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微藻两阶段培养技术研究进展

微生物学通报 2024年第1期51卷 1-16页

作者：吴朋徽刘耀张磊肖芃颖张玥重庆理工大学化学化工学院重庆400054

微藻细胞富含油脂、淀粉及其他高值代谢物,可用于食品、饲料、化学品和能源的生产。但在规模化培养中,微藻的高生长速率和高产物含量难以兼得,制约了其商业化应用。通过微藻的两阶段培养技术可以将生长和产物积累的时期分离,从而同时获... 详细信息

微藻细胞富含油脂、淀粉及其他高值代谢物,可用于食品、饲料、化学品和能源的生产。但在规模化培养中,微藻的高生长速率和高产物含量难以兼得,制约了其商业化应用。通过微藻的两阶段培养技术可以将生长和产物积累的时期分离,从而同时获得较高的微藻生物量和产物含量。该技术具有产品得率高、节能减排、适用范围广的优点,是推进微藻商业化的关键之一。本综述总结了现有微藻两阶段培养技术的优势和产品类型,解析了目前微藻两阶段培养技术的限制因素及发展前景,并提出微藻两阶段培养中存在阶段转换时间尚不明确、中间采收步骤成本高这两个限制该技术应用的关键瓶颈,从而为未来微藻两阶段培养技术规模化生产方案的科学决策与实施提供参考。

关键词：微藻两阶段培养油脂淀粉氢气虾青素

Power spectral density analysis for nonlinear systems based on Volterra series

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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1743-1758页

作者： penghui wu Yan ZHAO Xianghong XU State Key Laboratory of Structural Analysis for Industrial Equipment Faculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116023Liaoning ProvinceChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China

A consequence of nonlinearities is a multi-harmonic response via a monoharmonic excitation.A similar phenomenon also exists in random *** power spectral density(PSD)analysis of random vibration for nonlinear systems is studied in this *** analytical formulation of output PSD subject to the zero-mean Gaussian random load is deduced by using the Volterra series expansion and the conception of generalized frequency response function(GFRF).For a class of nonlinear systems,the growing exponential method is used to determine the first 3 rd-order *** proposed approach is used to achieve the nonlinear system’s output PSD under a narrow-band stationary random *** relationship between the peak of PSD and the parameters of the nonlinear system is *** using the proposed method,the nonlinear characteristics of multi-band output via single-band input can be well *** results reveal that changing nonlinear system parameters gives a one-of-a-kind change of the system’s output *** paper provides a method for the research of random vibration prediction and control in real-world nonlinear systems.

关键词： Volterra series nonlinear system generalized frequency response function(GFRF) power spectrum density(PSD)

超高强带钢冷轧及平整过程表面粗糙度协同控制工艺

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钢铁 2024年第3期59卷 129-136页

作者：王立萍周新福吴朋徽张冀李学通辽宁科技大学机械工程与自动化学院辽宁鞍山114051 燕山大学国家冷轧板带装备及工艺工程技术研究中心河北秦皇岛066004 燕山大学亚稳材料制备技术与科学国家重点实验室河北秦皇岛066004

超高强带钢强度高、硬度大、平整轧制过程中伸长率小,因此工作辊压印能力弱,即轧辊粗糙度压印率较小而带钢表面粗糙度遗传率大,同时来料带钢表面粗糙度没有得到精准控制,最终导致成品带钢表面粗糙度难以达标。首先,充分考虑超高强带钢... 详细信息

