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电子产品世界 2021年第2期28卷 1-2,5页

作者： eric goodness Sandra Notardonato Gartner

工业物联网(IIoT)解决方案与运营技术(OT)的区别在于,前者通过物联网端点以经济高效的方式从所有联网资产中采集高速、复杂的机器数据,而且所采集的数据数量和质量均高于OT。IIoT解决方案整合并协调曾经的“孤岛式”数据源,提高整个企... 详细信息

工业物联网(IIoT)解决方案与运营技术(OT)的区别在于,前者通过物联网端点以经济高效的方式从所有联网资产中采集高速、复杂的机器数据,而且所采集的数据数量和质量均高于OT。IIoT解决方案整合并协调曾经的“孤岛式”数据源,提高整个企业和合作伙伴的数据可访问性。IIoT解决方案还可以通过专业数据分析,改进对各异构资产群的技术和业务洞察力以及相关行动。

关键词：工业物联网机器数数据分析运营技术数据源解决方案数量和质量合作伙伴

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Wheat yield prediction by zero sink and equilibrium-type soil phosphorus tests

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Pedosphere 2022年第4期32卷 543-554页

作者： Walter W.WENZEL Cornelia MESMER eric J.FLORIDA Markus PUSCHENREITER Holger KIRCHMANN Institute of Soil Research Department of Forest and Soil SciencesUniversity of Natural Resources and Life Sciences ViennaKonrad-Lorenz-Straße 24Tulln A-3430Austria College of Agriculture and Forestry Mindanao State University at NaawanNaawan 9023Philippines Department of Soil and Environment Swedish University of Agricultural SciencesBox 701475007 UppsalaLennart Hjelms väg 9Uppsala 75651Sweden

Diffusive gradients in thin films(DGT)measurements have been shown to outperform other phosphorus(P)tests in soils with strong P sorption,but this has not been confirmed for moderately weathered European soils.We compared the performance of DGT in predicting wheat grain yield in Swedish long-term fertility experiments with those of standard intensity(water-extractable P(P-H2O))and quantity(ammonium lactate-extractable P(P-AL))tests.A Mitscherlich-type model was used to fit wheat yield response to P application rates(0,15,30 or 35,and 45 kg P ha-1 year-1)in each individual trial replicate to estimate the maximum yield.For trials with clear plateau-type yield responses and the goodness of fit(R2)>0.75,relative yields(RYs)were calculated for each P treatment and plotted against the soil P test results(n=143).The goodness of the Mitscherlich-type fits decreased in the following order:DGT-measured P(P-DGT)(R2=0.35)>P-H2O(R2=0.18)>P-AL(R2=0.13).When excluding soils with P-AL:P-DGT≥0.1 L g-1,R2 was considerably improved to 0.55 for P-AL,0.46 for P-H2O,and 0.65 for P-DGT(n=61).At 95%of maximum yield,the upper limit of P deficiency for P-DGT was 44.8(the soils with P-AL:P-DGT<0.1 L g-1)and 61.9μg L-1(all soils),falling within the range reported for other European and Australian soils(6.0–142μg L-1).We show that in the investigated Swedish soils,DGT performed better than the quantity and intensity tests,which is attributed to its ability to capture P diffusion and resupply from the soil solid phase,similar to plant roots in the rhizosphere.

关键词： ammonium lactate-extractable phosphorus diffusive gradients in thin films(DGT) distribution coefficient long-term field experiment Mitscherlich-type model

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goodness-of-Fit Test for Volume Equations of Three Timber Species in South East Cameroon

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Journal of Environmental Science and Engineering(B) 2012年第5期1卷 600-605页

作者： eric Ngbanye Ntabe John Adebayo Akande Lawrence Adetunji Kehinde Department of Forestry Faculty of Agronomy & Agricultural Sciences University of Dschang Dschang 222 Cameroon Department of Crop Production Soil & Environmental Management BOWEN University lwo Osun Osun State Nigeria Department of Agricultural Economics Osun State University Osogbo Osun Osun State Nigeria

A study on the validity of volume equations currently used for three timber species, Entandrophragma cylindricum, Erythrophleum ivorensis and Pericopsis elata (Sapelli, Tali and Assamela respectively) in south east Cameroon, was conducted between the months of July and September, 2007 to evaluate their suitability for the site. Twenty-two percent sampling intensity was conducted within annual allowable cuts and diameter readings taken on standing trees with the aid of a wide band Relascope. A non linear regression equation model was employed to compute volume equations and the student"s t-test for the analysis of the existing models. Based on individual tree volumes within stands, new equations for the three species were constructed. A comparison was made between the new equations and those that were being used at the site. Results indicated a total standing volume of 0.007 m3/ha obtained for the three species (Sapelli 0.003 m3/ha, Tali 0.002 m3/ha and Assamela 0.002 m3/ha). Two new volume equation models [B] and [C] were retained for their goodness-of-fit with [B] for Assamela and [C] for Sapelli and Tali. Results also showed that a total volume of 0.005 m3/ha was underestimated for the three species (Sapelli 0.002 m3/ha, Tali 0.001 m3/ha and Assamela 0.002 m3/ha) when existing volume equations were applied. It is imperative to construct new volume equations that are compatible with the ecological characteristics of the site using representative samples. Setting-up appropriate methods for their validation shall also serve as checks to future management errors.

关键词：材积方程用材树种喀麦隆体能测试方程模型非线性回归沙比利检验分析

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