光镍协同催化合成对甲氧基苯丙酮

光-镍协同催化反应是一种新兴的合成方法,具有产率高、条件温和、适用范围广等多种优点。我们以可持续发展理念为出发点,利用常见的工业原料芳香羧酸化合物和乙烯在温和的反应条件下高效合成了高附加值的芳基酮类化合物。该反应是第一例在空气氛围下光镍协同催化的芳基羧酸和工业气体乙烯的反应。这种方法实现了资源高效利用,操作简单,易于学生掌握,填补了基础有机化学实验教学中光化学反应相关内容的空白,具有重要的应用价值和教学价值。

Increased excitatory amino acid transporter 2 levels in basolateral amygdala astrocytes mediate chronic stress–induced anxiety-like behavior

The conventional perception of astrocytes as mere supportive cells within the brain has recently been called into question by empirical evidence, which has revealed their active involvement in regulating brain function and encoding behaviors associated with emotions.Specifically, astrocytes in the basolateral amygdala have been found to play a role in the modulation of anxiety-like behaviors triggered by chronic stress. Nevertheless, the precise molecular mechanisms by which basolateral amygdala astrocytes regulate chronic stress–induced anxiety-like behaviors remain to be fully elucidated. In this study, we found that in a mouse model of anxiety triggered by unpredictable chronic mild stress, the expression of excitatory amino acid transporter 2 was upregulated in the basolateral amygdala. Interestingly, our findings indicate that the targeted knockdown of excitatory amino acid transporter 2 specifically within the basolateral amygdala astrocytes was able to rescue the anxiety-like behavior in mice subjected to stress. Furthermore, we found that the overexpression of excitatory amino acid transporter 2 in the basolateral amygdala, whether achieved through intracranial administration of excitatory amino acid transporter 2agonists or through injection of excitatory amino acid transporter 2-overexpressing viruses with GfaABC1D promoters, evoked anxiety-like behavior in mice. Our single-nucleus RNA sequencing analysis further confirmed that chronic stress induced an upregulation of excitatory amino acid transporter 2 specifically in astrocytes in the basolateral amygdala. Moreover, through in vivo calcium signal recordings, we found that the frequency of calcium activity in the basolateral amygdala of mice subjected to chronic stress was higher compared with normal mice.After knocking down the expression of excitatory amino acid transporter 2 in the basolateral amygdala, the frequency of calcium activity was not significantly increased, and anxiety-like behavior was obviously mitigated. Additionally, administration of an excitatory amino acid transporter 2 inhibitor in the basolateral amygdala yielded a notable reduction in anxiety level among mice subjected to stress. These results suggest that basolateral amygdala astrocytic excitatory amino acid transporter 2 plays a role in in the regulation of unpredictable chronic mild stress-induced anxiety-like behavior by impacting the activity of local glutamatergic neurons, and targeting excitatory amino acid transporter 2 in the basolateral amygdala holds therapeutic promise for addressing anxiety disorders.

Vibration-assisted vat photopolymerization for pixelated-aliasing-free surface fabrication

Mask image projection-based vat photopolymerization(MIP-VPP)offers advantages like low cost,high resolution,and a wide material range,making it popular in industry and education.Recently,MIP-VPP employing liquid crystal displays(LCDs)has gained traction,increasingly replacing digital micromirror devices,particularly among hobbyists and in educational settings,and is now beginning to be used in industrial environments.However,LCD-based MIP-VPPsuffers from pronounced pixelated aliasing arising from LCD’s discrete image pixels and itsdirect-contact configuration in MIP-VPP machines,leading to rough surfaces on the 3D-printed parts.Here,we propose a vibration-assisted MIP-VPP method that utilizes a microscalevibration to uniformize the light intensity distribution of the LCD-based mask image on VPP’s building platform.By maintaining the same fabrication speed,our technique generates asmoother,non-pixelated mask image,reducing the roughness on flat surfaces and boundary segments of 3D-printed parts.Through light intensity modeling and simulation,we derived an optimal vibration pattern for LCD mask images,subsequently validated by experiments.We assessed the surface texture,boundary integrity,and dimensional accuracy of componentsproduced using the vibration-assisted approach.The notably smoother surfaces and improved boundary roughness enhance the printing quality of MIP-VPP,enabling its promisingapplications in sectors like the production of 3D-printed optical devices and others.

