Good Anti-jamming Ability Research Articles

Establishment and Application of a 42-plex Microhaplotype Assay in Forensic Genetics.

To establish and forensically verify a 42 microhaplotypes (mircohaps, MHs) multiplex assay system based on next-generation sequencing (NGS), and to explore the application value of this system in the practice of forensic genetics. A total of 42 highly polymorphic MHs were selected from previous studies, and sequenced by the MiSeq FGxTM platform to verify the repeata-bility, sensitivity, specificity, stability, and mixture analysis ability of the detection system. Through population genetic investigation of 102 unrelated Chinese Han individuals in Liyang City, Jiangsu Province, China, the application value of this system in forensic genetics was evaluated. The sequencing repeatability of the 42-plex MHs assay was 100% and the sensitivity was as low as 0.062 5 ng. The system had the ability to withstand the interference of indigo (≤2 500 ng/μL), humic acid (≤9 ng/μL), hemoglobin(≤20 μmol), and urea (≤200 ng/μL) and to detect mixtures of 2 people (1∶19), 3 people (1∶1∶9) and 4 people (1∶1∶1∶9). Based on 102 individual data, the combined power of discrimination and the combined power of exclusion were 1-3.45×10-30 and 1-3.77×10-11, respectively, and the average effect value of alleles was 2.899. The 42-plex MHs assay was successfully established in this study and this system has high repeatability and sensitivity, good anti-jamming ability and mixture analysis ability. The 42 MHs are highly polymorphism and have good application value in individual identification and paternity testing.

Stability Study and Simulation of Quadruped Robots with Variable Parameters.

Walking stability is one of the key problems restricting the development of quadruped robots. Two new kinds of variable parameter quadruped robots with high stability were proposed. The two groups of variable parameter models were applied to quadruped robots with the full elbow joint or elbow joint for front legs and knee joint for back legs, respectively, and the stability of their linear motion under different variable parameters was deeply studied by Recurdyn. The quadruped robots with elbow joint for front legs and knee joint for back legs displayed good antijamming ability to lateral impact. According to the rigid-flexible simulation experiment, the largest force occurred in the knee joint during the movement of the quadruped robot. This provided a theoretical basis for the design of real quadruped robots.

The hierarchically nitrogenous magnetic porous carbon prepared by ZIF-67 through mesoporous silica-protected calcination for rapid Cr(VI) removal

A novel magnetic composite with hierarchically porous nature is prepared by a facile synthetic strategy for the highly toxic chromium (Cr(VI)) removal. The magnetic NMPC@mSiO 2 with defined mesoporous shell is successfully fabricated by one-step carbonization of ZIF-67@mSiO 2 , which is prepared through a simple one-pot method. Benefiting from the protection of mSiO 2 during pyrolysis process, NMPC@mSiO 2 -800 owns high specific surface area, hierarchically porous structure and increased C–N content. It shows an excellent Cr(VI) removal performance with an adsorption capacity rising to 158.11 mg·g −1 from 78.60 mg·g −1 (NMPC-800). Moreover, the prepared NMPC@mSiO 2 -800 exhibits antijamming capability for Cl −1 /SO 4 2− with a negligible adverse impact on Cr(VI) removal. The kinetic studies show that the Cr(VI) removal on NMPC@mSiO 2 -800 confirms to pseudo-second-order model equipped with a relatively large adsorption rate constant, revealing the ability to quickly adsorb Cr(VI). The thermodynamic parameters manifest Cr(VI) adsorption is spontaneous and endothermic. Besides, the NMPC@mSiO 2 -800 can be quickly recovered from the system due to the magnetic porous carbon. Herein, NMPC@mSiO 2 -800 has a broad application prospect in Cr(VI) removal due to its excellent adsorption capacity, good antijamming ability, high adsorption rate and easy magnetic separation. • The hierarchically nitrogenous porous carbon is prepared by mSiO 2 -protected calcination. • The Cr(VI) adsorption capacity of NMPC@SiO 2 -800 is improved due to mSiO 2 coating. • NMPC@mSiO 2 -800 achieves more than 90% equilibrium adsorption capacity in 5 min. • The adsorption process is dominated by reduction.

A multivariate luminescent MOF based on dye covalently modification serving as a sensitive sensor for Cr2O72−, CrO42− anions and its applications

In this work, a multivariate metal-organic framework (MOF) (9-1-MOF-253-NH2) with mixed ligands is firstly constructed through solid solution approach under solvothermal conditions. Then, a Rhodamine B (RhB)-functionalized compound (RhB@9-1-MOF-253-NH2) with bright red fluorescence is obtained by covalent post-synthetic modification (PSM). Due to possessing efficient and stable luminescent properties and robust framework, the sensing application of this material (RhB@9-1-MOF-253-NH2) is explored. Remarkably, the water-tolerance and reusable RhB@9-1-MOF-253-NH2 can specifically recognize and detect Cr2O72−/CrO42− based on fluorescence quenching mechanism. Moreover, the sensor shows many excellent sensing performances for Cr2O72−/CrO42− including high selectivity, good anti-jamming ability, great sensitivity (0.863 μM and 0.789 μM, respectively), and fast response speed. More importantly, the RhB@9-1-MOF-253-NH2 can act as a fluorescent probe using for the detection of the Cr2O72−/CrO42− content in milk and tap water samples with good accuracy and sensitivity. Furthermore, the possible sensing mechanisms of RhB@9-1-MOF-253-NH2 towards Cr2O72−/CrO42− are investigated in detail.

