Análise tribológica de um sistema de acionamento alternativo de pigs para a indústria do petróleo

It is analyzed through the concepts of tribology and mechanical contact and damage the suggestion of implementing a backup system for traction and passage of Pipeline Inspection Gauge (Pig) from the inside of pipelines. In order to verify the integrity of the pipelines, it is suggested the possibility of displacement of such equipment by pulling wires with steel wires. The physical and mechanical characteristics of this method were verified by accelerated tests in the laboratory in a tribological pair, wire versus a curve 90. It also considered the main mechanisms of wear of a sliding system with and without lubricant, in the absence and presence of contaminants. To try this, It was constructed a test bench able to reproduce a slip system, work on mode back-and-forth ("reciprocation"). It was used two kinds of wires, a galvanized steel and other stainless steel and the results achieved using the two kinds of steel cables were compared. For result comparative means, it was used steel cables with and without coating of Poly Vinyl Chloride (PVC). The wires and the curves of the products were characterized using metallographic analysis, microhardness Vickers tests, X-ray diffraction (XRD), X-Ray Refraction (XRF) and tensile tests. After the experiments were analyzed some parameters that have been measurable, it demonstrates to the impracticality of this proposed method, since the friction force and the concept of alternating request at the contact between the strands of wire and the inner curves that are part ducts caused severe wear. These types of wear are likely to cause possible failures in future products and cause fluid leaks

Essa ciranda não é minha só, é de todas nós: um estudo sobre feminismo, autonomia e consciência coletiva

The notion of autonomy arises in feminism as theory and action for horizontal and building self-appointed women in the project of social transformation. As part of the feminist movement - political subject of women - the autonomy is established dynamically, back and forth from the socio-historical context that sign and thus the correlation of forces that is with the women's group . Thus, for this work it was necessary to feminism take on your current process, which set the transitional period of "onguização" of feminist organizations (1980 to 2000), which discusses the relative loss of autonomy before the alliance as State and dependence on development agencies, for the current period, which incorporates discourses and practices through autonomous groups and their militants. Therefore, this study is based on research of autonomous feminism of young women, characterized as another radical and political integration proposed for that period. The aim then was to analyze the organizational capacity of autonomous feminist collective in Natal/RN, from the knowledge of the structure and dynamics of a group and understanding the consubstantiality gender, 'race'/ethnicity, class for the process organization. And with the participation of the Coletivo Autônomo Feminista Leila Diniz. This was in organizational transition, ending his career as ONGs and leaving for autonomous militancy. In order to achieve the so-objectification proposal, literature review was performed of the categories, feminism, autonomy, patriarchy, feminist activist conscientiously and collective; documentary research relating to the Group; participant observations within their meetings; and a themed workshop with some militants Autonomous Collective, which was produced pictures and speeches. The materialization of these instruments provided research analysis on the elements that constitute the young feminists and contemporary autonomous organizations, in view of the multiple experiences and the diversity of women who configures the subject [the subject] while feminist collective total. As well as taking a feminist militancy conscience expressed by the group studied the necessary re-appropriation of each other in combating patriarchal femininity, the hierarchical naturalizations marking the sex of women and the recognition as sex class for feminist autonomous organization for women's liberation.

Análise crítica dos produtos de mobilidade sentada - cadeiras de rodas - utilizados por crianças e adolescentes com paralisia cerebral em Natal/RN e outros municípios do Rio Grande do Norte

The objective of this work is to critically analyze the seated mobility adaptive equipment, wheelchair, used by non-ambulatory children/adolescents diagnosed with cerebral palsy of the quadriplegy type with ages in between 0-18 years old in the municipal city of Natal/RN and of other ones in the state of Rio Grande do Norte. This study is characterized as descriptive as it took into consideration the individualized conditions of each child/adolescent and of their home environment, and also evaluates the condition of the used seated mobility devices such as wheelchairs or strollers. Thirty three (33) subjects which had a wheelchair prescribed by a healthcare professional specialist in adaptive equipment within the past 3 years were selected. A questionnaire was applied through a phone with the patient s primary care giver or parents. The results obtained showed that all the equipment being used had an anatomical seat and back and the tilt system mechanism and even though most of the patients required small individual adjustments upon receiving the wheelchair in order to accommodate to the patients characteristics. From the point of view of the caregiver/parents interviewed, 97% described satisfied with the equipment and report assistance with mobility (97%), comfort (82%) and good posture (82%) as the main positive aspects from the equipment. The results also describe the aspects related to the maintenance, time used and activities developed that were reported by the patients. The conclusion therefore is that in order to select the equipment to meet the needs of the consumer it is necessary that: an appropriate wheelchair prescription takes place, the up-to-date knowledge of equipment available in the market, the appropriate use of the resources from the concession programs of the government that purchase equipment and the establishment of link in between the manufacturers, patients and the caregivers