1,095 research outputs found
Supplemental Material - Moral distress, psychological capital, and burnout in registered nurses
No full textSupplemental Material for Moral distress, psychological capital, and burnout in registered nurses by Bowen Xue, Shujin Wang, Dandan Chen, Zhiguo Hu, Yaping Feng and Hong Luo in Nursing Ethics</p
Multi-objective imperfect maintenance for dependent competing risk systems with multiple degradation processes
No full textMultiple competing risks are one of the important topics in reliability field, especially degradation processes and random shocks. This research aims to relax the independent assumption by considering that there exist dependent relationships not only among multiple degradation measures but also between degradation measure and random shocks. In reality, many systems have multiple components with more than one degradation measure which is dependent with each other due to their interplaying functions or common usage history. Independent assumption may underestimate system reliability estimation under many cases. Random shocks will also contribute to the system failure through two ways: (1) one is working directly on the degradation processes; (2) the other is causing immediate failure to the system. We develop a new methodology to formulate the reliability prediction model for the gradually degradating systems subject to multiple dependent competing risks of degradation processes and random shocks. Two kinds of random shocks are considered: (1) fatal shocks, which fail the system immediately; (2) non-fatal shocks, which exhibit two effects on the system degradation process, including sudden degradation increment and degradation rate acceleration. The dependency between degradation processes and random shocks are modulated by a time-scaled covariate factors while the dependency among degradation processes are fitted by copula method. Also the reliability and state probability estimation for the systems are derived under the research scope of multi-state system using both analytical and Monte Carlo simulation for the dependent competing-risk systems. Different maintenance policy models involving imperefect preventive maintenance for this dependent model are introducted and compared with each other. Multi-objective optimization is applied to consider two important targets simultaneously in maintenance issues, including long-run expected cost rate and system availability.Ph. D.Includes bibliographical referencesIncludes vitaby Yaping Wan
Spatiotemporal dynamics of carbon cycling and thermokarst in response to climate and fire-regime changes in the Arctic tundra biome
No full textAmplified climate change and fire regime shifts in the northern high latitudes are posing growing threat to key properties and functions of tundra ecosystems, including soil carbon stock, permafrost stability and vegetation types. However, it remains poorly understood how tundra ecosystems will feedback to the combined forces of changing climate and fire disturbance. In this study, I integrated paleoecology, numerical modeling and remote sensing observation to address (1) the resilience and sensitivity of tundra carbon stocks to shifting fire regimes, (2) the consequences of climate change and fire disturbance on thermokarst disturbance (e.g. collapse of ground surface after permafrost thaw), and (3) the patterns of shrub expansion in heterogenous tundra landscape in response to accelerated warming and fire disturbance. My results indicate that fire disturbance has threshold effects on tundra carbon stocks. Variation in fire return intervals from 5000 to 900 years causes minimal carbon stock loss (<5%). However, increasing fire frequency beyond every 800 years is projected to trigger sustained mobilization of ancient soil organic matter that leads to irreversible carbon stock loss from permafrost. Multi-decade remote sensing observations revealed that tundra fires resulted in pervasive thermokarst formation, and that this impact lasted more than four decades. Nevertheless, substantial spatial heterogeneity exists regarding thermokarst formation and the greatest amount of thermokarst appears in severely burned tundra ecosystems in ice-rich areas. Although fire disturbance is a strong force exacerbating permafrost degradation, widespread warming surpasses sporadic burning as the primary driver responsible for ~90% of thermokarst growth in northern Alaskan tundra over the past ~70 yrs. Permafrost thawing strongly influences shrub cover dynamics in tundra ecosystems, but the net outcome is largely contingent on topographical positions. In poorly drained tundra lowlands, thermokarst-induced water impounding resulted in massive shrub cover loss throughout three decades following fire. In contrast, shrub expansion was significantly enhanced in well-drained upland tundra after fire disturbance, especially in area burned of high severity fire. In unburned tundra, a general increase of shrub cover was detected, driven primarily by warming temperature in the lowland but by increased precipitation in the upland. Overall my research yields new insights into the complex responses of tundra ecosystems to climate and fire-regime changes, and suggests the importance of incorporating such information into earth system models for improving our understanding of land-atmosphere feedback processes.