Fathers play an important role in adolescents’development,which is significant for their development and influences their mental health,including feeling of loneliness.However,the effects and mechanisms of father-lov...Fathers play an important role in adolescents’development,which is significant for their development and influences their mental health,including feeling of loneliness.However,the effects and mechanisms of father-love absence on individual loneliness are not clear.Based on the social functionalist theory and the social needs theory,this study examines the influence of individual fatherlove absence on loneliness and its underlying mechanisms.A questionnaire survey was administered to 319 junior high school students and 1,476 high school students.The results showed that adolescents with father-love absence had higher levels of loneliness,and that father-love absence affected loneliness levels through mediating pathways of individual gratitude,peer relationships,and gratitude to peer relationships.This study not only confirms the negative effects of father-love absence on adolescents’loneliness,but also explains the mediate roles of individual gratitude and peer relationships.It enriches the theoretical system related to family education and has important theoretical and practical implications for further interventions on adolescents’mental health from the perspective of fatherless parenting.展开更多
为了解决顺北油田二叠系钻进过程中漏失严重的问题,分析了顺北二叠系地层特征、漏失类型及裂缝宽度,揭示了二叠系漏失原因,总结了该油田防漏堵漏技术发展历程及取得的技术成果,并就目前面临的难题给出了技术攻关建议。分析可知,二叠系...为了解决顺北油田二叠系钻进过程中漏失严重的问题,分析了顺北二叠系地层特征、漏失类型及裂缝宽度,揭示了二叠系漏失原因,总结了该油田防漏堵漏技术发展历程及取得的技术成果,并就目前面临的难题给出了技术攻关建议。分析可知,二叠系地层破碎,多尺度复杂裂缝发育,漏失压力低,裂缝对井筒压力敏感,是造成地层漏失的主要原因。针对二叠系漏失,经历“逢漏就堵”、“避免承压”、“塌漏同治”及“优化完善”四个阶段,形成了随钻防漏、桥堵、随钻堵漏、凝胶堵漏、化学固结和全井堵漏浆等技术。2018年以来,在顺北蓬1、顺北鹰1等20余口井应用,单井平均漏失量由2017年之前的508 m 3降低为2020年的138 m 3(降低72.8%),单井堵漏时间由2017年之前的9.3 d降到2020年的2.6 d(降低72%),现场应用效果良好。展开更多
Dune fields at the northern margin of the East Asian monsoon (EAM), are mosaics of mobile and vegetation-stabilized aeolian dunes. These sand dunes are highly sensitive to environmental change, thus the distribution a...Dune fields at the northern margin of the East Asian monsoon (EAM), are mosaics of mobile and vegetation-stabilized aeolian dunes. These sand dunes are highly sensitive to environmental change, thus the distribution and the timing of their development may provide important clues to past environmental dynamics. Due to the strong wind erosion and dune migration, long and continuous stratigraphic records are seldom preserved. Synthesizing a large body of events, ultimately producing a relatively complete and high-resolution record, may be a proper method to investigate the dune development history and climate change. In this study, we synthesized a large body of luminescence ages for aeolian deposits from the Mu Us, Otindag, Horqin dune fields at the northern margin of the EAM. The results show that these dune fields, as a whole experienced a most extensive mobility during the early Holocene, followed by a widespread shift toward limited mobility and soil development in the mid-Holocene, and widespread reactivation occurred during late Holocene. The dune developments are directly linked to the effective moisture change controlled by the EAM changes, which respond to the low latitude summer insolation variation. The increased subsidence at the margin contrary to the core EAM, the delay from the feedback of the soil-vegetation-air coupled system, the increased evaporation due to the high temperature all play partial role in the lag of the margin EAM effective moisture change to the low latitude summer insolation. The asynchronous end of the wetter mid-Holocene mainly responds to the southeastwardly shift of the precipitation belt, while the regional sensitivity, response speed and internal feedback also contributed. The correspondence between dune records and North Atlantic drift-ice records of the rapid climate changes implies a close relationship between North Atlantic climate and the frequent dune activity at the northern margin of EAM.展开更多
基金the General Program of the National Socail Science Fund of China(23BSH144).
