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Search Results: 1 - 10 of 107942 matches for " 周继月 "
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湖南省柘溪水库人工增雨试验优化技术研究
樊志超,,,
气象 , 2012, DOI: 10.7519/j.issn.1000-0526.2012.8.012
Abstract: 在总结柘溪水库多年人工增雨发电试验经验的基础上,通过分析资水流域的气候特征、防汛形势、发电需求和安全生产要求,确定了柘溪水库人工增雨作业的适宜时段。通过分析近5年资水流域37次典型降雨日的天气形势和降雨特征,将影响流域降水的主要天气系统归类分型为西风带降雨系统、东风带降雨系统和地形云,并进一步确定了柘溪水库人工增雨作业的优化布局和作业方式。在分析库区特大致洪暴雨典型个例的基础上,找出了柘溪水库人工增雨作业需要规避的强降雨自然灾害高风险区域。
混菌同步发酵三七糠关键参数的测定
, 王永坤 , 朱国强 ,
扬州大学学报(农业与生命科学版) , 1998,
Abstract: ????绿色木霉(Y96301)、米曲霉(L96201)、白地霉(Y96101)、产朊假丝酵母(P96401)的生物学特性研究表明,Y96301在产酶培养基上具有较高的纤维素酶(CMCase、FPase、βGase)活性,其中CMC酶活力可达到4511IU,FP酶活力可达到1049IU,纤维素降解率为26.9%。在三七糠培养基进行混菌发酵试验表明,L96201、Y96101、P96401是Y96301的最佳配伍菌株。在30℃、pH6的条件下,培养28h可使产品纯蛋白含量达到22.13%,纤维素降解率为30.7%。该发酵产品经喂猪初步试用,适口性好,可部分替代动物蛋白和植物蛋白。
爆破震动及结构面渐进破坏对边坡稳定性影响
,才庆祥,,,韩流
采矿与安全工程学报 , 2014,
Abstract: 为了研究爆破震动及结构面渐进破坏对于边坡稳定性的影响,掌握爆破震动过程中的致损机理及稳定系数变化规律,根据结构面抗剪强度退化机理,明确了渐进破坏过程中抗剪强度变化规律;结合爆破动载荷的作用机理,修正了震动条件下抗滑力、下滑力的计算公式;基于此,推导出了平面和折面滑坡模式的时效稳定系数计算方法,并对哈尔乌素露天矿北端帮边坡稳定性进行研究。结果表明:结构面完好和贯通时的稳定系数分别为1.348和1.173。结构面渐进破坏过程中,边坡稳定系数呈线性递减,且递减的速度与岩体的黏聚力C呈正比;爆破震动作用下,边坡时效稳定系数以初始稳定系数为中心,响应震动加速度上下波动;爆破震动和结构面渐进损伤耦合作用下,边坡时效稳定系数在波动变化的同时呈现整体下滑趋势。
醇-胺直接脱氢及氧化脱氢偶联酰胺化反应
马文婵,,,
化学进展 , 2014, DOI: 10.7536/PC130740
Abstract: 醇-胺(氨)直接脱氢及氧化脱氢偶联生成酰胺具有原子经济性高和对环境友好等优点,因而受到广泛关注。研究发现,一些过渡金属钌及铑配合物、负载金及银纳米粒子、氧化锰分子筛(OMS-2)以及基于铜、铁化合物的催化体系在醇-胺(氨)直接脱氢或氧化脱氢偶联生成酰胺反应中显示出优良的催化性能。本文首先介绍了PNN-钌、NHC-钌配合物、铑配合物以及负载银原子簇催化的醇-胺(氨)直接脱氢偶联生成酰胺反应的研究进展,然后对负载纳米金粒子、氧化锰分子筛(OMS-2)以及基于铜、铁化合物的催化体系催化的不同氧化剂,包括分子氧、叔丁基过氧化氢以及分子碘氧化的氧化酰胺化反应进行了总结。对各催化剂或催化体系的适用范围和优缺点进行了分析,阐述了主要催化剂或催化体系的催化机理。此外,还对无过渡金属参与的醇-胺氧化酰胺化反应体系进行概述。最后,在总结现有成果的基础上指出了该领域的发展方向。
390MPa级Ti+Nb超低碳高强度BH钢组织性能研究
刘光明,康永林,,,,滕华湘
材料工程 , 2010,
Abstract: 对Ti+Nb+B复合处理超低碳高强度BH钢的热轧、冷轧和连续退火进行实验.结果表明试制的超低碳高强度BH钢退火板的屈强比为0.536,烘烤硬化值为44MPa,具有较为优良的成形性能和烘烤硬化性能,抗拉强度为394MPa,达到了390MPa级超低碳高强度BH钢板的强度要求.物理化学相分析表明添加在超低碳高强度BH钢中的B除了析出了2mg/kg的BN,大部分的B在钢中以间隙固溶的形式存在,对超低碳高强度BH钢基体起到了固溶强化的作用.
