冲击电充计与灵敏电流计的特性分析与测定

用角析方法分析了测量微弱脉冲电量与微弱电流的冲击电流计与灵敏电流的工作状态，给出了运动特性曲线，揭示了状态参量的物理本质。计算与测定了临界冲击常数Ｋｂ与无阻尼状态下冲击常数ｋａ之间的关系。     

利用冲击电流计测量水磁导率的研究

介绍了利用冲击电流计测量磁介质磁导率的方法，重点介绍了利用冲击电流计测量水的相对磁导率，并且研究了水从－１５℃到１００℃的相对磁导率。     

对灵敏电流计特性研究实验的教学探索

灵敏电流计是一种磁电式电流计,它的灵敏度特别高,可以用来检测闭合回路中的微弱电流(10-6～10-10A)或微弱电压(10-3～10-6V)。利用其自己高灵敏度的特点,在光电流检测,平衡电桥,电位差计等实验中,被广泛使用,但是针对《灵敏电流计特性研究》实验过程中存在的疑难点,从灵敏电流计的结构特点出发,补充强调了电流计为什么比普通的电流计更加精确,它的优点主要体现在哪里,灵敏电流计的三个特性对完成整个实验的意义。从电路出发,说明如何控制线圈的运动状态。最后,为了让学生正确使用电流计,介绍灵敏电流计的分流器结构。     

灵敏电流计内阻和电流计常数的测量探讨

通过实验,用三种电路对灵敏电流计内阻和电流计常数进行测定,并作出了结果分析.     

冲击电流计特性研究

一些教科书在研究冲击电流计特性时,认为当通过冲击电流计的电量Q不变时,电量冲击灵敏度S_Q=φ_m/Q随阻尼度减小而增大,因此,测量中应以力求得到高的电量冲击灵敏度作为选择冲击电流计工作状态的原则.笔者认为这一论点值得商榷. 在实际测量中,例如测磁通变化量△ψ时,若按此原则,那么,应选欠阻尼状态,但这时偏转量减小,即测量灵敏度(磁通灵敏度)反而降低,在改变阻尼度寻求较大偏转量的过程中,不同阻尼度通过冲击电流计的电量Q值不同.对欠阻尼,因回路电阻增大,脉冲电流减小,通过的电量Q减少,冲掷角φ_m也减小.尽管此时电量冲击灵敏度(S_Q=φ_m/Q与Q无关与入有关)较高,但测量灵敏度(S_ψ=φ_m/△ψ)反而较低.因此不能以力求得到高的电量冲     

对《灵敏电流计特性研究》实验指导的探讨

针对《灵敏电流计特性研究》实验中存在的疑难点，从灵敏电流计的结构特点出发，补充强调了电流计与一般的指针磁电式电表的主要区别之一是其活动部分没有产生电磁阻尼矩的铝制框架，电磁阻尼矩只能由动圈和外电路闭合后产生；并补充说明了为什么对电流计机械调零时应使外电阻等于电流计的临界电阻．为了让学生正确使用电流计，介绍了电流计的分流器结构．最后强调说明了应使电流计工作在甚过阻尼状态下，才能精确测量其内阻．     

异步电动机专用电流计

针对异步电动机电流计存在的耐起动电流冲击和指示正常运行电流之间的矛盾，试制了一种新型的异步电动机专用电流计，经测试完全满足工程要求.     

冲击电流计特性研究的两种方法

由电磁测量中不同的前提条件,对闭路状态中冲击电流计的运动特性进行了两种不同方法的分析研究,从而提出其中一种对实际电磁测量有指导价值的结论．     

关于墙式冲击电流计的改进

<正> 冲击电流计是高等院校和科研单位物理实验室内,电磁测量方面必备的基本仪器。墙式冲击电流计是五十年代的产品,现在许多单位还有一定的数量。由于这种冲击电流计在结构上存在着一些问题,导致了对它的利用率较低。为了节省国家开支,使这批仪器发挥更多的作用,将这种冲击电流计作了一些改进,改进后的冲击电流计,经过两个学期的使用,证明     

待测电阻与标准电阻的阻值差异对冲击电流计测量电阻误差的影响

通过实验分析用冲击电流计测量电阻时误差与标准电阻与待测电阻阻值差异对冲击电流计测量电阻误差的影响，发现标准电阻与待测电阻阻值相差不大时，冲击电流计测量电阻误差就小，反之就大。     

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.     

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.     

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.     

On Tragic Consciousness In The Works By Ernest Hemingway

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.     

A computer generator for randomly layered structures

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