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Chinese Chemical Letters 2024年第2期35卷 411-414页

作者： sen qiao Kunquan Chen Qiang Liu Zhixiang Wang Xiangyu Chen School of Chemical Sciences University of the Chinese Academy of SciencesBeijing 100049China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou 256606China

A charge transfer complex(CTC)-enabled photoreduction of ether phosphonium salts for the generation of oxyalkyl radicals was described.The photoreduction provides a convenient method to achieve selective oxyalkylation of enamides with broad substrate scope.The method features operational simplicity,mild and inherent green conditions.

关键词： Enamides Phosphonium salts Ethers Charge transfer complex Visible light

Cooperative Covert Communication in Multi-Antenna Broadcast Channels

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China Communications 2024年第6期21卷 246-260页

作者： qiao sen Liu Guangjie Ji Xiaopeng Liu Weiwei School of Electrical and Information Engineering Nanjing University of Information Science and TechnologyNanjing 210044China School of Automation Nanjing University of Science and TechnologyNanjing 210094China

With the gradual popularization of 5G communications,the application of multi-antenna broadcasting technology has become widespread.Therefore,this study aims to investigate the wireless covert communication in the two-user cooperative multi-antenna broadcast channel.We focus on the issue that the deteriorated reliability and undetectability are mainly affected by the transmission power.To tackle this issue,we design a scheme based on beamforming to increase the reliability and undetectability of wireless covert communication in the multi-antenna broadcast channel.We first modeled and analyzed the cooperative multi-antenna broadcasting system,and put forward the target question.Then we use the SCA(successive convex approximation)algorithm to transform the target problem into a series of convex subproblems.Then the convex problems are solved and the covert channel capacity is calculated.In order to verify the effectiveness of the scheme,we conducted simulation verification.The simulation results show that the proposed beamforming scheme can effectively improve the reliability and undetectability of covert communication in multi-antenna broadcast channels.

关键词： beamforming covert communication multi-antenna broadcast channels OFDM

Sulfide-driven nitrous oxide recovery during the mixotrophic denitrification process

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Journal of Environmental Sciences 2023年第3期125卷 443-452页

作者： Cong Yu sen qiao Jiti Zhou Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education China)School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

We propose a novel sulfide-driven process to recover N_(2)O during the traditional denitrification process.The optimum initial sulfide concentration was 120 mg/L,and the N_(2)O percentage in the gaseous products (N_(2)O+N_(2)) was up to 82.9%.Moreover,sulfide involved in denitrification processes could substitute for organic carbon as an electron donor,e.g.,1g sulfide was equivalent to 0.5-2 g COD when sulfide was oxidized to sulfur and sulfate.The accumulation of N_(2)O was mainly due to the inhibiting effect of sulfide on nitrous oxide reductase (N_(2)OR),which was induced by the supply insufficiency of electrons from cytochrome c (cyt c) to N_(2)OR.When the initial sulfide concentration was 120 mg/L,the N_(2)OR activity was only 36.8%of its original level.According to the results of cyclic voltammetry,circular dichroism spectra and fluorescence spectra,significant changes in the conformations and protein structures of cyt c were caused by sulfide,and cyt c completely lost its electron transport capacity.This study provides a new concept for N_(2)O recovery driven by sulfide in the denitrification process.In addition,the findings regarding the mechanism of the inhibition of N_(2)OR activity have important implications both for reducing emissions of N_(2)O and recovering N_(2)O in the sulfide-driven denitrification process.

关键词： N_(2)O recovery N_(2)OR inhibition Cytochrome c Electron transfer capacity

Mechanism Exploration of Euphorbia fischeriana Steud. for Liver Cancer Based on Aspartic Acid Identification in Metabolomics

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Chinese Journal of Integrative Medicine 2024年第6期30卷 507-514页

作者： ZHAO Jing TIAN Xin-chen ZHANG Jia-qi HUANG Chen SUN Yan qiao sen JIANG Shu-long Clinical Medical Laboratory Center Jining First People’s HospitalJiningShandong Province272000China Cheeloo College of Medicine Shandong UniversityJinan250000China

Objective:To investigate the anti-liver cancer effects and aspartic acid(Asp)-related action mechanism of Euphorbia fischeriana Steud.(LD).Methods:The mice model of liver cancer was established by injection of H22 cells.After 5 days,mice were randomly divided into model group,sorafenib group(20 mg/kg),LD high-dose(LDH,1.36 g/kg) group,LD medium-dose(LDM,0.68 g/kg) group,and LD low-dose(LDL,0.34 g/kg)group,10 mice each group.Drugs were intragastrically administered to the mice once daily for 10 days,respectively.Body weight,tumor size and tumor weight were recorded.Hepatic index was calculated.Pathological changes of liver cancer tissues were evaluated by hematoxylin and eosin staining and TUNEL staining.Liquid chromatography-mass spectrometer was used to analyze different metabolites between the model and LDH groups.Results:After LD treatment,tumor weight,tumor size and hepatic index were reduced compared with the model group.Necrocytosis and karyorrhexis of tumor cells were found.Moreover,61 differential metabolites(18 up-regulated,43 down-regulated) were affirmed and 20 pathways of KEGG(P<0.05) were gotten.In addition,Bel-7402,HepG2 and H22 cell viabilities were significantly increased after adding Asp into the medium.And then,the cell proliferation effect induced by Asp was ameliorated by LD.Conclusion:The anti-liver cancer efficacy of LD extract was validated in H22 mice model,and inhibition of Asp level might be the underlying mechanism.

