无碳的

Cathodoluminescence and δ〓O、δ〓C values of the sparites of geopetal structures within fossil brachiopods indicate that the sparcalcites were formed in equilibrium with various stages of postdepositional digenesis or catagenesis with each stage's δ〓O of interstitial water different.

3碳酸盐岩早期成岩胶结物或孔洞充填中的亮晶方解石是除腕足化石外获取碳酸盐岩原始氧、碳同位素组成的又一种常用样品。但本论文研究发现，龙门山地区碳酸盐岩的成岩后生改造具有多期多次现象，不同改造期次的流体之间存在明显的δ〓O差异，但无明显的δ〓C差别。

The experiment study about the subcritical normalizing holding temperature effects the macrostructure and hardness of the 40SiMnCrNiMoA steel shows: When subcritical normalizing holding temperature is 760℃, the ferrite in the mixture phase structure is lumpish, the hardness of the steel is low (about HRC32), and when the holding temperature is over 800℃, the hardness of the steel is about HRC49, the ferrite in the mixture phase structure is in old critical range austenite grain boundaries, it is disadvantage for the steel strengthening. When the holding temperature is 780℃, the mixture phase structure is mixture phase structure including the strip ferrite、martensite and bainite, the ferrite is less than 20%wt, its grains are fine and even, the hardness of the steel is about HRC38, it is in the range of HRC35-40 which is the long-life drill rod needed.

亚温正火温度对40SiMnCrNiMoA的组织和硬度等性能的影响的实验研究表明，当亚温正火保温温度为760℃时，复合组织中的铁素体形态是块状，处理后的材料硬度相对较低（HRC32左右）；而当采用大于800℃温度亚温正火处理，材料硬度为HRC49左右，组织中铁素体大部分较连续地存在于原奥氏体的晶界，对材料强化不利；当40SiMnCrNiMoA钢780℃亚温正火后，硬度为HRC38左右，在以往小钎杆较长寿命所需硬度范围HRC35-40内，而组织为细条状铁素体+以板条马氏体和条状无碳贝氏体为主的复合组织，晶粒细小均匀，铁素体体积含量少于20％。

Major gas carburizing for steel parts used, the use of ultra-lining and the international advanced energy-saving vacuum sealed fan, the furnace pressure to increase without any leakage, temperature uniformity, warming fast, insulation, and an atmosphere of carbon potential uniform workpiece carburizing speed, uniform layer, the seriesPit Gas Carburizing Furnace greatly improved the productivity and quality of carburization.

主要供钢制零件气体渗碳用，由于采用超节能炉衬和国际先进的真空密封风机，使炉压提高，无任何漏气，炉温均匀，升温快，保温好，碳势气氛均匀，工件渗碳速度加快，渗层均匀，本系列井式气体渗碳电炉大大提高了生产效率和渗碳质量。

Major gas carburizing for steel parts used, the use of ultra-lining and the international advanced energy-saving vacuum sealed fan, the furnace pressure to increase without any leakage, temperature uniformity, warming fast, insulation, and an atmosphere of carbon potential uniform workpiece carburizing

主要供钢制零件气体渗碳用，由于采用超节能炉衬和国际先进的真空密封风机，使炉压提高，无任何漏气，炉温均匀、升温快、保温好，碳势气氛均匀，工件渗碳速度加快，渗层均匀，本系列井式气体渗碳电炉大大提高了生产效率和渗碳质量。

Major gas carburizing for steel parts used,the use ultra-l-ining and the international advanced energy-saving vacuum sealed fan,the furnace pressure to increase without any le-akage,temperature uniformity,warming fast,insulation good,and an atmosphere of carbon potential uniform seepage work-piece carbon

主要供钢制零件气体渗碳用，由于采用超节能炉衬和国际先进的真空密封风机，使炉压提高，无任何漏气，炉温均匀、升温快、保温好，碳势气氛均匀，工件渗碳速度加快，渗层均匀，本系列井式气体渗碳电炉大大提高了生产效率和渗碳质量。

A modified homogeneous flow model was introduced to calculate the flow field in RH degasser,thus getting rid of some earlier methods that are unavailable to be generalized,such as reducing the computation region or presetting the distribution of gas volume fraction.

分别对有、无旋转磁场作用时的RH系统进行了模拟计算。模拟结果表明：流场和脱碳过程与现有文献中实验结果相符合；当旋转磁场作用后，磁感应强度为0.04 T时，初期脱碳速度比无旋流作用时增加了约15%，这是由于旋流增加了系统的搅拌能，提高了脱碳反应速率。

This paper confirmed that the microcapsule from sodium alginate and which is used in carbonless copy paper by single cogulation process owns higher embedding ratio and better nonpermeability stableness and strength.

本文对以海藻酸钠为壁材、以结晶紫内酯的邻苯二甲酸二丁酯溶液为芯材通过单凝聚法制备无碳复写纸用微囊的工艺条件进行了研究，制定了工艺路线和流程，确定了最佳的乳化条件、絮凝条件、固化条件以及壁材浓度、芯壁比，并对成品微囊进行了应用性的对比分析。

No evident regularity was found in the depth from 15 to 30 cm. There was an obvious accumulation of OM and TN in the top 30 cm of the fallowed soils, of which the accumulation of OM was faster than that of TN and there was more accumulation in no-tillage compared to tillage. Soils applied with inorganic and organic fertilizers had much more OM and TN at 0～5 cm and 5～15 cm depth than soils applied with only inorganic fertilizers and soils without fertilization. However, OM and TN in these treatments were less than that in fallow treatment. No significant differences in OM and TN contents were found between fertilization treatments. Only in the 5 cm of top soils, OM and TN of the soils treated with only inorganic fertilizers were more than that of CK.

长期休闲的土壤在整个耕层有明显的有机质和氮素累积，其中碳的累积快于氮的累积，免耕条件下比耕翻条件下累积量更大。0～5 cm和5～15 cm土层有机肥与无机肥配施的处理，其有机质和全氮质量分数均显著高于单施化肥处理和不施肥处理，但均低于休闲处理；15～30 cm土层各培肥处理则无明显差异；单施化肥的土壤有机质和全氮质量分数高于不施肥处理，但这种差异只在表层（0～5 cm）较显著。

In contrast, Al2TiO5 can not be synthesized at low temperatures using methanol or tert-butyl alcohol as oxygen donor due to their high chemical reactivity resulting in hydrolysis reaction.

以TiCl4和无水AlCl3为原料，以无水低碳醇为氧供体通过非水解溶胶-凝胶法低温合成了钛酸铝，研究了无水低碳醇种类及用量对钛酸铝合成反应的影响。

Objective To investigate the effect and side-effect of mifepristone in small doses comparing C53contraceptive in postcoital contraception.Methods 142women with normal menstruation were divided into two groups randomly.Observation group（n=66）were given mifepristone10mg and C53contraceptive5mg within72hours after unprotected intercourse or contraception failure.Control group（n=76）were given mifepristone with a sin-gle dose of10mg within72hours after unprotected intercourse or contraception failure.The effect side-effect and menstruation of the two group were compared.

目的 探讨低剂量米非司酮配伍双炔失碳酯应用于紧急避孕的效果方法将142例月经规律的合格妇女随机分 2组，观察组（66例）在避孕失败或无保护性性交后72h内开始服用米非司酮10mg+双炔失碳酯5mg，对照组（76例）在避孕失败或无保护性性交后72h内开始服用单剂量米非司酮10mg，观察两组避孕效果、不良反应及月经情况。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。