两种物理加工方式对西洋参加工副产物粉体性质的影响

为明确西洋参加工副产物粉体的适宜加工方式,扩大西洋参加工副产物粉体在食品与保健品加工中的应用范围,丰富西洋参产品种类,分别采用蒸汽爆破、超微粉碎两种物理加工方式处理西洋参加工副产物粉体,评价其物理指标和营养指标,以期为生产西洋参片剂、粉剂、胶囊剂等产品提供一定的理论参考。结果表明：超微西洋参粉体与对照和汽爆相比色泽保持效果好,休止角小,比表面积大,可满足加工成片剂和胶囊剂的需求,也适宜作为功能性食品原料吸附或包裹于食品表面;其膨胀力大,持油力强,有利于吸附肠道中的脂类,适合加工为固体饮料。汽爆西洋参粉体滑动角小,堆积密度大,吸湿率小,更利于压片成型以及产品的短期保存;同时,汽爆西洋参粉体粗多糖含量大幅度增加,是对照粗多糖的4.107倍,更适合加工成功能性固体饮料。     

豌豆根瘤侵染细胞发育中造粉体的研究

透射电镜研究表明,在豌豆根瘤侵染细胞发育过程中,造粉体的形态结构处在变化之中.在发育早期,造粉体较多,分布在细胞壁附近.它的基质很少,多含有呈长梭形的、电子密度非常低的淀粉粒,并有一些电子密度较高的条带结构.随着细胞的发育,造粉体逐渐移至胞间隙周围,不断变小,切面近似椭圆形或圆形.进一步发育时,造粉体中的淀粉粒越     

粉碎粒度对笋衣营养成分及特性的影响

将笋衣粉碎成3种不同粒径的粉体,研究粉碎粒度对笋衣营养成分及特性的影响。结果表明,随着粒径的减小,粉体粗纤维含量降低(p0.05);粗蛋白质、粗脂肪和灰分含量差异不大(p0.05);色差和堆积密度减小(p0.05);滑角、溶解度和阳离子交换能力增大(p0.05);休止角、吸湿率、膨胀力、持水力和持油力增加;粉体颗粒微观结构发生变化。相对营养成分而言,粉碎粒度对笋衣特性影响较大。     

上海细创粉体装备有限公司

<正>(原上海化工机械三厂)化工部定点粉体加工研究中心上海市粉体工程中试基地上海化工机械三厂是研制粉体设备的专业厂商,行业标准制定单位,产品十几次荣获国家级、部级、上海市科技进步奖和新产品奖,是国内最大粉碎机专业制造厂家,能承接各种物料的试验和测试并提供成套设备,研制成功国内第一条粉碎在线检测自动控制系统,规模实力相当     

两种超微粉碎方法对香菇柄粉体性质的影响

为了改善香菇柄的粉体性质,采用机械碾轧和球磨粉碎两种方法对香菇柄进行超微处理,并对其理化性质及微观结构进行比较研究。结果表明：香菇柄经过两种超微粉碎方法处理后,粉体色泽变差,粒径显著降低,堆密度、流动性、水溶性指数、持水力、持油力、膨胀力、营养成分含量均有不同程度提高,特别是可溶性膳食纤维含量增加明显;与机械碾轧超微粉碎相比,球磨粉碎制得的微粉粒度更小更均一,堆密度、休止角、滑角、水溶性指数、持水力、持油力和膨胀力增加幅度更大。因此,两种超微处理方法都能显著改善香菇柄的粉体性质,其中球磨粉碎法处理的效果更好。     

纳米TiO2光催化降解苹果和洋李中毒死蜱残留的效果研究

为了利用光催化降解剂降低甚至消除农产品的农药残留,解决食品安全问题。本研究以水果中的有机磷农药残留为研究对象,探索了纳米TiO2粉体和水凝胶对苹果和洋李中毒死蜱残留的光催化降解效果。结果表明：二者均能很好的降解苹果和洋李中的毒死蜱残留,TiO2水凝胶的光催化效果稍优于纳米TiO2粉体。纳米TiO2本身无毒,光催化活性高,作为光催化降解剂在降低或消除农产品中的有机磷农药残留这一领域具有广阔的发展前景。     

