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Determinant representation of Darboux transformation for the AKNS system

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Science China Mathematics 2006年第12期49卷 1867-1878页

作者： HE Jingsong zhang ling CHENG Yi LI Yishen Department of Mathematics University of Science and Technology of ChinaHefei 230026China Department of MathematicsUniversity of Science and Technology of ChinaHefei 230026China Department of MathematicsUniversity of Science and Technology of ChinaHefei 230026China Department of MathematicsUniversity of Science and Technology of ChinaHefei 230026China

The n-fold Darboux transform (DT) is a 2×2 matrix for the Ablowitz-Kaup-Newell-Segur (AKNS) *** this paper,each element of this matrix is expressed by 2n + 1 ranks'*** these formulae,the determinant expressions of eigenfunctions generated by the n-fold DT are ***,we give out the explicit forms of the n-soliton surface of the Nonlinear Schrodinger Equation (NLS) by the determinant of eigenfunctions.

关键词： darboux transformation,AKNS system (Ablowitz-Kaup-Newell-Segur System),determinant,soliton surface.

Tel1 and Rif2 oppositely regulate telomere protection at uncapped telomeres in Saccharomyces cerevisiae

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Journal of Genetics and Genomics 2018年第9期45卷 467-476页

作者： ling-Li zhang Zhenfang Wu Jin-Qiu Zhou CAS Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences University of Chinese Academy of Sdences Shanghai 200031 China School of Life Science and Technology Shanghai Tech University Shanghai 201210 China

It has been well documented that Tel1 positively regulates telomere-end resection by promoting Mre11-Rad50-Xrs2（MRX） activity, while Rif2 negatively regulates telomere-end resection by inhibiting MRX activity. At uncapped telomeres, whether Tel1 or Rif2 plays any role remains largely unknown. In this work, we examined the roles of Tel1 and Rif2 at uncapped telomeres in yku70△ and/or cdc13-1 mutant cells cultured at non-permissive temperature. We found that deletion of TEL1 exacerbates the temperature sensitivity of both yku70△ and cdc13-1 cells. Further epistasis analysis indicated that MRX and Tel1 function in the same pathway in telomere protection. Consistently, TEL1 deletion increases accumulation of Exo1-dependent telomeric single-stranded DNA（ssDNA） at uncapped telomeres, which stimulates checkpoint-dependent cell cycle arrest. Moreover, TEL1 deletion in yku70△ cells facilitates Rad51-dependent Y0 recombination. In contrast, RIF2 deletion in yku70△ cells decreases the accumulation of telomeric ssDNA after 8 h of incubation at the non-permissive temperature of 37℃ and suppresses the temperature sensitivity of yku70△ cells, likely due to the increase of Mre11 association at ***, our findings indicate that Tel1 and Rif2 regulate telomere protection at uncapped telomeres via their roles in balancing MRX activity in telomere resection.

关键词： Tel1 RiF2 MRX Uncapped telomeres Telomere protection

Maps Preserving Numerical Radius or Cross Norms of Products of Self-adjoint Operators

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Acta Mathematica Sinica,English Series 2010年第6期26卷 1071-1086页

作者： Kan HE Jin Chuan HOU Xiu ling zhang Department of Mathematics Shanxi University Taiyuan 030006 P. R. China Department of Applied Mathematics Taiyuan University of Technology Taiyuan 030024 P. R. China Department of Mathematics Shanxi Normal University Linfen 041004 P. R. China

Let H be a complex Hilbert space with dimH ≥3, Bs（H） the （real） Jordan algebra of all self-adjoint operators on H. Every surjective map Ф ： Bs（H）→13s（H） preserving numerical radius of operator products （respectively, Jordan triple products） is characterized. A characterization of surjective maps on Bs （H） preserving a cross operator norm of operator products （resp. Jordan triple products of operators） is also given.

