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Detection and assessment of nitrogen effect on cold tolerance for tea by hyperspectral reflectance with PLSR, PCR, and LM models

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Information Processing in Agriculture 2021年第1期8卷 96-104页

作者： eric Amoah Asante Zhe Du Yongzong Lu Yongguang hu School of Agricultural Equipment Engineering Institute of Agricultural EngineeringJiangsu UniversityZhenjiangJiangsu 212013China Department of Mechanical Engineering Faculty of EngineeringKoforidua Technical UniversityKoforiduaGhana

Knowledge of nutrients effect on freezing tolerance is vital for protecting tea plants against cold injury(CI).Freezing injury treatments on tea leaves with different low temperature and nitrogen(N)concentration was evaluated by hyperspectral imaging based on the reflectance as potential analytical ***,quantitative evaluation of the CI was improved by comparing analyzed results using partial least squares regression(PLSR),principle component regression(PCR)and linear model(LM)*** of the CI was obtained by hyperspectral imaging system in the band between 871 and 1766 *** results showed that average reflectance increases with the rise of N concentration.A substantial portion of the leaf from the plant with 100%N dosage had the darkest image and resulted in the highest reflectance because the N weakened the negative effect of freezing *** of the five spectral domains tested,the best predictive accuracy for the CI of the tea leaf was achieved by PCR(R^(2)=0.9971,RMSE=0.0609)in 1410–1766 nm wavelength,followed by LM(R^(2)=0.9999,RMSE=0.0805)in 871–1000 *** whole interval had the worse prediction accuracy which could be caused by large variations in the data for a specific treatment and high absorption peak occurring around 1450 nm in the reflectance *** averages,R^(2) and RMSE for all the three statistical models showed that the worse prediction accuracy occurred in 1410–1766 nm,followed by the whole interval 871–1766 *** prediction accuracy was low which could be due to the strong water absorption peaks that appeared in both range of *** models without absorption bands had improved correlation coefficient and reduced RMSE values between the measured and the predicted CI(R^(2)=0.9676;RMSE=0.3067)compared to the model developed with the reflectance values in the entire waveband(R^(2)=0.9504;RMSE=0.6629).The reflectance values where absorption bands occurred had detrimental effect on the model performance,which

关键词： Cold injury Hyperspectral imaging Reflectance Principal component

Vibration control of fluid-conveying pipes: a state-of-the-art review

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1423-1456页

作者： hu DING j.C.jI Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Shaoxing Institute of Technology Shanghai UniversityShaoxing 312074Zhejiang ProvinceChina Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China School of Mechanical and Mechatronic Engineering University of Technology SydneyNew South Wales 2007Australia

Fluid-conveying pipes are widely used to transfer bulk fluids from one point to another in many engineering *** are subject to various excitations from the conveying fluids,the supporting structures,and the working environment,and thus are prone to vibrations such as flow-induced vibrations and acoustic-induced *** can generate variable dynamic stress and large deformation on fluid-conveying pipes,leading to vibration-induced fatigue and damage on the pipes,or even leading to failure of the entire piping system and catastrophic ***,the vibration control of fluid-conveying pipes is essential to ensure the integrity and safety of pipeline systems,and has attracted considerable attention from both researchers and *** present paper aims to provide an extensive review of the state-of-the-art research on the vibration control of fluid-conveying *** vibration analysis of fluid-conveying pipes is briefly discussed to show some key issues involved in the vibration ***,the research progress on the vibration control of fluid-conveying pipes is reviewed from four aspects in terms of passive control,active vibration control,semi-active vibration control,and structural optimization design for vibration ***,the main results of existing research on the vibration control of fluid-conveying pipes are summarized,and future promising research directions are recommended to address the current research *** paper contributes to the understanding of vibration control of fluid-conveying pipes,and will help the research work on the vibration control of fluidconveying pipes attract more attention.

