RFID Anti-Counterfeiting for Retailing Systems

Counterfeiting is one of the most serious problems in the consumer market. One promising approach for anti-counterfeiting is to attach a low-cost Radio-frequency Identification (RFID) tag to the product authentication. In this paper, we propose an RFID system for detecting counterfeiting products. This RFID system consists of the tag authentication protocol and the database correction protocol. We use the tag authentication protocol for authenticating tags without revealing their sensitive information. This protocol also allows the customer to freely inquire the tag. To prevent the widespread of the counterfeit products, we use the tag status information along with tag identity information. Meanwhile, the database correction protocol guarantees the correctness of the tag status. Our anti-counterfeiting system is the first work considering the seller who plays an important role in the consumer product supply chain. Finally, we show that anti-counterfeiting system is quite secure against counterfeiting and the tag authentication protocol is lightweight enough to be implemented in RFID-based applications.

有机-无机杂化材料动力学与热力学转化以及荧光信息防伪应用研究——介绍一个综合化学实验

有机-无机杂化发光材料易于调控的空间结构和发光性质,在发光防伪领域备受青睐。本实验基于Sb(Ⅲ)掺杂Bi(Ⅲ)基零维有机-无机杂化金属卤化物,利用不同的晶体生长方式实现动力学产物(化合物1)向热力学产物(化合物2)的转变,采用X-射线粉末衍射和荧光光度法分别对其进行了物相表征和光学性能测试,二者表现出截然不同的物相与光物理性质。化合物2在蒸馏水的作用下实现荧光淬灭,而且具有很强的反水性。基于化合物2出色的发光变色性质,制作了简易的可水写荧光信息防伪板/纸。本实验充分体现了“结构决定性质”的专业理论、“学以致用”的教学理念。该实验设计与实践旨在培养学生创新思维,提高其分析和解决实际问题的能力。

Field-Deployable Raman Anti-Counterfeit Screening of Tamiflu Capsules

In an effort to promote the availability of safe and effective drugs, the US Food and Drug Administration is developing spectroscopic methods to assess the quality of drugs in the field. Here we report a rapid screening classification method for Tamiflu (oseltamivir phosphate) capsules using a portable Raman spectrometer to perform screening on three solid oral dosage strengths of Tamiflu, 30 mg, 45 mg and 75 mg. Tamiflu is an antiviral drug that is stockpiled for use in the event of pandemic influenza outbreak. The qualitative classification methods reported were developed using the Raman spectra of intact capsules. The classification algorithms used were able to reliably distinguish the three dosage strengths of Tamiflu. These qualitative models are validated with additional Tamiflu samples from different batches and simulated counterfeits of Tamiflu. The probability that a test sample belongs to each dosage strength class is calculated, and strict class predictions are used to assign each sample to a particular class. The classification methods reported here enable development of user-independent, field-deployable methods for finished drug products and are able to correctly assign 92% of the validation samples using authentic Tamiflu and 100% of the simulated counterfeits.

THE STUDY OF UV-PHOTOCHROMIC ANTI-COUNTERFEIT PAPER

The hydrophilicity, dispersity and minuteness of UV (ultraviolet)-photochromic special function materials and its retention and formation mechanisms in stock were comprehensively studied, and the retention mechanism of UV-photochromic fiber was also studied. In addition, according to the disadvantages of special function materials such as big grain, bad hydrophilicity, expensive price and so on, this paper displays our effects focused on the developing of anti-counterfeit pigments slurry system. Moreover, the properties and anti-counterfeit mechanism of the paper with different special function materials were researched by fluorescent spectrum.

刺激响应性有机-无机杂化溴氯化亚铜的制备

介绍了一个多刺激荧光响应有机-无机杂化溴氯化亚铜的制备、表征及性能测试的大学化学综合性实验。内容包括:有机-无机杂化溴氯化亚铜的制备,结构表征,以及对紫外(UV)光、水和热刺激发光性能的测试。本实验合成方法具有能耗低、操作简单快速、成本低的优点。学生通过本实验可以掌握溶液法的物理化学原理,提高基本实验技能,激发学生科学研究的兴趣,培养学生分析、解决实际工程问题和项目开发的能力。

基于3,5-二溴水杨醛席夫碱镍配合物-氧化石墨烯电化学免疫传感器检测Anti-IgG含量的研究

应用物理吸附法将羊抗人IgG抗原直接固定于3,5-二溴水杨醛席夫碱镍配合物-氧化石墨烯修饰的金电极表面,制备电化学免疫传感器。采用循环伏安法和交流阻抗法对传感器进行表征,结果表明该传感器适合检测Anti-IgG浓度。同时探讨了缓冲液pH值、扫描速度、免疫反应温度、抗原与抗体配比对循环伏安峰电流的影响,结果表明在5-100mV/s扫速范围内,峰电流与扫速呈线性。孵育最优条件为25℃,h-IgG与Anti-IgG配比为1∶1。循环伏安法研究还表明Anti-IgG浓度在0.01-260μg/L范围内,线性关系良好,相关系数r^2=0.993,检出限（S/N=3）为0.006μg/L,据此建立了检测Anti-IgG浓度的新方法。

