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双拉盖尔-高斯腔光力系统中的腔内压缩冷却研究

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光学学报 2024年第3期44卷 271-279页

作者：廖庆洪邱海燕程绍平朱泓宇曾永强南昌大学信息工程学院电子信息工程系江西南昌330031

机械振子的冷却是腔光力学研究的重要方向之一。计算光力噪声谱和稳态的最终声子数,对基于耦合光学参量放大器(OPA)的双拉盖尔-高斯腔光力系统中的腔内压缩冷却问题进行研究。在弱耦合条件下,利用微扰近似理论方法得出系统的光力噪声谱... 详细信息

机械振子的冷却是腔光力学研究的重要方向之一。计算光力噪声谱和稳态的最终声子数,对基于耦合光学参量放大器(OPA)的双拉盖尔-高斯腔光力系统中的腔内压缩冷却问题进行研究。在弱耦合条件下,利用微扰近似理论方法得出系统的光力噪声谱,基于费米黄金法则的理论计算出稳态下的最终声子数的解析表达式。利用入射泵浦光驱动腔场内耦合的OPA,使腔场内形成强烈的非线性压缩效应,量子反作用加热过程得到有效抑制,系统净冷却率得到显著提高。此外,讨论了其他系统参数对机械振子冷却的影响。最后研究了系统的稳态声子数,声子数可以在较大参数范围内小于1。该方案能有效地降低机械振子的冷却极限。

关键词：量子光学双拉盖尔-高斯腔基态冷却腔内压缩光力噪声谱

基于内置光纤/导光管反应器的微藻固碳减排研究

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煤炭科学技术 2024年第2期52卷 329-337页

作者：夏奡任柯欣张敬苗黄云朱贤青朱恂廖强重庆大学低品位能源利用技术及系统教育部重点实验室重庆400044 重庆大学工程热物理研究所重庆400044

我国燃煤电厂每年排放CO_(2)超过57亿t,为保障双碳目标如期实现,必须大幅降低燃煤电厂的CO_(2)排放。微藻固碳通过高效的光合作用吸收CO_(2)转化为生物质,是极具潜力的燃煤电厂减碳技术,但目前微藻固碳性能严重受限于反应器内光传输。... 详细信息

我国燃煤电厂每年排放CO_(2)超过57亿t,为保障双碳目标如期实现,必须大幅降低燃煤电厂的CO_(2)排放。微藻固碳通过高效的光合作用吸收CO_(2)转化为生物质,是极具潜力的燃煤电厂减碳技术,但目前微藻固碳性能严重受限于反应器内光传输。导光管可灵活调节反应器内光分布,而光纤可集中传输光线且光损耗低,因此提出光纤/导光管微藻光生物反应器,扩大藻液受光面积,增加藻细胞色素的光捕集,促进微藻光合固碳。利用光学仿真软件对光纤/导光管内传输的光线进行追踪,获得了光纤/导光管管壁的光强分布。在不同反应器、输入光能条件下进行微藻培养实验,获得了微藻生物量、固碳速率与叶绿素含量的变化趋势,分析了内置光纤/导光管对微藻固碳的影响规律。结果表明:平面末端的光纤射出光的光强在导光管侧30~140 mm内迅速下降,导光管发光范围集中。在导光管底部添加锥形反光件反射抵达管底的透射光、并设计阶梯型光纤使输入光由不同阶梯分级发出,可使微藻光生物反应器内光分布更加均匀,反应器内部远离光源区域的藻细胞可以有效接受光能进行光合固碳。当光能输入为3.3 W/L时,含两级阶梯结构光纤和锥形反光件的导光管管侧表面最低光强为47μmol/(m^(2)·s),平均光强达64μmol/(m^(2)·s),较无光纤仅顶部给光的导光管侧面平均光强提高了2.6倍。微藻在插入阶梯型光纤的光生物反应器(SF-PBR)培养7 d后生物量达到1.9 g/L,比在插入平面端光纤的光生物反应器(ff-PBR)中培养的生物量高46.2%,比仅顶部受光的光生物反应器(LG-PBR)中培养的生物量高111.1%。当提升光源输入至5.0 W/L,微藻培养7 d后的生物量高达2.8 g/L,培养期间保持高固碳速率(608.3 mg/(L·d)),比对照组LG-PBR的固碳速率提高1.9倍。

