (FES), and evaluate its usability among occupational therapists (OTs) and people with spinal cord injury (SCI) and their family members. Methods Users: Eight people with sub-acute SCI (6 M, 2F, age 55.4 ± 15.6) and their caregivers (3 M, 5F, age 45.3 ± 14.3); four OTs (4F, age 42.3 ± 9.8). User Activity: Researchers trained OTs; OTs subsequently taught caregivers to set up the system for the people with SCI to perform hand therapy. Hand therapy consisted of attempted movement (AM) of one hand to lower the power of EEG sensory-motor rhythm in the 8-12 Hz band and thereby activate FES which induced wrist flexion and extension. Technology: Consumer grade wearable EEG, multichannel FES, custom made BCI application. Location: Research space within hospital. Evaluation: donning times, BCI accuracy, BCI and FES parameter repeatability, questionnaires, focus groups and interviews. Results Effectiveness: The BCI accuracy was 70–90%. Efficiency: Median donning times decreased from 40.5 min for initial session to 27 min during last training session (N = 7), dropping to 14 min on the last self-managed session (N = 3). BCI and FES parameters were stable from session to session. Satisfaction: Mean satisfaction with the system among SCI users and caregivers was 3.68 ± 0.81 (max 5) as measured by QUEST questionnaire. Main facilitators for implementing BCI-FES technology were “seeing hand moving”, “doing something useful for the loved ones”, good level of computer literacy (people with SCI and caregivers), “active engagement in therapy” (OT), while main barriers were technical complexity of setup (all groups) and “lack of clinical evidence” (OT). Conclusion BCI-FES has potential to be used as at home hand therapy by people with SCI or stroke, provided it is easy to use and support is provided. Transfer of knowledge of operating BCI is possible from researchers to therapists to users and caregivers. Trial registration Registered with NHS GG&C on December 6th 2017; clinicaltrials.gov reference number NCT03257982, url: https://clinicaltrials.gov/ct2/show/NCT03257982.


2017 ◽  
Vol 63 (2) ◽  
pp. 265-283
Author(s):  
Subhendu Ranjan Raj

Development process in Odisha (before 2011 Orissa) may have led to progress but has also resulted in large-scale dispossession of land, homesteads, forests and also denial of livelihood and human rights. In Odisha as the requirements of development increase, the arena of contestation between the state/corporate entities and the people has correspondingly multiplied because the paradigm of contemporary model of growth is not sustainable and leads to irreparable ecological/environmental costs. It has engendered many people’s movements. Struggles in rural Odisha have increasingly focused on proactively stopping of projects, mining, forcible land, forest and water acquisition fallouts from government/corporate sector. Contemporaneously, such people’s movements are happening in Kashipur, Kalinga Nagar, Jagatsinghpur, Lanjigarh, etc. They have not gained much success in achieving their objectives. However, the people’s movement of Baliapal in Odisha is acknowledged as a success. It stopped the central and state governments from bulldozing resistance to set up a National Missile Testing Range in an agriculturally rich area in the mid-1980s by displacing some lakhs of people of their land, homesteads, agricultural production, forests and entitlements. A sustained struggle for 12 years against the state by using Gandhian methods of peaceful civil disobedience movement ultimately won and the government was forced to abandon its project. As uneven growth strategies sharpen, the threats to people’s human rights, natural resources, ecology and subsistence are deepening. Peaceful and non-violent protest movements like Baliapal may be emulated in the years ahead.


2021 ◽  
pp. 002087282110489
Author(s):  
Heino Stöver ◽  
Daniela Jamin ◽  
Marie Jauffret-Roustide ◽  
Laurent Michel ◽  
Vânia Mendes ◽  
...  

Social work in prisons is linked to specific tasks regarding the care for the people who are incarcerated. A multi-country qualitative study was set up to explore drug users’ and professionals’ perceptions of continuity of care in prison and beyond. It has been pointed out that continuity of care is associated with different barriers, especially regarding social work. Nevertheless, good practice examples do exist and could be implemented by social workers. Social workers and opioid users face challenges in the context of imprisonment, so different measures need to be implemented to support opioid users and for social workers to support them.


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