Journal of Gemmology最新文献_第8页

The Imperial Crown of the Holy Roman Empire, Part I: Photoluminescence and Raman Spectroscopic Study of the Gemstones 神圣罗马帝国的王冠，第一部分:宝石的光致发光和拉曼光谱研究

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2023-01-01 DOI: 10.15506/jog.2023.38.5.448

引用次数: 0

A Brilliant Commodity: Diamonds and Jews in a Modern Setting 一种辉煌的商品:现代背景下的钻石和犹太人

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2023-01-01 DOI: 10.15506/jog.2023.38.5.533

R. Shor

引用次数: 0

Colour-Change Garnet Showing Blue Colouration from Kamtonga, Kenya 变色石榴石呈现蓝色，产自肯尼亚加姆汤加

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2023-01-01 DOI: 10.15506/jog.2023.38.6.545a

C. Schwarzinger

引用次数: 0

Directional Preference in Avian Midbrain Saliency Computing Nucleus Reflects a Well-Designed Receptive Field Structure. 鸟类中脑显著性计算核的方向偏好反映了精心设计的感受野结构

IF 2.7 4区地球科学

Journal of Gemmology Pub Date : 2022-04-28 DOI: 10.3390/ani12091143

Jiangtao Wang, Longlong Qian, Songwei Wang, Li Shi, Zhizhong Wang

{"title":"Directional Preference in Avian Midbrain Saliency Computing Nucleus Reflects a Well-Designed Receptive Field Structure.","authors":"Jiangtao Wang, Longlong Qian, Songwei Wang, Li Shi, Zhizhong Wang","doi":"10.3390/ani12091143","DOIUrl":"10.3390/ani12091143","url":null,"abstract":"Neurons responding sensitively to motions in several rather than all directions have been identified in many sensory systems. Although this directional preference has been demonstrated by previous studies to exist in the isthmi pars magnocellularis (Imc) of pigeon (Columba livia), which plays a key role in the midbrain saliency computing network, the dynamic response characteristics and the physiological basis underlying this phenomenon are unclear. Herein, dots moving in 16 directions and a biologically plausible computational model were used. We found that pigeon Imc's significant responses for objects moving in preferred directions benefit the long response duration and high instantaneous firing rate. Furthermore, the receptive field structures predicted by a computational model, which captures the actual directional tuning curves, agree with the real data collected from population Imc units. These results suggested that directional preference in Imc may be internally prebuilt by elongating the vertical axis of the receptive field, making predators attack from the dorsal-ventral direction and conspecifics flying away in the ventral-dorsal direction, more salient for avians, which is of great ecological and physiological significance for survival.","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9105111/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89330377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

JNA’s Pearl Report 2022–2023 JNA的珍珠报告2022-2023

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2022.38.4.308

Carol M. Stockton

引用次数: 0

Paraíba or Not? Cu-bearing Tourmaline with a Distinct Fe Concentration Paraíba或不?具有明显铁浓度的含铜碧玺

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2021.38.1.20

M. Krzemnicki, Hao A. O. Wang

引用次数: 0

Webinars and Other Online Gemmological Education 网络研讨会和其他在线宝石学教育

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2021.38.1.3b

Carol M. Stockton

引用次数: 0

Demantoid Garnet from Antetezambato, Northern Madagascar—Internal Characteristics and Their Use in Deciphering Geographic Origin 马达加斯加北部Antetezambato的Demantoid石榴石内部特征及其在地理来源解释中的应用

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2021.38.1.64

J. Zwaan

{"title":"Demantoid Garnet from Antetezambato, Northern Madagascar—Internal Characteristics and Their Use in Deciphering Geographic Origin","authors":"J. Zwaan","doi":"10.15506/jog.2021.38.1.64","DOIUrl":"https://doi.org/10.15506/jog.2021.38.1.64","url":null,"abstract":": Demantoid garnets from Antetezambato, northern Madagascar, contain a characteristic inclusion suite typical of a skarn occurrence. Unlike demantoid from the classic deposits in the Ural Mountains, Russia, and from other serpentinite-related occurrences, the stones from Madagascar do not contain ‘horsetail’ inclusions, but instead host groups of small, rounded diopside grains, fluorapatite, dolomite, calcite, quartz, pyrite and wollastonite, as well as rare native bismuth. Partially healed fissures contain two-phase fluid inclusions (with H 2 O and a gas bubble) of varying salinity. Negative crystals, commonly large and empty, sometimes also contain H 2 O. Pronounced growth features and parallel hollow tubes are also present. Demantoid from Namibia likewise has a skarn origin and shows some similar internal features, as well as some that are different, such as the common presence of fluorapatite and small multiphase fluid inclusions, along with the absence of large negative crystals and native bismuth. A review of previously advocated methods for geographic origin determination of demantoid based on chemical fingerprinting alone shows that this technique is applicable only to stones with a nearly pure andradite composition when differentiating Malagasy and Namibian localities. In such cases, elevated traces of Mn are indicative of a Namibian origin.","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67235004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

World Silver Survey 2022 2022年世界白银调查

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2022.38.3.214d

Carol M. Stockton

引用次数: 2

Assure Program Developments 确保项目发展

IF 1.2 4区地球科学

Journal of Gemmology Pub Date : 2022-01-01 DOI: 10.15506/jog.2022.38.4.308b

Carol M. Stockton

引用次数: 0