我国大型“交钥匙”微纳米粉体工程在杭开建

日前，由国家重点高新技术企业浙江丰利粉碎设备有限公司总投资1．5亿元，在杭州国家高新技术产业开发区设立的“杭州丰利粉体工程有限公司”动工兴建。预计一期工程将于2008年底竣工。该基地的建成，将成为我国最大的粉体产品研发中心、测试中心、试验中心。[第一段]     

蓖麻籽直筒式压榨侧向压力系数的理论研究

为建立蓖麻籽直筒式压榨侧向压力系数的理论公式,以便于合理地确定直筒式压榨机的榨筒参数,通过进行蓖麻籽直筒式单轴压榨试验,获取蓖麻籽压榨坯密度、侧向应力和轴向应力。试验建立的压榨坯密度与轴向应力的关系曲线和金属粉体压制曲线近似,由此利用金属粉体压制公式进行数据拟合,同时利用试验数据建立了侧向压力系数与轴向应力关系曲线。理论公式计算值与试验实测值的最大相对误差为24.74%,平均误差7.56%,证明了基于压榨塑性模型推导过程建立的侧向压力系数理论模型能较好地描述蓖麻籽侧向压力系数变化。     

超微脱脂米糠粉物化特性的研究

采用超微粉碎机对脱脂米糠进行超微化处理,制备超微脱脂米糠粉。采用离心机、黏度仪等设备研究超微脱脂米糠粉的物化特性。结果表明,超微化后随着脱脂米糠粉粒度减小,其持水力、吸油性、溶解性和水分蒸发速率都增大,粉体流动性变小;随着米糠粉体粒度的减小,其吸湿性各指标都随之增大;3种米糠的临界相对湿度分别为83.1%,84.2%,85.0%;超微脱脂米糠粉溶液黏度随着粉体粒度的减小和溶液温度的升高而减小,随着溶液浓度的增加而增加;而pH值对黏度影响较小。     

绿豆淀粉粉体综合性能的研究

本实验旨在尝试利用现代高分子材料科学的研究方法和手段,了解绿豆淀粉的粉体性能,同时初步探讨了微观形态和宏观粉体性能的相关性。实验结果表明,不同筛目的绿豆淀粉的分散度(D)s随着筛目数的增加而逐渐增加;绿豆淀粉的松装密度(P)a随着筛目数的增加而逐渐的增加;绿豆淀粉的振实密度(P)p随筛目数的增加而增加;绿豆淀粉在甲苯作溶剂时所测的粒径(D)比较大。     

Study on the Projects of the Daily Regulation of Jinghong Hydroelectric Station on Lancang River

The one dimension mathematical model has been adopted to study the projects of the daily regulation of hydroelectric station: the implicit format of Preissmann has been adopted to solve the equation.The program of one dimension unsteady flow has been worked out.The result of calculation of the program has been verified by the result of the physical model and the coincide well.Under 4 kinds of projects of the daily regulation of Jinghong Hydroelectric Station,the unsteady flow conditions in lower reaches of the dam with the length of about 85km have been calculated by the program.The graph has been adopted to analyze the important characteristic parameters of the unstable flow conditions of 4 kinds of projects: the range of water level per day,the range of water level per hours and the range of water level per 20 minutes.Finally,the project of the daily regulation of Jinghong Hydroelectric Station which has a smallest influence on the navigable flow conditions has been obtained.     

