玉米乳的加工工艺优化设计

对玉米乳饮料的工艺流程和方法进行阐述，采用正交试验、线性回归和分析比较法确定了玉米在７０℃下用０．４％Ｎａ２ＣＯ３溶液及液固比为３１的条件下浸泡３５ｍｉｎ，获得了最佳浸泡效果．确定了其它各单元操作的适宜工艺条件，并对玉米乳中的沉淀问题提出了相应的解决方法．     

原位VC颗粒弥散强化304不锈钢的组织与性能

为了改善奥氏体不锈钢的力学性能,采用原位铸造法制备出VC颗粒弥散强化304不锈钢基材料,并研究了VC颗粒的加入对304不锈钢的显微组织和性能的影响.研究结果表明,原位VC颗粒在铸态组织中呈现2种形貌:沿晶界呈长条状分布的颗粒和在晶内均匀分布的亚微米尺寸的等轴状颗粒.TEM结果表明,在热处理过程中有纳米尺寸的VC颗粒析出.原位合成VC颗粒的加入,使304不锈钢的室温及高温强度均得到显著提高,但在一定程度上降低了其塑性和冲击韧性.与母合金304不锈钢相比,采用原位合成工艺引入VC颗粒后,在温度为650℃、应力为100 MPa的条件下,强化钢的抗蠕变性能得到大幅度改善.     

面向制造的圆角特征选择性抑制识别的处理策略

为了最大程度地保留零件模型信息,提出了一种面向制造的圆角特征处理策略.该策略将圆角特征分为抑制类与非抑制类,并采用不同的处理方法.处理过程包括圆角特征识别与分类、圆角抑制与恢复2部分:根据刀具接近方向识别出所有主加工面,再以主加工面为基础向周围搜索识别圆角过渡面,然后分析过渡面信息进而确定圆角特征类型;对抑制类特征进行抑制,对抑制后的模型进行特征识别,完成之后恢复抑制的圆角特征,并还原三维模型的原始结构,对非抑制特征不做任何处理.该处理策略简化了圆角特征的抑制过程,最大程度地保留了三维模型的特征信息,提高了特征识别的整体效率与准确性.最后,利用实例验证了该模型的正确性.     

Process modeling and optimizing control based on sparse nonuniformly sampled data

<正> In this paper,a process modeling and related optimizing control for nonuniformly sampled ( NUS)systems are addressed.By using a proposed nonuniform integration filter and subspace method estimation,an identification method of NUS systems is developed,based on which either an output soft sensor or ahidden state estimator is developed.The optimizing control is implemented by replacing the sparsely-measured/immeasurable variable with the estimated one.Examples of optimizing control problem are given.The proposed optimizing control strategy in the simulation examples is verified to be very effective.     

东海银鲳个体生殖力的研究

本文研究了东海银鲳个体生殖力的分布以及个体生殖力与各体征指标的关系。结果表明：银鲳的个体绝对生殖力ｒ、相对生殖力ｒ／Ｌ（绝对生殖力／体长）、ｒ／ｗ（绝对生殖力／体重）均服从正态分布。个体绝对生殖力ｒ和相对生殖力ｒ／Ｌ与各度量指标均为幂函数关系，与各称量指标则为线性相关，而个体相对生殖力ｒ／ｗ除了与性腺重、成熟系数相关外，与其它体征指标均不相关。本文还进一步给出了个体生殖力ｒ、ｒ／Ｌ、ｒ／ｗ均值的９５％置信区间及个体生殖力ｒ与各指标的多元回纳方程。     

从语言习得角度评析儿童英语教材句法的适应度

本文以剑桥少儿英语教材为研究对象,结合转换生成语法理论与儿童二语习得顺序的研究成果,分析教材中语法尤其是句法习得的内容安排是否符合儿童的心理特点与语言习得规律。分析结果表明,儿童语言习得的特殊性在该系列少儿英语教材中没有得到应有的重视。     

延安地区山西组泥页岩岩相及沉积相特征

目前世界能源发展由化石能源向新能源转化,天然气作为清洁的化石能源是两者过渡最好的选择。鄂尔多斯盆地延安地区山西组地层是中国陆相页岩气勘探潜力较大的层系,近年来已经获得了巨大的勘探开发成果。为进一步加深对该地区的地质认识,以鄂尔多斯盆地延安地区山西组泥页岩为研究对象,综合应用野外露头、岩心、测井等资料,开展山西组岩石类型、岩相类型、沉积相展布研究。结果表明：延安地区山西组泥页岩主要发育泥质硅质页岩（S-3）、黏土岩（CM）、含钙/硅质黏土页岩(CM-1)、含钙/黏土质硅质混合页岩(M-2)四种岩相类型。页岩、粉砂质泥岩、碳质泥岩、细粒砂岩4种岩石类型。发育滨浅湖亚相、三角洲前缘亚相和前三角洲亚相,研究区水下分流河道砂体呈南北条带状发育。通过有机质成熟度（Ro）、有机碳含量（TOC）、暗色泥岩厚度将岩相进一步划分为3种类型,其中Ⅰ型岩相为油气勘探有利岩相,在山1段主要分布在延长东部地区、北部地区,山2段主要分布在甘泉下寺湾地区。     

Numerical Simulation of the Morphology and Moving Velocity for Electrospun Stable Jet

GAMBIT,POLYFLOW and FLUENT POST were used to simulate the morphology and the velocity of electrospun stable jet.Simulation results shows that jet diameter decreases with the increased draw force acted on the stable jet.But too great draw force would lead to thick knots appearing along the jet or stable jet disappearing during electrospinning.There is a linear relationship between the velocity and the moving distance.But the linear relationship does not exist under great draw force.     

基于组合赋权云模型的阻力伞保障风险评估

针对阻力伞保障风险指标体系不完善、风险管理不系统的问题,通过工作分解结构(work breakdown structure, WBS)-资源分解结构(resource breakdown structure, RBS)法兼顾工作流程和风险要素,建立清晰完善的阻力伞保障风险指标体系。采用组合赋权法融合不确定层次分析法(analytic hierarchy process, AHP)-集对分析的主观权重和CRITIC法(criteria importance though intercriteria correlation)的客观权重实现对风险指标的合理赋权,建立基于云模型的风险评估模型确定风险等级,引入雷达图直观地展示和等级并进行风险分析。研究结果对于实施风险控制、提升保障效率和确保飞行安全具有重要意义。     

Microstructure and properties of in-situ synthesized Cu-1 wt%TiC alloy followed by ECAP and post-annealing

A dispersion-strengthened copper alloy with 1 wt% TiC for commercial electrical-contact wires was prepared by in-situ reaction casting, grain-ultrafining by equal-channel angular pressing (ECAP) and subsequent annealing with aim to obtain excellent comprehensive performance. The results showed that fine TiC particles were in-situ synthesized in the as-cast Cu matrix and aggregated in clusters, and thus mechanical properties of the as-cast alloy deemed insufficient. Continued ECAP at 473 K significantly refined the grains of the as-cast alloy and improved the distribution of TiC particles. Due to multiple strengthening mechanisms, the ECAP-processed alloys maintained good conductivity with obviously enhanced tensile strength and hardness values. After post-ECAP annealing, the elongation and conductivity of the fine-grained copper alloy increased with the adequate tensile strength. The novel combined process endows the alloy appropriate performance to serve current high-frequency electrification railway systems.