Progress on two-dimensional ferrovalley materials

The electron's charge and spin degrees of freedom are at the core of modern electronic devices. With the in-depth investigation of two-dimensional materials, another degree of freedom, valley, has also attracted tremendous research interest. The intrinsic spontaneous valley polarization in two-dimensional magnetic systems, ferrovalley material, provides convenience for detecting and modulating the valley. In this review, we first introduce the development of valleytronics.Then, the valley polarization forms by the p-, d-, and f-orbit that are discussed. Following, we discuss the investigation progress of modulating the valley polarization of two-dimensional ferrovalley materials by multiple physical fields, such as electric, stacking mode, strain, and interface. Finally, we look forward to the future developments of valleytronics.

Unveiling the oral-gut connection:chronic apical periodontitis accelerates atherosclerosis via gut microbiota dysbiosis and altered metabolites in apoE^(−/−)Mice on a high-fat diet

The aim of this study was to explore the impact of chronic apical periodontitis(CAP)on atherosclerosis in apoE^(−/−)mice fed high-fat diet(HFD).This investigation focused on the gut microbiota,metabolites,and intestinal barrier function to uncover potential links between oral health and cardiovascular disease(CVD).In this study,CAP was shown to exacerbate atherosclerosis in HFD-fed apoE^(−/−)mice,as evidenced by the increase in plaque size and volume in the aortic walls observed via Oil Red O staining.16S rRNA sequencing revealed significant alterations in the gut microbiota,with harmful bacterial species thriving while beneficial species declining.Metabolomic profiling indicated disruptions in lipid metabolism and primary bile acid synthesis,leading to elevated levels of taurochenodeoxycholic acid(TCDCA),taurocholic acid(TCA),and tauroursodeoxycholic acid(TDCA).These metabolic shifts may contribute to atherosclerosis development.Furthermore,impaired intestinal barrier function,characterized by reduced mucin expression and disrupted tight junction proteins,was observed.The increased intestinal permeability observed was positively correlated with the severity of atherosclerotic lesions,highlighting the importance of the intestinal barrier in cardiovascular health.In conclusion,this research underscores the intricate interplay among oral health,gut microbiota composition,metabolite profiles,and CVD incidence.These findings emphasize the importance of maintaining good oral hygiene as a potential preventive measure against cardiovascular issues,as well as the need for further investigations into the intricate mechanisms linking oral health,gut microbiota,and metabolic pathways in CVD development.

High-entropy alloys in thermoelectric application:A selective review

Since the superior mechanical,chemical and physical properties of high-entropy alloys(HEAs)were discovered,they have gradually become new emerging candidates for renewable energy applications.This review presents the novel applications of HEAs in thermoelectric energy conversion.Firstly,the basic concepts and structural properties of HEAs are introduced.Then,we discuss a number of promising thermoelectric materials based on HEAs.Finally,the conclusion and outlook are presented.This article presents an advanced understanding of the thermoelectric properties of HEAs,which provides new opportunities for promoting their applications in renewable energy.

A Modified Principal Component Analysis Method for Honeycomb Sandwich Panel Debonding Recognition Based on Distributed Optical Fiber Sensing Signals

The safety and integrity requirements of aerospace composite structures necessitate real-time health monitoring throughout their service life.To this end,distributed optical fiber sensors utilizing back Rayleigh scattering have been extensively deployed in structural health monitoring due to their advantages,such as lightweight and ease of embedding.However,identifying the precise location of damage from the optical fiber signals remains a critical challenge.In this paper,a novel approach which namely Modified Sliding Window Principal Component Analysis(MSWPCA)was proposed to facilitate automatic damage identification and localization via distributed optical fiber sensors.The proposed method is able to extract signal characteristics interfered by measurement noise to improve the accuracy of damage detection.Specifically,we applied the MSWPCA method to monitor and analyze the debonding propagation process in honeycomb sandwich panel structures.Our findings demonstrate that the training model exhibits high precision in detecting the location and size of honeycomb debonding,thereby facilitating reliable and efficient online assessment of the structural health state.

