非冲击式印刷及其新发展

介绍了非冲击式印刷方法的分类、简单的成像原理和应用范围及其在数字化彩色印刷体系中的作用；着重叙述了电子照相、喷墨印刷和热敏记录材料方面的最新发展；对我国非冲击式印刷技术的现状也进行了评述。     

乐凯二胶推出国内首款免处理热敏CTP版材

乐凯二胶在第五届中国（北方）国际印刷及设备器材展览会上展出了该公司推出的TP—G免化学处理热敏版材。据介绍，这种版材采用的是热相变成像技术，这种技术对于热敏CTP设备的激光头不会造成粉尘污染，曝光完成后只需用水进行冲洗。     

聚氨酯／环氧树脂互穿网络聚合物相行为与断裂拉伸强度

制备了一系列聚氨酯／环氧树脂互穿网络聚合物ＰＵ／ＥＰＩＰＮ，由ＤＳＣ，ＴＭＴ和动态粘弹仪研究表明，ＩＰＮ在高温区存在的单一玻璃化转变温度Ｔｇ，ＩＰＮ的的相行为与其断裂伸强度的相关，并确认接枝共聚物的存在增强了ＩＰＮ的互穿效应。     

聚氨酯／环氧树脂互穿网络聚合物相行为与粘接剪切性…

制备了一系列聚氨酯／环氧树脂互穿聚合物网络ＰＵ／ＥＰ ＩＰＮｓ，由ＤＣＳ、ＴＭＡ和ＤＤＶ研究表明，ＩＰＮｓ在高温区存在单一的玻璃化转变温度，Ｔｇ，ＩＰＮｓ的相行为与其粘接剪切强度相关，并确认接枝共聚物的存在增强了ＩＰＮｓ的互穿效应。     

聚氨酯／环氧树脂互穿网络聚合物相行为与粘接剪切性能的研究

制备了一系列聚氨酯／环氧树脂互穿聚合物网络ＰＵ／ＥＰＩＰＮｓ。由ＤＳＣ、ＴＭＡ和ＤＤＶ研究表明，ＩＰＮｓ在高温区存在单一的玻璃化转变温度Ｔｇ，ＩＰＮｓ的相行为与其粘接剪切强度相关。并确认接枝共聚物的存在增强了ＩＰＮｓ的互穿效应     

NIPA/DMAA共聚物及其水溶液相转变温度的研究EI

合成了不同配比的Ｎ－异丙基丙烯酰胺（ＮＩＰＡ）／Ｎ，Ｎ－二甲基丙烯酰胺（ＤＭＡＡ）共聚物并用红外光谱对它们进行了验证。ＤＳＣ分析表明，共聚物的Ｔｇ随ＮＩＰＡ含量逐渐增大先是显著升高，当ＮＩＰＡ含量为４６．５ｍｏｌ％时，Ｔｇ达１３２℃，随后共聚物的Ｔｇ仅有微小的升高。共聚物水溶液的相转变温度比ＰＮＩＰＡ均聚物高，当ＮＩＰＡ的含量为４６．５ｍｏｌ％时，共聚物的雾点温度高达５１．６℃，我们认为这是因为共聚物分子链的疏水性较ＰＮＩＰＡ均聚物分子链的低所致。     

柯达举行克里奥首创热敏CTP十周年庆祝活动

11月22日，柯达“克里奥首创热敏CTP十周年”活动在北京举行。 从克里奥1995年在德鲁巴展会上首次推出热敏CTP，到1996年第一台热敏成像系统的面世，十载寒暑，克里奥在全球已成功安装1000台CTP，全球占有量名列第一。这一傲人的成绩让我们热敏技术的发展充满了憧憬。     

环氧树脂/聚氨酯半互穿网络聚合物的研究Ⅰ.玻璃化转变行为及其形态结构

用分步法制备了环氧树脂／聚氨酯（ＥＰ／ＰＵ）半ＩＰＮ，通过差示扫描量热法（ＤＳＣ）与动态力学分析法（ＤＭＡ）研究了该半ＩＰＮ的玻璃化转变行为，用扫描电镜（ＳＥＭ）表征了其形态结构。结果表明，在此半ＩＰＮ中，两组分聚合物的玻璃化转变温度（Ｔｇ）靠近，并伴随有第三个Ｔｇ的出现。该半ＩＰＮ具有两相结构，两相连续程度随组分量的变化而变化。     

