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Unveiling the secrets of diatom-mediated calcification:Implications for the biological pump

Science China Earth Sciences 2024年第9期67卷 2895-2909页

作者： yiwen pan Yifan LI Chen-Tung Arthur CHEN Zong-Pei JIANG Wei-Jun CAI Yunwen SHEN Zesheng DING Qixian CHEN Yanan DI Wei FAN Chenba ZHU Ying CHEN Ocean College Zhejiang UniversityZhoushan 316021China Hainan Institute of Zhejiang University Sanya 570203China Department of Oceanography Sun Yat-Sen UniversityGaoxiong 80424China School of Marine Science and Policy University of DelawareNewark DE 19716USA Carbon Neutral Innovation Research Center Xiamen UniversityXiamen 361005China

Siliceous diatoms are one of the most prominent actors in the oceans,and they account for approximately 40%of the primary production and particulate organic carbon export *** is believed that changes in carbon flux caused by variations in diatom distribution can lead to significant climate *** the fundamental pathways of diatom-driven carbon sequestration have long been established,there are no reports of CaCO_(3) precipitation induced by marine diatom *** manuscript introduces novel details regarding the enhancement of aragonite precipitation during photosynthesis in Skeletonema costatum in both artificial and natural *** direct measurements of cell surfaces via a pH microelectrode and zeta potential analyzer,it was determined that the diatom-mediated promotion of CaCO_(3) precipitation is achieved through the creation of specific microenvironments with concentrated[CO_(3)^(2-)]and[Ca^(2+)]and/or the dehydrating effect of adsorbed Ca^(2+).Based on this mechanism,it is highly plausible that diatom-mediated calcification could occur in the oceans,an assertion that was supported by the significant deviation of total alkalinity(TA)from the conservative TA-salinity mixing line during a Skeletonema costatum bloom in the East China Sea and other similar *** newly discovered calcification pathway establishes a link between particulate inorganic and organic carbon flux and thus helps in the reassessment of marine carbon export fluxes and CO_(2) sequestration *** discovery may have important ramifications for assessing marine carbon cycling and predicting the potential effects of future ocean acidification.

关键词： Diatom bloom Skeletonema costatum Calcification Biological carbon pump Counter carbonate pump

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市场是否挤出了信任:一个来自实验经济学的考察

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经济理论与经济管理 2024年第7期44卷 33-49页

作者：陈叶烽王嘉瑞丁预立潘意文吴湘华浙江大学经济学院浙江大学跨学科社会科学研究中心美国波士顿大学经济系浙江工商大学现代商贸研究中心浙江工商大学经济学院 310018 澳大利亚新南威尔士大学

市场是否挤出了信任是社会科学共同关注的一个基础性问题。本文运用信息不对称的经验品模型模拟了“有市场”环境,同时运用组内设计和数据平移创造性地设计了一个博弈结构完全相同的模型来刻画“无市场”环境,并设置了七个实验局分别剥... 详细信息

市场是否挤出了信任是社会科学共同关注的一个基础性问题。本文运用信息不对称的经验品模型模拟了“有市场”环境,同时运用组内设计和数据平移创造性地设计了一个博弈结构完全相同的模型来刻画“无市场”环境,并设置了七个实验局分别剥离了市场中的语言描述、消费者选择权、商家定价权三个要素,从而全面对比了“有市场”与“无市场”时信任水平的差异。实验结果表明:首先,市场能够有效提升信任水平,市场与信任可形成正反馈,这进一步凸显了市场在资源配置中的决定性作用;其次,消费者选择权与商家定价权所发挥的作用并不对称,其中消费者选择权是关键因素,保护消费者权益对于构建一个良性有效率的市场尤为重要;再次,声誉是消费者选择权促进信任水平提升的重要渠道。本文加深了我们对市场自由竞争本质以及市场机制运行的理解,并为我国的市场化改革提供了重要启示:要尊重市场运行规律、强化竞争政策基础地位、保障消费者权益。

关键词：市场信任市场语言描述消费者选择权商家定价

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Preparation and Osteogenic Efficacy of Emodin-loaded Hydroxyapatite Electrospun Fibers

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Journal of Bionic Engineering 2023年第3期20卷 1060-1071页

