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| 1 | Concentration of circulating microparticles:a new biomarker of acute heart failure after cardiac surgery with cardiopulmonary bypass显示文摘Acute heart failure(AHF)is a severe complication after cardiac surgery with cardiopulmonary bypass(CPB).Although some AHF biomarkers have been used in clinic,they have limitations when applied in the prediction and diagnosis of AHF after cardiac surgery with CPB,and there are still no effective and specific biomarkers.We and other researchers have shown that circulating microparticles(MPs)increased in a variety of cardiovascular diseases.However,whether the concentration of circulating MPs could be a new biomarker for AHF after cardiac surgery remains unknown.Here,90 patients undergoing cardiac surgery with CPB and 45 healthy subjects were enrolled.Patients were assigned into AHF(n=14)or non-AHF(n=76)group according to the diagnosis criteria of AHF.The concentrations of circulating MPs were determined before,as well as 12 h and 3 days after operation with nanoparticle tracking analysis technique.MPs concentrations in patients before surgery were significantly higher than those of healthy subjects.Plasma levels of MPs were significantly elevated at 12 h after surgery in patients with AHF,but not in those without AHF,and the circulating MPs concentrations at 12 h after surgery were higher in AHF group compared with non-AHF group.Logistic regression analysis indicated that MPs concentration at postoperative 12 h was an independent risk factor for AHF.The area under receiver operating characteristic curve for MPs concentration at postoperative 12 h was 0.87 and the best cut-off value is 5.20×10~8 particles mL~(–1)with a sensitivity of 93%and a specificity of 70%.These data suggested that the concentration of circulating MPs might be a new biomarker for the occurrence of AHF after cardiac surgery with CPB. | Yuquan Li Haoxiang Yuan Caiyun Chen Chao Chen Jian Ma Yating Chen Yan Li Yupeng Jian Donghong Liu Zhijun Ou Jingsong Ou | 2021 | Science China(Life Sciences)2021，64，1： | 3 |
| 2 | Precise Background Noise Power Estimate for Echo Cancellation显示文摘The reconstruction of background noise from an error signal of an adaptive filter is a key issue for developing Variable Step-Size Normalized Least Mean Square (VSS-NLMS) algorithm in the context of Echo Cancellation (EC). The core parameter in this algorithm is the Background Noise Power (BNP); in the estimation of BNP, the power difference between the desired signal and the filter output, statistically equaling to the error signal power, has been widely used in a rough manner. In this study, a precise BNP estimate is implemented by multiplying the rough estimate with a corrective factor, taking into consideration the fact that the error signal consists of background noise and misalignment noise. This corrective factor is obtained by subtracting half of the latest VSS value from 1 after analyzing the ratio of BNP to the misalignment noise. Based on the precise BNP estimate, the PVSS-NLMS algorithm suitable for the EC system is eventually proposed. In practice, the proposed algorithm exhibits a significant advantage of easier controllability application, as prior knowledge of the EC environment can be neglected. The simulation results support the preciseness of the BNP estimation and the effectiveness of the proposed algorithm. | Wen Haoxiang Lai Xiaohan Chen Longdao | 2012 | China Communications2012，9，11： | 2 |
| 3 | Towards unlocking high-performance of supercapacitors: From layered transition-metal hydroxide electrode to redox electrolyte.显示文摘Both energy density and power density are crucial for a supercapacitor device, where the trade-off must be made between the two factors towards a practical application. Herein we focus on pseudocapacitance produced from the electrode and the electrolyte of supercapacitors to simultaneously achieve high energy density and power density. On the one hand, layered transition metal hydroxides(Ni(OH)2 and Co(OH)2) are introduced as electrodes, followed with exploration of the effect of the active materials and the substrate on the electrochemical behavior. On the other hand, various redox electrolytes are utilized to improve the specific capacitance of an electrolyte. The roadmap is to select an appropriate electrode and a dedicated electrolyte in order to achieve high electrochemical performance of the supercapacitors. | WANG HaoXiang ZHANG Wei CHEN Hong ZHENG WeiTao | 2015 | Science China(Technological Sciences)2015，58，11： | 1 |
