集中力作用下考虑剪切滑移效应的双层结合面组合梁解析解

为了分析碳纤维-钢-混凝土组合梁在竖向集中荷载作用下的静力响应,基于弹性力学的经典理论,推导了竖向集中力作用下的双层结合面组合梁的解析解,得到了碳纤维-钢-混凝土双层结合面组合梁的挠曲线方程,并通过具体算例与有无相互作用的组合梁计算结果进行了对比,结果表明该解析解是正确的、合理的,为工程设计人员提供了一种可靠的设计计算方法,具有较强的实际应用价值。

组合-混合梁结合段传力机理研究

为研究大跨度组合-混合梁斜拉桥结合段的传力机理,以主跨为580 m的富龙西江大桥为例,对中腹板区域进行1∶2缩尺模型试验和有限元模型分析,研究组合梁截面各参数对结合段轴向力传递路径的影响规律。研究结果表明:组合梁-混凝土梁结合段中传递轴向力的部件为结合段混凝土、桥面板及各类埋入钢板上的剪力连接件;承压交界面上的承压板、桥面板与剪力件群传递轴向力占比分别是32.2%、45.0%、22.8%;增大桥面板厚度,可有效提升桥面板的传力占比,并减少承压板传力占比,而增大组合梁顶钢板厚度能提高剪力件群的传力占比,减小桥面板传力占比;承压板较薄时,增大承压板厚度,可增大承压板的传力占比,减小桥面板及剪力连接件的传力比,但承压板厚度达到一定数值后,增加承压板厚度不会改变各部分传递的轴力占比。

组合式外固定支架结合有限内固定术治疗创伤性胫骨骨折的效果探讨

目的:探讨用组合式外固定支架结合有限内固定术治疗创伤性胫骨骨折的效果。方法:将河北省丰宁县中医院2017年1月至2018年12月收治的创伤性胫骨骨折患者100例作为研究对象。将其随机分为内-外组和比较组(50例/组)。为内-外组患者应用组合式外固定支架结合有限内固定术进行治疗,为比较组患者应用交锁髓内钉内固定术进行治疗。然后比较两组患者的临床疗效。结果:内-外组患者治疗的优良率〔84%(42/50)〕高于比较组患者治疗的优良率〔64%(32/50)〕,P<0.05。治疗后,内-外组患者创面愈合的时间〔(36.17±1.43)d〕、骨折愈合的时间〔(3.79±1.06)个月〕均短于比较组患者创面愈合的时间〔(45.37±2.88)d〕、骨折愈合的时间〔(4.91±1.62)个月〕,P<0.05。结论:用组合式外固定支架结合有限内固定术治疗创伤性胫骨骨折可取得良好的疗效。

结构组合对沥青混凝土路面行驶质量的影响

路面使用性能有功能性能和结构性能之分,而功能性能又包含行驶质量和安全性两方面的内容。主要研究路面行驶质量及其发展变化规律。

碳酸司维拉姆联合组合型血液净化治疗维持性血液透析患者高磷血症的安全性及有效性分析

探讨碳酸司维拉姆结合组合型血液净化用于血透期间高磷血症患者的预后效果。方法:高磷血症合并血液透析病患共70例,收治于2019年2月到2020年3月。采用随机量表进行分组。常规组不采取特殊干预方案。实验组应用碳酸司维拉姆结合组合型血液净化。对比两组患者症状缓解率血磷、血钙、磷钙乘积以及用药安全性指标。结果:实验组高磷血症的缓解率显著高于常规组,P<0.05;在干预后实验组患者的血磷、血钙以及钙磷乘积指标均显著优于常规组,P<0.05;实验组患者的尿素氮、肌酐以及β2微球蛋白指标明显优于常规组,P<0.05;实验组患者的用药安全性明显高于常规组,P<0.05。结论:碳酸司维拉姆结合组合型血液净化方案可以有效应用于维持性血液透析患者,对于患者的高磷症状具备显著改善效果,有利于患者的整体预后,值得普及。

