Low Complexity Joint Hybrid Precoding for Millimeter Wave MIMO Systems

In millimeter wave(mmWave) multiple-input multiple-output(MIMO) systems, hybrid precoding has been widely used to overcome the severe propagation loss. In order to improve the spectrum efficiency with low complexity, we propose a joint hybrid precoding algorithm for single-user mmWave MIMO systems in this paper. By using the concept of equivalent channel, the proposed algorithm skillfully utilizes the idea of alternating optimization to complete the design of RF precoder and combiner. Then, the baseband precoder and combiner are computed by calculating the singular value decomposition of the equivalent channel. Simulation results demonstrate that the proposed algorithm can achieve satisfactory performance with quite low complexity. Moreover, we investigate the effects of quantization on the analog components and find that the proposed scheme is effective even with coarse quantization.

Sol Gel Assembly and Luminescence of SiO_2/PEMA Hybrid Material Incorporated with Terbium Complex

Ethyl methacrylate (EMA) doped with luminescent ternary terbium complex (Tb(acac) 3·dam) with acetylacetone (Hacac) and diantipylmethane (dam) was incorporated into the microporous silica gel. With the polymerization of EMA, the hybrid material containing Tb(acac) 3·dam was obtained. The hybrid material exhibited good toughness and transparency and higher thermal stability than that of the pure complex and pure polymer matrix. In the range of doping concentration of Tb(acac) 3·dam (0.05%, 0.1%, 0.2%, 0.5%, 1.0%, 2.0% and 5.0%), emission intensity increases with the increasing of corresponding doping concentration and concentration quenching effect has not taken place.

The First Hybrid Wells-Dawson-type Polytungstate Monosupported by Cd-coordination Complex via Di-bridging O-atom

Polyoxometalates（POMs） with Cd-coordination complexes acting as supporting units are rarely reported. The linkage of the supporting units with inorganic building block（polyanion） is generally established on terminal O-atoms, but scarcely via bridging O-atoms. By introducing liquid small organic molecule（pyridine, C5NH5） as assistant ＂structure-directing agent＂, we obtained a novel organic-inorganic hybrid polytungstate,（Hpy）4[Cd（phen）2（P2W18O62）]·nH2O（1, n ≈ 3, py = pyridine, phen = 1,10-phenanthroline）, under hydrothermal conditions. The single-crystal X-ray diffraction analysis shows that 1 is the first compound containing an asymmetric heteropolyanion, [Cd（phen）2（P2W18O62）]4–, a Wells-Dawson-type polyanion monosupported by Cd-coordination complex via di-bridging O-atoms.

Preparation and Characterization of Ternary Europium ComplexDoped Thin SolGel Hybrid Film by Fluorescence Spectroscopy

Ternary europium complex with dibenzoylmethane(DBM)and 1,10phenanthroline(phen)was insitu synthesized in thin SiO2/polyvinyl butyral(PVB)hybrid films by a twostep solgel process and characterized by means of fluorescence spectroscopy.The luminescence spectra,fluorescence lifetimes and photostability were all investigated.The results showed that the hybrid films exhibited the characteristic emission bands of the central rare earth Eu3+.In addition,Eu3+presented longer fluorescence lifetime than in an ethanol solution and the complex had a higher photostability in the hybrid film than in the PVB film containing the corresponding pure complex.

Response surface methodology-based hybrid robust design optimization for complex product under mixed uncertainties

Minimizing the impact of the mixed uncertainties(i.e.,the aleatory uncertainty and the epistemic uncertainty) for a complex product of compliant mechanism(CPCM) quality improvement signifies a fascinating research topic to enhance the robustness.However, most of the existing works in the CPCM robust design optimization neglect the mixed uncertainties, which might result in an unstable design or even an infeasible design. To solve this issue, a response surface methodology-based hybrid robust design optimization(RSM-based HRDO) approach is proposed to improve the robustness of the quality characteristic for the CPCM via considering the mixed uncertainties in the robust design optimization. A bridge-type amplification mechanism is used to manifest the effectiveness of the proposed approach. The comparison results prove that the proposed approach can not only keep its superiority in the robustness, but also provide a robust scheme for optimizing the design parameters.

