The results of some interesting investigation on the piezoresistivity of carbon fiber reinforced cement based composites (CFRC) are presented with the prospect of developing a new nondestructive testing method to asse...The results of some interesting investigation on the piezoresistivity of carbon fiber reinforced cement based composites (CFRC) are presented with the prospect of developing a new nondestructive testing method to assess the integrity of the composite. The addition of short carbon fibers to cement-based mortar or concrete improves the structural performance and at the same time significantly decreases the bulk electrical resistivity. This makes CFRC responsive to the smart behavior by measuring the resistance change with uniaxial pressure. The piezoresistivity of CFRC under different stress was studied, at the same time the damage occurring inner specimens was detected by acoustic emission as well. Test results show that there exists a marking pressure dependence of the conductivity in CFRC, in which the so-called negative pressure coefficient of resistive (NPCR) and positive pressure coefficient of resistive (PPCR) are observed under low and high pressure. Under constant pressures, time-dependent resistivity is an outstanding characteristic for the composites, which is defined as resistance creep. The breakdown and rebuild-up process of conductive network under pressure may be responsible for the pressure dependence of resistivity.展开更多
A superfine slag powder (SP) made from granulated blast furnace slag incorporating activators by using special millingtechnique, was used as supplementary cementitious material in high performance concrete (HPC), repl...A superfine slag powder (SP) made from granulated blast furnace slag incorporating activators by using special millingtechnique, was used as supplementary cementitious material in high performance concrete (HPC), replacing part ofthe mass of normal Portland cement. The effects of the SP on the workability, mechanical and crack self-healingproperties of HPC were studied. The hydration process and microstructure characteristics were investigated by X-raydiffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The crack self-healing capacitywas evaluated by Brazilian test. The test results indicate that the SP has especially supplementary effect on waterreducing and excellent property of better control of slump loss. The concrete flowability increases remarkably withthe increase of SP replacement level in the range of 20% to 50%. The compressive and splitting tensile strengthsof HPC containing SP are higher than the corresponding strength of the control concrete at all ages. The crackself-healing ability is highly dependent on SP content of HPC.展开更多
Objective: to analyze the risk factors of fluid extravasation in elderly patients undergoing intravenous infusion and to formulate targeted nursing measures. Methods: 816 elderly patients undergoing intravenous infusi...Objective: to analyze the risk factors of fluid extravasation in elderly patients undergoing intravenous infusion and to formulate targeted nursing measures. Methods: 816 elderly patients undergoing intravenous infusion were divided into group A (61 cases, with liquid extravasation) and group B (755 cases, without liquid extravasation) based on the occurrence of liquid extravasation. The data of the two groups were collected, and the influencing factors of liquid extravasation were analyzed by nurses and operating reasons (seniority of nurses, succession during infusion, success of one puncture, etc.) and patient reasons (gender, age, disease site, etc.). Results: ① nurses and operating factors: nurses seniority, complete inspection record of venous passage, success of one puncture, infusion health education, puncture site immobilization, drug warming, indwelling time of venous indwelling needle, and intravenous infusion health education were the influencing factors of fluid extravasation (p < 0.05);② Patient factors: age was the influencing factor of fluid extravasation (p < 0.05);③ Logistic multiple regression analysis: Nurses seniority, success of one puncture, health education of intravenous infusion, braking of puncture site and moderate warming of drugs were the protective factors of fluid extravasation, while the retention time of intravenous indwelling needle, patients age and BMI were the risk factors of fluid extravasation (p < 0.05). Conclusion: nurses, operation reasons and patients age will affect the situation of liquid extravasation during intravenous infusion in the elderly. It is necessary to strengthen targeted nursing intervention.展开更多
Objective: to explore and analyze the influence of health education and nursing intervention on the nursing quality of acute infantile enteritis. Methods: from July 2020 to December 2021, 110 cases of acute infantile ...Objective: to explore and analyze the influence of health education and nursing intervention on the nursing quality of acute infantile enteritis. Methods: from July 2020 to December 2021, 110 cases of acute infantile enteritis were selected for clinical study. The children were divided into two groups by random number table method, with 55 children in each group. The control group applied routine guidance nursing intervention, and the observation group applied health education nursing intervention to obtain and compare the nursing effect, disease awareness (enteritis inducement, enteritis manifestation, enteritis treatment, feeding of children, child care, precautions), complication rate (stomach distension, abdominal pain, pus and blood stool), nursing quality (service attitude, disease cognition, psychological adjustment, symptom treatment, life care) between the two groups. Results: the effective rate of nursing in the observation group was higher than that in the control group. After nursing, the disease awareness score of parents in the observation group was higher than that in the control group. The complication rate in the observation group was lower than that in the control group. The five nursing quality scores in the observation group were higher than that in the control group, with statistical significance (P < 0.05). Conclusion: the application of childrens health education and nursing intervention in acute infantile enteritis has significant nursing effect, higher disease awareness, higher nursing quality score, and lower complication rate.展开更多
文摘The results of some interesting investigation on the piezoresistivity of carbon fiber reinforced cement based composites (CFRC) are presented with the prospect of developing a new nondestructive testing method to assess the integrity of the composite. The addition of short carbon fibers to cement-based mortar or concrete improves the structural performance and at the same time significantly decreases the bulk electrical resistivity. This makes CFRC responsive to the smart behavior by measuring the resistance change with uniaxial pressure. The piezoresistivity of CFRC under different stress was studied, at the same time the damage occurring inner specimens was detected by acoustic emission as well. Test results show that there exists a marking pressure dependence of the conductivity in CFRC, in which the so-called negative pressure coefficient of resistive (NPCR) and positive pressure coefficient of resistive (PPCR) are observed under low and high pressure. Under constant pressures, time-dependent resistivity is an outstanding characteristic for the composites, which is defined as resistance creep. The breakdown and rebuild-up process of conductive network under pressure may be responsible for the pressure dependence of resistivity.
