In the practice of mining shallow buried ultra-close seams,support failure tends to occur during the process of longwall undermining beneath two layers of room mining goaf(TLRMG).In this paper,the factors causing supp...In the practice of mining shallow buried ultra-close seams,support failure tends to occur during the process of longwall undermining beneath two layers of room mining goaf(TLRMG).In this paper,the factors causing support failure are summarized into geology and mining technology.Combining column lithology and composite beam theory,the key stratum of the rock strata is determined.A finite element numerical simulation is used to analyze the overlying load distribution rule of the main roof for different plane positions of the upper and lower room mining pillars.The tributary area theory(TAT)is adopted to analyze the vertical load distribution of each pillar,and dynamic models of coal pillar instability and main roof fracture are established.Through key block instability analysis,two critical moments are established,of which critical moment A has the greater dynamic load strength.Great economic losses and safety hazards are created by the dynamic load of the fracturing of the main roof.To reduce these negative effects,a method of pulling out supports is developed and two alternative measures for support failure prevention are proposed:reinforcing stope supports in conjunction with reducing mining height,or drilling ground holes to pre-split the main roof.Based on a comprehensive consideration of economic factors and the two categories of support failure causes,the method of reinforcing stope supports while reducing mining height was selected for use on the mining site.展开更多
Block multiple measurement vectors (BMMV) is a reconstruction algorithm that can be used to recover the support of block K-joint sparse matrix X from Y = ΨX + V. In this paper, we propose a sufficient condition for a...Block multiple measurement vectors (BMMV) is a reconstruction algorithm that can be used to recover the support of block K-joint sparse matrix X from Y = ΨX + V. In this paper, we propose a sufficient condition for accurate support recovery of the block K-joint sparse matrix via the BMMV algorithm in the noisy case. Furthermore, we show the optimality of the condition we proposed in the absence of noise when the problem reduces to single measurement vector case.展开更多
Objectives: To investigate the effect of supportive measures guidelines on nurses’ practices during labor. Methods: A quasi-experimental design (an interventional pre and post-test study). Setting: The study was cond...Objectives: To investigate the effect of supportive measures guidelines on nurses’ practices during labor. Methods: A quasi-experimental design (an interventional pre and post-test study). Setting: The study was conducted at obstetric wards and intrapartum units at Nasser Institute Hospital. Sample: All nurses provide guided direct care, there were 40 nurses included in the study. Tools: Three tools were used to collect data named self-administered questionnaire sheet, labor supportive measures’ observational checklists, and nurses’ satisfaction sheet. Results: There was a highly significant improvement in total knowledge and total practical skills among the studied sample pre-intervention compared to immediate post and follow-up intervention (p ≤ 0.01). Additionally, 95% of the studied sample was satisfied with the advanced knowledge included in the guidelines. Conclusion: The supportive measures guidelines had an efficient improving nurses’ knowledge and practices post-intervention. Also, the majority of the studied sample was satisfied with the implemented guidelines. Recommendations: Implementation of labor supportive measure guidelines in different childbirth units to improve nurses’ practice. Further research is required to investigate parturient woman’s satisfaction with the childbirth process after implementing labor supportive measures and the effect of labor supportive measures on childbirth process outcome.展开更多
Despite the increasing popularity of mechanized coal mining, there are no convenient and accurate means available to measure the loads of powered supports. The measurement of such loads is important for monitoring min...Despite the increasing popularity of mechanized coal mining, there are no convenient and accurate means available to measure the loads of powered supports. The measurement of such loads is important for monitoring mine pressure and ensuring production safety. The load-carrying features of a powered support were used to develop a method for load measurement using the mag-netoelastic principle. A cross bridge-type magnetoelastic stress sensor was designed for the support structures to measure the different parts of the supports. Tests on single-body hydraulic cylinders and simulated linkages showed that an approximately linear relationship between the values of the sensor output signal and the loads borne by the hydraulic cylinders or linkages. The results were used to analyze the load-carrying measurements of powered supports with the cross bridge-type magnetoelastic stress sensor.展开更多
Neuronal regeneration in the peripheral nervous system arises via a synergistic interplay of neurotrophic factors,integrins,cytoskeletal proteins,mechanical cues,cytokines,stem cells,glial cells and astrocytes.
