5 research outputs found

    Experimental research of vibration and noise of rolling cylinder on plane

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    9International audienceThe purpose of this experimental research is to research the noise generated by rolling surfaces. This problem is important in bearings, railroad transport and many technical applications. Experimental research was carried out in such a way that noise and vibration from any technical equipment did not interfere; only ambient vibration and noise influenced measurements. Tests were performed using specific processes, which are described in this paper. The parameters of vibrations on a steady plane and noise in the surroundings of a rolling cylinder were registered. For this purpose three series of tests with various surfaces and roughness parameters were performed. It was experimentally proved that dry and lubricated surfaces generate different noise sound frequencies. Some interesting connections between generated vibrations and sound were also found. The proposed technique can be applied to bearing noise evaluation, especially when special materials are used. Research offers useful results, which can be used to estimate noise in newly designed devices. Finally, conclusions on results are made

    Experimental research of vibration and noise of rolling cylinder on plane

    No full text
    9International audienceThe purpose of this experimental research is to research the noise generated by rolling surfaces. This problem is important in bearings, railroad transport and many technical applications. Experimental research was carried out in such a way that noise and vibration from any technical equipment did not interfere; only ambient vibration and noise influenced measurements. Tests were performed using specific processes, which are described in this paper. The parameters of vibrations on a steady plane and noise in the surroundings of a rolling cylinder were registered. For this purpose three series of tests with various surfaces and roughness parameters were performed. It was experimentally proved that dry and lubricated surfaces generate different noise sound frequencies. Some interesting connections between generated vibrations and sound were also found. The proposed technique can be applied to bearing noise evaluation, especially when special materials are used. Research offers useful results, which can be used to estimate noise in newly designed devices. Finally, conclusions on results are made

    Global economic burden of unmet surgical need for appendicitis

    No full text
    Background There is a substantial gap in provision of adequate surgical care in many low- and middle-income countries. This study aimed to identify the economic burden of unmet surgical need for the common condition of appendicitis. Methods Data on the incidence of appendicitis from 170 countries and two different approaches were used to estimate numbers of patients who do not receive surgery: as a fixed proportion of the total unmet surgical need per country (approach 1); and based on country income status (approach 2). Indirect costs with current levels of access and local quality, and those if quality were at the standards of high-income countries, were estimated. A human capital approach was applied, focusing on the economic burden resulting from premature death and absenteeism. Results Excess mortality was 4185 per 100 000 cases of appendicitis using approach 1 and 3448 per 100 000 using approach 2. The economic burden of continuing current levels of access and local quality was US 92492millionusingapproach1and92 492 million using approach 1 and 73 141 million using approach 2. The economic burden of not providing surgical care to the standards of high-income countries was 95004millionusingapproach1and95 004 million using approach 1 and 75 666 million using approach 2. The largest share of these costs resulted from premature death (97.7 per cent) and lack of access (97.0 per cent) in contrast to lack of quality. Conclusion For a comparatively non-complex emergency condition such as appendicitis, increasing access to care should be prioritized. Although improving quality of care should not be neglected, increasing provision of care at current standards could reduce societal costs substantially

    Global economic burden of unmet surgical need for appendicitis

    No full text
    Background There is a substantial gap in provision of adequate surgical care in many low- and middle-income countries. This study aimed to identify the economic burden of unmet surgical need for the common condition of appendicitis. Methods Data on the incidence of appendicitis from 170 countries and two different approaches were used to estimate numbers of patients who do not receive surgery: as a fixed proportion of the total unmet surgical need per country (approach 1); and based on country income status (approach 2). Indirect costs with current levels of access and local quality, and those if quality were at the standards of high-income countries, were estimated. A human capital approach was applied, focusing on the economic burden resulting from premature death and absenteeism. Results Excess mortality was 4185 per 100 000 cases of appendicitis using approach 1 and 3448 per 100 000 using approach 2. The economic burden of continuing current levels of access and local quality was US 92492millionusingapproach1and92 492 million using approach 1 and 73 141 million using approach 2. The economic burden of not providing surgical care to the standards of high-income countries was 95004millionusingapproach1and95 004 million using approach 1 and 75 666 million using approach 2. The largest share of these costs resulted from premature death (97.7 per cent) and lack of access (97.0 per cent) in contrast to lack of quality. Conclusion For a comparatively non-complex emergency condition such as appendicitis, increasing access to care should be prioritized. Although improving quality of care should not be neglected, increasing provision of care at current standards could reduce societal costs substantially
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