Syntheses and Structures of Three Hybrid Materials Using Vanadium Polyoxoanions and Macrocyclic Copper Complex as Building Blocks

The reactions of the four-coordinated macrocyclic copper complex [CuL]（ClO4）2（L = 1,4,8,11-tetraazacyclotetradecane） with NH4VO3 under different conditions gave three inorganic-organic hybrid materials of [CuL][VO3]2·2.33H2O（1）, [CuL]3[V（10）O（28）]·8H2O（2） and [Cu L]3[V6O（18）]·8H2O（3）. Single-crystal X-ray diffraction analyses reveal that three diverse vanadium polyoxoanions, [V6O（18）]6- ring, [V（10）O（28）]6- cluster, and [V（12）O（35）]^10- ring, were isolated from the same reactant NH4VO3 under different conditions. The [CuL]^2＋ bridges the [V10O28]6- clusters to form a two-dimensional sheet in 2, and link the [V6O（18）]^6- rings in 1 and [V（12）O（35）]^10- rings in 3 into three-dimensional frameworks, respectively.

Mixed Pyridine-phenol Boron Complex Encapsulated in Polymer/Silica Hybrid Sol-gel Matrix

A novel pyridine-phenol boron complex[（dppy）BF] was encapsulated into polymer/silica composite matrix by sol-gel process. UV-Vis absorption spectra show that this process can control the aggregation structure of complex （dppy）BF. The results of photoluminescence of （dppy）BF in sol-gel composite film indicate that both fluorescence intensity and photostability are markedly increased using this method compared with other methods, which increases the practical significance of such composite film.

Robust H_(∞)state estimation for a class of complex networks with dynamic event-triggered scheme against hybrid attacks

We investigate the dynamic event-triggered state estimation for uncertain complex networks with hybrid delays suffering from both deception attacks and denial-of-service attacks.Firstly,the effects of time-varying delays and finitedistributed delays are considered during data transmission between nodes.Secondly,a dynamic event-triggered scheme(ETS)is introduced to reduce the frequency of data transmission between sensors and estimators.Thirdly,by considering the discussed plant,dynamic ETS,state estimator,and hybrid attacks into a unified framework,this framework is transferred into a novel dynamical model.Furthermore,with the help of Lyapunov stability theory and linear matrix inequality techniques,sufficient condition to ensure that the system is exponentially stable and satisfies H∞performance constraints is obtained,and the design algorithm for estimator gains is given.Finally,two numerical examples verify the effectiveness of the proposed method.

Hybrid Synchronization of Fractional-Order Complex Networks Model via Fractional Order Controller

For the purpose of investigating two complex networks' hybrid synchronization,a controller with fractional-order is provided.Regarding hybrid synchronization which includes the outer synchronization and inner synchronization,some hybrid synchronization's sufficient conditions according to the Lyapunov stability theorem and the LaSalle invariance principle are proposed.Theoretical analysis suggests that,only when the state of driving-response networks is outer synchronization and each network is in inner synchronization,two coupled networks' hybrid synchronization under some suitable conditions could be reached.Finally,theoretical results are illustrated and validated with the given numerical simulations.

Synthesis and Structure of a Novel Chain-like Inorganic-organic Hybrid Constructed from Isopolyanion and Oxalato-bridged Dinuclear Copper Complex

A novel inorganic-organic hybrid based on isopolyanion,{[Cu2（phen）2（μ-ox）][H2Mo8O26]}·4EtOH·Et2O（1） （phen=phenanthroline,ox=oxalate）,was synthesized under open-air mild reaction conditions,and characterized by elemental analysis,IR,ICP,TG and single crystal X-ray diffraction analysis.The crystal structure belongs to triclinic system with space group Pī and cell parameters：a=1.1075（5） nm,b=1.1608（5） nm,c=1.3333（5） nm,α=91.683（5）o,β=113.996（5）o,γ=112.170（5）o,V=1.4159（10） nm3,Mr=2017.44,Z=1,Dc=2.366 g/cm3 and F（000）=980.0.The structure of hybrid 1 is a 1D chain constructed of alternating octamolybdate isopolyanions [β-（Mo8O26）4-] and oxalato-bridged dinuclear copper complex cations [Cu2（phen）2（μ-ox）]2＋.Ultimately,a 3D supramolecular network was formed by hydrogen bond interactions among the adjacent chains.The result shows that hybrid 1 is the first example of inorganic-organic hybrid constructed from isopolyanion and oxalato-bridged dinuclear copper complex fragment （CCDC No.665101）.

