Development and Application of Computer Aided Roll Design System for Thread-steel-bar

Roll pass design is one of the important content of making the rolling technology of section steel.The traditional pass design relies mainly on artificial experience,which brings some tedious calculation and great consumption of raw materials.In order to improve production efficiency,the constitute and the design methods of the roll system for thread-steel-bar are analyzed during stretching,further rolling and finished rolling.The mathematical models and the(experience) formulas used for the roll design in the past are revised.The computer aided roll design system is developed for thread-steelbar based on the structural means of compiling program.The authors adopt Visual Basic6.0 as a visual program tool,and combine the basic design theory of the thread-steel-bar's roll and the practical experience.The system can shorten the design cycle of the new product development,and reduce the energy consumption of the rolling mill and the distribution of production.     

药渣及秸秆替代基质中草炭进行烤烟漂浮育苗研究初报

用堆捂腐熟的药渣和玉米秸秆完全替代烤烟漂浮育苗基质中的草炭,形成9个基质配方。通过与成品商用基质进行对比育苗试验,开展了用腐熟药渣和玉米秸替代草炭作烟草漂浮育苗基质的可行性研究。结果表明：用药渣和腐熟玉米秸来代替草炭作烤烟漂浮育苗基质是完全可行的;粗药渣60%+细药渣20%+珍珠岩20%和细药渣60%+腐熟玉米秸20%+珍珠岩20%的二个替代处理的综合育苗性能与对照最为接近,基本具备了作为烤烟漂浮育苗基质的条件,所育烟苗均能达到壮苗标准要求,但烟苗地上部分和地下部分的协调程度还不及对照,这一点需要进一步的研究加以改进。     

配方均匀设计法优化挤压膨化物料配比

利用均匀设计软件生成的15种原料配比对其营养成分、膨化度和糊化度进行分析研究,以确定挤压膨化的最佳进料比。结果表明,豆粕中含有丰富的蛋白质,但其淀粉含量非常低,与小米和大麦恰好相反,配比7中蛋白质含量稍低;15种原料配比的膨化度和糊化度比较分析得出配比1优于其他配比。综合以上因素,选取原料的配比为8∶1∶1作为小米、大麦和豆粕复合挤压膨化的进料比。     

杂粮加工中参数设置对挤压特性的影响

加工谷物早餐时,挤压膨化影响产品的感官评价、膨化度、糊化度的因素是多方面的,研究了原料成分、挤压膨化操作参数等因素的影响,主要考察物料含水量、机筒温度、螺杆转速、进料速度等参数对产品的影响。以膨化度、糊化度为考察目标进行了试验,最终确定最佳挤压工艺参数为:物料含水量16%,机筒温度设置为第3组,5个区温度分别为:80,90,110,130,165℃,螺杆转速为140r/min,进料速度为30r/min。     

高粱挤压膨化工艺条件的研究

在单因素试验基础上,采用响应面分析法研究挤压工艺条件对高粱仁膨化特性的影响。结果表明,回归方程能较好地预测高粱膨化度随挤压工艺参数变化的规律,高粱挤压膨化的最佳工艺条件是:物料含水量25.5%,物料粒度60目,转速300 r/min,膨化温度164℃,膨化度3.22。     

Application of at Algorithm in Shoe Last Deformation Design

Deformation design is main content of shoe last CAD system. This paper introduces adaptive tangency (AT) algorithm, which is used to calculate the sectional curve when a known plane section shoe last under a discrete model, and describes its application in shoe last deformation design. Shoe last data can be converted each other in shoe last deformation design, which ensures data format standardized in whole CAD procedure. The detailed algorithm in deformation design is fulfilled and an actual example is given, which shows AT algorithm's application is successful.     

The Study on Intelligent Experimental System of Bio-soft Tissue

According to the especial mechanical properties of bio-soft tissue materials, we design a mechanical test system of bio-soft tissue moterials which is controlled by microcomputer and can execute the post-processing for bio-soft tissue materials. The system can solve better the problems of reliability and accuracy appearing in the test of the mechanical properties for bio-soft tissue materials,and the test is convenient as well as speedy,and provides an effective experimental means for the study of biomechanics.     