Research on hardware-in-the-loop simulation of single point suspension system based on fuzzy PID

The stability control of maglev trains is one of the core problems in the research of maglev train technology and the realisation of this goal is of the great scientific value in the field of magnetic levitation. Based on this, the research on the suspension control strategy of single point maglev system is founded and the control strategy is verified by experiments on Magnetic Levitation Ball System (MLBS). Aiming at the structure of multi-group independent control system of maglev train suspension frame, in order to improve the overall stability control ability of the suspension frame, the coupling relationship between the subsystems is established by introducing the suspension response deviation compensator. Finally, the effect of single point suspension control system is discussed and the cooperative control of suspension frame is carried out on MATLAB. Simulation and analysis show that each subsystem has good anti-jamming ability and the suspension system realises the balanced and stable control under different interference signals, which provides a certain reference value for further study of maglev train suspension control.

Research on hardware-in-the-loop simulation of single point suspension system based on fuzzy PID

The stability control of maglev trains is one of the core problems in the research of maglev train technology and the realisation of this goal is of the great scientific value in the field of magnetic levitation. Based on this, the research on the suspension control strategy of single point maglev system is founded and the control strategy is verified by experiments on Magnetic Levitation Ball System (MLBS). Aiming at the structure of multi-group independent control system of maglev train suspension frame, in order to improve the overall stability control ability of the suspension frame, the coupling relationship between the subsystems is established by introducing the suspension response deviation compensator. Finally, the effect of single point suspension control system is discussed and the cooperative control of suspension frame is carried out on MATLAB. Simulation and analysis show that each subsystem has good anti-jamming ability and the suspension system realises the balanced and stable control under different interference signals, which provides a certain reference value for further study of maglev train suspension control.

Analysis and Research on the Structure Selection of BeiDou Navigation Array Antenna Based on Optimized PI Algorithm

To overcome the disadvantages of the traditional power inversion algorithm, which has obvious suppression effect on strong interference signals but unobvious effect on suppression of weak interference signals, a matrix decomposition method is proposed to extract the interference sub-matrix and noise sub-matrix, so that the power inversion algorithm can be adopted to weaken and filter out the signals in the case of weak interference. Through the optimized power inversion algorithm, the interference signal can be weakened obviously at the antenna receiving end, and the quality of the effective signal received by the antenna can be improved significantly. Afterwards, the algorithm was used to carry out MATLAB simulation in space based on the anti-jamming performance of different array models, which determined the anti-jamming antenna array structure as a uniform matrix and optimized the array structure. The simulation results show that the optimized power inversion algorithm can filter strong and weak interference better, and the anti-jamming performance is better under different array models and two kinds of interferences. Through comparative analysis, it is concluded that the four elements have the best interference suppression effect in uniform circular array structure, which provides an important reference for the selection of antenna array in adaptive interference suppression hardware structure. At the same time, the BeiDou four-element adaptive circular array antenna, as an important part of intelligent geological disaster monitoring and early warning system, has good anti-jamming ability.

Intelligent Computing for Extended Kalman Filtering SOC Algorithm of Lithium-Ion Battery

The accurate estimation of battery state of charge (SOC) is an important function of the battery management system, and the precise state of battery is estimated makes for the stability of the system. Based on the working characteristics of lithium-ion batteries, the article which used intelligent computing method establishes the mathematical model of the lithium-ion power battery by using the Thevenin model to accurately estimate the battery SOC. Besides, this paper adopts extended Kalman filtering algorithm based on an ampere-hour integral method and the open circuit voltage method for the estimation of battery SOC. Finally in simulation and hardware, the algorithm is verified. The simulation results show that the intelligent computing model can well reflect dynamic and static characteristics of the battery and the extended Kalman filtering algorithm has better estimation accuracy and can meet the system requirements. Similar to the simulation, hardware experiments also show that the algorithm has the high precision and a good anti-jamming ability.

Two novel pyrazole-based chemosensors: “naked-eye” colorimetric recognition of Ni2+ and Al3+ in alcohol and aqueous DMF media

Sensors Pry-Flu and Pry-R6G were found to have a wide pH range (4–12), good anti-jamming ability and can be reused. And the sensors Pry-Rhy and Pyr-R6G could be quite useful for the fabrication of sensing devices with fast and convenient detection of Ni2+ and Al3+.

Design of a High Resolution and Dual-Path Optical Water Turbidimeter

We have designed a high resolution and dule-path optical turbidimeter. The right angle scatted light turbidimeter is mainly for water in low turbidity levels, especially for drinking water. Mechanical design of the optoelectronic receiving room and the realizing circuit for modulation and demodulation are described in detail. To achieve good linearity in the measuring range from 0 to 5 NTU, pulse width modulation (PWM) and demodulation techniques are proposed, in this way, low temperature-drift and good anti-jamming ability can be obtained without the interference of background light. To improve the precision, the ratio algorithm which measures the ratio of the scattered light and reflected light is introduced in a dule-path optical system so that the interference of light emission can be eliminated effectively. Through the analysis and comparison of the experimental results, the linearity is improved by the ratio algorithm with a correlation coefficient for about 0.99932.

Study of Portable Shaft Power Measurement System

During the development of vehicle transmission system, in order to obtain operating state of transmission system, thoroughly study control scheme of transmission system, it needs to acquire, save, display parameters such as torque and speed of shaft. The measurement principles of torque and speed were analysed. A portable measurement system of torque and speed based on virtual instrument was designed, which can be used to measure toque and speed conveniently and accurately. Vehicle experiments were carried out using this system. It shows experimentally that the system has high accuracy and good anti-jamming ability, and the operation is simple. The system can quickly show the dynamic and static characteristics of vehicle shafts operating state and describes directly with the graph form.