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应用于烘焙产品的咖啡麦芽预拌粉储藏期内的品质变化研究

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粮油食品科技 2024年第1期32卷 105-112页

作者：姚倩儒于忠钊张德鹏张一杜昱蒙李慧杨海莺杜以俊中粮营养健康研究院老年营养食品研究北京市工程实验室营养健康与食品安全北京市重点实验室北京102209 中粮麦芽(大连)有限公司辽宁大连116200

为研究咖啡麦芽预拌粉随着储藏期延长的品质变化规律,将咖啡麦芽预拌粉分别储存于25℃和35℃、相对湿度为50%的环境中,对其整个储藏期内水分、脂肪酸值、降落数值进行监测;采用固相微萃取法结合气相色谱-质谱法对其储藏期内挥发性化合... 详细信息

为研究咖啡麦芽预拌粉随着储藏期延长的品质变化规律,将咖啡麦芽预拌粉分别储存于25℃和35℃、相对湿度为50%的环境中,对其整个储藏期内水分、脂肪酸值、降落数值进行监测;采用固相微萃取法结合气相色谱-质谱法对其储藏期内挥发性化合物进行分析。结果表明,随着储藏期的延长,水分整体呈下降趋势,脂肪酸值和降落数值总体呈上升趋势,且储藏温度越高,变化越明显;分析出咖啡麦芽预拌粉主要挥发性化合物41种,主要包括醛类13种、杂环类15种、酯类7种、醇类4种、酮类2种,其中,醛类物质(正己醛、壬醛、反式-2-壬烯醛)的相对浓度随储藏期的延长有增加趋势。

关键词：咖啡麦芽预拌粉品质变化挥发性化合物

一种应用于卫星中红外遥感的辐射传输简化计算方案

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红外与毫米波学报 2024年第3期43卷 375-390页

作者：姚前许华樊程李莉王思恒郑杨徐文斌侯伟真徐敬海庄齐枫周鹏张灏陈震霆李正强中国科学院空天信息创新研究院国家环境保护卫星遥感重点实验室北京100101 中国科学院大学北京100049 中国空间技术研究院遥感卫星总体部北京100094 北京环境特性研究所光学辐射重点实验室北京100854 南京工业大学测绘科学与技术学院江苏南京211816 昆明学院信息技术学院云南昆明650214

作为可见光-近红外和热红外的连接谱段,中红外(MIR)兼具短波辐射的反射特性和长波辐射的发射特性,对于温度探测、目标识别等应用场景有十分重要的意义。目前,MIR谱段辐射传输(RT)计算仍然面临背景参数输入多且不易获取的问题。基于此,... 详细信息

作为可见光-近红外和热红外的连接谱段,中红外(MIR)兼具短波辐射的反射特性和长波辐射的发射特性,对于温度探测、目标识别等应用场景有十分重要的意义。目前,MIR谱段辐射传输(RT)计算仍然面临背景参数输入多且不易获取的问题。基于此,提出了一种应用于卫星MIR遥感的RT简化计算方案。使用MODTRAN模型(MM),对MIR白天RT过程中所涉及的背景地表和大气参数定量模拟分析,得到影响RT的关键参数,据此形成一套基于MM的参数简化方案(SS)。在MODIS 6个MIR通道的中心波长处,对SS和MM计算的总辐亮度做对比验证,RMSE均小于0.004399,具有较高精度。SS仅依赖于表面温度、表面发射率、大气廓线类型、水汽和云光学厚度,不需要输入气溶胶、CO_(2)和O_(3)数据。相比MM,SS将输入参数从8类降低到5类,计算的时间效率提升了9.02%。在有限的计算资源下,本文所提的SS能够为MIR图像快速处理、大场景遥感仿真等应用领域提供支撑。

关键词：中红外(MIR)谱段辐射传输(RT)计算背景参数简化方案(SS)

茂兰保护区华南五针松群落乔木层主要物种的种间亲和性

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内蒙古林业调查设计 2024年第1期47卷 87-91+44页

作者：柳华富智扬坤姚芊陈正仁王登鸿贵州茂兰国家级自然保护区管理局贵州华旭林业勘察设计有限公司

基于茂兰保护区华南五针松群落调查数据，采用重要值、物种联结指数、Spearman秩相关系数、生态位宽度和生态位重叠等指标，探明了15个主要树种的种间联结性、相互关系及生态位。结果表明：(1)群落总体呈不显著正联结，物种间的相互作... 详细信息

