蜂蛹蛋白的酶解工艺研究

以蜜蜂蜂蛹为原料,研究蜂蛹蛋白质酶解工艺,并对所得结果进行分析。结果表明,胰蛋白酶水解蜂蛹蛋白质最适条件为:酶解温度为60℃,酶用量为1.5%,酶解时间1.5 h,pH值为8.0,料水比为1∶8,最适水解条件下,水解液中的氨基氮质量浓度为1.526 mg/mL;中性蛋白酶水解蜂蛹蛋白质最适条件为:酶解温度为45℃,酶用量为2.0%,酶解时间为1 h,pH值为7.5,料水比为1∶6,最适水解条件下,水解液中的氨基氮质量浓度为2.068 mg/mL;最优水解酶是中性蛋白酶;双酶水解蜂蛹蛋白质的最适条件为:总酶量为2.0%,酶量比为1∶2,酶解温度50℃,酶解时间为2 h,最适水解条件下,水解液中的氨基氮质量浓度为1.889 mg/mL。双酶同时水解的效果不及中性蛋白酶。     

苯磺隆、苄嘧磺隆对不同小麦品种安全性及叶绿素含量的影响

室内土壤滴浇法测定了苯磺隆、苄嘧磺隆对不同小麦品种的安全性和叶绿素含量的变化,结果表明：两种药剂对不同小麦品种的安全性存在较大差异,且对根长的抑制作用明显大于株高;对叶绿素含量的影响与对株高的影响结果一致。苯磺隆对周麦13的根和芽敏感,使用不当易产生药害;对偃师4110根长最安全,株高最敏感。苄嘧磺隆对高优503根长最安全,株高最敏感;对周麦13株高最安全,根长最敏感。因此,小麦田化学除草应根据不同小麦品种来选择除草剂品种、有效用量和最佳施药方法。     

Algorithm of Cutter Machining Position during Numerical Controlled Last Carving

Numerical control last making machine is a machine that is used to process shoe last. A new principle of numerical control machining shoe last is put forward aiming at the deficiency of current carving last system. On the basis of the principle, the algorithm of cutter machining position during numerical controlled carving last is analyzed in detail. The complex problem of the calculation of cutter machining positiion is resolved by applying spherical milling cutter that is often used in machining free_curve surface today and taking account of practical situation of the shoe last_making machine. At the same time, the calculation of cutter machining position is realized by program using Visual C++6.0. As a result, the calculation time of cutter machining position is reduced greatly and the efficiency of design is improved. Moreover, the process of carving last is agile and precision of carving last is ensured.     

旱作对稻米蒸煮品质的影响研究

选用以IR64为受体的抗旱基因聚合杂交后代的147个新品系为材料,以水作为对照,研究了旱作对稻米蒸煮品质的影响。结果表明：总体上旱作处理下抗旱新品系的胶稠度比水作处理下低,胶稠度越高的品系,旱作胶稠度降低越大;旱作处理下的碱消值比水作的高,碱消值越高的品系,旱作和水作处理下的差别越小;旱作处理下的直链淀粉含量比水作处理下低,随着直链淀粉含量的增加,旱作和水作的差别越大,但在AC较低时,旱作条件下比水作条件下稍高。在糊化温度和直链淀粉含量两性状上,旱作对改善品质是有利的,对胶稠度不利,不过胶稠度较高的品系中也有个别品系旱作处理的胶稠度比水作的相近或稍高,这些品系有望育成抗旱新品种作为旱作品种推广。     