The Study Results of F1 Generation of Washington Navel Orange Obtained Through Distant Hybridization

For a successful selection of citrus plants when mating with cultural forms through the method of distant hybridization it is necessary to choose a promising father component such as： a） a complex hybrid of inchangensis ＂Caucasus＂ obtained using hybrid citrange of American origin _ C. Kinokuni X C.ichanglemon, which gives an eatable lemon with a chemical composition similar to the normal lemon fruit and without any damage it can resist frost at -16 ℃ temperature and b） spontaneous mutations of trifoliata： #1 and #2 which are distinguished among trifoliata species. Their fruits don＇t contain or contain a small amount of the substances that deteriorate the taste： naringin, porcine and so on. They are characterized by high index of frost resistance. In the experiment when obtaining sexual hybrids of the Washington naval orange the above mentioned components were used and hybrid seedlings were obtained, which are distinguished according to their phenotypic hereditary features. Selected seedlings represent the best initial material for a successful future work.

Emergency Hybrid Correction in a Newborn with Critical Aortic Valve Stenosis with Acute Pulmonary Edema in the First Hour after Birth

Critical aortic valve stenosis in newborns is the cause of a severe clinical condition with the onset of symptoms during first hours after birth.We present a clinical case of a successful surgical correction of a critical aortic stenosis using a hybrid method applied in a newborn during the first day of life.The infant was diagnosed with a hypoplastic left heart complex with an intact atrial septum(aortic and mitral valves stenosis variant),that led to the cardiogenic shock and acute pulmonary edema.The procedure included bilateral banding of the pulmonary artery branches and atrioseptostomy with stenting of the interatrial septum.The surgery was performed through a median sternotomy.

Complex task planning method of space-aeronautics cooperative observation based on multi-layer interaction

With the new development trend of multi-resource coordinated Earth observation and the new goal of Earth observation application of“short response time,high observation accuracy,and wide coverage”,space-aeronautics cooperative complex task planning problem has become an urgent problem to be solved.The focus of this problem is to use multiple resources to perform collaborative observations on complex tasks.By analyzing the process from task assignment to receiving task observation results,we propose a multi-layer interactive task planning framework which is composed of a preprocessing method for complex tasks,a task allocation layer,a task planning layer,and a task coordination layer.According to the characteristics of the framework,a hybrid genetic parallel tabu(HGPT)algorithm is proposed on this basis.The algorithm uses genetic annealing algorithm(GAA),parallel tabu(PT)algorithm,and heuristic rules to achieve task allocation,task planning,and task coordination.At the same time,coding improvements,operator design,annealing operations,and parallel calculations are added to the algorithm.In order to verify the effectiveness of the algorithm,simulation experiments under complex task scenarios of different scales are carried out.Experimental results show that this method can effectively solve the problems of observing complex tasks.Meanwhile,the optimization effect and convergence speed of the HGPT is better than that of the related algorithms.

基于混合用地模式识别的济南市老城区典型片区绿色空间降温效应分析

城市绿色空间可以通过生态系统服务调节功能有效缓解城市热岛效应,降低高温健康胁迫风险。城市中心城区特别是老城区建成环境具有高度异质性,复杂建成环境中绿色空间的降温效应,特别是混合用地模式中绿色空间的降温强度、阈值、形状等还需进一步明晰。在厘清城市热环境影响因素和绿色空间降温机制基础上,构建了“冷热岛分析提取-混合用地模式聚类识别-混合用地模式热效应分析-典型绿色空间降温效应分析”的研究框架。针对当前城市绿地指标失实、结构失衡、功能失调等现实问题,选择济南市老城区典型片区进行实证研究,重点分析了中层建筑混合用地模式中绿色空间的降温强度、降温面积阈值、形状及植被覆盖度等,总结了具有高降温效能的绿色空间模式,为促进城市健康人居环境发展提供借鉴。

拥堵车源的区域多层交通网络混合路径诱导策略

为了缓解高速公路交通拥堵,利用国道和省道实现交通分流,并有针对性地实施路径诱导策略,建立了考虑拥堵车源的区域多层交通网络混合路径诱导模型。首先,构建了由国道、省道以及湖南省高速公路组成的区域多层交通网络,标定网络链接权重。然后,定位交通拥堵车源,建立了考虑拥堵车源的混合路径诱导模型,对从拥堵车源出发的车辆实施有针对性的路径诱导,在保障缓解交通拥堵效果的同时,尽可能减少对出行者的影响。研究结果表明,该模型能够实现多层网络有效分流,有效减少路网中车辆的平均出行时间。在实际应用中,可以只对少数出行者提供路径诱导信息以降低模型的实施难度,并通过调查出行者对建议路径的接受率,制定合适的路径诱导信息发布方案。

