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| 1 | Ecological optimization of an irreversible harmonic oscillators Carnot heat engine显示文摘A model of an irreversible quantum Carnot heat engine with heat resistance,internal irreversibility and heat leakage and many non-interacting harmonic oscillators is established in this paper. Based on the quantum master equation and semi-group approach,equations of some important performance parameters,such as power output,efficiency,exergy loss rate and ecological function for the irreversible quantum Carnot heat engine are derived. The optimal ecological performance of the heat engine in the classical limit is analyzed with numerical examples. Effects of internal irreversibility and heat leakage on the ecological performance are discussed. A performance comparison of the quantum heat engine under maximum ecological function and maximum power conditions is also performed. | LIU XiaoWei CHEN LinGen WU Feng SUN FengRui | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，12： | 16 |
| 2 | Prognostic factors of primary gastrointestinal stromal tumors: a cohort study based on high-volume centers显示文摘Objective: We aimed to evaluate the clinicopathologic characteristics, immunohistochemical expression and prognostic factors of patients with primary gastrointestinal stromal tumors(GISTs).Methods: Data from 2,570 consecutive GIST patients from four medical centers in China(January2001–December 2015) were reviewed. Survival curves were constructed by the Kaplan-Meier method, and Cox regression models were used to identify independent prognostic factors.Results: Of the included patients, 1,375(53.5%) were male, and the patient age range was 18 to 95(median, 58)years. The tumors were mostly found in the stomach(64.5%), small intestine(25.1%) and colorectal region(5.1%).At the time of diagnosis, the median tumor size was 4.0(range: 0.1–55.0) cm, and the median mitotic index per 50 high power fields(HPFs) was 3(range: 0–254). Of the 2,168 resected patients, 2,009(92.7%) received curative resection. According to the modified National Institutes of Health(NIH) classification, 21.9%, 28.9%, 14.1% and35.1% were very low-, low-, intermediate-and high-risk tumors, respectively. The rate of positivity was 96.4% for c-Kit, 87.1% for CD34, 96.9% for delay of germination 1(DOG-1), 8.0% for S-100, 31.0% for smooth muscle actin(SMA) and 5.1% for desmin. However, the prognostic value of each was limited. Multivariate analysis showed that age, tumor size, mitotic index, tumor site, occurrence of curative resection and postoperative imatinib were independent prognostic factors. Furthermore, we found that high-risk patients benefited significantly from postoperative imatinib(P<0.001), whereas intermediate-risk patients did not(P=0.954).Conclusions: Age, tumor size, mitotic index, tumor site, occurrence of curative resection and postoperative imatinib were independent prognostic factors in patients with GISTs. Moreover, determining whether intermediate-risk patients can benefit from adjuvant imatinib would be of considerable interest in future studies. | Xuechao Liu Haibo Qiu Peng Zhang Xingyu Feng Tao Chen Yong Li Kaixiong Tao Guoxin Li Xiaowei Sun Zhiwei Zhou | 2018 | Chinese Journal of Cancer Research2018，30，1： | 14 |
| 3 | Exploring coupling coordination between urbanization and ecosystem quality (1985-2010): a case study from Lianyungang City, China显示文摘都市化过程在生态的功能和风景模式通过改变影响生态系统。当前,全部的生态系统服务价值(ESV ) 的分析指向了人从地区性的生态系统获得,但是通常不关于生态的结构和模式包括信息的全面好处。因此,结果不能反映本地生态系统的全面状态。我们为评估地区性的生态系统的质量基于 ESVand 风景度量标准建议新、综合生态系统质量指示物。我们为从 1985 ~ 2010 在 Lianyungang 城市里评估在都市化和生态系统质量之间的相互关系采用了协作的 a coupled 度的方法。在都市化和生态系统质量之间的协作的联合的度显示出一条反的 U 字形的曲线。在都市化(19851995 ) 的主要阶段,都市化和生态系统联合的度恰好就被平衡。从 1995 直到 2000,联合系统到达了一个平衡条件,都市化水平在增加了。自从 2000,都市化过程加速了。在都市化和生态系统之间的协作在 2005 完成了最佳条件。一个转弯的点同时出现了,并且联合协作的度开始从最佳掉落。随后,联合系统再次进入了一个恰好平衡的州。总的来说,自从 1985,生态系统质量的全面水平减少了并且在 2005 以后严厉地降级了,建议本地生态系统质量的全面降级。 | Junyong AI Lan FENG Xiaowei DONG Xiaodong ZHU Yangfan LI | 2016 | Frontiers of Earth Science2016，10，3： | 13 |