超高强带钢强度高、硬度大、平整轧制过程中伸长率小,因此工作辊压印能力弱,即轧辊粗糙度压印率较小而带钢表面粗糙度遗传率大,同时来料带钢表面粗糙度没有得到精准控制,最终导致成品带钢表面粗糙度难以达标。首先,充分考虑超高强带钢的冷轧及平整轧制特点,分析了带钢伸长率、工作辊表面粗糙度及来料表面粗糙度对超高强带钢表面粗糙度的影响。其次,提出超高强带钢冷轧机组与平整机组轧制过程表面粗糙度协同控制策略,通过设定冷轧机组第4机架与第5机架工作辊表面粗糙度完成对平整来料表面粗糙度的控制,进一步设定平整机组工作辊表面粗糙度范围,通过调整带钢伸长率的大小,建立以超高强带钢成品表面粗糙度控制精度为目标的冷轧及平整机组协同控制技术模型。最后,将控制技术应用到国内某冷轧与平整机组4种典型规格的超高强带钢实际生产过程中。工艺结果表明,平整机组来料表面粗糙度与控制标准的偏差降低了0.1μm,满足平整机组对来料表面粗糙度的要求,同时,成品带钢表面粗糙度控制精度达到了90%以上,粗糙度波动值降到0.06μm以下,有效地提升了平整机组对超高强带钢表面粗糙度的控制能力,具有进一步推广应用的价值。

关键词：超高强钢冷连轧机组平整机组工作辊表面粗糙度协同控制

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中华儿科杂志 2024年第1期62卷 55-59页

作者：张慧珊常旭婷吴鹏辉宋丹羽格根丁玮胡展维王广发姜玉武叶乐平北京大学第一医院儿科北京100034 北京大学第一医院呼吸和危重症医学科北京100034

目的探讨新型冠状病毒Omicron变异株感染相关的儿童多系统炎症综合征(MIS-C)的临床特征、诊治及随访情况。方法回顾性病例总结。分析2022年12月至2023年1月北京大学第一医院儿科收治的11例MIS-C的临床资料。对MIS-C的临床特点、治疗和... 详细信息

目的探讨新型冠状病毒Omicron变异株感染相关的儿童多系统炎症综合征(MIS-C)的临床特征、诊治及随访情况。方法回顾性病例总结。分析2022年12月至2023年1月北京大学第一医院儿科收治的11例MIS-C的临床资料。对MIS-C的临床特点、治疗和随访进行总结。结果11例患儿中男7例、女4例,就诊年龄4.4(2.0,5.5)岁。所有患儿均有发热,持续时间7(5,9)d。皮疹7例、球结膜充血5例、口唇红和杨梅舌3例、淋巴结肿大3例、手足硬肿2例。出现消化道症状8例、呼吸系统症状8例,神经系统症状3例。8例患儿存在多系统损伤,其中1例有休克症状。11例患儿均为新型冠状病毒Omicron(BF.7)变异株感染,实验室检查结果示11例均有炎症指标升高、凝血功能异常和心肌损伤,6例白细胞计数升高,5例肝功能损伤,3例肾功能损伤,8例冠状动脉病变。11例患儿均接受抗感染治疗,其中8例接受2 g/kg静脉注射人免疫球蛋白和2 mg/(kg·d)甲泼尼龙治疗,3例仅接受2 g/kg静脉注射人免疫球蛋白治疗。8例冠状动脉病变患儿中6例接受低分子肝素抗凝治疗。所有患儿出院后2周随访其炎症指标均基本恢复正常,4周后复查冠状动脉病变8例和肺炎3例均较前明显好转或恢复正常。所有患儿随访3个月以上均无新增并发症或合并症。结论MIS-C可表现为类川崎病样症状,伴或不伴消化系统、神经系统或呼吸系统症状,炎症指标升高、凝血功能异常和心脏损伤有助于MIS-C诊断。静脉注射人免疫球蛋白和甲泼尼龙为治疗MIS-C首选药物,随访3个月以上短期预后均良好。

关键词：儿童多系统炎症综合征 Omicron变异株治疗随访

桥面连续结构分离长度对组合梁整体受力特性的影响

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结构工程师 2024年第3期40卷 29-38页

作者：万先军林昱陶宣斌刘安吴鹏辉苏庆田江西省交通投资集团有限责任公司南昌330025 中交公路规划设计院有限公司北京100120 同济大学桥梁工程系上海200092