作者： yiwen pan Mu He Shaoqing Chen Yanyan Meng Cheli Wang Xinye Ni School of Pharmacy Changzhou UniversityChangzhou213000China Department of Radiotherapy Changzhou Second People’s HospitalNanjing Medical UniversityChangzhou213000China Laboratory of Medical Physics Center Nanjing Medical UniversityNanjing210000China Changzhou Key Laboratory of Medical Physics Changzhou213000China

Biological scaffolds have been the focus of bone tissue engineering research in recent years. In this paper, emodin (EM), macromolecular compound polycaprolactone (PCL), and hydroxyapatite (HA) were used as raw materials to prepare EM/PCL/HA fibers containing different EM ratios by electrospinning, and the properties and osteogenic efficacy of EM/PCL/HA were studied. Scanning electron microscopy, transmission electron microscopy, and atomic force microscopy were used to characterize the structures of HA and the electrospun fibers. Results showed that HA has high crystallinity and loose porous structure, and the electrospun fibers have a smooth and flat surface. In vitro release results showed that EM was slowly released from EM/PCL/HA within 216 h. Cell proliferation assay in mouse embryonic osteoblast precursor cells (MC3T3-E1) exhibited that 5% EM/PCL/HA had the best effect on promoting cell proliferation. Alkaline phosphatase (ALP) and mineralized nodules staining results also showed that 5% EM/PCL/HA had the best effect on promoting osteogenic differentiation. qRT-PCR results showed that the mRNA expression level of osteoblast differentiation markers, namely, bone morphogenetic protein (BMP)-2, BMP-9, and osteocalcin were significantly upregulated by 5% EM/PCL/HA treatment. These results indicate that EM/PCL/HA is a potential osteogenic material, which can provide a reference for the development of bone injury repair materials.

关键词： Emodin Hydroxyapatite Electrospinning Bone regeneration

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Spatial distribution pattern of seafloor hydrothermal vents to the southeastern Kueishan Tao offshore Taiwan Island

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Acta Oceanologica Sinica 2014年第4期33卷 37-44页

作者： HAN Chenhua YE Ying pan yiwen QIN Huawei WU Guanghai CHEN Chen-Tung Arthur The Second Institute of Oceanography State Oceanic Administration Zhejiang University Hangzhou Dianzi University National Sun Yat-sen University

Investigations of the diffusion activities both within and outside the seafloor hydrothermal vents, as well as related mineral genesis, have been one of the key focuses of ocean biogeochemistry studies. Many hy- drothermal vents are distributed close to the southern Okinawa Trough on the less-than-30-m deep shallow seafloor off Kueishan Tao, northeast of Taiwan Island. Investigations of temperature, pH and Eh at four depths of hydrothermal plume were carried out near Kueishan Tao at the white （24.83°N, 121.9°E） and yellow （24.83°N, 121.96°E） vents. An 87 h of temperature time series observation-undertaken near the white vent showed that tide is the main factor affecting the background environment. Based on the observed data, 3-dimensional sliced diffusion fields were obtained and analyzed. It was concluded that the plume diffused mainly from north to south due to ebb tide. The yellow vent＇s plume could effect as far as the white vent surface. From the temperature diffusion field, the vortices of the plume were observed. The Eh negative abnormality was a better indicator to search for hydrothermal plumes and locate hydrothermal vents than high temperature and low pH abnormalities.

关键词： Taiwan Kueishan Tao epithermal hydrothermal chemical sensor pH Eh

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Research progress in artificial upwelling and its potential environmental effects

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Science China Earth Sciences 2016年第2期59卷 236-248页

作者： pan yiwen FAN Wei ZHANG DaHai CHEN JiaWang HUANG HaoCai LIU ShuXia JIANG ZongPei DI YaNan TONG MengMeng CHEN Ying Ocean College Zhejiang University