| 4 | An improved PNLMS algorithm for sparse impulse response identification显示文摘 | Wen Haoxiang Lai Xiaohan Chen Longdao | 2013 | Journal of ShangHaiJiaotong University (Science)2013，18，6： | 1 |
| 5 | OTFS Modulation and PAPR Reduction for IoT-Railways显示文摘The internet of things(IoT)has been widely considered to be integrated with high-speed railways to improve safety and service.It is important to achieve reliable communication in IoT for railways(IoT-R)under high mobility scenarios and strict energy constraints.Orthogonal time frequency space(OTFS)modulation is a two-dimensional modulation technique that has the potential to overcome the challenges in high Doppler environments.In addition,OTFS can have lower peak-to-average power ratio(PAPR)compared to orthogonal frequency division multiplexing,which is especially important for the application of IoT-R.Therefore,OTFS modulation for IoT-R is investigated in this paper.In order to decrease PAPR of OTFS and promote the application of OTFS modulation in IoT-R,the peak windowing technique is used in this paper.This technique can reduce the PAPR of OTFS by reducing the peak power and does not require multiple iterations.The impacts of different window functions,window sizes and clipping levels on PAPR and bit error rate of OTFS are simulated and discussed.The simulation results show that the peak windowing technique can efficiently reduce the PAPR of OTFS for IoT-R. | Huichao Shang Ruifeng Chen Haoxiang Zhang Guoyu Ma Ruisi He Bo Ai Zhangdui Zhong | 2023 | China Communications2023，20，1： | 1 |
| 6 | Ionic-liquid-assisted synthesis of YF3 with different crystalline phases and morphologies 显示文摘 | Zhong Haoxiang Hong Jianming Cao Xiaofeng Chen Xuetai Xue Ziling | 2009 | Materials Research Bulletin2009，44，3： | 1 |
| 7 | NAS4RRAM: neural network architecture search for inference on RRAM-based accelerators显示文摘The RRAM-based accelerators enable fast and energy-efficient inference for neural networks.However, there are some requirements to deploy neural networks on RRAM-based accelerators, which are not considered in existing neural networks.(1) Because the noise problem and analog-digital converters/digitalanalog converters(ADC/DAC) affect the prediction accuracy, they should be modeled in networks.(2) Because the weights are mapped to the RRAM cells, they should be quantized, and the number of weights is limited by the number of RRAM cells in the accelerator. These requirements motivate us to customize the hardware-friendly network for the RRAM-based accelerator. We take the idea of network architecture search(NAS) to design networks with high prediction accuracy that meet the requirements. We propose a framework called NAS4RRAM to search for the optimal network on the given RRAM-based accelerator. The experiments demonstrate that NAS4RRAM can apply to different RRAM-based accelerators with different scales. The performance of searched networks outperforms the manually designed ResNet. | Zhihang YUAN Jingze LIU Xingchen LI Longhao YAN Haoxiang CHEN Bingzhe WU Yuchao YANG Guangyu SUN | 2021 | Science China(Information Sciences)2021，64，6： | 0 |
| 8 | Ultrafine RuO_(2) nanoparticles/MWCNTs cathodes for rechargeable Na-CO_(2) batteries with accelerated kinetics of Na_(2)CO_(3) decomposition显示文摘Na-CO_(2) batteries have attracted extensive attention due to their high theoretical energy density(1125 Wh/kg),efficient utilization of CO_(2),and abundant sodium resources.However,they are trapped by the sluggish decomposition kinetic of discharge products (mainly Na_(2)CO_(3)) on cathode side during the charging process.Here we prepared a series of nano-composites composed of RuO_(2) nanoparticles in situ loaded on activated multi-walled carbon nanotubes (RuO_(2)@a-MWCNTs) through hydrolyzing reaction followed by calcination method and used them as cathode catalysts to accelerate the decomposition of Na_(2)CO_(3).Among all catalysts,the RuO_(2)@a-MWCNTs with appropriate ratio of RuO_(2)(49.7 wt%) demonstrated best stability and rate performance in Na-CO_(2) batteries,benefiting from both high specific surface area (160.3 m^(2)/g) and highly dispersed RuO_(2) with ultrafine nanostructures (~2 nm).At a limited capacity of 500 mAh/g,Na-CO_(2) batteries could afford the operation of over 120 cycles at 100 mA/g,and even at the current density to 500 mA/g,the charge voltage was still lower than 4.0 V after 40 cycles.Further theoretical calculations proved that RuO_(2) was the catalytically active center and contributed to the decomposition of Na_(2)CO_(3) by weakening the C=O bond.The synergetic functions of high specific surface(CNTs) and high catalytic activity (RuO_(2)) will inspire more progress on metal-CO_(2) batteries. | Zhenzhen Wang Yichao Cai Youxuan Ni Yong Lu Liu Lin Haoxiang Sun Haixia Li Zhenhua Yan Qing Zhao Jun Chen | 2023 | Chinese Chemical Letters2023，34，3： | 0 |