浅谈小学语文“读写结合”的教学策略

随着课程改革进程地深入演进,对学生的综合学习素养提出了更高的要求,也对教师的教学技能和业务能力提出了新的挑战, 小学语文读写结合教学是结合着小学生的认知习惯和学习目标采取的灵活的教学方法,有利于增强对学生的教育关怀,提高学生的语 文学科修养和语文学习积极性。这需要教师在语文教学实践中重视读写结合,思考读写结合教学的有效方法,在阅读和写作综合训练 中全面提高学生的语文听说读写技巧和能力。本文通过研究读写结合教学的重要价值,并结合笔者的教学实践,就如何有效开展读写 结合教学提出几点粗浅的的建议。

混凝土-CA砂浆复合试件界面端奇异应力场消除方法研究

为研究混凝土-CA砂浆双材料界面端的应力场奇异性,建立混凝土-CA砂浆双材料复合试件轴拉计算模型,并对界面拉应力分布进行分析。基于Bogy特征方程,提出消除混凝土-CA砂浆复合试件界面端奇异性的方法。研究结果表明:混凝土与CA砂浆界面端附近存在应力奇异现象,该应力奇异现象使得界面端点处的应力明显增加。当结合角组合θ1=θ2≤72°时,混凝土-CA砂浆界面端的应力奇异性消失,此时应力场为一定值。研究成果可为精确的双材料界面黏结强度试验提供理论依据。

应收款项减值测试方法探析

实务中对应收款项减值测试方法存在争议。本文首先分析了采用单项和组合相结合测试、仅采用单项测试,两种方法的法理基础;然后分析了应收款项减值测试方法在国务院国资委所属企业、公开发行证券的上市公司的实际应用情况,得出了对应收款项进行减值测试应同时采用单项和组合相结合的测试方法,而不能仅采用单项测试;最后提出了应收款项减值测试方法在财务报表附注中披露的参考模板建议。

Distribution of Polychaete Assemblage in Relation to Natural Environmental Variation and Anthropogenic Stress

Polychaete are diverse species of the soft-bottom community, and are often used as indicators in environment monitoring programs. However, the effects of anthropogenic activities and natural environmental variation on polychaete assemblage are rarely addressed. The goals of this study are to identify the effects of natural environmental variation and anthropogenic stress on poly- chaete assemblage, and to explore the relationship between the polychaete assemblage structure and anthropogenic stress without considering the natural environmental variation. Based on the data collected from the surveys conducted in the tidal fiat of Jiaozhou Bay, the relationship between polychaete assemblage structure and environmental variables was determined using multivariate statis- tical methods including hierarchical cluster analysis, multidimensional scaling （MDS） and canonical correspondence analysis （CCA）. The results showed that the polychaete assemblage was dominated by two species, Amphictenejaponica and Heteromastusfiliformis, and could be divided into two subgroups characterized by high and low species abundance. CCA illustrated that the natural environ- mental variables including water temperature and the distance from coast had primary effects on the polychaete assemblage structure; while stress of contaminants, such as As and Hg, had the secondary influences; and stress from the aquacultured species, mainly Ruditapes philippinarum, had a limited effect. Colinearity between the natural environmental variables and anthropogenic stress variables caused a critical divergence in the interpretation of CCA results, which highlighted the risk of a lack of information in en- vironment assessment. Glycinde gurjanovae, Sternaspis scutata and Eulalia bilineata may serve as the ＇contamination indicators＇, which need to be confirmed in future studies.

