矿井瞬变电磁法感应探头的研制及其应用

瞬变电磁法已成为电法勘探的一种重要手段,但矿井井下瞬变电磁探测系统由于需符合煤矿井下防爆的要求,其发射功率受到限制;由于井下空间条件的限制,其发射线圈面积较小,因此煤矿井下瞬变电磁法探测系统接收到的二次场信号十分微弱。针对此问题,文中首先对煤矿井下噪声的特点进了分析,在后期数据处理时,可采用正负脉冲关断响应累加、周期响应叠加等方法降低噪声的影响,但这些方法仍无法克服发射电流小导致接收信号十分微弱的不足;其次采用高磁导率磁芯和宽频低噪放大技术研制出可适用于井下电法勘探的感应探头,该感应探头具有对二次场信号增强的作用,并采法拉第屏蔽技术对感应探头进行了屏蔽处理,进一步降低了噪声的影响。标定与对比试验证明:研制出的磁感应探头具有灵敏度高、抗噪性能好等优点。最后将研制的磁探头应用在王庄煤矿的南翼大巷超前探测中,勘探到了3处异常区域,并得到了钻探验证,勘探结果说明,研制的磁探头能满足煤矿井下瞬变电磁法勘探的要求。     

脉冲中子、伽马探测系统性能表征与设计技术

探测系统是获取辐射场特征信息的核心器件，是实施脉冲辐射探测的关键和技术基础，其性能直接决定测试数据的质量和测试方法的选择。对影响脉冲辐射探测的性能指标进行系统描述、表征是探测系统设计、研制、实际应用和综合性能评价的基础。用于复杂能谱脉冲中子、伽马混合辐射场时间谱、强度谱测量的探测系统，主要性能包括探测灵敏度、时间响应、能量响应、线性电流和中子、伽马分辨能力等指标参数，这些参数的获得与实现，需要根据中子、伽马射线与物质相互作用的基本原理，构建相应的探测结构和技术原理。在设计上，综合权衡能量收集和电荷收集方式选择、几何效率完备和高信噪比结合、信号响应和直照响应分离、探测效率与时间特性兼顾、综合性能与使用可靠性一致等设计原则，综合应用这些原则构成了探测系统设计方法。     

基于Labview的核磁共振磁场测量仪的研究

核磁共振方法测量磁场是较精确的一种测量磁场的方法,由于在低磁场强度时共振信号相对于噪声很弱,给正确测出磁场造成困难.计算机虚拟仪器技术是先进的计算机测控技术,与核磁共振探头结合起来组成虚拟磁场测量仪,利用虚拟仪器软件Labview的强大功能,可以有效消除噪声的影响,并且结构简单实用.     

基于TDLAS的光学探针式初期火灾探测系统

为了实现火灾初期探测，设计了光学探针式初期火灾探测系统。该探测系统基于可调谐二极管激光吸收光谱(TDLAS)技术与激光遥测技术，采用波长为2.33μm的激光光源与波长调制光谱(WMS)技术，利用激光作为光学探针替代传统吸收测量腔室，实现了火灾初期基于CO路径积分体积分数的开放光路探测。系统对10m内的反射面实现了不低于20 (μL/L)·m的检测限。国标木材热解火实验表明，该文研制的系统与提出的阈值报警算法具备实现初期火灾报警响应的能力。     

核磁共振地下水探测系统信号源的研制

为模拟产生MRS(Magnetic Resonance Sounding)信号研制JLMRS地下水探测系统,设计了核磁共振信号源,模拟MRS信号,方便JLMRS地下水探测系统室内测试.针对实际MRS信号幅度小,频率分辨率高等特点,信号源硬件采用DDS(Direct Digital Synthesizer)技术,CPLD...     

井下采区无人值守变电所综合自动化系统设计

开发了一种基于数字信号处理器与控制器局域网络总线的井下采区变电所无人值守综合自动化系统,实现了采区变电站的无人值守。系统由监控中心、通信接口和智能测控保护单元组成。重点研究了智能测控保护单元部分软硬件设计和测控保护算法;针对井下采区变电站的实际应用环境,设计了适合井下供电系统的测控部分模拟量交流采样算法和微机保护算法,以提高测量精度,实现及时有效的保护。     

单站电离层探测系统上位机集成软件的设计

提出了单站电离层探测系统上位机集成软件系统的一种设计方案.针对探测系统多功能化、硬件升级和算法发展导致需求不断变更的特点,采用3层的层次体系结构,设计了探测系统的硬件控制模块;采用面向对象的软件体系,设计了信息处理模块.利用Matlab的计算与显示功能,实现了人机交互、硬件控制、探测管理、数据处理,数据存储和可视化的需求.采用多线程技术解决系统实时性问题,使通用计算机具有了控制器、终端显示器和数据处理机的功能.本软件具有体系结构稳定、代码复用率高、易于升级和功能扩展等优点,可满足实际探测需求.     

双波段红外可燃气体探测系统优化模型设计与分析

对于适用于大空间、开放环境条件下的高灵敏度可燃气体探测系统,必须消除大气气象条件和大气组分的随机变化对系统可燃气体准确探测的影响.在AUBE'99论文IR Beam Gas Detection System中阐述了双波段红外可燃气体探测系统的探测原理和标定方法.本文在充分分析了双波段探测原理本质的基础上,明确提出了双波段选择的3项原则;提出了系统实现的设计指导方针;并设计了系统模型和系统调节方法,导出基于该模型的可燃气体测量数据处理的数学模型,并论证了该系统模型使探测系统既具有最灵活的应用,又具有最稳定的探测性能,是双波段红外可燃气体探测系统的优化模型.     

海洋环境监测中的光纤化学／生物传感技术

通过光纤溶解氧、pH、湿度等化学传感探头及发光菌水质毒性监测生物传感探头的研制,开发出了一类能用于环境监测的新型传感器。其创新之处在于传感探头的设计与包装,以及数种可逆性、选择性、稳定性、使用寿命、响应时间、灵敏度等响应特性具佳的化学及生物传感膜的配方和制作技术。利用这些技术,通过对光纤探头的设计与包装,可以实现在现场及实验室模拟条件下对样品的选择性检测。研制的传感器能广泛应用于海洋污染调查、内河水质评价、水产养殖、工矿企业水气排污自检等诸多方面。     

静电探测系统的研究

对利用带电目标自身所产生的静电场来获取目标信息并进行目标探测的被动式静电探测系统(包括探头、放大电路、滤波电路、进入采集芯片前的信号调理电路、抓频电路和RS232串口通讯电路等几个部分)进行了研究,并对探测系统的性能进行了实验分析,结果表明,所设计的电路能够满足预期的设计要求.     

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.     

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.     

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。     

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.     

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.