近红外光谱技术在水果品质无损检测中应用的研究与现状

简单概述了我国水果产业的发展现状,着重阐述了国内外利用近红外光谱技术进行水果品质无损检测的最新研究进展,分析了当今研究中存在的问题,并对利用近红外光谱技术进行水果检测的前景进行了展望,提出了一些建议。     

Two sources of excitation of photoluminescence of porous silicon

The change occurring in the photoluminescence spectra and the photoluminescence excitation spectra during aging of porous-silicon samples in air and in vacuum has been investigated. It was found that the character of the photoluminescence changes occurring during aging depends on the wavelength of the exciting light: In the case of excitation in the visible-range band of the luminescence excitation spectrum (λ_exc>490 nm) the photoluminescence decreases and in the case of excitation in the ultraviolet band it predominantly increases. It is shown that the two bands of the luminescence excitation spectrum (visible and ultraviolet) correspond to two different objects on the surface of the porous layer. Fiz. Tekh. Poluprovodn. 31, 908–911 (August 1997)     

奥拉西坦治疗OSAHS大鼠认知障碍的研究

目的：研究奥拉西坦对阻塞性睡眠呼吸暂停低通气综合征（OSAHS）大鼠认知障碍的影响。方法：成年雄性SD大鼠24只,建立慢性间歇性缺氧模型,随机分为空白对照组、慢性间歇性缺氧组、药物组,并用Morris水迷宫实验,评价三组大鼠的空间学习记忆功能。结果：Morris水迷宫学习成绩（定位航行实验）：从第一天开始,慢性间歇性缺氧组的逃避潜伏期明显长于空白对照组,（P〈0.05）,药物组的逃避潜伏期接近空白对照组,无显著差异（P〉0.05）。Morris水迷宫记忆成绩：慢性间歇性缺氧组的穿越平台次数较空白对照组显著减少（P〈0.05）,药物组的穿越平台次数接近空白对照组,两者无显著差异（P〉0.05）。各组在跨越目标象限时间占整个游泳的时间百分率的比较：慢性间歇性缺氧组较空白对照组显著减少（P〈0.05）,药物组接近空白对照组,两者无显著差异（P〉0.05）。结论：慢性间歇性缺氧对大鼠的学习能力有一定的损伤;经奥拉西坦治疗后的大鼠学习能力有了提高。     

Experimental Evaluation of Effects of Channel Doping on Characteristics of FinFETs

We investigated channel doping in fin-type double-gate (DG) MOSFETs. We demonstrated through experiments that the threshold voltage was more sensitive to the dopants in the accumulation mode than in the inversion mode. We also found that significant deviation in the threshold voltage from the expected value arose in ultrathin fin-type DG MOSFETs. We attributed this phenomenon to the unexpected dopant loss from the ultrathin channels due to segregation. This finding means that careful doping adjustments must be made in ultrathin-channel devices.     

Solvability of problems of excitation of plane-layered metamaterial media

It is shown that the problem of excitation of a magnetodielectric layer with parameters ? and μ equal to minus unity by a point source is not always solvable. Conditions under which the problem has a solution are established. It is found that, in the vicinity of the singular point ? = μ = ?1, determination of the field is an illposed problem: Small variations in these parameters result in large changes of the field.     

Estimation of Optimal Parameter of Regularization of Signal Recovery

In this paper there are researched regularizing properties of discretization in a space of output signals for some linear operator equation with noisy data. The essence of proposed method is selection of discretization level which is a parameter of the regularization in this context by the principle of equality of random and deterministic components of the input signal recovering error. It is shown the method, i.e. the solution which is discrete by input signal is stable to small inaccuracies in input signal. At that in case of definite level of output signal measurements inaccuracy the recovering error of input signal is unambiguously defined by input signal sampling increment that allows to select reasonably the regularization parameter for specific criterion, for example, for definite measurements inaccuracy. Specific calculations and examples are represented in explicit form for single-dimension case but this does not restricts generality of proposed method.     

