High Power Fiber Bundle Array Coupled LDA Module

1 Introduction High power laser diode arrays (LDA) have many advan- tages such as small volume, long working life, high slope efficiency and high optical density, so they have many applications in medical treatment, material pro- cessing, and for the pumping source of solid laser and etc. But unfortunately, the LDA can not be easy to use directly in these fields because of their poor beam quality and extremely asymmetric divergent beams (!x≈ 5°～10°and !y≈20°～35°, for example), so it …     

Development of Fiber Lasers and Their Applications

1 Introduction Fiber lasers have been developed for more than forty years since Snitzer!s proposal and the demonstration of Nd- doped fiber in 1961 [1]. But fiber lasers have not been attracted considerable attention until the develop- ment of the low- loss fiber fabrication technology and the high power semiconductor laser technology recently. Actually,it is the application and development of fiber communication technology that has promoted the rapid development of fiber laser. Fiber laser, …     

Web日本语虚拟教师4维导学模型的研究与实现

信息技术在教育领域中的应用,为学生的个性化学习提供了可能,打破了学习内容、进度、起点、目标、要求等的统一性。该研究的目的是探索一种具有一定模拟实际教师部分机能的日本语虚拟教师导学模型。研究方法是通过计算机模拟技术及智能数学模型对实际日本语教师的导学功能进行近似仿真表达。该研究已完成该Web日本语虚拟教师一对一因材施教和因需施教为学员制定学习方案的4维导学功能模型。利用该模型可以模拟真实日本语教师导学功能,完成对任意基础和任意学习目标的日本语学员制定个性化学习方案。     

ADSORPTION OF GALLIUM WITH N_503LEVEXTREL RESIN

ＡＤＳＯＲＰＴＩＯＮＯＦＧＡＬＬＩＵＭＷＩＴＨＮ＿５０３ＬＥＶＥＸＴＲＥＬＲＥＳＩＮＣｈｅｎ，Ｊｉａｎｒｏｎｇ；Ｈｕ，Ｊｉａｎｈｕａ；Ｐｅｎｇ，Ｃｈａｏｑｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＺｈｅｊｉａｎｇＮｏｒｍａｌＵｎｉｖｅｒｓｉｔ...     

无人系统多模态视觉感知单元测试与评估方法的研究

提出一种通用的基于视觉传感器的无人系统多模态视觉感知平台的测试与评估的方法,研究了可见光波段和红外光波段下的动态测距实验与复杂光变测距实验. 整个过程采用基于北斗卫星实时授时的时间同步技术和真值采集设备,输出带有时间戳的无人系统多模态感知单元的测量数据和真值数据,并保证了不同设备之间的时间同步误差小于10 ms. 最后,对比测量数据和真值数据,给出测试设备的性能与功能的量化评估. 实验结果表明,该测试评估方法有效地获取了真值,并进行了时间同步,满足实际的需求,具备推广性.     

胍基阳离子捕收剂反浮选磷矿的性能与机理分析

为了研究磷矿反浮脱硅过程中,胍基阳离子磷矿捕收剂的作用机理,以N-椰油基-1,3-丙撑二胺、单氰胺、乙酸为原料制得一种阳离子表面活性剂,并用于傅里叶红外光谱仪表征,测试了该药剂与3种矿物作用前后的接触角、Zeta电位、红外光谱,进行了石英、白云石、胶磷矿的纯矿物浮选试验等。结果表明:该合成药剂属胍基阳离子表面活性剂,在广泛pH值范围内,对石英的捕收能力较强,对白云石次之,对胶磷矿较弱;在弱碱性下,对白云石捕收性能有所提高;相较白云石、胶磷矿,该药剂更易与石英产生吸附作用,使矿物表面呈现疏水性;接触角、Zeta电位、红外光谱测试结果说明与3种矿物的吸附主要是物理吸附。试验结果说明该胍基阳离子表面活性剂可以作为磷矿反浮脱硅捕收剂。     

Similarity identification method on formational interfaces and application in general granite

An instrumented drilling system can be applied for the acquisition of drilling process parameters.The system can provide continuous and huge data for geotechnical engineering.However, due to the complexity of ground strata, the variation in the drilling parameters with stratigraphical characteristics is great and the correlation between likely comparable parameters is not high, which limits the use of conventional correlation approaches in this field.How to use the data for engineering and how to get a reasonable interpretation for the relationships among the drilling parameters, as well as between a drilling parameter and formational character-istics, become a technical choke point for the development and application of the instrumented drilling system.Based on similarity criteria, the extraction of sample data and characteristics, the pretreatment of data and feature matching algorithms have been ana-lyzed and an approach of slope coefficient searching identification has been established.A case study was carried out for the similar-ity between the rotational speed of the drill bit, flushing pressure, and effective thrust force graphics in general weathered granite.The result shows that the similarity coefficients between the rotational speed of the drill bit, flushing pressure, and effective thrust force are 0.72 and 0.83, respectively.Although there are differences between the distances of the graphics, the curves of both rota- tional speed and flushing pressure agree with the effective thrust curve in shape, which provides a possible method for the identifica- tion of various formations by use of the similarity between feature drilling parameters.     

Relationship between the microstructure and reaction performance of aluminosilicate

A systematic study was conducted to comprehend the mechanism of thermal activation of silica-alumina materials by using 29 Si and 27 Al magnetic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy.The reaction performance of silica-alumina-based materials with different molar ratios of Si/Al,which were thermally activated,was also investigated.With the increase in calcining temperature,the coordination of Al in metakaolin becomes four,five,and six firstly,and then transforms completely to four ...     

压裂泵液力端阀箱内腔结构优化研究

压裂泵液力端阀箱内腔在加工完成后会自然形成相贯线,该相贯线位置存在严重的应力集中问题。这些位置也是液力端阀箱常见的开裂位置,虽然通过相贯线倒圆角的方式可以减小应力集中程度,但是应力减小的幅度不是十分明显。针对此问题,通过有限元仿真对比的方式进行了阀箱内腔优化研究,提出了减小阀箱内腔应力集中程度的技术方案,同时提出了应用该方案时应注意的一些问题。研究结果对于提高压裂泵液力端使用寿命及优化压裂泵液力端设计具有一定的指导意义。     

喷嘴湿气井两相流在线计量装置研究及应用

传统的湿气井计量大多采用分离法,存在工艺流程复杂、造价高昂、占地面积大等缺陷。研制了以喷嘴为节流元件的湿气井气液两相流在线计量装置。应用Fluent软件仿真模拟了单相气、单相液、气液两相流过装置的流动特性,计算了虚高系数,建立了气液两相含率在线计量模型。CFD研究及现场应用表明:该装置模型计量精度高,气相计量误差在5%以内,液相计量误差在8%以内。该装置结构简单,可以将温度、压力、差压、气流量、液流量集成在一个表头显示,可以异地重复使用,维护量少,降低计量设备安装与维护成本,满足气田开发工程计量的需要。