High levels of distress and disturbance amongst those experiencing acute mental illness can be a major problem for mental health nurses. The feelings experienced by these nurses when caring for and supporting disturbe...High levels of distress and disturbance amongst those experiencing acute mental illness can be a major problem for mental health nurses. The feelings experienced by these nurses when caring for and supporting disturbed and/or distressed patients along with their concurrent thoughts are not well described in the literature. To date, this complex issue has not been explored within a comparative European context. The objective of this qualitative study was to explore the feelings and thoughts of mental health nurses when supporting and caring for distressed and/or disturbed patients in 6 European countries. Methods: Focus groups were used to collect data from 130 mental health nurses working in acute inpatient psychiatric settings. Results: Data were analysed using content analysis. Findings highlighted 6 broad themes: 1) Mixed emotions: expressive and responsive, 2) Procedure for caring for and supporting disturbed and/or distressed patients, 3) Use of guidelines for caring and supporting disturbed and/or distressed patients, 4) Team and organisational support, 5) Ethical concerns: Cognitive dissonance and 6) Education and training. Commonalities and differences were?found across all themes. Approaches to care, nurses’ role and education, clinical guidelines and/or standards vary from country to country, therefore the care, treatment and management of distressed and/or disturbed patients are various. As a result, mental health nurses have different experiences, various emotional quandaries concurrent with cognitive dissonance and different coping strategies when caring for and supporting distressed and disturbed patients. Conclusions: More emphasis needs to be given to the emotional quandaries and concurrent cognitive dissonance experienced by mental health nurses caring for distressed and/or disturbed inpatients in acute psychiatric settings. Increased access to education and training with particular attention to interpersonal communication and relationship building within clinical teams needs to be a priority given the experiences described by mental health nurses.展开更多
In this study, an empirical model was developed to simulate the setting process of cement pastes, with and without limestone. Interestingly, an excellent linear correlation was found between the time required for the ...In this study, an empirical model was developed to simulate the setting process of cement pastes, with and without limestone. Interestingly, an excellent linear correlation was found between the time required for the cement pastes to reach penetration depths of 0 mm to 40 mm (the setting process) and the physical properties of the powders comprising those pastes. The empirical model was based on this clear, linear behavior, determined by means of linear regression analysis. The developed model offers an easy way to predict and to control the setting history of any cement paste, with and without limestone additive, by simply using the available, measured physical properties of the blended cements with limestone particles of various sizes.展开更多
This study extended blending proportion range of ordinary Portland cement(OPC)and calcium sulfoaluminate(CSA)cement blends,and investigated effects of proportions on setting time,workability,and strength development o...This study extended blending proportion range of ordinary Portland cement(OPC)and calcium sulfoaluminate(CSA)cement blends,and investigated effects of proportions on setting time,workability,and strength development of OPC-CSA blend-based mixtures.Thermogravimetric analysis(TGA)and X-ray diffraction(XRD)were conducted to help understand the performance of OPC-CSA blend-based mixtures.The setting time of the OPC-CSA blends was extended,and the workability was improved with increase of OPC content.Although the early-age strength decreased with increase of OPC content,the strength development was still very fast when the OPC content was lower than 60%due to the rapid formation and accumulation of ettringite.At 2 h,the OPC-CSA blend-based mortars with OPC contents of 0%,20%,40%,and 60%achieved the unconfined compressive strength(UCS)of 17.5,13.9,9.6,and 5.0 MPa,respectively.The OPC content had a negligible influence on long-term strength.At 90 d,the average UCS of the OPC-CSA blend-based mortars was 39.2±1.7 MPa.展开更多
主要研究了扩展有限元法(extended finite element method,XFEM)在处理弱不连续问题时不同改进函数形式对XFEM数值求解精度的影响,阐述了各种改进函数影响XFEM求解精度的关键因素,指出校正的扩展有限元法(corrected-XFEM)能够提高数值...主要研究了扩展有限元法(extended finite element method,XFEM)在处理弱不连续问题时不同改进函数形式对XFEM数值求解精度的影响,阐述了各种改进函数影响XFEM求解精度的关键因素,指出校正的扩展有限元法(corrected-XFEM)能够提高数值求解精度的实质在于它拓展了改进结点域,即将常规扩展有限元法(standard-XFEM)的改进结点域增加一层作为corrected-XFEM的改进结点域,文中建议延拓corrected-XFEM的改进结点域,即在corrected-XFEM的改进结点域基础上再增加一层改进结点.利用水平集函数表征材料内部的不连续界面,推导了XFEM求解的支配方程,给出了一种改进单元的数值积分方案以及改进单元处高精度应力的求解方法.含夹杂问题的数值计算结果表明:建议的延拓corrected-XFEM改进结点域的方法能够明显提高XFEM的数值求解精度.展开更多