The mechanism of Yinchenhao decoction in treating obstructivejaundice- induced liver injury based on Nrf2 signaling pathway

BACKGROUND Obstructive jaundice(OJ)is caused by bile excretion disorder after partial or complete bile duct obstruction.It may cause liver injury through various mechanisms.Traditional Chinese medicine(TCM)has a lot of advantages in treating OJ.The recovery of liver function can be accelerated by combining Chinese medicine treatment with existing clinical practice.Yinchenhao decoction(YCHD),a TCM formula,has been used to treat jaundice.Although much progress has been made in recent years in understanding the mechanism of YCHD in treating OJ-induced liver injury,it is still not clear.AIM To investigate chemical components of YCHD that are effective in the treatment of OJ and predict the mechanism of YCHD.METHODS The active components and putative targets of YCHD were predicted using a network pharmacology approach.Gene Ontology biological process and Kyoto Encyclopedia of Genes and Genomes path enrichment analysis were carried out by cluster profile.We predicted the biological processes,possible targets,and associated signaling pathways that YCHD may involve in the treatment of OJ.Thirty male Sprague–Dawley rats were randomly divided into three groups,each consisting of 10 rats:the sham group(Group S),the OJ model group(Group M),and the YCHDtreated group(Group Y).The sham group only received laparotomy.The OJ model was established by ligating the common bile duct twice in Groups M and Y.For 1 wk,rats in Group Y were given a gavage of YCHD(3.6 mL/kg)twice daily,whereas rats in Groups S and M were given the same amount of physiological saline after intragastric administration daily.After 7 d,all rats were killed,and the liver and blood samples were collected for histopathological and biochemical examinations.Total bilirubin(TBIL),direct bilirubin(DBIL),alanine aminotransferase(ALT),and aspartate transaminase(AST)levels in the blood samples were detected.The gene expression levels of inducible nitric oxide synthase(iNOS)and endothelial nitric oxide synthase(eNOS),and the nucleus positive rate of NF-E2 related factor 2(Nrf2)protein were measured.Western blot analyses were used to detect the protein and gene expression levels of Nrf2,Kelchlike ECH-associated protein 1,NAD(P)H quinone dehydrogenase 1(NQO1),and glutathione-Stransferase(GST)in the liver tissues.One-way analysis of variance was used to evaluate the statistical differences using the statistical package for the social sciences 23.0 software.Intergroup comparisons were followed by the least significant difference test and Dunnett’s test.RESULTS The effects of YCHD on OJ involve biological processes such as DNA transcription factor binding,RNA polymerase II specific regulation,DNA binding transcriptional activator activity,and nuclear receptor activity.The protective effects of YCHD against OJ were closely related to 20 pathways,including the hepatitis-B,the mitogen-activated protein kinase,the phosphatidylinositol 3-kinase/protein kinase B,and tumor necrosis factor signaling pathways.YCHD alleviated the swelling and necrosis of hepatocytes.Following YCHD treatment,the serum levels of TBIL(176.39±17.03μmol/L vs 132.23±13.88μmol/L,P<0.01),DBIL(141.41±14.66μmol/L vs 106.43±10.88μmol/L,P<0.01),ALT(332.07±34.34 U/L vs 269.97±24.78 U/L,P<0.05),and AST(411.44±47.64 U/L vs 305.47±29.36 U/L,P<0.01)decreased.YCHD promoted the translocation of Nrf2 into the nucleus(12.78±0.99%vs 60.77±1.90%,P<0.001).After YCHD treatment,we found a decrease in iNOS(0.30±0.02 vs 0.20±0.02,P<0.001)and an increase in eNOS(0.18±0.02 vs 0.32±0.02,P<0.001).Meanwhile,in OJ rats,YCHD increased the expressions of Nrf2(0.57±0.03 vs 1.18±0.10,P<0.001),NQO1(0.13±0.09 vs 1.19±0.07,P<0.001),and GST(0.12±0.02 vs 0.50±0.05,P<0.001),implying that the potential mechanism of YCHD against OJ-induced liver injury was the upregulation of the Nrf2 signaling pathway.CONCLUSION OJ-induced liver injury is associated with the Nrf2 signaling pathway.YCHD can reduce liver injury and oxidative damage by upregulating the Nrf2 pathway.