复烤片烟自然醇化过程中品质变化研究进展
刘磊,王涛,史绍新,,赵庆华,资文华
河南农业科学 , 2015,
Abstract: 醇化对复烤片烟品质的提升起到了重要作用,综述了复烤片烟的醇化机制及自然醇化过程中品质评价指标的变化规律,并探讨了影响自然醇化效果的因素,最后提出了目前自然醇化研究面临的几个关键问题,并对烟叶醇化的研究和发展前景进行了展望。
复合抑制剂对菊芋酶促褐变的影响
王卫东,,李超,王春燕,
食品科学 , 2010,
Abstract: ?采用磷酸盐缓冲液提取菊芋中的多酚氧化酶(ppo),并对其酶学特性进行研究。结果表明,菊芋多酚氧化酶最适温度50℃、最适ph值为4.0和8.0。动力学实验表明菊芋ppo的米氏常数km39.27mmol/l、最大反应速率vmax为1.369u/min。通过响应面试验设计对菊芋酶促褐变的抑制剂配方进行优化,结果表明:用质量度0.02g/100ml乙二胺四乙酸二钠(edta)、0.02g/100ml柠檬酸亚锡二钠和0.04g/100ml的抗坏血酸复合溶液浸泡30min,能有效防止菊芋在加工期间的酶促褐变。
水杉人工林细根解剖结构和菌根侵染研究
,,张高洁,,于水强,
南京林业大学学报(自然科学版) , 2016, DOI: 10.3969/j.issn.1000-2006.2016.06.015
Abstract: 林木根系是地下生态系统中最为复杂的部分之一,其高度异质性是关系到根系生态功能研究结果准确性与可比性的主要因素。为明晰水杉细根的界定范围,探讨水杉细根形态与解剖结构之间的关系,为未来的细根研究提供基础数据,笔者对水杉不同根序等级细根解剖结构与菌根侵染状况进行了研究。结果表明:水杉根系按根序法分级更为合理,并将水杉1、2级根定义为细根,1、2级根表皮完整、皮层较厚、皮层层数较多,3、4级根无表皮和皮层或仅残留少量皮层细胞,随根序等级增加,细根皮层层数和皮层厚度显著降低。随根序增加,周皮木栓化程度增加,维管组织发育逐渐完善,维管组织直径不断增大,维管组织与根系直径的比值(维根比)不断增大,细根直径主要与维管组织直径具有显著的相关性(1级根除外),与皮层薄壁细胞直径、皮层层数之间并无相关性。水杉1~3级根均可观察到菌根侵染现象,随根序等级升高菌根侵染率下降,不同根序等级细根单个个体根系的真菌侵染面积存在明显差异。在未来的细根研究中,应该将细根形态调查与解剖结构特征相结合以确定根序等级和直径的对应关系,进而确定细根的划分范围。
Tree root system is one of the most complex parts of the underground ecosystem. The accuracy and comparability in root ecological function studies is limited by highly heterogeneous morphology and structure. The reasonability of definition on fine roots of Metasequoia glyptostroboides was discussed which could improve fine root studies in the future. We determined fine root anatomical structures and root mycorrhizal colonization with different orders in M. glyptostroboides plantation and explored the relationship between fine root morphology and anatomy. We found: firstly, it was more reasonable to classify the roots by root order, and 1,2 level roots were defined as fine roots; secondly,1,2 level roots were those ones with intact epidermis, thicker and multi-layered cortex, and 3, 4 level roots were skinless roots or only a small amount of residual epidermal cells, with root orders increased, roots cortex layers and epidermis thickness became significantly lower; thirdly, with the root order increasing, the degree of cork periderm was significantly increased, vascular tissue development was gradually improved, the diameter of the vascular tissue and the ratio of vascular tissue to root diameter(V/R)was increasing with root order increase. There were significant correlation(except root level)between fine root diameter and vascular tissue diameter, but there was no correlation between fine root diameter and the cortical