| 4 | Process optimization of neodymium chloride solutions precipitated by magnesium bicarbonate显示文摘Rare earths(REs) are of vital importance for the development of new materials and green energy.Magnesium bicarbonate is one of the most recyclable and environmental-friendly precipitant for REs recovery from leaching solutions. Nd_2(CO_3)_3 has difficulties in industrial production. So in this study,the precipitation of neodymium from chloride solution by magnesium bicarbonate are investigated. The effects of feeding method, [HCO_3^-]/[Nd^(3+)] mole ratio, feeding speed and reaction temperature on yield and impurity(magnesia) content are systematically studied. Results show that the impurity(magnesia)content decreases to 0.010 wt% with a yield approaching to 100% obtained under the conditions of[HCO_3^-]/[Nd^(3+)] = 3.00 by parallel flow addition at 50 ℃. The major impurity(magnesia) in rare earth carbonates mainly presents in the form of physical absorption, which can be easily removed by scrubbing. Therefore, it offers a promising green process that uses magnesium bicarbonate to produce neodymium carbonate due to its cycling of carbon dioxide, magnesium salt and waste water. | Yannan Yan Yang Xu Xiaowei Huang Zongyu Feng Yongke Hou Kai Li Liangshi Wang Yihanna Hu | 2019 | Journal of Rare Earths2019，37，4： | 10 |
| 5 | Bioinspired Self-Healing Organic Materials: Chemical Mechanisms and Fabrications显示文摘 | Xiangyu Yin Zhilu Liu Daoai Wang Xiaowei Pei Bo Yu Feng Zhou | 2015 | Journal of Bionic Engineering2015，12，1： | 8 |
| 6 | Position-optimization on retained entry and backfilling wall in gob-side entry retaining techniques显示文摘 | Xiaowei Feng Nong Zhang | 2015 | International Journal of Coal Science & Technology2015，2，3： | 6 |
| 7 | Low-complexity method for DOA estimation based on ESPRIT显示文摘A low-complexity method for direction of arrival(DOA) estimation based on estimation signal parameters via rotational invariance technique(ESPRIT) is proposed.Instead of using the cross-correlation vectors in multistage Wiener filter(MSWF),the orthogonal residual vectors obtained in conjugate gradient(CG) method span the signal subspace used by ESPRIT.The computational complexity of the proposed method is significantly reduced,since the signal subspace estimation mainly needs two matrixvector complex multiplications at the iteration of data level.Furthermore,the prior training data are not needed in the proposed method.To overcome performance degradation at low signal to noise ratio(SNR),the expanded signal subspace spanned by more basis vectors is used and simultaneously renders ESPRIT yield redundant DOAs,which can be excluded by performing ESPRIT once more using the unexpanded signal subspace.Compared with the traditional ESPRIT methods by MSWF and eigenvalue decomposition(EVD),numerical results demonstrate the satisfactory performance of the proposed method. | Xuebin Zhuang Xiaowei Cui Mingquan Lu Zhenming Feng | 2010 | Journal of Systems Engineering and Electronics2010，21，5： | 6 |
| 8 | A flexible carbon nanotube@V_(2)O_(5) film as a high-capacity and durable cathode for zinc ion batteries显示文摘Aqueous zinc-ion batteries(ZIBs)are receiving a continuously increasing attention for mobile devices,especially for the flexible and wearable electronics,due to their non-toxicity,non-flammability,and low-cost features.Despite the significant progress in achieving higher capacities for electrode materials of ZIBs,to endow them with high flexibility and economic feasibility is,however,still a significant challenge remaining unsolved.Herein,we present a highly flexible composite film composed of carbon nanotube film and V_(2)O_(5)(CNTF@V_(2)O_(5))with high strength and high conductivity,which is prepared by simply impregnating a porous CNT film with an aqueous V_(2)O_(5)sol under vacuum.For this material,intimate incorporation between V_(2)O_(5)and CNTs has been achieved,successfully integrating the high zinc ion storage capability with high mechanical flexibility.As a result,this CNTF@V_(2)O_(5)film delivers a high capacity of 356.6 m Ah g^(-1)at 0.4 A g^(-1)and excellent cycling stability with 80.1%capacity retention after 500 cycles at 2.0 A g^(-1).The novel strategy and the outstanding battery performance presented in this work should shed light on the development of high-performance and flexible ZIBs. | Xiaowei Wang Liqun Wang Bao Zhang Jianmin Feng Jiafeng Zhang Xing Ou Feng Hou Ji Liang | 2021 | Journal of Energy Chemistry2021，30，8： | 5 |