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-08-01The student, Yaping Chen, accepted the attached license on 2020-06-17 at 13:59.The student, Yaping Chen, submitted this Dissertation for approval on 2020-06-17 at 14:01.This Dissertation was approved for publication on 2020-06-24 at 16:07.DSpace SAF Submission Ingestion Package generated from Vireo submission #15453 on 2020-10-02 at 15:49:26Made available in DSpace on 2020-10-07T22:48:07Z (GMT). No. of bitstreams: 3
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Previous issue date: 2020-06-24Embargo set by: Seth Robbins for item 116292
Lift date: 2022-10-07T22:48:14Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 116292
Lift date: 2022-10-07T22:50:13Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimite
Municipal sewage sludge compost promotes Mangifera persiciforma tree growth with no risk of heavy metal contamination of soil
No full textApplication of sewage sludge compost (SSC) as a fertilizer on landscaping provides a potential way for the effective disposal of sludge. However, the response of landscape trees to SSC application and the impacts of heavy metals from SSC on soil are poorly understood. We conducted a pot experiment to investigate the effects of SSC addition on Mangifera persiciforma growth and quantified its uptake of heavy metals from SSC by setting five treatments with mass ratios of SSC to lateritic soil as 0%:100% (CK), 15%:85% (S15), 30%:70% (S30), 60%:40% (S60), and 100%:0% (S100). As expected, the fertility and heavy metal concentrations (Cu, Zn, Pb and Cd) in substrate significantly increased with SSC addition. The best performance in terms of plant height, ground diameter, biomass and N, P, K uptake were found i n S30, implying a reasonable amount of SSC could benefit the growth of M. persiciforma. The concentrations of Cu, Pb and Cd in S30 were insignificantly different from CK after harvest, indicating that M. persiciforma reduced the risk of heavy metal contamination of soil arising from SSC application. This study suggests that a reasonable rate of SSC addition can enhance M. persiciforma growth without causing the contamination of landscaping soil by heavy metals
Supplemental Material, Supplementary_tables_and_figures - Prediction of Target Genes and Pathways Associated With Cetuximab Insensitivity in Colorectal Cancer
No full textSupplemental Material, Supplementary_tables_and_figures for Prediction of Target Genes and Pathways Associated With Cetuximab Insensitivity in Colorectal Cancer by Chaoran Yu, Hiju Hong, Jiaoyang Lu, Xuan Zhao, Wenjun Hu, Sen Zhang, Yaping Zong, Zhihai Mao, Jianwen Li, Mingliang Wang, Bo Feng, Jing Sun, and Minhua Zheng in Technology in Cancer Research & Treatment</p
sj-pdf-3-jet-10.1177_15266028211032956 – Supplemental material for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching
No full textSupplemental material, sj-pdf-3-jet-10.1177_15266028211032956 for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching by Huan Xu, Ziqiang Wu, Zhong Jin, Xiao Wu, Wangming Hu, Bing Liang, Guanhua Lou, Zixian Chen, Huan Yao, Xiongbing Chen, Xin Zhou, Han Xiao, Cenghao Yu, Delai Zhang, Daoying Gong, Lan Yang, Yaping Shi, Yiming Xu and Yong Wang in Journal of Endovascular Therapy</p
sj-docx-1-jet-10.1177_15266028211032956 – Supplemental material for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching
No full textSupplemental material, sj-docx-1-jet-10.1177_15266028211032956 for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching by Huan Xu, Ziqiang Wu, Zhong Jin, Xiao Wu, Wangming Hu, Bing Liang, Guanhua Lou, Zixian Chen, Huan Yao, Xiongbing Chen, Xin Zhou, Han Xiao, Cenghao Yu, Delai Zhang, Daoying Gong, Lan Yang, Yaping Shi, Yiming Xu and Yong Wang in Journal of Endovascular Therapy</p
sj-docx-2-jet-10.1177_15266028211032956 – Supplemental material for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching
No full textSupplemental material, sj-docx-2-jet-10.1177_15266028211032956 for Paeonol Suppresses Vasculogenesis Through Regulating Vascular Smooth Muscle Phenotypic Switching by Huan Xu, Ziqiang Wu, Zhong Jin, Xiao Wu, Wangming Hu, Bing Liang, Guanhua Lou, Zixian Chen, Huan Yao, Xiongbing Chen, Xin Zhou, Han Xiao, Cenghao Yu, Delai Zhang, Daoying Gong, Lan Yang, Yaping Shi, Yiming Xu and Yong Wang in Journal of Endovascular Therapy</p
Fractal dynamics analysis of the VHF radiation pulses during initial breakdown process of lightning
No full textAuthor name used in this publication: Chen, Mingli.Author name used in this publication: Du, Yaping.2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordRGCPolyU 512908EPublishedVoR allowe
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