环氧树脂/聚氨酯半互穿网络聚合物的研究:I.玻璃化转变行为…EI

用分步法制备了环氧树脂／聚氨酯（ＥＰ／ＰＵ）半ＩＰＮ，通过差示扫描量热法（ＤＳＣ）与动态力学分析法（ＤＭＡ）研究了该半ＩＰＮ的玻璃化转变行为，用扫描电镜（ＳＥＭ）表征了其形态结构，结果表明：在此半ＩＰＮ中，两组分聚合物的玻璃化转变温度（Ｔｇ）靠近，并伴随前第三个Ｔｇ的出现。该半ＩＰＮ具有两相结构，两相连续程度随组分量的变化而变化。     

一种医用干式非银热敏威像输出系统

本文介绍了热敏干式非银胶片的组成结构、成像原理,以及热敏干式非银胶片与干式成像仪所组成热敏成像输出系统的特点及成像质量。     

Development of piroxicam sensor based on molecular imprinted polymer-modified carbon paste electrode

A new voltammetric sensor for piroxicam measurement is introduced. A piroxicam-selective molecularly imprinted polymer (MIP) and a non-imprinted polymer (NIP) were synthesized in a non-covalent approach using methacrylic acid (MAA) as functional monomer and ethylene glycol dimethacrylate (EGDMA) as cross-linking monomer via a free radical polymerization and then was used for carbon paste (CP) electrode preparation. The MIP, embedded in the carbon paste electrode, functioned as a selective recognition element and pre-concentrator agent for piroxicam determination. The prepared electrode was used for piroxicam measurement via a three-step procedure including analyte extraction in the electrode, electrode washing and electrochemical measurement of piroxicam. The MIP–CP electrode showed good recognition ability in comparison to NIP–CP. Some parameters affecting sensor response were optimized. Under optimum conditions the oxidation peak current was proportional to piroxicam concentration over the range 2–190 and 190–2500 nM. The detection limit was found to be 0.5 nM. This sensor has been successfully applied for the determination of piroxicam in pharmaceutical formulations and serum samples.     

LiF crystals as high spatial resolution neutron imaging detectors

Neutron imaging by color center formation in LiF crystals was applied to a sensitivity indicator (SI) as a standard samples for neutron radiography. The SI was exposed to a 5 mm pinhole-collimated thermal neutron beam with an LiF crystal and a neutron imaging plate (NIP) for 120 min in the JRR-3M thermal neutron radiography facility. The image in the LiF crystal was read out using a laser confocal microscope. All gaps were clearly observed in images for both the LiF crystal and the NIP. The experimental results showed that LiF crystals have excellent characteristics as neutron imaging detectors in areas such as high spatial resolution.     

Flow-based method for epinephrine determination using a solid reactor based on molecularly imprinted poly(FePP–MAA–EGDMA)

A solid phase reactor based on molecularly imprinted poly(iron (III) protoporphyrin-methacrylic acid-ethylene glycol dimethacrylate) (MIP–MAA) has been synthesized by bulk method and applied as an selective material for the epinephrine determination in the presence of hydrogen peroxide. In order to prove the selective behaviour of MIP, two blank polymers named non-imprinted polymer (NIP1), non-imprinted polymer in the absence of hemin (NIP2) as well as a poly(iron (III) protoporphyrin-4-vynilpyridine-ethylene glycol dimethacrylate) (MIP–4VPy) were synthesized. The epinephrine-selective MIP–MAA reactor was used in a flow injection system, in which an epinephrine solution (120 μL) at pH 8.0 percolates in the presence of hydrogen peroxide (300 μmol L^? 1) through MIP–MAA. The oxidation of epinephrine by hydrogen peroxide is increased by using MIP–MAA, being the product formed monitored by amperometry at 0.0 V vs. Ag/AgCl. The MIP–MAA showed better selective behaviour than NIP1, NIP2 and MIP–4VPy, demonstrating the effectiveness of molecular imprinting effect. Highly improved response was observed for epinephrine in detriment of similar substances (phenol, ascorbic acid, methyl-l-DOPA, p-aminophenol, catechol, l-DOPA and guaiacol). The method provided a calibration curve ranging from 10 to 500 μmol L^? 1 and a limit of detection of 5.2 μmol L^? 1. Kinetic data indicated a value of maximum rate V_max (0.993 μA) and apparent Michaelis–Menten constant of K_m^app(725.6 μmol L^? 1). The feasibility of biomimetic solid reactor was attested by its successful application for epinephrine determination in pharmaceutical formulation.     

