Realizing campus sustainability requires the environmental-friendly and economical treatment of tremendous fallen leaves.Producing fallen leaf biochar at a low temperature is a candidate approach.In this study,six com...Realizing campus sustainability requires the environmental-friendly and economical treatment of tremendous fallen leaves.Producing fallen leaf biochar at a low temperature is a candidate approach.In this study,six common types of fallen leaves on the campus were pyrolyzed at 300℃.The obtained biochars were characterized and the adsorption mechanisms of lead(Pb)by the fallen leaf biochars were investigated.The adsorption capacity of leaf biochar for Pb was relatively high,up to 209 mg/g(Yulania denudata leaf biochar).Adsorption of Pb onto active sites was the rate-limiting step for most leaf biochars.But for Platanus leaf biochar,intraparticle diffusion of Pb^(2+)dominated owing to the lowest adsorption capacity.However,the highest exchangeable Pb fraction(27%)indicated its potential for removing aqueous Pb^(2+).Ginkgo and Prunus cerasifera leaf biochar immobilized Pb by surface complexation and precipitation as lead oxalate.Hence,they were suitable for soil heavy metal remediation.This study shed the light on the sustainable utilization of campus fallen leaves and the application of fallen leaf biochars in heavy metal remediation.展开更多
Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highl...Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highly depends on the security level of vehicular communication systems （VCS）. Security applications in VCS are fulfilled through secured group broadcast. Therefore, secure key management schemes are considered as a critical research topic for network security. In this paper, we propose a framework for providing secure key management within heterogeneous network. The seeurity managers （SMs） play a key role in the framework by retrieving the vehicle departnre infi^rmation, encapsulating block to transport keys and then executing rekeying to vehicles within the same security domain. The first part of this framework is a novel Group Key Management （GKM） scheme basing on leaving probability （LP） of vehicles to depart current VCS region. Vehicle＇s LP factor is introduced into GKM scheme to achieve a more effieient rekeying scheme and less rekeying costs. The second component of the framework using the blockchain concept to simplify the distributed key management in heterogeneous VCS domains. Extensive simulations and analysis are provided to show the effectiveness and effieiency of the proposed framework： Our GKM results demonstrate that probability-based BR reduees rekeying eost compared to the benchmark scheme, while the blockchain deereases the time eost of key transmission over heterogeneous net-works.展开更多
Nursing turnover and shortage are acknowledged as worldwide issues: understanding the factors that foster nurses’ intention to leave (ITL) is essential in retaining them. The present study aims at providing insight i...Nursing turnover and shortage are acknowledged as worldwide issues: understanding the factors that foster nurses’ intention to leave (ITL) is essential in retaining them. The present study aims at providing insight into the factors influencing critical care and intensive care nurses’ ITL the unit, the hospital, and the nursing profession. The study was conducted in two hospitals, by a questionnaire administered to all nurses employed in critical and intensive care units. 512 questionnaires (89.4%) were returned. Results revealed that a low job satisfaction (JS) for interaction with physicians and nurses, seniority ≥20 years, and working in Emergency are related to higher ITL the unit. Low JS for work organization policies, seniority ≥11 years, working in a private hospital, and higher educational level are related to higher levels of ITL the hospital. Low JS for professional status, for pay, and for work organization policies, age ≥40 years, part-time schedule are related to higher ITL the nursing profession. The research permitted detection of various predictors of different kinds of ITL, enhancing the importance of regular monitoring of ITL. In order to limit ITL, it would be important to work on the relationship with physicians and colleagues, work demands, organizational policies, and acknowledgement of competence.展开更多
Background: Inadequate human resources are a major constraint to improving global health. The health sector is characterized by a high turnover coupled with internal as well as external brain drain but there is little...Background: Inadequate human resources are a major constraint to improving global health. The health sector is characterized by a high turnover coupled with internal as well as external brain drain but there is little information on intention to leave among health professionals in public health centers of Jimma Zone, Oromia Regional State. The aim of this study is to assess intention to leave and associated factors among health professionals in public health centers of Jimma Zone, southwest Ethiopia. Methods: A cross-sectional quantitative and qualitative study was conducted on seven randomly selected woredas (districts) which have 53 public health centers. All health professionals in sampled district public health centers were included (n = 505). Factor analysis was employed for all Likert scale instruments to extract factor(s) representing each of the scales using SPSS version 16.0. The qualitative data was analyzed by thematic analysis methods. Ethical approval was obtained from Jimma University. Results: Four hundred fifty five (90.1%) health professionals participated in the study;out of this, 290 (63.7%) had intention to leave. Among variables, job satisfaction (Beta = -0.298, (95% CI, -0.568 to -0.029), working environment (Beta = -0.612, (95% CI, -0.955 to -0.270), and organizational management (Beta = -0.552, (95% CI, 0.289 to 0.815) had statistically significant association with intention to leave among health professionals in public health centers of Jimma Zone. Conclusions: The overall intention to leave among health professionals was high. Level of job satisfaction, working environment, work pressure, and organizational management had statistically significant association with intention to leave. Thus, responsible bodies should aggressively work on the concerns identified, like, improvements in salary, promotion in terms of training/educational opportunity, improving working environment, and transfer of health professionals, and improvement of the leadership skills of managers.展开更多
Under the direction of Sustainable Development, some key issues of forestry in Western Liaoning Province were analyzed in this paper. "Planting Broad-leaved Trees and Accelerating Conifers" (PBTAC) was put f...Under the direction of Sustainable Development, some key issues of forestry in Western Liaoning Province were analyzed in this paper. "Planting Broad-leaved Trees and Accelerating Conifers" (PBTAC) was put forward as the effective approach to sustainable management on the Pure Plantation of Pinus tabulaeformis and the unique path of forestry sustainable development in Western Liaoning Province. The concept, aim, and notices of "PBTAC" were also analyzed and discussed.展开更多
基金supported by the National Natural Science Foundation of China(No.42277123)Natural Science Foundation of Jiangsu Province(No.BK20220787)。
文摘Realizing campus sustainability requires the environmental-friendly and economical treatment of tremendous fallen leaves.Producing fallen leaf biochar at a low temperature is a candidate approach.In this study,six common types of fallen leaves on the campus were pyrolyzed at 300℃.The obtained biochars were characterized and the adsorption mechanisms of lead(Pb)by the fallen leaf biochars were investigated.The adsorption capacity of leaf biochar for Pb was relatively high,up to 209 mg/g(Yulania denudata leaf biochar).Adsorption of Pb onto active sites was the rate-limiting step for most leaf biochars.But for Platanus leaf biochar,intraparticle diffusion of Pb^(2+)dominated owing to the lowest adsorption capacity.However,the highest exchangeable Pb fraction(27%)indicated its potential for removing aqueous Pb^(2+).Ginkgo and Prunus cerasifera leaf biochar immobilized Pb by surface complexation and precipitation as lead oxalate.Hence,they were suitable for soil heavy metal remediation.This study shed the light on the sustainable utilization of campus fallen leaves and the application of fallen leaf biochars in heavy metal remediation.