Mo17抗玉米丝黑穗病的基因效应分析

在人工接种条件下研究了玉米丝黑穗病重要抗源Mo17在不同感病背景下的基因效应差异。两背景下不同世代间玉米抗丝黑穗病程度存在极显著差异，F1和F2的病株率介于双亲之间，偏向与抗病亲本，均无超亲优势，F1与双亲回交，后代的病株率基本偏向于回交亲本；玉米抗丝黑穗病的遗传分别符合六参数和四参数模型，其遗传贡献中主要以加性和显性效应为主，但在黄早四背景下表现为超显性且存在明显的上位效应，而3788背景下加性、显性效应相当，且仅存在加性、显性上位效应；以Mo17为抗病亲本组合的抗病性至少由1对抗性基因控制，估计的基因对数为0.48~1.03。     

杜仲籽油的提取及其微胶囊的制备

以杜仲籽为原料,采用索式提取法对杜仲籽油进行提取及工艺优化研究,并采用复凝聚法研究杜仲籽油微胶囊化工艺条件。研究结果表明,采用正己烷萃取杜仲籽油的最优条件为:萃取试剂与杜仲籽比例为7.5:1(mL:g),萃取温度为85℃,萃取时间为6 h,此时出油率为31.55%,利用明胶和阿拉伯胶作为壁材微胶囊包埋杜仲籽油的最优条件为:芯材与壁材比例(即杜仲籽油、明胶和阿拉伯胶的质量比)为1:2:2,反应温度为50℃,反应时间为60 min,pH值为4,此时油利用率为87.8%,包埋率为34.32%,产品收率为51.16%。     

Research on Load Prediction Model of Air Condition System Based on Elman Neural Network

The load of air condition system is influenced by many factors, and they are variable and nonlinear, The relation between them is dynamic,It is impossible to forecaste the load of air condition syestem accurately by traditional method. But Recurrent Neural Network is able to reflect the dynamic lively and directly. Elman is one of the typical RNN. Based on the analysis as above, prediction model of air-condition system based on Elman neural network is established, and some prediction is done. The prediction accuracy of Elman neural network and BP neural network is compared, and the experiments show that the Elman neural network is efficiency and accuracy , so Elman neural network is a new and reliable method for predicting the load of air-condition system.     

油茶气象影响指标研究综述

基于收集到的近百篇与气象条件有关的油茶研究文献和出版书籍,进行气象条件对油茶生产影响的归类统计,其结果可分为3类,即油茶种植气候适宜性指标、油茶产量气象条件的影响指标、油茶气象灾害指标。油茶种植气候适宜性指标及条件为：（1）年平均气温14~21℃,最适宜温度为16~21℃,极端最低气温-10℃,极端最高气温40℃,最冷月平均气温0℃以上,最热月平均气温31℃以下,年无霜期大于200天,≥10℃积温为4000~7000℃·d,最适宜的≥10℃积温为5000~7000℃·d;（2）年降水量1000~ 2200 mm,最适宜年降水量为1200~1800 mm;相对湿度74%~85%;（3）年日照时数1500~2200 h,年日照百分率35%以上。油茶产量适宜性气象指标及条件为：（1）春梢生长期适宜的平均气温为10~20℃;（2）花芽分化期适宜的平均气温为24~33℃,最适宜平均气温为27~33℃,日平均日照时数在10 h以上;花期适宜的平均气温为10~20℃,最适宜平均气温为14~18℃,盛花期雨日小于13天,日照大于100 h;（3）果实生长期适宜的平均气温为25~30℃,降水量在200 mm以上,最适宜降水量为450~550 mm;（4）油脂累积期适宜的平均气温为16~23℃,降水量在100 mm以上,最适宜降水量为150~200 mm,高温日数小于20天。油茶主要气象灾害有：低温冷冻害、连阴雨、高温干旱、冰雹和大风。     

灰树花子实体中水溶性多糖提取工艺优化研究

以水为浸提液,通过单因素试验研究了颗粒度、浸提温度、浸提时间、水料比、醇沉度等因素对灰树花子实体多糖提取率的影响,并采用正交试验对提取工艺进行优化。试验表明,水料比对灰树花子实体多糖提取率的影响最大,其次是浸提时间,浸提温度影响最小。通过对提取条件的优化,结合收益、成本等综合因素选出最佳优化工艺为:浸提温度90℃,浸提时间5 h,水料比25∶1。验证试验显示,在最佳工艺条件下提取的多糖提取率达13.4%。     

