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茶树喷灌防霜中植株储水/冰量动态变化与影响因素研究
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作者 潘庆民 鹿永宗 +3 位作者 张志 金矿 宋佳伟 胡永光 《农业机械学报》 EI CAS CSCD 北大核心 2024年第2期180-187,共8页
喷灌是园艺作物有效的防霜技术之一。为确定茶树喷灌防霜需水量和节约水资源,需研究喷灌过程中植株的储水/冰量动态变化及影响因素。本文设计了一种防滴落、茎杆水收集及称量组合装置,可直接精确获取整株茶树的储水/冰量;试验分析非冻... 喷灌是园艺作物有效的防霜技术之一。为确定茶树喷灌防霜需水量和节约水资源,需研究喷灌过程中植株的储水/冰量动态变化及影响因素。本文设计了一种防滴落、茎杆水收集及称量组合装置,可直接精确获取整株茶树的储水/冰量;试验分析非冻结和冻结、微量和摇臂2类喷头条件下储水/冰量变化的异同;最后探究了冻结下微量喷头喷灌时长对储冰量和茎杆水量的影响。研究结果表明,非冻结条件下,茶树储水量变化经历积累、动平衡和干燥3个阶段;冻结条件下的储冰量随喷灌进行持续增加,并在停喷后较长时间内保持不变,即积累和保持阶段,随后依次经历融化流失和干燥阶段;相同喷灌压力和时长下,微量喷头的储水量和储冰量分别是摇臂喷头的1.2倍和2.0倍;微量喷头喷灌时长对最大储水量无明显影响,约为0.22 kg,最大储冰量则随喷灌时长的增加而显著增加,1.5 h的储冰量是0.5 h的2.9倍。微量喷头作用的茎杆水量,在非冻结和冻结条件下也较高,分别是摇臂喷头的3.0倍和2.7倍。本文研究了茶树植株表面储水/冰量变化及影响因素,改进了灌木类植物冠层截留量的测量方法,为提升防霜效果和实现精准喷灌奠定了基础。 展开更多
关键词 茶树 防霜 喷灌 冠层截留 储水量 储冰量
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Association between Meeting 24-Hour Movement Guidelines and Psychological Features of Chinese Emerging Adults 被引量:1
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作者 Yanjie Zhang jin kuang +2 位作者 Xun Luo Mengxian Zhao Xiaolei Liu 《International Journal of Mental Health Promotion》 2024年第5期399-406,共8页
Background:Emerging adulthood is a pivotal life stage,presenting significant psychological and social changes,such as decreased sociability,depression,and other mental health problems.Previous studies have associated ... Background:Emerging adulthood is a pivotal life stage,presenting significant psychological and social changes,such as decreased sociability,depression,and other mental health problems.Previous studies have associated these changes with an unhealthy lifestyle.The 24-h movement guidelines for healthy lifestyles have been developed to promote appropriate health behaviors and improve individual wellness.However,the relationship between adherence to the 24-h movement guidelines and different characteristics of Chinese emerging adults is yet to be explored.This cross-sectional study aimed to investigate the association between adherence to the 24-h movement guidelines and four characteristics(self-exploration,instability,possibilities,and responsibility)of Chinese emerging adults.Methods:Overall,1,510 Chinese emerging adults aged 18–29 years were included in this study.Each participant completed a self-administered questionnaire that included questions on adherence to the 24-h movement guidelines(physical activity,sedentary behavior,and sleep)and the inventory of dimensions of emerging adulthood.Multivariable logistic regression analysis was employed to investigate the associations between adherence to the 24-h movement guidelines and each of the four characteristics.Results:The proportion of participants who adhered to the 24-h movement guidelines was 31.72%.Multiple regression analysis revealed a significantly negative relationship between adhering to more guidelines and instability(β=−0.51,p<0.001).A statistically significant association was observed between instability and meeting only sedentary behavior(β=−1.27,95%confidence interval[CI]:[−2.32,−0.24],p=0.02),sedentary behavior+sleep(β=−1.30,95%CI:[−2.24,−0.35],p<0.01),and physical activity+sedentary behavior(β=−1.08,95%CI:[1.94,−0.21],p=0.02)guidelines.Further,positive and significant associations were observed between possibilities and meeting the guidelines for only physical activity(β=0.70,95%CI:[0.14,1.27),p=0.01),only sleep(β=0.61,95%CI:[0.01,1.21],p=0.04),physical activity+sedentary behavior(β=0.56,95%CI:[0.04,1.07),p=0.01),and physical activity+sleep(β=0.76,95%CI:[0.23,1.27],p=0.01).Conclusions:These findings suggest that adherence to the 24-h movement guidelines was associated with instability in Chinese emerging adults.Future studies are warranted to verify our findings to highlight the importance of maintaining a heath lifestyle to promote health in emerging adulthood. 展开更多
关键词 24-h movement behavior physical activity sedentary behavior SLEEP psychological health emerging adults
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经尿道膀胱肿瘤铥激光整块剜除术与等离子整块剜除术对比分析 被引量:1
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作者 陈光 丁兵 +1 位作者 邝金 鲁雄兵 《中国内镜杂志》 2022年第9期1-6,共6页