关键词： liver cancer Euphorbia fischeriana Steud. aspartic acid metabolomics

跨越数字鸿沟:智能手机对老年人劳动参与的影响

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中南民族大学学报（人文社会科学版） 2024年第3期44卷 104-112,185,186页

作者：向运华金巧森武汉大学社会保障研究中心湖北武汉430072

促进老年人劳动参与是应对人口老龄化挑战、实现积极老龄化的重要举措之一,智能手机的普及为提高老年人劳动参与概率与质量带来新的可能。文章基于2016年中国老年社会追踪调查数据,探究了智能手机使用对老年人劳动参与的作用和机制。研... 详细信息

促进老年人劳动参与是应对人口老龄化挑战、实现积极老龄化的重要举措之一,智能手机的普及为提高老年人劳动参与概率与质量带来新的可能。文章基于2016年中国老年社会追踪调查数据,探究了智能手机使用对老年人劳动参与的作用和机制。研究发现:智能手机的使用能够显著提高老年人劳动参与概率,采用稳健性估计与工具变量克服内生性问题后,该结论依然成立;影响机制的检验结果显示,智能手机使用通过扩大和巩固老年人的社会网络,进而促进了其劳动参与。因此,推进智能手机的普及和适老改造工作,提高老年人的智能手机使用能力,巩固和拓展老年人社会网络关系,有助于老年人跨越数字鸿沟,强化智能手机在老年人劳动参与过程中的促进作用。

关键词：智能手机使用劳动参与社会网络积极老龄化

Opportunities and challenges of three-dimensional printing technology in pharmaceutical formulation development

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Acta Pharmaceutica Sinica B 2021年第8期11卷 2488-2504页

作者： Mengsuo Cui Hao Pan Yupei Su Dongyang Fang sen qiao Pingtian Ding Weisan Pan Department of Pharmaceutics School of PharmacyShenyang Pharmaceutical UniversityShenyang 110016China School of Pharmacy Liaoning University66 Chongshan Middle RoadShenyang 110036China

Three-dimensional printing is a technology that prints the products layer-by-layer,in which materials are deposited according to the digital model designed by computer aided design(CAD)software.This technology has competitive advantages regarding product design complexity,product personalization,and on-demand manufacturing.The emergence of 3 D technology provides innovative strategies and new ways to develop novel drug delivery systems.This review summarizes the application of 3 D printing technologies in the pharmaceutical field,with an emphasis on the advantages of 3 D printing technologies for achieving rapid drug delivery,personalized drug delivery,compound drug delivery and customized drug delivery.In addition,this article illustrates the limitations and challenges of 3 D printing technologies in the field of pharmaceutical formulation development.

关键词： Three-dimensional printing technology Drug delivery system Pharmaceutical Personalized medicine Additive manufacturing On-demand manufacturing Advantages Limitations and challenges

N-Calculator与NUFER耦合模型和组合预测法在食物氮足迹研究中的应用

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安全与环境学报 2024年第2期24卷 778-786页

作者：乔森赵骏廷郑洪波大连理工大学环境学院辽宁大连116024

为改善传统N-Calculator模型的局限性,加强食物氮足迹核算结果与环境影响的联系,提高活性氮管理预见性,将N-Calculator模型与食物系统养分流动(Nutrient Flows in Food Chains,Environment and Resources Use,NUFER)模型进行耦合,以估... 详细信息

为改善传统N-Calculator模型的局限性,加强食物氮足迹核算结果与环境影响的联系,提高活性氮管理预见性,将N-Calculator模型与食物系统养分流动(Nutrient Flows in Food Chains,Environment and Resources Use,NUFER)模型进行耦合,以估算我国2001—2020年人均食物氮足迹,建立组合预测体系。结果显示:2001—2020年,我国人均食物氮足迹由16.04 kg N/a增至18.95 kg N/a;全国食物氮足迹由20.47 Mt N/a增至26.76 Mt N/a;居民饮食结构正由以植物源食物为主的低氮消费模式转向以动物源食物为主的高氮消费模式;食物生产过程产生的活性氮的最终归宿为大气(64.3%)、水体和深层土壤(35.7%);我国食物氮足迹与人均可支配收入、城市化率、动物源食物消费氮占比呈正相关性,与恩格尔系数呈负相关性;未来10 a我国人均食物氮足迹呈增长趋势,预测结果显示年均增幅为0.16 kg N/a。