文摘Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highly depends on the security level of vehicular communication systems （VCS）. Security applications in VCS are fulfilled through secured group broadcast. Therefore, secure key management schemes are considered as a critical research topic for network security. In this paper, we propose a framework for providing secure key management within heterogeneous network. The seeurity managers （SMs） play a key role in the framework by retrieving the vehicle departnre infi^rmation, encapsulating block to transport keys and then executing rekeying to vehicles within the same security domain. The first part of this framework is a novel Group Key Management （GKM） scheme basing on leaving probability （LP） of vehicles to depart current VCS region. Vehicle＇s LP factor is introduced into GKM scheme to achieve a more effieient rekeying scheme and less rekeying costs. The second component of the framework using the blockchain concept to simplify the distributed key management in heterogeneous VCS domains. Extensive simulations and analysis are provided to show the effectiveness and effieiency of the proposed framework： Our GKM results demonstrate that probability-based BR reduees rekeying eost compared to the benchmark scheme, while the blockchain deereases the time eost of key transmission over heterogeneous net-works.
文摘Nursing turnover and shortage are acknowledged as worldwide issues: understanding the factors that foster nurses’ intention to leave (ITL) is essential in retaining them. The present study aims at providing insight into the factors influencing critical care and intensive care nurses’ ITL the unit, the hospital, and the nursing profession. The study was conducted in two hospitals, by a questionnaire administered to all nurses employed in critical and intensive care units. 512 questionnaires (89.4%) were returned. Results revealed that a low job satisfaction (JS) for interaction with physicians and nurses, seniority ≥20 years, and working in Emergency are related to higher ITL the unit. Low JS for work organization policies, seniority ≥11 years, working in a private hospital, and higher educational level are related to higher levels of ITL the hospital. Low JS for professional status, for pay, and for work organization policies, age ≥40 years, part-time schedule are related to higher ITL the nursing profession. The research permitted detection of various predictors of different kinds of ITL, enhancing the importance of regular monitoring of ITL. In order to limit ITL, it would be important to work on the relationship with physicians and colleagues, work demands, organizational policies, and acknowledgement of competence.
文摘Background: Inadequate human resources are a major constraint to improving global health. The health sector is characterized by a high turnover coupled with internal as well as external brain drain but there is little information on intention to leave among health professionals in public health centers of Jimma Zone, Oromia Regional State. The aim of this study is to assess intention to leave and associated factors among health professionals in public health centers of Jimma Zone, southwest Ethiopia. Methods: A cross-sectional quantitative and qualitative study was conducted on seven randomly selected woredas (districts) which have 53 public health centers. All health professionals in sampled district public health centers were included (n = 505). Factor analysis was employed for all Likert scale instruments to extract factor(s) representing each of the scales using SPSS version 16.0. The qualitative data was analyzed by thematic analysis methods. Ethical approval was obtained from Jimma University. Results: Four hundred fifty five (90.1%) health professionals participated in the study;out of this, 290 (63.7%) had intention to leave. Among variables, job satisfaction (Beta = -0.298, (95% CI, -0.568 to -0.029), working environment (Beta = -0.612, (95% CI, -0.955 to -0.270), and organizational management (Beta = -0.552, (95% CI, 0.289 to 0.815) had statistically significant association with intention to leave among health professionals in public health centers of Jimma Zone. Conclusions: The overall intention to leave among health professionals was high. Level of job satisfaction, working environment, work pressure, and organizational management had statistically significant association with intention to leave. Thus, responsible bodies should aggressively work on the concerns identified, like, improvements in salary, promotion in terms of training/educational opportunity, improving working environment, and transfer of health professionals, and improvement of the leadership skills of managers.
文摘Under the direction of Sustainable Development, some key issues of forestry in Western Liaoning Province were analyzed in this paper. "Planting Broad-leaved Trees and Accelerating Conifers" (PBTAC) was put forward as the effective approach to sustainable management on the Pure Plantation of Pinus tabulaeformis and the unique path of forestry sustainable development in Western Liaoning Province. The concept, aim, and notices of "PBTAC" were also analyzed and discussed.