文摘Fathers play an important role in adolescents’development,which is significant for their development and influences their mental health,including feeling of loneliness.However,the effects and mechanisms of father-love absence on individual loneliness are not clear.Based on the social functionalist theory and the social needs theory,this study examines the influence of individual fatherlove absence on loneliness and its underlying mechanisms.A questionnaire survey was administered to 319 junior high school students and 1,476 high school students.The results showed that adolescents with father-love absence had higher levels of loneliness,and that father-love absence affected loneliness levels through mediating pathways of individual gratitude,peer relationships,and gratitude to peer relationships.This study not only confirms the negative effects of father-love absence on adolescents’loneliness,but also explains the mediate roles of individual gratitude and peer relationships.It enriches the theoretical system related to family education and has important theoretical and practical implications for further interventions on adolescents’mental health from the perspective of fatherless parenting.
文摘为了解决顺北油田二叠系钻进过程中漏失严重的问题,分析了顺北二叠系地层特征、漏失类型及裂缝宽度,揭示了二叠系漏失原因,总结了该油田防漏堵漏技术发展历程及取得的技术成果,并就目前面临的难题给出了技术攻关建议。分析可知,二叠系地层破碎,多尺度复杂裂缝发育,漏失压力低,裂缝对井筒压力敏感,是造成地层漏失的主要原因。针对二叠系漏失,经历“逢漏就堵”、“避免承压”、“塌漏同治”及“优化完善”四个阶段,形成了随钻防漏、桥堵、随钻堵漏、凝胶堵漏、化学固结和全井堵漏浆等技术。2018年以来,在顺北蓬1、顺北鹰1等20余口井应用,单井平均漏失量由2017年之前的508 m 3降低为2020年的138 m 3(降低72.8%),单井堵漏时间由2017年之前的9.3 d降到2020年的2.6 d(降低72%),现场应用效果良好。
基金financially supported by the National Science Foundation of China(Grant No.41102102)"Strategic Priority Research Program"of the Chinese Academy of Sciences(Grant No.XDB03020300)the Key Research Program of the Chinese Academy of Sciences(Grant No.KZZD-EW-04-03)
文摘Dune fields at the northern margin of the East Asian monsoon (EAM), are mosaics of mobile and vegetation-stabilized aeolian dunes. These sand dunes are highly sensitive to environmental change, thus the distribution and the timing of their development may provide important clues to past environmental dynamics. Due to the strong wind erosion and dune migration, long and continuous stratigraphic records are seldom preserved. Synthesizing a large body of events, ultimately producing a relatively complete and high-resolution record, may be a proper method to investigate the dune development history and climate change. In this study, we synthesized a large body of luminescence ages for aeolian deposits from the Mu Us, Otindag, Horqin dune fields at the northern margin of the EAM. The results show that these dune fields, as a whole experienced a most extensive mobility during the early Holocene, followed by a widespread shift toward limited mobility and soil development in the mid-Holocene, and widespread reactivation occurred during late Holocene. The dune developments are directly linked to the effective moisture change controlled by the EAM changes, which respond to the low latitude summer insolation variation. The increased subsidence at the margin contrary to the core EAM, the delay from the feedback of the soil-vegetation-air coupled system, the increased evaporation due to the high temperature all play partial role in the lag of the margin EAM effective moisture change to the low latitude summer insolation. The asynchronous end of the wetter mid-Holocene mainly responds to the southeastwardly shift of the precipitation belt, while the regional sensitivity, response speed and internal feedback also contributed. The correspondence between dune records and North Atlantic drift-ice records of the rapid climate changes implies a close relationship between North Atlantic climate and the frequent dune activity at the northern margin of EAM.
