FRAP法微量模型的建立

目的:建立总抗氧化能力评估法FRAP法微量模型。方法:以槲皮素为研究对象,通过单因素考察,建立L9(34)正交实验,对正交实验进行直观分析和方差分析。结果:由正交实验结果得出最佳实验条件为:1倍量的TPTZ溶液(0.3mol/L醋酸钠缓冲液,10mmol/LTPTZ溶液,20mmol/L氯化铁溶液三者按照顺序体积比为10∶1∶1),加入量为200μL,在37℃下反应时间为40min。验证实验结果RSD值为0.082%,表明该方法稳定可靠,本实验以PG、BHA、BHT做阳性对照,结果表明,此模型准确可行。结论:实验结果表明,本次实验建立的FRAP总抗氧化能力评估法准确,用药量小,稳定可行。

清除ABTS自由基微量模型的建立

以槲皮素为研究对象,通过单因素考察,建立L9(34)正交试验,对正交实验进行直观分析和方差分析来建立清除ABTS自由基微量模型。由正交实验结果得出最佳实验条件为:在734 nm处ABTS吸光度为0.7,加入量为200μL,反应时间为避光20 min。验证实验结果 RSD值为0.62%,表明该方法稳定可靠,实验用BHT和Trolox做对照实验,结果表明,本次建立的清除ABTS自由基微量模型评估法准确,用药量小,稳定可行。

醛糖还原酶抑制剂的微量筛选模型的建立

从牛晶状体中提取醛糖还原酶，采用９６孔板建立该酶的体外微量高效筛选模型，筛选过程简便快捷。

基于微量筛选模型的48种中草药提取物乙酰胆碱酯酶抑制活性筛选及评价

采用微量筛选模型考察48种中药提取物的乙酰胆碱酯酶抑制活性。采用不同极性溶剂对中药材进行提取,采用微量筛选模型对不同浓度提取物的乙酰胆碱酯酶抑制活性进行考察,并采用Origin8.0计算其IC50值。结果表明,几种中药材的不同极性溶剂(水、80%乙醇、乙酸乙酯、石油醚)提取物有不同程度的乙酰胆碱酯酶抑制活性。其中黄柏、元胡的80%乙醇提取物,丹参的乙酸乙酯提取物的抑制率较高。当上述提取物在实验体系中的终浓度为76.92 mg/L时,抑制率分别为66.72±0.02%、52.67±0.04%、46.84±0.03%,其IC50值分别为295.12、229.09、1202.26 mg/L。本研究结果为从中草药中快速筛选乙酰胆碱酯酶抑制剂提供了方法和数据支持。

理想微量元素模型提高动物生产性能

经过多年的研究,科学家发现营养物之间会竞争吸收位点,与氨基酸平衡理论相似,各种微量元素之间也存在复杂的互作和拮抗作用。而微量元素的吸收同时与饲料中的协同物质与颉抗物质存在量密切相关。中国饲料中普遍存在的高铜的现象,为了避免高铜带来的氧化应激及可能的亚中毒问题,又不影响其它微量元素铁和锌的吸收,必须添加高铁和高锌,造成了大量无机微量元素的浪费损失,饲料利用率显著下降,同时严重污染环境。在饲料中我们同时添加多种微量元素,只要有一种微量元素过量或不足,微量元素总体利用率就会下降,造成浪费,所以我们强调各种微量元素之间要尽可能平衡地添加,以确保达到最佳利用率。理想微量元素模型是根据大量的试验总结,以较好的试验结果所总结出来的不同种类微量元素之间的比例关系,主要是铁,铜,锰,锌之间的比例及添加量,以确保动物能够以较少而经济的添加量而得到更好的生长,免疫及繁殖效果。本文以铜为例综述了无机微量元素的缺陷及各种有机微量元素的差异,提出了应用理想微量元素模型提高动物生产性能的概念。

甜瓜白粉病防治药剂活体筛选模型研究

【目的】寻找新的甜瓜白粉病杀菌剂筛选方法。【方法】在不同品种和不同部位的甜瓜叶片上接种白粉病菌，并在不同的温度和光照条件下培养。【结果】选用厚皮甜瓜真叶叶盘（4cm×2cm）为试材，从叶盘背面喷雾接种白粉病菌的孢子悬浮液，孢子浓度为3×10^4个·mL^-1，处理后的叶盘置于铺有湿滤纸的密封培养皿（9cm×9cm）中，RH80％～90％，培养条件为温度20℃，光照12h·d^-1。【结论】建立出一种甜瓜白粉病防治药剂活体微量筛选模型，为新合成化合物杀菌剂活忡的筛洗槔供了新方法。

基于潜在语义索引的文本摘要方法

因特网上的在线文本自动编制摘要可以帮助用户有选择地阅读 .给出了基于潜在语义索引的文本摘要方法 .它采用向量空间模型作为文本表示方法 ,利用潜在语义索引来减少词汇间的“斜交”现象 ,在语义空间上进行项、句子、段落与文本之间的相似度计算 ,而不是单纯地依赖于特征项的频率信息 .依据对于文本主题的表现能力来确定摘要的各个组成部分及其组成方式 .此外 ,给出了文本摘要的评估方法 .