河南省棉花纤维主要品质指标分析及分区探讨

根据2002年国家棉花品种区试黄河流域棉花品种区域试验数据和河南省棉花质量检测中心抽样数据,分析棉花长度、比强度、麦克隆值等纤维品质指标。将河南省的植棉区分为豫东、豫东南、豫西南、豫北4个分区。这些分区间的纤维品质指标存在显著差异。国家区试数据和河南省棉花质量中心抽样数据结果基本一致。区试数据结果:纤维长度、比强度、麦克隆值3项指标豫东最优,豫东南优于豫北。豫东的纤维长度为30.30mm,较豫北的28.96mm长1.34mm;麦克隆值较豫北小1.23,较豫东南小0.51。河南省抽样数结果为豫东较优,豫北区欠佳,豫西南的纤维偏粗。总体上看河南省的棉花纤维品质集中在中档棉这一档次,要提高棉花纤维品质,需要在比强度和纤维长度上加强。     

A Test and Analyzing System of Manufacture Errors onPlang-generated Hourglass Worm

Aiming at solving the matter of fact of manufacture errors on worm, the worm test apparatus is studied by the tool research department in Chengdu.A kind of improved principle,hardware and software design of the project is discussed. The primary aim of the single chip microcomputer circuit of this project is data collecting, and the invention monopoly of professor Zhangguanghui of Chongqing university is applied. The high frequency inserted pulse is used, and the software is joined in constitute subsidiary calibration distributed on equal time. The task of online subdivision in the dynamic measure process is completed. The data are passed to PC, PC handle them and examination result is gotten. The integration of the process is very high, and the tedious and complicated hardware circuit is simplified like the tradition examination method.     

Network Partitioning Based on Threshold Search and Dynamic Scatter for Voltage/Var Control

Secondary Voltage Control is a new way of voltage control,firstly the power system is divided into many control areas whose electric distance is remote.The partitioning method of secondary voltage control is studied and an algorithm that combination of the threshold search and dynamic scatter is presented.That is,the initial grouping scheme is obtained by searching the threshold value.The dynamic scatter method then is used to regulate and improve the initial results.The method is based on system's physical character,it's unnecessary to modify the network's model and analysis the eigenvalue,so the compute rate is fast.Through comparing the method and the traditional methods,this method is proved to be a reasonable and feasible partitioning scheme.     

Video Compression of Vector Coding based on Wavelet Transform

It is possible to get high compression rate for the interrelationship between neighboring frames of moving pictures. The kernel of research on video compression is that the efficient image compression algorithm is adopted while the interrelationship between neighboring frames and time consumption is concerned to improve the compression efficiency. It is significant that motion compensation is applied to video compression, nevertheless it is too time consuming. A vector coding method based on wavelet transform is presented to avoid searching procedure of motion compensation. Simulation shows that high compression rate is achieved with less time consumption.     

洛阳市绿地景观格局分析及综合评判

绿地景观是城市生态系统的生态基础,人类赖以生存的基质与环境,城市生物多样性的载体,以洛阳市绿地景观为研究对象,利用遥感(RS)技术获取绿地的景观信息,建立了洛阳市绿地信息专题数据库,在景观生态学理论指导下,从绿地量、绿地规模、连接程度、空间布局等方面进行了洛阳市绿地景观格局分析,并通过主成分分析法,利用主成分与贡献率乘积的累积值,对不同区域绿地进行景观格局综合评价,将评价指标综合为景观格局、分离度和廊道密度3项指标,由于涧西区的人均绿地面积、绿化覆盖率、斑块平均面积、景观优势度、多样性指数均为最大;得出涧西区最优,西工区次之,老城区第三,洛龙区第四,瀍河区最差。该方法为绿地景观格局的综合评价提供了一定的参考,为洛阳市绿地系统的景观结构优化提供依据。     

