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The innovations of the thesis have been shown in several aspects as follows: put forward the transfer mechanism model of the landslide thrust on basis of the soil arching theory, and according to the model the formula about how to compute the thrust acting on the pile and the maximum pile spacing have been deduced. Set up the displacement model about the interaction of the pile and landslide, and their relatively displacement can be taken into consideration when computing the pile, thus the limitation of supposing the distribution of landslide thrust has been avoided, at the same time, the applied condition of the model and the computing procedure have been given. Bring forward the improved computing method of the anti-sliding pile with prestressed cable, which has been verified rational and applicable, making the method more perfectly in theory. Through the study on the mechanical model of the foundation beam with prestressed cable, put up the limit design idea of the structure, and the realization procedure of the idea has been given and programmed with the finite element, which leads to a new thinking for the safe and rational design of the foundation beam with prestressed anchor cable.
本论文的创新之处在于,用土拱理论建立了滑坡推力在抗滑桩与坡体之间的传递机制模型,并由此得到了作用于抗滑桩上的滑坡推力计算式以及最大桩间距的确定条件式;建立了抗滑桩与滑坡体相互作用的位移模型,该模型能考虑桩与坡体相互作用过程中二者相对位移的影响,避免了人为假设滑坡推力分布形式的缺陷,给出了其适用条件和计算过程;提出了预应力锚索抗滑桩的改进计算方法,使得预应力锚索抗滑桩的计算理论更加完善,通过实例验证了该方法的适用性和合理性;在预应力锚索地梁力学计算模型研究的基础上,提出了预应力锚索地梁极限状态设计的新思想,给出了该设计方法的实现途径并编制了有限元计算程序,为锚索地梁合理而安全的设计提供了一种新思路。
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From the point of view of structure,bamboo cell wall ratio,amount of bundle per unit area,fraction of bundle sheath,fraction of vessel increase from the root to the top of the bamboo,while fractionof parenchyma.Single bundle sheath area decreases with the increase of height.Fiber length,fiber width and vessel length increase from the root to the top andget theirs maximum value at the length of 17th node to 23rd node and thendecrease.Fiber length and width ratio slightly decreases while vessel widthincreases with the increase of height.
从构造角度来说,竹材胞壁率、单位面积维管束个数、纤维束比量、输导组织比量从基部到到梢部随着高度增加而增加,而薄壁组织比量、单个维管束纤维束面积随着高度增加而减小;纤维长度、纤维宽度、导管长度从基部到梢部随着高度的增加而增加,在第17竹节到第23竹节达到最大值,而后下降,纤维长宽比随着高度的增加而缓慢下降,导管宽度随着高度增加而一直增加。
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From 6860 to 3170 cal.yr BP,semi-desert steppeexpanded,regional montane forest steppe retreated,suggesting a prolonged warm and dryclimate.Between 3170 and 2340 cal.yr BP,regional forest steppe expanded whereassemi-desert steppe retreated,indicating the climate became cool and wet gradually and thehumidity reached the maximum at the end of this stage.During 2340~1600 cal.yr BP,Poaceae steppe dominated whereas wetland meadow expanded and the montane forest stepperetreated,suggesting a cool and wet climate prevailed,wormwood grass steppe prevailed andthe climatic instability increased after 1600 cal.a BEThe climate and environmental reconstructions by pollen were supported by the diatomrecords.A relative high lake level and moister climate prevailed between 8660 and 7230 cal.yr BP as inferred by the dominance of planktonic diatom genera and high planktonic/benthicratio (〉40).low lake level and dry climate sustained during 7230~2330 cal.yr BP assuggested by the low abundance of planktonic diatom and low planktonic/benthic ratio ~20and the lake returned to high level during 2330~930 cal.yr BP as inferred by there-dominance of the planktonic diatom and the high value of palnktonic/benthic ratio.The pollen-based climate reconstruction was also consolidated by the grain size andPediastrum concentration records.
Ugii Nuur湖周围现代孢粉研究表明:松属为空气传播的外来花粉,其含量变化可能指示了远山森林草原发育状况;禾本科具显著低代表性,母体植物建群时含量通常在10%以下:藜科花粉含量可以指示区域气候干旱程度。2、以现代孢粉研究为基础、可靠AMS~(14)C年代为框架,Ugii Nuur孢粉记录高分辨率地重建了蒙古国中部地区过去8660 cal.yr BP以来的植被和气候变化。8660~7800 cal.yr BP研究区植被为禾草草原,湖畔及河谷低地发育苔草草甸,远山发育松属针叶林和森林草原,气候温和略湿润;其中8350~8250 cal.yr BP湿生草甸扩张,旱生植物成分减少,气候凉湿。7800~6860 cal.yr BP旱生成分增加,气候转向暖干。6860~3170 cal.yrBP半荒漠草原扩张,远山森林草原退缩,山地草原和河谷及湖畔湿生草甸退缩,气候持续暖干。3170~2340 cal.yr BP半荒漠草原退缩,远山森林草原扩张,气候转凉变湿,末期湿度条件达最佳。2340~1600 cal.yr BP禾草草原发育,湖畔及河谷低地湿生草甸扩张,远山森林草原略有退缩,气候总体较凉湿。1600 cal.yr BP以来研究区发育禾草-冷蒿草原,气候波动较大。
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When the bottom plate side syndiospecific lower than a sizzling, drawing pressure ball left, paper will go on there which would in turn low-speed machines brace will receive the same fault because plate following fulcrun is the eccentric shaft, corrected, you can add the eccentric shaft, convex to reverse some of the panels to fan-shaped with a sizzling plane are equal to the maximum State, low-speed machines la along two concave iron support, you can set the concave iron spare, Planer to some, is equal to the thickness to brace the distance below the iron plate plane, the installation at a later time.