基于茂兰保护区华南五针松群落调查数据，采用重要值、物种联结指数、Spearman秩相关系数、生态位宽度和生态位重叠等指标，探明了15个主要树种的种间联结性、相互关系及生态位。结果表明：(1)群落总体呈不显著正联结，物种间的相互作用竞争不强烈，形成的种间搭配关系对资源的利用较好；(2)主要物种重要值和生态位宽度值排前5的分别为：华南五针松、化香、乌冈栎、荔波鹅耳枥和青冈栎，在群落中个体数量较多，具有相似的生态习性和资源需求，既是乔木层的优势种和重要种，也是群落演替的主导树种，优势种间具有较高的生态位重叠，存在着激烈的竞争；(3)Spearman秩相关系数显示的105种对中，显示正相关的有66对，负相关有39对，比值为1.692，种间相关性较为松散，各种群趋向于独立分布，有较大的随机性。

关键词：华南五针松总体联结种间相关性生态位群落

Arabidopsis Transcription Factors SPL1 and SPL12 Confer Plant Thermotolerance at Reproductive Stage

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Molecular Plant 2017年第5期10卷 735-748页

作者： Lu-Men Chao yao-qian Liu Dian-Yang Chen Xue-Yi Xue Ying-Bo Mao Xiao-Ya Chen National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences Shanghai Institute of Plant Physiology and Ecology University of CAS Chinese Academy of Sciences Shanghai 200032 People's Republic of China School of Life Science and Technology ShanghaiTech University Shanghai 201210 People's Republic of China plant Science Research Center Shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical Garden Shanghai 201602 People's Republic of China These authors contribute equally to this article

Plant reproductive organs are vulnerable to heat, but regulation of heat-shock responses in inflorescence is largely uncharacterized. Here, we report that two of the SQUAMOSA PROMOTER BINDING PROTEIN- LIKE （SPL） transcriptional factors in Arabidopsis, SPL1 and SPL12, act redundantly in thermotolerance at the reproductive stage. The spll-1 sp112-1 inflorescences displayed hypersensitivity to heat stress, whereas overexpression of SPL 1 or SPL 12 enhanced the thermotolerance in both Arabidopsis and tobacco. RNA sequencing revealed 1939 upregulated and 1479 downregulated genes in wild-type inflorescence upon heat stress, among which one-quarter （1,040） was misregulated in spll-1 sp112-1, indicating that SPL1 and SPL12 contribute greatly to the heat-triggered transcriptional reprogramming in inflorescence. Notably, heat stress induced a large number of abscisic acid （ABA） responsive genes, of which -39% were disturbed in heat induction in spll-1 sp112-1 inflorescence. Preapplication of ABA and overex- pression of SPL1 restored the inflorescence thermotolerance in spll-1 sp112-1 and in the ABA biosynthesis mutant aba2-1, but not in the pyl sextuple mutant defective in ABA receptors PYR 1/PYL 1/PYL2/PYL4/PYL5/ PYL8. Thus, inflorescence thermotolerance conferred by SPL1 and SPL2 involves PYL-mediated ABA signaling. The molecular network consisting of SPL1 and SPL12 illustrated here shed new light on the mechanisms of plant thermotolerance at the reproductive stage.

关键词： plant thermotolerance inflorescence SPL transcription factor abscisic acid

An investigation on topologies of hybrid manifold,impinging-jet nozzle and micro-pin-fin heat sinks

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Science China(Technological Sciences) 2024年第4期67卷 1061-1076页

作者： SHI qianLei yao XiaoLe LIU qian QIN Le JU Xing XU Chao Key Laboratory of Power Station Energy Transfer Conversion and System of MOE North China Electric Power UniversityBeijing 102206China

The hybrid manifold micro-pin-fin(MMPF)heat sink combined nozzle jets is an option for large-scale integrated circuits(LSI).The demond for uniform and ultra-high heat flux removal by MMPF heat sink has not been adequately *** work aims to solve the problem of fluid *** proposed basic tiling topologies,including square,regular hexagon,30°rhombus,and 60°rhombus topologies,provide different organized fluid flows and heat transfer *** present study focuses on comparing these topologies according to independent porous medium parameters,such as nozzle pore size D_(Z),flow pore size D_(X,Y),and porosityε.The results show that the square topology achieves the smallest total thermal resistance R_(tot)value of0.0975×10^(-4)K m^2/W,while the hexagon topology achieved the highest value of COP/?T,which was 2033.9 K^(-1).According to the sensitivity analysis results,the optimal total thermal resistance can be obtained by balancing the influences of nozzle pore size,flow pore size,and *** optimal pressure drop can be obtained by maximizing the porosity.

