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In the one half part, according to the strontium nature, thermodynamic calculation of correlative reaction and the principle of the vacuum aluminothermy reduction process, with the laboratory findings of preparation strontium by vacuum aluminothermy reduction compared and analyzed in different parameter conditions, a variety of factors which effect the decomposition rate of SrCO_3 and the percent reduction of strontia are gotten out. The factors include that the decomposition rate of SrCO_3 is influenced by different addition and pressure. They also include that the percent reduction of strontia is influenced by excess coefficient of reducing agent aluminium powder, the particle size of raw material or reducing agent, the pressure of barbecuing, temperature and reduction time. According to those, we can draw the conclusion as follows:(1) Decomposition temperature of SrCO_3 is decreased by adding carbon and alumina in different degree.(2) With quantitative carbon added under the vacuum condition, the decomposition temperature of SrCO_3 is decreased obviously, which can fall 150℃ compared with atmospheric pressure.(3) In keeping 1150℃ of 2.5h, under the 5Pa vacuum condition, the decomposition rate of SrCO_3 nearly keeps in 99% steadily.
在前半部分的真空铝热还原法中,根据锶的性质、相关反应的热力学计算及真空铝热还原法原理,通过对不同参数条件下的真空铝热还原法生产金属锶的实验结果的分析比较,得出了影响SrCO_3的分解率和氧化锶的还原率的种种因素,具体因素包括不同添加剂、不同气压对SrCO_3分解率的影响,还原剂铝粉的过量系数、原料与还原剂的粒度、制团压力、温度和还原时间等对氧化锶还原率的影响,得出具体结论如下:(1)添加碳和Al_2O_3能不同程度的降低SrCO_3的分解温度;(2)真空条件下加入一定量的碳可显著降低SrCO_3的分解温度,比之常压下可降低150℃之多;(3)在1150℃恒温2.5h、真空度达到5Pa的条件下,SrCO_3的分解率几乎保持稳定在99%;(4)氧化锶的还原率随还原剂过量系数的增大而增大,但是趋势越来越小,当过量系数超过25%后,氧化锶的还原率几乎不再增加;(5)氧化锶的还原率随原料与还原剂的粒度的变细而增加;(6)氧化锶的还原率随制团压力的增加而增加,但超过一定值后,氧化锶的还原率反而会下降;(7)氧化锶的还原率随还原温度的升高而增加;(8)氧化锶的还原率随还原时间延长而增加,在本实验条件下,超过2.5h趋于稳定。
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On the basis of core observation, grain analysis and the other data, the work area develops abundant tempestites, and the main types of tempestite sedimentary characteristics have been identified, including truncated structure, gutter cast, hummocky cross-stratification and scouring surface.
根据岩心观察和粒度等资料,工区内发育有丰富的浅湖风暴沉积,主要有截切构造、渠模、丘状交错层理和冲刷面等典型的风暴成因构造。
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The results indicate that the tempestite in the area has lots of rock types including clastic rocks, bioclastic limestones and volcaniclastic rocks. The cumulative probability plots have "high slope-multi-bouncing population-1 suspension population" pattern, multi segments pattern and "high slope 1 segment" pattern. The sedimentary structures include gutter cast, surface of scour, cut structure, graded bed, massive bedding, hummocky cross stratification, parallel bedding, ripples, contemporaneous deformation and Fugichnia. The grains distribution and sedimentary structures shier that the transportation medium is characterized by tractive current and gravity flow synchronously.
结果表明,该凹陷风暴沉积岩石类型丰富,包括各类碎屑岩、生物灰岩和火山碎屑岩粒度分布具有"高斜多跳悬式"、多段式和"高斜一段式"等多种样式沉积构造发育渠模、冲刷面、截切等底层面侵蚀构造和递变层理、块状层理、丘状层理、洼状层理、平行层理等构造,还发育有波痕和各种同生变形构造、生物逃逸构造等粒度分布和沉积构造反映出研究区兼有重力流和牵引流的水动力机制。
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Mechanical properties and combusition characteristics were affected evidently by the solid grain configuration and its character. Mechanical propertiesof the material system could be improved by adopting RDX and proper granularpropellants granularity rank-match. It is favorable to obtain progressivity burning effect byaffiliating increasing burning surface propellant grains. Affiliating fast burning componentthese burning rate regulator in the bond system can quicken burning rate of propellants andimprove burning progressivity.
固体颗粒形态及其性质对力学性能和燃烧性能具有较大的影响,采用RDX与适当颗粒度的固体发射药的粒度级配有利于改善力学性能,加入增面燃烧的发射药颗粒,有利于获得渐增性的燃烧效果,在粘合剂体系中加入速燃组份等燃速调节剂,可加快发射药的燃气生成速率,改善燃烧的渐增性。
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Applied to particle size 3mm below the magnetite, pyrrhotite, roasted ore, ilmenite and other materials wet magnetic separation, but also for coal, non-metallic minerals, building materials and other materials in addition to iron operation.