Nowadays,the wave of mergers and acquisitions in the capital market is still surging.High evaluation does bring high performance,and the huge impairment of goodwill has become a key factor for the frequent Black Swan ...Nowadays,the wave of mergers and acquisitions in the capital market is still surging.High evaluation does bring high performance,and the huge impairment of goodwill has become a key factor for the frequent Black Swan events of listed companies.Starting from the essence of goodwill,using Chinese A-share listed companies from 2007 to 2019 as samples and based on the market data,distribution analysis and performance impact,this paper argues that problems of goodwill impairment in China are incomplete accounting standards,inexhaustive impairment implementation and incomprehensive market supervision,thus giving reasonable suggestions.Proper follow-up measurement of goodwill is conducive to improving accounting information quality and adapting to capital market demands,which is of great significance to the revision of international standards.展开更多
目的探讨间接能量测定法指导个体化营养方案对休克型肺炎患者能量代谢的影响。方法选择2020年1月至2023年1月在连云港市第二人民医院接受治疗的96例休克型肺炎患者,分别采用间接能量测定法(能量代谢监护仪)计算每日静息能量消耗(REE)值...目的探讨间接能量测定法指导个体化营养方案对休克型肺炎患者能量代谢的影响。方法选择2020年1月至2023年1月在连云港市第二人民医院接受治疗的96例休克型肺炎患者,分别采用间接能量测定法(能量代谢监护仪)计算每日静息能量消耗(REE)值,根据随机数字表法分为观察组(48例)与对照组(48例),观察组制定个体化营养方案,对照组采用匀浆膳方案。比较两组患者营养支持治疗前后蛋白质代谢营养指标、上臂肌围、体质量指数、血糖及预后情况。结果观察组治疗2周后总蛋白(TP)、白蛋白(ALB)、前白蛋白(PA)水平、上臂肌围、体质量指数[分别为(66.42±12.37)g·L^(-1),(38.44±3.25)g·L^(-1),(28.37±2.89)g·L^(-1),(25.96±2.03)cm,(22.93±1.62)kg·m^(-2)]均高于对照组[分别为(58.57±11.48)g·L^(-1),(34.37±3.89)g·L^(-1),(24.88±3.16)g·L^(-1),(23.87±1.89)cm,(21.64±1.58)kg·m^(-2)](t=3.223,5.563,5.646,5.221,3.950,均P<0.05),而空腹血糖(FPG),餐后2 h血糖(2 h PG)水平[分别为(6.36±1.02)mmol·L^(-1),(8.05±1.64)mmol·L^(-1)]均低于对照组[分别为(7.54±1.09)mmol·L^(-1),(9.87±1.52)mmol·L^(-1)](t=5.476,5.639,均P<0.05)。观察组机械通气时间,ICU住院时间,28 d病死率及发热发生率[分别为(9.09±1.48)d,(15.36±1.78)d,18.75%,8.33%]均低于对照组[分别为(10.37±1.56)d,(17.49±1.67)d,27.08%,22.92%](t=4.124,6.046,χ^(2)=0.944,3.872,均P<0.05)。结论间接能量测定法指导个体化营养方案能有效改善休克型肺炎患者营养状况及预后。展开更多
基金supported by the National Natural Science Foundation of China (No. 51374200)
文摘In the practice of mining shallow buried ultra-close seams,support failure tends to occur during the process of longwall undermining beneath two layers of room mining goaf(TLRMG).In this paper,the factors causing support failure are summarized into geology and mining technology.Combining column lithology and composite beam theory,the key stratum of the rock strata is determined.A finite element numerical simulation is used to analyze the overlying load distribution rule of the main roof for different plane positions of the upper and lower room mining pillars.The tributary area theory(TAT)is adopted to analyze the vertical load distribution of each pillar,and dynamic models of coal pillar instability and main roof fracture are established.Through key block instability analysis,two critical moments are established,of which critical moment A has the greater dynamic load strength.Great economic losses and safety hazards are created by the dynamic load of the fracturing of the main roof.To reduce these negative effects,a method of pulling out supports is developed and two alternative measures for support failure prevention are proposed:reinforcing stope supports in conjunction with reducing mining height,or drilling ground holes to pre-split the main roof.Based on a comprehensive consideration of economic factors and the two categories of support failure causes,the method of reinforcing stope supports while reducing mining height was selected for use on the mining site.
文摘Block multiple measurement vectors (BMMV) is a reconstruction algorithm that can be used to recover the support of block K-joint sparse matrix X from Y = ΨX + V. In this paper, we propose a sufficient condition for accurate support recovery of the block K-joint sparse matrix via the BMMV algorithm in the noisy case. Furthermore, we show the optimality of the condition we proposed in the absence of noise when the problem reduces to single measurement vector case.