关键词： fuid-conveying pipe vibration passive control nonlinear energy sink(NES) active control semi-active control

语音情感识别在联合收割机疲劳驾驶预警中的研究——基于汉语语言音韵

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农机化研究 2025年第3期47卷 202-206页

作者：胡士强罗杨红河学院云南红河661100 宜宾学院四川宜宾644000

通过汉语语言音韵的语音情感识别实现联合收割机疲劳驾驶检测具有非侵入性、高效准确、实时性强、可普及性强和应用场景广泛等优点。因此,为了提高疲劳驾驶准确识别率,将梅尔频率倒谱系数和汉语语言音韵融合在一起,利用高斯混合模型和... 详细信息

通过汉语语言音韵的语音情感识别实现联合收割机疲劳驾驶检测具有非侵入性、高效准确、实时性强、可普及性强和应用场景广泛等优点。因此,为了提高疲劳驾驶准确识别率,将梅尔频率倒谱系数和汉语语言音韵融合在一起,利用高斯混合模型和极限学习机作为分类器进行语音疲劳检测。检测结果表明:该方法疲劳识别率很高,平均正确识别率达到了93.17%,具有较高的实用价值和推广价值。

关键词：汉语语言音韵情感识别联合收割机疲劳驾驶

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Addition of polyfluoropolyhaloethanes to alkenes

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Chinese journal of Chemistry 1995年第3期13卷 273-279页

作者： CHEN, j.hu, CM CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

In the presence of CrCl3/Fe redox system, polyfluoropolyhaloethanes readily added to electron-deficient or electron-rich alkenes, giving the corresponding 1:1 hydropolyfluoroalkylation product or 1:1 adduct in high yields. This reaction provided a simple and convenient method to synthesize building blocks containing a CF3 or CF2 moiety.

关键词： CRCL3/FE REDOX SYSTEM POLYFLUOROPOLYHALOETHANE ALKENE ADDITION ADDUCT

Direct synthesis of per(poly)fluoroalkylmethyl-substituted electrophilic cyclopropane derivatives

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Chinese journal of Chemistry 1995年第4期13卷 368-379页

作者： CHEN, j.hu, CM CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

A convenient and direct per(poly)fluoroalkylmethyl-introducing cyclopropanation reaction was described. In the presence of CrCl3/Fe, per(poly)fluoroalkyl iodides reacted with diethyl allylmalonate and its analogs to give per(poly)fluoroalkylmethyl-substituted electrophilic cyclopropane derivatives in high yields. This reaction was considered to proceed by two steps: radical addition followed by cyclopropanation.

关键词： FLUOROALKYL IODIDE DIETHYL ALLYLMALONATE CRCL3/FE REDOX SYSTEM ADDITION CYCLOPROPANATION

Evaluation of solar aided biomass power generation systems with parabolic trough field

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Science China(Technological Sciences) 2011年第6期54卷 1455-1461页

作者： HOU Hongjuan YANG YongPing hu eric SONG jiFeng DONG ChangQing MAO jian Beijing Key Laboratory of Safe and Clean Energy Technology North China Electric Power University Beijing 102206 China National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power University Beijing 102206 China School of Mechanical Engineering The University of Adelaide SA 5005 Australia

Solar and biomass are both renewable energy *** biomass as fuel is becoming more and more attractive after governments increase the tariff for the electricity from the renewable *** the costs of power from a biomass power generation plant depend greatly on the availability and quality of the biomass *** commercialization of solar alone thermal power generation is hindered by its high initial investment and low thermal *** this paper,a concept of integrating solar into a biomass power generation system is put *** the system the oil heated by a parabolic trough solar field is used to replace the extraction steam to preheat the feed water(entering a biomass boiler) and the previous extraction steam thus saved can continue to do work in the lower stages of *** performance of the hybrid system with different replacements is analyzed and compared through two typical solar aided biomass generating *** results show that the integration not only reduces the consumption of biomass fuel(at the same generation capacity) but is also proved to be an efficient way to convert solar thermal energy into *** results also show that with the same solar aperture area,the higher the grade of the replaced extraction steam,the better the thermal performance and economy.

