废蚕丝中提取丝胶工艺研究     

蓝建京  甘配芳 《河池学院学报》2011,31(5):56-60

通过对透析法、酸析法和冰冻法提取丝胶效果的比较,得出冰冻法是提取丝胶的较好的方法,其最佳的提取条件是:pH=4,-20℃,冰冻时间为13 h,丝胶液浓度为32.8%。  相似文献   

从理论宣传角度审视五四时期“问题与主义”之争     

葛传根 《信阳师范学院学报(哲学社会科学版)》2011,(3):11-14

20世纪初的＂问题与主义＂之争早已尘埃落定,但它所警告的教条主义空谈理论的危险并没有随之消失。＂问题与主义＂之争中提出的宣传＂主义＂和＂学理＂的方法,对我们今天的理论宣传仍有很大启发。  相似文献   

我国运动休闲产业联动机制创新发展研究     

冯俊祥 《广州体育学院学报》2017,37(3):59-61

在世界市场经济的语境中,联动机制是在不同企业乃至产业间的互动协调机制,它使得企业或者产业间的合作更加高效,从而可以节约资源,提高产品的生产效益和专业化程度.运动休闲产业涉及的企业种类和产业众多,内部产业链结构复杂,因此建立产业联动机制对于运动休闲产业发展来讲更加迫切.我国运动休闲产业在前期的意识转变、产业结构调整和市场准备等方面都取得了重要进展,但目前处于发展的瓶颈期.构建多种机制交织的运动休闲产业联动机制是冲破瓶颈期,取得运动休闲产业发展的必要条件.  相似文献   

Maternal history of child maltreatment and maternal depression risk in the perinatal period: A longitudinal study     

《Child abuse & neglect》2017

Existing research is limited, with only a few studies considering each single type and multiple types of child maltreatment (CM) as well as multiple assessments of maternal depression throughout the perinatal period. The purpose of the study was to assess each type and accumulative types of CM in relation to the risk of maternal depression throughout the perinatal period. In total, 276 pregnant women were recruited from the prenatal clinic at a general hospital in China. Maternal CM history and depression risk were assessed at late pregnancy, postpartum week 1, and postpartum week 4 using the Childhood Trauma Questionnaire (CTQ) and Edinburgh Postnatal Depression Scale (EPDS). The GEE showed that physical and emotional neglect and multiple types of CM were associated with higher overall depression risk across the perinatal period. The multinomial regression models showed physical neglect and multiple types of CM predicted higher risk of both antepartum and postpartum depression. Emotional and sexual abuse and emotional neglect predicted antepartum depression risk, while none of the three types of CM predicted postpartum depression risk. Physical abuse did not predict antepartum and postpartum depression risk. The findings suggest that maternal history of child physical and emotional neglect play significant roles in perinatal depression risk with physical neglect as the most important predictor. Routine screening for maternal CM history and depression risk in prenatal clinics is needed to aid in the early detection and treatment of depression.  相似文献   

Sand training: Exercise-induced muscle damage and inflammatory responses to matched-intensity exercise     

Henry Brown  Brian Dawson  Martyn J. Binnie  Hugh Pinnington  Marc Sim  Tristan D. Clemons 《European Journal of Sport Science》2017,17(6):741-747

This study compared markers of muscle damage and inflammation elevated by a matched-intensity interval running session on soft sand and grass surfaces. In a counterbalanced, repeated-measures and crossover design, 10 well-trained female athletes completed 2 interval-based running sessions 1 week apart on either a grass or a sand surface. Exercise heart rate (HR) was fixed at 83–88% of HR maximum. Venous blood samples were collected pre-, post- and 24?h post-exercise, and analysed for myoglobin (Mb) and C-reactive protein (CRP). Perceptual ratings of exertion (RPE) and muscle soreness (DOMS) were recorded immediately post- and 24?h post-exercise. A significant time effect showed that Mb increased from pre- to post-exercise on grass (p?=?.008) but not on sand (p?=?.611). Furthermore, there was a greater relative increase in Mb on grass compared with that on sand (p?=?.026). No differences in CRP were reported between surfaces (p?>?.05). The HR, RPE and DOMS scores were not significantly different between conditions (p > .05). These results suggest that in response to a matched-intensity exercise bout, markers of post-exercise muscle damage may be reduced by running on softer ground surfaces. Such training strategy may be used to minimize musculoskeletal strain while still incurring an equivalent cardiovascular training stimulus.  相似文献   