Adsorption on molecularly imprinted polymers of structural analogues of a template. Single-component adsorption isotherm data

The equilibrium adsorption isotherms on two otherwise identical polymers, one imprinted with Fmoc-L-tryptophan (Fmoc-L-Trp) (MIP), the other nonimprinted (NIP), of compounds that are structural analogues of the template were acquired by frontal analysis (FA) in an acetonitrile/acetic acid (99/1 v/v) mobile phase, over a wide concentration range (from 0.005 to 50 mM). These analogues were Fmoc-L-tyrosine, Fmoc-L-serine, Fmoc-L-phenyalanine, Fmoc-glycine (Fmoc-Gly), Fmoc-L-tryptophan pentafluorophenyl ester (Fmoc-L-Trp(OPfp)), and their antipodes. These substrates have different numbers of functional groups able to interact with the 4-vinylpyridine groups of the polymer. For a given number of the functional groups, these substrates have different hydrophobicities of their side groups (as indicated by their partition coefficients (log P(ow)) in the octanol-water system (e.g., from 4.74 for Fmoc-Trp to 2.53 for Fmoc-Gly)). Statistical results from the fitting of the FA data to Langmuirian isotherm models, the calculation of the affinity energy distribution, and the comparison of calculated and experimental band profiles show that all these sets of FA data are best accounted for by a tri-Langmuir isotherm model, except for the data of Fmoc-L-Trp(OPfp) that are best modeled by a simple Langmuir isotherm. So, all compounds but Fmoc-L-Trp(OPfp) find three different types of adsorption sites on both the MIP and the NIP. The properties of these different types of sites were studied systematically. The results show that the affinity of the structural analogues for the NIP is controlled mostly by the number of the functional groups on the substrates and somewhat by the hydrophobicity of their side groups. These two factors control also the MIP affinity toward the enantiomers of the structural analogues that have a stereochemistry different from that of the template. In contrast, the affinity of the highest affinity sites of the MIP toward the enantiomers of these structural analogues that have the same stereochemistry as the template is highest for the imprinted molecule (Fmoc-L-Trp). The separation of the template from the substrates with the same stereochemistry is influenced by the number of the functional groups on the substrates that can interact with the highest affinity sites on the MIP. The separation of the enantiomers of the analogues of the substrates was also achieved on the MIP, and these enantiomeric separations are influenced by the hydrophobicity of the substrates.     

Extraction and purification of penicillin G from fermentation broth by water-compatible molecularly imprinted polymers

Highly selective molecularly imprinted polymer (MIP) was synthesized by using methacrylic acid as functional monomer, trimethylolpropane trimethacrylate as cross-linker, chloroform as porogen and penicillin G potassium as template molecule. These imprinted polymers were used as solid-phase extraction sorbent for the selective extraction of penicillin G from the fermentation broth samples. Various parameters affecting the extraction efficiency of the MIP particles such as; effects of pH, wash and eluent solutions were evaluated. Molecular recognition properties and selectivity of these MIPs were estimated and the obtained results revealed high affinity for the target antibiotic. Equilibrium binding experiments were done to assess the performance of the MIP relative to non imprinted polymer (NIP). After optimizing the extraction parameters in molecularly imprinted solid-phase extraction (MISPE), successful imprinting was confirmed by comparison of the recoveries from the fermentation broth, ranging between 24–26% (RSD 4.1–4.5%, n = 4) for the NIPs and 83–88% (RSD 3.1–3.4%, n = 4) for the MIPs.     