适用于粒度3mm 以下的磁铁矿、磁黄铁矿、焙烧矿、钛铁矿等物料的湿式磁选,也用于煤、非金属矿、建材等物料的除作业。
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Then, nanoparticles were prepared with a reprecipitation method and tested. We found that the nanoparticles with small size and lower poly-dispersion index can be prepared though shortening deposited time, decreasing concentration, increasing deposited temperature and adding surfactant.
利用二次沉淀法制备出三种有机分子不同粒径的纳米微粒,通过改变时间、浓度、温度、表面活性剂等实验条件分析这些因素对纳米微粒粒度的影响,发现缩短放置时间、减少有机稀溶液的注入量、升高放置温度、加入表面活性剂可以得到小粒度,低分散度的纳米微粒。
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Based on the analysis of sediment grain size,suspended matter concentration in the water and other indicators,and on the examination of tidal variation data in the Yangtze Estuary,we found that the seasonal erosion and deposition cycle is closely linked to the morphology,suspended matter concentration in the water,hydrodynamics,tidal variation,wind direction,etc.
通过对沉积物粒度、水体含沙量等指标的测试,并借助潮差等资料,探究了影响潮滩季节性沉积的因素,发现潮滩季节性沉积与潮滩基础地貌、水体含沙量、水动力、潮流等有密切关系;但在不同部位不同季节,各因素对潮滩冲淤影响程度各不相同。
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It's products--White Dove brand abrasives and abrasive products include brown aluminum oxide, white aluminum oxide, pink aluminum oxide, single crystal aluminum oxide; black and green silicon carbide; grinding wheels of various kinds, abrasive stones, chips, segments, cutting wheels; abrasive cloth, abrasive paper, belts, flapping wheels,discs; CBN and synthetic diamond grains and products, etc.
主要产品为白鸽牌磨料磨具,包括各种粒度的棕刚玉、白刚玉、铬刚玉、单晶刚玉、黑碳化硅、绿碳化硅磨料及高级耐火材料;各种固结磨具如砂轮、砂瓦、油石、磨头等;各种涂附磨具如砂布、砂纸、砂带、砂盘、钢纸砂盘、磨盘、页轮等;以及各种金刚石制品、CBN制品等。
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The effects of such parameters as temperature, pH, feeding rate,concentration, [NH_3]_T/_T molar ratio, surfactants and agitation, on the morphology and size of the particles, were studied and conclusions obtained are as follows:(1) The morphology and size of the particles are mainly decided by the species of nickel oxalates present.(2) Speeding up dissolution-recrystallization process benefits the preparation of the particles of being composed of a single species with uniform morphology and high aspect ratio.(3) The variations of nucleation and growth supersaturation under different conditions have definite effects on the morphology and size of the particles.(4) Adding PVP25 at a proper amount is beneficial to the preparation of fibrous nickel oxalate particles with high aspect ratio. 3 The formation mechanism as well as the morphology and size control of fibrous cobalt oxalate particlesThe cobalt oxalate particles with fibre morphology were prepared using CoCl_2 solution and mixed(NH_4)_2C_2O_4, NH_3·H_2O solution by a double jet process.
研究了温度、pH值、加料速度、浓度、[NH_3]_T/_T摩尔比、表面活性剂及其添加量、搅拌等对颗粒形貌与粒度的影响,主要结论为:(1)草酸镍化合物种类是决定颗粒形貌与粒度的最主要因素;(2)提高陈化中溶解—再结晶速度,有利于得到物相单一,形貌规整,轴向比大的粉末;(3)不同条件下,颗粒形核与生长过饱和度改变,也会对粉末形貌与粒度产生一定影响;(4)适量添加PVP25有利于大轴向比纤维状草酸镍的制备。3纤维状草酸钴的形成机理及其形貌与粒度控制采用CoCl_2溶液与(NH_4)_2C_2O_4和NH_3·H_2O混合溶液并流加料合成的方法,研究了纤维状草酸钴的制备。
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Although same belongs to front delta facies zone, and the foregoing reasons, the north depositional system controlled areas sediment smaller grain size, mostly siltstone, shaly siltstone (or a variety of calcium-pelitic siltstone) and mudstone portfolio, and there are lots of ostracods in these lithology, some ostracods formed stratigraphy, and north-west of the lithology of depositional systems is correspondingly more coarse, coarse pebbly, coarse sandstone and fine sandstone, and so on.
虽然同属三角洲前缘相带,但由于前述原因,造成北部沉积体系控制的地区沉积物粒度较细,多为粉砂岩、泥质粉砂岩和泥岩组合,且上述各种岩性中介形虫含量特别多、还有部分成层介形虫;而西北沉积体系控制的沉积物的岩性则相应粗得多,甚至有很多井钻遇砾岩、含砾粗砂岩、粗砂岩等粒度较粗的岩性。
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isograph:求根仪;等线图
isogranular 等粒度的 | isograph 求根仪;等线图 | isogyre 同消色线
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recrystallization:重结晶作用
它变质重结晶作用 变质重结晶作用(recrystallization)常简称重结晶作用. 在变质作用过程中,原有的矿物晶体由于重新生长而粒度变粗的作用(如细粒方解石变为中粗粒方解石等)或由于原