Rice Yield Estimation by Integrating Remote Sensing with Rice Growth Simulation Model

Since remote sensing can provide information on the actual status of an agricultural crop, the integration between remote sensing data and crop growth simulation models has become an important trend for yield estimation and prediction.The main objective of this research was to combine a rice growth simulation model with remote sensing data to estimate rice grain yield for different growing seasons leading to an assessment of rice yield at regional levels. Integration between NOAA (National Oceanic and Atmospheric Administration) AVHRR (Advanced Very High Resolution Radiometer) data and the rice growth simulation model ORYZA1 to develop a new software, which was named as Rice-SRS Model, resulted in accurate estimates for rice yield in Shaoxing, China, with an estimation error reduced to 1.03% and 0.79% over-estimation and 0.79% under-estimation for early, single and late season rice, respectively. Selecting suitable dates for remote sensing images was an important factor which could influence estimation accuracy. Thus, given the different growing periods for each rice season, four images were needed for early and late rice, while five images were preferable for single season rice.Estimating rice yield using two or three images was possible, however, if images were obtained during the panicle initiation and heading stages.

2-D IMAGE-BASED VOLUMETRIC MODELING FOR PARTICLE OF RANDOM SHAPE

In this paper, an approach to predicting randomly-shaped particle volume based on its two- Dimensional （2-D） digital image is explored. Conversion of gray-scale image of the particles to its binary counterpart is first performed using backlighting technique. The silhouette of particle is thus obtained, and consequently, informative features such as particle area, centroid and shape-related descriptors are collected. Several dimensionless parameters are defined, and used as regressor variables in a multiple linear regression model to predict particle volume. Regressor coefficients are found by fitting to a randomly selected sample of 501 panicles ranging in size from 4.75mm to 25ram. The model testing experiment is conducted against a different aggregate sample of the similar statistical properties, the errors of the model-predicted volume of the batch is within ±2%.

Mechanism of gas-water flow at pore-level in aquifer gas storage

By means of the pore-level simulation, the characteristics of gas-water flow and gas-water distribution during the alternative displacement of gas and water were observed directly from etched-glass micromodel. The results show that gas-water distribution styles are divided into continuous phase type and separate phase type. The water lock exists in pore and throat during the process of gas-water displacement, and it reduces the gas flow-rate and has some effects on the recovery efficiency during the operation of gas storage. According to the experimental results of aquifer gas storage in X area, the differences in available extent among reservoirs are significant, and the availability of pore space is 33% 45%.

Parametric analysis of mixed lubrication characteristics in work zone of strip rolling

A theoretical model for mixed lubrication with more accurate contact length has been developed based on the average volume flow model and asperity flattening model,and the lubricant volume flow rate and outlet speed ratio are determined by integrating differential equations based on rolling parameters.The lubrication characteristics at the roll-strip interface with different surface roughness,rolling speed,reduction and lubricant viscosity are analyzed respectively.Additionally,the average volume flow rates of lubricant under different rolling conditions are calculated and used to explain the change rule of lubrication characteristics.The developed scheme is able to determine the total pressure,lubricant pressure,film thickness and real contact area at any point within the work zone.The prediction and analysis of mixed lubrication characteristics at the interface is meaningful to better control the surface quality and optimize the rolling process.

The Critical Properties of One—Dimensional Extended Hubbard Model

In the framework of nonperturbative quantum field theory, the critical phenomena of one-dimensionalextended Hubbard model (EHM) at half-filling are discussed from weak to intermediate interactions. After the EHMbeing mapped into two decoupled sine-Gordon models, the ground state phase diagram of the system is derived in anexplicit way. It is confirmed that the coexisting phases appear in different interaction regimes which cannot be foundby conventional theoretical methods. The diagram shows that there are seven different phase regions in the groundstate, which seems not to be the same as previous discussions, especially the boundary between the phase separationand condensed phase regions. The phase transition properties of the model between various phase regions are studied indetail.

Remote sensing Extraction model of redtide biomass by airborne hyperspectral technique

Our work is based on the known research results of inherent optical quality of ocean color constituents.According to optimized parameters and induced fluorescence term of chlorophyll, this paper puts forward a remote sensing reflectance model of sea water, which is fitted in Liaodong Bay of Bohai. An inverse model that can evaluate redtide biomass according to chlorophyll retrieval is provided by inducing a functional extreme problem. The calculation example of the model indicates that the inversion model has explicit mathematic and physical meaning, but its practicability needs to be verified.

Cavity-Enhanced Third Harmonic Generation

We derive the analytical expression of microcavity-enhanced factor for third harmonic generation in terms of detunings, linewidths, and the Purcell factors of the relevant microcavity modes. It is suitable for microcavities with any dimensions and arbitrary geometric shapes.

