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Slippery hydrogel with desiccation-tolerant‘skin’for high-precision additive manufacturing

International Journal of Extreme Manufacturing 2024年第2期6卷 486-500页

作者： Desheng Liu Pan Jiang Yue hu Yaozhong Lu Yixian Wang Jiayu Wu Danli hu Tao Wu Xiaolong Wang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000People’s Republic of China CAS Key Laboratory of Chemistry of Northwestern Plant Resources Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000People’s Republic of China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantai 264006People’s Republic of China Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003People’s Republic of China

Hydrogels inevitably undergo dehydration,structural collapse,and shrinkage deformation due to the uninterrupted evaporation in the atmosphere,thereby losing their flexibility,slipperiness,and manufacturing ***,we propose a novel bioinspired strategy to construct a spontaneously formed‘skin’on the slippery hydrogels by incorporating biological stress metabolites trehalose into the hydrogel network,which can generate robust hydrogen bonding interactions to restrain water *** contents of trehalose in hydrogel matrix can also regulate the desiccation-tolerance,mechanical properties,and lubricating performance of slippery hydrogels in a wide *** vat photopolymerization three-dimensional printing and trehalose-modified slippery hydrogels enables to achieve the structural hydrogels with high resolution,shape fidelity,and sophisticated architectures,instead of structural collapse and shrinkage deformation caused by *** thus,this proposed functional hydrogel adapts to manufacture large-scale hydrogels with sophisticated architectures in a long-term *** a proof-of-concept demonstration,a high-precision and sophisticated slippery hydrogel vascular phantom was easily fabricated to imitate guidewire ***,the proposed protocol is universally applicable to diverse types of hydrogel *** strategy opens up a versatile methodology to fabricate dry-resistant slippery hydrogel for functional structures and devices,expanding their high-precision processing and broad applications in the atmosphere.

关键词： slippery hydrogel trehalose desiccation tolerance vat photopolymerization 3D printing hydrogen bonding

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An unconstrained optimization method using nonmonotone second order Goldstein's line search

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Science china mathematics 2007年第10期50卷 1389-1400页

作者： Wen-yu SUN~(1+) Qun-yan ZHOU~(1,2. ~1 School of mathematics and Computer Science,Nanjing Normal University,Nanjing 2.0097,china ~2.{2. of Basic Courses,Jiangsu teachers University of Technology,Changzhou 2.3001,china 1. School of mathematics and Computer Science Nanjing Normal University Nanjing 210097 China 2. department of Basic Courses Jiangsu Teachers University of Technology Changzhou 213001 China

In this paper, an unconstrained optimization method using the nonmonotone second order Goldstein's line search is proposed. By using the negative curvature information from the Hessian,the sequence generated is shown to converge to a stationary point with the second order optimality conditions. Numerical tests on a set of standard test problems confirm the efficiency of our new method.

关键词： nonmonotone method, direction of negative curvature, line search, descent pair,unconstrained optimization

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ON THE RELIABILITY OF MEDIUM LOGIC(ML)

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模糊系统与数学 1989年第2期 60-68页

作者： Pan Zhen—hua department of {2. Xingyi teachers’ College, Gueizhou, china)

Medium logic (ML) is set up for the common theoritical foundation of the classical mathematics and fuzzy mathematics. It has been formalized as a new theory of logic. See note (1) and note (2.. As mathematical logic the ML’s construct reches the study of the informal deductive inference by means of studying the formal inference in it, and it demands the formal inference of ML reliable reflected the deductive inference. For this reason, this paper deals with its reliability. The result shows that the formal inference of M L consists with deductive inference, and that ML reliably reflects the deductive inference.

关键词： Medium logic Reliability Formal inference Deductive inference Formal proof.

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Diophantine equation x^2.+ 2.m =y^n

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Chinese Science Bulletin 1997年第18期42卷 1515-1517页

作者： LE Maohuadepartment of {2., Zhanjiang teachers College, Zhanjiang 52.048, china department of mathematics Zhanjiang Teachers College Zhanjiang China

LET Z,N,Q be the sets of integers, positive integers and rational numbers, respectively. The solutions (x, y, m, n) of the exponential Diophantine equation X^2.2.m=y^n,x,y,m,n∈N,2.,n2.(1)are connected with many questions in number theory and combinatorial theory. In the recent fifty years, there were many papers concerned with the equation written by Ljunggren, Nagell, Brown, Toyoizumi and Cohn. In 1986, ref. [1] claimed that all solutions of (1) had been determined. However, we have not seen the proof so far. Therefore, the solution of (1) has not been found yet. In this note, using Baker’s method, we prove the following result.

关键词： exponential Diophantine equation positive integer solution Baker’s method.