Finite element analysis of the LX150 motorcycle crankcase box

The wall thickness and strengthen muscle of motorcycle crankcase box influences its structure intensity directly. The static model of crankcase box of a magnesium alloy material is established by finite element method. The structure is analyzed with I-DEAS, the reason the crankcase box is crazed is pointed out. The structure is rebuilt, the intensity is increased remarkablely, the cost of manufacture is reduced largely. And the capability of a originally material, i.e. aluminium alloy is validated.     

Conditional Value-at-Risk and Its Use in Credit Risk Measurement of Banks

Credit risk, the major risk of bank, is more and more intense during the period of economic restructuring in China. In view of the flaw of present risk measurement system, Conditional Value-at-Risk is used for the credit risk measurement which is better than Value-at-Risk. This paper creates the model ,while gives the method and procedure for solving it. So CVaRof credit combination is produced, which is just the early warning value of credit risk. At last, it is concluded that the CVaRrisk measurement is too difficult to use widely at present in china, then some advice is provided.     

Numerical Analysis of Acoustic Environment with Finite Element Method

The acoustic environment of highway tunnel is complex and has influences on the driving safety and comfort. In case of emergency, evacuation information is difficult to transfer. Finite element method is used for calculating highway tunnel acoustic modal and attenuation characteristics. The results show that acoustic mode of highway tunnel has symmetry in the horizontal pressure amplitude of symmetry regional is equal and phase is the same or opposite. The higher modal frequency, the greater sound pressure amplitude is, and the effect of tunnel length on modal frequency is smaller. Decay curves of pressure level at each point in the highway tunnel over time are nonlinear. After the source excitation, in 1.5 s, attenuation rate is faster than that of few seconds later and the attenuation time of sound pressure level 30 dB is 5.5 to 7 s.     

Galerkin Boundary Element Method for Laplace Equation

Galerkin method based on the variation principle is used to solve differential and integral equations. The boundary problem of Laplace equation is changed into the variational equation which is equivalent to the boundary integral equation. Using linear element, it is solved by Galerkin boundary element method. In computation of stiffness matrix, the exactly integral formula is used in the first order integral expression, The numerical integral formula is used in the second order integral expression. Thus the problem of calculation of double singular integral is carried out. The numerical experiments also prove this method is reliable. The error of Galerkin boundary element is tested with numerical experimentation.     

Dynamic Characteristics Analysis and Structure Design of Improvement for Exhaust Manifold Cover

The exhaust manifold cover is the main source of surface radiate noise of a 6 360 vehicle's engine.By using the finite element analysis technology,a finite element model of the cover is established,and then the modal analysis is done theoretically with this model,the result is consistent with the experiment.On this basis,the transient response of the cover under the excitation of engine block's vibration is analyzed.The result show that the free edge is the main source of radiate noise,because its normal velocity is maximal.The improved measures are adopted which is based on the practical structure of the cover.The analysis of the improved structure shows that the measures are effective,the radiate noise of the cover is decreased distinctly.     

花生绿豆复合罐头工艺优化

以花生、绿豆为主要原料,研究了花生绿豆复合罐头的加工工艺。结果表明,花生的最佳预煮条件为:在85℃的水中预煮5 min,料水质量比为1∶3.5;绿豆的最佳预煮条件为:95℃的水中预煮7 min,料水质量比为1∶4;调味料的最佳配方为:食盐2.0%,香料1.0%,蔗糖1.5%;排气条件为:90℃水中恒温6 min,杀菌条件为100℃水中杀菌9 min。制得的花生绿豆复合罐头汤汁呈均匀褐色,花生为淡红色,绿豆为翠绿色,皆颗粒完整无破损,且香嫩可口,香味柔和协调。