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Mechanisms of high-frequency dinoflagellate blooms of Scrippsiella trochoidea in Daya Bay,South China Sea

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Journal of Oceanology and Limnology 2021年第4期39卷 1293-1304页

作者： Yuan TIAN Simin HU Xianzhi LIN Hui HUANG Xingyu SONG Yan YAN xuedong xie Tao LI Sheng LIU Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Provincial Key Laboratory of Applied Marine BiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Tropical Marine Biological Research Station in Hainan Chinese Academy of SciencesSanya 572000China Nansha Marine Ecological and Environmental Research Station Chinese Academy of SciencesGuangzhou 510301China Guangdong Ocean and Fishery Environment Monitoring and Forecasting Center Guangzhou 510222China

Harmful algal blooms(HABs),such as dinoflagellate blooms,have adverse eff ects on coastal water environments,causing seafood contamination and aquaculture economic *** on historical HAB records data(1983-2017)and phytoplankton data(1982-2008),field investigation and laboratory experiments on frequently bloomed dinoflagellate species,we analyzed the possible mechanisms of high frequency dinoflagellate blooms in Daya Bay,South China *** HAB records data show that the proportion of dinoflagellate blooms increased from 15% before 1994 to 77.27% after *** bloom occurred mostly in summer(57.58%)in Yaling Bay(76.92%).The species inducing dinoflagellate blooms tended to be singular over time,with high proportion of Scrippsiella trochoidea(42.86%-88.88%).Laboratory experiment and field investigation of *** bloom showed that this species grew rapidly at 30℃ and 32.1℃(r=0.47,P7 m/s),which disturbed the resting cysts in the sediment and bring them into surface *** into account of environmental parameters,algae source,and atmospheric conditions,the probable mechanism of *** bloom could be *** cysts were resuspended by the spring tide or strong wind,germinated at the bottom layer,reproduced rapidly at higher temperature,and then aggregated in the inner bay(Yaling Bay),resulting the frequent *** *** the influences of global warming and human activities,it should be taken more attention that dinoflagellate blooms might increase along the coastal waters.

关键词： harmful algal blooms dinoflagellate Daya Bay Scrippsiella trochoidea

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Charge Density Wave and Electron-Phonon Interaction in Epitaxial Monolayer NbSe_(2) Films

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Chinese Physics Letters 2021年第10期38卷 25-30页

作者： xuedong xie Dongjing Lin Li Zhu Qiyuan Li Junyu Zong Wang Chen Qinghao Meng Qichao Tian Shao-Chun Li Xiaoxiang Xi Can Wang Yi Zhang National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Understanding the interplay between superconductivity and charge-density wave(CDW)in NbSe_(2) is vital for both fundamental physics and future device ***,combining scanning tunneling microscopy,angleresolved photoemission spectroscopy and Raman spectroscopy,we study the CDW phase in the monolayer NbSe_(2) films grown on various substrates of bilayer graphene(BLG),SrTiO_(3)(111),and Al_(2)O_(3)(0001).It is found that the two stable CDW states of monolayer NbSe_(2) can coexist on NbSe2/BLG surface at liquid-nitrogen *** the NbSe_(2)/SrTiO_(3)(111)sample,the unidirectional CDW regions own the kinks at±41 meV and a wider gap at 4.2 *** is revealed that the charge transfer from the substrates to the grown films will influence the configurations of the Fermi surface,and induce a 130 meV lift-up of the Fermi level with a shrink of the Fermi pockets in NbSe_(2)/SrTiO_(3)(111)compared with the NbSe2/*** the temperature-dependent Raman experiments,we suggest that the electron-phonon coupling in monolayer NbSe2 dominates its CDW phase transition.

关键词： NbSe2 transition Fermi

Observation of multiple charge density wave phases in epitaxial monolayer 1T-VSe_(2) film

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Chinese Physics B 2022年第10期31卷 137-145页

作者： Junyu Zong Yang xie Qinghao Meng Qichao Tian Wang Chen xuedong xie Shaoen Jin Yongheng Zhang Li Wang Wei Ren Jian Shen Aixi Chen Pengdong Wang Fang-Sen Li Zhaoyang Dong Can Wang Jian-Xin Li Yi Zhang National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 210093China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

As a special order of electronic correlation induced by spatial modulation, the charge density wave(CDW) phenomena in condensed matters attract enormous research interests. Here, using scanning-tunneling microscopy in various temperatures, we discover a hidden incommensurate stripe-like CDW order besides the(■) CDW phase at low-temperature of 4 K in the epitaxial monolayer 1T-VSe_(2) film. Combining the variable-temperature angle-resolved photoemission spectroscopic(ARPES) measurements, we discover a two-step transition of an anisotropic CDW gap structure that consists of two parts △_(1) and△_(2). The gap part ?1 that closes around ~ 150 K is accompanied with the vanish of the(√7×√3) CDW phase. While another momentum-dependent gap part △_(2) can survive up to ~ 340 K, and is suggested to the result of the incommensurate CDW phase. This two-step transition with anisotropic gap opening and the resulted evolution in ARPES spectra are corroborated by our theoretical calculation based on a phenomenological form for the self-energy containing a two-gap structure △_(1) +△_(2), which suggests different forming mechanisms between the(√7×√3) and the incommensurate CDW phases. Our findings provide significant information and deep understandings on the CDW phases in monolayer 1T-VSe_(2) film as a two-dimensional(2D) material.