目的比较经尿道膀胱肿瘤铥激光整块剜除术(ThuLEBT)与等离子整块剜除术(TeURBT)治疗浅表性膀胱肿瘤的临床疗效。方法选取2018年9月—2020年9月收治的病理诊断为浅表性膀胱肿瘤的患者225例,分为ThuLEBT组(n=107)和TeURBT组(n=118),ThuLEB... 目的比较经尿道膀胱肿瘤铥激光整块剜除术(ThuLEBT)与等离子整块剜除术(TeURBT)治疗浅表性膀胱肿瘤的临床疗效。方法选取2018年9月—2020年9月收治的病理诊断为浅表性膀胱肿瘤的患者225例,分为ThuLEBT组(n=107)和TeURBT组(n=118),ThuLEBT组行ThuLEBT,TeURBT组行TeURBT。观察两组患者手术时间、术中闭孔神经反射发生率、术后血尿持续时间、留置导尿时间、膀胱刺激征发生率、术后住院时间和术后病理标本肌层发现率。术后随访1年,定期规律行膀胱灌注化疗及膀胱镜检查,记录肿瘤复发情况。结果两组患者均顺利完成手术,两组患者手术时间比较,差异无统计学意义(P>0.05);ThuLEBT组术中出血量少于TeURBT组,术后出血时间、导尿管留置时间和术后住院时间短于TeURBT组,差异均有统计学意义(P<0.05);ThuLEBT组术中闭孔神经反射发生率、术后膀胱刺激征发生率和随访1年复发率低于TeURBT组,差异均有统计学意义(P<0.05);ThuLEBT组术后病理检测膀胱肌层包含率明显高于TeURBT组,差异有统计学意义(P<0.05)。结论ThuLEBT应用于非肌层浸润性膀胱肿瘤手术,治疗效果确切,患者获益明显,值得临床进一步推广应用。 展开更多
关键词 膀胱肿瘤 铥激光整块剜除术 等离子整块剜除术 预后 对比分析
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The Relationship between Dimensions of Emerging Adulthood and Behavioral Problems among Chinese Emerging Adults: The Mediating Role of Physical Activity and Self- Control 被引量:1
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作者 jin kuang Jeffrey Jensen Arnett +9 位作者 Erle Chen Zsolt Demetrovics Fabian Herold Rebecca Y.M.Cheung Daniel L.Hall Michaela Markwart Markus Gerber Sebastian Ludyga Arthur F.Kramer Liye Zou 《International Journal of Mental Health Promotion》 2023年第8期937-948,共12页
Emerging adulthood(EA)is a critical stage of life to develop and sustain a healthy lifestyle,which is also a time of vulnerability to poor physical and mental health outcomes.In this study,we conducted a path analysis... Emerging adulthood(EA)is a critical stage of life to develop and sustain a healthy lifestyle,which is also a time of vulnerability to poor physical and mental health outcomes.In this study,we conducted a path analysis(N=1326)to examine associations among four dimensions of EA,levels of regular physical activity(PA),self-control,MPA tendency and irrational procrastination.Results found:1)higher levels of PA predicted both MPA tendency(β=−0.08,95%CI:−0.11 to−0.06,p<0.001)and irrational procrastination(β=−0.01,95%CI:−0.17 to−0.008,p<0.01)indirectly via self-control;2)Instability(β=0.13,95%CI:0.08 to 0.18,p<0.01)and Responsibility(β=−0.06,95%CI:−0.10 to−0.08,p=0.03)exerted direct effects on irrational procrastination and Instability also indirectly predicted irrational procrastination via MPA tendency(β=0.03,95%CI:0.02 to 0.05,p<0.01).These findings proved that perceived features of EA are linked to behavioral problems and supported that regular PA plays a crucial role to protect mental health. 展开更多
关键词 Emerging adulthood Chinese culture physical activity mobile phone addiction irrational procrastination SELF-CONTROL
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Relationships between Features of EmergingAdulthood, Situated Decisions toward PhysicalActivity, and Physical Activity among CollegeStudents: The Moderating Role of ExerciseIntensity Tolerance 被引量:1
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作者 jinghua Chen Zihe Wang +5 位作者 Fabian Herold Alyx Taylor jin kuang Ting Wang Arthur F.Kramer Liye Zou 《International Journal of Mental Health Promotion》 2023年第11期1209-1217,共9页
A significant portion of emerging adults do not achieve recommended levels of physical activity (PA). Previous studies observedassociations between features of emerging adulthood and PA levels, while the potential psy... A significant portion of emerging adults do not achieve recommended levels of physical activity (PA). Previous studies observedassociations between features of emerging adulthood and PA levels, while the potential psychological mechanisms that mightexplain this phenomenon are not fully understood. In this context, there is some evidence that situated decisions towardphysical activity (SDPA) and exercise-intensity tolerance might influence PA level. To provide empirical support for thisassumption, the current study investigated whether (i) features of emerging adulthood are linked to SDPA, which, in turn,might affect PA engagement;(ii) exercise-intensity tolerance moderate the relationship between SDPA and PA level;and (iii)SDPA is a mediator of the relationship between features of emerging adulthood and PA levels under the prerequisite thatexercise-intensity tolerance moderates the link between SDPA and PA engagement. In this study a group of 1,706 Chinesecollege students was recruited and asked to complete a set of questionnaires assessing their SDPA, PA levels, exercise-intensitytolerance, and features associated with emerging adulthood, namely Self-exploration, Instability, and Possibility. Our resultsindicated that SDPA positively predicted PA levels and this relationship became stronger when exercise-intensity tolerance wasused as a moderator. Furthermore, it was observed that individuals with a higher level of Instability and a lower level ofPossibility during emerging adulthood exhibited a lower level of SDPA. Taken together, the results of our study providefurther insights on a potential psychological mechanism linking features of emerging adulthood and physical activity. 展开更多
