非水溶剂沥取法制取优质硫化钠

一、试剂乙醇沥取工业硫化钠法硫化钠又称硫化碱,俗名臭碱,是无色透明结晶。密度1.856克/厘米~3,熔点1180℃,在水溶液中的生成热⊿H°_(f298)=52.0千卡/克分子。其固相生成热⊿H°_(f298)=44.2千卡/克分子。在水中的溶解度如下表:     

光照后对二甲胺基肉桂醛苯腙的热效应及动力学参数的测定

对二甲胺基肉桂醛苯腙(p-Dimethylamino Cinnamaldhyde Phenylhydrozone,以下简称DMGP)是一种黄色微粒结晶,受光照射后吸收光能(hv)变成灰至深褐色,去掉光源后又回复至黄色并有放热效应,具有可逆地使光转变成热的性能.我们期望这一性质能使它用来贮蓄太阳能.探究其热效应有多大、贮能时间有多久是很有意义的.为此对它进行了有关的物理化学性质的测定,获得了该化合物的主要热学数据(熔化热和反应热),并进一步对其动力学参数(活化能、反应级数)进行了测定,以估量其作为能量贮存材料的可能性.     

低发泡聚酯聚氨酯热性能的研究(Ⅰ)

用热重分析研究了本所研制的新型低发泡聚酯聚氨酯材料,测定出六种样品的热重数求据。其热降解温度T_d为265.8℃～285,4℃。用差减微分法对TG和DTG曲线进行了处理,得其第一和第二阶段热降解动力学参数。在热降解第一阶段反应,级数n为0.9～1.4;热降解表现活化能E为16.A～22.6千卡/克分子;频率因子A为8.4×10~3～8.9×10~(10)秒~(-1)。用热重动力学数据快速评价了这类聚酯聚氨酯的热稳定性并讨论了影响TG结果的因素。     

常压空气氧化再生三氯化铁

在一个钛质搅拌器的充气装置中,进行了二氯化铁溶液常压空气氧化再生三氯化铁的研究。试验结果表明:Fe~(2 )浓度、Cu~(2 )浓度、温度、搅拌速度对氧化率有显著的影响,而酸度和氯化钠浓度的影响较小。含 Fe~(2 )54.45克/升、Cu~(2 )10克/升的溶液,在温度80℃、搅拌速度2000转/分、氧化2小时,其氧化率为70.58%,Fe~(2 )的平均氧化速度为19.06克/升·时。含Fe~(2 )146.52克/升、Cu~(2 )10克/升的溶液,在温度80℃、搅拌速度2200转/分、氧化2小时,氧化率为57.73%,Fe~(2 )的平均氧化速度为42.3克/升·时。温度80—50℃时,活化能为1.32千卡/摩尔;50—40℃时为6.06千卡/摩尔。常压空气氧化再生三氯化铁的方法比较简单,而且可使浸出过程和再生过程结合在一起,因而有可能降低浸出剂的用量。     

104种竹(木)材燃烧热的测定

<正>这篇沦文包括三个部分:样品的采集和处理,测定方法;测定结果。 1.毛竹不同器官的燃烧热量是不同的,但是,竹子的年龄对燃烧热量是没有影响的。毛竹不同器官的燃烧热量为;竹秆4532卡/克,枝条4719卡/克,叶片4203卡/克,鞭和根4286卡/克。 2.不同属种的燃烧热量是不同的:刚竹属4680卡/克,(竹剌)竹属4543卡/克,慈竹属4554卡/克,单竹属4612卡/克,大节竹属4640卡/克,唐竹属4595卡/克,青篱竹属4671卡/克,(竹思)(竹劳)竹属4478卡/克,方竹属4457卡/克,梨竹属4562卡/克。 3.竹子产地对竹材燃烧热量是有影响的,一般来说,竹子生长在高纬度比生长在低纬度含有较多的热量。 4.61种竹材的平均燃烧热量是4603卡/克,43种木材的平均燃烧热量是4776卡/克,其中针叶树种是4949卡/克,阔叶树种是4750卡/克。     

自悬浮定向流法制备纳米铝粉的DSC-TG和XPS分析

采用自悬浮定向流法制备金属纳米Al粉.用差示扫描量热-热重法(DSC-TG)和X射线光电子能谱(XPS)分析对其热性能进行研究.研究结果表明:在Ar气流中,新纳米铝粉的熔点为649.7℃,熔化焓为3.7kJ/mol,分别比粗晶铝的熔点(660℃)和熔化焓(10.79kJ/mol)低10.3℃和7.09 kJ/mol;在N2气流中,从20℃升温到800℃时,新纳米铝粉增重约为33%,熔点为648.8℃.在704℃开始有一个放热效应,终点为747.7℃,放热过程的焓为36.4 kJ/mol:在Ar气流中进行热分析前后的新纳米铝粉中未发现Ar元素存在;而在N2气流中进行热分析后的新纳米铝粉残余物中发现有N元素存在,样品表面Al,N和O原子的摩尔比为32.78:11.98:55.24.     

非晶态Ni-P合金粉体的脉冲放电制备及其催化性能

采用脉冲放电技术合成Ni-P合金粉体,研究了合金粉体的结构及其对高氯酸铵热分解的影响. 结果表明,非晶态Ni-P合金粉体是由微粒组成的团聚结构. 脉冲放电电压700、900和1100V对应的弦粒子数依次增大,粉体粒径依次减小,分别为350～500、250～400和150～300nm. Ni- -P合金粉体促进高氯酸铵的低温和高温热分解,与纯高氯酸铵相比,高氯酸铵和Ni- -P粉体混合物的第1放热峰(低温分解峰)温度降低幅度小于12℃,第2放热峰(高温分解峰)温度降低约53℃;合金粉体粒径减小,第1放热峰强度增强,第2放热峰强度减弱,低温分解失重从高氯酸铵的15.97%增加到42.78%,高温分解失重从81.62%降低到47.58%,高温分解结束时温度的降低幅度为26～43℃.     

低发泡聚酯聚氨酯动态力学性能的研究

测试了六种新型低发泡聚酯聚氨酯样品的动态力学性能.发现内耗温度曲线在—10℃和—100℃左右均有α和γ指纹吸收峰.α转变的tanδ值在0.355到0.565范围,α转变的表观活化能为38.08～55.49千卡/克分子;γ转变的表观活化能为10.18～23.83千卡/克分子.六种样品的动态模量E在—37℃～30℃的范围内均急剧下降约二个数量级至1.5×10~8达因/厘米~2左右随后进入"橡胶平台区".观察到了尚未见报导过的"多阶橡胶平台"现象.     

反应热喷涂法制备陶瓷涂层的研究

首先通过差热-失重分析和XRD测试手段对反应热喷涂Al+TiO2+H3BO3混合粉体以制备Al2O3/TiB2复合陶瓷涂层的可行性进行了分析.然后对喷涂后试样涂层的耐磨性进行了研究.结果表明:Al+TiO2+H3BO3混合粉体差热-失重分析和在1200℃烧结后XRD测试分析均表明完全可以反应生成所需的Al2O3/TiB...     

石墨纤维热电偶的性能测试与分析

目前在高温测量中常用的仪器为铂铑热电偶,但它只能测量2000℃以下温度,高温下耐腐蚀性差,资源短缺,成本高.本实验使用石墨纤维代替传统的金属材料作为热电极材料,测试其线性度和复现性等指标,以期获得新的热电偶.     

Markedness and its Interpretation in Language Use

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

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.     

Features of Women's language

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.     

Design and analysis of generic LBS application developing platform

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

低渗透非均质砂岩油藏启动压力梯度研究

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.