关键词：固碳微藻光生物反应器光纤导光减排

Water’s motions in x–y and z directions of 2D nanochannels:Entirely different but tightly coupled

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Nano Research 2023年第5期16卷 6298-6307页

作者： Shouwei liao Qia Ke Yanying Wei Libo Li Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry&Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

Two-dimensional(2D)material-based membrane separation has attracted increasing attention due to its promising performance compared with traditional membranes.However,in-depth understanding of water transportation behavior in such confined nanochannels is still lacking,which hinders the development of 2D nanosheets membranes.Herein,we investigated water confined in graphene or MoS_(2)nanochannels by molecular dynamics(MD)simulations and found water’s diffusivity always varied linearly with their mean square displacement along z direction(Δz^(2))when system variables(e.g.,water molecules’number,channel height,nonbonded interaction parameter,harmonic potential constraining water’s z-coordinate)changed.Such linear correlation applies to different water models and different force fields(ffs)of channel walls(e.g.,different Lennard–Jones parameters or even flexible ff),no matter whether water molecules form 3-,2-,or quasi-2-layer structure in the nanochannel.This indicates,though water molecules’motion along z direction(z-fluctuation,confined within 1 nm)and that in xy plane(xydiffusion)are entirely different,they are tightly coupled:Violent z-fluctuation would produce more transient void to facilitate xydiffusion,which is to the sharp contrary of bulk water,where motions in x,y,z directions are symmetric,but independent.Our work could help design high performance 2D nanochannels and discover more novel principles in nano-fluidics and membrane separation fields.

关键词： graphene membranes nanochannel nanofluidics water diffusion

Factors affecting selenium-enrichment efficiency,metabolic mechanisms and physiological functions of selenium-enriched lactic acid bacteria

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Journal of Future Foods 2022年第4期2卷 285-293页

作者： Jiajun liao Chenghua Wang College of Light Industry and Food Engineering Guangxi UniversityNanning 530004China

Selenium(Se)-enriched lactic acid bacteria(LAB)are live bacteria preparations that accumulate and bio-transform inorganic Se into organic Se forms including Se-nanoparticles(SeNPs),Se-amino acids and selenoproteins.Se-enriched LAB can play the dual role of organic Se supplement and probiotic effects,and have great applications in the food and biomedical fields.Therefore,more and more attentions have been paid on the Se-enriched LAB.This paper firstly summarized the factors affecting the Se-enrichment efficiency of Se-enriched LAB,then discussed the metabolic mechanisms and physiological functions of Se-enriched LAB,and finally reviewed their applications in food production,in order to provide a guidance for the theoretical and practical implementation of Se-enriched LAB.We concluded that 1)both biomass and the amount of Se enrichment should be used as dual indicators to screen Se-enriched LAB and comprehensively optimize the influencing factors including initial Se concentration,pH,inoculation amount,species of LAB to ensure the Se enrichment efficiency.2)The metabolic mechanism underlining Se-enriched LAB needs to be further revealed,which will facilitate the production of higher value Se compounds by LAB.3)The proven physiological functions of Se-enriched LAB include 5 categories:antioxidant activity,antibacterial activity,improving the physical function of animals,detoxification and disease prevention.However,the application of Se-enriched LAB in medical field currently still lacks clinical research,and convincing clinical evidence of effectiveness for Se-enriched LAB on human being must be established.4)The application in the food field will benefit from the stable existence in the food system of Se-enriched LAB and public acceptance,which come before the various health benefits.In any case,the great potential value of Se-enriched LAB formulations deserves further comprehensive exploration and development.

