3164 research outputs found
Sort by
EXPERIMENT OF FUNCTIONAL CONFIRMATION ON LEAD RUBBER BEARING (LRB) UNDER LOW TEMPERATURE
Get PDFIt is a important task for a designer to evaluate the vibration characteristics of Lead Rubber Bearing (LRB) when it is used in severe cold environment. That is because the stiffness of rubber increases some how when the temperature decreases less than -10℃. So that the experiment was done in low room temperature up to -30℃ on LRB specimen with different frequencies, amplitudes and vertical forces. Results show that if we take its small changes of vibration characteristics of LRB into account, there is no problem for designer to use LRB up to -30℃ environment.application/pdfjournal articl
210-year ice core records of dust storms, volcanic eruptions and acidification at Site-J, Greenland (scientific note)
Get PDF210-year records of dust concentration, electrical conductivity, acidity (pH), non-sea salt sulfate (nss sulfate) and nitrate concentrations were obtained for an ice core from Site-J, Greenland. The ice core was well dated by counting annual cycles of the δ^O profile and by tuning with time markers established for tritium peaks and the Laki 1783 eruption signal. Dust records in both ice cores from Site-J and Crete suggest that dust storms occurred in 1818,1900,1919,1936 and 1943 over Greenland. Electrical conductivity shows remarkable peaks probably due to volcanic eruptions with VEI larger than 4. The anthropogenic effect on precipitation chemistry started in ca. 1860,40 years earlier than the time previously reported. Nss sulfate increased remarkably, much more than nitrate, because of the rapid increase in solid fossil fuel combustion, but by the early 1970's, the nitrate concentration exceeded the nss sulfate concentration due to the intense increase in liquid fossil fuel combustion since the 1950's. The decrease in sulfate and nitrate concentrations started in the early 1970's. This is attributed to the spread of suppression facilities for anthropogenic pollutants emitted by the combustion of solid and liquid fossil fuels.application/pdfjournal articl
Solid-phase spectrophotometric determination of trace copper after collection as its bathocuproinedisulfonate chelate anion on chitin
Get PDFkeyword:collection as copper bathocuproinedisulfonate chelate anion on protonated chitinjournal articl
北見工業大学 雪氷防災研究室 研究資料 道央・道東・道北41 地点における広域積雪調査（データ集：2020年）
Get PDF北海道の道央・道東における積雪分布の年次変動や大雪時の積雪特性を把握することを目的に，雪氷防災研究室では2014年以降，毎年同時期に同じ地点での積雪観測を実施している（全32地点）．今年は日露共同観測を実施中のため，2019年に引き続き道北9 地点を追加して実施した．本資料は2020年2月20日から3月3日にかけて実施した北海道内41地点における広域積雪調査のデータ集である．以下，調査地点および調査スケジュール，調査方法および調査データについて記す．datase