信号分子IRAK1/4在antiβ-2GPI/β2GPI复合物诱导THP-1细胞表达TF中的作用探讨

目的:探讨IRAK1和IRAK4在antiβ-2GPI/β2GPI复合物诱导单核细胞株THP-1表达组织因子(TF)中的作用。方法:利用荧光定量PCR(Real-time PCR)、TF活性试剂盒分别检测THP-1细胞表达TF mRNA及TF活性;Western blot检测anti-β2GPI/β2GPI复合物诱导THP-1细胞表达IRAK1、磷酸化-IRAK1(p-IRAK1)、IRAK4情况;观察IRAK1/4抑制物是否干预anti-β2GPI/β2GPI复合物诱导THP-1表达TF。结果:Antiβ-2GPI/β2GPI复合物(100μg/ml)诱导THP-1细胞表达TF显著增加(P<0.05 vs control);Antiβ-2GPI/β2GPI复合物(100μg/ml)刺激THP-1细胞表达IRAK1、p-IRAK1、IRAK4(蛋白)显著升高(P<0.05 vscontrol);IRAK1/4抑制物(50μmol/L)能够阻断antiβ-2GPI/β2GPI复合物(100μg/ml)诱导THP-1表达TF及IRAK1磷酸化的效应。结论:antiβ-2GPI/β2GPI复合物诱导THP-1细胞表达TF过程中,信号分子IRAK1/4被激活进而发挥重要作用。

三维Anti de Sitter空间中Lorentzian曲面的S_t^1×S_s^1-值光锥Gauss映射的奇点分类

利用Arnol'd的Legendrian理论,对三维Anti de Sitter空间中Lorentzian曲面进行了研究.引入光维高度函数概念研究了三维Anti de Sitter空间Lorentzian曲面的S1t×S1s-值、光锥Gauss映射的奇点,进行了奇点分类,揭示了类光Causs-kronecker曲率之间的关系;并研究了Lorentzian曲面的一些基本几何性质.

On the Construction of Deepening Anti - corruption Mechanism

It needs the foundation of system and the guarantee of organizational system for anti-corruption,but it is more necessary to build and form an effective anti-corruption mechanism,so that the anti-corruption can be really put into practice. Anti-corruption mechanism refers to a organic operation system of the interaction,interconnection and constraint between the constituent elements( parts) and elements of national anti-corruption,and as a system,anti-corruption mechanism should have the characteristics of system aticness,comprehensiveness,transparency,legalization,public participation,scientific dynam ic,and internationalism. The construction of deepening anti-corruption mechanism is the need for reconstructing the ruling legitimacy of the party and the governm ent. Adhering to the principle of treating both root causes and symptoms is necessary in the construction of anti-corruption m echanism,com bating and punishing corruption is an important part of anti-corruption,and the prevention and control of corruption is the basic project of anti-corruption. Therefore,the construction of prevention and control mechanism in the anti-corruption mechanism has a more far-reaching significance.

基于超声剥离3D超分子晶体的微米级Eu-MOF颗粒制备及其在防伪中的应用

设计了一种3D超分子结构,用于通过超声剥离制备微米级Eu-MOFs颗粒.由于2D层状Eu-MOFs表面存在大量DMF配位分子,其在油墨中具有良好的分散性.微米尺寸的Eu-MOFs表现出优异的流变性能,因此它们很容易与油墨或印泥基材结合成荧光油墨或印泥,表现出优异的稳定性.荧光油墨和印泥通过丝网印刷和指压加工出荧光图案,荧光图案在自然光下观察不到任何痕迹,在紫外光下则清晰可见,并发出明亮的红光.具有Eu^(3+)发光的独特2D层状Eu-MOFs可使其广泛应用于防伪领域.

Anti-Bacterial and Flame Retardant for Cotton Fabric by One-Bath Finishing

A research on the process of cotton fabric flame-re-tarding,anti-bacterial finishing and one-bath finish-ing of anti-bacterial and flame-retarding is discussed.The flame retardant agent was phosphorous-contained,and the bacteriostatic finishing agent named SFR-1 wassynthesized.The flame retardancy of the fabric finishedcan meet the DOC FF3-71 Children Sleepwear Stan-dard.Its bacterial inhibiting capacity can meet and ex-ceed the requirements of similar products

Testing of Anti-stripping Property of Friction Spun Core Yarn

Friction spun core yarn has two components: filament core and staple fiber sheath. Under axial rubbing action, the failure mode of the core yarn is the stripping of the sheath from the core. This paper introduces a method to test the anti - stripping property of the core yarn. With a modified Universal Testing Machine, the stripping resistance of friction spun core yarn can be continuously measured. Some factors Influencing the measurements are discussed in detail. The testing results are compared with those from a Y731 Yarn Abrasion Tester and fur - ther confirmed by weaving practice.