关键词： SeleniumLactic acid bacteria Physiological functions Selenoprotein Se-nanoparticles(SeNPs)

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膳食炎症指数与老年人肌少症关系的研究

现代预防医学 2024年第8期51卷 1396-1399页

作者：周林桦廖欣怡甄若菀朱琳石磊景小凡四川大学华西医院临床营养科四川大学华西临床医学院四川天府新区正兴社区卫生服务中心

目的探讨膳食炎症指数(Dietary Inflammatory Index, DII)与老年人肌少症的关系，为肌少症的防治提供科学依据。方法选自2022年1月到2023年1月在成都市某社区招募的253名60岁以上老年人作为研究对象。根据半定量食物频率调查表计算DI... 详细信息

目的探讨膳食炎症指数(Dietary Inflammatory Index, DII)与老年人肌少症的关系，为肌少症的防治提供科学依据。方法选自2022年1月到2023年1月在成都市某社区招募的253名60岁以上老年人作为研究对象。根据半定量食物频率调查表计算DII评分，根据DII评分从低到高的四分位数分为Q1～Q4组；根据2019亚洲肌少症工作组(AWGS)共识诊断标准进行肌少症的诊断。通过logistic回归分析探究DII评分与肌少症的关系。结果控制混杂因素后，与Q1组相比，Q3组、Q4组发生肌少症的风险分别是Q1组的3.94倍、7.02倍(P<0.05),随着DII评分增加，老年人发生肌少症的风险增加。结论较高的膳食炎症指数会增加肌少症发生风险，建议对老年人进行膳食指导，降低膳食炎症指数对肌少症发生风险的影响。

关键词：膳食炎症指数肌少症老年人

预防刺参腐皮综合征复方中药的筛选及体内药效评价

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水生生物学报 2024年第7期48卷 1130-1140页

作者：庞明海王春元王印庚李成华廖梅杰张正荣小军李彬刘妮宁波大学海洋学院宁波315211 中国水产科学研究院黄海水产研究所崂山实验室海洋渔业科学与食物产出过程功能实验室青岛266071

为开发防治刺参腐皮综合征的复方中药,从14种中药中筛选出对灿烂弧菌(Vibrio splendidus)有明显抑制作用的单味中药,并通过正交实验确定最佳抗菌复方ff-Z(诃子﹕五倍子﹕穿心莲﹕川芎=15 g﹕2 g﹕10 g﹕5 g)。在饲料中分别添加10、20、3... 详细信息

为开发防治刺参腐皮综合征的复方中药,从14种中药中筛选出对灿烂弧菌(Vibrio splendidus)有明显抑制作用的单味中药,并通过正交实验确定最佳抗菌复方ff-Z(诃子﹕五倍子﹕穿心莲﹕川芎=15 g﹕2 g﹕10 g﹕5 g)。在饲料中分别添加10、20、30和40 g/kg的复方ff-Z作为试验组,不含复方ff-Z的饲料为对照组,并以含恩诺沙星粉20 g/kg的饲料为药物对照组,连续投喂刺参10d,继而用终浓度为10^(7) CFU/mL的灿烂弧菌进行浸浴攻毒,以观察预防保护效果。结果显示,灿烂弧菌对复方ff-Z极敏感,抑菌圈直径可达(23.10±0.62)mm,最小抑菌浓度(MIC)和最小杀菌浓度(MBC)值分别为7.81和15.63 mg/mL;与阴性对照组相比,复方ff-Z各剂量组刺参的SOD、ACP和AKP活性显著提高,且优于药物对照组。在灿烂弧菌感染后,复方ff-Z各剂量组处理的刺参发病时间比阳性对照组推迟2d,其中复方ff-Z 20 g/kg组、ff-Z 30 g/kg组和ff-Z 40 g/kg组刺参的20d发病率分别为22.08%、22.14%和14.58%,显著低于阳性对照组的84.45%。组织病理学观察结果表明,添加30 g/kg复方ff-Z的饲料能够有效减轻灿烂弧菌入侵引起的刺参组织炎症反应,从而起到保护作用。研究证明,复方ff-Z能够显著提高刺参的免疫和抗病力,对灿烂弧菌引起的腐皮综合征具有良好的预防保护效果,能延缓该病的发病进程并降低发病率。