| 9 | Performance Improvement of a Centrifugal Compressor for the Fuel Cell Vehicle by Tip Leakage Vortex Control显示文摘Heightened interests have been laid at the preliminary design and optimization of the centrifugal compressor for the fuel cell vehicle.The centrifugal compressor for fuel cell vehicle is driven by a high-speed motor;however,the limit of the motor speed makes the flow passage of the impeller long and narrow,which leads to a serious tip leakage loss.Serious tip leakage loss deteriorates the compressor performance.In this paper,3-D numerical simulations were carried out with the aim of investigating the tip leakage loss in a prototype centrifugal compressor for a 100 kW fuel cell stack.The results revealed that the mixing loss caused by the interaction between the tip leakage vortex and the downstream tip leakage flow contributed to the major part of the tip leakage loss.The path of the tip leakage vortex almost followed the streamwise direction,while the downstream tip leakage flow exhibited strong circumferential momentum,which referred to the fact that they were nearly orthogonal.Therefore,a flow control approach,which was realized by enhancing the blade loading around the leading edge of blade tips in this paper,was proposed to decrease the interaction angle between the tip leakage vortex and the downstream tip leakage flow and then mitigate mixing loss by changing the flow direction of the tip leakage vortex.The results showed a smaller interaction angle was achieved in the optimized impeller compared with the baseline one.Meanwhile,the efficiency was also improved by 1.30%at design condition and the maximum efficiency improvement could be up to 10%at large mass flow condition of 92000 r/min.Being manufactured and tested,the optimized compressor was proved to achieve an isentropic efficiency of 75.84%at design condition. | CHEN Haoxiang ZHUGE Weilin ZHANG Yangjun MA Xuelong TAO Lin | 2021 | Journal of Thermal Science2021，30，6： | 0 |
| 10 | Real-Time Instability Detection of Centrifugal Compressors Based on Motor Speed Measurements显示文摘Flow instability in the centrifugal compressor should be detected and avoided for stable and safe operation.Due to the popularity of electric centrifugal compressors,instability detection could be achieved by measuring motor signals instead of traditional aerodynamic signals.In this paper,the feasibility of instability detection by motor signals(i.e.rotating speed and phase current)was studied experimentally.The physical structure and control method of the electric centrifugal compressor were discussed to reveal the potential of instability detection by motor signals.Dynamic pressure signals and motor signals measured during unsteady experiments were analyzed in the time domain and frequency domain.Characteristics of these signals were then compared under different operating conditions to indicate the feasibility of instability detection by motor signals.Finally,the ability of Short-Time Fourier Transform(STFT)of rotating speed signals in real-time instability detection was discussed.Results showed that the rotating speed signal is a good alternate for instability detection in spite of signal distortion,while the phase current signal can only detect surge due to the low resolution of the controller.Based on the variations of the amplitude and frequency of rotating speed signals,the real-time instability can be captured accurately by STFT with a window size of 0.5 s.Besides,the interference caused by the controller can be removed by STFT. | CHEN Haoxiang ZHUGE Weilin QIAN Yuping ZHANG Yangjun LIU Hongdan | 2023 | Journal of Thermal Science2023，32，1： | 0 |