大豆蛋白质塑料研究进展

近年来,农业可再生材料受到人们的重视,蛋白质是可生物降解的环境友好材料。以不同农作物蛋白质来源分别介绍了国内外蛋白质塑料的研究进展,主要有大豆蛋白质及其他豆类蛋白质,涉及蛋白质材料的增塑、交联、共混等改性方法和压缩、挤出、注射等成型方法。     

全谷玉米系列食品的生产方法研究

以玉米为原料,进行了全谷玉米系列食品的生产方法研究,采用多级粉碎技术对玉米进行皮粉分离,经微细粉碎及挤压膨化工艺处理,显著提高了全谷玉米产品水溶性膳食纤维的含量,改善了产品的口感和风味。     

Ceratotropis亚属基于SSR标记和ITS序列的分类与进化分析

利用SSR分子标记和ITS序列分析研究Ceratotropis亚属已鉴定的93份种质以及Vigna亚属的2份地方种和Glycine属的1份野生种,共8个种及亚种的96份材料的遗传差异。初步筛选出分布于11个连锁群(linkage group, LG)的74对小豆引物及14对黒吉豆引物和第9连锁群的5对绿豆引物,得到分辨力强的27对引物,平均PIC值为0.4914;UPGMA聚类分析,在DICE系数0.021处,将95份参试材料(除HAI_103)划分为两大类,第I类包括Ceratotropis组所有种质和3个“过渡”种质,第II类包括Angulares组所有种质;且小豆引物通用性最高：23对小豆引物的转移能力达88%以上。对参试材料中的28份典型种质进行ITS测序分析,比较序列间Kimura进化距离发现,V. minima和 V. umbellata种间距离最小(0~0.005),V. radiata种内分化程度最高;利用MEGA4.0构建最大简约树(maximum parsimony, MP)和邻接树(neighbor-joining, NJ),将参试种质划分为3大类,这与形态学和SSR标记分类一致。     

Section Optimization Design of Steel-Concrete Continuous Composite Beams Based on the Finite Element Method

This paper introduces the efficient computer aided design method to optimize the section of steel-concrete continuous composite beams by combining FEM for structure analysis with optimization arithmetic and an efficient shearing force link model of steel-concrete composite beams.The authors established a finite element analysis model,optimization parameter model,optimization mathematics model of steel-concrete continuous composite beams and programs analysis file and optimization control file by using the ANSYS parameter design language. The optimum of the steel-concrete continuous composite beams section is obtained after computing and the optimization result indicates that this method is efficient in optimizing the section of steel-concrete continuous composite beams.So it could be applied extensively in the steel-concrete continuous composite beams section optimization design.     

Axial Bearing Capacity Design Method of Cold-Formed Steel Quadruple-C Built-up Section Members

The finite element model involving geometric large deformation,materials and contact nonlinearity is established.Specimens of cold-formed steel quadruple-C built-up section members are simulated and the finite element models are proved to be valid.Then,numerical analysis on the behavior of specimens with different slenderness ratio and flange flakiness ratio are carried out,and then the axial bearing capacities of specimens are obtained.Based on effective width method and direct strength method (DSM) in related codes,two design methods of cold-formed steel quadruple-C built-up section members under axial compression are proposed:effective length method and correction factor method.It is shown that:the final failure characteristics of all specimens are local buckling and distortional buckling.In the case of not considering the reduction of effective length,the results calculated by each code are slightly lower than those of test and FEM when the slenderness ratio is less than 50,while the results are too conservative when the slenderness ratio is more than 50.     

Phenotypic evaluation of floral and flowering traits with relevance for hybrid breeding in wheat (Triticum aestivum L.)

Hybrid breeding is a promising approach to increase the yield potential in wheat (Triticum aestivum L.). The profitability of wheat hybrids highly depends on a cost‐efficient system for hybrid seed production for which an adequate outcrossing in the male pool is of utmost importance. Employing a set of 51 elite winter wheat lines, we developed and evaluated phenotyping methods for floral and flowering traits with relevance for improved cross‐pollination. We observed significant genotypic variances and high heritabilities for most traits, including important traits like pollen mass and anther extrusion. Our results suggest the utility of the developed phenotyping approaches for applied plant breeding and the potential of the traits to assist in the design of the male ideotype for increased cross‐fertilization.     

