In the present work thermally stimulated luminescence from synthetic hydroxyapatite (SHA) under gamma, high energy electron beam (HEEB) and neutron (n) source were reported. The synthesis of SHA was carried out using the sol-gel method. Thermoluminescent (TL) glow curves of SHA powders were obtained by irradiation with Co-60 gamma radiation sources, high-energy electron beam and neutron-emitting source. The TL curve of HAS under the effect of gamma irradiation exhibited a TL glow curve with two well-defined peaks. The first one is located around 150 °C and the second one is located at 240 °C respectively. When irradiated with a high-energy electron beam, a peak centered at around 250 °C was observed. Meanwhile, when the samples were exposed to a neutron-emitting source, a prominent peak centered at 195 °C and two shoulders located at 245° and 290 °C respectively were observed. Other TL characteristics of SHA under gamma radiation effect were analyzed. Experimental results of SHA under three different ionizing radiation shows three different TL glow curves as well as other TL characteristics show also that SHA can be considered as potential candidate as radiation dosimeter in a retrospective dosimetry.

2025-03-04·Physiotherapy Theory and Practice

The effect of chronic low back pain and lumbopelvic stabilization instructions on gluteus medius activation during sidelying hip movements

Article

作者: Singhal, Kunal ; Meekins, Myra M. ; Kasser, Richard ; Zucker-Levin, Audrey ; Huffman, Kyle ; Harris-Hayes, Marcie

BACKGROUNDPeople with chronic low back pain (LBP) often demonstrate altered muscle activation with movements that involve the lumbopelvic region and hips.OBJECTIVEThe purpose of this study was to compare gluteus medius activity during sidelying hip abduction (SHA) and sidelying hip abduction-lateral rotation (SHALR) with and without instruction for lumbopelvic stabilization in people with and without chronic LBP.METHODSA cross-sectional study was conducted recruiting participants with (n = 17) and without (n = 17) chronic LBP. Gluteus medius activity was recorded with surface electromyography during the performance of SHA and SHALR with and without instructions including the abdominal drawing-in maneuver for lumbopelvic stabilization.RESULTSFor SHA and SHALR, there was a significant main effect for instruction for stabilization indicated by a decrease in gluteus medius activity with instructions (p = .001, p < .001). There was not a significant main effect of chronic LBP on gluteus medius activity between groups for either activity. There was no significant interaction effect of pain and instruction for stabilization with SHA or SHALR.CONCLUSIONKnowledge of changes in gluteus medius muscle activation patterns with trunk stabilization instruction may help clinicians with assessment of exercise performance to optimize gluteus medius activation.

2025-03-01·Journal of Environmental Management

Depicting, spatializing, and decoupling the impact of human activities on soil erosion in the hilly red soil region of southern China from the perspective of soil erosion influence factors

Article

作者: Lang, Yanqing ; Cai, Hongyan ; Yang, Xiaohuan

Human activities are the primary cause of increasing soil erosion worldwide. A comparative analysis of different human activity types on soil erosion can provide detailed insights into their respective roles. This study focused on Jiangxi Province, a typical red soil hilly region, to assess the impact of human activities on soil erosion based on natural influencing factors. Human activities were classified into vegetation-based human activities (VHA), soil-based human activities (SHA), and terrain-based human activities (THA). We proposed a combined impact index and a decoupling method to calculate the separate impact index for each type. The results revealed that from 2000 to 2020: (1) VHA was the dominant type, covering about 65% of the study area, followed by SHA (20%) and THA (3%). (2) The deteriorating effects of SHA were about two times greater than those of VHA, while the alleviating effect of THA was much smaller than both deteriorating effects. This study offers a new perspective for understanding the effects of human activities on soil erosion by comparing the impacts of different types of human activities.

100 项与 Sulfated hyaluronic acid 相关的药物交易

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