| 11 | Preparation and characterization of M_(1)-N_(x)-C_(y)based single atom catalysts for environmental applications显示文摘Single atom catalysts(SACs)have become the frontier research fields in catalysis.The M_(1)-N_(x)-C_(y)based SACs,wherein single metal atoms(M1)are stabilized by N-doped carbonaceous materials,have provided new opportunities for catalysis due to their high reactivity,maximized atomic utilization,and high selectivity.In this review,the fabrication methods of M_(1)-N_(x)-C_(y)based SACs via support anchoring strategy and coordination design strategy are summarized to help the readers understand the interaction mechanism of single atoms and support.Then,characterization technologies for identifying single metal atoms are presented.Besides,the environmental applications including management of harmful gases,water purification are discussed.Finally,future opportunities and challenges for preparation strategies,mechanisms and applications are concluded.We conclude this review by emphasizing the fact that M_(1)-N_(x)-C_(y)based SACs has the potential to become an important candidate for solving current and future environmental pollution problems. | Xinjiang Hu Daixi Zhou Hui Wang Wenlong Zhang Haoxiang Zhong Yongsheng Chen | 2023 | Chinese Chemical Letters2023，34，8： | 0 |
| 12 | Toward a unified information framework for cell atlas assembly显示文摘Cells are the basic structural and functional unit of the human body.Virtually all cells of a human body possess the same genome,but they exhibit colorful heterogeneities in phenotypes and functions.The heterogeneities include rich paerns and variabilities in the transcriptomic,epigenomic and proteomic features of the cells.Building an atlas of human cells with the biomolecular properties of all cell types in all organs is essential for understanding the human body;and will provide a fundamental reference for studies on human health and diseases. | Sijie Chen Yanting Luo Haoxiang Gao Fanhong Li Jiaqi Li Yixin Chen Renke You Hairong Lv Kui Hua Rui Jiang Xuegong Zhang | 2022 | National Science Review2022，9，3： | 0 |
| 13 | Flow Loss Mechanism in a Supercritical Carbon Dioxide Centrifugal Compressor at Low Flow Rate Conditions显示文摘With the advantages of high efficiency and compact structure,supercritical carbon dioxide(sC02)Brayton cycles have bright prospects for development in energy conversion field.As one of the core components of the power cycle,the centrifugal compressor tends to operate near the critical point(304.13 K,7.3773 MPa).Normally,the compressor efficiency increases as the inlet temperature decreases.When the inlet temperature is close to the critical point,the density increases sharply as the temperature decreases,which results in quickly decreasing of volume flow rate and efficiency reducing.The flow loss mechanism of the sCO_(2) compressor operating at low flow rate is studied in this paper.Computational fluid dynamics(CFD) simulations for sCO_(2)compressor were carried out at various inlet temperatures and various mass flow rates.When the sCO_(2)compressor operates at low volume flow rate,the flow loss is generated mainly on the suction side near the trailing edge of the blade.The flow loss is related to the counterclockwise vortexes generated on the suction side of the main blade.The vortexes are caused by the flow separation in the downstream region of the impeller passage,which is different from air compressors operating at low flow rates.The reason for this flow separation is that the effect of Coriolis force is especially severe for the sCO_(2) fluid,compared to the viscous force and inertial force.At lower flow rates,with the stronger effect of Coriolis force,the direction of relative flow velocity deviates from the direction of radius,resulting in its lower radial component.The lower radial relative flow velocity leads to severe flow separation on the suction side near the trailing edge of the main blade. | YANG Zimu JIANG Hongsheng ZHUGE Weilin CAI Ruikai YANG Mingyang CHEN Haoxiang QIAN Yuping ZHANG Yangjun | 2024 | Journal of Thermal Science2024，33，1： | 0 |
