钒掺杂镁基微弧氧化膜的制备及电化学与光学性能

针对TC6钛合金进行了激光冲击强化(LSP)参数设计,应用XRD衍射仪对LSP试件进行了残余应力分布规律测试和图谱分析,采用透射电子显微镜对强化层微观组织进行了观察,对有无LSP标准振动疲劳试件进行了振动疲劳对比试验.研究表明,TC6钛合金LSP较佳功率密度为3 GW/cm2,LSP能在材料表层产生深度为1.6 mm的高数值残余压应力场,表面残余应力可达-660 MPa,深度为0.1 mm处残余应力最大,最大值可达-690 MPa; LSP后没有新相产生,且晶粒细化、残余微观应变导致Bragg衍射峰宽化;LSP后钛合金表层出现高密度位错和纳米晶;钛合金标准振动疲劳试件LSP后疲劳极限由438.6 MPa增加至526.7 MPa,提高20.1％;疲劳断口分析表明LSP产生的组织细化和高数值残余压应力场可以有效抑制疲劳裂纹的萌生和扩展,从而提升TC6钛合金的抗疲劳性能.     

双塔楼结构减震效果研究

通过有限元分析软件ANSYS建立了用阻尼器连接双塔楼的简化分析模型,利用时程分析分别对两个单塔楼和用阻尼器连接的双塔楼进行分析,比较了各单塔楼结构的减震效果。通过工程算例对双塔连体结构的各层加速度进行对比分析。     

井下爆破空气冲击波安全距离诺模图实现

井下爆破空气冲击波超压计算公式属于多变量的指数函数表达式,安全距离的解算需要通过数值计算方法,不便于现场运用.诺模图法可以把数学方程变换成变量之间的直线或曲线图,方便问题的求解.本文依据井下空气冲击波超压计算公式,以人体能够承受的超压为定值,采用诺模图技术制作出了爆破药量、安全距离、巷道特征参数之间的图形关系,利用绘制的图形可以确定爆破安全距离.该方法包含数据量大,精度符合工程要求,查用简单方便,可以作为确定井下空气冲击波安全距离的标准用图.     

Improving the fretting performance of aero-engine tenon joint materials using surface strengthening

This paper summarises the regulation mechanism of the traditional and emerging surface strengthening treatments – mechanical shot peening (SP) and laser shock processing (LSP) treatment, respectively – on the fretting fatigue behaviour of the tenon joint materials of aero-engine cold-end parts, as surface strengthening treatment contributes to the improvement of service performance. From the point of view of the actual service environment of turbine components, this paper also expounds on the key problems faced by surface strengthening treatments in improving the mechanical properties of joint materials for aero-engine hot-end components. The application of LSP in the fretting fatigue life extension of turbine joint materials has strong feasibility and development prospects.     

固态飞行参数记录器设计

针对某飞机飞行数据碰记录器体积大、重量重以及价格昂贵的缺点,设计了一种新型飞行数据固态记录器。介绍了新型飞行数据固态记录器的工作原理及采用大容量CF卡以FAT32格式保存飞行数据的具体实现。该设计最终达到了存储容量大、体积小、重量轻、成本低、可靠性高等目的。     

Mullitization of Andalusite and Influence of Aggregates on Properties of Aluminosilicate Refractories Based on Andalusite Matrix

The mullitization of andalusite from Xinjiang,China and influence of aggregates on properties of aluminosilicate refractories were studied by XRD,SEM,EDS,DSC.It was found that mullitization was obvious at 1 400 ℃,but considerable at 1 500 ℃.The refractories with corundum aggregates had the highest RUL and the lowest creep rate,but refractories with bauxite aggregates had the lowest RUL and the highest creep rate.     

金黄色葡萄球菌中毒休克综合征毒素1基因的检测

目的检测编码金黄色葡萄球菌中毒休克综合征毒素l(TSST-1)的tst基因,了解该基因的携带情况。方法用PCR法对产毒素金黄色葡萄球菌染色体上编码TSST-1的tst基因进行体外扩增,并对临床分离的84株金黄色葡萄球菌进行tst基因检测及序列分析。结果对tst基因进行了检测及测序,84株受检的金黄色葡萄球菌中,tst基因阳性株占19.05%(16/84),测序结果与GenBank公布的金黄色葡萄球菌产TSST-1基因的同源性较高。结论用PCR法检测tst基因,具有良好的重复性、特异性和敏感性。tst基因阳性株在临床分离的金黄色葡萄球菌中占有较高的比例。     

Effect of Fused MgO-ZrO_2 Clinker Addition on Thermal Shock Resistance of MgO-ZrO_2 Unfired Bricks

MgO-ZrO2 unfired bricks with ZrO2 content up to 8% at the interval of 2% were prepared,using fused magnesia(MgO:97%)and fused MgO-ZrO2 clinker(ZrO2:14.33%)as starting materials and phenolic resin as binder.The effects of ZrO2 content on thermal shock resistance(TSR)and other properties such as cold and hot modulus of rupture have been investigated.Residual cold modulus of rupture ratio after heating at 1 000 ℃ and quenching by air blowing was adopted to characterize TSR.Addition of the MgO-ZrO2 clinker impr...     

创伤性失血性休克患者的急救措施

目的探讨创伤性失血性休克患者的急救措施。方法对我院80例创伤性失血性休克患者采取相应的急救措施。结果本组好转68例,占85.0%,无变化5例,占6.25%;恶化3例,占3.75%,死亡4例,病死率5.0%。结论在创伤性失血性休克的急救中,应保持患者的呼吸道通畅,迅速建立静脉通道,严密观察病情注意生命体征,同时做好患者的心理护理,提高急诊救护的护理质量。     

DESIGN METHOD OF MAGNETO- RHEOLOGICAL FLUID SHOCK ABSORBER FOR CAR SUSPENSION

The Bingham constitutive model, which is previously used in depiction of magnetorheological （MR） fluids rheological behaviors for design devices, exhibits discontinuous characteristics in representation of pre-yield behaviors and post-yield behaviors. A Biviscous constitutive model is presented to depict rheological behaviors of MR fluids and design automotive shock absorber. Quasi-static flow equations of MR fluids in annular channels are set theoretically up based on Navier-Stokes equations and several rational simplifications are made. And both flow boundary conditions and flow compatibilities conditions are established. Meantime, analytical velocity profiles of MR fluids though annular channels are obtained via solution of the quasi-static flow equations using Biviscous constitutive model. The prediction methodology of damping force offered by MR fluid shock absorber is formulated and damping performances are predicated in order to determine design parameters. MR fluid shock absorber for Mazda 323 car suspension is designed and fabricated in Chongqing University, China. Measurements from sinusoidal displacement cycle by Shanchuan Shock Absorber Ltd. of China North Industry Corporation reveal that the analytical methodology and design theory are reasonable.