为了明确组合梁中支点处钢梁与混凝土桥面板分离对大跨度恒载组合梁桥受力性能的影响,结合一实际工程,采用板壳-实体有限元方法,分析了中支点处桥面板与钢梁分离及完全结合情况下组合梁受力性能的区别,以及分离段长度变化对整体结构和... 详细信息

为了明确组合梁中支点处钢梁与混凝土桥面板分离对大跨度恒载组合梁桥受力性能的影响,结合一实际工程,采用板壳-实体有限元方法,分析了中支点处桥面板与钢梁分离及完全结合情况下组合梁受力性能的区别,以及分离段长度变化对整体结构和中支点附近板件受力的影响。研究结果表明:在中支点附近一定范围设立分离段对组合梁整体刚度影响较小,但能减弱该处钢-混间连接刚度,有效减小中支点处混凝土上表面拉应力,进而减缓该处混凝土的开裂问题。对于60 m跨的组合梁,支点处钢-混分离段长度宜设为单跨跨径的11%左右。

关键词：桥梁工程组合结构桥面连续连接件受力性能合理范围

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分蘖洋葱伴生对番茄果实品质及根际土壤养分的影响

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中国农学通报 2024年第19期40卷 33-39页

作者：吴鹏辉孔令捷郎一山赵海蒙周浩楠姜浩楠吴瑕黑龙江八一农垦大学园艺园林学院黑龙江大庆163319

为探究分蘖洋葱伴生对番茄果实品质和土壤养分的影响,以‘东农708’番茄为试验材料,采用盆栽试验方式,设置单作番茄和分蘖洋葱伴生番茄2个处理。在播种后20、30、40、100d时进行根际土壤取样。在果实成熟后对番茄的第一穗果和第二穗果... 详细信息

为探究分蘖洋葱伴生对番茄果实品质和土壤养分的影响,以‘东农708’番茄为试验材料,采用盆栽试验方式,设置单作番茄和分蘖洋葱伴生番茄2个处理。在播种后20、30、40、100d时进行根际土壤取样。在果实成熟后对番茄的第一穗果和第二穗果的品质进行分析。结果显示,分蘖洋葱的伴生番茄果实中维生素C、可溶性糖、糖酸比、可溶性蛋白、番茄红素含量显著高于单作番茄,番茄果实的可滴定酸含量显著低于单作番茄,并且第一穗果营养品质好于第二穗果,而第二穗果口感品质好于第一穗果。分蘖洋葱伴生番茄的根际土pH、EC、速效磷、速效钾、碱解氮、有机质含量都显著高于单作处理,而硝态氮、铵态氮含量显著低于单作处理。综上,分蘖洋葱伴生可增加土壤养分的活性,促进番茄的养分吸收,为番茄生长提供了充足的养分基础,从而改善番茄品质。

关键词：番茄分蘖洋葱伴生果实品质土壤养分

Electrospinning-hot pressing technique for the fabrication of thermal and electrical storage membranes and its applications

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 1945-1964页

作者： Panpan Che Baoshan Xie penghui Cao Youfu Lv Daifei Liu Huali Zhu Xianwen wu Zhangxing He Jian Chen Chuanchang Li Key Laboratory of Renewable Energy Electric-Technology of Hunan Province School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Disaster Prevention&Reduction for Power Grid Changsha University of Science and TechnologyChangsha 410114China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China

The combination of electrospinning and hot pressing,namely the electrospinning-hot pressing technique(EHPT),is an efficient and convenient method for preparing nanofibrous composite materials with good energy storage *** emerging composite membrane prepared by EHPT,which exhibits the advantages of large surface area,controllable morphology,and compact structure,has attracted immense *** this paper,the conduction mechanism of composite membranes in thermal and electrical energy storage and the performance enhancement method based on the fabrication process of EHPT are systematically ***,the state-of-the-art applications of composite membranes in these two fields are *** particular,in the field of thermal energy storage,EHPT-prepared membranes have longitudinal and transverse nanofibers,which generate unique thermal conductivity pathways;also,these nanofibers offer enough space for the filling of functional ***,EHPT-prepared membranes are beneficial in thermal management systems,building energy conservation,and electrical energy storage,e.g.,improving the electrochemical properties of the separators as well as their mechanical and thermal *** application of electrospinning-hot pressing membranes on capacitors,lithium-ion batteries(LIBs),fuel cells,sodium-ion batteries(SIBs),and hydrogen bromine flow batteries(HBFBs)still requires *** the future,EHPT is expected to make the field more exciting through its own technological breakthroughs or be combined with other technologies to produce intelligent materials.

