共查询到20条相似文献,搜索用时 203 毫秒
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中国砗磲文化艺术研究院院长叶圣民与砗磲结缘于上世纪90年代,因一个文化项目的筹备,当时他与海南的一位贝壳收藏爱好者相识,第一次见到了砗磲。所看砗磲体积之大,洁白美丽的纹理给他留下了非常深刻的印象。当时的叶圣民对砗磲并不熟知,后来经过查阅大量的资料,了解到砗磲这一古老的宝石品种价值竟然如此之高,和中华民族文化如此紧密不禁大吃一惊,相见恨晚。想到这样的一个宝物并不为大家熟知,不免心生遗憾。于是,叶圣民提议建立一座砗磲艺术馆,让更多人了解这一美丽的自然之宝,这也算是对中国砗磲文化的传播。1996年,在广东的海陵岛成立了中国首家砗磲艺术馆。1997年香港回归时,海南省把一个美轮美奂的砗磲化石标本作为赠礼送给香港特区政府,使这一美丽的宝物能够呈现在广大市民眼里。 相似文献
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砗磲与珊瑚.珍珠.琥珀一样,在佛教中被列为七宝之一。据《本草纲目》记载.它具有镇心、安神等功效,代表着高贵与纯洁,是幸福与永恒的象征。清朝二品以上官员朝拜时佩戴的朝珠就是由砗磲穿制而成。西藏喇嘛高僧所持有的念珠也是砗磲制成的。 相似文献
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《宝石和宝石学杂志》2021,(4)
近期,市场上出现了一种橙红色砗磲品种,选取具有代表性的橙红色砗磲样品,对其进行了较为系统的宝石学特征及谱学分析研究。采用宝石显微镜观察形貌特征、红外光谱仪检测橙红色砗磲样品种属成分、显微激光拉曼光谱仪分析其颜色,并与市场上较常见金丝砗磲样品进行对比。经分析发现,橙红色砗磲样品的红外光谱谱峰与砗磲一致,拉曼光谱结果显示了橙红色砗磲中文石拉曼特征峰以及1 130 cm~(-1)和1 520 cm~(-1)处与色素有关的拉曼特征峰,与橙红色砗磲的白色部分对比发现其颜色主要与天然有机色素类红萝卜素有关,属于天然颜色成因。 相似文献
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砗磲与珊瑚、珍珠、琥珀一样,在佛教中被列为七宝之一.据《本草纲目》记载,它具有镇心、安神等功效.代表着高贵与纯洁,是幸福与永恒的象征. 相似文献
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最近,在北京珠宝市场上出现了大量的"金丝砗磲"。通过常规宝石学检测和紫外-可见光吸收光谱测试,对其进行了初步研究。结果表明,此种"金丝砗磲"并不是砗磲,而是一种海洋腹足纲类海螺贝经染色而成的饰品。该海螺贝呈螺旋状层状构造,可以通过其表面颜色不均、黄色部分不透明、黄色部分无荧光加以鉴别,也可以采用紫外-可见光分光光度计测试加以鉴别。 相似文献
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胭脂螺是一种颜色鲜艳,极具经济价值的观赏性海螺,近年在文玩珠宝界中越来越流行,其价值超过了市场中流行的砗磲,万宝螺等其他相似的有机宝石。本文选取了市场购买的胭脂螺外骨骼样品为研究对象,使用宝石显微镜,X射线衍射光谱仪,激光拉曼光谱仪,显微红外光谱仪及激光诱导离解光谱仪对胭脂螺外骨骼的宝石学特征进行了研究,以探究胭脂螺外骨骼的化学成分和结构,为其以后的研究发展提供一定的理论基础。结果表明:胭脂螺外骨骼的主要矿物组成是文石,内部存在棱柱状、条带状、纤维状等生物结构。不同色层具有相似的元素及质量分数,颜色成因可能与致色元素无关,而与有机物的种类及质量分数相关。红外光谱的半定量分析结果表明,粉色区域有机物相对质量分数较高;橙色,黄色区域质量分数居中;白色区域质量分数最低。结合其他测试数据,推测不同种类的有机物产生了不同颜色的胭脂螺外骨骼区域,黄色橙色的成因与金属卟啉有关,粉色的成因则与类胡萝卜素有关。 相似文献
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Rennet and rennet substitutes 总被引:1,自引:0,他引:1
John Winwood 《International Journal of Dairy Technology》1989,42(1):1-2
The use of calf rennet substitutes in cheese manufacture will increase because of costs linked with the availability of calf vells on the world market and the development of new cheese making processes such as ultrafiltration. The development of recombinant DNA techniques for chymosin production will also have an impact on the traditional calf rennet market when rennet manufacture by this method has been perfected. Further research into the secondary action of rennet during cheese maturation will also lead to a better understanding of how rennet can influence the flavour and textural characteristics of various cheese. 相似文献
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王云蔚 《北京印刷学院学报》2014,(1):29-32
以互联网为技术平台的电子商务的发展以及各种智能终端的开发和应用,每天都产生着大量的以TB(太字节)和PB(拍字节)等为单位的大数据。大数据时代的到来,给消费市场的研究带来了几个方面的冲击,包括对消费者数据的获得方式、消费市场数据分析的工具与方法等。同时大数据也改变了传统的调查所产生的数据对于消费市场研究的地位和作业等。本文将从大数据对消费市场的影响入手,通过分析得出大数据背景下如何展开消费市场的研究。 相似文献
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<正> 冥冥中似注定了这个冬天并不暖和。这个冬天,大雪从哈尔滨下到了昆明;这个冬天,澳门回到了母亲的怀抱;这个冬天,新世纪的圣火在神州大地升腾。这个冬天很冷,北京出现了13年来的最低温度,但就在这料峭的寒冬,冰淇淋却异常地火爆起来。各大商场、超市里的冰淇淋琳琅满目,儿童、年轻人、妈妈们挑来选去络绎不绝,服务员大箱、小箱不断地上货,马路上“和路雪”、“美登高”的冷藏车 相似文献