关键词 Emerging adulthood situated decisions physical activity exercise-intensity tolerance moderated model
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Validity and Reliability of the Preference for and Tolerance of the Intensity of Exercise Questionnaire among Chinese College Students
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作者 Ting Wang jin kuang +5 位作者 Fabian Herold Alyx Taylor Sebastian Ludyga Zhihao Zhang Arthur FKramer Liye Zou 《International Journal of Mental Health Promotion》 2023年第1期127-138,共12页
The rising prevalence of physical inactivity is in all age groups(e.g.,in college students)a major public health issue as not meeting the recommended minimum amount of regular physical activity is linked to adverse he... The rising prevalence of physical inactivity is in all age groups(e.g.,in college students)a major public health issue as not meeting the recommended minimum amount of regular physical activity is linked to adverse health events.Vice versa,there is mounting evidence that achieving the recommended amount of regular physical activity is a vital element to prevent chronic diseases,but there is often an insufficient adherence to planned and structured forms of physical activity(i.e.,physical exercises).In this context,there is a large body of evidence indicating that exercise adherence is,among other factors,influenced by exercise-related affective responses.The Preference for and Tolerance of the Intensity of Exer-cise Questionnaire(PRETIE-Q)has been developed to measure these affective responses(e.g.,to specific exercise inten-sities).So far,no validated Chinese version of the PRETIE-Q has been available in the literature.To address this gap in literature,the present study developed and validated a Chinese version of the PRETIE-Q in a large sample of Chinese college students.Data from a total of 1117 college students were collected for analyses concerning factorial validity and construct validity.The re-test reliability was established using a sample of 150 randomly selected participants.In addition,the level of regular physical activity(PA),cardiorespiratoryfitness(CRF),and resilience were used to examine possible links with two domains(preference and tolerance)of the PRETIE-Q.Our results showed that a Chinese version of the PRETIE-Q has a goodfit and reliability(Cronbach’sαof 0.72 to 0.85 for preference and tolerance,respectively;ICC:r=0.72 of preference and r=0.67 of tolerance;fit indices:χ^(2)=21.612,df=19,p>0.05,TLI=0.997,CFI=0.998,RMSEA=0.016,SRMR=0.024).Secondly,positive associations of intensity-tolerance with PA,CRF,and resilience were observed.In summary,this study indicates that the Chinese version of the PRETIE-Q has sound psychometric properties and can be used in Chinese college students.The adapted version of the PRETIE-Q paves the way for further research on exer-cise-related affective responses in Chinese-speaking samples,although the generalizability of ourfindings needs to be established for other cohorts such as adolescents and older people with and without chronic diseases. 展开更多
关键词 PRETIE-Q PLEASURE INTENSITY tolerance PREFERENCE validity
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均压环对覆冰状况下交流超高压柱式绝缘子闪络电压的影响
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作者 金矿 何相奎 +1 位作者 孔韬 程俊翔 《通信电源技术》 2018年第5期99-101,104,共4页
基于试验和数值模拟,研究了均压环对于增湿积冰的两联超高压柱式绝缘子的影响,并计算了融冰期间的临界闪络电压,确定了融冰期间导电水膜存在处的临界闪络电压。在实验测试和数值模拟的同时,利用有限元数值模拟方法(FEM),通过Comsol Mult... 基于试验和数值模拟,研究了均压环对于增湿积冰的两联超高压柱式绝缘子的影响,并计算了融冰期间的临界闪络电压,确定了融冰期间导电水膜存在处的临界闪络电压。在实验测试和数值模拟的同时,利用有限元数值模拟方法(FEM),通过Comsol Multiphysics软件,研究了绝缘子开始积冰时均压环对两联绝缘子上电势与电场分布的影响。 展开更多
关键词 输电线路 绝缘子 闪络 有限元
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