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| 1 | Light carbon isotope events of foraminifera attributed to methane release from gas hydrates on the continental slope, northeastern South China Sea显示文摘In 2013, the China Geological Survey and Guangzhou Marine Geological Survey conducted the second Chinese gas hydrate expedition in the northern South China Sea(SCS) and successfully obtained visible gas hydrate samples. Five of the thirteen drilling sites were cored for further research. In this work, Site GMGS2-08 is selected for the stable isotopic analysis of foraminifera present in the boreholes in order to reveal the carbon isotopic characteristics of the foraminifera and their response to methane release in the gas hydrate geological system. Our results show that the methane content at Site GMGS2-08 is extremely high, with headspace methane concentrations up to 39300 μmol L^(-1). The hydrocarbon δ^(13)C values, ranging from-69.4‰ to-72.3‰ PDB, distinctly indicate biogenic generation. Based on the δD analytical results(^(-1)83‰ to^(-1)85‰ SMOW), headspace methane is further discriminated to be microbial gas, derived from CO_2 reduction. By isotopic measurement, five light δ^(13)C events are found in the boreholes from Site GMGS2-08, with foraminiferal δ^(13)C values being apparently lower than the normal variation range found in the glacial-interglacial cycles of the SCS. The δ^(13)C values of benthic Uvigerina peregrina are extremely depleted(as low as^(-1)5.85‰ PDB), while those of planktonic Globigerinoides ruber reach-5.68‰ PDB. Scanning electron micrograph(SEM) studies show that foraminiferal tests have experienced post-depositional alteration, infilled with authigenic carbonate, and the diagenetic mineralization is unlikely to be related to the burial depths. The correlation calculation suggests that the anaerobic oxidation of organic matter has only weak influences on the δ^(13)C composition of benthic foraminifera. This means that the anomalous δ^(13)C depletions are predominantly attributed to the overprinting of secondary carbonates derived from the anaerobic oxidation of methane(AOM). Furthermore, the negative δ^(13)C anomalies, coupled with the positive δ18O anomalies observed at Site GMGS2-08, are most likely the critical pieces of evidence for gas hydrate dissociation in the geological history of the study area. | ZHUANG Chang CHEN Fang CHENG SiHai LU HongFeng WU Cong CAO Jun DUAN Xiao | 2016 | Science China Earth Sciences2016，59，10： | 4 |
| 2 | Intact Polar and Core Tetraether Lipids in Sediments from the Haiyang 4 Cold-seep of the Northern South China Sea and their Implications显示文摘A number of cold seeps have been discovered in the northern South China Sea(SCS) including the Haiyang 4 cold-seep area where Core 973-5 was collected. Intact polar lipids(IPLs) and core lipids(CLs) were analyzed separately in sediments from Core 973-5. The most abundant lipid biomarkers were isoprenoidal GDGTs(iso GDGTs), with Crenarchaeol and GDGT-0 predominating. IPL-iso GDGTs and CL-iso GDGTs were mainly derived from Thaumarchaeota. IPL-iso GDGTs were mainly produced and retained in situ thus containing most of the in situ microbiological information. Branched GDGTs were predominantly derived from generated in marine production, and mixed with some terrestrial inputs. All IPLs groups presented a high value in the sulfate-methane transition zone(SMTZ). Furthermore, IPL and CL-MI, IPL-R;showed the highest values within the SMTZ, while IPL and CL-R;had the lowest values at the SMTZ, suggesting that the contribution of Methanophila and methanogenic to GDGTs increased, while the contribution of ammonia-oxidizing Archaea to GDGTs decreased at the SMTZ. | LI Yuejiao SU Xin JIAO Lu CHEN Fang CHENG Sihai | 2022 | Acta Geologica Sinica(English Edition)2022，96，2： | 1 |
| 3 | Variable step-size adaptive filtering algorithm based on an exponent sin function显示文摘This paper proposes a robust adaptive filter based on the exponent sin cost to improve the capability against Gaussian or multiple types of non-Gaussian noises of the adaptive filtering algorithm when dealing with time-varying/time-invariant linear systems function exponent sin(ExpSin).Then a variable step-size(VSS)-ExpSin algorithm is extended further.Besides,the stepsize,the convergence,and the steady-state performance of the proposed algorithm are validated experimentally.The Monte Carlo simulation results of linear system identification illustrate the principle and efficiency of this proposed adaptive filtering algorithm.Results suggest that the proposed adaptive filtering algorithm has superior performance when estimating the unknown linear systems under multiple-types measurement noises. | Guan Sihai Cheng Qing Zhao Yong Liu Fangyao | 2023 | The Journal of China Universities of Posts and Telecommunications2023，30，1： | 0 |
| 4 | Manipulation of π-aromatic conjugation in two-dimensional Sn-organic materials for efficient lithium storage显示文摘Sn-based materials are promising candidates for lithium storage but suffer generally from huge volume change during the(de)lithiation processes.Sn-organic materials with monodispersed Sn centers surrounded by lithium active ligands can alleviate the volume change of anode materials based on reversible(de)lithiation processes.However,the structural factors governing the kinetics of lithium storage and utilization efficiency of active sites are not well understood to date.Herein,we report three two-dimensional Sn-organic materials with enhanced lithium storage performance by manipulation ofπ-aromatic conjugation of the ligands.The increasingπ-aromatic conjugation plays a key role in promoting efficient lithium storage,and the volume expansion during the(de)lithiation reaction is suppressed in these Sn-organic materials.This work reveals that theπ-aromatic conjugation of the ligand is crucial for improving the kinetics of lithium storage and the utilization of active sites in metalorganic materials with minimised volume expansion. | Jingwei Liu Jialong Jiang Qingyang Zhou Zhonghang Chen Runhao Zhang Xiufang Xu Xue Han Sihai Yang Zhen Zhou Peng Cheng Wei Shi | 2023 | eScience2023，3，2： | 0 |
