为了解中西太平洋金枪鱼围网渔业的渔获组成及其时空变化规律,根据1984—2020年中国、美国、西班牙围网作业渔船在中西太平洋海域的生产统计资料,对金枪鱼渔获量、单位捕捞努力量渔获量(catch per unit effort,CPUE)以及鲣(Katsuwonus p...为了解中西太平洋金枪鱼围网渔业的渔获组成及其时空变化规律,根据1984—2020年中国、美国、西班牙围网作业渔船在中西太平洋海域的生产统计资料,对金枪鱼渔获量、单位捕捞努力量渔获量(catch per unit effort,CPUE)以及鲣(Katsuwonus pelamis)、黄鳍金枪鱼(Thunnus albacares)和大眼金枪鱼(Thunnus obesus)3种金枪鱼渔获量比例等进行分析,重点研究了渔获率的年代间变化。结果表明:1)同一作业方式的不同船队鱼种渔获量比重相似;自由集群与人工集鱼装置(fish aggregation devices,FADs)的鱼种渔获量组成存在显著差异(P<0.05,R=0.528),近年间,自由集群作业方式渔获比重增大。2)各船队捕捞区域主要集中于太平洋西部海域,不同年代捕捞热点区域与物种组成存在差异,而同一年代内各物种渔获量比例较为相似,统计年间渔场中心呈从西部海域向东南方向移动的趋势。3)3种金枪鱼CPUE季间差异较小,鲣年间CPUE差异较大,呈连年增加的趋势。研究结果可为中西太平洋金枪鱼围网渔业的可持续发展提供科学参考。展开更多
对工业纯钛TA2的电解抛光/腐蚀的电解液配方和工艺参数进行了研究与优化,得到的最佳电解液配方是90 mLHF,20 g(NH_(4))_(2)S_(2)O_(8),200 mL CH_(3)CH_(2)OH,360 mL H2O,与之匹配的工艺参数是抛光电压50 V,电解液流量20 mL/s,抛光时间5...对工业纯钛TA2的电解抛光/腐蚀的电解液配方和工艺参数进行了研究与优化,得到的最佳电解液配方是90 mLHF,20 g(NH_(4))_(2)S_(2)O_(8),200 mL CH_(3)CH_(2)OH,360 mL H2O,与之匹配的工艺参数是抛光电压50 V,电解液流量20 mL/s,抛光时间50 s,电解抛光/腐蚀后得到的试样表面平整,组织清晰,无污染,且制样时间短,较机械抛光/腐蚀有很大的进步,采用该配方,调整相应工艺参数便可电解抛光其他钛合金材料。展开更多
BACKGROUND Adolescence is a period marked by physiological and psychological imbalances,which pose an increased risk for adolescents with major depressive disorder(MDD)to commit non-suicidal self-injury(NSSI).AIM To i...BACKGROUND Adolescence is a period marked by physiological and psychological imbalances,which pose an increased risk for adolescents with major depressive disorder(MDD)to commit non-suicidal self-injury(NSSI).AIM To investigate the moderating role of social support utilization in depression and NSSI among adolescents with MDD.METHODS This cross-sectional study enrolled 314 adolescents with MDD(258 with NSSI,56 without)from a Chinese tertiary psychiatric hospital(2021-2023).Participants completed validated scales,including the self-esteem scale,the Barratt impulsiveness scale,the self-rating depression scale,and the teenager social support rating scale.Logistic regression and hierarchical regression analyses were used to examine predictors of NSSI and the moderating effect of social support utilization.RESULTS Results showed that the NSSI group had higher depression levels,lower selfesteem,and greater impulsivity.While overall social support was higher in the NSSI group,social support utilization significantly moderated the depression-NSSI relationship.Specifically,higher utilization levels weakened the association between depression and NSSI(β=-0.001,P<0.05).CONCLUSION These findings suggest that effective utilization of social support,rather than its mere presence,is crucial in reducing NSSI risk among depressed adolescents.展开更多
The development of high-performance dual-band photodetectors(PDs)capable of simultaneous deep ultraviolet(DUV)and infrared(IR)detection is critical for advanced optoelectronic applications,particularly in missile warn...The development of high-performance dual-band photodetectors(PDs)capable of simultaneous deep ultraviolet(DUV)and infrared(IR)detection is critical for advanced optoelectronic applications,particularly in missile warning and target identification systems.Conventional UV/IR PDs often suffer from UV(320-400 nm)noise interference and limited responsivity due to the use of narrow-bandgap semiconductors and self-powered operation modes.To address these challenges,high-quality β-Ga_(2)O_(3)thin films were epitaxially grown on c-plane sapphire via metalorganic chemical vapor deposition(MOCVD),exhibiting excellent crystallinity and surface morphology.Unlike conventional heterojunctions(β-Ga_(2)O_(3)/graphene or β-Ga_(2)O_(3)/TMDs),the β-Ga_(2)O_(3)/BP structure leverages BP's tunable bandgap and high carrier mobility while maintaining strong type-Ⅱ band alignment,thereby facilitating efficient charge separation under both UV and IR illumination.We present a high-sensitivity dual-band PD based on a β-Ga_(2)O_(3)/black phosphorus(BP)pn heterojunction.The ultrawide bandgap of β-Ga_(2)O_(3)enables selective detection of DUV light while effectively suppressing interference from long-wave ultraviolet(UVA,320-400 nm),whereas BP provides a layer-dependent infrared(IR)response.Photocurrent analysis reveals distinct carrier transport mechanisms,with electrons dominating under UV illumination and holes contributing predominantly under IR exposure.A systematic investigation of the bias-dependent photoresponse demonstrates that the responsivity increases significantly at higher voltages.Under a 7 V bias,the device exhibits a high responsivity of 4.63×10^(-2)mA/W at 254 nm and 2.35×10^(-3)mA/W at 850 nm.This work not only provides a viable strategy for developing high-performance dual-band PDs but also advances the understanding of heterojunction-based optoelectronic devices for military and sensing applications.展开更多