parenchyma cells diameter or cortical layers; fourthly,the mycorrhizal colonization in 1-3 order roots could be observed, and with root order increase, the mycorrhizal colonization rate was significantly decreased. There were obvious differences in fungal infestation area of single individual root with different order. In the future study, we should combine fine root morphology investigation and anatomy characteristics to investigate the correspondence between the root order and root diameter, and then determine the division of the range of fine roots
温度对兰州鲇消化酶活性的影响
杨元昊,,吉红,,杨娟宁,李维平
动物学杂志 , 2006,
Abstract:
虚拟现实技术结合作业疗法对痉挛型偏瘫脑瘫患儿上肢功能康复的影响
,张惠佳,罗卫红,郭春光,平秋,,谭亚琼
- , 2016,
Abstract: 目的观察虚拟现实(VR)技术结合作业疗法对痉挛型偏瘫脑瘫患儿上肢功能康复的影响。 方法将38例痉挛型偏瘫脑瘫患儿按随机数字表法分为治疗组和对照组,治疗组18人,对照组20人。2组患儿患侧上肢均接受常规作业治疗,治疗组在此基础上辅以VR技术治疗,每次30min,每周6次,共3月。治疗前、治疗3个月后(治疗后)对2组患儿进行评定,采用peabody运动发育量表-2(PDMS-2)中的精细运动发育商(FMQ)、Caroll手功能评定量表和日常生活活动(ADL)量表对2组患儿的上肢功能进行评定。 结果治疗前,2组患儿间FMQ、患手Caroll手功能和ADL评分间比较,差异统计学意义(P>0.05)。治疗后,2组患儿FMQ、患手Caroll手功能和ADL评分均较组内治疗前改善,差异有统计学意义(P<0.05)。与对照组治疗后比较,治疗组FMQ[(79.65±4.10)分]、患手Caroll手功能[(25.65±8.41)分]和ADL评分[(47.25±5.50)分]较为优异,差异有统计学意义(P<0.05)。 结论VR技术联合作业训练较单一作业训练治疗痉挛型偏瘫患儿的疗效好,可更好地改善患肢上肢功能和ADL能力。
Objective To observe the effect of combining virtual reality technology with occupational therapy in treating children with spastic hemiplegia resulting from cerebral palsy. MethodsThirty-eight spastic and hemiplegic children with cerebral palsy were randomly divided into a treatment group (n=18) and a control group (n=20). Both groups received occupational therapy, while the treatment group was additionally provided with virtual reality-based treatment. The sessions lasted 30 min, 6 times a week for 3 months. Before and after the treatment the upper extremity motor function of both groups was assessed using the fine motor quotients of the Peabody developmental motor scale, the Caroll hand function scale and a activities of daily life scale. ResultsBefore the treatment there was no significant difference between the two groups in terms of any of the measurements. After the 3 months, significant improvement was observed in both groups, but the improvement of the treatment group was significantly greater than that of the control group. ConclusionVirtual reality technology can further improve the motor function of the upper extremities and ability in the activities of daily life beyond that achievable through occupational therapy alone
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