基金The research work presented in this paper was conducted with partial support from the Foundation for University Key Teacher by the Ministry of EducationThe first author also gratefully acknowledges the financial support from NSFC (No. 59908007) t
文摘A superfine slag powder (SP) made from granulated blast furnace slag incorporating activators by using special millingtechnique, was used as supplementary cementitious material in high performance concrete (HPC), replacing part ofthe mass of normal Portland cement. The effects of the SP on the workability, mechanical and crack self-healingproperties of HPC were studied. The hydration process and microstructure characteristics were investigated by X-raydiffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The crack self-healing capacitywas evaluated by Brazilian test. The test results indicate that the SP has especially supplementary effect on waterreducing and excellent property of better control of slump loss. The concrete flowability increases remarkably withthe increase of SP replacement level in the range of 20% to 50%. The compressive and splitting tensile strengthsof HPC containing SP are higher than the corresponding strength of the control concrete at all ages. The crackself-healing ability is highly dependent on SP content of HPC.
文摘Objective: to analyze the risk factors of fluid extravasation in elderly patients undergoing intravenous infusion and to formulate targeted nursing measures. Methods: 816 elderly patients undergoing intravenous infusion were divided into group A (61 cases, with liquid extravasation) and group B (755 cases, without liquid extravasation) based on the occurrence of liquid extravasation. The data of the two groups were collected, and the influencing factors of liquid extravasation were analyzed by nurses and operating reasons (seniority of nurses, succession during infusion, success of one puncture, etc.) and patient reasons (gender, age, disease site, etc.). Results: ① nurses and operating factors: nurses seniority, complete inspection record of venous passage, success of one puncture, infusion health education, puncture site immobilization, drug warming, indwelling time of venous indwelling needle, and intravenous infusion health education were the influencing factors of fluid extravasation (p < 0.05);② Patient factors: age was the influencing factor of fluid extravasation (p < 0.05);③ Logistic multiple regression analysis: Nurses seniority, success of one puncture, health education of intravenous infusion, braking of puncture site and moderate warming of drugs were the protective factors of fluid extravasation, while the retention time of intravenous indwelling needle, patients age and BMI were the risk factors of fluid extravasation (p < 0.05). Conclusion: nurses, operation reasons and patients age will affect the situation of liquid extravasation during intravenous infusion in the elderly. It is necessary to strengthen targeted nursing intervention.
文摘Objective: to explore and analyze the influence of health education and nursing intervention on the nursing quality of acute infantile enteritis. Methods: from July 2020 to December 2021, 110 cases of acute infantile enteritis were selected for clinical study. The children were divided into two groups by random number table method, with 55 children in each group. The control group applied routine guidance nursing intervention, and the observation group applied health education nursing intervention to obtain and compare the nursing effect, disease awareness (enteritis inducement, enteritis manifestation, enteritis treatment, feeding of children, child care, precautions), complication rate (stomach distension, abdominal pain, pus and blood stool), nursing quality (service attitude, disease cognition, psychological adjustment, symptom treatment, life care) between the two groups. Results: the effective rate of nursing in the observation group was higher than that in the control group. After nursing, the disease awareness score of parents in the observation group was higher than that in the control group. The complication rate in the observation group was lower than that in the control group. The five nursing quality scores in the observation group were higher than that in the control group, with statistical significance (P < 0.05). Conclusion: the application of childrens health education and nursing intervention in acute infantile enteritis has significant nursing effect, higher disease awareness, higher nursing quality score, and lower complication rate.
