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羚羊角与其人工伪制品的鉴别 被引量:3
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作者 何志刚 郑涛 《成都中医药大学学报》 2002年第4期50-51,共2页
对羚羊角及其人工伪制品进行药材性状、显微鉴别方面的鉴别比较。结果表明 :人工伪制羚羊角外形与正品羚羊角相似 ,但两者间药材性状和显微特征仍有不同。其主要鉴别特征是羚羊角具“通天眼” ,“骨塞”约占全长的 2 / 3,而人工伪制品... 对羚羊角及其人工伪制品进行药材性状、显微鉴别方面的鉴别比较。结果表明 :人工伪制羚羊角外形与正品羚羊角相似 ,但两者间药材性状和显微特征仍有不同。其主要鉴别特征是羚羊角具“通天眼” ,“骨塞”约占全长的 2 / 3,而人工伪制品无“通天眼”“骨塞”约占全长的 1/ 2 0。羚羊角表面比较粗糙。而人工伪制品表面光滑 。 展开更多
关键词 羚羊角 人工羚羊角 性状 显微鉴别
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伪制红薯粉条中非法添加3种合成色素的检测方法 被引量:2
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作者 符春花 吴泽君 +3 位作者 林芳 刘水平 包敏 刘芳 《食品与发酵工业》 CAS CSCD 北大核心 2017年第10期234-240,共7页
建立了二极管阵列高效液相色谱法(HPLC-DAD)及高效液相色谱-串联质谱法(HPLC-MS/MS)测定伪制红薯粉条中非法添加人工合成色素柠檬黄、日落黄、亮蓝的检测方法。样品经粉碎后加0.25 mL氨水(氨水和水体积比为1∶1)、50 mL水涡旋2 min,超声... 建立了二极管阵列高效液相色谱法(HPLC-DAD)及高效液相色谱-串联质谱法(HPLC-MS/MS)测定伪制红薯粉条中非法添加人工合成色素柠檬黄、日落黄、亮蓝的检测方法。样品经粉碎后加0.25 mL氨水(氨水和水体积比为1∶1)、50 mL水涡旋2 min,超声20 min,加水定容后进行检测。结果表明:3种合成色素在添加浓度范围均有良好的线性关系,HPLC-DAD的相关系数(R2)为0.999 2~0.999 3,HPLC-MS/MS的相关系数(R2)为0.996 1~0.997 9,HPLC-DAD和HPLC-MS/MS的检出低限分别为0.08~0.3 mg/kg和0.02~0.05 mg/kg,在低、中、高3个水平进行加标回收实验,HPLC-DAD和HPLC-MS/MS回收率分别为83.5%~89.9%和84.2%~92.5%,相对标准偏差分别为0.62%~4.10%和0.96%~4.92%。方法准确、灵敏度高、回收率高,适用于伪制红薯粉条中非法添加合成色素的检测。 展开更多
关键词 人工合成色素 红薯粉条 二极管阵列高效液相色谱法(HPLC-DAD) 高效液相色谱-串联质谱法(HPLC-MS/MS)
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制首乌与其伪品的理化鉴别 被引量:2
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作者 何恩惠 孙维佳 《航空航天医药》 2010年第3期380-381,共2页
目的:对制何首乌的伪制相似品甘薯进真假鉴别比较。方法:选择正品生药材何首乌和制何首乌为对照物,另取伪制相似品和生甘薯进行实验对照比较区分。结果:伪制相似品和生甘薯相一致,与对照物的性状、显微主要特征和理化反应均有明显的不... 目的:对制何首乌的伪制相似品甘薯进真假鉴别比较。方法:选择正品生药材何首乌和制何首乌为对照物,另取伪制相似品和生甘薯进行实验对照比较区分。结果:伪制相似品和生甘薯相一致,与对照物的性状、显微主要特征和理化反应均有明显的不同。结论:伪制相似品甘薯不可混充制何首乌供药用。 展开更多
关键词 何首乌 相似品 何首乌 甘薯 鉴别
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对染色伪制中药鉴别的探讨 被引量:1
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作者 骆良成 徐超 《现代医药卫生》 2001年第1期43-44,共2页
关键词 染色中药 鉴别 来源 性状
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一种伪制羚羊角的鉴别
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作者 吴志敏 杨令家 +1 位作者 王宝庆 藤志杰 《时珍国医国药》 CAS CSCD 2002年第2期121-121,共1页
关键词 羚羊角 性状鉴别 中药
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假劣药品的伪制手段剖析
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作者 杨曾让 《大理科技》 2002年第1期56-58,共3页
通过对假劣药品伪制手段的剖析,揭示假劣药品的薄弱环节,以便在药品监督检查工作中或群众的自我用药中发现假劣药品线索或直接认定假劣药品。
关键词 药品检验 药品标识 作方法 手段 假劣药品
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现代防伪技术的特点
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作者 卜宏建 苏海涛 《标准化报道》 1997年第5期 12-14,共3页
对现代防伪技术的特点进行了系统的总结。
关键词 制伪 包装技术 全息术 产品
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长安地区北朝金铜佛像形制与铸造技术特征 被引量:3
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作者 于春 《文博》 2016年第3期37-44,共8页
长安地区早在十六国时期已有金铜佛像传入。长安地区北朝金铜佛像有圆雕、背屏式、板式造像三类,其中背屏式占绝大多数。造像技术有范铸法和失蜡法两种,至迟在北魏末期的530年前后,长安地区已经出现了成熟的失蜡法技术铸造佛像;至迟在... 长安地区早在十六国时期已有金铜佛像传入。长安地区北朝金铜佛像有圆雕、背屏式、板式造像三类,其中背屏式占绝大多数。造像技术有范铸法和失蜡法两种,至迟在北魏末期的530年前后,长安地区已经出现了成熟的失蜡法技术铸造佛像;至迟在北魏太和年间,长安地区已经出现了范铸法铸造的金铜佛像。部分出土或馆藏的北朝金铜造像为20世纪初期伪制,必须进行甄别。 展开更多
关键词 金铜佛像 失蜡法 范铸法
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天然牛黄常见伪品及其鉴别方法
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作者 吴文斌 《浙江中西医结合杂志》 2002年第3期182-182,共1页
关键词 天然牛黄 常见 中药鉴定 牛黄 假代牛黄
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Passive detection of copy-paste forgery between JPEG images 被引量:5
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作者 李香花 赵于前 +2 位作者 廖苗 F.Y.Shih Y.Q.Shi 《Journal of Central South University》 SCIE EI CAS 2012年第10期2839-2851,共13页
