摘要：The channel state information at transmitter （CSIT） acquisition plays a key role in the multi-input multi-output （MIMO） system, especially for the precoding schemes. However it is unrealizable to acquire perfect CSIT in practice. In this article, an effective and practical dynamic CSIT model is introduced to acquire imperfect channel state information. For practicability, the channel temporal and spatial correlations are considered and the channel estimate and its error covariance are obtained by utilizing the outdated channel state information. Based on the dynamic CSIT mode, closed-form solution of robust Tomlinsion-Harashima precoding （THP） is derived by a Lagrangian approach. Numerical simulations are presented to demonstrate the performance.

摘要：研究施用炭基微生物有机肥对贵港市覃塘毛尖茶春茶的影响,在10年生福鼎大白茶园内,设计4个炭基微生物有机肥施用量梯度处理,探讨不同炭基微生物有机肥施用量对茶叶春茶百芽重及品质的影响。结果表明,施用了炭基微生物有机肥的茶叶叶片比未施用的更大、更嫩绿,在4个梯度处理中,施用炭基微生物有机肥6000 kg·hm^(-2)效果最好,与常规施肥相比百芽重增加29.97%,儿茶素品质指数提高7.10。

摘要：目的研究一种基于计算机立体视觉的乳腺癌放射治疗摆位验证的方法,以减少在乳腺癌分次放射治疗中,由于多次摆位、体型变化等因素的影响造成肿瘤位置动态位移引起治疗误差。方法使用由双摄像机组成的计算机视觉系统,准确匹配出多个特征标记物在左右两摄像机采集的图像中的具体坐标,依据双目成像的基本原理计算出各标记物在胸腹部表面特征点的三维坐标值,构建出乳房及胸部体表的立体特征形状,以此来完成在分次放射治疗前摆位准确性的在线判定。在算法设计过程中,采用动态选择待匹配图像和局部搜索的策略,目标图像匹配精确。结果调试实验表明,系统能够准确提供各标记点的三维空间位置,并且能够做到实时性计算。结论基于计算机立体视觉的乳腺癌放射治疗摆位系统能够为放射治疗摆位提供一定的定位数据指导。

摘要：采用Deutsch假设法,研究了不同组合架设方式下同塔双回高压/特高压直流输电线路地面合成场强的分布特性。结果表明:Deutsch假设计算结果与实测结果较吻合,适用于双回直流线路的预测。高压/特高压直流线路同塔双回架设时,因空间离子流场的相互影响,地面合成场强分布与塔型和导线布置方式有较大关系。±800 k V特高压直流线路位于上层、极导线采取+-/-+方式布置时,地面合成场强最大值相比采取-+/-+方式布置增加了17%;±800 k V特高压直流双极线路位于杆塔同一侧、极导线采取++/--方式布置时,地面合成场强最大值相比采取+-/-+方式布置时增加了9%;相同的高度、不同的塔型,地面合成场强最大可增加18%。上下层导线间距的变化对地面最大合成场强值的影响较小。同时,计算给出了不同塔型线路架设最小高度建议值。

摘要：采用电气控制铝合金阳极氧化工艺的方法,研究了磷酸溶液浓度、氧化时间、氧化温度、氧化电压对铝合金阳极氧化表面形貌的影响,并分析了碳纤维预浸渍前后对碳纤维金属层板力学性能的影响。结果表明,当采用电气控制,磷酸溶液浓度为30g/L、氧化时间为5min、氧化温度为15℃、氧化电压为120V时,铝合金材料表面可见尺寸均匀、孔径较大的纳米孔,为适宜的阳极氧化工艺;在此工艺下,采用热挤压方法制备了碳纤维金属层板,经过预浸渍的碳纤维金属层板的冲击强度、剪切强度和弯曲强度相较于未经预浸渍的碳纤维金属层板分别提高了19.38%、4.55%和22.08%,预浸渍前后碳纤维金属层板的断口形貌的观察结果与力学性能测试结果一致。

