海相淤泥特性水泥土搅拌桩强度影响因素及其变化规律的试验研究

基于目前的地基处理技术和施工设备,研究海相淤泥特性水泥土搅拌桩的物理力学性质。通过对海相淤泥特性水泥土搅拌桩桩身强度影响因素的综合分析,找出各种影响因素与桩身强度存在的影响规律,并根据实验数据分析归纳出本次实验用土场地的海相淤泥特性水泥土搅拌桩的物理力学性质指标公式。这些物理力学性质指标公式,无论对海相淤泥特性水泥土搅拌桩设计理论,还是对海相淤泥特性水泥土搅拌桩工程设计及施工指导都具有重要的理论意义和工程应用价值。     

氨棉包芯纱的力学性能

对氨棉包芯纱的力学性能进行了测试,分析了影响包芯纱强力、弹性的因素,并根据氨纶和棉纱的力学性能预测了包芯纱的强力,预测值和实测值较为一致.     

三组分花式线的强伸性能预测与分析

为了研究三组分花式线的力学性能,对其强力的构成进行理论预测和试验分析,从花式线组成出发,分析了三组分花式线的结构和影响因素;然后通过拉伸应力-应变曲线,对常见三组分花式线进行了强伸性能的测定;最后,对3种三组分花式线的强力进行了理论预测和试验分析。结子线的强伸性能有较大差别;圈圈线的强伸性能主要由芯纱决定;氨纶包缠纱由氨纶提供弹性,由包缠在氨纶外侧的非弹性纱决定纱线的强力。     

未起绒1:3衬垫针织物的线圈几何结构性能

本文的目的主要是讨论未起绒1∶3衬垫针织物的线圈几何结构性能。文中先提出了一个把机号、纱支、地纱和衬垫线线圈长度、以及它们之间的比值等因素进行综合考虑的实验计划,然后分析讨论这些因素在洗涤松弛状态下对织物纵横向密度以及平方米克重的影响;同时还对这种组织结构进行了一定的理论分析,以便得到更精确的计算公式。实验结果和理论分析表明,地纱线圈长度是影响织物线圈几何尺寸的主要因素,这对实际生产有一定的指导意义。     

加捻对热致液晶聚芳酯初生纤维拉伸性能的影响

热致液晶聚芳酯(TLCP)的特殊化学结构使其具有高强度、高模量、低粘度、易加工等诸多优良特性,且TLCP纤维力学性能对其应用于纺织业具有举足轻重的作用。本论文主要研究加捻对TLCP纤维力学性能的影响,探究其影响机理。研究结果表明:加捻对其力学性能影响很大,TLCP纤维束的强力随着捻度的增加呈先增大后减小趋势。当TLCP纤维束的线密度为52.50 tex,捻度为130Tm时,最大强度为9.14 cN/dtex。未加捻TLCP单纤维的线密度为1.394 tex时,最大强度为11.3cN/dtex。     

下卧碎石层对静压管桩挤土效应的影响

利用通用有限元软件ABAQUS分析软土地基下卧碎石层对静压管桩挤土效应和承载力的影响,并探讨管桩不同贯入深度时地表竖向隆起、地基土体水平位移、桩周土体和桩身应力的变化规律.结果表明:静压管桩施工导致桩周附近地表隆起,随着离开桩周的距离增大,地表隆起效应迅速减弱;静压管桩使桩周土体产生显著的水平挤压效应,静压管桩施工至下卧碎石层时,碎石区域中的位移效应明显小于桩周土体为软土时的位移效应;以碎石层为持力层,可显著提高管桩的承载力.     