| 9 | Networking retinomorphic sensor with memristive crossbar for brain-inspired visual perception显示文摘Compared to human vision,conventional machine vision composed of an image sensor and processor suffers from high latency and large power consumption due to physically separated image sensing and processing.A neuromorphic vision system with brain-inspired visual perception provides a promising solution to the problem.Here we propose and demonstrate a prototype neuromorphic vision system by networking a retinomorphic sensor with a memristive crossbar.We fabricate the retinomorphic sensor by using WSe_(2)/h-BN/Al_(2)O_(3)van der Waals heterostructures with gate-tunable photoresponses,to closely mimic the human retinal capabilities in simultaneously sensing and processing images.We then network the sensor with a large-scale Pt/Ta/Hf O_(2)/Ta one-transistor-one-resistor(1 T1 R)memristive crossbar,which plays a similar role to the visual cortex in the human brain.The realized neuromorphic vision system allows for fast letter recognition and object tracking,indicating the capabilities of image sensing,processing and recognition in the full analog regime.Our work suggests that such a neuromorphic vision system may open up unprecedented opportunities in future visual perception applications. | Shuang Wang Chen-Yu Wang Pengfei Wang Cong Wang Zhu-An Li Chen Pan Yitong Dai Anyuan Gao Chuan Liu Jian Liu Huafeng Yang Xiaowei Liu Bin Cheng Kunji Chen Zhenlin Wang Kenji Watanabe Takashi Taniguchi Shi-Jun Liang Feng Miao | 2021 | National Science Review2021，8，2： | 5 |
| 10 | Discussions on rockburst and dynamic ground support in deep mines显示文摘The paper is a summary of discussions on four topics in rockburst and dynamic ground support.Topic 1 is the mechanisms of rockburst.Rockburst events are classified into two categories in accordance with the triggering mechanisms,i.e.strain burst and fault-slip burst.Strain burst occurs on rock surfaces when the tangential stress exceeds the rock strength in hard and brittle rocks.Fault-slip burst is triggered by fault-slip induced seismicity.Topic 2 is prediction and forecasting of rockburst events.Prediction for a rockburst event must tell the location,timing and magnitude of the event.Forecasting could simply foresee the probability of some of the three parameters.It is extremely challenging to predict rockbursts and large seismic events with current knowledge and technologies,but forecasting is possible,for example the possible locations of strain burst in an underground opening.At present,the approach using seismic monitoring and numerical modelling is a promising forecasting method.Topic 3 is preconditioning methods.The current preconditioning methods are blasting,relief-hole drilling and hydrofracturing.Defusing fault-slip seismicity is difficult and challenging but has been achieved.In very deep locations(>3000 m),the fracturing could extend from the excavation face to a deep location ahead of the face and therefore preconditioning is usually not required.Topic 4 is dynamic ground support against rockburst.Dynamic ground support requires that the support system be strong enough to sustain the momentum of the ejecting rock on one hand and tough enough on the other hand to absorb the strain and seismic energies released from the rock mass.The current dynamic support systems in underground mining are composed of yielding tendons and flexible surface retaining elements like mesh/screen and straps.Yielding props and engineered timber props are also used for dynamic support. | Charlie C.Li Peter Mikula Brad Simser Bruce Hebblewhite William Joughin Xiaowei Feng Nuwen Xu | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，5： | 5 |
| 11 | Patterns and security technologies for co-extraction of coal and gas in deep mines without entry pillars显示文摘 | Nong Zhang Fei Xue Nianchao Zhang Xiaowei Feng | 2015 | International Journal of Coal Science & Technology2015，2，1： | 5 |
