Results 91 to 100 of about 3,826 (163)
Optimization of Extraction Method for Easily Extractable Glomalin-Related Soil Protein from Calcareous Soil [PDF]
Glomalin-related soil protein (GRSP) secreted by arbuscular mycorrhizal fungi is widely distributed worldwide, has stable properties and is not easily decomposed, which is an important component of soil organic matter.
Chun TU +5 more
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通过5年田间定位试验,研究了不同玉米秸秆还田方式对黑钙土土壤团聚体含量、稳定性和团聚体有机碳贡献率的影响。结果表明:与秸秆不还田(CK)比较,秸秆还田处理能显著提高土壤大团聚体(>250 μm)含量、团聚体平均重量直径(MWD)和几何平均直径(GMD)(P2 000 ...
高洪军 +5 more
doaj
对无机粒子填充的PAn渗透蒸发支撑膜进行了初步的研究。考察了不同填充量和填充体系及拉伸热定型的后处理工艺对膜通量和粘弹性的影响。结果表明,不同填充量和填充体系对膜通量及粘弹性的影响不明显;而拉伸和热定型的后处理工艺条件对膜通量和粘弹性有较大的影响。随拉伸比的提高,膜通量迅速增大,膜的稳定性变好,具有很好的耐热性,而膜的截流率却几乎不变。此外 ...
周花, 崔永芳, 张志英, 葛继均
core
Study on homochirality on origin of life [PDF]
在生命起源问题上,最引人关注的两个问题是:基因密码子的起源和均一手性。密码子相当于一种代码,将一种氨基酸对应于一个或多个核苷酸三联体。现代密码子及其相应的载体L-shapedtRNA大约形成于10亿年前,到目前基本没有变化,而且被绝大多数生物体所采纳。关于基因密码子起源,立体化学假说认为,寡聚核苷酸和氨基酸之间通过立体化学相互作用形成了密码子关系,而共进论则认为:基因密码子的进化与氨基酸的生物进化密切相关;均一手性是指,组成蛋白质的氨基酸都是L型,而组成DNA和RNA,以及一些重要聚糖的单糖都是D型糖 ...
韩大雄
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Effect of Particle Agglomeration on Thermal Conductivity of Solar Salt Nanofluids [PDF]
ObjectivesNanofluid technology is an important means to improve the thermal conductivity of energy storage materials in solar thermal power plants. However, the nanoparticles in actual molten salt based nanofluid usually aggregate and settle down, which ...
CUI Liu +4 more
core +1 more source
为了揭示长期不同培肥措施下采煤塌陷区复垦土壤团聚体有机碳氮含量的变化规律,通过干筛法研究了不施肥(CK)、单施有机肥(M)、单施化肥(CF)、有机肥与化肥配施(MCF)、生物有机肥与化肥配施(MCFB)5种培肥措施下复垦4年和8年土壤各粒级团聚体分布组成特征以及各团聚体有机碳氮含量的变化规律。结果表明,复垦土壤团聚体含量随粒级减小呈先减小后增大的变化趋势,其中以3~2 mm粒级团聚体含量最低,占团聚体总量2%~3%,以2~1 mm粒级团聚体含量最高,占团聚体总量25%~31 ...
何冰 +6 more
doaj
Mudstone swelling characteristics and key interface response under water immersion [PDF]
The swelling of clay mineral-rich mudstones upon water exposure is a critical factor contributing to various geological hazards. However, there remains a lack of in-depth investigation into the microscopic and macroscopic response mechanisms of clay ...
Changdong LI +4 more
core +1 more source
为揭示不同粒径团聚体坡面溅蚀规律,以第四纪黏土发育红壤为研究对象,通过室内人工模拟降雨试验(雨强75 mm/h,历时45 min)研究<0.25,0.25~0.5,0.5~1,1~2,2~5 mm粒径团聚体溅蚀规律,系统分析了降雨条件下各粒径团聚体破碎、溅蚀率变化、溅蚀搬运量以及溅蚀搬运后的空间分布特征。结果表明:(1)降雨条件下团聚体粒径越大越容易破碎,除2~5 mm团聚体破碎量高达96.06%外,<2 mm团聚体破碎量均小于50.00%。(2)<0.25 mm团聚体溅蚀率具有陡涨陡落特点 ...
郝好鑫 +4 more
doaj
The Impact of Mixed Application of Modified Straw Biochar and Organic Fertilizer on Soil Water Retention and Fertility Maintenance in the Loess Hilly Dry Area [PDF]
[Objective] This study aimed to investigate the effects of different modified corn straw biochars on the water retention and fertilizer conservation capacity of arid loess soil and their effects on crop growth.
CHANG Fangling +5 more
core +1 more source
将粒径分别为1.5和25μm的堇青石粉体按一定比例球磨混匀,添加适当的粘结剂和造孔剂,经捏合、陈腐、挤出成型及烘坯处理后,程序升温至一定温度烧结2h制备膜支撑体。结果表明,细粉含量20%(质量分数)、1400℃烧结所得的支撑体综合性能较好:纯水通量为10.3m3/(m2·h);爆破压力为2.21MPa。其浸渍于5%(质量分数)NaOH中、置于100℃烘箱36h后,爆破压力仍为1.85MPa,表明其还具有良好的耐碱性能 ...
丁马太 +4 more
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