A blind digital image forensic method for detecting copy-paste forgery between JPEG images was proposed.Two copy-paste tampering scenarios were introduced at first:the tampered image was saved in an uncompressed forma... A blind digital image forensic method for detecting copy-paste forgery between JPEG images was proposed.Two copy-paste tampering scenarios were introduced at first:the tampered image was saved in an uncompressed format or in a JPEG compressed format.Then the proposed detection method was analyzed and simulated for all the cases of the two tampering scenarios.The tampered region is detected by computing the averaged sum of absolute difference(ASAD) images between the examined image and a resaved JPEG compressed image at different quality factors.The experimental results show the advantages of the proposed method:capability of detecting small and/or multiple tampered regions,simple computation,and hence fast speed in processing. 展开更多
关键词 image forensic JPEG compression copy-paste tbrgery passive detection tampered image compressed image
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Image Copy-Move Forgery Detection Using SURF in Opponent Color Space 被引量:4
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作者 巩家昌 郭继昌 《Transactions of Tianjin University》 EI CAS 2016年第2期151-157,共7页
Most existing methods for image copy-move forgery detection(CMFD)operate on grayscale images. Although the keypoint-based methods have the advantages of strong robustness and low computational cost,they cannot identif... Most existing methods for image copy-move forgery detection(CMFD)operate on grayscale images. Although the keypoint-based methods have the advantages of strong robustness and low computational cost,they cannot identify the flat duplicated regions without reliable extracted features. In this paper, we propose a new CMFD method by using speeded-up robust feature(SURF)in the opponent color space. Our method starts by converting the inspected image from RGB to the opponent color space. The color gradient per pixel is calculated and taken as the work space for SURF to extract the keypoints. The matched keypoints are clustered and their geometric transformations are estimated. Finally, the false matches are removed. Experimental results show that the proposed technique can effectively expose the duplicated regions with various transformations, even when the duplication regions are flat. 展开更多
关键词 copy-move forgery flat region color descriptor OwSURF
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Improving Image Copy-Move Forgery Detection with Particle Swarm Optimization Techniques 被引量:7
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作者 SHI Wenchang ZHAO Fei +1 位作者 QIN Bo LIANG Bin 《China Communications》 SCIE CSCD 2016年第1期139-149,共11页
Copy-Move Forgery(CMF) is one of the simple and effective operations to create forged digital images.Recently,techniques based on Scale Invariant Features Transform(SIFT) are widely used to detect CMF.Various approach... Copy-Move Forgery(CMF) is one of the simple and effective operations to create forged digital images.Recently,techniques based on Scale Invariant Features Transform(SIFT) are widely used to detect CMF.Various approaches under the SIFT-based framework are the most acceptable ways to CMF detection due to their robust performance.However,for some CMF images,these approaches cannot produce satisfactory detection results.For instance,the number of the matched keypoints may be too less to prove an image to be a CMF image or to generate an accurate result.Sometimes these approaches may even produce error results.According to our observations,one of the reasons is that detection results produced by the SIFT-based framework depend highly on parameters whose values are often determined with experiences.These values are only applicable to a few images,which limits their application.To solve the problem,a novel approach named as CMF Detection with Particle Swarm Optimization(CMFDPSO) is proposed in this paper.CMFD-PSO integrates the Particle Swarm Optimization(PSO) algorithm into the SIFT-based framework.It utilizes the PSO algorithm to generate customized parameter values for images,which are used for CMF detection under the SIFT-based framework.Experimental results show that CMFD-PSO has good performance. 展开更多