当侧规底部扇形不活矮于铁不活立体时,不推纸压球压下去此后,纸弛不离会出不隐凹下下去不隐象,矮速机的不推条也会出不隐同样的障碍,因为扇形不活底下的支点是公道小轴,在校侧时,可以不兵公道小轴的凸背回旋一些,调度到扇形不活背同铁不活立体不等为最好状况,矮速机的不推条是由二块凹形铁撑持,可以不兵凹形铁拆上去,用刨床刨去一些,刨去的厚度即是不推条矮于铁不活立体的间隔,安设此后再举不静调度。
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The results were as follows the airdried density ( moisture content of wood is 12%), the basic density and the ovendry density were 0.583 g·cm-3, 0.462 g·cm-3 and 0.507 g·cm-3 respectively, the airdried density was at the medium level in domestic wood species;the shrinkage coefficient of radial, tangential and volumetric were 0.099%, 0.183% and 0.296% respectively, the maximum swelling were 4.106%, 7.958% and 12.627% respectively;the ratio of tangential shrinkages to radial shrinkages was 1.5-1.9;the toughness was 52.12 kJ·m-2;the hardness of cross, radial and tangential section were 41.53 MPa, 31.41 MPa and 35.51 MPa respectively;the compressive strength parallel to grain was 44.50 MPa ;the modulus of elasticity in static bending and the bending strength were 12.63GPa and 127.31 MPa respectively;the shearing strength parallel to grain of radial and tangential were 8.76 MPa and 10.54 MPa respectively;the cleavage strength to grain of radial and tangential were 124.3 N·mm-1 and 138.6 N·mm-1 respectively.
结果表明大叶栎木材的气干密度(含水率为12%)、基本密度和全干密度分别为0.583 g·cm-3、0.462 g·cm-3和0.507 g·cm-3,气干密度属于国产木材的中等级水平;径向、弦向和体积干缩系数分别为0.099%、0.183%、0.296%,湿胀率依次为4.106%、7.958%和12.627%,差异干缩为1.5-1.9,其尺寸稳定性较好;冲击韧性为52.12 kJ·m-2,端面、径面和弦面硬度分别为41.53 MPa、31.41 MPa和35.51 MPa,顺纹抗压强度为44.50 MPa,抗弯弹性模量和抗弯强度分别为12.63 GPa和127.31 MPa,径面和弦面顺纹抗剪强度分别为8.76 MPa和10.54 MPa,抗劈强度依次为124.3 N·mm-1和138.6 N·mm-1。
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The results were as follows: the air-dried density(moisture content of wood is 12%),the basic density and the oven-dry density were 0.583 g·cm-3,0.462 g·cm-3 and 0.507 g·cm-3 respectively,the air-dried density was at the medium level in domestic wood species;the shrinkage coefficient of radial,tangential and volumetric were 0.099%,0.183% and 0.296% respectively,the maximum s...
结果表明:大叶栎木材的气干密度(含水率为12%)、基本密度和全干密度分别为0.583 g.cm-3、0.462 g.cm-3和0.507 g.cm-3,气干密度属于国产木材的中等级水平;径向、弦向和体积干缩系数分别为0.099%、0.183%、0.296%,湿胀率依次为4.106%、7.958%和12.627%,差异干缩为1.5-1.9,其尺寸稳定性较好;冲击韧性为52.12 kJ.m-2,端面、径面和弦面硬度分别为41.53 MPa、31.41 MPa和35.51 MPa,顺纹抗压强度为44.50 MPa,抗弯弹性模量和抗弯强度分别为12.63 GPa和127.31 MPa,径面和弦面顺纹抗剪强度分别为8.76 MPa和10.54MPa,抗劈强度依次为124.3 N.mm-1和138.6 N.mm-1。
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The paper involved two parts: Part 1: A two-chambered microbial fuel cell was constructed with high-concentration sodium acetate as fuel in the anode. The influence of different electron acceptors in the cathode, external resistance value, pH value and concentration of sodium acetate on electricity generation in MFC was investigated. The result showed that the maximum power density of 294.72 mW/m2 and the coulombic efficiency of 25.87% was achieved at sodium acetate concentration of 6.46 g/L, pH 7.0, external resistance 500Ωin the anode and when using potassium permanganate as electron acceptor in the cathode.