关键词：腐皮综合征灿烂弧菌中药复方恩诺沙星体外抑菌刺参

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商用车传动系统阻力试验分析及应用

汽车零部件 2024年第1期 82-86页

作者：曹辉刘海峰廖善彬蔡利平赵责峻徐东辉江铃汽车股份有限公司新能源新动力院江西南昌330200 南昌师范学院数学与计算机科学系江西南昌330032

针对汽车传动阻力会造成能量损失及影响油耗的问题,以商用车前置后驱车型为对象,利用四驱动力总成台架对汽车5处传动系部件阻力进行试验研究,探索各部件的阻力规律。试验结果表明,驱动桥对传动系阻力影响的占比最大。对比不同型号润滑... 详细信息

针对汽车传动阻力会造成能量损失及影响油耗的问题,以商用车前置后驱车型为对象,利用四驱动力总成台架对汽车5处传动系部件阻力进行试验研究,探索各部件的阻力规律。试验结果表明,驱动桥对传动系阻力影响的占比最大。对比不同型号润滑油和不同油温下的驱动桥阻力发现,驱动桥阻力与润滑油温度的相关性很大。

关键词：前置后驱传动阻力驱动桥润滑油

Magnetic properties and crystallization kinetics of Zn_(0.5) Ni_(0.5) Fe_2O_4

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Rare Metals 2011年第6期30卷 621-626页

作者： WU Wenwei CAI Jinchao WU Xuehang LI Yongni liao Sen School of Chemistry and Chemical Engineering Guangxi University Nanning 530004 P.R. China

Precursor of nanocrystalline Zno.sNio.sFe2O4 was obtained by grinding mixture of ZnSO4.7H2O, NiSO4.6H2O, FeSO4.7H2O, and Na2CO3.10H2O under the condition of suffactant polyethylene glycol （PEG）-400 being present at room temperature, washing the mixture with water to remove soluble inorganic salts and drying it at 373 K. The spinel Zn0.5Ni0.5Fe2O4 was obtained via calcining precursor above 773 K. The precursor and its calcined products were characterized by differential scanning calorimetry （DSC）, Fourier transform infrared （ff-IR）, X-ray diffraction （XRD）, and vibrating sample magnetometer （VSM）. The result showed that Zn0.sNio.sFe204 obtained at 1073 K had a saturation magnetization of 74 A.mLkg-1. Kinetics of the crystallization process of Zn0.5Ni0.5Fe2O4 was studied using DSC technique, and kinetic parameters were determined by Kissinger equation and Moynihan et al. equation. The value of the activation energy associated with the crystallization process of Zr0.5Ni0.5Fe2O4 is 220.89 kJ-mol-1. The average value of the Avrami exponent, n, is equal to 1.59±0.13, which suggests that crystallization process of Zn0.5Ni0.5Fe2O4 is the random nucleation and growth of nuclei reaction.

关键词： magnetic material Zn0.5Ni0.5Fe2O4 non-isothermal kinetics crystallization process solid-state reaction at low heat

Formation of wormlike mi-celles in anionic surfactant AES aqueous solutions

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Chinese Science Bulletin 2001年第16期46卷 1360-1364页

作者： MU Jianhai LI Ganzuo XIAO Hongdi liao Guangzhi LIU Yi HUANG Li LI Boqin Key Laboratory for Colloid and Interface Chemistry of Education Ministry of China Shandong UniversityJi’nan 250100China Research Institute of Exploration&Development Daqing Petroleum Admistrative BureauDaqing 163712China Electric Microscope Laboratory for Basic Medicine Institute Shandong Medical UniversityJi’nan 250012China

The growth and structure of anionic micelles of sodium dodecyl trioxyethylene sulfate (AES) in the presence of multivalent counterion Al3+ were investigated by means of dynamic rheological methods. It has been obtained by themeasurements of shear viscosity, complex viscosity anddynamic moduli, as well as the application of Cox-Merz rule and Cole-Cole plot that wormlike micelle and networkstructure could be formed in AES/AlCl3 aqueous solutions. The structure was of a character of nonlinear viscoelasticfluid and departure from the simple Maxwell model. Thetechnique of freeze-fracture transmission electronmicroscopy (ff-TEM) was also used to confirm theformation of this interesting structure.

关键词： wormlike micelle rheology ff-TEM sodiumdodecyltrioxyethylene sulfate.