应用双螺杆挤压机改性玉米蛋白质的研究

本文采用BC45型双螺杆挤压机,进行了玉米粗蛋白的挤压改性研究.通过分析蛋白质水溶性的变化,发现螺杆转速越快,物料水分越低,膨化温度越低,模头长度越短,越有利于获得高NSI的玉米蛋白.并用均匀试验设计优化了影响蛋白质溶解性的工艺条件;获得高NSI的最优挤压条件为:物料水分11%,螺杆转速160rpm,膨化温度75℃,模头长度300mm;各因素对玉米粗蛋白NSI的影响次序为:物料水分、膨化温度、模头长度、螺杆转速.蛋白质经过挤压膨化处理,可大大改善其功能性质指标,与此同时产品的色泽、气味也得以改善,消化利用率提高.     

挤压膨化对玉米蛋白肽得率影响的研究

采用挤压膨化的方法处理玉米蛋白粉,使玉米蛋白变性,探索提高玉米蛋白粉酶解后肽得率的挤压条件。以物料水分含量、挤压机机筒温度、挤压机螺杆转速、挤压机模孔孔径为考察因素,酶解后玉米蛋白肽得率为评价指标,采用五元二次正交旋转设计,建立回归方程,通过响应面分析方法,探索试验因素对评价指标的影响规律,确定最佳的挤压工艺条件。实验结果表明,机筒温度为78℃,螺杆转速为175r/min,模孔孔径为8mm,物料水分含量为24.5%的挤压条件下,酶解后肽得率达到74.02%。     

应用双螺杆挤压机改性玉米蛋白质的研究

本文采用BC45型双螺杆挤压机,进行了玉米粗蛋白的挤压改性研究。通过分析蛋白质水溶性的变化,发现螺杆转速越快,物料水分越低,膨化温度越低,模头长度越短,越有利于获得高NSI的玉米蛋白。并用均匀试验设计优化了影响蛋白质溶解性的工艺条件;获得高NSI的最优挤压条件为:物料水分11%,螺杆转速160rpm,膨化温度75℃,模头长度300mm;各因素对玉米粗蛋白NSI的影响次序为:物料水分、膨化温度、模头长度、螺杆转速。蛋白质经过挤压膨化处理,可大大改善其功能性质指标,与此同时产品的色泽、气味也得以改善,消化利用率提高。     

挤压复配红薯米工艺参数对压力的影响

为探索双螺杆挤压红薯全粉复配营养米工艺中不同螺杆转速、挤压糊化温度、水分含量对系统压力的影响,以期为红薯米规模化生产提供理论依据,采用单因素及正交实验,结合红薯米质构特性中咀嚼感,优选出最佳工艺参数。结果表明:压力随螺杆转速升高先降低后升高复降低,咀嚼感随螺杆转速升高先升高后降低,压力和咀嚼感均随挤压糊化温度升高而升高,随水分含量升高而降低。对于压力,水分含量的影响最大,挤压糊化温度次之,螺杆转速影响最小;对于咀嚼感,螺杆转速影响最大,水分含量次之,挤压糊化温度影响最小。正交实验结果表明:螺杆转速145 r/min、挤压糊化温度125℃、水分含量29%时,红薯米咀嚼感最好、压力最小,此结果可用于生产实践。     

发芽糙米挤压膨化产品的质量性状分析

采用了Design-expert中心组合试验研究了双螺杆挤压膨化工艺技术对发芽糙米的影响,通过膨化率、吸水性指数、水溶性指数因素和回归旋转试验研究物料水分、螺杆转速和膨化温度对挤压产品质量性状,各质量性状间的相关关系从而确定发芽糙米挤压膨化产品质量性状和工艺参数间的关系,构建产品质量评价指标体系.结果表明,发芽糙米最佳条件为膨化温度140℃、螺杆转速250 r/min,物料水分22.3%.物料水分含量显著影响发芽糙米的吸水性和水溶性;且吸水性、水溶性与膨化度之间相关性显著.发芽糙米挤压膨化工艺参数与产品质量性状间相关性显著.     

挤压加工对豆渣中可溶性膳食纤维和豆渣物性的影响

以豆渣粉为原料,通过优化挤压加工条件,提高豆渣中可溶性膳食纤维(SDF)的含量并改善豆渣物性.通过单因素实验,豆渣挤压的最佳工艺条件为:温度160,℃,物料水分25%,转速100,r/min.优化挤压条件后,豆渣中可溶性膳食纤维含量与原始豆渣相比从2.6%增加至30.1%.豆渣粉挤压前后的物性实验表明:挤压豆渣在水溶性、膨胀性和乳化性方面与原始豆渣粉相比分别提高10.4%、15.6%和130%.豆渣粉的差示扫描量热(DSC)分析结果表明:挤压豆渣粉在200,℃以下结构稳定;扫描电子显微镜(SEM)观察挤压豆渣结构,可以看出其纤维结构有明显的热降解现象.     

响应曲面分析法制备小麦麸皮脂肪模拟品

以小麦麸皮为原料制备脂肪模拟品,选用双螺杆挤压机对添加了α-淀粉酶的小麦麸皮进行挤压膨化,通过单因素实验和响应面回归分析确定了DE值为3.2(WBFS3.2)和8.9(WBFS8.9)的两组低DE值小麦麸脂肪替代品的制备工艺,得到双螺杆挤压的工艺条件分别为:WBFS3.2物料含水量30%,进料速度为30 g/min,螺杆转速为120 r/min,挤压温度(机头温度)为140℃,加酶量为0.5%;WBFS8.9物料含水量35%,加酶量为0.6%,其他条件与WBFS3.2的相同.     

挤压膨化技术开发保健混合粉

探讨了双螺相挤压机对混合物料（黑米：薏米：荞麦=60%：15%：25%）进行挤压膨化的生产工艺，研究了物料水分含量、挤压温度、螺杆转速对产品糊化度的影响。结果为：物料水分含量16%，挤压温度170℃，螺杆转速100r/min，挤出物的膨化效果最佳。     

加工工艺对玉米方便速食粥食用品质的影响

玉米方便速食粥是采用物理改性技术加工制成的方便主食品.为研究各加工工艺对速食粥食用品质的影响,以玉米粉为主要原料,采用挤压质构重组技术研究开发方便速食粥产品,并分析加工工艺对于玉米方便速食粥食用品质的影响.结果显示:各加工工艺参数对方便速食粥食用品质影响均显著,其中螺杆转速、喂料量对食用品质的影响呈先升高后降低的规律.食用品质随挤压温度的升高而降低,随水分质量分数的提高呈上升趋势.在螺杆转速220 r/min,切刀转速2 100r/min,挤压温度110℃,喂料量18 kg/h,水分质量分数33%时,产品食用品质质量较高.测试物料熟化时间后也发现,基本规律与食用品质规律相似.     

高湿挤压工艺条件对仿真鸡肉硬度的影响

以大豆分离蛋白、脱脂大豆粉和谷朊粉为原料,利用高湿挤压法开发仿真鸡肉制品,加工工艺条件对仿真鸡肉硬度的影响进行了详细的研究.试验采用中心旋转组合试验设计,根据所得数据建立了硬度(Y)和水百分含量(X_1)、挤压温度(X_2)、螺杆转速(X_3)及分离蛋白百分含量(X_4)的相关数学统计模型.最终确定了以硬度为参考指标的高湿挤压法制备仿真鸡肉的最优工艺参数,即水分百分含量为52.0%~55.8%,挤压温度为126.4~133.2℃,螺杆转速为257~322 r/min,分离蛋白的百分含量为38.0%~45.2%.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-