纯美绽放——锐志音响改装

REIZ锐志集顶级行驶性能与无限运动感于一身,将中级车的开发理念和综合性能推向了一个前所未有的高度：首次采用了通常高级车所采用的FR前置发动机后轮驱动技术,使顺畅的操控性与澎湃的驱动力兼收并蓄,真正实现了中级车中顶级的行驶性能;此外,其四轮更接近车身四角的贴心设计,最大程度上实现了低重心稳定感,通过最科学的布局,达成前后车身重量54：46的理想分配。     

面向隐私保护联邦学习的医学影像目标检测算法

联邦学习技术是一种新型多机构协同训练模型范式,广泛应用于多领域,其中模型参数隐私保护是一个关键问题.针对CT影像综合性病灶检测任务,提出隐私保护的联邦学习算法.首先部署松散耦合的客户端-服务器架构;其次在各客户端使用改进的RetinaNet检测器,引入上下文卷积和后向注意力机制;最后完成联邦训练.各客户端使用局部更新策略,采用自适应训练周期,局部目标函数中加入了限制项;服务器使用自适应梯度裁剪策略和高斯噪声差分隐私算法更新全局模型参数.在DeepLesion数据集上的消融分析说明了算法各部分的重要性.实验结果表明,改进的RetinaNet检测器有效地提升了多尺度病灶的检测精度.与集中数据训练模型范式相比,联邦学习所得模型性能略低(mAP分别为75.33％和72.80％),但训练用时缩短近38％,有效地实现了隐私保护、通信效率和模型性能的良好权衡.     

水轮机转轮立式静平衡方法的研究进展

水轮机转轮质量不平衡是水轮机组产生振动的主要原因之一,通过静平衡试验获得转轮不平衡重量和不平衡角度,完成对不平衡点的检测和配重,降低转轮振动幅值和摆动幅值至容许范围。综述了水轮机转轮立式静平衡方法的研究进展,介绍了该静平衡方法的原理及5种不同的静平衡试验方法,分析了这几种静平衡方法的优缺点,并对今后水轮机转轮立式静平衡方法的研究方向给出了一些建议。     

曙光5-A-01无人机适合人口密集城市应用

<正>青岛宏百川金属精密制品有限公司制造的曙光5-A-01伞降旋翼无人直升机亮相第十届中国国际航空航天博览会。该无人机采用独特设计的"降落伞应急故障安全系统",遇到突发事件时可实现无人机伞降,以防止机体掉落时伤人砸物,非常适合在人口密集城市中应用。该无人机机身高0.99m,总长2.6 2 m,飞行高度可达7000m,空机重量38kg,最大     

高效液相色谱法测定氨甲基膦酸的含量

建立高效液相色谱法测定不同批次氨甲基膦酸的含量.采用Welch Ultimate HILIC Amide色谱柱,以0.1mol/L甲酸铵溶液(甲酸调pH=3.0)—乙腈为流动相进行等度分离,直接进样,用电喷雾检测器(CAD)测定氨甲基膦酸的含量.试验结果表明,氨甲基膦酸进样精密度RSD为0.04%,进样量在2.5~12.5μg范围内时呈现良好线性关系,相关系数r=0.999 0,定量限为0.041 52g/L.     

Enhanced healing of full-thickness diabetic wounds using bioactive glass and Yunnan baiyao ointments

In order to accelerate the chronic wounds healing, we investigated the healing effects of bioactive glass and Yuunan baiyao ointments in streptozotocin-induced diabetic rats. The ointments were prepared by mixing 45S5 bioactive glass powder （16% weight） with Vaseline and different weight percentages of Yurman baiyao. Full-thickness defect wounds were created on the back of 130 SD rats and were randomly divided into 8 groups. The wound healing rates were calculated at 4, 7, 10, 14 and 21 days after surgery. The samples were harvested for further observations. Considering the wound closure rate, group 6 （with 5% Yuunan baiyao） has better wound healing performance than other diabetic groups. The lower inflammatory response was observed by gross observation and confirmed by the results of H＆E staining and TEM observation. Besides, the proliferation of fibroblasts, the formation of granulation tissue, as well as the vascularization, were improved in group 6 compared to other diabetic groups. All results suggest that bioactive glass and Yunnan baiyao ointments can accelerate the recovery of diabetes-impaired skin wounds, and comparing to other diabetic groups, group 6 （with 5% Yunnan baiyao） has better healing effect.     

260吨钢锭浇铸成功

<正> 7月22日第二重机厂成功地真空浇铸了国内第一支最大的钢锭。钢号是20SiMn。重量是260吨,有24个棱,高径比为1.34,锭身锥度为8％,其径向最大尺寸为5054mm,总高6785mm。为减轻吊具重量在冒口上直接铸出二个吊耳供脱模之用。钢水在两个车间六台炉子中冶炼。浇铸过程是在一乇左右的真空度下进行。为保证安全优质的生产这支大型钢锭,技管人员和工人采取了一些有效的技术措施和生产调度措施。这支钢锭的生产,填补了重型机械行业上又一个空白。就锻件而言,今后可望生产拔长达400吨,镦粗达300吨钢锭的等级能力。     

Oxidation behavior of three-phase Cu-25Ni-30Cr alloy at 700-800℃ under high oxygen pressures

The thermogravimetric analysis of a ternary Cu-25Ni-30Cr alloy prepared by conventional casting was performed in 0. 1 MPa pure O2 at 700-800℃. The results show that the alloy is composed of three phases,where the phase with the largest copper and lowest chromium content forms the matrix, while the other two,much richer in chromium, form a dispersion of isolated particles. At variance with another three-phase Cu-20Ni-20Cr alloy, which forms complex scales containing the oxides of the various components and double oxides plus an irregular region composed of alloy and oxides, the present alloy can form a very irregular but continuous chromia layer at the base of the mixed internal region, producing a gradual decrease of the oxidation rate down to very low values. A larger chromium content needed to form chromia layer for a ternary three-phase alloy is attributed to the limitations to the diffusion of the alloy components in the metal substrate imposed by their multiphase nature.     

冒口重量网络图确定法

以圆柱和腰圆冒口为例，提出了坐标曲线网络图方法，根据已知的冒口尺寸即可由坐标曲线网络查取任一冒口重量。     

AT90CAN128的有轨电车检测器设计

本设计以AT90CAN128为控制核心,利用其输入捕捉单元对线圈频率的变化进行检测,使用CAN通信接口将检测结果实时传送,来实现车辆存在与否的可靠检测.本设计将应用于现代有轨电车轨道占用检查子系统中,实现在道岔处对轨道占用的检测,来保障电车的安全行驶和运营调度系统的高效运行.