TENSILE BEHAVIOUR OF ROTOR SPUN YARNS

This paper deals with the tensile behaviour of rotor spun yarns. Having regard to the spe-cial construction of rotor spun yarn, some modifications for Hearle's theory have been made inorder to apply Hearle' s theory to rotor spun yarn. The paper then goes into calculating thetensile curve and investigating the effect of main parameters and spinning conditions on thetensile behaviour of rotor spun yarn. It was found that the following facts are noteworthy forimproving the mechanical properties of rotor spun yarn: (1) Selecting suitable navel so as tocontrol the P. T. E. length within a reasonable range. (2) Improving the design of single fibresupply device to decrease the amount of spoiled fibre and hence increase the effective fibrelength. (3) Increasing spinning yarn tension without yarn break to enhance the fibre migrationratio. (4) For the rotor spun yarn of industrial use, it is the way to increase the yarn strengththat the rotor groove should be designed with the groove angle beneficial to decrease the yarnspecific volume.     

低桩承台重力式码头地震响应分析

为探究不同刚度低桩承台结构重力式码头地震响应规律,首先利用ABAQUS建立了某重力式码头的精细化有限元模型,其次改变低桩承台结构的桩数、桩径及混凝土强度等级,来获取不同低桩承台的刚度,最后输入三向空间地震动,以此探究低桩承台重力式码头随低桩承台刚度变化的地震响应规律。分析表明:当桩-承台结构刚度改变时,结构整体水平位移随桩径增大而减小、随混凝土强度增大而增大、随桩数增加而增大;结构峰值加速度随桩数增加而增大、随桩径增大而减小;桩侧动土压力远大于码头后动土压力,桩侧动土压力随桩数增加而增大、随桩径增大而增大、随混凝土强度等级提高而减小。     

螯合分散剂在亚麻粗纱煮练中的作用

亚麻织物以其优良的服装性能，深受广大消费者青睐．但传统的煮练工艺对亚麻纱的强力损伤大，纱线柔软性差．本文首先在理论上分析研究了传统煮练工艺对亚麻纱强力损伤的机理及用柔软剂和螯合分散剂保护纱线强力的机理．然后采用实验对比分析的方法，研究探讨了上述两种助剂的用量对亚麻纱性能的影响．实验结果表明，在亚麻粗纱煮练工艺中使用柔软剂和螯合分散剂，可以提高亚麻纱的柔软性和可纺性，进而使其强力得到提高，但若加入过多的柔软剂，反而使细纱平均强度下降，强度不匀情况恶化．     

加捻对芳纶纱线强伸性能的影响

加捻对芳纶纤维的强伸性能的影响已有人作过研究,并指出,捻度对芳纶纤维的强伸性能十分敏感。本文主要通过实验时芳纶单纱和胶线的强伸性能各指标之间的关系进行了比较系统的研究,并获得芳纶单纱,股线的最佳捻度配置范围。     

Physical Characteristics of Knitted Polyester Vascular Prostheses： Can the Wall Be Considered as a Scaffold for Tissue Regeneration？

Recent developments in endovascular surgery (EVAR) have opened new avenues to successfully treat aneurysms with percutaneous deployment of stent-grafts.Manufacturers have preferred to use woven fabrics or micro-porous tubes which are supported by metallic frames or stents.Woven fabrics are much thinner than knits and this permits the use of a smaller delivery catheter.However,since woven constructions are stiffer and have little porosity,the tissue ingrowth is poor or absent.On the other hand,knitted constructions can be considered as a scaffold for tissue ingrowth,and hence they represent an attractive alternative because of their open structure and better conformability in the case of balloon deployment.The present study was undertaken to analyze the properties of two knitted and crimped polyester arterial prototype prostheses,one with and the other without a gelatin coating as sealant.Two commercial controls were also included in the study,namely the uncoated knitted polyester vascular prosthesis VP1200K,and its sealed version,the gelatin coated polyester knitted Gelsoft device,manufactured by Vascutek Ltd.,Scotland,UK.In vitro testing consisted of analyzing the geometry and morphology of the yarn and fabric structures,and measuring the physical and mechanical properties of the grafts,including the water permeability,the longitudinal and radial compliance,and the suture retention strength.In order to compare the different properties of the four samples,tests were also performed on the gelatin coated or sealed devices before and after gelatin removal.The results provided a useful comparison between the prototypes and the commercial control devices.The latter used ten times the amount of gelatin which had been applied as a coating in order to achieve the same low level of impermeability to water.The different amounts of gelatin also explained the different mechanical performance,such as compliance,for these prototype and control prostheses.     