基于标准化的公路简支钢桁梁桥设计创新与应用

沾淄高速沿线跨河跨渠部分大跨径桥梁采用下承式简支钢桁梁,跨径布置有96 m、108 m和130 m三种,横向布置有三片桁和四片桁两种。现介绍了该项目的总体布置和结构设计,归纳总结了基于标准化设计和制造的公路简支钢桁梁桥设计难点和技术创新,可为今后同类桥梁设计提供参考。

Analysis on Breeding Potential of 17 Maize Inbred Lines from Land Races

[Objective] The primary objective of this study was to estimate combining ability and genetic parameters of 17 new inbred lines.[Method] By using 11 commonly used maize inbred lines from Southwest China as testers and incomplete diallel cross design,combining ability and heterosis of 17 new inbred lines bred from the land races in Sichuan Basin and its surrounding areas were analyzed.In addition,the genetic parameters and heterotic groups were also investigated based on combining ability.[Result] P1-1,P1-16 and P1-14 with the better comprehensive characters can be directly used in maize breeding program.The SCA of P1-10×P2-4 was high in most traits.It is more possible to obtain high-yield hybrid combinations by the pattern Sipingtou × Lancaster.GCA variance was bigger than SCA variance in four traits such as rows per ear,grains per row,which were affected by the environments slightly and should be selected at early generations;while SCA variance was bigger than GCA variance in five traits such as 100-grain weight and plant weight,which were significantly influenced by environment and thus should be selected in later generations.[Conclusion] The paper will provide theoretical basis for further improvement of local maize varieties.

现代名优白酒市场营销策略选择的研究

市场是白酒企业得以生存的根本保障,成功开发市场,不断扩大市场份额,提高市场占有率是白酒企业得以发展的前提和基础。白酒市场营销策略是占有市场的基础,市场营销策略决定着企业的兴衰成败,白酒企业在实施市场营销的过程中,必须采取科学全面的营销策略。

Interfacial microstructure and mechanical behavior of Mg/Cu bimetal composites fabricated by compound casting process

Mg/Cu bimetal composites were prepared by compound casting method, and the microstructure evolution, phase constitution and bonding strength at the interface were investigated.It is found that a good metallurgical bonding can be achieved at the interface of Mg and Cu,which consists of two sub-layers,i.e.,layer I with 30μm on the copper side composed of Mg2Cu matrix phase, on which a small amount of dendritic MgCu2 phase was randomly distributed;layerⅡ with 140μm on the magnesium side made up of the lamellar nano-eutectic network Mg2Cu+(Mg) and a small amount of detached Mg2Cu phase. The average interfacial shear strength of the bimetal composite is measured to be 13 MPa.This study provides a new fabrication process for the application of Mg/Cu bimetal composites as the hydrogen storage materials.

Some Notes on the Dual Leibniz-Hopf algebra

The Leibniz-Hopf algebra is the free associative algebra with one generator in each positive degree and coproduct given by the Cartan formula. Quasi-symmetric functions are a generalisation of symmetric functions [7],and the algebra of quasi-symmetric functions appear as the dual of the Leibniz-Hopf algebra. The Leibniz-Hopf algebra and its dual are word Hopf algebras and play an important role in combinatorics, algebra and topology. We give some properties of words and consider an another view of proof for the antipode in the dual Leibniz-Hopf algebra.

System of Combined Foundation for Tall Buildings

Location of the heavily loaded building on the ground of the small load capacity requires application of the appropriate foundation structure. The required foundation system is most often deep, it is expensive and its cost increases significantly when the building is located in earthquake area or in mining damage sector. The proposed structural system of the combined foundation makes possible to design and to construct a very stable and relative inexpensive foundation structure, which can obtain an extremely large horizontal surface and which can be placed not deeply beneath the terrain level. It can be a very solid support structure for a tall building placed on very weak subsoil and at the same time located in seismic area. This system can be applied not only for new buildings but it can be used for the existing buildings and moreover for straighten of the inclined objects. Due to special arrangement of component parts the combined foundation possesses inherent features of a vibration damper, what is highly desirable if buildings have to be located in earthquake areas. When the aboveground storeys structure has some similar patterns with structural form of the combined foundation then the structural system of the whole building obtains coherent structural characteristics and it is called the combined structural system of the tall building. Suitable application of this system makes possible to design high-rise buildings having interesting and unique architectonic forms, what is presented on a selected example.