文摘High levels of distress and disturbance amongst those experiencing acute mental illness can be a major problem for mental health nurses. The feelings experienced by these nurses when caring for and supporting disturbed and/or distressed patients along with their concurrent thoughts are not well described in the literature. To date, this complex issue has not been explored within a comparative European context. The objective of this qualitative study was to explore the feelings and thoughts of mental health nurses when supporting and caring for distressed and/or disturbed patients in 6 European countries. Methods: Focus groups were used to collect data from 130 mental health nurses working in acute inpatient psychiatric settings. Results: Data were analysed using content analysis. Findings highlighted 6 broad themes: 1) Mixed emotions: expressive and responsive, 2) Procedure for caring for and supporting disturbed and/or distressed patients, 3) Use of guidelines for caring and supporting disturbed and/or distressed patients, 4) Team and organisational support, 5) Ethical concerns: Cognitive dissonance and 6) Education and training. Commonalities and differences were?found across all themes. Approaches to care, nurses’ role and education, clinical guidelines and/or standards vary from country to country, therefore the care, treatment and management of distressed and/or disturbed patients are various. As a result, mental health nurses have different experiences, various emotional quandaries concurrent with cognitive dissonance and different coping strategies when caring for and supporting distressed and disturbed patients. Conclusions: More emphasis needs to be given to the emotional quandaries and concurrent cognitive dissonance experienced by mental health nurses caring for distressed and/or disturbed inpatients in acute psychiatric settings. Increased access to education and training with particular attention to interpersonal communication and relationship building within clinical teams needs to be a priority given the experiences described by mental health nurses.
文摘In this study, an empirical model was developed to simulate the setting process of cement pastes, with and without limestone. Interestingly, an excellent linear correlation was found between the time required for the cement pastes to reach penetration depths of 0 mm to 40 mm (the setting process) and the physical properties of the powders comprising those pastes. The empirical model was based on this clear, linear behavior, determined by means of linear regression analysis. The developed model offers an easy way to predict and to control the setting history of any cement paste, with and without limestone additive, by simply using the available, measured physical properties of the blended cements with limestone particles of various sizes.
基金The authors would like to thank the Natural Sciences and Engineering Research Council of Canada for its financial support(NSERC RGPIN-2017-05537)the CTS Cement Manufacturing Corp.,USA,for supplying the CSA cement,and Mr.Rizaldy Mariano for his support in the laboratory work.
文摘This study extended blending proportion range of ordinary Portland cement(OPC)and calcium sulfoaluminate(CSA)cement blends,and investigated effects of proportions on setting time,workability,and strength development of OPC-CSA blend-based mixtures.Thermogravimetric analysis(TGA)and X-ray diffraction(XRD)were conducted to help understand the performance of OPC-CSA blend-based mixtures.The setting time of the OPC-CSA blends was extended,and the workability was improved with increase of OPC content.Although the early-age strength decreased with increase of OPC content,the strength development was still very fast when the OPC content was lower than 60%due to the rapid formation and accumulation of ettringite.At 2 h,the OPC-CSA blend-based mortars with OPC contents of 0%,20%,40%,and 60%achieved the unconfined compressive strength(UCS)of 17.5,13.9,9.6,and 5.0 MPa,respectively.The OPC content had a negligible influence on long-term strength.At 90 d,the average UCS of the OPC-CSA blend-based mortars was 39.2±1.7 MPa.
文摘主要研究了扩展有限元法(extended finite element method,XFEM)在处理弱不连续问题时不同改进函数形式对XFEM数值求解精度的影响,阐述了各种改进函数影响XFEM求解精度的关键因素,指出校正的扩展有限元法(corrected-XFEM)能够提高数值求解精度的实质在于它拓展了改进结点域,即将常规扩展有限元法(standard-XFEM)的改进结点域增加一层作为corrected-XFEM的改进结点域,文中建议延拓corrected-XFEM的改进结点域,即在corrected-XFEM的改进结点域基础上再增加一层改进结点.利用水平集函数表征材料内部的不连续界面,推导了XFEM求解的支配方程,给出了一种改进单元的数值积分方案以及改进单元处高精度应力的求解方法.含夹杂问题的数值计算结果表明:建议的延拓corrected-XFEM改进结点域的方法能够明显提高XFEM的数值求解精度.