Study of the integral antigen of the membranes of fatty globules of human milk

The glycoprotein with the molecular weight of 82,500 D (Ag3) was extracted from the native membranes of fatty globules of human milk and was purified by isoelectrofocusing. Polyclonal antisera (PCA) as well as monoclonal antibodies (MoAb)-ICO-21, ICO-22, ICO-26, ICO-29 against this membrane antigen were produced. The localization of the antigen in the human normal and malignant tissues was tested by the immunochemical technique. Apical staining of the Ag3 was in the acinus and duct cells of the normal breast. Weak staining with the antibodies to Ag3 was revealed in the epithelium cells of ovaries, bronchi, kidney tubules and uterine tubes. The far more pronounced staining of the Ag3 with PCA and MCA was observed in the cell cytoplasma both in the primary and metastatic breast and ovarian tumours. The specificity of the MoAb to Ags suggests that they will be useful in the diagnosis of the malignant disease of the breast and ovary.     

Linear coefficients of equation of motion of a drift electron

A simple method of calculating the friction coefficient and the restraining coefficient of a linear equation of motion of a drift electron in an isotropic medium is presented. This new method is applied for an electron in the high-field domain in a magnetically biased Gunn diode as an example.     

汉语双音节中第一音节的元音共振峰轨迹研究

汉语中,协同发音主要取决于相邻前一音节末尾的元音,以及相邻后一音节首的辅音。主要考察在汉语普通话双音节中,第一音节元音韵母和不同第二音节声母组合时对第一个音节元音共振峰轨迹的影响。元音韵母选用元音三角形的3个顶点的元音,总结了轨迹变化的规律。     

激光解吸电离飞行时间质谱计的谱峰定标

研制了一套飞行时间质谱计（TOF）,能够同时或分别在电子碰撞电离（EBI）和激光解吸电离（LDI）两种机制下工作。利用EBI模式下得到的真空残气质谱图,对LDI模式下得到的TOF质谱峰进行了定标。通过在作为LDI靶材的金属基底表面添加碱金属卤化物的实验,证实了这种定标方法的可行性。     

In vivo lysis of tumor cells of varying degrees of immune resistance

Mouse tumour cell immune resistance in vitro and in vivo is compared. Cell lysis in the cytotoxic test was estimated in the first case, while the dynamics of elimination of the labelled 125I cells from the organism--in the second case. The lysis of cells in vitro and in vivo was found to correspond to 10 out of 11 studied cell lines of mouse tumours. However in spite of the similarity these methods are not identical, since there were cases when differences between certain cell lines were revealed in vitro but not in vivo, and vice versa.     

Quantitative evaluation of shape of image on photoresist of squareapertures

Simulation of images of two-dimensional structures in optical lithography is considered to have become quite important with the patterning of near-micrometer geometries in complex structures encountered in VLSI. Here, the results are presented of theoretical computations performed to calculate the aerial image of square apertures in a projection system using a partially coherent light source. The resist has been modeled by its sensitivity curve in order to compute the image profile on the resist after development. A figure of merit (FOM) has been proposed that quantifies the shape of the aerial as well as the resist image. Such an FOM has been proposed that can be used very effectively to optimize a lithographic process     

Investigation of accuracy of reconstruction of radio images with the use of multichannel radar system

The paper is devoted to inquiries in the level of noise on radio images and potential accuracy of estimation of reflected signal amplitudes. The work concerns methods of reconstruction of radio images in systems of active and passive location with a multichannel receiver in the “actual beam” mode of operation. Illustrations of operation of the image reconstruction algorithms are included.     