Phenomenology of Friedberg-Lee Texture in Left-Right Symmetric Model

We consider that the Higgs triplet Yukawa coupling takes the Friedberg-Lee texture, and the Higgs doublet Yukawa coupling simply identifies with the diagonal Yutawa coupling of charged lepton in the context of left-right symmetric model. In this scenario, the phenomenology, including effective neutrino masses, mixings, and thermal flavor-dependent leptogenesis and lepton flavor violation decays are studied. We investigate the combined constrain of the parameters in this scenario and test its consistency with present data.

Retrieval algorithm of sea surface wind vectors for WindSat based on a simple forward model

WindSat/Coriolis is the first satellite-borne polarimetric microwave radiometer, which aims to improve the potential of polarimetric microwave radiometry for measuring sea surface wind vectors from space. In this paper, a wind vector retrieval algorithm based on a novel and simple forward model was developed for WindSat. The retrieval algorithm of sea surface wind speed was developed using multiple linear regression based on the simulation dataset of the novel forward model. Sea surface wind directions that minimize the difference between simulated and measured values of the third and fourth Stokes parameters were found using maximum likelihood estimation, by which a group of ambiguous wind directions was obtained. A median filter was then used to remove ambiguity of wind direction. Evaluated with sea surface wind speed and direction data from the U.S. National Data Buoy Center （NDBC）, root mean square errors are 1.2 rn/s and 30~ for retrieved wind speed and wind direction, respectively. The evaluation results suggest that the simple forward model and the retrieval algorithm are practicable for near-real time applications, without reducing accuracy.

Sensorless control for hysteresis compensation of AFM scanner by modified Rayleigh model

A novel modified Rayleigh model was developed for compensating hysteresis problem of an atomic force microscope(AFM) scanner.In high driving fields,piezoelectric actuators that integrated a scanner have severe hysteresis,which can cause serious displacement errors.Piezoelectric hysteresis is from various origins including movement of defects,grain boundary effects,and displacement of interfaces.Furthermore,because its characteristic is stochastic,it is almost impossible to predict the piezoelectric hysteresis analytically.Therefore,it was predicted phenomenologically,which means that the relationship between inputs and outputs is formulated.The typical phenomenological approach is the Rayleigh model.However,the model has the discrepancy with experiment result as the fields increase.To overcome the demerit of the Rayleigh model,a modified Rayleigh model was proposed.In the modified Rayleigh model,each coefficient should be defined differently according to the field direction due to the increase of the asymmetry in the high fields.By applying an inverse form of this modified Rayleigh model to an AFM scanner,it is proved that hysteresis can be compensated to a position error of less than 5%.This model has the merits of reducing complicated fitting procedures and saving computation time compared with the Preisach model.

Neutrino Mass Generation in SO(4) Model

Generation of neutrino mass in SO（4） model is proposed here. The algebraic structure of SO （4） is same as to that ofSU（2）L x SU（2）R. It is shown that the spontaneous symmetry breaking results three massive as well as three massless gauge bosons. The standard model theory according to which there exist three massive gauge bosons and a massless one is emerged from this model. In the framework ofSU（2）L x SU（2）R a small Dirac neutrino mass is derived. It is also shown that such mass term may vanish with a special choice. The Majorana mass term is not considered here and thus in this model the neutrino mass does not follow seesaw structure.

Interacting model of new agegraphic dark energy:observational constraints and age problem

Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe topic of the age problem inthe new agegraphic dark energy(NADE)model.We determine the age of the universe in the NADE model by fitting the observational data,including type Ia supernovae(SNIa),baryon acoustic oscillations(BAO)and the cosmic microwave background(CMB).We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279+5255.In order to overcome such a difficulty,we consider the possible interaction between dark energy and dark matter.We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy(INADE)model at the 2σlevel under the current observational constraints.

Study of Soil-Water Characteristic Curve Using Microscopic Spherical Particle Model

When variations occur in the water content or dry bulk density of soil,the contact angle hysteresis will affect the soil-water characteristic curve(SWCC).The occurrence of the contact angle hysteresis can be divided into slipping and pinning.It is difficult to determine the effect of pinning existence on SWCC by tests.In this study,the effect of contact angle hysteresis on SWCC was analyzed either in the case of no variations in soil dry bulk density with changes in soil water content or no variations in soil water content with changes in soil dry bulk density.In both cases,soil particles were simplified to the spherical particle model.Based on the geometrically mechanic relationship between the particles and connecting liquid bridges,a physical model for predicting the SWCC was derived from the spherical particle model.Adjusting parameters made the model applicable to various soils,that is,the cohesive soil was considered as micron-sized spherical particles.Through the simulations on SWCC test data of sand,silt,clay,and swelling soil,it was confirmed that the physical model possessed good reliability and practicability.Finally,the analysis of rationality of contact angle was performed based on the basic assumptions of the model.