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2 results

  • Study of microstructure and mechanical property heterogeneity throughout the wall thickness of high strength aluminum alloy thick-wall pipe

  • Gaoyong Lin, Weiyuan Song, Di Feng, Kun Li, Yongping Feng, Jinxia Liu
  • Journal:
    Journal of Materials Research / Volume 34 / Issue 15 / 14 August 2019
    Published online by Cambridge University Press:
    19 July 2019, pp. 2736-2745
    Print publication:
    14 August 2019

  • Differences in pipe wall microstructure at various positions throughout the wall thickness of high strength aluminum alloy thick-wall pipes produced by reverse hot extrusion were investigated. The microstructures of the inner wall (IW), outer wall (OW), and half wall (HW) were compared. Further, heterogeneity in the mechanical properties of the pipe throughout the wall thickness was also investigated. Results revealed that the volume fraction of precipitation was highest at the HW position because of the higher Zn and Mg contents. Further, approximately 26% of grains were recrystallized in the OW position due to the greater strain during extrusion, while the recrystallization fractions of the IW and HW positions were 13% and 21%, respectively. The effects of precipitation strengthening and deformation strengthening contribute to the highest ultimate tensile strength and Vickers hardness of the HW position, and to the higher elongation of the IW and OW positions.

  • Delayed help seeking behavior in dementia care: preliminary findings from the Clinical Pathway for Alzheimer's Disease in China (CPAD) study

  • Mei Zhao, Xiaozhen Lv, Maimaitirexiati Tuerxun, Jincai He, Benyan Luo, Wei Chen, Kai Wang, Ping Gu, Weihong Kuang, Yuying Zhou, Qiumin Qu, Jianhua He, Nan Zhang, Yongping Feng, Yanping Wang, Xin Yu, Huali Wang
  • Journal:
    International Psychogeriatrics / Volume 28 / Issue 2 / February 2016
    Published online by Cambridge University Press:
    03 July 2015, pp. 211-219
  • Background:

    The prevalence and factors associated with delays in help seeking for people with dementia in China are unknown.

    Methods:

    Within 1,010 consecutively registered participants in the Clinical Pathway for Alzheimer's Disease in China (CPAD) study (NCT01779310), 576 persons with dementia (PWDs) and their informants reported the estimated time from symptom onset to first medical visit seeking diagnosis. Univariate analysis of general linear model was used to examine the potential factors associated with the delayed diagnosis seeking.

    Results:

    The median duration from the first noticeable symptom to the first visit seeking diagnosis or treatment was 1.77 years. Individuals with a positive family history of dementia had longer duration (p = 0.05). Compared with other types of dementia, people with vascular dementia (VaD) were referred for diagnosis earliest, and the sequence for such delays was: VaD < Alzheimer's disease (AD) < frontotemporal dementia (FTD) (p < 0.001). Subtypes of dementia (p < 0.001), family history (p = 0.01), and education level (p = 0.03) were associated with the increased delay in help seeking.

    Conclusions:

    In China, seeking diagnosis for PWDs is delayed for approximately 2 years, even in well-established memory clinics. Clinical features, family history, and less education may impede help seeking in dementia care.