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Abstract: Classical detection thresholds do not predict liking, as they focus on the presence or absence of a sensation. Recently however, Prescott and colleagues described a new method, the rejection threshold, where a series of forced choice preference tasks are used to generate a dose‐response function to determine hedonically acceptable concentrations. That is, how much is too much? To date, this approach has been used exclusively in liquid foods. Here, we determined group rejection thresholds in solid chocolate‐flavored compound coating for bitterness. The influences of self‐identified preferences for milk or dark chocolate, as well as eating style (chewers compared to melters) on rejection thresholds were investigated. Stimuli included milk chocolate‐flavored compound coating spiked with increasing amounts of sucrose octaacetate, a bitter and generally recognized as safe additive. Paired preference tests (blank compared to spike) were used to determine the proportion of the group that preferred the blank. Across pairs, spiked samples were presented in ascending concentration. We were able to quantify and compare differences between 2 self‐identified market segments. The rejection threshold for the dark chocolate preferring group was significantly higher than the milk chocolate preferring group (P= 0.01). Conversely, eating style did not affect group rejection thresholds (P= 0.14), although this may reflect the amount of chocolate given to participants. Additionally, there was no association between chocolate preference and eating style (P= 0.36). Present work supports the contention that this method can be used to examine preferences within specific market segments and potentially individual differences as they relate to ingestive behavior. Practical Application: This work makes use of the rejection threshold method to study market segmentation, extending its use to solid foods. We believe this method has broad applicability to the sensory specialist and product developer by providing a process to identify how much is too much when formulating products, even in the context of specific market segments. We illustrate this in solid chocolate‐flavored compound coating, identifying substantial differences in the amount of acceptable bitterness in those who prefer milk chocolate compared to dark chocolate. This method provides a direct means to answer the question of how much is too much. 相似文献
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清中叶,湖广私盐异常活跃。名目繁多的私盐严重影响了官盐的销售,对湖广官盐市场造成了很大的冲击。那么,在湖广食盐市场,当时私盐到底占有多大的比重呢?目前有两种观点比较具有代表性,一种观点认为私盐占市场份额的三分之一;另一种观点为"官私之半"说。建立在大量文献资料基础上的量化分析表明,如果不分具体时间与地点,笼统地估算私盐市场份额,无论是"三分之一"还是"官私之半"之说,其实都是很不确切的。 相似文献
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商品条码是酒类产品进入市场的入场券。从酒类产品如何获取商品条码,如何选用商品条码符号及商品条码符号的设计进行了阐述,对酒类生产企业、经销商使用商品条码具有一定指导意义。 相似文献
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