浅析江津观音岩长江大桥的技术研究方向

江津观音岩长江大桥是交通部第一座最大、桥面最宽的结合梁斜拉桥,在工程立项、设计、工程监控、健康安全咨询和施工过程中关键技术与专项课题研究,涵盖了六个子课题专项技术科研。

UPLC-LTQ-Orbitrap快速鉴定丹参川芎嗪注射液中化学成分

目的：采用超高效液相结合二维线性离子阱静电轨道阱组合式高分辨质谱（UPLC-LTQ-Orbitrap）对丹参川芎嗪注射液化学成分进行快速分析和鉴别。方法：采用ACQUITY UPLC BEH C18色谱柱（2.1 mm×50 mm,1.7μm）,以乙腈-0.1%甲酸水为流动相进行梯度洗脱,流速300μL·min-1,进样量5μL。质谱条件为电喷雾离子源（ESI）,负离子模式下检测,质量扫描范围m/z 100～1 000。结果：从丹参川芎嗪注射液中共鉴别出15个化学成分。结论：UPLC-LTQ-Orbitrap方法能快速鉴别丹参川芎嗪注射液中的化学成分,为丹参川芎嗪注射液的药效物质研究奠定基础。

Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity

Investigating the microstructures and properties of gradient materials has been regarded as a promising way to accelerate the identification of optimal compositions for applications. Herein, a supergravity method is applied to prepare the graded entropic alloys Al-Zn-Li-Mg-Cu. Through carefully optimizing the experimental conditions, the graded microstructures and hardness values appear after the supergravity technique. The morphology of the alloy significantly changes from the bulk intermetallics to eutectic structures along the supergravity force direction, which results from the crushed and graded aluminum oxide combined with the extremelystrong force. The results show that with this supergravity method, a performance-enhanced alloy can potentially be achieved through the centrifugation in a short time span and thus it paves the way for designing and synthesizing entropic alloys with intriguing properties.

Multi-component hydrogen-bonding salts formed between imidazole and aromatic acids:Synthons cooperation and crystal structures

Imidazole base was crystallized with different aromatic carboxylic acids 2,4-dihydroxybenzoic acid, 5-chlorosalicylic acid, and 1,8-naphthalic acid, affording three new binary molecular organic salts of [(C 3 H 5 N 2 + )·(C 7 H 5 O 4 )] (1), [(C 3 H 5 N 2 + )·(C 7 H 4 O 3 Cl )] C 7 H 5 O 3 Cl (2), and [(C 3 H 5 N 2 + ) (C 12 H 7 O 4 )] (3). Proton transfer occurs from the COOH of carboxylic acid to nitrogen of imidazole in all complexes (1-3), leading to the hydrogen bond N-H…O in all structures. To our knowledge, the recognition pattern between the carboxylic acid group and imidazole (acid-imidazole synthon) is less well-studied so far. The cooperation among COOH, COO and imidazolium cation functional groups for the observed hydrogen bond synthons is examined in the three structures. Generally, the strong N-H…O and O-H…O hydrogen bonds define supramolecular architecture and connectivity within chains, while weaker C-H…O hydrogen bonds play the dominant role in controlling the interactions between layers in these novel organic salts. Thermal stability of these compounds has been investigated by thermogravimetric analysis (TGA) of mass loss.

Quantum transport in topological insulator hybrid structures-A combination of topological insulator and superconductor

In this paper,a brief review of the history of topological insulators is given.After that,electronic transport experiments in topological insulator-superconductor hybrid structures,including experimental methods,physical properties and seemingly contradictory observations are discussed.Additionally,some new topological insulator hybrid structures are proposed.