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Geometric Structures and Field Equations of Dirac-Lu Space

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Communications in Theoretical Physics 2008年第11期50卷 1151-1154页

作者： ren xin-An ZHANG Li-You Department of Mathematics China University of Mining and Technology Xuzhou 221116 China Institute of Applied Mathematics Academy of Mathematics and Systems Sciences Chinese Academy of Sciences Beijing 100080 China Institute of Mathematics Academy of Mathematics and Systems Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper,a■-invariant Lorentz metric on the Dirac-Lu space is given,and then the geodesic equationis ***,we discuss the field equations and find their solutions by the method of separating variables.

关键词： Dirac-Lu space Lorentz metric Yang-Mills equation Dirac equation

Degradation of CTLA-4 balances toxicity and efficacy

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Science Bulletin 2019年第19期64卷 1388-1389页

作者： Zhenhua ren Yang-xin Fu The Department of Pathology UT Southwestern Medical CenterDallasTX75235-9072USA The Department of Immunology UT Southwestern Medical CenterDallasTX75235-9072USA

The notorious side effects of anti-CTLA-4 limit its use in the clinic,but what causes the severe side effects remains largely *** et al.[1]elucidated antibody-induced CTLA-4lysosomal degradation as a new mechanism accounting for the severe immunotherapy-related adverse effects and limited efficacy of anti-CTLA-4 ***-4 expresses on regulatory T cells(Tregs)and activated CD8 and CD4 effector cells.

关键词： Degradation CTLA-4 toxicity

AIGC Scenario Analysis and Research on Technology Roadmap of Internet Industry Application

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China Communications 2023年第10期20卷 292-304页

作者： Xiongfei ren Lili Tong Jia zeng Chen Zhang Beijing University of Posts and Telecommunications Beijing 100876China Faculty of Education Beijing Normal University Beijing 100875China

The explosion of ChatGPT is considered to be a milestone in the normalization of artificial intelligence education *** the technical line,the cross-modal AI generation application based on human feedback system is *** the business model,the scenes to realize interactive functions are constantly *** paper reviews the evolution process of AIGC,closely follows the current situation of the coexistence of business acceleration and technical worries in the application of artificial intelligence education,analyzes the application of AIGC education in 7 subdivided fields,and analyzes the optimization direction of application cases from the perspective of perception-cognition-creation technology maturity *** 3 recommendations and 2 follow-up research directions will promote the scientific application of artificial intelligence education in the AIGC period.

关键词： AIGC artificial intelligence education application large model

Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第01期 317-328页

作者： Qingmin Yang Jian Zhao Yujia Zhang xingyu Zhou Hao ren Bowen Hu Zhongli Lei Lixin Chen Peng Yang School of Material and Chemical Engineering Bengbu University Anhui Provincial Engineering Laboratory of Silicon-Based Materials School of Chemistry and Chemical Engineering Northwestern Polytechnical University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical Engineering Shaanxi Normal University International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal University

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular economy. Herein, we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal ions. Our method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical reagents. Amyloid-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces, resulting in a remarkable ～3.1 times improvement in the adsorption capacity of fly ash, a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB). The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins, activated carbon(AC), covalent organic frameworks(COFs), and metal-organic frameworks(MOFs). We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste leachates. Consequently, this strategy could increase the value of waste materials nearly 27 times. In addition, this method is generally extendable to other conventional industrial adsorbents such as resin, clay, and Al2O3, and enhances their adsorption capabilities at least twofold. Overall, this work provides a simple and green approach for improving the adsorption performance of solid particles, and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

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SWIFT J1749.4-2807: A neutron or quark star?

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Research in Astronomy and Astrophysics 2010年第9期10卷 815-820页

作者： Jun-Wei Yu ren-xin Xu School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

We investigate a unique accreting millisecond pulsar with X-ray eclipses, SWIFT J1749.4-2807 （hereafter J1749）, and try to set limits on the binary system by various methods including use of the Roche lobe, the mass-radius relations of both main sequence （MS） and white dwarf （WD） companion stars, as well as the measured mass function of the pulsar. The calculations are based on the assumption that the radius of the companion star has reached its Roche radius （or is at 90%）, but the pulsar＇s mass has not been assumed to be a certain value. Our results are as follows. The companion star should be an MS one. For the case that the radius equals its Roche one, we have a companion star with mass M ≈ 0.51 Me and radius Rc ≈ 0.52 R⊙, and the inclination angle is i ≈ 76.5°; for the case that the radius reaches 90% of its Roche one, we have M ≈ 0.43M⊙, Rc ≈ 0.44R⊙ and i ≈ 75.7°. We also obtain the mass of J1749, Mp ≈ 1 M⊙, and conclude that the pulsar could be a quark star if the ratio of the critical frequency of rotation-mode instability to the Keplerian one is higher than - 0.3. The relatively low pulsar mass （about - M⊙） may also challenge the conventional recycling scenario for the origin and evolution of millisecond pulsars. The results presented in this paper are expected to be tested by future observations.

