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1.
通过模拟集成电路高温工艺的1200℃,1.5h后急冷热处理,研究了硅中氧、氮、磷3种杂质对硅片高温工艺过程中塑性形变的影响.实验结果表明,普通氩气氛下直拉单晶硅(ACZSi)高温弯曲度变化只是含氧很少的区熔硅(FZSi)的1/3左右.在含氮气氛下直拉硅(NCZSi)中,氮含量为4.5×1015cm-3的单晶尾部高温热处理弯曲度约是氮含量很小的单晶头部的1/3,重掺磷硅片热处理形变比普通硅片大得多.  相似文献   

2.
对电解工艺与Ni粉粒度和粒度组成的关系作了研究。结果表明:ρNi2+为3g/L时,粒度小于10.8μm的粉末可高达99.3%;电流密度为1500A/m2时,粒度为2.7~8.1μm的粉末占全部粉末的80%;随着(NH4)2SO4含量增大,Ni粉粒度变粗;电解液温度以40~50℃为佳;每次刷粉时间以20~30min为宜.  相似文献   

3.
研究了2种类型的乙烯气相聚合高活性催花剂.用SiO2,MgCl2作复合载体,负载TiCl4制得的SM型催化剂,载体中含w(Ti)为2%~3%,w(Ti3+)为35%~59%,比表面积105~120m2/g,催化活性每小时每克催化剂Ti催化得5.0~5.7kg产物PE(kg·g-1·h-1),聚合动力学曲线为衰减型.用镁粉、卤代烷、四氯化钛为主要组分制备的MG-2型催化剂,载体中w(Ti)为6%~7%,w(Ti3+)为55%~69%,比表面积70~85m2/g,催化活性1.8~2.0kg·g-1·h-1,聚合动力学曲线为平稳型.对SM型催化剂扫描电镜及图象分析得到颗粒平均粒径(d),颗粒长短轴比(dl/ds)及颗粒大小粒径比(dmax/dmin)分别为31μm,1.402,4.1,MG-2型催化剂为33μm,1.524,7.0,相应聚合产物颗粒的d,dl/ds,dmax/dmin,SM型催化剂为247μm,1.295,4.6,MG-2型催化剂为263μm,1.540,9.0.显示出SM催化剂更优良的聚合性能.  相似文献   

4.
水镁石纤维是天然产出的、罕见的高镁实心纤维。其抗拉强度为95×9.81×10 ̄6Pa,弹性模量为1.5~2.0×9.8×10 ̄9pa,显微硬度为70~240,密度为2.44~2.48g/cm ̄3。电阻率为3×10 ̄5Ω.m~6.1×10 ̄7Ω.m,介电常数为4.7~7.2,磁化系数为11.5~15.5cm ̄3/g。耐热区间为450~480℃,导热系数为0.131w/m·k,热膨胀系数为5.7~8.8×10 ̄(-7)m/℃,热容为1.26I/g,热解焓为19.6KJ/mol。Ne=1.575~1.577,No=1.552~1.556,白度73.5%。本文还讨论了上述物理性质的各种变化、影响因素及其应用。  相似文献   

5.
利用葡萄糖和果糖与 2,4二硝基酚在强碱性介质中反应生成红色化合物的反应速度差,建立了光度法同时测定葡萄糖和果糖的速差动力学法.当 Na O H 浓度为 16×10- 3 m ol/ L,2,4二硝基酚浓度为 12×10- 3 m ol/ L,分别在 50℃下反应 8m in 和 55℃下反应 6 m in 时,同时测定葡萄糖的线性范围为 0~960×10- 3 m ol/ L,果糖的线性范围为0~200×10- 3 m ol/ L.对葡萄糖与果糖浓度比为15∶1~1∶1 的混合液进行回收试验,回收率为963% ~1053% .该方法已用于果葡糖浆的分析  相似文献   

6.
报道一种新颖的激光开槽、埋槽电极硅太阳电池的结构、工艺流程及其研制结果。在AM1.5,25℃,100mW/cm2的条件下,以面积为45cm3的36片硅片研制的硅太阳电池的输出参数的平均值为JSC=36.1mA/cm2,V∞=633mV,F.F.=0.798,η=18.23%,最后分析了种高性能硅太阳电池的设计特点。  相似文献   

7.
非均匀结构WC-Co硬质合金   总被引:1,自引:0,他引:1  
对采用碳化烧结法制取非均匀结构硬质合金的工艺进行了研究,结果表明,碳化烧结工艺可制得非均匀结构WC-Co硬质合金,配C量以6.0%~6.1%(质量分数)较好,最佳烧结温度为1420~1450℃,WC-10%Co(质量分数)合金的抗弯强度σbb可达2600~2900MPa,密度ρ为14.4~14.6g/cm3,硬度HRA为88.2~89.9.此外,还可以获得WC<lμm的合金。  相似文献   

8.
根据我所西轩试验场五年(1991~1995)的室内大规格鲍苗培育观察,对1991年度和1992年度0.7~3.0cm鲍苗生长情况进行了比较。在自然水温条件下,鲍苗以4~6月和10~12月生长最快,5月份平均最高日增长达200mm,2~3月低温期和7~8月高温期生长迟缓。本文还通过对单位体重鲍苗耗氧量的计算,提出了鲍苗的理论培育密度,1cm鲍苗培育密度为5000颗/m2,2.0cm鲍苗为1100颗/m2,3.0cm鲍苗为400颗/m2。  相似文献   

9.
新显色剂间溴偶氮羧-m与镓的显色反应及其应用研究   总被引:1,自引:0,他引:1  
本文作者研究了应用新显色剂间溴偶氮羧—m在水相中测定微量镓的方法.镓与显色剂形成1:2的蓝色配合物.λmax为682nm.在HC1—KCl介质中,pH2.3~3.2范围内,摩尔吸光系数可达1.32×105L/(mol·cm).最佳显色条件下,镓的含量在0~7μg/25ml范围内符合比耳定律.  相似文献   

10.
自动投影光刻中的暗场对准技术   总被引:1,自引:0,他引:1  
暗场对准技术是利用光学暗场成像原理和微光真空光电探测技术,使投影光刻硅片上的标记获得大幅值、高信噪比的对准信号通过双池偏差优化软件,借助计算机进行采样控制和数据处理,从而获得很高的对准精度。对多种不同工艺硅片上的标记进行对准试验,精度达0.2μm(3σ)。该技术精度高,对硅片光刻工艺的适应性广,可用于大规模集成电路生产硅片光刻时的实际对准工作,使我国的投影光刻技术进入1μm特性线宽的实用阶段。  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.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
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   

16.
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   

17.
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   

18.
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   

19.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

20.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

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