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1.
Li Jianping Zhang Wanping Chen Tinghuai Xu Wenzhi 《保鲜与加工》1999,(1):121-125
Some perspective applied areas of wavelet analysis are analyzed in this paper.The application of wavelet in active image compression is deeply explored and the development of wavelet is predicted. 相似文献
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培养基成份影响水稻花培效率的变量分析和主次因子研究 总被引：2，自引：0，他引：2
以 N_6培养基为基础,培养基各组份用量的多少对培养率的影响,进行了全面的优化试验。1987年变化了20个组份的因素水平。在对87年试验结果进行变量分析和主次因子研究的基础上,又设计了1988年的试验,继续改变了17个组份的因素水平。连续两个周期的试验研究表明,培养基各组份的合适用量,以及它们之间的一定的组合关系可导致花培 相似文献
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The coal-bed gas was usually extracted from mine in order to avoid coal gas outburst.The Methane(CH4),a main component in coal-bed gas,is a kind of excellent gas fuel and raw material for chemical industry.China is very rich in the resource of coal bed gas,however,most of the coal bed gas extracted from mine is wasted because of the too low concentration of methane. Pressure sweep adsorption(PSA) technique is noticeable among the methods for the concentration of methane from coal-bed gas.However,there are a few studies about this field.Studies on the pressure sweep adsorption(PSA) process for the separation of CH4/N2 using actived carbon as adsorbent are summarized.The thermodynamic relationships and kinetic processes and the influence of the operate parameters on the concentration of methane are investigated.These results have a direct application in coal-bed gas.Some suggestions for the problems need to be solved in PSA process for the separation of methane are also proposed. 相似文献
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Mathematical methods for generating uniformly distributed U(0,1) random numbers are described.A comprehensive evaluation method for uniformly distributed random numbers is presented.This method is used to evaluate the randomness of uniformly distributed random sequences generated by software.Some good seeds have been selected out that can be used to generate uniformly distributed random sequences with better performance. 相似文献
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We atternpt to describe an Engineering drawings scan and vectorization inputsystem,which can send to drawings into a computer and transfer the resulting data to commerciallyavailable CAD/CAM systems by image processing and pattern recognization; Some results processedby the system are given in the paper. 相似文献
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D. A. Bond 《Euphytica》1989,41(1-2):81-86
Summary Yields of F1 hybrids averaged 22% more than the mean of their heavier-yielding inbred parents, and the advantage of hybrids over composite populations varied from 3 to 18%, more in winter than spring beans.From estimates of cost/benefit ratios that included the possibility of poor seedset on male steriles, on average 1 year in 10, it was concluded that hybrid seed might cost more than twice that of conventional varieties, but a 10% increase in yield on a 4t/ha crop would cover this extra cost of seed.Thus, hybrids could still be the more profitable type of variety provided seed rates are low and yield levels high. It is therefore still worthwhile to pursue the goal of stable cytoplasmic male sterility (CMS) and/or a control of the rate of increase in revertants. Some methods are suggested whereby it might be possible to reduce revertants, improve pollination or exploit heterosis other than with CMS. 相似文献
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Information inspecting and evaluating in information are the important aspects for microteaching development. The design and realization of microteaching compositive evaluating system by using database and software technology, and the method based on fuzzy compositive judgment to design the evaluating system, which provides a science and impersonal evaluating method are deeply disscussed. The system structure, which is compositive form of C/S and B/S, function model and realization method are described in detail. C/S part is mainly in charge for computing, statistics and evaluating, and B/S part mainly for issuing the result of evaluation and querying the information of system. It is proved to be true that this mixed structure gets good effects in the system development and usage. 相似文献
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This paper describes an application of evolutionary programming(EP) to reactive power optimization and voltage control of power systems.Some technical problems which conclude mutation sacle,fitness value and population size have been solved to make EP practical for solving the optimal power flow problems.The computational results with EP have been compared with those obtained from a conventional gradient based optimization method.The comparision shows that EP are better than conventional methods in dealing with the optimization of noncontinuous and nonsmooth funcnons.The EP show the ability to search for the global optimum in reactive optimization that has multiple optima. 相似文献
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Yang Yongzhen Miao Yi 《保鲜与加工》1992,(5):83-88
Some control schemes for complex nonlinear systems have been developed recently and the robotic adaptive control is one of the typical examples. Due to the inevitable presence of unmodeled dynamics,if the adaptive control technique combined with nonlinear model-based control takes full advantages over any known parametric model while dealing with the remaining unknown parameters by using adaptive control,it may be an efficient control strategy, therefore.an algorithm of computed torque-self tuning control for robot is presented, whose simulation results have proved its effectiveness. 相似文献