关键词： space of self-adjoint operators numerical radius product of operators

Rainfall Microphysical Properties of Landfalling Typhoon Yagi(201814)Based on the Observations of Micro Rain Radar and Cloud Radar in Shandong,China

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Advances in Atmospheric Sciences 2021年第6期38卷 994-1011页

作者： Hong WANG Wenqing WANG Jun WANG Dianli GONG Dianguo zhang ling zhang Qiuchen zhang Shandong Institute of Meteorological Sciences Jinan 250031China Weather Modification Office of Shandong Province People's Government Jinan 250031China Key Laboratory for Cloud Physics of China Meteorological Administration Beijing 100081China zhangqiu Meteorological Bureau Jinan 250031China

The development and evolution of precipitation microphysical parameters and the vertical structure characteristics associated with Typhoon Yagi(201814)are analyzed in the city of Jinan,Shandong Province based primarily on the observations of a micro rain radar(MRR),a cloud radar,and a *** precipitation process is further subdivided into four types:convective,stratiform,mixed,and light precipitation according to the ground disdrometer data,which is in agreement with the vertical profile of the radar reflectivity detected by the *** winds may be the main source of MRR retrieval error during convective *** precipitation has the shortest duration but makes the largest contribution to the cumulative ***-coalescence is the main microphysical process of stratiform precipitation and light precipitation below the bright band observed by the *** is worth noting that as Typhoon Yagi(201814)transformed into an extratropical cyclone,its raindrop size distributions no longer had the characteristics of maritime precipitation,but become more typical of the characteristic of continental precipitation,which represents a very different raindrop size distribution from that which is normally observed in a landfalling typhoon.

关键词： typhoon rain drop size distribution micro rain radar cloud radar

Pilot plant study on ozonation and biological activated carbon process for drinking water treatment

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Journal of Environmental Sciences 2006年第2期18卷 232-235页

作者： KONG ling-yu zhang Xiao-jian WANG Zhan-sheng Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

A study on advanced drinking water treatment was conducted in a pilot scale plant taking water from conventional treatment process. Ozonation-biological activated carbon process （O3-BAC） and granular activated carbon process （GAC） were evaluated based on the following parameters： CODMn, UV254, total organic carbon （TOC）, assimilable organic carbon （AOC） and biodegradable dissolved organic carbon （BDOC）. In this test, the average removal rates of CODMn, UV254 and TOC in O3-BAC were 18.2%, 9.0% and 10.2% higher on （AOC） than in GAC, respectively. Ozonation increased 19.3-57.6 μg Acetate-C/L in AOC-P17, 45.6-130.6 μg Acetate-C/L in AOC-NOX and 0.1-0.5 mg/L in BDOC with ozone doses of 2 8 mg/L. The optimum ozone dose for maximum AOC formation was 3 mgO3/L. BAC filtration was effective process to improve biostability.

关键词： ozonation biological activated carbon CODMn UV254 TOC AOC BDOC biostability

Effect of Al2O3/TiO2/Na2O on enrichment of phosphorus in P-bearing steelmaking slag

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Journal of Iron and Steel Research International 2019年第8期26卷 796-805页

作者： Kan Yu Yan-ling zhang Feng-shan Li Ming Gao State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

To explore the influence of Al2O3/TiO2/Na2O on the mineralogical structure and phosphorus enrichment of converter slag, phosphorus enrichment and distribution in the CaO-SiO2-Fe2O3-MgO-Al2O3/TiO2/Na2O slag system were experimen-tally examined. The results show that phosphorus mainly exists in an n2CaO·SiO2-3CaO·P2O5 (nC2S-C3P) solid solution. Al2O3/TiO2/Na2O is beneficial for phosphorus enrichment in the CaO-SiO2-Fe2O3-MgO slag system to various degrees. This allows screening and separation of the enriched phase in the slag. When Al2O3 content was increased from 0 to 15%, the P2O5 content in the P-rich phase increased from 13.88 to 21.32%, and the area of the P-rich phase decreased from 57.50 to 37.87%. When the TiO2 content was increased from 0 to 10%, the content of P2O5 in the P-rich phase increased from 13.88 to 22.90%, and the area of the P-rich phase decreased from 57.50 to 39.20%. When the contents of Al2O3 and TiO2 were increased, the previously formed nC2S-C3P solid solution transformed into n′C2S-C3P (n < n′) with higher phos-phorus content. Na2O had no significant effect on phosphorus enrichment, but exerted significant influence on the area of the P-rich phase. When the Na2O content was increased from 0 to 8%, the previously formed nC2S-C3P solid solution gradually became Na2Ca4(PO4)2SiO4, and the area of the P-rich phase increased from 57.50 to 68.50%. With increasing the content of ATN (a mixture with a mass ratio of Al2O3/TiO2/Na2O = 15:4:3) from 0 to 30%, the content of P2O5 increased from 13.88 to 42.10% and the area of the P-rich phase decreased from 54.92 to 18.40%.