农村土地流转中政府职能优化的策略审视

规范和促进农村土地流转是当前新农村建设的重要内容之一。当前,农村土地流转存在着缺乏有效的规范、土地流转中存在着侵权现象、随意改变流转土地的农业用途等问题。为此,应当优化政府培育土地流转市场的职能,农村土地流转中政府的政策制定职能,政府对农村土地流转程序的规范职能,政府对土地流转相关配套措施的完善职能。     

乌兰布和沙漠流动沙丘风沙流结构的定量研究

为研究乌兰布和沙漠流动沙区0~50 cm风沙流结构,揭示流动沙区风沙流的运动规律,在对乌兰布和沙漠流动沙丘风沙流实测的基础上,运用拟合曲线和拟合方程等方法对0~50 cm垂直高度内的风沙流结构进行分析。结果表明：（1）0~50 cm总输沙量与各高度层的输沙量与风速均呈幂函数关系。（2）各高度层输沙量与高度呈指数递减关系。（3）上、中、下3层的输沙量均与总输沙呈幂函数递增关系。     

A new boundary treatment of lattice boltzmann method (LBM) for fully developed pressure-driven periodic incompressible fluid flow

This paper proposeds a new boundary treatment of Lattice Boltzmann Method (LBM) for fully developed pressure-driven periodic incompressible fluid flow. The pressure gradient, instead of equivalent body force, is applied to determine the particle distribution function on the periodic traverse sections for the fully developed pressure-driven periodic flow. Numerical simulations, including 2D pressure-driven poiseuille flow and fluid flow passing periodic square obstacles, are carried out using this new boundary treatment. Simulation results show that the proposed approach not only overcomes the nonphysical inlet and outlet flow disturbances (which the LBM simulation always suffers from using the existing pressure boundary methods), but also preserves the system periodicity and generates consistent pressure distribution with macroscopic periodic boundary conditions for the pressure-driven incompressible fluid flow.     

农村土地流转的理论审视与现实路径解析

促进和规范农村土地流转是当前农村全面小康社会建设和新农村建设的重要内容之一。当前,应积极进行农村土地流转的理论分析,促进农村土地流转的法制化,完善政府的引导、管理和服务职能,积极建立和完善农村土地流转机制,建立健全农村社会保障体系。     

A New Heuristic Evolutionary Programming and Its Application in Solution of the Optimal Power Flow

A new algorithm,based on the combination of the evolutionary programming with the traditional gradient adjustment technique,is presented for solving the optimal power flow problem which describes some technical problems(representations of candidate solutions,evaluation function,mutation operator).Its efficiency is higher than that of general evolutionary programming.     

Product Quality Meta Data Secretive

The authors reveal the certain secretive attribute that quality meta data has,quality meta data secretive to the customer and enterprise's different function and the different expectation,introduce the Dublin core resources set concept,define quality meta data by 6 essential factor constitution method,and distinguish application example that constitute of the standard 6 essential factors.They propose application method and the data flow in view of quality meta data secretive attribute,divide the quality meta data into 3 big types,namely defects meta data,manufacture meta data and function meta data with the premise of the secretive attribute being respected,plan the quality meta data sharing principle and the data transmission flow.     

Experiments and Numerical Simulation of Flow Distribution with Larger Flux in Multi-branch Pipe

Many heating process with smoking gas involves the uniformity problem of flow distribution with larger flux in multi-branch pipe. The authors do the experiments and numerical simulation of flow distribution with larger flux in multi-branch pipe, which gets flow regulation in distributing pipe and the methods to improve flow distribution uniformly. Experiments have shown that improving the frame of distributing pipe may realize the flow distribution uniformly to the pipe with larger flux and multi-branch.     

The yield pattern considering the distance to flow accumulation lines

Precision agriculture techniques imply a spatial management of fields and to do so a good understanding of the spatial and temporal variability of yield is needed. Average yield data from seven irrigated maize fields were used to study the yield pattern considering the distance of plants to flow accumulation lines. It was found that there is a significant correlation between average yield and distance to flow accumulation lines (DFL). This correlation is best represented by a polynomial function. The most common shape of the yield pattern curve considering the distance to flow accumulation lines shows that there is an increase in average yield with DFL from 0 to 12.5–17.5 m. Near the flow lines the average yield presents lower values due to drainage problems causing plant growth problems. It was also observed higher yield variability near the flow lines. For higher distances from the flow lines there is a continuous decrease in average yield due to less water availability and other variations of soil properties.