关键词： solar thermal power biomass power aided

Event-triggered bipartite consensus over cooperation-competition networks under DoS attacks

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Science China(Technological Sciences) 2021年第1期64卷 157-168页

作者： hu Aihua PARK j H CAO jinDe hu ManFeng LUO YiPing School of Science Jiangnan UniversityWuxi 214122China Department of Electrical Engineering Yeungnam UniversityKyongsan 38541Korea School of Mathematics Southeast UniversityNanjing 210096China College of Electrical and Information Engineering Hunan Institute of EngineeringXiangtan 411104China

This paper addresses the bipartite consensus over cooperation-competition networks affected by denial-of-service(DoS) *** that a network consists of multiple interactive agents, and the relationship between neighboring agents is cooperative or competitive. Meanwhile, information transmission among the agents is unavailable during the intervals of attacks. In order to save communication resources and exclude the Zeno behavior, an event-triggered scheme depending on the sampled-data information from neighboring agents is proposed, and efficient defense strategies in response to the attacks are put *** that the frequency and duration of DoS attacks meet certain requirements, then according to the signed graph theory,the La Salle’s invariance principle, and the convergence of monotone sequences, the results of bipartite consensus via the eventtriggered protocol are provided, which are mainly related to the communication topology of the network, the sampling period,and the threshold parameters in the event-triggered scheme. It is shown that the bipartite consensus is realized even though the DoS attacks take place frequently. Furthermore, this paper discusses the bipartite consensus in the presence of DoS attacks with a random unsuccessful rate. Finally, numerical simulations illustrate the theoretical results.

关键词： bipartite consensus denial-of-service(DoS)attack event-triggered scheme structural balance multiagent system

Gαq takes centre stage in multiple sclerosis pathogenesis

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Cellular & Molecular Immunology 2017年第5期14卷 401-402页

作者： eric j Downer School of Medicine Discipline of PhysiologyTrinity Biomedical Sciences Institute Trinity Col-lege Dublin Dublin 2 Ireland

There is no cure for multiple sclerosis （MS）; however, a number of strategies exist for disease management, including medications that reduce the frequency of relapses and long-term accrual of disability.1 However, the fact that MS therapies can be partially effective and have the risk of side effects, in addition to the observation that disability often continues to worsen despite immunotherapy, has highlighted the need for novel therapeutic targets in the disease.

关键词： Gαq centre stage multiple sclerosis

Chromate and selenate hydrocalumite solid solutions and their applications in waste treatment

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Science China(Life Sciences) 2005年第Z1期48卷 165-173页

作者： eric j. Reardon Department of Earth Sciences University of Waterloo Waterloo Ontario Canada N2L 3G1

Hydrocalumite, a calcium aluminate hydrate phase, consists of positively-charged structure units, and is therefore an ideal candidate for accommodating anionic contaminants. In this study, a series of batch experiments was carried out to examine the uptake of chromate and selenate by hydrocalumite. To determine the uptake capacity and long-term stability, hydrocalumite solid solutions between chromate/selenate and hydroxyl were synthesized over a reaction time of more than one year. At a ratio of water to initial solids added (CaAl2O4+CaO) of 75: 1, the maximum uptake capacities were over 77 and 114 g/kg for Cr and Se, *** values are very close to the theoretical uptake capacities of chromate and selenate hydrocalumite end-members (81 and 118 g/kg, respectively). The oxyanion removal efficiency from solution was above 95%. Due to the high uptake capacity and anion removal efficiency of hydrocalumites, their application in wastewater treatment is promising. Hydrocalumites are also important hydration products of cementitious materials and the long-term stability of these phases is of significance for application in solidification/stabilization technology.

关键词： chromate, selenate, hydrocalumite, uptake capacity, stability.