摘要：目的:分别构建携带HcRed基因的PET28a(+)原核和PIRES真核载体,并分别在大肠埃希菌和鼠树突状细胞系(DC2.4)中表达、鉴定,为后续基因及蛋白的转染提供基础。方法:参照基因库中HcRed1基因序列,设计HcRedCDS全长引物,以含有HcRed的质粒为模板,通过PCR获得目的基因,并分别连接于PET28a(+)原核载体和PIRES真核载体。经PCR、酶切鉴定后,原核载体转化大肠埃希菌,经IPTG诱导表达;真核载体用脂质体转染DC2.4,G418筛选出克隆后,应用RT-PCR和流式细胞仪进行检测。结果:扩增出687 bp的HcRedCDS区序列,构建了原核和真核表达载体PET28a(+)/HcRed和PIRES/HcRed,分别于大肠埃希菌和DC2.4细胞系中成功表达。结论:成功构建HcRed基因的原核、真核表达载体,并分别在工程菌和细胞系中成功表达,为后续基因及融合蛋白的筛选、示踪和体内观测奠定了基础。

摘要：介绍了一种基于 PCI总线的高速大容量数据采集卡的设计原理与实现。该采集卡由预处理电路、A/D转换器、同步动态随机存储器 (SDRAM)、高频时钟发生器、集成于 FPGA芯片的 PCI接口控制器和 SDRAM控制器组成。它通过 PCI总线接口与计算机连接 ,可完成 40 0 MHz/s实时数据采集、5 1 2 MB实时数据存储。

摘要：Jet pulse assembly is one of the main components of jet hydraulic *** pressure wave characteristics produced by jet pulse assembly have an important influence on the performance of the *** this paper,the structure and working principle of jet pulse assembly are studied,the mechanical analysis model of piston rod is established,the dynamic resistance ratio formula of jet pulse assembly is deduced,and the numerical simulation test of 89-mm jet pulse assembly structure parameters is carried *** results show that the piston rod downward stroke is driven by both the jet element driving force and the throttle plate load driving force,and can stably *** driving force of the piston rod upward stroke jet element is opposite to the load acting force of the throttle disc,and the jet driving force needs to be greater than the load resistance of the throttle disc to stably *** dynamic resistance ratio formula is *** the area of the end of the piston rod is reduced,the resistance of the throttle disc is reduced and the jet power is increased,thus solving the problem of insufficient power of the piston rod in the upstroke and ensuring the normal operation of the *** groups of numerical simulation tests were carried out,and it was found that the pressure amplitude and pressure drop of the tool decreased significantly with the increase of the tool size,and the error between the numerical simulation value and the theoretical calculation value was less than 9%,which verified the correctness of the *** is suggested to select tools on site according to the drilling construction situation to ensure the drilling effect.

摘要：产L-天冬氨酸-β-脱羧酶(L-aspartate-β-decarboxylase,Asd)菌株以L-天冬氨酸(L-aspartic acid,L-Asp)为底物转化生产L-丙氨酸,通过单因素及正交设计试验对睾丸酮丛毛单胞菌HY-08D培养基组成及发酵条件进行优化。结果表明,最佳培养基组成:富马酸1.0%、L-Asp 1.0%、谷氨酸1.0%、玉米浆干粉0.6%、酵母粉0.8%、氯化钠0.7%、磷酸二氢钾0.15%、硫酸镁0.1%,pH 6.0。产酶菌株HY-08D转化用培养液采用三级扩培,一级接二级使用0.1%低接种量,二级接三级使用10%的接种量,最适通气量为10 L/min。优化后培养液中HY-08D菌体量和酶活较初始提高约1倍,培养周期缩短6 h~8 h。

摘要：Flow rate and temperature are important parameters for design and operation of liquid lead–bismuth(Pb Bi) experimental loop. The PREKY facility was designed to study test technique of flow rate and local temperature of Pb Bi loop. In this work, flow rate monitoring of molten Pb Bi was performed, and temperatures of the Pb Bi and pipe surface were measured. The results show that the flow rate of the venturi-nozzle flow meter had an uncertainty of ±5 % in the range of 0.6–2.0 m/s, and the maximum temperature difference between the Pb Bi and pipe surface was about 8 ℃.