全文分为两个部分:第一部分:以乙酸钠为阳极原料构建双室微生物燃料电池,研究不同阴极受体、外接电阻、乙酸钠浓度和pH等因素对电池产电性能的影响,研究结果表明:在500mL的阴阳极反应体系中,选用乙酸钠作为阳极底物,质量浓度为6.46 g/L, pH 7.0,接入500Ω外电阻,阴极电子受体选择高锰酸钾的情况下,微生物燃料电池产电性能最好,最大电功率密度达到294.72 mW/m2,库伦效率能达到25.87%。
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During the New Moon (the 1st of a lunar month) and the Full Moon (the 15th of a lunar month) when the Earth, Moon, and Sun lie in a straight line, the solar and the lunar tides overlap and the sea-level pressure is lower than the mean at the Airport, because the tide-producing force induced by the Sun and Moon reaches maximum. On the other hand, during the First Quarter (the 7th day of a lunar month) and the Last Quarter (the 21st of a lunar month) the Sun-Earth's and the Moon-Earth's relative positions are perpendicular to each other with respect to Earth, the solar and the lunar tides interfere mutually, the Airport sea-level pressure is greater than the annual mean due to the tide-producing force reaching minimum.
松山机场在朔望月里,每逢阴历朔日或望日,受太阳与月球之引潮力(Tide-producing force)方向一致,太阳潮和太阴潮重叠影响,其全日和逐时平均海平面气压比年平均为低;而每逢上弦和下弦时,日地与月地的相对位置成直角,太阴潮和太阳潮相干扰,其全日和逐时平均海平面气压则比全年平均为高。
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The results indicate the mutual effect exists between the single coals, which could increase the maximum of thermal weight loss obviously and has a small effect on the temperature extent of the weight loss. The main pyrolysis production of coal is coke, but the main production of waste plastics is tar; the yield of water became decrease and the gas became increase by adding the waste plastics. And the CRI and CSR decreased with the ratio of waste plastics in coal. The main ingredients of tar from blend coal are aromatic hydrocarbon and alkane, while those of waste plastics are alkane and alkene. The result of co-coking with coal and waste plastics make the light tar and the aromatic hydrocarbon increase obviously. The combustible ingredient(CO、H2、CH4) of gas from co-coking with coal increase at different ratio; Co-coking with coal and waste plastics could increase the combustible ingredient and thermal value of gas.
结果表明,废塑料与煤混合物在煤的塑性温度区间内存在明显的相互作用,使最大热解失重峰迁移,热解速率变大,且随着废塑料配比的增加呈现规律性的变化;煤热解产物固体焦炭为主,而废塑料的热解产物以焦油为主,废塑料的添加使得总体焦炭和水产率下降,焦炉煤气和焦油的产率增加,即共焦化呈现出明显的&增油减水&效应;随着塑料添加量的增加,焦炭热强度呈现劣化趋势;废塑料代替瘦煤配煤炼焦可使其比例提高到3%而不影响焦炭的质量;纯煤焦化所得焦油以芳香烃类和烷烃类为主,而废塑料热解焦油以烷烃和烯烃为主;废塑料配煤炼焦,可使得的焦油呈现&环构化&和&轻质化&趋势;废塑料的添加可使煤气中的可燃组分(CO、H2、CH4)的含量均有不同程度的增加;废塑料配煤炼焦可以优化焦炉煤气的组成,增加煤气中的可燃组分,提高焦炉煤气的热值。
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On the basis of mechanics of materials and finite element method, the theoretical analysis, numeric simulation and imitative calculation were carried out on the stiffness of HSK tool system. Calculation formula of the turning angle-bending moment of HSK cutter shank was presented, basic law of the variation of stiffness of HSK tool system was revealed, thus provided the theoretical basis on reasonable employment of HSK tool system to develop its maximum benefit and at the same time possesses important theoretical significance and practical value for developing the new typed tool system of the independent knowledge property right of our country.
基于材料力学理论及有限元法对HSK工具系统刚度进行了理论分析和数值模拟及仿真计算,给出了HSK刀柄变形转角-弯矩的计算公式,揭示出HSK工具系统刚度变化的基本规律,为合理使用HSK工具系统,使其发挥最大效益提供了理论依据,同时对开发我国自主知识产权的新型工具系统具有重要的理论意义和实用价值。
- 推荐网络例句
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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.
曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。
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The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.
稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。
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When I was in school, the rabbi explained everythingin the Bible two different ways.
当我上学的时候,老师解释《圣经》用两种不同的方法。