摘要：感应淬火冷却系统可能采用各式各样的搅拌方式,包括传统的浸淬、开放式喷雾冷却和浸没状态下的喷射冷却。这些工艺并不等效,而是要根据正确的技术要求来恰当地选用这些方法。本文对这些不同的搅拌系统进行了综述。

摘要：一些铝的锻件和铸件为了达到设计的最小物理性能都是在冷水中淬火。遇到不能接受的变形或开裂时习惯改用热水。但是热水淬火有代表性的结果是,明显降低机械性能和大大增加潜在的晶间腐蚀。大约30年前,SEA介绍了I型聚乙烯共聚物淬火介质代替热水。这些淬火介质在仍然达到Mil手册5设计的最低性能的前题下,能得到明显的,常常是意想不到的减少残余应力和变形的优点。但是即使这些淬火介质已使用了很长时间,当要使用和如何检测时仍然广泛存在不了解如何应用。本文的目的就是解决这些问题。

摘要：critical bone defects are considered one of the major clinical challenges in reconstructive bone *** combination of 3D printed conductive scaffolds and exogenous electrical stimulation(ES)is a potential favorable approach for bone tissue *** this study,3D conductive scaffolds made with biocompatible and biodegradable polycaprolactone(Pcl)and multi-walled carbon nanotubes(MWcNTs)were produced using the extrusion-based additive manufacturing to treat large calvary bone defects in *** results show that the use of Pcl/MWcNTs scaffolds and ES contributes to thicker and increased bone tissue formation within the bone *** and mineralization are also significantly promoted using high concentration of MWcNTs(3 wt%)and ***,scaffolds favor the tartrate-resistant acid phosphatase(TRAP)positive cell formation,while the addition of MWcNTs seems to inhibit the osteoclastogenesis but present limited effects on the osteoclast functionalities(receptor activator of nuclear factor κβ ligand(RANKl)and osteoprotegerin(OPG)expressions).The use of ES promotes the osteoclastogenesis and RANKl expressions,showing a dominant effect in the bone remodeling *** results indicate that the combination of 3D printed conductive Pcl/MWcNTs scaffold and ES is a promising strategy to treat critical bone defects and provide a cue to establish an optimal protocol to use conductive scaffolds and ES for bone tissue engineering.

摘要：汽车和航空航天工业对减少运载工具重量的需求不断增加,这就需要发展改良的结构铝基合金。因此,本文作者研究设计Al-7%Si-0.3%Mg合金的水平凝固实验。研制并使用水冷式水平定向凝固装置。运用金相、光学显微镜、扫描电镜等传统技术表征材料的显微组织。用Thermo-calc软件模拟含0.17%fe(质量分数)合金的凝固路径。研究生长速度(V_l)、冷却速度(T_c)和凝固局部时间(t_(Sl))等热力学参数对显微组织形成和枝晶显微组织演化的影响。当V_l和T_c值分别为0.82~0.98 mm/s和1.71~2.55°c/s时,柱状晶向等轴晶转变(cET)。通过测量一次和二次枝晶间距(分别为λ_1和λ_2)对显微组织进行表征。提出实验性定律:λ_(1,2)=f(V_l,T_c),λ_2=f(t_(Sl));并观察到枝晶区包含以下共晶混合物:α(Al)+Si+π-Al_8Mg_3fe Si_6+θ-Mg_2Si。

摘要：文章介绍在 Ｌｉｎｕｘ操作系统网络环境下，负载共享系统的基本设计原理和实现方法。重点描述客户一服务器通信模式以及程序模块的算法框架。

摘要：直剪仪是测定岩土体抗剪强度参数应用最为普遍的一种试验仪器。从直剪仪的结构和大型直剪仪的研制两个方面对直剪仪的研究现状做了介绍,在此基础上,对新近研制的现场室内两用大型直剪仪的结构组成、工作机理及其特点进行了详细分析。该大型直剪仪与常规直剪仪相比,具有较大的优越性,其测试结果更加准确。适用范围广,测试精度高,可应用于现场和室内试验。

摘要：提出了一种直观、高效地用于概念设计作图的徒手输入、进行几何变形的方法 .采用此方法可以徒手输入两笔曲线 (参考曲线和目标曲线 ) ,并据此二曲线来移动多边形模型的顶点 ,从而达到变形三维模型的目的 .解决了大曲率变形时产生的自相交问题 .另外 ,还可用来定义变形影响区域 .

摘要：The objective of the Apollon project is the generation of 10 PW peak power pulses of 15 fs at 1 shot/minute. In this paper the Apollon facility design, the technological challenges and the current progress of the project will be presented.

摘要：The group Ⅲ nitrides are an important class of materials with aplications in UV and visible optoelectronics,high temperature electronics,cold cathodes and solar blind *** recent years,with the realisation of nitride based lEDs,the use of GaN IED has the potential to compete with 1raditional filament and discharge lamps,for the provision of white lighting,and there has been an explosion of interest in the MOcVD growth of GaN based materials with an increasing focus on large area multiwafer reactors and wafer *** paper will review the design philosophy and characteristics of close-coupled showerhead reactors,relating these to the requirements of group Ⅲ-nitride growth,and will present a selection of data resulting from the operation of such *** results suggest that the close coupled showerhead style of reactor is very suitable for the growth of GaN based structures in both research and production environments.

摘要：At the moment,a 70MeV cyclotron is under construction by the IBA *** cyclotron will be able to accelerate H- beam from a multicusp source and with a beam intensity in the range of 10mA at the source extraction.A He1+2+ beam is also *** beam will be produced by a PANTEcHNIK EcR ion source（SUPERNANOGAN）with an extracted current of 1 to *** this paper the studies and design of the two sources with a common axial injection in the cyclotron are described.