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全球范围内上寒武统排碧阶地层中普遍记录了一次碳酸盐岩稳定碳同位素（δ13Ccarb）正向漂移事件，即SPICE（Steptoean Positive Carbon Isotope Excursion）事件。关于SPICE事件的成因，研究普遍认为是由于在广泛的大洋缺氧/缺氧硫化条件下有机质埋藏增加，但存在较大争议。如图1所示，研究发现在全球区域等时沉积地层中残余有机质（干酪根）同时富集重的稳定碳同位...
广州地化所揭示上寒武统排碧阶SPICE事件的地球化学成因（图）
地球化学 碳酸盐岩 有机质埋藏
2023/5/11
全球范围内上寒武统排碧阶地层中普遍记录了一次碳酸盐岩稳定碳同位素（δ13Ccarb）正向漂移事件，即SPICE（Steptoean Positive Carbon Isotope Excursion）事件。对于SPICE事件的成因，研究学者普遍认为是由于在广泛的大洋缺氧/缺氧硫化条件下有机质埋藏增加所致，但这种认识也一直存在较大的争议。如图1所示，发现在全球区域等时沉积地层中残余有机质（干酪根）也...
全球范围内上寒武统排碧阶地层中普遍记录了一次碳酸盐岩稳定碳同位素（δ13Ccarb）正向漂移事件，即SPICE（Steptoean Positive Carbon Isotope Excursion）事件。对于SPICE事件的成因，研究学者普遍认为是由于在广泛的大洋缺氧/缺氧硫化条件下有机质埋藏增加所致，但这种认识也一直存在较大的争议。如图1所示，发现在全球区域等时沉积地层中残余有机质（干酪根）也...
碳同位素地层学与生物地层学识别华北地台寒武系SPICE事件（图）
碳同位素地层学 碳酸盐岩 华北九龙山剖面 化石
2021/8/2
中国科学院南京地质古生物研究所孟凡巍副研究员、袁金良研究员以及美国密苏里大学Schiffbauer J D副教授等人，与临沂大学任咣营教授（特聘）进行合作，对华北地区晚寒武世的十几个剖面开展地质调查，采集了大量的化石和岩石标本。在生物地层学、岩石地层学、年代地层学和地球化学等综合研究基础上，通过对高分辨率的碳同位素地层研究，在华北地区识别出苗岭统和芙蓉统界线之间的SPICE（Steptoean P...
华北台地东部寒武系SPICE事件研究新进展（图）
华北台地东部 寒武系 SPICE事件
2020/6/17
寒武系苗岭统与芙蓉统之交的碳同位素正漂移SPICE事件，是显生宙全球碳循环的一次较大波动（其正漂幅度可达~5‰），在全球各大陆均有相关报道和研究。与之同时发生的是德雷斯巴奇阶（Dresbachian）生物灭绝事件，导致约40%的海洋生物灭绝，是早期寒武纪生命演化进程中较为严重的一次灭绝事件。大量研究认为SPICE事件是由有机碳大量埋藏导致，并伴随着显著的海洋缺氧和硫化，这也很可能是导致德雷斯巴奇阶...
西安电子科技大学集成电路EDA基础课件 SPICE模型及模型参数。
南京航空航天大学电子线路课件第三章 基于SPICE的集成电路仿真
南京航空航天大学 电子线路 课件 第三章 基于SPICE的集成电路仿真
2016/11/16
南京航空航天大学电子线路课件第三章 基于SPICE的集成电路仿真。
NASA's "SPICE"* ancillary information system has gradually become the de facto international standard for providing scientists the fundamental observation geometry needed to perform photogrammetry, ma...
Was the Secret Spice in Primal Gene Soup a Thickener?
Secret Spice Primal Gene Soup Thickener
2016/11/4
The original recipe for gene soup may have been simple -- rain, a jumble of common molecules, warm sunshine, and nighttime cooling. Then add a pinch of thickener. That last ingredient may have he...
Variation and the spice of life
spice bane variation disease
2018/12/14
If variety is the spice of life, it is also simultaneously the goal and bane of science. The scientific method seeks to limit methodologic variation to better identify biological variation. And it is ...
Development and Validation of the Student Perceptions of Physician-Pharmacist Interprofessional Clinical Education (SPICE) Instrument
interprofessional education interdisciplinary education instrument validation
2018/6/28
Objectives. To describe the development and validation of an instrument designed to assess student perceptions of physician-pharmacist interprofessional clinical education (SPICE).
Methods. Faculty m...
The Spice Kitchen: Apprenticeship Training in Culinary Skills
Spices Culinary Class Dietetic Education Food Preparation Antioxidants
2013/2/20
Current Dietary Guidelines for Americans emphasize the need to reduce dietary sodium. Spices impart flavor to food, serving as substitutes for salt. In addition, the antioxidant activity of spices can...
A Note on the SPICE Method
Note SPICE Method
2012/11/23
In this article, we analyze the SPICE method developed in [1], and establish its connections with other standard sparse estimation methods such as the Lasso and the LAD-Lasso. This result positions SP...
SPICE model of memristive devices with threshold
SPICE model memristive devices threshold Computational Physics
2012/4/24
Although memristive devices with threshold voltages are the norm rather than the exception in experimentally realizable systems, their SPICE programming has not yet been suggested. Here, we show how t...
Evaluation of Inhibitory Effects of Spice-Derived Natural Extracts on Histidine Decarboxylase
histidine decarboxylase histamine inhibition spice
2009/8/18
This study examines the inhibitory activity of spice extracts on histidine decarboxylase which synthesizes histamine, a bioactive amine participating in gastrointestinal ulcer and allergy ailments. It...