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Different mechanisms underlie similar species-area relationships in two tropical archipelagoes

Plant Diversity 2024年第2期46卷 238-246页

作者： Shengchun Li Tieyao Tu Shaopeng Li Xian Yang Yong Zheng liang-Dong Guo Dianxiang Zhang Lin Jiang Key Laboratory of Plant Resources Conservation and Sustainable Utilization South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China ECNU-Alberta Joint Lab for Biodiversity Study Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China School of Biological Sciences Georgia Institute of TechnologyAtlantaGA 30332USA Jiangxi Academy of Forestry Nanchang 330032China Institute of Eco-Chongming(IEC) Shanghai 202162China State Key Laboratory of Biocontrol School of EcologySun Yat-sen UniversityGuangzhou 510275China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Despite much research in the field of island biogeography,mechanisms regulating insular diversity remain ***,we aim to explore mechanisms underlying plant species-area relationships in two tropical archipelagoes in the South China *** found positive plant species-area relationships for both coral and continental ***,our results showed that different mechanisms contributed to similar plant species-area relationships between the two *** coral islands,soil nutrients and spatial distance among communities played major roles in shaping plant community structure and species *** contrast,the direct effect of island area,and to a lesser extent,soil nutrients determined plant species richness on continental ***,increasing soil nutrients availability(N,P,K)had opposite effects on plant diversity between the two *** summary,the habitat quality effect and dispersal limitation are important for regulating plant diversity on coral islands,whereas the passive sampling effect,and to a lesser extent,the habitat quality effect are important for regulating plant diversity on continental *** generally,our findings indicate that island plant species-area relationships are outcomes of the interplay of both niche and neutral processes,but the driving mechanisms behind these relationships depends on the type of islands.

关键词： Coral and continental islands Plant diversity Soil nutrients Species-area relationships The sampling effect

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Extreme Responses of An Integrated System with A Semi-Submersible Wind Turbine and Four Torus-Shaped Wave Energy Converters in Different Survival Modes

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China Ocean Engineering 2024年第05期38卷 877-892页

作者： WANG Kai LI Yu-meng ONG Muk Chen WAN Ling LI liang-bi CHENG Zheng-shun School of Ocean Engineering and Technology Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Faculty of Maritime and Transportation Ningbo University State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University SJTU Yazhou Bay Institute of Deepsea Science and Technology

Offshore wind power is a kind of important clean renewable energy and has attracted increasing attention due to the rapid consumption of non-renewable energy. To reduce the high cost of energy, a possible try is to utilize the combination of wind and wave energy considering their natural correlation. A combined concept consisting of a semi-submersible wind turbine and four torus-shaped wave energy converters was proposed and numerically studied under normal operating conditions. However, the dynamic behavior of the integrated system under extreme sea conditions has not been studied yet. In the present work, extreme responses of the integrated system under two different survival modes are evaluated. Fully coupled time-domain simulations with consideration of interactions between the semi-submersible wind turbine and the torus-shaped wave energy converters are performed to investigate dynamic responses of the integrated system, including mooring tensions, tower bending moments, end stop forces, and contact forces at the Column-Torus interface. It is found that the addition of four tori will reduce the mean motions of the yaw, pitch and surge. When the tori are locked at the still water line, the whole integrated system is more suitable for the survival modes.

关键词： combined wind and wave energy concept extreme response survival mode wave energy converter

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Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

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Materials Futures 2024年第1期3卷 95-127页

作者： Yuhang Ma Huaxin Yi Huanrong liang Wan Wang Zhaoqiang Zheng Jiandong Yao Guowei Yang State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterSchool of Materials Science&EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Sun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongPeople’s Republic of China

Detecting light from a wealth of physical degrees of freedom(***,intensity,polarization state,phase,etc)enables the acquirement of more comprehensive *** the past two decades,low-dimensional van der Waals materials(vdWMs)have established themselves as transformative building blocks toward lensless polarization optoelectronics,which is highly beneficial for optoelectronic system *** review provides a comprehensive overview on the recent development of low-dimensional vdWM polarized *** begin with,the exploitation of pristine 1D/2D vdWMs with immanent in-plane anisotropy and related heterostructures for filterless polarization-sensitive photodetectors is ***,we have systematically epitomized the various strategies to induce polarization photosensitivity and enhance the degree of anisotropy for low-dimensional vdWM photodetectors,including quantum tailoring,construction of core–shell structures,rolling engineering,ferroelectric regulation,strain engineering,etc,with emphasis on the fundamental physical *** that,the ingenious optoelectronic applications based on the low-dimensional vdWM polarized photodetectors,including multiplexing optical communications and enhanced-contrast imaging,have been *** the end,the current challenges along with the future prospects of this burgeoning research field have been *** the whole,the review depicts a fascinating landscape for the next-generation high-integration multifunctional optoelectronic systems.