关键词：环境学食物氮足迹活性氮 N-Calculator模型 NUFER模型组合预测模型

Start-up of the anammox process from the conventional activated sludge in a hybrid bioreactor

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Journal of Environmental Sciences 2012年第6期24卷 1083-1090页

作者： Xiumei Duan Jiti Zhou sen qiao Xin Yin Tian Tian Fangdi Xu Key Laboratory of Industrial Ecology and Environmental Engineering MOESchool of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

The anaerobic ammonium oxidation （anammox） process was successfully started up from conventional activated sludge using a hybrid bioreactor within 2 months.The average removal efficiencies of ammonia and nitrite were both over 80%,and the maximum total nitrogen removal rate of 1.85 kg N/（m^3 ·day） was obtained on day 362 with the initial sludge concentration of 0.7 g mixed liquor suspended solids （MLSS）/L.Scanning electron microscope （SEM） observation of the granular sludge in the hybrid reactor clearly showed a high degree of compactness and cell sphericity,and the cell size was quite uniform.Transmission electron microscope photos showed that cells were round or oval,the cellular diameter was 0.6-1.0 μm,and the percentage of the anammoxosome compartment was 51%-85% of the whole cell volume.Fluorescence in situ hybridization analysis （FISH） indicated that anammox bacteria became the dominant population in the community （accounting for more than 51% of total bacteria on day 250）.Seven planctomycete 16S rRNA gene sequences were present in the 16S rRNA gene clone library generated from the biomass and affiliated to Candidatus Kuenenia stuttgartiensis and Candidatus Brocadia sp.,a new anammox species.In addition,the average effluent suspended solid （MLSS） concentrations of outlets I （above the non-woven carrier） and II （below the non-woven carrier） were 0.0009 and 0.0035 g/L,respectively.This showed that the non-woven carrier could catch the biomass effectively,which increased biomass and improved the nitrogen removal rate in the reactor.

关键词： anammox hybrid bioreactor fluorescence in situ hybridization 16S rRNA gene clone library

Active source monitoring at the Wenchuan fault zone:coseismic velocity change associated with aftershock event and its implication

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Earthquake Science 2014年第6期27卷 599-606页

作者： Wei Yang Hongkui Ge Baoshan Wang Jiupeng Hu Songyong Yuan sen qiao Key Laboratory of Seismic Observation and Geophysical Imaging Institute of Geophysics China Earthquake Administration Unconventional Natural Gas Institute China University of Petroleum

With the improvement of seismic observation system, more and more observations indicate that earthquakes may cause seismic velocity change. However, the amplitude and spatial distribution of the velocity variation remains a controversial issue. Recent active source monitoring carried out adjacent to Wenchuan Fault Scientific Drilling （WFSD） revealed unambiguous coseismic velocity change associated with a local M8 5.5 earthquake. Here, we carry out forward modeling using two-dimensional spectral element method to further investigate the amplitude and spatial distribution of observed velocity change. The model is well constrained by results from seismic reflection and WFSD coring. Our model strongly suggests that the observed coseismic velocity change is localized within the fault zone with width of ~ 120 m rather than dynamic strong ground shaking. And a velocity decrease of -2.0 % within the fault zone is required to fit the observed travel time delay distribution, which coincides with rock mechanical experiment and theoretical modeling.

关键词： Wenchuan fault zone Coseismic velocity change Accurately Controlled Routinely Operated Seismic Source （ACROSS） Active monitoring Forward modeling

A novel sequence batch membrane carbonation photobioreactor developed for microalgae cultivation

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Frontiers of Environmental Science & Engineering 2019年第6期13卷 127-136页

作者： Caiyun Hou sen qiao Yue Yang Jiti Zhou Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

In this study,a novel sequence batch membrane carbonation photobioreactor was developed for microalgae cultivation.Herein,membrane module was endowed functions as microalgae retention and CO2 carbonation.The results in the batch experiments expressed that the relatively optimal pore size of membranes was 30 nm,photosynthetically active radiation was 36 W/m^2 and the CO2 concentration was 10%(v/v).In long-term cultivation,the microalgal concentration separately accumulated up to 1179.0 mg/L and 1296.4 mg/L in two periods.The concentrations of chlorophyll a,chlorophyll b and carotenoids were increased about 23.2,14.9 and 6.3 mg/L respectively in period I;meanwhile,the accumulation was about 25.0,14.5,6.6 mg/L respectively in the periodⅡ.Furthermore,the pH was kept about 5.5-7.5 due to intermittent carbonation mode,which was suitable for the growth of microalgae.Transmembrane pressure(TMP)was only increased by 0.19 and 0.16 bar in the end of periodsⅠandⅡ,respectively.The pure flux recovered to 75%-80%of the original value by only hydraulic cleaning.Scanning electron microscope images also illustrated that carbonation through membrane module could mitigate fouling levels greatly.

关键词： Membrane carbonation SBM-C-PBR Cultivate microalgae Membrane fouling