文摘Objectives: To investigate the effect of supportive measures guidelines on nurses’ practices during labor. Methods: A quasi-experimental design (an interventional pre and post-test study). Setting: The study was conducted at obstetric wards and intrapartum units at Nasser Institute Hospital. Sample: All nurses provide guided direct care, there were 40 nurses included in the study. Tools: Three tools were used to collect data named self-administered questionnaire sheet, labor supportive measures’ observational checklists, and nurses’ satisfaction sheet. Results: There was a highly significant improvement in total knowledge and total practical skills among the studied sample pre-intervention compared to immediate post and follow-up intervention (p ≤ 0.01). Additionally, 95% of the studied sample was satisfied with the advanced knowledge included in the guidelines. Conclusion: The supportive measures guidelines had an efficient improving nurses’ knowledge and practices post-intervention. Also, the majority of the studied sample was satisfied with the implemented guidelines. Recommendations: Implementation of labor supportive measure guidelines in different childbirth units to improve nurses’ practice. Further research is required to investigate parturient woman’s satisfaction with the childbirth process after implementing labor supportive measures and the effect of labor supportive measures on childbirth process outcome.
文摘Despite the increasing popularity of mechanized coal mining, there are no convenient and accurate means available to measure the loads of powered supports. The measurement of such loads is important for monitoring mine pressure and ensuring production safety. The load-carrying features of a powered support were used to develop a method for load measurement using the mag-netoelastic principle. A cross bridge-type magnetoelastic stress sensor was designed for the support structures to measure the different parts of the supports. Tests on single-body hydraulic cylinders and simulated linkages showed that an approximately linear relationship between the values of the sensor output signal and the loads borne by the hydraulic cylinders or linkages. The results were used to analyze the load-carrying measurements of powered supports with the cross bridge-type magnetoelastic stress sensor.
基金CSIRO, the ARC and the NHMRC for providing funding that supported this work
文摘Neuronal regeneration in the peripheral nervous system arises via a synergistic interplay of neurotrophic factors,integrins,cytoskeletal proteins,mechanical cues,cytokines,stem cells,glial cells and astrocytes.
文摘Nowadays,the wave of mergers and acquisitions in the capital market is still surging.High evaluation does bring high performance,and the huge impairment of goodwill has become a key factor for the frequent Black Swan events of listed companies.Starting from the essence of goodwill,using Chinese A-share listed companies from 2007 to 2019 as samples and based on the market data,distribution analysis and performance impact,this paper argues that problems of goodwill impairment in China are incomplete accounting standards,inexhaustive impairment implementation and incomprehensive market supervision,thus giving reasonable suggestions.Proper follow-up measurement of goodwill is conducive to improving accounting information quality and adapting to capital market demands,which is of great significance to the revision of international standards.
文摘目的探讨间接能量测定法指导个体化营养方案对休克型肺炎患者能量代谢的影响。方法选择2020年1月至2023年1月在连云港市第二人民医院接受治疗的96例休克型肺炎患者,分别采用间接能量测定法(能量代谢监护仪)计算每日静息能量消耗(REE)值,根据随机数字表法分为观察组(48例)与对照组(48例),观察组制定个体化营养方案,对照组采用匀浆膳方案。比较两组患者营养支持治疗前后蛋白质代谢营养指标、上臂肌围、体质量指数、血糖及预后情况。结果观察组治疗2周后总蛋白(TP)、白蛋白(ALB)、前白蛋白(PA)水平、上臂肌围、体质量指数[分别为(66.42±12.37)g·L^(-1),(38.44±3.25)g·L^(-1),(28.37±2.89)g·L^(-1),(25.96±2.03)cm,(22.93±1.62)kg·m^(-2)]均高于对照组[分别为(58.57±11.48)g·L^(-1),(34.37±3.89)g·L^(-1),(24.88±3.16)g·L^(-1),(23.87±1.89)cm,(21.64±1.58)kg·m^(-2)](t=3.223,5.563,5.646,5.221,3.950,均P<0.05),而空腹血糖(FPG),餐后2 h血糖(2 h PG)水平[分别为(6.36±1.02)mmol·L^(-1),(8.05±1.64)mmol·L^(-1)]均低于对照组[分别为(7.54±1.09)mmol·L^(-1),(9.87±1.52)mmol·L^(-1)](t=5.476,5.639,均P<0.05)。观察组机械通气时间,ICU住院时间,28 d病死率及发热发生率[分别为(9.09±1.48)d,(15.36±1.78)d,18.75%,8.33%]均低于对照组[分别为(10.37±1.56)d,(17.49±1.67)d,27.08%,22.92%](t=4.124,6.046,χ^(2)=0.944,3.872,均P<0.05)。结论间接能量测定法指导个体化营养方案能有效改善休克型肺炎患者营养状况及预后。