| 12 | Extraction kinetics of neodymium from chloride medium using HEH/EHP saponified with magnesium bicarbonate solution显示文摘Magnesium bicarbonate solution is considered as an environmentally friendly extractant saponification agent for the solvent extraction of rare earth elements due to its advantage of minimum water pollution.In order to reveal the extraction regularity, optimize production-process and guide the use of this new extraction system, the extraction of Nd(Ⅲ) in chloride medium with HEH/EHP saponified by magnesium bicarbonate solution was investigated with the self-designed constant interfacial area cell. Besides, the effects of stirring rate, temperature, specific interfacial area and concentration of Mg-HEH/EHP on the extraction rate of Nd(Ⅲ) were systematically investigated. Results show that, the rate of extraction is governed by both diffusion and chemical reaction, and the extraction reaction takes place at the interface. The apparent activation energy of the extraction reaction is 16.88 kJ/mol. The corresponding rate equation is deduced. The mechanisms and rate-determining step are speculated based on interfacial reaction models, which is consistent with the experimental results. | Hao Lv Xiaowei Huang Zongyu Feng Meng Wang Xu Sun Xinlin Peng Dali Cui Yihanna Hu | 2019 | Journal of Rare Earths2019，37，3： | 4 |
| 13 | Grain boundary segregation and its influences on ionic conduction properties of scandia doped zirconia electrolytes显示文摘Solid oxide fuel cell is a promising energy conversion system which converts chemical energy into electrical energy directly. Electrolyte is the key component and determines the working temperature. In this paper,ceria and scandia co-doped zirconia electrolytes sintered from 1300 to 1550 ℃ were chosen as research objects. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy were performed to characterize the ceramic samples. The effects of grain size and grain boundary element segregation on the electrical conductivity were focused. Electrochemical impedance spectroscopy was used to calculate the bulk, grain boundary and specific grain boundary conductivity. Results show that the bulk and grain boundary ionic conductivity increases with the increasing grain size.However, the specific grain boundary conductivity decreases with the increasing grain size. This is explained by the fact that Sc^(3+) is segregated at the grain boundary, which leads to higher oxygen vacancy concentration when sintered at lower temperature. | Qiannan Xue Xiaowei Huang Jianxing Zhang He Zhang Zongyu Feng | 2019 | Journal of Rare Earths2019，37，6： | 4 |
| 14 | Recovery of rare earths and aluminum from FCC waste slag by acid leaching and selective precipitation显示文摘This paper investigated the recovery of rare earth elements(REEs) and aluminum(AI) from the waste slag discharged by FCC catalyst factory(FCC waste slag) via acid leaching and selective precipitation.Analysis methods such as ICP-AES, XRF and XRD were applied to obtain experiment data. The maximum leaching efficiency of REEs and Al was achieved at pH value of 1 and with liquid to solid ratio of 4:1,Under such conditions, 91.01%, 92.24% and 94.77% of La, Ce and Al were extracted at 20 ℃ for 2 h from the FCC waste slag, respectively. The SiO_2 content in the leaching residue was 88.3%, which can be used as an available silicon resource. The REEs can be precipitated in the form of REEs and sodium double sulfate(NaRE(SO_4)_2·xH_2 O) by adding Na_2 SO_4 to the leaching solution, while Al remained in the solution. Afterwards, the pH value of the filtrate was adjusted to 4.5, and Al was precipitated as AI(OH)_3. Finally,NaRE(SO_4)_2·xH_2 O and Al(OH)_3 were converted into RECl_3 and Al_2(SO4)_3 solution,respectively, which were recycled to manufacture zeolite. This process recovered REEs and Al from the FCC waste slag and reduced the emissions of waste slag simultaneously, which has an important economic and environment significance. | Jinyu wang Xiaowei Huang Dali Cui Liangshi Wang Zongyu Feng Bin Hu Zhiqi Long Na Zhao | 2017 | Journal of Rare Earths2017，35，11： | 4 |