文摘为了解中西太平洋金枪鱼围网渔业的渔获组成及其时空变化规律,根据1984—2020年中国、美国、西班牙围网作业渔船在中西太平洋海域的生产统计资料,对金枪鱼渔获量、单位捕捞努力量渔获量(catch per unit effort,CPUE)以及鲣(Katsuwonus pelamis)、黄鳍金枪鱼(Thunnus albacares)和大眼金枪鱼(Thunnus obesus)3种金枪鱼渔获量比例等进行分析,重点研究了渔获率的年代间变化。结果表明:1)同一作业方式的不同船队鱼种渔获量比重相似;自由集群与人工集鱼装置(fish aggregation devices,FADs)的鱼种渔获量组成存在显著差异(P<0.05,R=0.528),近年间,自由集群作业方式渔获比重增大。2)各船队捕捞区域主要集中于太平洋西部海域,不同年代捕捞热点区域与物种组成存在差异,而同一年代内各物种渔获量比例较为相似,统计年间渔场中心呈从西部海域向东南方向移动的趋势。3)3种金枪鱼CPUE季间差异较小,鲣年间CPUE差异较大,呈连年增加的趋势。研究结果可为中西太平洋金枪鱼围网渔业的可持续发展提供科学参考。
文摘对工业纯钛TA2的电解抛光/腐蚀的电解液配方和工艺参数进行了研究与优化,得到的最佳电解液配方是90 mLHF,20 g(NH_(4))_(2)S_(2)O_(8),200 mL CH_(3)CH_(2)OH,360 mL H2O,与之匹配的工艺参数是抛光电压50 V,电解液流量20 mL/s,抛光时间50 s,电解抛光/腐蚀后得到的试样表面平整,组织清晰,无污染,且制样时间短,较机械抛光/腐蚀有很大的进步,采用该配方,调整相应工艺参数便可电解抛光其他钛合金材料。
基金Jiangsu Province Social Development Project,No.BE2022735Jiangsu Innovative and Entrepreneurial Talent Programme,No.JSSCBS20211584+1 种基金Suzhou Clinical Key Disciplines for Geriatric Psychiatry,No.SZXK202116Suzhou Science and Technology Program Projects,No.SKY2023075,No.SYWD2024037 and No.MSXM2024032.
文摘BACKGROUND Adolescence is a period marked by physiological and psychological imbalances,which pose an increased risk for adolescents with major depressive disorder(MDD)to commit non-suicidal self-injury(NSSI).AIM To investigate the moderating role of social support utilization in depression and NSSI among adolescents with MDD.METHODS This cross-sectional study enrolled 314 adolescents with MDD(258 with NSSI,56 without)from a Chinese tertiary psychiatric hospital(2021-2023).Participants completed validated scales,including the self-esteem scale,the Barratt impulsiveness scale,the self-rating depression scale,and the teenager social support rating scale.Logistic regression and hierarchical regression analyses were used to examine predictors of NSSI and the moderating effect of social support utilization.RESULTS Results showed that the NSSI group had higher depression levels,lower selfesteem,and greater impulsivity.While overall social support was higher in the NSSI group,social support utilization significantly moderated the depression-NSSI relationship.Specifically,higher utilization levels weakened the association between depression and NSSI(β=-0.001,P<0.05).CONCLUSION These findings suggest that effective utilization of social support,rather than its mere presence,is crucial in reducing NSSI risk among depressed adolescents.
基金supported by the National Natural Science Foundation of China(Grant No.U22A2073)。
文摘The development of high-performance dual-band photodetectors(PDs)capable of simultaneous deep ultraviolet(DUV)and infrared(IR)detection is critical for advanced optoelectronic applications,particularly in missile warning and target identification systems.Conventional UV/IR PDs often suffer from UV(320-400 nm)noise interference and limited responsivity due to the use of narrow-bandgap semiconductors and self-powered operation modes.To address these challenges,high-quality β-Ga_(2)O_(3)thin films were epitaxially grown on c-plane sapphire via metalorganic chemical vapor deposition(MOCVD),exhibiting excellent crystallinity and surface morphology.Unlike conventional heterojunctions(β-Ga_(2)O_(3)/graphene or β-Ga_(2)O_(3)/TMDs),the β-Ga_(2)O_(3)/BP structure leverages BP's tunable bandgap and high carrier mobility while maintaining strong type-Ⅱ band alignment,thereby facilitating efficient charge separation under both UV and IR illumination.We present a high-sensitivity dual-band PD based on a β-Ga_(2)O_(3)/black phosphorus(BP)pn heterojunction.The ultrawide bandgap of β-Ga_(2)O_(3)enables selective detection of DUV light while effectively suppressing interference from long-wave ultraviolet(UVA,320-400 nm),whereas BP provides a layer-dependent infrared(IR)response.Photocurrent analysis reveals distinct carrier transport mechanisms,with electrons dominating under UV illumination and holes contributing predominantly under IR exposure.A systematic investigation of the bias-dependent photoresponse demonstrates that the responsivity increases significantly at higher voltages.Under a 7 V bias,the device exhibits a high responsivity of 4.63×10^(-2)mA/W at 254 nm and 2.35×10^(-3)mA/W at 850 nm.This work not only provides a viable strategy for developing high-performance dual-band PDs but also advances the understanding of heterojunction-based optoelectronic devices for military and sensing applications.