Artificial upwelling, as a geoengineering tool, has received worldwide attention because it may actualize ocean fertilization in a sustainable way, which could potentially alleviate the pressures on the fish stocks and human-driven climate change in the ocean. We reviewed the current knowledge on the development of an artificial upwelling system and its potential environmental effects. Special attention was given to the research progress on the air-lift concept artificial upwelling by Zhejiang University. The research on artificial upwelling over the past few decades has generated a range of devices that have been successfully applied in the field for months. Based on field experiments and the associated modeling results, part of them reported positive effects on increasing primary production and enhancing CO2 sequestration. However, as a significant disturbance to the environment, especially for large-scale applications, the uncertainties related to the potential effects on ecosystem remain unsolved. Zhejiang University has overcome the technical challenges in designing and fabricating a robust and high efficiency artificial upwelling device which has been examined in two field experiments in Qiandao Lake and one sea trial in the East China Sea. It was investigated that cold and hypoxic deep ocean water(DOW) could be uplifted to the euphotic layer, which could potentially change the nutrient distribution and adjust the N/P ratio. Both simulation and field experiments results confirmed that utilizing self-powered energy to inject compressed air to uplift DOW was a valid and efficient method. Therefore, further field-based research on artificial upwelling, especially for long-term field research is required to test the scientific hypothesis.

关键词： Artificial upwelling Air-lifting Self-powered Environmental impacts Research progress

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奥地利国家档案馆探析

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档案与建设 2015年第10期 31-34页

作者：潘毅文西南大学档案馆重庆400715

奥地利国家档案馆是保存欧洲"历史记忆"的重要机构,它始终以保护文化遗产、保存档案以及完成公共管理框架内的任务为使命,在历史传承的基础上实现自身的文化价值。该馆历史底蕴深厚,各部门功能专一且独具特色,馆藏资源丰富且利用率高,... 详细信息

奥地利国家档案馆是保存欧洲"历史记忆"的重要机构,它始终以保护文化遗产、保存档案以及完成公共管理框架内的任务为使命,在历史传承的基础上实现自身的文化价值。该馆历史底蕴深厚,各部门功能专一且独具特色,馆藏资源丰富且利用率高,同时该馆历来重视档案的管理与保护,无论是技术利用还是理念创新均别具一格,它的诸多优点值得我们研究和借鉴。

关键词：奥地利国家档案馆档案机构档案工作档案事业历史概况

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化学液相沉积法制备碳／碳复合材料时的温度场研究

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西安交通大学学报 2008年第3期42卷 309-312,384页

作者：潘仡文杨冬刘红林西安交通大学动力工程多相流国家重点实验室西安710049 中国航天科技集团公司4院43所西安710025

根据制备过程中碳纤维骨架内煤油发生相变时的气液两相流动与传热传质、预制体对煤油的导热以及碳纤维多孔介质内的传热传质性质,建立了描述碳纤维骨架内温度场分布与相变特性的数学模型.对采用感应加热方式、直径为70 mm的预制体在汽... 详细信息

根据制备过程中碳纤维骨架内煤油发生相变时的气液两相流动与传热传质、预制体对煤油的导热以及碳纤维多孔介质内的传热传质性质,建立了描述碳纤维骨架内温度场分布与相变特性的数学模型.对采用感应加热方式、直径为70 mm的预制体在汽化温度为453.15 K时的制备过程进行了数值研究,得到了骨架内温度场随时间的变化.给出了不同时刻的温度场分布、径向温度随时间的变化规律,以及相变过程含气率沿径向的分布.将计算所得的电加热功率与制备过程中实际的电加热功率进行了比较,二者较为接近,验证了所建数学模型的可靠性.

关键词：化学液相沉积法碳/碳复合材料温度场

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Association between dietary fiber intake and risk of coronary heart disease:A meta-analysis

Association between dietary fiber intake and risk of coronar...

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2014年浙江省心电生理与起搏学术年会

作者： Yufeng Qian Haiyan Lin Shangwei Huang Xiaohong Xu yiwen pan Ying Zhou Geng Xu Department of Cardiology The Second Affiliated HospitalZhejiang University School of Medicine