关键词： electrospinning-hot pressing technique thermal storage electrical storage composite membranes nanofiber

Impaired Spatial Firing Representations of Neurons in the Medial Entorhinal Cortex of the Epileptic Rat Using Microelectrode Arrays

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Research 2024年第2期2023卷 541-552页

作者： Zhaojie Xu Fan Mo Gucheng Yang penghui Fan Botao Lu Wei Liang Fanli Kong Luyi Jing Wei Xu Juntao Liu Mixia Wang Yirong wu Xinxia Cai State Key Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Epilepsy severely impairs the cognitive behavior of *** remains unclear whether epilepsy-induced cognitive impairment is associated with neuronal activities in the medial entorhinal cortex(MEC),a region known for its involvement in spatial *** explore this neural mechanism,we recorded the spikes and local field potentials from MEC neurons in lithium-pilocarpine-induced epileptic rats using self-designed microelectrode *** the open field test,we identified spatial cells exhibiting spatially selective firing properties and assessed their spatial representations in relation to the progression of ***,we analyzed theta oscillations and theta modulation in both excitatory and inhibitory ***,we used a novel object recognition test to evaluate changes in spatial cognitive ability of epileptic *** the epilepsy modeling,the spatial tuning of various types of spatial cells had suffered a rapid and pronounced damage during the latent period(1 to 5 d).Subsequently,the firing characteristics and theta oscillations were *** the chronic period(>10 d),the performance in the novel object experiment *** conclusion,our study demonstrates the detrimental effect on spatial representations and electrophysiological properties of MEC neurons in the epileptic latency,suggesting the potential use of these changes as a"functional biomarker"for predicting cognitive impairment caused by epilepsy.

关键词： epilepsy impaired involvement

Conducting Polymer-Based e-Refinery for Sustainable Hydrogen Peroxide Production

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Energy & Environmental Materials 2024年第2期7卷 334-342页

作者： Zhixing wu penghui Ding Viktor Gueskine Robert Boyd Eric Daniel G■owacki Magnus Odén Xaνier Crispin Magnus Berggren Emma M.Björk Mikhail Vagin Nanostructured Materials Department of PhysicsChemistry and Biology(IFM)Linköping UniversitySE 58183LinköpingSweden Laboratory of Organic Electronics Department of Science and Technology(ITN)Linköping UniversitySE 60174NorrköpingSweden

Electrocatalysis enables the industrial transition to sustainable production of chemicals using abundant precursors and electricity from renewable ***-centralized production of hydrogen peroxide(H_(2)O_(2))from water and oxygen of air is highly desirable for daily life and *** report an effective electrochemical refinery(e-refinery)for H_(2)O_(2)by means of electrocatalysis-controlled comproportionation reaction(2_(H)O+o→2HO),feeding pure water and oxygen *** nickel(Ⅱ)oxide(NiO)was used as electrocatalyst for oxygen evolution reaction(OER),producing oxygen at the *** polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)drove the oxygen reduction reaction(ORR),forming H_(2)O_(2)on the *** reactions were evaluated in both half-cell and device *** performance of the H_(2)O_(2)e-refinery,assembled on anion-exchange solid electrolyte and fed with pure water,was limited by the unbalanced ionic *** of the operation conditions allowed a conversion efficiency of 80%.

关键词： conducting polymer hydrogen peroxide nickel(Ⅱ)oxide oxygen evolution reaction oxygen reduction reaction