4-D parameter estimation of narrowband sources based on parallel factor analysis

A novel algorithm is presented in this paper to jointly estimate frequency, two-dimensional （2-D） direction-of-arrival （DOA）, and range of near-field narrowband sources. The proposed method extends the parallel factor （PARAFAC） analysis model from the common data- and subspace-domain to the cumulant one, and forms three-way arrays by using the five cumulant matrices obtained from the array outputs, and analyzes the uniqueness of low-rank decomposition of the three-way arrays, then jointly estimates source parameters via the low-rank decomposition. In comparison with the conventional methods, the proposed method alleviates the loss of the array aperture, and avoids pairing parameters. What is more important, this algorithm can deal with mixed far-field and near-field sources. Finally, the simulation results validate the performance of the proposed method.     

A new bone repair scaffold combined with chitosan/ hydroxyapatite and sustained releasing icariin

Icariin, a plant-derived flavonol glycoside, has been proved as an osteoinductive agent for bone tissue engineering. A new bone repair scaffold was generated by thorough mixing of icariin and chitosan/ hydroxyapatite （icariin-CS/HA） using freeze-drying technigue. Characteristics of morphology, mechanical properties, biocompatibility, drug release behavior and bone repair abilities in vivo were evaluated. The results show that drug loading process of icariin did not affect physical structure of CS/HA composite significantly but decreased mechanical properies of CS/HA composite, which happened with a high dosage; icariin-CS/HA had favorable cell compatibility and promoted osteogenic differentiation of hBMSCs; the controlled release of icariin was satisfactory and the release retained after 90 d in vitro. In addition, icariin-CS/HA scaffolds had favorable osteoconduction and osteoinduction in vivo, and could fill bone defect sites and stimulate newborn bone tissues formation at early stage. On the basis of these data, icariin-CS/HA is believed to be an optical bone repair scaffold for tissue engineering.     

Fast separation of intact proteins with high resolution under high sample loading using non-porous RPLC packings

A new approach for separation of intact proteins with high resolution, high speed and high sample loading (three highs) by non-porous packings in high performance liquid chromatography is presented.A chromatographic cake having larger diameter than its thickness is firstly employed to completely separate 1.0 and 40 μg of the mixture of 7 standard proteins within 1 min un-der conventional chromatographic conditions.Also, 0.5 mg of the mixture was almost completely separated within 1 min, accom-plishing the t...     

浅析工程造价的有效控制

在工程项目中,如何正确地编制工程造价对其实施有着决定性的作用。为了适应当前社会主义市场经济体制和建设工程项目全过程管理的需要,应科学规划和合理确定建设工程造价,提高建设工程造价编制水平,客观真实地反映建设工程的实际造价。     

Selection of the best initial orbital elements of satellite based on fuzzy integration evaluation method

1 .FOREWORDAt present ,the data sources to be used by the sat-ellite TT&C ( Tracking, Telemetry and Control)center of Chinain determininginitial orbits includethe telemetry data and tracking data of rockets andsatellites .In the telemetry data ,there are data atseconds nodes and shutdown nodes of rockets ,andthe onboard GPS data of rockets and satellites .InTT&C missions , many TT&C stations with dif-ferent TT&C equipment are often utilized duringinjection phases . Therefore ,there …     

Grid architecture model of network centric warfare

1.INTRODUCTIONOGSA[1,2,4,5,7]integrates key grid technologies withWebservices mechanisms to create a distributed sys-temframework based around the grid service.OGSAdefines mechanisms for creating,managing,and ex-changing information among entities called grid ser-vices.Succinctly,a grid service is a Web service thatconforms to a set of conventions(interfaces and be-haviors)that define howa client interacts with a gridservice.As the embodi ment of the information warfare,NCW[2,3,6]is a…     

Robust Disaster Recovery System Model

0 IntroductionAsR eas ekaerych p raonjdec tDe ovfe ltohpem 1e0ntth P Fliavne o fY eCahrin Haig,ha-nTie cmh-portant E-government Experi mental and DemonstrationProject (EEDP) must be able to bear heavy disasters .Based onthe analysis of many kinds of disasters and dis-aster recovery systems (DRS) , we presented a new Ro-bust Disaster Recovery System Model (RDRSM) . Underthe guidance of RDRSM, DRS of EEDP has been con-structed and entered test run condition, which also veri-fiedt…     

顿悟从何而来？

一些漫画里，主人公突发奇想的表现方法是脑袋上亮起一盏灯泡，而点亮这盏灯的“电源”到底在哪里？     

设计人类心脏的替换装置

据马里兰州Bethesda市国立心、肺和血液研究所估计,人造心脏可能是每年25,000人的救命装置。几个研究小组都已制造了左心室辅助装置(取代1个心室泵血功能)和完整的人造心脏(取代2个心室)的实用原型。如果这些设计得到政府批准供临床使用的话,仍然需要排除许多工程障碍。     

Molecular orbital study on antiferromagnetic coupling mechanism in a silver (I) complex

Typically, magnetic interactions between paramagnetic centers through diamagnetic metal ions are negligibly small or weakly antiferromagnetic[1]. However, it has been proven that some metal complexes with organic radical ligands, in which the metal ions are diamagnetic, mediate substantial magnetic interactions. For example, metal complexes with semiquinones[2―4] show that a variety of magnetic interactions depend on metal ions and coordina-tion geometries, and the magnitude of the magnetic i…