针灸对肠易激综合征自主神经系统的作用

肠易激综合征(IBS)是一种反复发作的腹痛、腹胀和排便不规律的功能性肠病,其发病机制较为复杂。由于其高发病率和症状反复出现,严重影响了患者的生活质量。自主神经系统(ANS)包括交感神经系统、副交感神经系统和肠道神经系统,而肠易激综合征发病的原因之一是由于自主神经系统功能障碍导致的胃肠动力和肠道分泌紊乱。目前研究表明,针灸作为一种传统的中医疗法,治疗肠易激综合征是有效的。同时,针灸治疗肠易激综合征的机制研究越来越受到重视,现代方法的应用也取得了重大进展,其中,ANS是胃肠道和中枢神经系统之间双向信息传递的关键途径,在针灸治疗IBS中发挥着重要作用。有证据表明,针灸可以减轻肠易激综合征的负面影响,如炎症信号的改变、结肠和中枢神经组织中神经递质水平的降低以及肠道菌群的平衡。文章回顾并讨论了针灸通过ANS治疗IBS的可能作用机制,包括调节胃肠动力、改善内脏超敏反应和肠-脑-微生物群轴的神经支配,同时综述了针灸治疗IBS在临床中的可用证据。然而,ANS和肠脑微生物群轴之间的关系尚不清楚,需要进一步研究。

锂硫银锗矿固态电解质研究进展

全固态电池因其较高的安全性和能量密度而成为下一代电动汽车和智能电网用储能器件的重点研究方向之一。开发具有高室温锂离子电导率、化学/电化学稳定性优异、对电极材料兼容性优异等特点的固态电解质材料是推动全固态电池发展的重要研究课题之一。硫化物电解质因其相对较高的室温电导率(~10^(-3) S·cm^(-1))、较低的电解质/电极固-固界面阻抗等优点而在众多无机固体电解质材料中成为研究热点。本文基于作者多年研究成果和当前国内外发表的相关工作,从电解质的结构、离子传导、合成、综合性能改善及在全固态电池中的应用等方面系统总结了锂硫银锗矿固态电解质材料研究,并分析了该类电解质面临的问题和挑战,最后探讨了其未来可能的研究方向和发展趋势。

All-optical controlled-NOT logic gate achieving directional asymmetric transmission based on metasurface doublet

Optical logic gates play important roles in all-optical logic circuits,which lie at the heart of the next-generation optical computing technology.However,the intrinsic contradiction between compactness and robustness hinders the development in this field.Here,we propose a simple design principle that can possess multiple-input-output states according to the incident circular polarization and direction based on the metasurface doublet,which enables controlled-NOT logic gates in infrared region.Therefore,the directional asymmetric electromagnetic transmission can be achieved.As a proof of concept,a spin-dependent Janus metasurface is designed and experimentally verified that four distinct images corresponding to four input states can be captured in the far-field.In addition,since the design method is derived from geometric optics,it can be easily applied to other spectra.We believe that the proposed metasurface doublet may empower many potential applications in chiral imaging,chiroptical spectroscopy and optical computing.

卤化物固态电解质研究进展

全固态电池因其高能量密度和高安全性而成为具有发展前景的下一代储能技术。开发具有高室温离子电导率、优异化学/电化学稳定性、良好正/负极兼容性的固态电解质是实现全固态电池实用化的关键。卤化物固态电解质因其优异的电化学窗口、高正极稳定性、可接受的室温锂离子电导率等优势,受到了广泛的关注。本文通过对近年来卤化物电解质的相关研究进行总结,综述了该类电解质的组成、结构、离子传导路径及制备方法,并分析了金属卤化物电解质的电导率、稳定性特点,归纳了近年来该电解质在全固态电池中具有代表性的应用,并基于以上总结和分析,指出了卤化物固态电解质的研究难点及发展方向。

Effect of heat treatment on microstructure,mechanical and tribological properties of in-situ (TiC+TiB)/TC4 composites by casting

To enhance the performance of in-situ synthesized 6vol.%(Ti C+Ti B)/TC4 titanium matrix composites fabricated by casting,a variety of heat treatment processes were carried out.Upon conducting microstructure observations following various heat treatments,it was found that the composites exhibit a basketweave microstructure,consisting of an α phase and a transformed β phase.The sizes of(α+β) phases were found to be refined to varying degrees after the heat treatment processes,while the morphology of Ti B remains largely unchanged and Ti C becomes granulated.Compressive testing revealed that all composites subjected to different heat treatments demonstrate a notable increase in ultimate compressive strength as well as a slight improvement in plasticity compared to the as-cast state.The results of the tribological performance test indicated that the heat-treated composites exhibit lower average friction coefficient,specific wear rate,and worn surface roughness compared to the as-cast composite.Among the heat treatment processes studied,the composite solution heated at 1,150 °C/1 h followed by air cooling,then 950 °C/1 h followed by air cooling,and finally 500 °C/4 h followed by air cooling,demonstrates the highest levels of hardness,compressive strength,and wear resistance.These improvements are attributed to the combined effects of solid solution strengthening,grain refinement,and the pinning of dislocation slip.

