Generation Of Efforts Research Articles

Analysis of the Manual Lifting of Loads in Operators: Evaluation of Efforts

This article presents the results of the evaluations of the mechanical stresses associated with the performance of manual lifting tasks of loads and those operators must endure in their workplaces, considering these the most recurrent cases and positions. This study is based on a static analysis of certainspecific positions of the human body, the transmission of forces through the musculoskeletal structure, and the generation of efforts at critical points of the body. In addition to this, it is considered a revision of the criteria of the Spanish Technical Standard NTP-477. There are critical points of the musculoskeletal structure that support considerable efforts, the recommendations and criteria provided by the NTP-477 are relevant and although limited, provide an adequate margin of safety to avoid injury to workers.

The Effects of GO Centers on Creating a College Culture in Urban High Schools in Texas

Despite a generation of efforts to make higher education an achievable goal for all students, the gap in college participation rates between low-income and high-income students has not narrowed. Moreover, students of color continue to be underrepresented on postsecondary campuses. Early intervention efforts and college outreach programs such as college access centers have been identified as exemplary strategies for encouraging a college-going culture in high schools and in decreasing the gap among racial/ ethnic groups who have access to college. This study examined the effectiveness of enhanced college access centers known as GO Centers in assisting students during their preparation and application for college and in providing activities conducive to the development of a college-going culture in eight comprehensive high schools located in a large urban school district. Findings indicate that the enhanced GO Centers demonstrate four aspects identified as important in encouraging a college-going culture in a high school: The centers (a) are inclusive and accessible to all students; (b) demonstrate an understanding of how students develop aspirations and plans to attend college; (c) offer comprehensive services to students and their families, including guidance in preparing for college, applying for college, and accessing financial aid; and (d) employ a systematic approach involving stakeholders.

Activation of the Shoulder Belt and Shoulder Muscles of Humans Related to Different Rates of Generation of Two-Joint Efforts by the Forearm

We studied coordination of central motor commands (CMCs) coming to the muscles that flex and extend the shoulder and elbow joints in the course of generation of voluntary isometric efforts of different directions by the forearm. Dependences of the characteristics of these commands on the direction of the effort and rate of its generation were analyzed. Amplitudes of rectified and averaged EMGs recorded from a number of shoulder belt and shoulder muscles were considered correlates of the CMC intensity. The development of the effort of a given direction and rate of rise was realized in the horizontal-plane operational space; the arm position corresponded to the 30 deg angle in the shoulder joint (external angle with respect to the frontal plane) and 90 deg angle in the elbow joint. We plotted sector diagrams of the relative changes in the level of dynamic and stationary phases of EMG activity of the studied muscles for the entire set of directions of the efforts generated with different rates of rise. In the course of formation of rapid two-joint isometric efforts, realization of nonsynergic motor tasks (extension of one joint and flexion of another one, and vice versa) required significant activation of muscles of different functional directions for both joints. Time organization of EMG activity of extensors and flexors of the shoulder and elbow joints related to the maximum and relatively rapid generation of the effort (rise time 0.12 to 0.13 and 0.25 sec, respectively) was rather complex and included dynamic and stationary phases. With these time parameters of generation of the efforts (both flexion and extension), the appearance at the stationary effort of 40 N was controlled based on coordinated interaction of dynamic phases of the activation of agonistic and antagonistic muscles. It is concluded that CMCs coming to extensors and flexors of both joints upon generation of rapid isometric efforts are rather similar in their parameters to those under conditions of realization of the forearm movements in the space in an isotonic mode.

Interventions and Patterns of Risk in Adolescent HIV/AIDS Prevention

Mid-way through the third decade of experience in preventing HIV/AIDS among adolescents, behavioral interventions and outcomes for high risk subgroups have generated evidence extremely instructive for navigating future priorities in reducing transmission risk behavior. Youth who abuse alcohol or drugs, who are detained or incarcerated, or have mental health co-morbidity such as externalizing disorders, represent the most significant challenge to current and future efforts to control the epidemic among the adolescent population. Although there is no unambiguous, standard intervention approach with adolescents, patterns of risks and outcomes with these subgroups are instructive in the critical priority of creating more sustainable gains with our HIV prevention resources. This article provides a synthesis of the evidence with these subgroups, discusses important limitations and difficulties in the current intervention science and highlights promising directions for the next generation of effort in reducing adolescent HIV-related sexual risk behavior. Because individual-level interventions have had only modest effects, a key current emphasis within the field is to develop multilevel interventions with a more ecological or contextual focus. We review various pragmatic responses that acknowledge this priority and the debt owed to individual-level intervention work with adolescents.

The prestige of professional Czech soldiers in the eyes of the general public

For a variety of historical and contemporary reasons, Czech public support of their own military has been lukewarm at best and hostile at worse. Hodný thoroughly documents these attitudes and explains why they are so. While doing so, he underscores the dilemmas faced by the Czech political and military leaders as they move the nation towards entry into NATO. He concludes that only thorough military reform and genuine military professionalization in terms of education and training will offer any escape from current dilemmas, and then only after a generation of effort and change.

African policy linking education and development: Standard criticisms and a new departure

Two generations of effort (from the 1920s to the 1960s) by pioneer African nationalists to use schools as the chief catalyst for national development strategy was followed by a generation of scholarship (from the 1960s to the 1980s) that was massively sceptical of their assumptions linking education, causally and positively, to development. The pioneers' writings and experiments, especially in southern Nigeria, are recounted in this paper's first section. The second section surveys the critical literature which experience, on the whole, justifies. The third and concluding section identifies a tangent of analysis which, it is argued, shifts the ground of the debate and supports more hopeful prospects for the current African generation's effort to link education and development productively. Evidence and comment are drawn principally from Anglophone West Africa, but there are inferences clearly to be drawn for general circumstances south of the Sahara.