Classes of Frequencies Free of Mutual Interference: Elements of a Theory of Frequency Assignments

The mutual interference chart (MIC) gives the compatibility that exists between the channels of a radio set. This property of the chart is used to determine classes of frequencies that are compatible (in the sense of freedom from mutual interference) with given transmitting or receiving frequencies. The approach is based on the elementary theory of classes. It is shown that from the chart two categories of fundamental classes can be defined: those classes that contain undesired frequencies giving rise to interference in the presence of a given desired frequency and those classes that contain desired frequencies which in the presence of a given undesired frequency are subject to interference. The classes of compatible frequencies resulting from these definitions are determined for simple circuits containing one or more duplex channel terminals in various configurations. A set of classes characterizes each circuit; if the set is solved, it leads to classes of interference free frequencies for it. Some results obtained in the extension of the theory to more complex circuits are briefly mentioned. The logical extension of the results, surprisingly, lead to a relative simple solution of the problem of assignment.     

“自动控制原理”混合式教学实践

本文介绍了“自动控制原理”课程开展的线上线下混合教学模式改革实践。通过让学生自主学习线上的慕课教学资源,释放线下课堂教学的时间和内容,引导学生自主掌握学习节奏,体现“以学生为主体,教师为主导”的教学理念;同时结合“基于问题学习”的教学法,以问题为主线贯穿线上线下的各个环节,通过问题布置,问题讨论,汇报点评,帮助学生深入理解学习内容,灵活运用所学知识,增强分析问题解决问题的能力。本文还介绍了“自动控制原理”课实行线上线下混合教学模式的具体实现过程,对该方法在教学过程中的经验进行总结。     

Special features of photoelectric properties of nanostructured films of hydrogenated silicon

Nanostructured Si films differing in hydrogen content, in the forms of Si-H bonds, and in certain characteristics of Si inclusions in an amorphous matrix (volume fraction, size, and structure) were studied. The behavior common to all the studied films, i.e., an increase in the defect density and nonmonotonic enhancement of photoconductivity at the “red wing” of the spectral characteristic compared to a-Si:H, was assessed. At the same time, there are films with either enhanced or reduced photoconductivity compared to a-Si:H.     

红外焦平面探测器性能参数测量中g因子的计算

介绍了红外焦平面探测器性能参数测量中g因子的计算公式。分析并推导出了在理想相对光谱响应情况下,光子探测器及热探测器在受到器件窗口材料所限时g因子的计算公式。举例说明了光子探测器在理想相对光谱响应情况下g因子的计算结果,并与通过实际光谱相对响应计算得到的g因子值进行了比较,它们之间的典型偏差小于5%。因此在一般的红外焦平面器件性能参数测量中,可以通过用理想情况下的g因子值取代实际情况下的g因子值来计算峰值探测率等参数。这种方法相对简单和快捷,且不需要进行实际的相对光谱响应测量。     

Role of protein receptors of Vitamin A in the mechanism of antitumor action of retinoids

Data on protein receptors of vitamin A participating in retinoid metabolism, storage, transport and action are presented. Information about cytosolic protein receptors of vitamin A exerting hormone-like action on the cell proliferation and differentiation is considered in detail. Data concerning the presence of protein receptors in normal and tumour tissues, correlation between protein receptors and biological retinoid effect are analyzed. A hypothetic model of the binding protein mode of action in target cells related to the action model of steroid hormones is described. The authors' own data on action of vitamin A and steroid hormones on the level of estrogen and progesterone receptors in the rate of mammary cancer are reviewed.     

过渡圆角对工字型钢结构温度场影响的仿真

借助Ansys有限元分析软件,对工字型钢结构加热过程进行了有限元模拟,研究了加热过程中的热边界条件,分析了温度场的分布及其变化.对比有无过渡圆角的工字型钢结构,在升温过程的温度分布情况,结果表明它们的温度分布场是不同的.分析结果对于掌握工字型钢结构的加热过程温度变化、分析残余应力具有实际指导意义.     

山东联通物联网业务发展探讨

从物联网概念、物联网产业链现状以及国内外物联网主要运营商物联网发展状况进行分析,总结电信运营商在物联网业务发展过程中所面临的挑战,提出山东联通发展物联网业务的发展思路:既搭建物联网业务运营支撑平台,又有选择性地发展物联网行业应用。