| 14 | Cooperative Perception Optimization Based on Self-Checking Machine Learning显示文摘In the process of spectrum perception,in order to realize accurate perception of the channel state,the method of multi-node cooperative perception can usually be used.However,the first problem to be considered is how to complete information fusion and obtain more accurate and reliable judgment results based on multi-node perception results.The ideas put forward in this paper are as follows:firstly,the perceived results of each node are obtained on the premise of limiting detection probability and false alarm probability.Then,on the one hand,the weighted fusion criterion of decision-making weight optimization of each node is realized based on a genetic algorithm,and the useless nodes also can be screened out to reduce energy loss;on the other hand,through the linear fitting ability of RBF neural network,the self-inspection of the perceptive nodes can be realized to ensure the normal operation of the perceptive work of each node.What's more,the real-time training data can be obtained by spectral segmentation technology to ensure the real-time accuracy of the optimization results.Finally,the simulation results show that this method can effectively improve the accuracy and stability of channel perception results,optimize the structure of the cooperative network and reduce energy consumption. | Haoxiang Sun Changxing Chen Yunfei Ling Mu Yang | 2020 | Computers, Materials & Continua2020，，2： | 0 |
| 15 | Disturbance Observer-Based Safe Tracking Control for Unmanned Helicopters With Partial State Constraints and Disturbances显示文摘In this paper, a disturbance observer-based safe tracking control scheme is proposed for a medium-scale unmanned helicopter with rotor flapping dynamics in the presence of partial state constraints and unknown external disturbances. A safety protection algorithm is proposed to keep the constrained states within the given safe-set. A second-order disturbance observer technique is utilized to estimate the external disturbances. It is shown that the desired tracking performance of the controlled unmanned helicopter can be achieved with the application of the backstepping approach, dynamic surface control technique, and Lyapunov method. Finally, the availability of the proposed control scheme has been shown by simulation results. | Haoxiang Ma Mou Chen Qingxian Wu | 2023 | IEEE/CAA Journal of Automatica Sinica2023，10，11： | 0 |
| 16 | A Policy Integration Method Based on Multilevel Security for Data Integration显示文摘Integrating and sharing data from different data sources is one of the trends to make better use of data. However,data integration hampers data confidentiality where each data source has its own access control policy. This paper includes a discussion on the issue about access control across multiple data sources when they are combined together in the scenario of searching over these data. A method based on multilevel security for data integration is proposed. The proposed method allows the merging of policies and also tackles the issue of policy conflicts between different data sources. | WANG Xinming TAN Haoxiang CHEN Kaijun TANG Hua ZHAO Gansen TANG Yong NIE Ruihua | 2015 | Wuhan University Journal of Natural Sciences2015，20，6： | 0 |
| 17 | Synthesis of Clionastatins A and B through Enhancement of Chlorination and Oxidation Levels of Testosterone显示文摘A full account of semisyntheses of polychlorinated marine steroids clionastatins A and B is described.We have developed a unique two-stage chlorination-oxidation strategy that enabled concise and divergent semisyntheses of clionastatins A and B in 16 steps from inexpensive testosterone.Key transformations in chlorination stage include(a)conformationally controlled,stereospecific dichlorination through an unusualβ-chloronium intermediate to install the diequatorial C1,C2-dichloride;(b)C4-OH directed C19–H oxygenation followed by challenging neopentyl chlorination to install the C19–Cl.The high oxidation level was constructed through(a)the desaturation at C6–C7 through one-pot photochemical dibromination–reductive debromination;(b)regioselective anti-Markovnikov oxidation of the C6–C7 double bond by photoredox-metal dual catalysis to forge the B ring enone;(c)late-stage desaturation with SeO_(2)to introduce C8–C9 double bond.Wharton transposition was used to forge the D-ring enone,and thermodynamically driven epimerization secured the cis-fused C/D ring system.Furthermore,we also provided a 14-step approach to clionastatin A by optimizing the construction of the D-ring enone with a dehydration-oxidation sequence. | Hao Cui Yang Shen Ruifeng Wang Haoxiang Wei Xin Lei Yanyu Chen Pengfei Fu Haoxiang Wang Ruihao Bi Yandong Zhang | 2022 | Chinese Journal of Chemistry2022，40，23： | 0 |