四川康定地区仙桃采后商品化处理

以四川康定地区大渡河流域仙桃为考察对象,针对该流域仙桃在流通过程中出现的失水、腐烂或碰撞挤压等问题进行了大量的实地研究,介绍了康定仙桃采后商品化处理技术,包括果实的采收、清洗、分级、包装、冷链技术等重要环节,同时提出完善仙桃商品化处理的策略,为四川康定仙桃采后商品化处理相关措施的出台提供借鉴。     

Small scale wind tunnel for high pressure and high energy discharge

A kind of small scale wind tunnel with low velocity is proposed according to the characteristics of strong ionization discharge chamber and the demands of discharge for flux, velocity and flow fields. On the precondition that the airflow field and velocity is satisfied, aerodynamic design and structural design are carried out. Key techniques are studied including overall structure, aerodynamic and structural design of airflow vent and collection vent, aerodynamic and structural design of power section, flow rate adjustment and control, and cooling system of motor. Based on the design scheme, a small scale wind tunnel with strong ionization discharge for an enterprise is developed. Application indicates that the small scale wind tunnel is a practical and effective airflow loop device for high pressure and strong ionization discharge with the features of stability and reliability.     

挤压膨化处理麸皮对全麦粉品质的影响

将红麦、白麦、加麦的小麦麸皮经挤压膨化处理、粉碎后,按原配比回添到面粉中,制得全麦粉。通过与未处理小麦麸皮回添的全麦粉在理化指标和流变学特性对比来评判2种工艺制得的全麦粉的性质,从色度、面筋、蛋白、沉降值、粉质、拉伸等方面进行比较,挤压膨化处理麸皮回添工艺对全麦粉的品质有明显的改变。     

Temperature Effect Analysis of Chongqing Shibanpo Yangtze River Double Line Bridge

Thermal stress is one of the important influence factors of crack and deformation for large-span bridge structures. Grounded on Shibanpo Yangtze River double line bridge and universal finite element program MIDAS-Civil with referring to specifications of China and British BS5400, above all, it is for this Bridge that the stress and deformation influence is studied by setting section temperature difference and system temperature change, afterwards, the effect on the newborn bridge is discussed by combining impact of the section temperature difference and the system-calefaction linearly , and then, the effect is compared with the impact brought by moving load. The results will have a certain extent value for the design of ShiBanpo double line bridge and other similar bridges.     

Energy-absorbing Properties and Crushing Flow Stress Equation of Lightweight Foamed Concrete

Lightweight foamed concrete is a new arresting material for arresting overrun aircraft. To reveal its compression properties and mechanism of deformation and destruction, a study on lightweight foamed concrete with different density, 0.21 and 0.31 g/cm 3 respectively, has been carried out. Experiment system include CSS4410 electronic universal testing machine and Dynatup9250 drop-hammer testing machine and VHS8800 high strain rate system. Then, extrusion strength under different indenter area is predicted with a theoretical model, and a crushing flow stress constitutive equation is proposed. The results show that it is characterized by the movement of crushing driving interface during the process of deformation, crush to compaction of the material, and the deformation is notably in local. The compression strength is relevant to density and impact velocity. Moreover, theoretical model can predict the extrusion strength under different indenter area exactly, and the crushing flow stress equation can describe mechanic properties of compression well.     

陕西棉花抗枯黄萎病种质资源评价

摘 要：通过病圃连续选择杂种世代材料,育成的陕棉抗病种质对棉花枯、黄萎病具有较高的抗性,同时丰产、优质是中国棉花育种初始抗源之一。陕4、陕5、陕401、陕5245、陕1155等抗病种质被多家育种单位应用,具陕棉遗传背景的品种有晋7、冀14、86-1、川56、苏5、新陆中3号、中17、中19、中23、中35、中41等抗病品种60余个,陕棉抗病种质及其衍生品种累计在中国种植0.2亿公顷,有效地控制了棉花枯、黄萎病在中国的蔓延,起到防病增产作用。陕棉抗病种质作为抗源,具有较高的应用价值。