墙体参数模糊下穿墙雷达运动目标成像

针对墙参数模糊条件下运动目标成像速度慢、墙参数重建精度差等问题,提出了一种改进拟牛顿-粒子群优化(Limited Broyden Fletcher Goldfarb Shanno-Particle Swarm Optimization,LBFGS-PSO)算法,建立了LBFGS-PSO算法模型,解决了传统拟牛顿算法和粒子群算法计算速度慢、误差较大等问题。该算法与块正交匹配追踪（Block Orthogonal Matching Pursuit,BOMP）算法相结合不仅可以精确重建边墙位置,还能够准确地重建多径效应环境中的运动目标和静止目标,算法的计算速度和精度得到了一定程度的提高。仿真结果和数据分析验证了所提方法的性能。     

Medication,equipment, and supply costs for common interventions providing extended post-surgical analgesia following total knee arthroplasty in US hospitals

Aims: To estimate the cost to hospitals of materials (i.e. medications, equipment, and supplies) required to administer common interventions for post-surgical analgesia after total knee arthroplasty (TKA), including single-injection peripheral nerve block (sPNB), continuous peripheral nerve block (cPNB), periarticular infiltration of multi-drug cocktails, continuous epidural analgesia, intravenous patient-controlled analgesia (IV PCA), and local infiltration of bupivacaine liposome injectable suspension (BLIS).

Materials and methods: This analysis was conducted using a mixed methods approach combining published literature, publicly available data sources, and administrative data, to first identify the materials required to administer these interventions, and then estimate the cost to the hospital of those materials. Medication costs were estimated primarily using the Wholesale Acquisition Costs (WAC), the cost of reusable equipment was obtained from published sources, and costs for disposable supplies were obtained from the US Government Services Administration (GSA) database. Where uncertainty existed about the technique used when administering these interventions, costs were calculated for multiple scenarios reflecting different assumptions.

Results: The total cost of materials (i.e. medications, equipment, and supplies) required to provide post-surgical analgesia was $41.88 for sPNB with bupivacaine; $756.57 for cFNB with ropivacaine; $16.38 for periarticular infiltration with bupivacaine, morphine, methylprednisolone, and cefuroxime; $453.84 for continuous epidural analgesia with fentanyl and ropivacaine; $178.94 for IV PCA with morphine; and $319.00 for BLIS.

Limitations: This analysis did not consider the cost of healthcare providers required to administer these interventions. In addition, this analysis focused on the cost of materials and, therefore, did not consider aspects of relative efficacy or safety, or how the choice of intervention for post-surgical analgesia might impact outcomes such as length of stay, re-admissions, discharge status, adverse events, or total hospitalization costs.

Conclusions: This study provided an estimate of the costs to hospitals for materials required to administer commonly used interventions for post-surgical analgesia after TKA.     

四川省耕地资源可持续利用

四川省山地多，平地少，耕地比重小，人口多且分布不均衡。主要农耕区四川盆地人地矛盾尖锐。控制耕地占用和人口增长。加大农业科技投入是实现四川省耕地可持续发展的重要措施。     

解析法化简控制系统传递函数方框图的研究

在经典控制理论中,传递函数方框图化简的常用方法有等效变换法和Mason增益公式法。对于复杂系统的传递函数方框图,等效变换法化简步骤繁琐,Mason增益公式法根据信号流图求传递函数不易理解。提出了一种传递函数方框图化简的解析办法,该方法用解析方程或方程组的形式表示系统输入、输出的关系,是等效变换法和Mason增益公式法的一个很好补充,具有较强的实用性。     

街区经济发展中土地集约利用评价研究——以西安市莲湖区为例

研究目的:以街区经济为平台,定量评价研究区内街区土地集约利用整体状况,以期为其他区域发展街区经济、合理利用土地提供参考。研究方法:地理信息系统(GIS)技术和方法,多因素综合评价法,聚类分析法。研究结果:选择的西安市莲湖区38个街区中,土地集约利用存在一定的差异,较好集约利用3个,一般集约利用24个,低度利用11个,因此在发展街区经济时,应采取提高区域整体经济水平、提高商业用地在整个街区中所占的比例和提高街区商业用地的容积率等措施来提高土地集约利用水平。研究结论:西安市莲湖区街区经济土地集约利用仍有较大潜力。     

手术治疗急性梗阻性大肠癌临床探讨(附168例报告)

目的 探讨急性梗阻性大肠癌的手术治疗原则及预后.方法 分析168 例急性梗阻性大肠癌的手术治疗临床资料,其中右半结肠癌18 例,左半结肠癌60 例,直肠癌90 例.168 例中Dukes B 期24 例,C期80例,D期64 例.168 例均手术治疗,其中行结肠造口18 例,miles 手术64 例,Hartmann 手术18 例,一期切除吻合加肠外置术12 例,结肠灌洗一期切除吻合56 例.结果 治愈164 例,死亡4 例.未能切除癌肿的2 例患者术后5 月死亡.结论 手术治疗是解除急性梗阻性大肠癌的唯一方法.应根据患者的不同情况选择合理的手术方式.     

高等教育学费问题探讨

对高等教育收费水平的现状进行了分析,预测了收费水平的基本增长趋势。并从影响学费的相关因素的角度对学费水平进行了系统分析,结合办学成本、政府拨款和农村居民可支配收入给出了可行性报告和建议。     

基于采集终端的旋转式强电隔离装置设计

提出了一种旋转式强电隔离装置的设计方法,详细阐述了该装置的零件组成、工作原理、结构特点以及作用,解决了现有的电能量数据采集终端存在的技术缺陷,因而具有广泛的实用价值。     

改进的Loran-C同步干扰抑制高效自适应算法

针对目前Loran-C系统抑制同步干扰所采用的自适应算法存在运算量大、定位时间长 的缺点,提出了一种改进算法,即BMMax-NLMS算法,并对运算量进行了比较。通过建立Lora n-C信 号模型,运用改进算法对干扰信号进行自适应滤波。仿真结果表明,该算法能够在抑制同步 干扰的同时有效减少运算量。最后,利用实测数据进一步验证了这些结论。     

Further empirical evidence on block transactions below the MBR: the Spanish market

There is a relatively unknown market for partial control or corporate influence in Spanish listed firms, where the control transaction size is below the legal threshold that triggers a mandatory tender offer, as this kind of deal looks for exercising some degree of control, but not a full control. The goal of this paper is to go further in its empirical analysis by exploring its distinguishing features, using as the criterion to define its transactions obtaining a seat in the board of directors. We find that these deals are mainly located in the segment of the market of large trades where the rules for private negotiations are easier to implement; the size of the block is relatively large and it is negotiated as a whole block. Besides, the most common buyer has no previous stake in the firm. We find no evidence that the buyers pay, in median, for a seat on the board of directors, but the variability of the premiums for those blocks is higher and shows that buyers that had no control position in the target firm pay more for being among largest shareholders (partial control) and less for not being among them (influence).