| 15 | Synthesis of lanthanum oxide nanosheets by a green carbonation process显示文摘Two-dimensional metal oxide nanostructures,such as nanoplates,nanowalls,and nanosheets,have received further attentions in recent years,due to their outstanding properties resulted from the small thickness and quantum size effects.In this work,lanthanum oxide nanosheets with the thickness of 56 nm had been successfully prepared by an originally simple method of carbon dioxide carbonation;the preparation process was green without using surfactants and detergent.The X-ray diffraction,transmission electron microscopy,and scanning electron microscopy were used to characterize the products.Thermogravimetric-differential thermal analysis and FT-IR were introduced to prove that the lanthanum oxide precursor with lamellar morphology was La2(CO3)3 3H2O.The carbon dioxide carbonation method would provide significant benefits containing mild reaction conditions,high efficiency,low cost,and easy to realize large-scale production. | Yanfei Xiao Zongyu Feng Xiaowei Huang Li Huang Zhiqi Long Qiang Wang Yongke Hou | 2014 | Chinese Science Bulletin2014，59，16： | 4 |
| 16 | Numerically stable method of signal subspace estimation based on multistage Wiener filter显示文摘In this paper,a numerically stable method of signal subspace estimation based on Householder multistage Wiener filter(HMSWF) is proposed.Numerical stability of the method lies on the fact that the Householder matrix in HMSWF ensures the unitary blocking operation and significantly strengthens the orthogonality of basis vectors,especially in the finite-precision implementation.In the following,we analyze the numerical stability of HMSWF and MSWF based on the correlation subtractive structure(CSS-MSWF) by establishing the equivalence between the forward recursion of MSWF and the Arnoldi algorithm in numerical linear algebra.Besides,the equivalence between HMSWF and the Householder QR decomposition(QRD) on the Krylov matrix underlying in MSWF is directly established.Based on the relationship,two theoretical upper bounds of the orthogonality error of basis vectors in signal subspace are obtained and it is demonstrated that the orthogonality of basis vectors based on HMSWF is perfectly preserved by the numerically well-behaved Householder matrix,and the corresponding signal subspace estimation is much more numerically stable than that based on CSS-MSWF.Simulations show the numerical stability of the proposed method of signal subspace estimation by HMSWF. | ZHUANG XueBin CUI XiaoWei LU MingQuan FENG ZhenMing | 2010 | Science China(Information Sciences)2010，53，12： | 4 |
| 17 | HTDet:A Clustering Method Using Information Entropy for Hardware Trojan Detection显示文摘Hardware Trojans(HTs)have drawn increasing attention in both academia and industry because of their significant potential threat.In this paper,we propose HTDet,a novel HT detection method using information entropybased clustering.To maintain high concealment,HTs are usually inserted in the regions with low controllability and low observability,which will result in that Trojan logics have extremely low transitions during the simulation.This implies that the regions with the low transitions will provide much more abundant and more important information for HT detection.The HTDet applies information theory technology and a density-based clustering algorithm called Density-Based Spatial Clustering of Applications with Noise(DBSCAN)to detect all suspicious Trojan logics in the circuit under detection.The DBSCAN is an unsupervised learning algorithm,that can improve the applicability of HTDet.In addition,we develop a heuristic test pattern generation method using mutual information to increase the transitions of suspicious Trojan logics.Experiments on circuit benchmarks demonstrate the effectiveness of HTDet. | Renjie Lu Haihua Shen Zhihua Feng Huawei Li Wei Zhao Xiaowei Li | 2021 | Tsinghua Science and Technology2021，26，1： | 4 |