关键词： X-rays binaries i binaries eclipsing -- pulsars general -- pulsars individual SWIFT J1749.4-2807

Real Interpolation between Martingale Hardy and BMO Spaces

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Acta Mathematica Sinica,English Series 2013年第1期29卷 65-74页

作者： Yan Bo ren Tie xin GUO School of Mathematics and Statistics He'nan University of Science and Technology School of Mathematics and Systems Science Beihang University

In this paper, we consider the real interpolation with a function parameter between martingale Hardy and BMO spaces. An interpolation theorem for martingale Hardy and BMO spaces is formulated. As an application, real interpolation between martingale Lorentz and BMO spaces is given. Keywords Martingale space, BMO space, Lorentz space, real interpolation, function parameter

关键词： Martingale space BMO space Lorentz space real interpolation function parameter

Low-Complexity Channel Reconstruction Methods Based on SVD-ZF Precoding in Massive 3D-MIMO Systems

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China Communications 2015年第S1期12卷 49-57页

作者： ren Yuwei SONG Yang SU xin Beijing University of Posts and Telecommunications State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunications Technology

In this paper, we study the low-complexity channel reconstruction methods for downlink precoding in massive multiple-Input multiple-Output(MIMO) systems. When the user is allocated less streams than the number of its antennas, the base station(BS) or user usually utilizes the singular value decomposition(SVD) to get the effective channels, whose dimension is equal to the number of streams. This process is called channel reconstruction and done in BS for time division duplex(TDD) mode. However, with the increasing of antennas in BS, the computation burden of SVD is getting incredible. Here, we propose a series of novel low-complexity channel reconstruction methods for downlink precoding in 3D spatial channel model. We consider different correlations between elevation and azimuth antennas, and divide the large dimensional matrix SVD into two kinds of small-size matrix SVD. The simulation results show that the proposed methods only produce less than 10% float computation than the traditional SVD zero-forcing(SVD-ZF) precoding method, while keeping nearly the same performance of 1Gbps.

关键词： channel reconstruction SVD 3D-MIMO massive MIMO

Sedimentary Changes of a Sand Layer in Liquefied Silts

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Journal of Ocean University of China 2021年第5期20卷 1046-1054页

作者： ren Yupeng zeng Yu XU xingbei XU Guohui Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Qingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Zhejiang Huadong Construction Engineering Co. Ltd.Hangzhou 310000China

A flume experiment was conducted to investigate the restratification of liquefied sediment strata under a wave load with the focus on the interbedded strata of coarse and fine sediments formed in estuarine and coastal *** aim of this research was to study the characteristics and processes of liquefied sediment strata in terms of wave-induced *** the experiment,the bottom bed liquefied under the wave action and the liquefied soil moved in the same period with the overlying waves,and the track of the soil particles in the liquefied soil was an *** sand layer consisting of coarse particles in the upper part,settled into the lower silt *** sinking of coarse particles and upward migration of the fine particles of the lower layer induced by liquefied sediment fluctuations are the likely reasons for sedimentation of the sand layer in liquefied silt.

关键词： storm-liquefied sediment strata liquefaction sand layer settlement silt interlayer particle sorting

Removal of Methyl Violet from aqueous solutions using poly (acrylic acid-co-acrylamide)/attapulgite composite

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Journal of Environmental Sciences 2010年第1期22卷 7-14页

作者： YongshengWang Li zeng Xuefeng ren Hai Song Aiqin Wang Key Laboratory of Resources and Environment Chemistry of West China Hexi University Zhangye 734000 China Center of Eco-Material and Green Chemistry Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences Lanzhou 730000 China

The adsorption of Methyl Violet （MV） cationic dye from aqueous solution was carried out by using crosslinked poly （acrylic acid-coacrylamide）/attapulgite （Poly（AA-co-AM）/ATP） composite as adsorbent. The factors influencing adsorption capacity of the composite such as pH, concentration of the dye, temperature, contact time, adsorbent dosage, ionic strength and surfactant were systematically investigated. The equilibrium data fitted very well to the Langmuir isotherm and the maximum adsorption capacity reached 1194 mg/g at 30℃. The thermodynamic parameters including △G0, △H0 and △S0 for the adsorption processes of MV on the composite were also calculated, and the negative △H0 and △G0 confirmed that the adsorption process was exothermicand spontaneous. The kinetic studies showed that the adsorption process was consistent with the pseudo second-order kinetic model and the desorption studies revealed that the regeneration of the composite adsorbent can be easily achieved.

关键词： composite Methyl Violet adsorption kinetics isotherm