纸张数字化图像处理与信息识别系统设计研究

针对纸张信息识别领域的图像处理技术进行研究,可构建出一种纸张数字化图像处理与信息识别的系统,具体可从软件、硬件两方面对该系统进行分析。将数字化图像处理技术与信息识别两者结合可从纸张中获取有效的防伪信息,并对纸张进行真假辨识,不仅可降低人工误检的现象,还可使检测的工作效率得到提升,而且适合数字化信息管理,同时可降低个人与企业的经济损失,符合现代社会的发展需求,有着重要的现实意义。

酸皮基磷光型碳点的制备及防伪应用

以浸酸山羊皮为碳源、硼酸为硼源,采用热解法制备了磷光型碳点(P-CDs)。探讨了浸酸山羊皮含量、反应pH、反应温度和反应时间对P-CDs余辉时间的影响。采用有机元素分析仪、SEM、EDS、TEM、FTIR、XRD对样品进行了表征,并评价了P-CDs的防伪应用。结果表明,在浸酸山羊皮含量(以3 g硼酸为基准,下同)4.10%、反应pH为7、反应温度为225℃、反应时间为7.5 h的条件下,制备的P-CDs的余辉时间达到12s;该材料的最佳发射波长为520 nm,对应明亮的青绿色余辉。P-CDs平均粒径为4.42 nm,具有典型的石墨结构,硼原子成功地掺入到碳点中,形成了C—B、B—O等共轭链结构,稳定了三重激发态,延长了余辉时间。

基于光充能的多重荧光安全防伪织物的研究

SrS∶Eu,Sm具有红外响应频带宽、效率高等特点,是一种理想的上转换荧光防伪材料。以高温固相法和共沉淀法规模化制备出SrS∶Eu,Sm和NaYF4∶Yb,Er上转换荧光粉(SrS-NaYF4UCPs),通过共混后丝网印刷得到具有多波段、宽频带响应的安全防伪织物,织物经过日光下充能后在980nm激发光下印刷图案会逐渐变色发光,在850nm红外摄像头及智能手机红外镜头下可响应发光。通过扫描电子显微镜、X射线衍射仪和荧光光谱仪等多种表征手法,对所制备荧光粉结构、形貌以及发光性能进行了表征,证明了该织物在防伪、防偷拍领域广阔的应用前景。

溶剂依赖型碳点的制备及水含量检测和防伪应用

以二苯氨基-4-苯甲醛和邻苯二胺为前驱体,乙醇为溶剂,采用溶剂热法合成了具有高量子产率(QY=87.76%)的氮掺杂荧光碳点(N-CDs)。通过对有机溶剂和水溶液中N-CDs光学性质的考察,表明N-CDs具有良好的溶剂依赖性和化学稳定性。水的加入在N-CDs中构建氢键网格,从而实现了发射波长的红移,N-CDs溶液由蓝色变为黄色。进一步,基于N-CDs荧光试纸蓝色到黄色的可逆颜色变化,制备便携的空气湿度可视化检测试纸。此外,N-CDs还可用于荧光墨水、书写纸和荧光柔性薄膜,拓展了其在信息传递,高级防伪加密和固态荧光的应用。

Mg_(3)Y_(2)Ge_(3)O_(12)∶Pr^(3+)材料的多色发光及余辉性能

采用高温固相法制备了一种具有颜色变化的长余辉发光材料Mg_(3)Y_(2)Ge_(3)O_(12)∶Pr^(3+)。通过X射线衍射、激发发射光谱、余辉衰减及热释光曲线等,对样品的结构、发光及余辉性能进行了系统分析。在283 nm激发下,发射光谱在485 nm和609 nm处表现出两个较强的尖峰发射,分别归属于Pr^(3+)离子的^(3)P_(2)→^(3)H_(4)及^(3)P_(0)→3H6能级跃迁。通过对Pr^(3+)离子浓度的调控,有效改变了绿光和红光的相对发射强度,从而实现了发光颜色的多色化。此外,在激发光源停止后该材料同样具有多色的余辉发射,对于最佳样品(Mg_(3)Y_(2)Ge_(3)O_(12)∶0.015Pr^(3+))的余辉时间可达1200 s以上。之后,我们通过热释光曲线具体研究了陷阱的分布及余辉的充放能过程。结果表明,Mg_(3)Y_(2)Ge_(3)O_(12)∶0.015Pr^(3+)材料中浅陷阱的浓度相对较低从而导致室温下的余辉性能较弱。由于材料在高温区域具有超宽带陷阱分布,因此,我们进一步探究了其在高温下的多色长余辉性能。在本工作中,我们成功制备了一种单一离子激活的发光及余辉颜色可调的长余辉发光材料,考虑到其在室温以及高温条件下都具有发光及余辉颜色变化的特点,该材料在高温预警标识以及防伪领域有着潜在的应用价值。