关键词： charge density waves VSe_(2) band structures STM ARPES

Converting intercalation-type cathode in spent lithium-ion batteries into conversion-type cathode

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Nano Research 2024年第5期17卷 4602-4609页

作者： Dingding Zhu Yong Su Jingzhao Chen Xiangze Ou xuedong Zhang Wen xie Yuyan Zhou Yunna Guo Qiushi Dai Peng Jia Jitong Yan Lin Geng Baiyu Guo Liqiang Zhang Yongfu Tang Qiao Huang Jianyu Huang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066000China

The widespread applications of lithium-ion batteries(LIBs)generate tons of spent ***,recycling LIBs is of paramount importance in protecting the environment and saving the *** commercialized LIBs mostly adopt layered oxides such as LiCoO_(2)(LCO)or LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)(NMC)as the cathode *** the intercalation-type spent oxides into conversion-type cathodes(such as metal fluorides(MFs))offers a valid recycling strategy and provides substantially improved energy densities for ***,two typical Co-based cathodes,LCO and LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NMC622),in spent LIBs were successfully converted to CoF_(2) and(Ni_(x)Co_(y)Mn_(z))F_(2) cathodes by a reduction and fluorination *** as converted CoF_(2) and(Ni_(x)Co_(y)Mn_(z))F_(2) delivered cell energy densities of 650 and 700 Wh/kg,*** atomic-level electron microscopy revealed that the used LCO and NMC622 were converted to highly phase pure Co metal and Ni_(0.6)Co_(0.2)Mn_(0.2) alloys in the used graphite-assisted reduction roasting,simultaneously producing the important product of Li_(2)CO_(3) using only environment friendly *** study provided a versatile strategy to convert the intercalation-type Co-based cathode in the spent LIBs into conversion-type MFs cathodes,which offers a new avenue to recycle the spent LIBs and substantially increase the energy densities of next generation LIBs.

关键词： spent lithium-ion batteries recycling energy densities conversion-type cathode

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涡轮逆向工程的三维扫描检测技术

黑龙江科技学院学报 2013年第5期23卷 479-481页

作者：谢雪冬黑龙江科技大学现代制造工程中心哈尔滨150022

为提高涡轮的三维扫描检测技术水平,采用三维扫描的相位测量技术获取涡轮增压器三维点云数据。利用三维点云数据重构涡轮检测模型,并应用GEOMAGIC QUALIFY软件对其进行3D误差分析和尺寸标注。实验结果表明:涡轮70%左右的数据点云与实物... 详细信息

为提高涡轮的三维扫描检测技术水平,采用三维扫描的相位测量技术获取涡轮增压器三维点云数据。利用三维点云数据重构涡轮检测模型,并应用GEOMAGIC QUALIFY软件对其进行3D误差分析和尺寸标注。实验结果表明:涡轮70%左右的数据点云与实物模型之间的偏差在-0.2～0.2 mm之间,能够满足涡轮检测质量要求。

关键词：逆向工程测量检测质量评价

三峡库区坡耕地农桑系统对径流拦截和氮磷流失的影响

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水土保持学报 2015年第5期29卷 66-69,94页

作者：谢雪东倪九派周川西南大学资源环境学院重庆400716

采用野外径流小区观测的方法,分析了三峡库区坡耕地5种不同的桑树配置模式(横坡垄作CK、两带等高桑+横坡垄作T1、三带等高桑+横坡垄作T2、四边桑+等高桑+横坡垄作T3、四边桑+横坡垄作T4)拦截径流和氮磷营养元素的效果。结果表明:(1)3次... 详细信息

采用野外径流小区观测的方法,分析了三峡库区坡耕地5种不同的桑树配置模式(横坡垄作CK、两带等高桑+横坡垄作T1、三带等高桑+横坡垄作T2、四边桑+等高桑+横坡垄作T3、四边桑+横坡垄作T4)拦截径流和氮磷营养元素的效果。结果表明:(1)3次采样获取数据均呈现出T3、T4处理对于坡耕地径流量的控制较对照组CK有显著作用,而T1、T2处理下显示的结果与试验预期效果有所差异;(2)对于坡耕地上氮磷元素控制,T3、T4处理相较于对照CK而言更加高效、更加明显,一定程度上控制了土壤径流流失带走土壤养分中的氮磷元素;(3)不同处理之下土壤径流中养分含量相关分析显示,磷酸、总磷、铵氮之间两两互为共进关系,总氮及铵氮含量与处理之间呈极显著负相关关系,总磷及磷酸盐含量与处理之间呈显著负相关关系。