| 5 | Dynamic-static coupled sensing of trace biomarkers by molecularly imprinted metal-organic frameworks显示文摘Accommodating target analytes within the pores of metal-organic frameworks(MOFs)to improve the sensing performance is an important but challenging task.Here,we report a novel molecular imprinting strategy to create target recognition sites in a tailored multicomponent MOF with the inter-ligand synergistic antenna effect to lanthanide ions,enabling selective recognition of trace biomarkers,which is critical to the early diagnosis of age-related diseases in blood samples with high sensitivity and ultralow limit of detection(LOD)of 69 nmol L^(-1).Compared with MOF-based sensors without imprinted recognition sites,the significantly enhanced sensing performance(both sensitivity and LOD)was attributed to a dynamic-static coupled sensing mechanism:the dynamic interactions involve concentrating the trace biomarkers at the imprinted recognition sites to enhance the sensing performance at ultralow concentration,and the static interactions are derived from electron/energy exchange between the molecularly imprinted MOF and the biomarker to govern the sensing performance.This work establishes a new molecular imprinting strategy to attain advanced materials for sensing trace bio-analytes. | Hui Min Zongsu Han Tiankai Sun Kunyu Wang Jun Xu Peiyu Yao Sihai Yang Peng Cheng Wei Shi | 2023 | Science China Chemistry2023，66，12： | 0 |
| 6 | A Multicenter Metal–Organic Framework for Quantitative Detection of Multicomponent Organic Mixtures显示文摘Instant recognition and quantification of multicomponent organicmixtures,especially the oneswith similar characteristics,remains a key challenge in the chemical industry.Although luminescence sensing is considered a rapid and facile method for the detection of various chemical substances,the simultaneous and quantitative detection of three or more components has not yet been achieved.Herein,we report a rationally designed white-light-emitting metal–organic framework(MOF)EuTb@NKU-102,and demonstrate its application in the simultaneous discrimination of multicomponent organic mixtures. | Zongsu Han Kunyu Wang Yinlin Chen Jiangnan Li Simon JTeat Sihai Yang Wei Shi Peng Cheng | 2022 | CCS Chemistry2022，4，10： | 0 |
| 7 | Atypical manifestations of acute coronary syndrome—throat discomfort:a multi-center observational study显示文摘To present the clinical characteristics and the misdiagnosis rate of acute coronary syndrome manifested primarily as throat discomfort,we conducted a multicentric and retrospective study in the cardiology and otorhinolaryngology departments.Records of patients with primary complaint of throat discomfort,absence of chest pain at onset,and an ultimate diagnosis of acute coronary syndrome,as well as patients with pharyngitis(as controls)were collected from May 2015 to April 2016.The patients’main manifestations were compared.Logistic regression results showed that chest tightness,dyspnea,perspiring,and exertional throat symptoms were significantly associated with acute coronary syndrome,with odds ratios of 8.3(95%CI 2.2–31.5),10.9(95%CI 1.8–66.9),25.4(95%CI 3.6–179.9),and 81.2(95%CI 13.0–506.7).A total of 25(56.82%)out of 44 acute coronary syndrome patients,who were first admitted to the otorhinolaryngology department,were misdiagnosed,with a 12%(3/25)mortality rate.Throat discomfort can be the principal manifestation of acute coronary syndrome.Such patients exhibit high misdiagnosis and mortality rates.Exertional throat symptoms,chest tightness,perspiring,and dyspnea were important indicators of acute coronary syndrome in patients whose main complaint was throat discomfort.The awareness of this condition will result in prompt diagnosis and reduce morbidity and mortality. | Yanqing Fang Xiaoting Cheng Wenhui Peng Xueying Chen Chunping Tang Qiusheng Huang Sihai Wu Yibo Huang Fanglu Chi Matthew RNaunheim Huawei Li Bing Chen Yilai Shu | 2022 | Frontiers of Medicine2022，16，4： | 0 |
| 8 | Observation of oxygen evolution over a {Ni12}-cluster-based metal-organic framework显示文摘The development of efficient electrocatalysts based on non-noble metals for oxygen evolution reaction(OER) remains an important and challenging task. Multinuclear transition-metal clusters with high structural stability are promising OER catalysts but their catalytic role is poorly understood. Here we report the crystallographic observation of OER activity over robust {Ni12}-clusters immobilised in a porous metal-organic framework, NKU-100, by single-crystal X-ray diffraction as a function of external applied potential. We observed the aggregation of confined oxygen species around the {Ni12}-cluster as a function of applied potential during the electrocatalytic process. The refined occupancy of these oxygen species shows a strong correlation with the variation of current density. This study demonstrates that the enrichment of oxygen species in the secondary coordination sphere of multinuclear transition-metal clusters can promote the OER activity. | Zongsu Han Zheng Yan Kunyu Wang Xinchen Kang Kai Lv Xiaoping Zhang Zhen Zhou Sihai Yang Wei Shi Peng Cheng | 2022 | Science China Chemistry2022，65，6： | 0 |
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