Discussion on Second-order Analysis of Variable-Section Beam-Column

In this paper, based on the discussion of orthogonal decomposition method for the buckling mode of unsymmetrical structure, taking the variable-section beam-column as an example, a simple and direct method of the second order analysis is presented. In the new method, the conception of enlargement coefficient brought forward by Timoshenko is developed. To begin with the curvature of the variable-section beam-column, the linear equations are set up. With their solution, a group of orthogonal buckling mode can be obtained. The primary deflection can be decomposed to a group of homomorphic deflection similar to buckling mode. Then, the group of deflection is multiplied by corresponding enlargement coefficient and plus the result, finally, the second-order total deflection can be obtained.     

立地管理措施对二代2年生杉木林生长影响

在福建省南平峡阳国有林场一片 2 9年生一代杉木人工林采伐迹地上 ,开展 5种不同立地管理措施对第 2代杉木人工林影响的研究 ,结果表明 ,BL3 BM0 (收获树干和树皮、加倍采伐剩余物 )处理方式对 2年生 2代杉木林的造林成活率和生长最为有利 ,其次为 BL0 BM0 (收获地上所有有机质 )处理 ,BL1BM0 (清走树木的所有部分 )处理生长最慢 ;BL2 BM1(收获树干和树皮、炼山 )处理造林成活率最低 ;炼山处理 ( BL2 BM1)与保留相同数量采伐剩余物而不炼山的处理( BL2 BM0 )相比 ,杉木生生长和成活率没有显著差异     

湖南省洞口县第二例牛尿素中毒诊治报告

1前言湖南省洞口县第二例牛尿素中毒,制做了简易竹洞针,进行左赚部套洞针(竹洞针)穿刺术放气,灌入食醋,葡萄糖输液等抢救和治疗方案。牛场存栏328头,239头中毒,发病率72.9%,治疗239头,治愈216头,治愈率90.4%,较首例牛尿素中毒病例治愈率100%,降低9.6个百分点,瘤胃膨气病病牛128头,治愈105头,治愈率82.0%,较洞口县首例牛尿素中毒病例治愈率100%,下降18.0个百分点;并对牛瘤胃膨气病最佳抢救时间和尿素养牛正确用量用法进行了探索,供同行参考。     

桑椹菌核病菌实时荧光定量PCR检测体系的建立和应用

为及时高效地鉴别桑椹菌核病的病原菌桑实杯盘菌Ciboria shiraiana和肉阜状杯盘菌C. carunculoides,根据RPB2基因序列设计引物并验证其特异性,建立这2种病原菌的实时荧光定量PCR(real-time fluorescent quantitative PCR,q PCR)检测体系,运用该体系对抗、感果桑品种不同时间点芽(果)内的2种病原菌进行检测。结果表明,设计的2对引物特异性强,qPCR检测灵敏度均为10^-4ng/μL,均为常规PCR灵敏度的10~5倍,建立的桑实杯盘菌和肉阜状杯盘菌qPCR标准曲线的扩增效率分别为104.89%和95.30%。利用所建方法成功从采集的果桑样品中检测出病原菌主要为肉阜状杯盘菌,且感病品种中肉阜状杯盘菌的含量随着时间不断增加,在将要显症时激增。表明所建qPCR体系适用于桑椹菌核病早期无症状芽(果)的检测,可通过监测其病原菌类型和含量为该病害的预测预报及早期防治提供依据。     

Calcium Signaling is Involved in Negative Phototropism ofRice Seminal Roots简

Calcium ions(Ca2+) act as an intracellular second messenger and affect nearly all aspects of cellular life. They are functioned by interacting with polar auxin transport, and the negative phototropism of plant roots is caused by the transport of auxin from the irradiated side to the shaded side of the roots. To clarify the role of calcium signaling in the modulation of rice root negative phototropism, as well as the relationship between polar auxin transport and calcium signaling, calcium signaling reagents were used to treat rice seminal roots which were cultivated in hydroculture and unilaterally illuminated at an intensity of 100–200 μmol/(m2·s) for 24 h. Negative phototropism curvature and growth rate of rice roots were both promoted by exogenous CaCl2 lower than 100 μmol/L, but inhibited by calcium channel blockers(verapamil and LaCl3), calcineurin inhibitor(chlorpromazine, CPZ), and polar auxin transport inhibitor(N-1-naphthylphthalamic acid, NPA). Roots stopped growing and negative phototropism disappeared when the concentrations increased to 100 μmol/L verapamil, 12.500 μmol/L LaCl3, 60 μmol/L CPZ, and 6 μmol/L NPA. Moreover, 100 μmol/L CaCl2 could relieve the inhibition of LaCl3, verapamil and NPA. The enhanced negative phototropism curvature was caused by the transportation of more auxin from the irradiated side to the shaded side in the presence of exogenous Ca2+. Calcium signaling plays a key role as a second messenger in the process of light signal regulation of rice root growth and negative phototropism.     

考虑地基刚度的底部两层框架砖房自振周期的计算

提出了一个考虑地基刚度并结合下柔上刚的结构特征，把一栋建筑物作为一个整体建立相应的力学模型，最后得到一个计算此类结构自振周期的实用计算方法。     

LB空间上的纲性定理

给出了局部凸空间是第二纲空间的一个必要条件 ,证明了( LB)空间 (它是不可赋范的 ,完备的桶式空间 )是第一纲空间 ,进而回答了桶式空间中是否有第一纲空间和不可赋范的局部凸空间 X的强对偶 X* 是否一定不可距离化的问题     

重视语言教与学中的“情感过滤”

本文在简要论述什么是第二语言习得及二语习得理论对语言教师实践的重要意义的基 础上，着重探讨了二语习得中情感因素的研究成果，特别是“情感过滤”现象的存在对外语教与学的启示。     

二语词汇习得的认知观

认知理论把第二语言习得看作是一种复杂的认知技能的习得,是一种心理和智力的过程,是对外界输入的语言材料进行加工、存储、输出的过程。词汇习得是单词音形义的习得,认知论从认知主、客体两大方面来考察词汇习得机制。文中围绕二语习得的认知过程,分别从图式理论、概念整合理论、信息加工理论等方面对第二语言词汇习得的认知理论进行了探讨,旨在为第二语言教学和词汇习得研究提供理论参考。     

小黑麦牧草产量与品质对施氮的响应

研究了施氮对不同刈割时期小黑麦中饲237 Triticale cereale cv. Zhongsi 237的饲草产量及营养成分的影响.结果表明:施氮和刈割时期对中饲237的草产量均有明显的影响,施氮可显著改善刈割后中饲237的再生性,促进植株生长,提高二茬鲜草、干草产量,且差异达极显著水平,同时可提高饲草的粗蛋白、粗脂肪、氨基酸含量,降低粗纤维含量,改善饲草品质.起身期刈割的处理,其二茬草的草产量、粗蛋白、粗脂肪产量均高于拔节期刈割的处理.追施氮肥处理的粗蛋白含量及产量均大于未追施氮肥的处理,而中性洗涤纤维、酸性洗涤纤维含量小于未追氮肥的处理.