A thermal conductivity switch via the reversible 2H–1T′phase transition in monolayer MoTe_(2)

The two-dimensional(2D)material-based thermal switch is attracting attention due to its novel applications,such as energy conversion and thermal management,in nanoscale devices.In this paper,we observed that the reversible 2H–1T′phase transition in MoTe_(2)is associated with about a fourfold/tenfold change in thermal conductivity along the X/Y direction by using first-principles calculations.This phenomenon can be profoundly understood by comparing the Mo–Te bonding strength between the two phases.The 2H-MoTe_(2)has one stronger bonding type,while 1T′-MoTe_(2)has three weaker types of bonds,suggesting bonding inhomogeneity in 1T′-MoTe_(2).Meanwhile,the bonding inhomogeneity can induce more scattering of vibration modes.The weaker bonding indicates a softer structure,resulting in lower phonon group velocity,a shorter phonon relaxation lifetime and larger Gr¨uneisen constants.The impact caused by the 2H to 1T′phase transition in MoTe_(2)hinders the propagation of phonons,thereby reducing thermal conductivity.Our study describes the possibility for the provision of the MoTe_(2)-based controllable and reversible thermal switch device.

Comprehensively evaluate the short outcome of small bowel obstruction:A novel medical-economic score system

BACKGROUND Small bowel obstruction(SBO)still imposes a substantial burden on the health care system.Traditional evaluation systems for SBO outcomes only focus on a single element.The comprehensive evaluation of outcomes for patients with SBO remains poorly studied.Early intensive clinical care would effectively improve the short-term outcomes for SBO,however,the full spectrum of the potential risk status regarding the high complication-cost burden is undetermined.AIM We aim to construct a novel system for the evaluation of SBO outcomes and the identification of potential risk status.METHODS Patients who were diagnosed with SBO were enrolled and stratified into the simple SBO(SiBO)group and the strangulated SBO(StBO)group.A principal component(PC)analysis was applied for data simplification and the extraction of patient characteristics,followed by separation of the high PC score group and the low PC score group.We identified independent risk status on admission via a binary logistic regression and then constructed predictive models for worsened management outcomes.Receiver operating characteristic curves were drawn,and the areas under the curve(AUCs)were calculated to assess the effectiveness of the predictive models.RESULTS Of the 281 patients,45 patients(16.0%)were found to have StBO,whereas 236 patients(84.0%)had SiBO.Regarding standardized length of stay(LOS),total hospital cost and the presence of severe adverse events(SAEs),a novel principal component was extracted(PC score=0.429×LOS+0.444×total hospital cost+0.291×SAE).In the multivariate analysis,risk statuses related to poor results for SiBO patients,including a low lymphocyte to monocyte ratio(OR=0.656),radiological features of a lack of small bowel feces signs(OR=0.316)and mural thickening(OR=1.338),were identified as risk factors.For the StBO group,higher BUN levels(OR=1.478)and lower lymphocytes levels(OR=0.071)were observed.The AUCs of the predictive models for poor outcomes were 0.715(95%CI:0.635-0.795)and 0.874(95%CI:0.762-0.986)for SiBO and StBO stratification,respectively.CONCLUSION The novel PC indicator provided a comprehensive scoring system for evaluating SBO outcomes on the foundation of complication-cost burden.According to the relative risk factors,early tailored intervention would improve the short-term outcomes.

闽三角城市群生态环境脆弱性及其驱动力

生态安全是地区社会经济可持续发展的基本前提之一,而生态环境脆弱性会威胁地区的生态安全,进行生态环境脆弱性评价具有重要意义。以闽三角城市群为例,分别选取2000年和2015年的高程、坡度、岩性、土壤类型、NDVI、年均降水量、年均温、人口密度、人均GDP、路网密度、景观多样性、土地利用程度和工业固体废弃物排放量等13个指标,基于空间主成分分析法,并结合全局Moran'I和LISA聚类图,从整体特征、空间差异、空间集聚、地类脆弱性分异以及驱动力5个方面,探讨闽三角城市群的生态环境脆弱性及其驱动力。结果表明:2000—2015年间,闽三角城市群的生态环境脆弱性整体处于中度脆弱,但呈现出由中度脆弱向重度脆弱过渡的趋势;2000—2015年间,生态环境脆弱性呈现出由东南沿海向西北内陆逐渐增强的整体趋势,并存在明显的地带性特征,东南沿海增长不明显,部分地区有所下降,而西北内陆增长明显;生态环境脆弱性存在显著的空间自相关性,且为显著正相关,在西北部山区地带为显著的高高聚集,在东南沿海平原地带为显著的低低聚集,16年间集聚性特征在空间上有所迁移和扩张;2000—2015年间,生态环境脆弱性在各地类存在着一定的异质性,其生态环境脆弱性指数大小顺序始终为:林地>未利用地>草地>耕地>水域>建设用地,整体由中度脆弱向重度脆弱过渡;2000—2015年间,生态环境脆弱性的驱动力有所变化,但人口密度、景观多样性、岩性和土壤类型一直是闽三角城市群生态环境脆弱性主要的驱动力。