关键词： heat sink ultra-high heat flux manifold micro-pin-fin impinging-jet topology

Wind Turbine Gearbox Fault Diagnosis Based on Multi-sensor Signals Fusion

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Protection and Control of Modern Power Systems 2024年第4期9卷 96-109页

作者： yao Zhao Ziyu Song Dongdong Li Rongrong qian Shunfu Lin the College of Electrical Engineering Shanghai University of Electric PowerShanghai 200090China IEEE the Design Research and Development Center AECC Commercial Aircraft Engine Co. Ltd.Shanghai 200241China

This paper proposes a novel fault diagnosis method by fusing the information from multi-sensor signals to improve the reliability of the conventional vibration-based wind turbine drivetrain gearbox fault diagnosis *** method fully extracts fault features for variable speed,insufficient samples,and strong noise scenarios that may occur in the actual operation of a wind turbine planetary ***,multiple sensor signals are added to the diagnostic model,and multiple stacked denoising auto-encoders are designed and improved to extract the fault ***,a cycle reservoir with regular jumps is introduced to fuse multidimensional fault information and output diagnostic results in response to the insufficient ability to process fused information by the conventional Softmax *** addition,the competitive swarm optimizer algorithm is introduced to address the challenge of obtaining the optimal combination of parameters in the ***,the validation results show that the proposed method can increase fault diagnostic accuracy and improve robustness.

关键词： Wind turbine gearbox fault diagnosis multiple scenarios deep learning stacked denoising au-to-encoder cycle reservoir with regular jumps feature fusion network

Mechanism and application of mechanical property improvements in engineering materials by pulsed magnetic treatment:A review

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Friction 2024年第10期12卷 2139-2166页

作者： Zhipeng CAI Chengkai qian Xu ZHANG Ning DAI yao WU Wen JI State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Tianjin Research Institute for Advanced Equipment Tsinghua UniversityTianjin 300304China

Pulsed magnetic treatment(PMT)has been adopted as an effective strengthening method for engineering materials and components in recent years,and the development of its application depends on the comprehensive understanding of the nature of *** deep mechanism was thought initially to be the magnetostrictive effect,while further investigation found that the magnetic field could lead to the change of the defect states in the crystal,which is called the magnetoplastic *** to the complexity of the engineering materials,manifestations of the magnetoplastic effect become more diverse,and they were reviewed in the form of microstructure homogenization and interfacial ***,the mechanism of the magnetoplastic effect was discussed,focusing on the changes in the spin states under the external magnetic *** modifications could also alter material performances,especially the residual stress,plasticity,and fatigue ***,PMT with specific parameters can be utilized to obtain an ideal combination of microstructure,residual stress,and mechanical properties for better service performance of different mechanical parts,and its applications on machining tools and bearings are perfect *** work reviews the effect of PMT on the microstructure and properties of different materials and the mechanism,and it also summarizes the fundamental applications of PMT on essential mechanical parts.

关键词： pulsed magnetic treatment wear resistance microstructure modifications mechanical properties magnetoplastic effect

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工业污染现状分析及防治方法研究

广州化工 2024年第1期52卷 24-26页

作者：周晴唐宇陈耀千杨晓雨许定达内江师范学院化学化工学院四川内江641100

近年来随着我国经济的不断发展,工业也随之迅速发展,工业污染问题日益严重,由此对生态环境造成了恶劣的影响,资源浪费和环境污染是我国目前面临的较为突出的问题。为了正确地解决我国工业污染问题,实现工业发展与环境保护相互协调,促进... 详细信息

近年来随着我国经济的不断发展,工业也随之迅速发展,工业污染问题日益严重,由此对生态环境造成了恶劣的影响,资源浪费和环境污染是我国目前面临的较为突出的问题。为了正确地解决我国工业污染问题,实现工业发展与环境保护相互协调,促进我国经济与社会的可持续发展,我们既要认真分析当前工业环境污染的现状,也要采取切实有效的工业污染防治措施,在发展经济的同时,不断地进行环境治理,努力营造更加和谐、清洁的生活环境。

关键词：工业污染环境保护防治措施清洁生产

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人工影响天气国际标准化发展趋势研究

标准科学 2024年第6期 24-29页

作者：钱尧郭小雨贺星瑶刘春卉杜春丽赵俊杰谢正帅中国气象局人工影响天气中心中北大学中国标准化研究院山西省气象灾害防御技术中心河南省人工影响天气中心

为填补我国人工影响天气标准国际化工作的空白,提升我国在国际标准体系中的地位和影响力,以及增强我国人工影响天气标准在国际社会的认可度,本文对世界气象组织和国际标准化组织的发展现状进行了深入研究,并对气象领域的标准化现状进行... 详细信息

为填补我国人工影响天气标准国际化工作的空白,提升我国在国际标准体系中的地位和影响力,以及增强我国人工影响天气标准在国际社会的认可度,本文对世界气象组织和国际标准化组织的发展现状进行了深入研究,并对气象领域的标准化现状进行了详细分析。基于国外以及我国已制定的人工影响天气标准情况,提出推动我国人工影响天气领域标准国际化工作的具体路径和方法,旨在为人工影响天气领域的国际标准“本地化”和本地标准“国际化”提供有力的技术支撑。

关键词：人工影响天气国际标准化气象

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