| 18 | Chlorination strategy on polymer donors toward efficient solar conversions显示文摘Bulk heterojunction(BHJ)polymer solar cells(PSCs)are promising candidates for next-generation solar cells.Benefitting from the persistent efforts in material design and synthesis,systematic device engineering and fundamental understanding of the device physics,the power conversion efficiency(PCE)of single PSC has been pushed to surpass 15%,and that of the tandem PSCs is over 17%.Recently,chlorination has drawn much interest and the chlorinated PSCs have been frequently reported in donor-acceptor(D-A)type conjugated polymers.This review summarizes the recent progress of the chlorinated strategy for highly efficient photovoltaic applications.We firstly discuss the chlorination on the acceptor units in D-A type donor polymers,emphasizing the 4 widely used acceptor units with their improved PCE.secondly,the chlorination on the donor units will be discussed,mainly focusing on the chlorination of benzo[1,2-b:4,b]dithiophene(BDT)unit and 2,2-bithiophene unit.Remarkably,the PCE of the chlorinated BDT-based device has been improved to over 14%.Overall,this review discusses the structure-property correlations of these chlorinated polymers in photovoltaic study,which could further provide guidance on the chlorinated strategy and the molecular design for high-performance photovoltaic devices. | Pengjie Chao Nicolas Johner Xiaowei Zhong Hong Meng Feng He | 2019 | Journal of Energy Chemistry2019，28，12： | 4 |
| 19 | Development of Dense Corundum-mullite Bricks for Blast Furnace Ceramic Pad显示文摘Dense corundum-mullite brick for blast furnace ceramic pad was prepared using white fused corundum and tabular corundum as aggregates,andalusite fine powder,sillimanite fine powder,zircon sand powder and Guangxi soil as the matrix,and phosphate as the binder,introducing different amounts ofα-alumina micropowder,tabular corundum fine powder and fused corundum powder.The properties of the prepared brick were studied.The results show that,the brick with 10 mass%of tabular corundum fine powder fired at 1560℃for 3 h in a tunnel kiln has the bulk density of 3.08 g·cm^(-3),the apparent porosity of 13.2%,the cold compressive strength of 178 MPa,the molten iron corrosion rate of 0.6%,the slag corrosion rate of 6.4%,the alkali resistance strength decreasing rate of 7.5%,and the thermal shock resistance of 32 cycles,which is both dense and of good thermal shock resistance.The slag resistance simulation test was performed,which proved that the prepared corundum-mullite brick is better than those currently supplied in the market. | GUO Xiaowei XIN Guiyan LEI Qizhen XIONG Naling SUN Feng LI Shaoguang SUN Gaoyang LI Bing | 2021 | China's Refractories2021，30，4： | 3 |
| 20 | Extraction mechanism and separation behaviors of low-concentration Nd^(3+) and Al^(3+) in P507-H_(2)SO_(4) system显示文摘In order to clarify the solvent extraction and separation behaviors of rare earths and impurity of Al during the extraction and enrichment of low-concentration leach solution of ion-adsorption rare earth ore,the extraction mechanism and separation behaviors of Nd^(3+)and Al^(3+)in the Nd_(2)(SO_(4))_(3)-AI_(2)(SO_(4))_(3) mixed solution using P507 were studied in this work.The extraction of Nd^(3+)and Al^(3+)follows the cation exchange mechanism.With the increase of the equilibrium pH,β_(Nd/Al) in the extraction of the Nd_(2)(SO_(4))_(3)-Al_(2)(SO_(4))_(3) mixed solution using P507 is always higher than that in the extraction of single Nd_(2)(SO_(4))_(3) and Al_(2)(SO_(4))_(3) solutions.It can be attributed to the fact that the extraction of Nd^(3+)using P507 is much faster than that of Al^(3+),and Al^(3+)is more prone to be hydrolyzed at lower pH.β_(Nd/Al) in the extraction of the Nd_(2)(SO_(4))_(3)-Al_(2)(SO_(4))_(3) mixed solution decreases gradually with the increase of mixing time within the equilibrium pH range of 1.5-1.9.The extraction of Nd^(3+)using P507 is much faster than that of Al^(3+),but the stability of Al^(3+)-Ioaded organic phase is better than that of Nd^(3+)-loaded organic phase,thus Nd^(3+)in the Nd^(3+)-loaded organic phase is gradually replaced by Al^(3+)in the aqueous phase with the increase of mixing time. | Hongyuan Zhang Longsheng Zhao Xudong Zheng Depeng Liu Zongyu Feng Yongqi Zhang Xiaowei Huang | 2022 | Journal of Rare Earths2022，40，6： | 3 |
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