Study of large medical equipment allocation in Xuzhou

Objective: To investigate the allocation and management of large medical equipment (LME) in Xuzhou, Jiangsu Province, China, in order to make the best use of LME to meet the medical needs of local people. Methods: The research collected data from all hospitals that have LME in Xuzhou using questionnaire; 38 (97.4%) hospitals returned the questionnaire. Results: In Xuzhou, there are a total of 71 pieces of LME, each serving 126 600 people in an area of 163 km2. Sixty-two percent of them are allocated in urban areas, with Gini coefficient at 0.52, indicating imbalance and biased allocation of LME. Conclusion: The al- location of LME in Xuzhou is out of control and unfairly allocated.

受偏心拉伸杆件的中性层位置的确定

为了测定偏心拉伸杆件在组合变形下中性层的位置,在材料力学多功能试验台上对试件施加偏心力p,通过应变与力综合测试仪测定偏心拉伸杆件两侧壁电阻应变片的应变ε,代入公式εp=(ε1+ε2)/2,εm=(ε1-ε2)/2和σ=E×ε,σ1,2=p/A±6M/bh2。当轴向拉应力与弯矩产生的压应力相等时,杆件上的应力等于零。通过应力等于零且平行杆件截面形心的直线就是试验所求偏心拉伸杆件在组合变形下中性层的位置。结果表明:满足公式y=h2/12e,既可得出偏心拉伸杆件在组合变形下的中性层的位置。受偏心拉伸杆件的中性层位置与杆件的宽度h的平方、偏心距e的大小有关,与杆件的厚度b和外加载荷P无关。