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Normalized and self-normalized Cramér-type moderate deviations for the Euler-Maruyama scheme for the SDE

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Science china mathematics 2024年第8期67卷 1865-1880页

作者： Xiequan Fan Haijuan hu Lihu Xu Center for Applied mathematics Tianjin UniversityTianjin 300072China School of mathematics and Statistics Northeastern University at QinhuangdaoQinhuangdao 066004China department of mathematics Faculty of Science and TechnologyUniversity of MacaoMacaoChina

In this paper,we establish normalized and self-normalized Cramér-type moderate deviations for the Euler-Maruyama scheme for *** to our results,Berry-Esseen's bounds and moderate deviation principles are also *** norm... 详细信息

关键词： Euler-Maruyama scheme Cramer-type moderate deviations self-normalized sequences Berry-Esseen’s bounds

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Bridging the Fabry–Perot cavity and asymmetric Berreman mode for long-wave infrared nonreciprocal thermal emitters

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Science china Technological Sciences 2024年第10期67卷 3285-3293页

作者： CHEN ZiHe YU ShiLv hu Run School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology department of Applied Physics Kyung Hee University

The long-wave infrared band(8–14 μm) is essential for several applications, such as infrared detection, radiative cooling, and near-field heat transfer. However, according to Kirchhoff's law, the intrinsic balance between thermal absorption and emission limits the further improvement of photon energy conversion and thermal management. Thus, breaking Kirchhoff's balance and achieving nonreciprocal thermal radiation in the long-wave infrared band are necessary. Most existing designs for nonreciprocal thermal emitters rely on grating or photonic crystal structures to achieve nonreciprocal thermal radiation at narrow peaks, which are relatively complex and typically realize bands larger than 14 μm. Here, a sandwich structure consisting of an epsilon-nearzero(ENZ) magneto-optical layer(MOL), a dielectric layer(DL), and a metal layer is proposed to achieve a strong nonreciprocal effect in the long-wave infrared band, which is mainly attributed to the strengthening of the asymmetric Berreman mode by the Fabry–Perot cavity. In addition, the impact of the incident angle, DL thickness, and DL refractive index on the nonreciprocal thermal radiation has been investigated. Moreover, by replacing the ENZ MOL with the gradient ENZ MOL, the existence of the DL can further improve the nonreciprocity of the broadband nonreciprocal thermal radiation. The proposed work promotes the development and application of nonreciprocal energy devices.

关键词： long-wave infrared band nonreciprocal thermal radiation sandwich structure Fabry–Perot cavity asymmetric berreman mode

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Preparation and Tribological Properties of Onion-like Carbon/Waterborne Polyurethane Coatings

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china Petroleum Processing & Petrochemical Technology 2024年第2期26卷 108-120页

作者： Fei Xingpeng Jiang Wuhao Wen Maosheng Xu Yong hu Kunhong hu Enzhu department of Energy Materials and Chemical Engineering Hefei UniversityHefei 230601China Anhui Province Key Laboratory of Critical Friction Pair for Advanced Equipment Hefei 230088China

Rice husk powder was used as a carbon source in a high-temperature carbonization reaction for the production of rice husk ash(RHA).Under the catalysis of ferric nitrate,onion-like carbon(OLC)nanomaterial with a particle size of approximately 2.0 nm was successfully prepared and incorporated into waterborne polyurethane(WPU).The tribological properties of the coatings were determined using a controlled-atmosphere tribometer(WMT-2.)under dry-friction *** the friction test,the friction mechanism was investigated by characterizing the abrasive spot surfaces of the test samples using 3D laser microscopy and scanning electron microscopy/energy dispersive *** final results demonstrated that the thermal stability of WPU composite coatings containing various concentrations of OLC nanoparticles was significantly enhanced,binding forces between coatings and steel sheets increased,and hardness improved compared to pure WPU *** tests revealed a notable enhancement in the anti-wear properties of WPU coatings due to the presence of OLC ***,the wear rate of the 1.5%OLC/WPU coating was reduced by 45.3%.The coating’s anti-wear mechanism was attributed to the improvement in the mechanical properties of WPU due to OLC,as well as OLC’s participation in the formation of a transfer film under induced friction,which protected the matrix.

关键词： biomass carbon onion-like carbon waterborne polyurethane wear transfer films

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REMARK ON BLOCH FUNCTION AND NORMAL FUNCTION

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Systems Science and Mathematical Sciences 1997年第2期10卷 133-140页

作者： XIAO Zhijing (department of mathematics, Guangzhou {2. College, Guangzhou 510400, china) 广州师院学院数学系广东广州

In this paper, we give characterizations for Bloch and normal functions. These caracterizations generalize the results of [1].

关键词： Bloch function normal function complex plane.

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Current status of early gastric cancer screening research

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Cancer Biology & Medicine 2024年第3期21卷 218-222页

作者： Can hu Li Yuan Xiangdong Cheng department of Gastric surgery Zhejiang Cancer HospitalHangzhou Institute of Medicine(HIM)Chinese Academy of SciencesHangzhouZhejiang 310022China Key Laboratory of Prevention Diagnosis and Therapy of Upper Gastrointestinal Cancer of Zhejiang ProvinceHangzhou 310022China Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer Zhejiang Cancer HospitalHangzhou 310022China

Gastric cancer is a predominant threat to the health and well-being of china's residents. Data from the World Health Organization(WHO) in 2.2. revealed that gastric cancer in china notably accounted for 44.0% of new c... 详细信息

关键词： cancer Gastric gastric

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Endomorphism Algebras of Support τ-Tilting Modules

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Algebra Colloquium 2024年第2期31卷 333-340页

作者： Yonggang hu Panyue Zhou Nanqing Ding department of International Economics China Foreign Affairs University Beijing 100037China School of mathematics and Statistics Changsha University of Science and Technology Changsha 410114China 不详

Let A be a finite dimensional k-algebra and T be a supportτ-tilting right *** this note,we give lower and upper bounds for the global dimension of the endomorphism algebra End_(A)(T)under some mild ***,we give some e... 详细信息

关键词： supportτ-tilting module τ-tilting module tilting module global dimension

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