Stress relaxation behavior of Ti-6Al-4V alloy

1　INTRODUCTIONTi 6Al 4VisoneofthemostimportantTial loys[1,2 ] .Butthisalloyhasbadformabilityforitshighelasticresilience .Therefore ,hotsizingisimpor tant[36 ] .Asthebaseofhotsizing ,thestudyofstressrelaxationhasimportanttheoreticalvalueandpracticalsignificance .Ontheotherhand ,Ti 6Al 4Visusedasfastenermaterialssometimes .Whenthefastenersworkatthetemperaturehigherthanroomtemperature ,stressrelaxationmayresultsinacci dents .Sohowtopreventthestressrelaxationisveryimportant[7] .Uptonow ,…     

对坪北无职党员发挥先进性作用情况的调查与思考

从现实情况来看,影响无职党员发挥作用的原因有四点:1、少数干部把无职党员的作用看得无足轻重,挫伤了他们的积极性。2、少数单位忽视了理想和奉献精神教育,部分无职党员的先锋队意识下降。3、少数支部对如何发挥无职党员的作用缺乏具体要求和引导。4、少数无职党员自身素质不高,无能力发挥作用。针对这种情况特提出具体的工作对策:1、下功夫为无职党员发挥作用创造良好的外部条件。2、想办法激发无职党员发挥作用的内在动力。3、明确无职党员在哪些方面发挥作用。4、建立考核、约束机制,敦促无职党员发挥作用。5、保证无职党员的权利和义务相统一。     

EB-PVD制备钛合金薄板渗铝相结构转变研究

对电子束物理气相沉积(EB-PVD)技术制备的钛合金薄板进行粉末包埋法渗铝,研究不同温度渗铝后的相结构转变规律.结果表明:制备态合金薄板相结构为Ti和Ti3Al,材料组织致密均匀,X射线衍射峰发生宽化,具有不对称性.在较低温度(600℃和620℃)渗铝后薄板两边的相结构变为Al3Ti相,但薄板的中心部位仍然为制备态的Ti3Al相,两边的Al3Ti组织和中心部位的Ti3Al组织都很均匀致密.在两相之间,存在清晰、平整的界面.在较高温度(700℃)渗铝后薄板的相结构为Al3Ti,此时整个板材都被渗穿,组织均匀致密,并在局部小区域内出现铝元素的富集.     

高碳高速钢轧辊中合金元素的作用及成分设计

高碳高速钢轧辊具有良好的抗高温磨损和抗热疲劳性能,在热轧钢生产中获得了广泛的应用。本文对高碳高速钢轧辊中各种元素的作用进行了详细分析,并设计了耐磨高速钢轧辊成分,应用于热轧棒材轧机上,获得了良好的使用效果。     

Face anti-spoofing based on multi-modal and multi-scale features fusion

Face anti-spoofing is used to assist face recognition system to judge whether the detected face is real face or fake face. In the traditional face anti-spoofing methods, features extracted by hand are used to describe the difference between living face and fraudulent face. But these handmade features do not apply to different variations in an unconstrained environment. The convolutional neural network (CNN) for face deceptions achieves considerable results. However, most existing neural network-based methods simply use neural networks to extract single-scale features from single-modal data, while ignoring multi-scale and multi-modal information. To address this problem, a novel face anti-spoofing method based on multi-modal and multi-scale features fusion ( MMFF) is proposed. Specifically, first residual network ( Resnet )-34 is adopted to extract features of different scales from each modality, then these features of different scales are fused by feature pyramid network (FPN), finally squeeze-and-excitation fusion ( SEF) module and self-attention network ( SAN) are combined to fuse features from different modalities for classification. Experiments on the CASIA-SURF dataset show that the new method based on MMFF achieves better performance compared with most existing methods.     

基于小包规律分析的BT流量识别技术

为提高在采样环境中Bernaille等的早识别技术对BT(BitTorrent)流量识别的准确性,通过分析BT协议和BT实际传输数据,找出其中BT传输过程前期有效载荷低于70个字节的小包出现的规律,并以此为基础来识别BT流量。实验表明,对比早识别技术,该方法能够提高在采样环境中识别的准确性,克服了早识别技术对BT流中前几个数据包的依赖的不足。     

烟气脱硝技术及其技术经济分析

介绍了SCR、SNCR以及SNCR/SCR联合技术等3种脱硝技术,并引进了对电厂投资脱硝设备决策有重要意义的技术经济分析方法。主要考虑3种脱硝技术的设计参数及对电厂现有设备运行的影响;通过计算年费用、脱除每吨NOx的费用以及排污费、贷款政策对脱氮费用的影响等进行综合比较。将经济学的动态分析模型用于对烟气脱硝装置的经济评价,为电厂进行初步决策和可行性研究提供了依据。     

Mechanism and control technology of strong ground pressure behaviour induced by high-position hard roofs in extra-thick coal seam miningOA

This work aimed at revealing the mechanism of strong ground pressure behaviour(SGPB) induced by high-position hard roof(HHR). Based on the supporting structures model of HHR, a modified voussoir beam mechanical model for HHR was established by considering the gangue support coefficient, through which the modified expressions of limit breaking span and breaking energy of HHR were deduced.Combined with the relationship between the dynamic-static loading stress of supporting body(hydraulic support ...