Preparation of nano-sized Pb2+ imprinted polymer and its application as the chemical interface of an electrochemical sensor for toxic lead determination in different real samples

In this work, a new nano-structured ion imprinted polymer (IIP) was synthesized by copolymerization of methacrylic acid-Pb(2+) complex and ethylene glycol dimethacrylate according to the precipitation polymerization. Methacrylic acid acted as both functional monomer and complexing agent to create selective coordination sites in a cross-linked polymer. A carbon paste electrode modified with IIP-nanoparticles was used for fabrication of a Pb(2+) sensitive electrode. Differential pulse stripping voltammetry method was applied as the determination technique, after open circuit sorption of Pb(2+) on the electrode and its reduction to metallic form. The IIP modified electrode showed a considerably higher response, compared to the electrode embedded with non-imprinted polymer (NIP). This indicated that the suitable recognition sites were created in the IIP structure in the polymerization stage. Various factors, effective on the response behavior of the electrode, were investigated and optimized. The introduced sensor showed a linear range of 1.0 × 10(-9) to 8.1 × 10(-7)M and detection limit of 6.0 × 10(-10)M (S/N=3). The sensor was successfully applied for the trace lead determination in different samples.     

Classification performance comprehensive evaluation of an air classifier based on fuzzy analytic hierarchy process

The classification performance evaluation goal for an air classifier is usually limited to one of the classification performance indices including cut size, classification precision, Newton classification efficiency and degree of dispersion. This method hardly evaluates these performance indices of an air classifier comprehensively and suitably. In order to evaluate the classification performance truly and synthetically, Fuzzy Analytic Hierarchy Process is used to calculate the weights of the classification performance indices after determining the hierarchical model in the present paper. The dimensionless transformation eliminates the effect of the different dimensions. Then, the comprehensive evaluation value of the classification performance for each experiment is obtained using the linear weighted method. The maximum value corresponds to the best classification performance among these evaluation values. In the present study, a turbo air classifier is used as the classification system and talc powders are used as materials. The best classification performance indices are a cut size of 16.5 μm, a classification precision of 0.59, a Newton classification efficiency of 57%, and a degree of dispersion of 2.13. The corresponding optimal operational parameter combinations are: the feeding speed is 40 kg·h^–1, the air inlet velocity is 5 m·s^–1 and the rotor cage's rotary speed is 1200·min^–1. This assessment method avoids the limitation of evaluating a single classification performance index and the incomplete information derived from single factor experiments. Furthermore, the method also provides quantitative evaluation criteria for the classification performance of an air classifier. In the proposed method, the classification performance indices can be selected and the precedence relation matrix of Fuzzy Analytic Hierarchy Process can be set flexibly according to production requirements.     

基于卷积神经网络模型的遥感图像分类

研究了遥感图像的分类,针对遥感图像的支持向量机(SVM)等浅层结构分类模型特征提取困难、分类精度不理想等问题,设计了一种卷积神经网络(CNN)模型,该模型包含输入层、卷积层、全连接层以及输出层,采用Soft Max分类器进行分类。选取2010年6月6日Landsat TM5富锦市遥感图像为数据源进行了分类实验,实验表明该模型采用多层卷积池化层能够有效地提取非线性、不变的地物特征,有利于图像分类和目标检测。针对所选取的影像,该模型分类精度达到94.57%,比支持向量机分类精度提高了5%,在遥感图像分类中具有更大的优势。     

EEG-Based Neonatal Sleep Stage Classification Using Ensemble Learning

Sleep stage classification can provide important information regarding neonatal brain development and maturation. Visual annotation, using polysomnography (PSG), is considered as a gold standard for neonatal sleep stage classification. However, visual annotation is time consuming and needs professional neurologists. For this reason, an internet of things and ensemble-based automatic sleep stage classification has been proposed in this study. 12 EEG features, from 9 bipolar channels, were used to train and test the base classifiers including convolutional neural network, support vector machine, and multilayer perceptron. Bagging and stacking ensembles are then used to combine the outputs for final classification. The proposed algorithm can reach a mean kappa of 0.73 and 0.66 for 2-stage and 3-stage (wake, active sleep, and quiet sleep) classification, respectively. The proposed network works as a semi-real time application because a smoothing filter is used to hold the sleep stage for 3 min. The high-performance parameters and its ability to work in semi real-time makes it a promising candidate for use in hospitalized newborn infants.