Rapid Screening of Recombinant Plasmids by Direct Colony Quantitative Real-Time PCR

Quantitative real-time PCR (qPCR) was applied to rapid screening of positive plasmid clones. Insert-specific primer pairs were used in qPCR colony screening, and false positive colonies could easily be distinguished from true positive ones by comparing their Ct values. In addition, qPCR is particularly suitable when amplicon is small (<150 bp). This method is sensitive, simple and fast, obviates the need for gel electrophoresis, and is a cost-effective alternative to the traditional PCR approach.

62例原发性乳腺弥漫大B细胞淋巴瘤临床病例分析

目的:探讨原发性乳腺弥漫大B细胞淋巴瘤(primary breast diffuse large B-cell lymphoma,PBDLBCL)的临床病理特点、治疗方案及预后。方法:收集湖南省人民医院、湖南省肿瘤医院和邵阳珂信肿瘤医院2006年1月至2016年12月62例PBDLBCL患者的临床病理资料,采用Kaplan-Meier法进行单因素分析,多因素分析采用Cox回归模型。结果:62例患者均为女性,年龄26~71岁,中位年龄47岁。随访6~105个月,3年患者总生存率(overall survival,OS)为71.0%,5年OS为51.0%。单因素生存分析显示,临床分期、IPI评分、化疗方案、Ki-67、LDH水平、Myc/Bcl-2蛋白共表达的患者3、5年OS差异具有统计学意义(P<0.05)。Cox回归模型多因素分析结果显示,Myc/Bcl-2蛋白共表达为影响患者预后的独立因素。结论:Myc/Bcl-2蛋白共表达为影响患者预后的独立因素,治疗仍以免疫化疗为主,结合局部放疗。

基于随机森林的遥感土地利用分类及景观格局分析

2009年福建平潭综合实验区设立,作为闽台合作及国家对外开放的窗口,其土地利用变化主要受社会经济因素的影响和自然地理环境的制约,也与未来的土地利用规划密切相关.本文利用1990、2000、2010和2017年4期Landsat遥感影像数据,定量分析近27年的土地利用变化对景观格局的影响.结果表明:(1)在选择合适训练样本的情况下,利用随机森林方法可获得较高的遥感土地利用分类精度(4期遥感影像分类的总体精度均在87%以上,Kappa系数均在0.84以上);(2)1990~2017年,水域面积急剧减少31.04 km2,流失的水域主要转化为建设用地和林地;建设用地增加40.98 km2,年平均增长1.52 km2.近十年呈快速增长趋势,年平均增长3.87 km2;(3)在斑块类型级别上,逐年增加的建设用地导致最大斑块占景观面积比例(LPI)、聚合度(AI)和边缘密度(ED)呈上升趋势,其中LPI受到建设用地增加的影响最显著.在景观类型级别上,多样性(SHDI)和景观形状(LSI)呈下降趋势.

木兰溪下游沿岸土壤钴元素高光谱建模研究

通过测定野外采集的43个土壤样本的高光谱数据和钴元素含量,并结合光谱处理方法、相关性分析法和模型拟合法,得到最佳估算模型.主要结论如下:土壤钴元素敏感波段分布有480~490、610~620、690~800、960~980、1 070~1 080、1 110~1 160、1 240~1 280、1 340~1 450、1 530~1 540、1 750~1 760、1 890~1 940、2 120~2 240、2 300~2 320 nm;经过Savitzky-Golay平滑滤波后的对数倒数一阶导数、对数倒数二阶导数光谱处理值和波段深度值建模结果较好,并且不同模型拟合结果差异不明显;土壤钴元素最佳高光谱估算模型为y=12.899+2 575.429LRFD920 nm+930.98BD730 nm.