关键词 copy-move forgery detection SIFT region duplication digital image forensics
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Decoupling control and zero dynamics stabilization for shunt hybrid active power filter
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作者 鲁伟 李春文 《Journal of Central South University》 SCIE EI CAS 2014年第5期1946-1955,共10页
An inverse system method based optimal control strategy was proposed for the shunt hybrid active power filter (SHAPF) to enhance its harmonic elimination performance. Based on the inverse system method, the d-axis a... An inverse system method based optimal control strategy was proposed for the shunt hybrid active power filter (SHAPF) to enhance its harmonic elimination performance. Based on the inverse system method, the d-axis and q-axis current dynamics of the SHAPF system were decoupled and linearized into two pseudolinear subsystems. Then, an optimal feedback controUer was designed for the pseudolinear system, and the stability condition of the resulting zero dynamics was presented. Under the control strategy, the current dynamics can asymptotically converge to their reference states and the zero dynamics can be bounded. Simulation results show that the proposed control strategy is robust against load variations and system parameter mismatches, its steady-state performance is better than that of the traditional linear control strategy. 展开更多
关键词 HARMONICS hybrid active power filter inverse system method optimal control zero dynamics
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A PWM/Pseudo-PFM Auto-Mode-Applied Buck DC/DC Switching Regulator 被引量:4
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作者 刘帘曦 杨银堂 朱樟明 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第10期1956-1962,共7页
A buck DC/DC switching regulator is implemented by automatically altering the modulation mode according to the load current that ranges from 0.01 to 3A. The pseudo-PFM mode is applied when duty cycle is less than 20% ... A buck DC/DC switching regulator is implemented by automatically altering the modulation mode according to the load current that ranges from 0.01 to 3A. The pseudo-PFM mode is applied when duty cycle is less than 20% ,and the PWM mode is selected in a range of duty cycle from 20% to 100%. The average conversion efficiency of the regulator is about 90% when the output current varies. The proposed dual-mode-control die is implemented in a 0.5μm DPDM CMOS mixed-signal process and a power p-MOSFET is used in the chip by hybrid integration. 展开更多
关键词 pulse-width-modulation pseudo-pulse-frequency-modulation duty cycle hybrid integrated
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上海古玩业与古玩市场
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作者 江冬妮 《都会遗踪》 2012年第4期153-157,共5页
作者对上世纪30年代中期上海古玩制作业做了大致的叙述,据其生产倾向概括为三种类型:赏玩品制作、仿古制伪、实用型装潢工艺。作者感叹骨董沦为单纯的商品,客观地叙述了古玩市场形形色色的商家和买主及商品行情,形象地告诉人们,'古... 作者对上世纪30年代中期上海古玩制作业做了大致的叙述,据其生产倾向概括为三种类型:赏玩品制作、仿古制伪、实用型装潢工艺。作者感叹骨董沦为单纯的商品,客观地叙述了古玩市场形形色色的商家和买主及商品行情,形象地告诉人们,'古玩交易在上海相当活跃,那里是古玩行家收藏家的乐园'。 展开更多
关键词 制伪 古玩 工艺 作者 商品 作业 上海
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