关键词： polarization-discriminating photodetectors 1D van der Waals materials

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大枝修剪矮化杨梅树体技术研究

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浙江农业学报 2006年第6期18卷 417-420页

作者：戚行江梁森苗郑锡良求盈盈王裕通邱立军谢小波浙江省农业科学院园艺研究所浙江杭州310021 浙江省舟山市定海区农林局浙江定海316000

研究了不同时期大枝修剪对12年生晚稻杨梅树体矮化的效应,其中夏季效果最好。夏季大枝修剪后第2年,树冠高度为3.72 m,比对照降低了76.88%;平均单果重12.66 g,可溶性固形物含量13.01%,株产量86.2 kg,站立采摘量75.9 kg,分别比对照增加15.... 详细信息

研究了不同时期大枝修剪对12年生晚稻杨梅树体矮化的效应,其中夏季效果最好。夏季大枝修剪后第2年,树冠高度为3.72 m,比对照降低了76.88%;平均单果重12.66 g,可溶性固形物含量13.01%,株产量86.2 kg,站立采摘量75.9 kg,分别比对照增加15.30%,11.20%,29.62%,236.45%。杨梅树体矮化,产量增加,品质提高,采摘带来的安全隐患大大降低。

关键词：晚稻杨梅大枝修剪矮化效应

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Adhesion property of AlCrNbSiTi high-entropy alloy coating on zirconium:experimental and theoretical studies

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Nuclear Science and Techniques 2024年第8期35卷 79-91页

作者： Bao‑liang Zhang Wen‑Guan Liu Meng‑He Tu Can Fang Yan Liu Yu‑Hui Wang Yong Hu Hui Wang China Institute of Atomic Energy Beijing 102413China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China

Experimental scratch tests and first-principles calculations were used to investigate the adhesion property of AlCrNbSiTi high-entropy alloy(HEA)coatings on zirconium *** HEA and Cr coatings were deposited on Zr alloy substrates using multi-arc ion plating technology,and scratch tests were subsequently conducted to estimate the adhesion property of the *** results indicated that Cr coatings had better adhesion strength than HEA coatings,and the HEA coatings showed *** special quasi-random structure approach was used to build HEA models,and Cr/Zr and HEA/Zr interface models were employed to investigate the cohesion between the coatings and Zr substrate using first-principles *** calculated interface energies showed that the cohesion between the Cr coating and the Zr substrate was stronger than that of the HEA coating with *** contrary to Al or Si in the HEA coating,Cr,Nb,and Ti atoms binded strongly with Zr *** on the calculated elastic constants,it was found that low Cr and high Al content decreased the mechanical performances of HEA ***,this study demonstrated the utilization of a combined approach involving first-principles calculations and experimental studies for future HEA coating development.

关键词： High-entropy alloy coating Cr coating Adhesion property Scratch test First-principles calculation

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高速公路隧道接近段视错觉控速标线信息感知研究

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公路交通科技 2024年第4期41卷 146-156页

作者：梁波秦杨张红杰刘涛文森重庆交通大学土木工程学院重庆400074 重庆交通大学山区桥梁及隧道工程国家重点实验室重庆400074 泸州市交通建设工程服务中心四川泸州646000 招商局重庆交通科研设计院有限公司重庆400067

由于高速公路隧道洞口处存在黑洞效应,且隧道内外限速存在差异,因此,高速公路隧道洞口处成为事故高发路段。为了改善高速公路隧道洞口处行车的安全舒适性,常在隧道接近段布设视错觉控速标线给予驾驶员视觉冲击,起到提醒驾驶员安全减速... 详细信息