| 18 | PNb_(9)O_(25) nanofiber as a high-voltage anode material for advanced lithium ions batteries显示文摘If the operating voltage of anode materials is below 1.0 V versus Lit/Li,the side reaction between electrolyte and anode materials will occur extensively.Thus,high-voltage anode materials have aroused interest recently.In this work,we report the preparation of PNb9O25 nanofiber via a facile electrospinning method.The PNb9O25 nanofiber shows the high rate performance and excellent cycling performance when it is used as anode in lithium ions batteries.For instance,the PNb9O25 nanofiber can deliver a capacity of 233,212.1,193.8,and 181.4 mA h g^(-1) at 0.2,1,3,and 6C,respectively.After 1000 cycles,it can reach at 134.3 mA h g^(-1) with capacity retention of 70.9%.Meanwhile,the ex situ X-ray photoelectron spectroscopy technique has been adopted to investigate the evolution in valence state of each element for PNb9O25 nanofiber.In addition,the PNb9O25 nanofiber is chosen as the anode material in lithium ion full cell in this work,demonstrating the potential for practical application. | Haoxiang Yu Jundong Zhang Maoting Xia Chenchen Deng Xikun Zhang Runtian Zheng Shi Chen Jie Shu Zhen-Bo Wang | 2020 | Journal of Materiomics2020，6，4： | 0 |
| 19 | Simulating the GRF of Humanoid Robot Vertical Jumping Using a Simplified Model with a Foot Structure for Foot Design显示文摘There are many theories and tools for human or robot motion simulation,but most of them require complex calculations.The LNZN model(a simplified model named by the proposers)simplifies the human model and facilitates simulation of the Ground Reaction Force(GRF)of body landing by spring damping model and ignoring joint rotation movements,which can reduce the amount of computation obviously.In this paper,the LNZN model of human running is selected as the basis and is modified to obtain the LNZN model of a robot,which expands the application of the LNZN model.According to the structure of the human foot,a foot structure is then added to the simplified model to reduce the GRF.We also applied driving forces to the new model to simulate the whole high jump motion of the robot to expand the functions of the LNZN model.The obtained GRF data were anastomotic to the actual experimental results.In addition,the effects of variables,such as the mass,hardness,and damping,of the foot on the GRF at the moment of landing were also explored.Finally,based on the guidelines obtained for the design of the robot’s foot structure,we fabricated new robot’s feet and installed them on the actual robot and achieved a better cushioning effect than the original foot in experiments. | Chuanku Yi Xuechao Chen Yu Zhang Zhangguo Yu Haoxiang Qi Yaliang Liu Qiang Huang | 2024 | Journal of Bionic Engineering2024，21，1： | 0 |
| 20 | Investigating the Impact of Capacity Utilization on Carbon Dioxide Emission: Evidence from China's Iron and Steel Industry显示文摘In recent years, China’s industrialization and urbanization have deepened, and the economy has grown considerably. But at the same time, they have also brought about many environmental problems. As a pillar of the national economy, the iron and steel(IS) industry is one of the most emitting and energy-consuming sub-sectors of the industrial sector. It is also one of the industries with the most severe overcapacity problem in China. In this paper, we explore the impact of capacity utilization on carbon dioxide emission based on panel data of China’s iron and steel industry from 2005 to 2014. We also tested the heterogeneity in different regions and different sub-samples. Results show that capacity utilization and carbon dioxide emission are positively correlated. However, the impact of capacity utilization on carbon dioxide emission differs when considering regional heterogeneity. Results in all three regions show a positive relationship between capacity utilization and carbon dioxide emission,but the impact intensity is strongest in the western region, followed by the eastern and central regions.Moreover, capacity utilization impacts carbon dioxide emission by influencing firm numbers in the iron and steel industry and energy consumption. Further analysis shows that there exists a threshold effect in different stages of energy consumption and energy structure. Finally, some findings and practical policy recommendations are provided. | Ya CHEN Xintian ZHANG Haoxiang LIU | 2021 | Journal of Systems Science and Information2021，9，6： | 0 |
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