复杂地形下轮腿复合机动平台动态运动控制

复杂地形环境下质心参考轨迹的动态精确跟踪是保障轮腿复合机动平台稳定执行各项任务的关键。为提升平台的地形适应能力与位姿跟踪能力,提出一种动态运动控制策略。综合地形因素,建立包含车轮动力学的单刚体动力学模型,并通过近似简化将系统动力学模型转化为状态空间方程的标准形式。考虑车轮与腿部耦合运动,提出一种基于前馈力矩与反馈力矩的混合运动控制方法。通过二次规划算法求解最优地面反作用力,利用雅克比矩阵将作用力映射至关节以获取前馈力矩。为避免由环境引起的外部扰动造成系统无法在较短时间内完成优化计算,引入关节力矩反馈控制及时修正位姿跟踪误差,使系统能够快速准确地响应外部扰动,有效提高系统的鲁棒性和稳定性。仿真结果表明,新方法可有效提升平台在复杂地形下位姿动态跟踪精度,保障平台平稳运行,为复杂地形下轮腿复合机动平台的工程应用提供有力支撑。

受噪声影响的复hybrid样本的学习理论关键定理

结合机会测度理论和统计学习理论,提出了机会空间上受噪声影响的复hybrid样本的复期望风险泛函、复经验风险泛函以及复经验风险最小化原则的定义,给出并证明了机会空间上受噪声影响的复hybrid样本的学习理论的关键定理.

Hybrid手术治疗颅内复杂动脉瘤的围术期护理

目的探讨Hybrid手术治疗颅内复杂动脉瘤的围术期护理。方法回顾性分析2011年7月～2012年4月39例行Hybrid手术治疗颅内复杂动脉瘤的39例患者的临床资料,总结动脉瘤发生部位、护理方法、并发症的预防和处理,探讨其护理重点。结果39例患者发生脑血管痉挛4例,3例好转出院,1例持续昏迷自动出院;水电解质紊乱9例,经治疗后电解质恢复正常;肺部感染4例,3例经抗感染治疗后痊愈,1例伴发呼吸衰竭死亡;再出血1例,行急诊开颅手术后好转出院。结论压颈试验、血压管理、水电解质紊乱的观察和护理是重点,做好围术期护理能有效改善患者预后和转归。

基于复数神经网络的双视角视觉转角测量方法

为改善单视觉的转角测量方法容易受到环境或系统随机干扰的不稳定性,提出了一种基于复数神经网络的双视角视觉转角测量方法。人为进行特征提取,并评估其与角度的相关性和单调性来进行特征筛选。为解决0°和360°标签数值差距大对训练结果的影响,将角度用欧拉公式表示,并构建复数输入,复数输出的复数神经网络来进行转角计算。实验结果显示,这种测量方法在测量准度上有显著提升,相比基于深度神经网络的单视角方法,其平均误差降低0.322°,均方根误差降低0.64°,在不同环境测试集上保持高效性能。该模型在保持传统数学模型的约束和稳定性的前提下,充分利用了双视角对于环境干扰的鲁棒性,结合复数神经网络对于角度标签的强大拟合能力,提高了径向视觉角度测量的准确性和稳定性。

多类型地震仪器联合采集技术在复杂区的应用与展望

近年来,随着油气勘探程度的不断深入,国内各探区开展了一系列针对复杂地表、复杂地下地质目标的技术攻关,而以“两宽一高”为特征的大道数高精度物探技术是重要手段之一。在实际勘探作业过程中,由于实时带道能力、复杂地表适应性差等方面的限制,传统有线地震仪器已无法满足大道数、高效率和高质量地震数据采集的需求。新近出现的无缆式地震仪器采用的自主采集、数据本地存储工作方式可不受实时采集道数的限制,且能够很好地解决复杂地表区的排列布设难度大的问题,但无法实现采集数据的现场实时下载和质控,数据交付相对滞后。为突破传统使用单一类型地震仪器带来的效率和质量瓶颈,本文给出基于卫星授时的多类型地震仪器联合采集技术的工作原理、作业流程和技术关键点,并以渤海湾盆地冀中坳陷探区的某项目为例阐述该勘探作业新方式的技术优势和应用效果。最后,结合地震勘探需求对多类型地震仪器联合采集技术的应用前景进行了讨论和总结。