Thermoneutral immersion exercise accelerates heart rate recovery: A potential novel training modality     

Mauricio Garzon  Olivier Dupuy  Laurent Bosquet  Anil Nigam  Alain Steve Comtois  Martin Juneau 《European Journal of Sport Science》2017,17(3):310-316

This study compared heart rate recovery (HRR) after incremental maximal exercise performed at the same external power output (P_ext) on dry land ergocycle (DE) vs. immersible ergocycle (IE). Fifteen young healthy participants (30?±?7 years, 13 men and 2 women) performed incremental maximal exercise tests on DE and on IE. The initial P_ext on DE was 25?W and was increased by 25?W/min at a pedalling cadence between 60 and 80?rpm, while during IE immersion at chest level in thermoneutral water (30°C), the initial P_ext deployment was at a cadence of 40?rpm which was increased by 10?rpm until 70?rpm and thereafter by 5?rpm until exhaustion. Gas exchange and heart rate (HR) were measured continuously during exercise and recovery for 5?min. Maximal HR (DE: 176?±?15 vs. IE 169?±?12?bpm) reached by the subjects in the two conditions did not differ (P?>?.05). Parasympathetic reactivation parameters (ΔHR from 10 to 300?s) were compared during the DE and IE HR recovery recordings. During the IE recovery, parasympathetic reactivation in the early phase was more predominant (HRR at Δ10–Δ60?s, P?<?.05), but similar in the late phase (HRR at Δ120–Δ300?s, P?>?.05) when compared to the DE condition. In conclusion, incremental maximal IE exercise at chest level immersion in thermoneutral water accelerates the early phase parasympathetic reactivation compared to DE in healthy young participants.  相似文献   

厌氧氨氧化菌活性的快速恢复及运行     

杨开亮  占志强  王莹  时继东  廖德祥  逯焕波  许乐平 《上海海事大学学报》2017,38(4):84-87

为研究厌氧氨氧化(anaerobic ammonium oxidizing,ANAMMOX)菌的活性恢复,采用SBR工艺对长时间(100 d左右)停止运行的反应器中ANAMMOX菌进行活性培养。经过22 d的恢复试验,ANAMMOX菌活性基本恢复,在第17天,NH+4—N和NO-2—N的转化率均在90%以上,TN的去除率在80%以上。在培养过程中,载体的颜色由白色逐渐变成淡黄色。结果表明,在常温闲置较长时间的反应器中ANAMMOX菌的活性可恢复性强,恢复周期短,恢复后的脱氮性能良好;ANAMMOX反应器通过对生物膜载体的培养可以使ANAMMOX菌的活性快速恢复。  相似文献   

民族地区中学物理教学评价改革浅析     

张晓娟  郑维民 《鸡西大学学报》2011,11(5):6-7

为了了解甘肃省少数民族地区义务教育阶段物理教学评价制度的情况,提高民族地区物理教学质量,我们采取了问卷调查和跟部分教师访谈的方法,并对发现的问题提出了相应的解决策略。  相似文献   

新民主主义革命时期党领导救灾工作的经验研究     

柴观珍  肖巧朋 《衡阳师范学院学报》2011,32(5)

中国共产党自成立之日起就把扶贫济困、改善民生作为自己的奋斗目标。尤其是在革命根据地建立,共产党开始局部执政以后,面对天灾人祸,党领导各根据地从实际出发,实施了一系列标本兼治的救灾措施,不但使根据地安然渡过了灾荒,而且为今天的防灾、救灾工作提供了经验和启示。  相似文献   

学生篮球运动疲劳产生机理及恢复方法     

陈文刚  沈时明 《鸡西大学学报》2011,11(10):145-146,158

为使学生篮球运动后疲劳尽快恢复,更好地投入到学习、工作中,利用学生篮球运动实践及观察方法、文献资料法及篮球运动理论进行研究发现,休息、睡眠、按摩、补充营养、物理疗法、心理恢复几种疲劳恢复方法可以使学生篮球运动疲劳得到很好的恢复,且多种恢复方法一起使用效果更佳。  相似文献