Background&aims:The association between coronary heart disease(CHD)and dietary fiber intake is not consistent,especially for the subtypes of dietary *** aim of our study was to conduct a metaanalysis of existing cohort published studies assessing the association between dietary fiber intake and risk of CHD,and quantitatively estimating their dose-response ***:We searched PubMed and EMBASE before May ***-effect model was used to calculate the pool relative risk(RRs)for the incidence and mortality of ***-response,subgroup analyses based on fiber subtypes,heterogeneity and publication bias were also carried ***:Eighteen studies involving 672,408 individuals were finally included in the present *** pooled-adjusted RRs of coronary heart disease for the highest versus lowest category of fiber intake were 0.93(95%confidence interval(CI),0.91-0.96;P<0.001)for incidence of all coronary events and 0.83(95%CI,0.76-0.91,P<0.001)for *** subgroup analyses based on fiber subtypes(cereal,fruit,and vegetable fiber),indicated that RRs were 0.92(95%CI,0.85-0.99,P=0.032),0.92(95%CI,0.86-0.98,P=0.01),0.95(95%CI,0.89-1.01,P=0.098)respectively for all coronary event and 0.81(95%CI,0.72-0.92,P=0.001),0.68(95%CI,0.43-1.07,P=0.094),0.91(95%CI,0.74-1.12,P=0.383)for *** addition,a significant dose-response relationship was observed between fiber intake and the incidence and mortality of CHD(P<0.001).Conclusions:Our results indicate that consumption of dietary fiber is inversely associated with risk of coronary heart disease,especially for fiber from cereals and ***,soluble and insoluble fibers have the similar effect.A significant dose-response relationship is also observed between fiber intake and CHD risk.

关键词： dietary fiber coronary disease incidence mortality meta-analysis

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传感器节点自主供电的环境混合能量收集系统设计

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农业工程学报 2017年第8期33卷 147-152页

作者：徐雷钧白雪潘祎雯毛罕平江苏大学电气信息工程学院镇江212013 东南大学毫米波国家重点实验室南京210096 江苏大学现代农业装备与技术省部共建教育部重点实验室镇江212013

农田复杂环境及大面积监测需求对农业物联网传感器节点的供电提出了极大挑战,而环境能量收集技术则使低功耗农业物联网传感器节点的自供电及免维护成为可能。针对传统能量收集装置中收集的环境能量单一有限、装置体积大、可靠性差的问题... 详细信息

农田复杂环境及大面积监测需求对农业物联网传感器节点的供电提出了极大挑战,而环境能量收集技术则使低功耗农业物联网传感器节点的自供电及免维护成为可能。针对传统能量收集装置中收集的环境能量单一有限、装置体积大、可靠性差的问题,该文提出了一种新型混合环境能量一体化收集系统。该系统定位于环境中普遍而丰富的射频电磁波能量和振动能量,通过射频收集天线和压电陶瓷的有效结合,同时收集2种环境能量,并经整流转换成直流电能。能量收集天线使用普通FR4印刷电路板实现,工作在手机通信频段1.9 GHz(3G频段),测试的回波损耗为-20.5 d B,对电磁波能量收集的最高输出功率可达到38 mW,测得收集到的振动能量最大输出功率可达到25 mW,满足低功耗传感器节点的功率需求。该装置不仅可以有效提高系统供电的可靠性和对环境的适应能力,还大大降低了传统混合系统的尺寸,可为农业物联网快速发展中的传感器节点可靠供电问题提供参考。

关键词：传感器整流电路设计农业物联网能量收集射频能量振动能量匹配网络

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桐乡濮绸的产品特征及其当代创新设计研究

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丝绸 2022年第5期59卷 95-102页

作者：潘依雯周赳戴金海浙江理工大学浙江省丝绸与时尚文化研究中心杭州310018 磐十文化艺术创意有限公司浙江嘉兴314500

濮绸是宋元明清时期桐乡濮院地区所产的著名丝织品。文章以桐乡濮绸的起源及其发展沿革为线索,对其品种范围进行界定,从技术美(材质、工艺)特征与艺术美(造型、纹样、色彩)两个层面对桐乡濮绸的产品特征进行分析,并提出桐乡濮绸当代创... 详细信息

濮绸是宋元明清时期桐乡濮院地区所产的著名丝织品。文章以桐乡濮绸的起源及其发展沿革为线索,对其品种范围进行界定,从技术美(材质、工艺)特征与艺术美(造型、纹样、色彩)两个层面对桐乡濮绸的产品特征进行分析,并提出桐乡濮绸当代创新的方法和路径。研究认为:桐乡濮绸大多为单层结构,由简单组织构成,产品具有多品种特征。纹样受桐乡地区经济社会的发展及中国传统思想的影响,注重题材象征含义的表达。色彩具有桐乡地域特征和中国传统特征相融合的特点。原料和技术受桐乡自然环境与地理位置的影响,使得产品具有白净、细腻、柔韧、耐洗等特征。桐乡濮绸的“艺工商”结合创新方法有助于桐乡濮绸产品的历史传承与当代创新。

关键词：濮绸桐乡丝织品品种界定美学特征营商模式

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