关键词：种植模式径流拦截横坡垄作土壤氮素土壤磷素

中国西沙群岛底栖甲藻热带库里亚藻(Coolia tropicalis)的形态学、系统发育及毒性研究

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热带海洋学报 2020年第3期39卷 86-97页

作者：黄丽芬李群吕颂辉张亮谢学东暨南大学赤潮与海洋生物学研究中心广东广州510632 广东省环境监测中心广东广州510632

库里亚藻(Coolia)是一类广泛分布且具有生物毒性的海洋底栖甲藻。本研究对近年来在中国南海西沙群岛海域采集分离的4株库里亚藻,通过光镜及电镜下的形态学观察,并结合基于核糖体大亚基(large subunit,LSU)rDNA(D1-D3)和内部转录间隔区(i... 详细信息

库里亚藻(Coolia)是一类广泛分布且具有生物毒性的海洋底栖甲藻。本研究对近年来在中国南海西沙群岛海域采集分离的4株库里亚藻,通过光镜及电镜下的形态学观察,并结合基于核糖体大亚基(large subunit,LSU)rDNA(D1-D3)和内部转录间隔区(internal transcribed spacer,ITS)的序列进行系统发育分析,鉴定该4个株系为热带库里亚藻(Coolia tropicalis)。在卤虫(Artemia salina)生物毒性试验中,热带库里亚藻不同株系毒素提取液对卤虫幼虫表现出了毒性差异,XS554株系的48h半致死浓度(LC50)为1.42mg·mL^–1(约相当于1.1×10^5cells·mL^–1),5XS15株系的LC50为1.92mg·mL^–1(约相当于1×10^5cells·mL^–1)。

关键词：热带库里亚藻形态学系统发育毒性卤虫

基质细胞衍生因子1α通过Akt信号通路抑制软骨细胞凋亡并促进自噬

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四川大学学报（医学版） 2024年第1期55卷 53-59页

作者：李嘉舟谢静周学东口腔疾病防治全国重点实验室国家口腔医学中心国家口腔疾病临床医学研究中心四川大学华西口腔医院成都610041

目的探究基质细胞衍生因子1α(stromal cell-derived factor 1α,SDF-1α)对软骨细胞凋亡及自噬的影响及其潜在机制。方法从新生小鼠的膝关节中分离提取软骨细胞,以0(对照组)、50、100和200 ng/mL的SDF-1α刺激软骨细胞,CCK-8实验检测SD... 详细信息

目的探究基质细胞衍生因子1α(stromal cell-derived factor 1α,SDF-1α)对软骨细胞凋亡及自噬的影响及其潜在机制。方法从新生小鼠的膝关节中分离提取软骨细胞,以0(对照组)、50、100和200 ng/mL的SDF-1α刺激软骨细胞,CCK-8实验检测SDF-1α刺激24 h、48 h、72 h对软骨细胞活性的影响,划痕实验检测SDF-1α刺激12 h、24 h对软骨细胞迁移能力的影响,Western blot实验测定SDF-1α作用后软骨细胞内Akt信号通路相关蛋白表达变化。以0(对照组)、200 ng/mL的SDF-1α刺激软骨细胞,流式细胞术检测SDF-1α对软骨细胞凋亡的影响,透射电镜下检测SDF-1α对软骨细胞自噬的影响,并利用免疫荧光染色实验直观显示SDF-1α作用后软骨细胞内p-Akt蛋白表达及分布的差异。结果与对照组相比,50、100和200 ng/mL SDF-1α在各时点并不降低软骨细胞活性(P<0.01),且均能在24 h促进软骨细胞迁移(P<0.05)。Western blot实验结果显示,与对照组相比,50、100和200 ng/mL SDF-1α能够显著上调软骨细胞内p-Akt的蛋白表达量,Akt表达量未见明显差异。与对照组相比,流式细胞术示SDF-1α能够抑制软骨细胞凋亡(P<0.05),透射电镜观察到SDF-1α促进软骨细胞自噬(P<0.05),免疫荧光染色实验结果显示,p-Akt在软骨细胞的表达主要集中在细胞核周,SDF-1α作用后软骨细胞内p-Akt表达进一步在细胞核周部位增强。结论SDF-1α通过激活Akt信号通路,抑制软骨细胞凋亡,促进软骨细胞迁移和自噬。

关键词：基质细胞衍生因子1α 软骨细胞凋亡 Akt 自噬

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上海航运物流RFID改造的可行性

上海海事大学学报 2006年第S1期27卷 193-200页

作者：严薛栋谢尘上海海事大学物流工程学院上海200135

通过对上海航运业RFID改造可行性的深入分析,寻求一条既能使上海航运物流在运作效率上获得大幅提高、又能使其在整体服务水平上获得进一步提升的有效途径．

关键词：物流航运业改造 RFID技术集装箱运输