由于高速公路隧道洞口处存在黑洞效应,且隧道内外限速存在差异,因此,高速公路隧道洞口处成为事故高发路段。为了改善高速公路隧道洞口处行车的安全舒适性,常在隧道接近段布设视错觉控速标线给予驾驶员视觉冲击,起到提醒驾驶员安全减速的作用。本研究利用UC-win/Road软件建立仿真模型,通过室内模拟驾驶平台进行仿真试验,利用眼动仪对驾驶员视觉信息感知进行测量,选取物理指标速度降低率、最大减速度值和生理指标瞳孔直径变化率作为评价指标。基于加权RSR综合评价法,分别对行车道上不同闪现率的车速增加式视错觉控速标线(横向形、鱼刺形)和车道压缩式视错觉控速标线(正梳齿形、斜梳齿形)进行减速效果评价。结果表明:4种视错觉控速标线都具有影响驾驶员感知信息的能力,其影响程度从大到小为鱼刺形、横向形、正梳齿形、斜梳齿形;相同类型不同闪现率的视错觉控速标线减速效果存在差异性,相同闪现率下车速增加式视错觉控速标线减速效果较车道压缩式视错觉控速标线好;在满足行车舒适度要求下,快车道推荐布设闪现率为8 Hz的横向形视错觉控速标线,慢车道推荐布设闪现率为8 Hz的鱼刺形视错觉控速标线。

关键词：隧道工程视错觉控速标线加权RSR评价法高速公路隧道接近段信息感知

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Electrochemical and colorimetric dual-signal detection of Staphylococcus aureus enterotoxin B based on AuPt bimetallic nanoparticles loaded Fe-N-C single atom nanocomposite

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Food Science and Human Wellness 2024年第4期13卷 2025-2035页

作者： Huan liang Hongcheng Liu Haojian Lin Guobao Ning Xiaokang Lu Siying Ma Fei Liu Hui Zhao Canpeng Li School of Chemical Science and Technology Yunnan UniversityKey Laboratory of Medicinal Chemistry for Natural ResourceMinistry of EducationKunming 650091China Institute of Quality Standard and Testing Technology Yunnan Academy of Agricultural ScienceSupervision and Testing Center for Farm Product QualityMinistry of AgricultureKunming 650223China State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Laboratory for Conservation and Utilization of Bio-resource Yunnan UniversityKunming 650091China

sensitive detection of Staphylococcus aureus enterotoxin B(SEB)is of importance for preventing food poisoning from threatening human *** this work,an electrochemical and colorimetric dual-signal detection assay of SEB was *** probe(Ab2/AuPt@Fe-N-C)was bound to SEB captured by Ab1,where the Ab2/AuPt@Fe-N-C triggered methylene blue degradation and resulted in the decrease of electrochemical ***,the probe catalyzed the oxidation of 3,3’,5,5’-tetramethyl biphenyl to generate a colorimetric absorbance at 652 *** the target was captured and formed a sandwich-like complex,the color changed from colorless to *** detection by colorimetric and electrochemical methods showed a linear relationship in the concentration ranges of 0.0002-10.0000 and 0.0005-10.0000 ng/mL,with limits of detection of 0.0667 and 0.1670 pg/mL,*** dual-signal biosensor was successfully used to detect SEB in milk and water samples,which has great potential in toxin detection in food and the environment.

关键词： Staphylococcus aureus enterotoxin Electrochemical immunosensor Colorimetric assay MOF@borophene composite Dual-functional Fe-N-C signal atom catalyst

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A171/GO联合改性UHMWPE纤维嵌入NBR阻尼薄膜复合材料的界面结合性能研究

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化工新型材料 2024年第5期52卷 167-171,175页

作者：王风全梁森田程刘龙郭健青岛理工大学机械与汽车工程学院青岛266520

超高分子量聚乙烯纤维(UHMWP)表面光滑且由于特殊的分子结构使得表面化学活性较低,在与各种基体制备复合材料时难以得到理想的层间力学性能。为改善UHMWPE纤维与阻尼材料丁腈橡胶(NBR)之间的界面结合性能,首先使用酸性高锰酸钾溶液对UHM... 详细信息

