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1.
于1989~1992年,在大连黑石礁场,用不同浓度TA乳粉浸海带苗,可在其生长最关键时期充分发挥药效,提高其日生长量及制干率,从而提高产量。处理的海带厚度、宽度及色泽均优于对照,提高了等级率。海带中甘露醇、褐藻酸钠、碘、蛋白质、脂肪、糖、Vc含量的增加,提高了海带的药用、工业及营养价值,并能提前10d左右收获。用TA乳粉1×10-6(体积百分比浓度)处理12h及2×10-6处理2h是达到两高一优的最佳措施。  相似文献   

2.
电熔再结合镁铬砖的精炼渣浸实验研究   总被引:3,自引:1,他引:2  
用试样旋转法在1600℃下实验研究了CaO-SiO2-Al2O3-MgO-CaF2(3%)型精炼渣组成对电熔再结合镁铬砖的侵蚀影响,渣浸试样电镜分析的结果表明,随渣碱度(CaO/SiO2)的增大,试样的侵蚀增加;碱度大于1.8时,试样在冷却过程中粉化,由于尖晶石保护层的生成,渣中Al2O3含量的增加能减少侵蚀,随渣中MgO含量的增加,试样的侵蚀减少,在此基础上,讨论了对提高镁铬砖炉衬有利的炉外精炼  相似文献   

3.
棉花施用锌肥效果研究   总被引:6,自引:0,他引:6  
对锌肥在棉田施用效果进行了试验。试验结果表明:施锌肥处理小区比不施锌处理的对照区单株铃数增加1.2-2.2个,平均增产11.0%;单铃重增加7.7%;衣分增加2.6%,绒长增加2.0%;干物质增加5.5%;棉析体内、N、P、K含量增加0.8%-8.9%。可为合理施用锌肥提供依据。  相似文献   

4.
氮素形态及配比与大白菜体内硝酸盐的积累   总被引:1,自引:0,他引:1  
水培结果表明:氮素用量为210.6mg/l时,随NO3-N浓度的降低和NH4-N浓度的增加,地上干重显著降低,抑制体内硝酸盐、K、Mg、Cu的积累.有利于Fe、Zn的积累。随NO3-N浓度的降低和CO(NH2)2-N浓度的增加,地上干重有明显的单峰值,抑制体内硝酸盐、Mg、Mn的积累,有利于Fe的积累。在NO3-N:CO(NH2)-N为50:50(%)时,地上干重最大,并且硝酸盐含量符合绿色大白菜的基本规格。  相似文献   

5.
复合碱式氯化铝混凝剂的合成及其性能   总被引:2,自引:0,他引:2  
在盐酸直接酸浸铝矾土制碱式氯化铝的基础上,聚合一定量的Fe^3+和SO4^2-,合成复合型碱式氯化铝,其Al2O3含量为10.2% ̄10.8%,Fe2O3含量为2.8% ̄4.0%,盐基度含量为64% ̄75%,硫酸根的含量小于3.5%。红外光谱分析和电镜观察结果表明,该复合型碱式氯化铝是一种含多核聚铁及聚铝与氯离子及硫酸根配位的新型无机高分子混凝剂。  相似文献   

6.
γ-亚麻酸高产菌株的选育   总被引:1,自引:0,他引:1  
以从土壤中筛选得到的被孢霉菌为出发菌,用紫外线诱变处理,筛选γ-亚麻酸高产变异株,用摇瓶发酵选出其最佳培养基配方。原出发菌株细胞干重25.0g/L,油脂含量9.5g/L,γ-亚麻酸含量5.0%。选出的高产菌株在最佳条件下发酵,细胞干重50.2g/L,油脂含量21.8g/L,γ-亚麻酸含量8.5%。所得高产菌株具遗传稳定性。发酵油脂具优良特性,适用于保健食品及药品开发。  相似文献   

7.
在玉米一叶一心期,分别用自来水、2%NaCl、2%NaCl+20mg·L(-1)的S—3307、2%NaCl+30mg·L(-1)的S—3307进行处理,定期观察其形态变化并测定生理指标,结果表明,在盐胁迫条件下用S-3307处理后,其耐盐性有所提高.具体表现为:含水量提高,脯氨酸、丙二醛积累减少,膜透性变小,叶绿素含量增加,渗透压、呼吸强度及形态上均呈规律性变化.  相似文献   

8.
FeNi合金超细微粒的蒸发冷凝法制备及其微结构   总被引:7,自引:0,他引:7  
在N2气氛中,采用蒸发冷凝工艺制备了不同成份的FeNi合金超细微粒.合金超细微粒的平均粒径在一定的N2气压强范围内,随N2气压强增加而增大.当N2气压强大于某一值后,平均粒径随N2气压强增加呈减小趋势.在相同的N2气压强下,平均粒径随合金Ni含量减少而增大.用同一种原材料制备的不同平均粒径的合金超细微粒,其合金成份某本不变,但与原材料相比,超细微粒的Ni含量有所减少,Fe含量相应有所增加.合金超微粒的晶面间距随Ni含量变化而变化.Ni含量高的超细微粒为γ-fcc结构;Ni含量低的为α’-bee结构和γ-fcc结构二相并存.α’-bcc相随平均粒径减小明显增强.  相似文献   

9.
本文研究了海带经去腥、干燥、粉碎后与茶叶粉、风味剂等混合,制成复合海带保健茶的加工工艺。研究表明,海带经1%酵母在25-30℃下脱腥2h后,以海带粉100份、茶叶粉100份、风味剂2-3份(均为重量比)比例充分掺和而制成的保健茶,其成品风味独特,口味纯正,含有丰富的氨基酸、维生素、微量元素  相似文献   

10.
大红枣试管苗生根及移栽的研究   总被引:6,自引:0,他引:6  
大红枣无根试管苗在不同种类,不同浓度生长素以及在两种生长素不同配比的综合作用下生根的数量和质量不同。IBA和NAA的生根效应相同,合适的浓度均为0.4×10-6。IBA0.2×10-6+NAA0.2×10-6能够有效地提高生根质量。IBA0.2×10-6浸泡移栽基质和IBA500×10-6蘸根15~20min两种扦插方法都能促进生根成活。在选择试管苗的移栽基质方面,以森林腐殖土∶砂=3∶1(体积比)或锯沫效果较好  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

17.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

18.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

19.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

20.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

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