杂质Mn^(4+)发光中心相关的Mg_(7)Ga_(2)GeO_(12)∶Tb^(3+)多色荧光粉发光性能

高性能稀土掺杂多色荧光材料的研发是发展先进荧光防伪技术的必要基础。本文通过高温固相法制备了一系列Tb^(3+)掺杂Mg_(7)Ga_(2)GeO_(12)荧光粉,并利用X射线衍射仪(XRD)、扫描电镜(SEM)和能量色散X射线光谱(EDS)对荧光粉的物相、颗粒尺寸与微观形貌、元素分布进行了系统表征,证实制得了结晶度良好的无规则微米级纯相荧光粉。在紫外377 nm激发下,Mg_(7)Ga_(2)GeO_(12)∶Tb^(3+)样品产生高效的Tb^(3+)蓝绿光特征发射,并具有20%Tb^(3+)最佳掺杂浓度,但同时还可发射峰值位于660 nm红光,其并不对应于Tb^(3+)离子的任何辐射跃迁。经电感耦合等离子体质谱(ICP-MS)和稳态/瞬态光谱分析,以及结合文献调研,证实红光~660 nm源于Mn^(4+)^(2)Eg→^(4)A_(2g)电子跃迁发射,Mn杂质元素来自于原材料。综合Tb^(3+)离子和Mn^(4+)杂质离子荧光性能,Mg_(7)Ga_(2)GeO_(12)∶Tb^(3+)样品具有200~420 nm范围内激发波长依赖的发光可调谐特性,可实现青、绿、黄、白、红等可视化多色显示效果,有望应用于多色荧光防伪与调控技术。

基于光学辐照方法调控荧光光强及显色性

随着信息技术的发展,产品防伪和信息保护已成为许多行业密切关注的问题,研发防伪复杂度高的光学防伪材料受到研究人员越来越多的关注。选用Er^(3+)掺杂Ca_(2)SnO_(4)基体,发现Er^(3+)掺杂将占据4h位阳离子位置,在提升材料的光学性能过程中,具有两方面的作用。一方面,Er^(3+)作为发光中心,380 nm激发下,分别产生以550 nm为主峰的绿光发射和以671 nm为主峰的红光发射。另一方面,非等价的取代掺杂在材料中引入缺陷陷阱捕获载流子形成色心,有助于材料具备光致变色能力。在UV光源辐照后,材料的光致发光光强和荧光寿命表现出衰减调制现象。同时,材料的荧光显色参数如CIE色度坐标、色纯度、相关色温也会因UV光源辐照被调控。最后,借助能量传递理论,分析得到由发光中心向色心的能量传递是材料荧光调控现象产生的原因。上述研究表明通过外部光源照射的方式能够对Er^(3+)掺杂Ca_(2)SnO_(4)荧光光强及显色性产生调控,在光学防伪领域具有应用潜力。

用于信息存储与防伪的动态荧光防冻水凝胶

目的 为了提高水凝胶在恶劣环境下的适应能力,探究在信息存储与防伪中的应用前景,本次研究制备一种荧光聚合物水凝胶,提高水凝胶的机械稳定性、保湿性、多环境稳定特性,以及实现将代码信息隐藏在水凝胶内部的测试。方法 在70℃下将羧甲基纤维素钠(CMC)溶于水/二甲基亚砜(DMSO)体系,并在此基础上添加丙烯酸、丙烯酰胺、丙烯酸-2甲氧基乙酯等,用荧光溶液书写特定图案,最后将混合溶液进行紫外光固化,宏观上利用万能试验拉伸机、差式扫描量热仪对其进行力学与防冻性能表征;在微观上使用傅里叶红外光谱、扫描电子显微镜对其内部物质与形貌特征进行描述。结果 结果表明,水/DMSO体系可以提高低温下凝胶的力学性能;其次,制备得到的透明水凝胶在水浸泡下会出现溶胀现象,然后在DMSO溶液中恢复透明,利用这一现象可以实现荧光信息的隐藏与加密。结论 利用水凝胶在不良溶剂中的微相分离和有机溶剂中的溶胀现象,将荧光图案隐藏在其中,溶胀时紫外光下不显示信息,待恢复透明时信息可见,使其在信息加密领域具有广阔的应用前景。