超高分子量聚乙烯纤维(UHMWP)表面光滑且由于特殊的分子结构使得表面化学活性较低,在与各种基体制备复合材料时难以得到理想的层间力学性能。为改善UHMWPE纤维与阻尼材料丁腈橡胶(NBR)之间的界面结合性能,首先使用酸性高锰酸钾溶液对UHMWPE纤维液相进行氧化,在纤维表面引入极性含氧基团;然后以乙烯基三甲氧基硅烷(A171)作为中间偶联层在UHMWPE纤维上接枝氧化石墨烯(GO),制备出GO功能化UHMWPE纤维,使得纤维表面粗糙且极性显著提高,改善了UHMWPE纤维与NBR之间的层间性能。借助分子动力学模拟软件Materials Studio(MS)构建各材料模型,从结合能、自由能等微观角度预测实验方案的可行性,并根据模拟结果制作实验试件,最后通过红外光谱分析、电子显微镜、H抽出、层间剪切实验来测试表征试件性能。模拟与实验结果表明,经改性处理的UHMWPE纤维分子短链与NBR分子间结合能提高了4.785kcal/mol;UHMWPE纤维从NBR中抽出的H抽出力提高了67.3%;使用改性后纤维制作的嵌入式共固化阻尼复合材料板阻尼层的层间剪切力提高了43.2%。

关键词：超高分子量聚乙烯氧化石墨烯接枝改性分子动力学界面结合性能

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粉红单端孢霉发酵产物中具有细胞毒活性的二萜

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天然产物研究与开发 2024年第5期36卷 793-797页

作者：郝珂冉黄德森吴怡婷邢靓西北农林科技大学化学与药学院、陕西省天然产物化学生物学重点实验室杨凌712100 百色学院化学与环境工程学院、广西城市水环境重点实验室百色533000

为寻找结构多样的具有细胞毒活性的真菌代谢物,采用多种色谱分离技术对粉红单端孢霉(Trichothecium roseum)固体发酵代谢产物成分进行分离纯化,得到5个化合物,利用HR-ESI-MS、1H NMR和13 C NMR等谱学技术对其结构进行鉴定,分别确定为mel... 详细信息

为寻找结构多样的具有细胞毒活性的真菌代谢物,采用多种色谱分离技术对粉红单端孢霉(Trichothecium roseum)固体发酵代谢产物成分进行分离纯化,得到5个化合物,利用HR-ESI-MS、1H NMR和13 C NMR等谱学技术对其结构进行鉴定,分别确定为melanocane F(1)、rosenonolactone(2)、desoxyrosenonolactone(3)、rosonolactone(4)与2α-hydroxyisocupressic acid(5),均为二萜类化合物,其中化合物1为新化合物。对所有化合物进行乳腺癌MCF-7细胞毒活性研究,结果表明化合物1和5抑制MCF-7生长活性较好。

关键词：粉红单端孢霉次级代谢产物海松烷型二萜细胞生长抑制

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Fight or flee,a vital choice for Clostridioides difficile

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mLife 2024年第1期3卷 14-20页

作者： Ji Zeng Sshuying Fang Jinquan Guo Min Dong Guo-Bao Tian liang Tao School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhouChina Department of Brest Surgery Panyu Central Hospital.GuangzhouChina Department of Microbiology Harvard Medical SchoolBostonMassachusettsUSA Department of Urology Boston Children's HospitalHarvard Medical SchoolBostonMassachusettsUSA Department of Microbiology Zhongshan School of MedicineSun Yat-sen UniversityGuangzhouChina Advanced Medical Technology Center The First Affiliated HospitalZhongshan School of MedicineSun Yat-sen UniversityGuangzhouChina Key Laboratory of Tropical Diseases Control(Sun Yat-sen University) Ministry of EducationGuangzhouChina School of Medicine Xizang Minzu UniversityXianyangChina Center for Infectious Disease Research Westlake Laboratory of Life Sciences and BiomedicineWestlake UniversityHangzhouChina Research Center for Industries of the Future School of Life SciencesWestlake UniversityHangzhouChina

Clostridioides difficile is a leading cause of healthcare-associated infections,causing billions of economic losses every *** symptoms range from mild diarrhea to life-threatening damage to the *** and recurrence of *** infection(CDl)are mediated by the metabolically dormant spores,while the virulence of *** is mainly due to the two large clostridial toxins,TcdA and *** toxins or forming spores are two different strategies for *** to cope with harsh environmental *** is of great significance to understand the molecular mechanisms for *** to skew to either of the cellular ***,we summarize the current understanding of the regulation and connections between toxin production and sporulation in *** and further discuss the potential solutions for yet-to-be-answered questions.

关键词： C.difficile sporulation TcdA TcdB toxin production

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