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An eosin B staining procedure for use with confocal microscopy (WE‐CLSM) was used to examine the mature embryo sacs in 24 typical autotetraploid (2n = 4x = 48) indica/japonica hybrids and to compare with their original diploid (2n = 2x = 24) indica/japonica hybrids in rice. Four of the 24 hybrids showed >80% embryo sac fertility, and 13 hybrids over 70%. The average embryo sac fertility of the 24 autotetraploid indica/japonica hybrids was 68.08%, which was 17.33% higher than that in diploid hybrids. When compared with the diploid hybrids, 79.17% of the autotetraploid hybrids had higher embryo sac fertility. A diversity of abnormal embryo sacs occurred in autotetraploid indica/japonica hybrids. Embryo sac abnormalities were similar for both autotetraploid and diploid hybrid, but their frequencies were different. Some novel abnormal types were found in autotetraploid hybrids, such as enlarged egg apparatus. The embryo sac fertilities and frequencies of various abnormalities in autotetraploid hybrids varied with parental genotype and environment. The average seed set of the autotetraploid hybrids were higher than their diploid hybrids in different growing seasons. 相似文献
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为构建苦荞EMS突变体库和为苦荞功能基因组学研究准备基础材料,利用化学诱变剂甲基磺酸乙酯（ethyl methane sulfonate,EMS）诱变处理刺荞种子,对获得的M2代材料进行生物学性状与农艺性状鉴定,并对部分M2代材料播种家系进行验证。对M2代全生育期田间表型进行观察鉴定,共获得480份突变体材料,包括子粒、叶片、茎秆及生育期等生物学特性与主要农艺性状突变体,变异类型丰富,尤其是首次发现了子粒多棱苦荞新材料,并发现了自然突变中少见的变异类型,如子粒开裂等变异类型。所构建的刺荞EMS突变群体较理想,可望有效用于苦荞功能基因组研究和苦荞遗传改良。 相似文献
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After analyzing the feature of C/S and B/S modes, a kind of MIS for power industry, which combined C/S with B/S, is put forward. The C/ S platform is developed with the Powerbuilder 7.0 and SQL Server 7.0, and the B/ S platform is developed with ASP and IIS5.0+ SQL Server7.0. Electric power management information system should be constituted by the seventh statures mold piece, which are the electricity measures to collecting, electricity charges settling accounting system, the safety system et al. In order to meet the demand of data safety of enterprises, the method of passing data between C/S and B/S is introduced. 相似文献
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夏玉米杂交种登海3719根系分布与竞争力 总被引：4，自引：0，他引：4
在大田箱式土柱栽培条件下, 比较了高产玉米品种登海3719和金海5号的根系特征, 并以混播时地上部生物产量变化为依据, 分析了根系特征与竞争能力的关系。结果表明, 在氮肥供应充足条件下, 登海3719单株根系生物量低于金海5号, 根冠比无明显差异, 其0~20 cm根系分配比率大、活力高, 在与金海5号根系竞争中地上部氮素积累量增加6%、生物量提高8%。不施氮时, 登海3719的根冠比增加4%, 金海5号增加21%, 登海3719的根冠比、0~20 cm根系分配比率及活力均低于金海5号, 在根系竞争中氮素积累量减少8%, 生物量下降2%。与金海5号相比, 登海3719在氮素供应不足时, 根系竞争力弱, 适应低氮条件的能力较差, 但在氮肥充足条件下表现吸氮能力高, 竞争力强。 相似文献
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FY3/MERSI和EOS/MODIS归一化植被指数差异分析 总被引：4，自引：2，他引：2
为进行中分辨率成像光谱仪的EOS/MODIS数据与FY3/MERSI数据归一化植被指数(NDVI)的差异性分析,分别选取2008年8月16日、2009年8月30日EOS/MODIS和FY3/MERSI遥感数据,分林地、灌丛、旱田、水田、城市、沙地6种不同地类进行了植被指数计算,并从数据相关性、直方图分布、特征空间分布等方面进行了分析比较。结果表明,MODIS/NDVI 和MERSI/NDVI有着共同的直方图走势,动态范围基本一致,各类地物的反演结果均表现出很好的线性一致性,其中林地R2最高,达到0.8624。 相似文献
17.
Shi Libao Xu Guoyu Feng Qiang 《保鲜与加工》1998,(4)
This paper describes an application of evolutionary programming (EP) to economic dispatch with valve point loading.Some technical problems (representations of candidate solutions,evaluation function,mutation operator) have been solved to expand the applica be prospects of the computatimal methods of economic dispatch.The proposal method is applied to a 6 bus 3 generator system and compared with the genetic algorithm(GA).Numerical results demonstrate the validity and effectiveness. 相似文献
18.
【研究目的】旨在探讨CCL25/CCR9、CCL28/CCR10在仔猪胃肠道中的表达规律。【方法】通过常规RT-PCR检测CCL25/CCR9、CCL28/CCR10分别在15日龄和30日龄仔猪胃肠道不同部位的表达。【结果】 CCL25 mRNA主要在小肠表达,而CCR9 mRNA在小肠、大肠及胃中均表达,且表达量较高;CCL28 mRNA和CCR10 mRNA在小肠、大肠及胃中均表达,并以后段肠道的表达量较高。CCL25/CCR9、CCL28/CCR10在30日龄仔猪胃肠道中的表达高于15日龄仔猪。【结论】初步得出CCL25/CCR9、CCL28/CCR10 在仔猪胃肠道中的表达规律,并为进一步揭示在其它组织中的表达及它们的生物学作用奠定了基础。 相似文献
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The main electrical scheme of a station is principal part of power system electrical connection,and its structure not only determines whether customers can acquire enough electric energy,but also influence economical efficiency of construction and reconstruction of a station.3/2 Connection and 4/3 Connection have been widely used in large scaled station.Three groups of alternative designs are chose in the article,of which the first group is single unit connection,and the other two are combined unit connection,and in each group there are one 3/2 Connection and 4/3 Connection plan.A reliability analysis system of main electrical scheme has been applied,to compare and analyze the reliability and economical efficiency of these two kinds of connection comprehensively.The result involves adequacy,security,economical efficiency indices and sensitivity analysis of component dependability parameter of each design.The result shows both 3/2 Connection and 4/3 Connection has its own relative merits,but 3/2 Connection has well applicability: Failure rate of generation has most obvious influence on reliability of the main electrical scheme.And quantified calculation of reliability is necessary in planning and choice of main electrical scheme of station. 相似文献