单针床氨纶弹力经编毛圈织物的探讨

单针床氨纶弹力经编毛圈织物的编织，至少要使用三把梳栉。机后两把流栉为地梳栉，机前一把梳栉为毛圈梳栉，并且氨纶弹性纱线应穿在后梳栉上。地组织必须采用针后移针与毛圈沉降片横移同向的经平组织，毛圈组织应采用编链组织。     

粉煤灰对聚烯烃胶粘带防腐层的补强性能研究

分析了济宁地区粉煤灰的外观形貌和化学组成，并用于聚烯烃胶粘带防腐层补强性能研究，着重研究了粉煤灰添加量对聚烯烃胶粘带防腐层力学性能的影响。实验结果表明：粉煤灰中的化学成分以 SiO₂、Al₂O₃、 Fe₂O₃为主，三者总质量分数高达88.04%，CaO的质量分数为12.40%，此粉煤灰属于碱性灰；粉煤灰中有少量非晶态玻璃体的存在，主要晶体矿物是石英、莫来石和赤铁矿；添加粉煤灰后，聚烯烃胶粘带防腐层的力学性能得到提升；当粉煤灰添加量为15份时，试验品的力学性能最优，拉伸强度91.93 N/cm、断裂伸长率536.67%、剥离强度33.43 N/cm；煤粉灰是一种优良的填充剂，可以代替碳酸钙用于聚烯烃胶粘带防腐层的生产。此研究不仅能提高粉煤灰的利用率和附加值，改善聚烯烃胶粘带防腐层的各项性能，还能为工业粉煤灰在橡胶补强方面的产业化应用提供理论依据。     

Effect of Blending Ratio on Properties of Core Yarn and Fabric of Polysulfonamide(PSA)/Flame Retardant Viscose(FRV)/Conductive Filament

In order to develop a fabric with excellent flame resistance function, antistatic function, moisture absorption and breathability, the polysulfonamide(PSA) fiber and the flame retardant viscose(FRV) fiber were blended. Meanwhile, the conductive filaments were used as the core yarn, and then they were made into the core-spun yarn and the fabric at different blending ratios of PSA/FRV. The effects of the blending ratio of PSA/FRV on the mechanical properties and the evenness of the yarn were studied. The effects of the blending ratio of PSA/FRV on mechanical properties, flame retardant properties, antistatic properties, moisture permeability and drape of the fabric were analyzed. With the increase of the blending ratios of PSA/FRV, the strength and the elongation of the core-spun yarn increased firstly and then decreased. Moreover, the evenness of the core-spun yarn was improved, the fabric strength increased firstly and then decreased, the flame resistance decreased, and the antistatic performance improved. These results provide an important basis for the preparation and wide application of fabrics made of PSA/FRV/conductive filament.     

Analysis on the Characterization of the Twist Insertion Level and Its Effect of the Compact and Ring Spun Yarns

In this paper,the difference of the twist insertion levels of the compact and ring span yarns of the same count is analyzed based on the relationship of the yarn twist factor to the twist angle and the bulk density.It is proposed that the relationship of the twist angle,twist level,and the yarn diameter should be synthetically considered when evaluating the twist insertion level of the compact yarn.The twist angle of the compact yarn is smaller than that of the ring yarn with the same twist insertion level.This results from the ordered fiber arrangement and compact structure of the compact yarn.Experiment was conducted to verify the conclusions.It is also discovered that the selection of the twist factor of the compact yarn,which can be usually lower than that of the ring yarn by 10％-15％,can be determined based on the yarn tensile strength.     