关键词： Phosphorus enrichment nC2S-C3P solid solution Modification P-bearing steelmaking slag

A novel bioinspired mechanism to elucidate the movement flexibility of the honeybee abdomen driven by muscles

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Insect Science 2022年第4期29卷 1181-1194页

作者： Yu-ling zhang Shao-Ze Yan You-Jian Liang Division of Intelligent and Biomechanical Systems State Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua UniversityBeijingChina DFH Satellite Co. Ltd.BeijingChina

The abdomen of a honeybee is a blueprint for bioinspired mechanical design because of its movement flexibility and ***,the abdominal muscles closely related to the movement flexibility mechanism have not been fully identified,limiting the potential biological advantage of their use in bionic mechanism *** this study,we reveal the muscle distribution of the complete muscular driving unit in a honeybee abdomen using stereoscopy and scanning electron microscopy,and the muscle distribution was effectively verified using X-ray tomography.A novel equivalent unit mechanism(EUM)was then proposed and the kinematic analysis indicated that the extension ratio,bending angle,and swing angle of the EUM reached 9.36%,1.22°,and 4.43°,*** deformation ability of the EUM was consistent with the movement of the abdomen,confirming the movement *** work may provide a new perspective for distributed bionic mechanism design.

关键词： bionics equivalent unit mechanism honeybee abdomen movement flexibility muscle

Effects of key factors of rotary triboelectrostatic separator on efficiency of fly ash decarbonization

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International Journal of Mining Science and Technology 2017年第6期27卷 1037-1042页

作者： Tao Youjun zhang ling Tao Dongping Xian Yushuai Sun Qixiao Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining & Technology Xuzhou 221116 China School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China School of Mining Engineering University of Science and Technology Liaoning Anshan 114051 China

On the basis of understanding the principle of rotary triboelectrostatic separation, dynamic analysis of charged fly ash particles aimed at determining the key factors and separation experiments to improve decarbonization efficiency had been carried out Variables of electrode plate voltage and corrected wind speed are the key factors which affect the decarbonization efficiency on the separation of fly ash, The results of separation experiments show that:(1) With the plate voltage increasing, the efficiency of decarbonization continuously rises and in its selected range, the optimal voltage level is 45 KV;(2) The corrected wind speed can impact the efficiency of decarbonization significantly: with the speed increasing, the efficiency of decarbonization shows a trend of first decline, then increase and decrease again, and in its selected range, the optimal speed is 2.0 m/s. This study is of significance for the improvement of rotary triboelectrostatic separation performance and its decarbonization separation efficiency.

关键词： Rotary triboelectrostatic separation Decarbonization Plate voltage Corrected wind speed Fly ash

Rotor orientation direction controls geometric curvature and chirality for assemblies of motor amphiphiles in water

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Aggregate

Aggregate 2023年第2期4卷 237-246页

作者： Yun-Han Yang Yang Qin Yang zhang ling zhang PCFM Lab and GDHPRC Lab School of ChemistrySun Yat-Sen UniversityGuangzhouChina

Control over geometric curvature and chirality of assemblies in pure aqueous media is key to the design of responsive materials and molecular *** we show how aggregate geometric curvature and chirality of motor amphiphiles could be switched from bicontinuous calabashes to nanoribbons or from vesicles to nanoribbons by modulating rotor orientation direction with dual light/heat stimuli to influence spontaneous curvature in *** photoisomerization and thermal helix inversion processes of molecular motors have been studied at the molecular level,and the transformation of supramolecular assemblies has been investigated at the microscopic *** morphological evolution of the calabash-shaped assembly can be kinetically captured,suggesting that the bicontinuous calabash-shaped structures are different from the bowl-shaped aggregates based on solvent-driven assembly upon the addition of non-solvent or *** investigation of dual optical/thermal control of rotor orientation can provide a new strategy for tuning the geometric curvature and chirality of nanoassemblies at the nanoscale,arriving ultimately the clusteroluminescence through-space electronic communication at responsive supramolecular nanosystems.

关键词： aqueous media chiral control curvature control dynamic assemblies molecular motor rotor orientation direction