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Design of full-connected hybrid precoding based on an equivalent channel in millimeter-wave massive MIMO system
Published 2021-01-01“…In order to improve the performance of hybrid precoding scheme based on fully connected structure in millimeter-wave massive MIMO system, a hybrid precoding scheme based on an equivalent channel with two-step design method was proposed.Firstly, the equivalent channel was constructed by combining the analog precoding matrix at the transmitter, the analog combining matrix and the channel matrix at the receiver, and the analog part of the transceiver was designed to maximize the equivalent channel gain.Furthermore, the least squares criterion was applied to derive the digital precoding matrix and the digital combination matrix column by column to design the digital part of the transceiver.Simulation results show that the proposed algorithm can approximate the optimal digital precoding scheme and has lower complexity and stronger fault tolerance.…”
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462
Vibration Analysis and Design of the Oilcan Spraying Robot
Published 2017-01-01“…At last,the modeling and analysis of booms and the fixed column as the key structure of the spraying robot are carried out. …”
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463
A divisibility property of binomial coefficients viewed as an elementary sieve
Published 1981-01-01“…Mann and Shanks have proved that in a 2-shifted array a column number c>1 is prime if and only if every entry in the c-th column is divisible by its row number. …”
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464
Establishment of the Quantitative Analysis of Multiindex in Euphorbia lathyris by the Single Marker Method for Euphorbia lathyris Based on the Quality by Design Concept
Published 2021-01-01“…The methanol/water ratio, column temperature, detection wavelength, flow rate, and injection volume were 60 : 40, 30°C, 275 nm, 1.0 mL/min, and 10 μL, respectively. …”
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465
A Validated RP-HPLC Method for the Determination of Recombinant Human Insulin in Bulk and Pharmaceutical Dosage Form
Published 2010-01-01“…The column temperature was 40 °C, the flow rate was 1 mL/min and detection was performed at 216 nm. …”
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466
Seismic performance evaluation of multi-storied RC structures by nonlinear static analysis
Published 2025-03-01“…The ductility of flat slab with drop panel is increased at rates of 31.2 % and 37.1 % from the flat plate with edge beam and beam-column supported framing system, respectively. The response reduction factors for the flat plate with edge beam, flat slab with drop panel, and beam-column supported framing systems are found to be 5.4, 5.9, and 6.7, respectively. …”
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467
Simulation and experimental study on energy absorption components of advanced hydraulic support for mining
Published 2024-12-01“…Sufficient time is provided for the opening of the support column safety valve. The application of aluminum foam filled multi-cell square tube reduces the risk of cylinder explosion of the support column and improves the impact resistance of the column.…”
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468
Enhanced bed shear stress and mixing in the tidal wake of an offshore wind turbine monopile
Published 2025-01-01“…The wake is hypothesised to enhance seabed stress and water column turbulence mixing, thereby affecting seabed mobility, water column stratification and the transport of nutrients and oxygen and resulting in ecological impacts. …”
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469
Research on the construction method of quasi-complementary sequence sets for peak-to-average power ratio reduction of multicarrier signal
Published 2023-10-01“…To solve the problem of limited number of sequences in the mutually orthogonal complementary code set and high peak-to-average power ratio (PAPR) in MC-CDMA system, a construction of asymptotically optimal a periodic binary QCSS with low column vector PAPR was proposed.The obtained QCSS with asymptotically optimal parameters had more sequences than the existing QCSS due to the designed mapping set.The QCSS based on the orthogonal Golay sequence set had column vector PAPR of at most 2.Experimental simulation results show that the constructed sequence sets can effectively reduce the time-domain MC-CDMA signal PAPR to 3 dB and have good bit error rate performance.…”
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470
Contact Stress Analysis of a Kind of Rectangular Straight Rack Connecting Structure
Published 2015-01-01“…A kind of rectangular straight rack connecting structure is proposed for tight junction between movable beam and stand column,so as to ensure the load bearing entirety of movable beam and stand column in each stroke position. …”
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471
Stability Indicating Analytical Method Development and Validation of Efavirenz Quantification by High Performance Liquid Chromatographic Technique
Published 2011-01-01“…Selected mobile phase is a combination of 50 volume of acetonitrile and 50 volume of 0.86% w/v solution of ammonium dihydrogen phosphate, pH adjusted to 3.0 with orthophosphoric acid. Optimized column is a stainless steel column packed with base deactivated octa decylsilyl silica gel and at 252 nm wavelength. …”
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472
Study of Hydrodynamic Dispersion Laws in Homogeneous and Heterogeneous Soil
Published 2022-01-01“…To investigate the general laws of solute transport in homogeneous and heterogeneous soil,this study conducts column experiments in the laboratory to observe and monitor hydrodynamic dispersion under different conditions.The measured breakthrough curves of solute are fitted and analyzed by the classical advection-diffusion equation (ADE).The results reveal that the solute concentration has little effect on the hydrodynamic diffusion coefficient in homogeneous soil;however,the flow rate of solute transport can promote hydrodynamic diffusion,namely that a higher flow rate can lead to a larger hydrodynamic diffusion coefficient,and the breakthrough curves can be completed faster.There is a positive correlation between the hydrodynamic diffusion coefficient and the mean particle size of the sand at a certain flow rate.In addition,the scale effect is prominent in the solute transport process in soil;generally,the hydrodynamic diffusion coefficient increases with the traveling distance.Compared with the case of homogeneous soil,the heterogeneity and different layered structures of layered soil have a more significant influence on hydrodynamic dispersion.…”
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473
Fixed-Bed Adsorption for the Removal of Iron and Manganese onto Palm Fruit Bunch and Maize Cob
Published 2003-03-01“…The sorption of iron and manganese onto palm fruit bunch and maize cob in a fixed-bed column was studied. The influence of process variables such as the bed height, the solution flow rate and the percentage breakthrough were investigated. …”
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474
The Influence of the Concentration of Cyclohexane Radicals Bonded with an Si100 Silica Gel Surface upon the Retention of Some Hydrocarbons in Gas Chromatography
Published 2000-02-01“…It was concluded that the retention of some compounds was increased on the column packed with an adsorbent of 1.35 μmol/m 2 concentration relative to that measured on the column packed with the unmodified silica gel. …”
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Comparison of Kendall Inspection in Trend Analysis of Hydro-sequence
Published 2005-01-01Get full text
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