粉煤灰对聚烯烃胶粘带防腐层的补强性能研究

分析了济宁地区粉煤灰的外观形貌和化学组成，并用于聚烯烃胶粘带防腐层补强性能研究，着重研究了粉煤灰添加量对聚烯烃胶粘带防腐层力学性能的影响。实验结果表明：粉煤灰中的化学成分以 SiO₂、Al₂O₃、 Fe₂O₃为主，三者总质量分数高达88.04%，CaO的质量分数为12.40%，此粉煤灰属于碱性灰；粉煤灰中有少量非晶态玻璃体的存在，主要晶体矿物是石英、莫来石和赤铁矿；添加粉煤灰后，聚烯烃胶粘带防腐层的力学性能得到提升；当粉煤灰添加量为15份时，试验品的力学性能最优，拉伸强度91.93 N/cm、断裂伸长率536.67%、剥离强度33.43 N/cm；煤粉灰是一种优良的填充剂，可以代替碳酸钙用于聚烯烃胶粘带防腐层的生产。此研究不仅能提高粉煤灰的利用率和附加值，改善聚烯烃胶粘带防腐层的各项性能，还能为工业粉煤灰在橡胶补强方面的产业化应用提供理论依据。     

Manufacturing of Ultra-high Molecular Weight Polyethylene Fiber Reinforced Tape and the Loss of Strength

Due to the low density and excellent mechanical proper-ties,high performance fiber reinforced materials have aconsiderable application in the area of high technologyand dally usage.In this paper,the Ultra-high Molecu-lar Weight Polyethylene(UHMWPE)fiber reinforcedPE tape prepared with the method of powder impregnat-ion was studied.The effect of impregnate length and thetensile force of the yarn on the fiber content as well as on the strength and modulus of the tape were discussed.Calculation shows that the strength and the modulus ofthe ULMWPE fiber can keep about 85％ after it undergothe process.     

Prediction of Rotor Spun Yarn Strength Using Adaptive Neuro-fuzzy Inference System and Linear Multiple Regression Methods

This paper presents a comparison study of two models for predicting the strength of rotor spun cotton yarns from fiber properties. The adaptive neuro-fuzzy system inference （ANFIS） and Multiple Linear Regression models are used to predict the rotor spun yarn strength. Fiber properties and yam count are used as inputs to train the two models and the count-strength-product （CSP） was the targel. The predictive performances of the two models are estimated and compared. We found that the ANFIS has a better predictive power in comparison with linear multiple regression model. The impact of each fiber property is also illustrated.     

温度荷载影响下能源桩受力特性分析

能源桩作为一种新型桩基础形式,通过将换热管材埋于桩中与周围岩土体进行热交换,其承载特性受温度-荷载共同作用而不同于常规桩。有限的现场原位试验测试数据不足以全面的反应能源桩在不同约束条件下的承载性能;因此高效而准确的数值模拟方法的应用,将为能源桩受力特性的分析带来极大的便利。基于理想弹塑性桩-土荷载传递准则,应用数值模拟的方式对能源桩受力特性进行了分析;通过改变桩顶及桩端约束、桩周土体强度、上部结构荷载情况,调查了能源桩在温度荷载作用下的轴向应力,桩侧摩阻力及桩-土相对滑动位移等的变化,以期加深对能源桩受力特性规律的认识。     

Effect Of Construction On Some Mechanical Properties of Non - finished and Finished Cotton Fabrics

The analysis of fabrics of different woven constructions made of the same count of yarn indicates different wrinkle recovery and other mechanical properties before and after wrinkle resistant treatment. For the plain weave fabrics, parameters of the warp threads and weft threads can influence the effect of wrinkle resistance finishing. When the parameters of warp threads are similar as that of the weft threads, the even - structure can be obtained . Therefore, the best wrinkle recovery angle can be obtained. With the increasing of warp threads and weft threads, the strength of non - finished and finished fabrics can be increased. When the warp threads are similar as the weft threads, high strength retain can also be obtained.