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Surface defects,stress evolution,and laser damage enhancement mechanism of fused silica under oxygen-enriched condition

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Chinese Physics B 2022年第5期31卷 398-406页

作者： Wei-yuan Luo Wen-Feng Sun Bo Li Xia Xiang xiao-Long Jiang Wei Liao Hai-Jun Wang xiao-dong yuan xiao-dong Jiang xiao-Tao Zu School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China

Oxygen ions(O;)were implanted into fused silica at a fixed fluence of 1×10^(17) ions/cm^(2) with different ion energies ranging from 10 ke V to 60 ke *** surface roughness,optical properties,mechanical properties and laser damage performance of fused silica were investigated to understand the effect of oxygen ion implantation on laser damage resistance of fused *** ion implantation accompanied with sputtering effect can passivate the sub-/surface defects to reduce the surface roughness and improve the surface quality *** implanted oxygen ions can combine with the structural defects(ODCs and E′centers)to reduce the defect densities and compensate the loss of oxygen in fused silica surface under laser ***,oxygen ion implantation can reduce the Si-O-Si bond angle and densify the surface structure,thus introducing compressive stress in the surface to strengthen the surface of fused ***,the laser induced damage threshold of fused silica increases and the damage growth coefficient decreases when ion energy up to30 ke ***,at higher ion energy,the sputtering effect is weakened and implantation becomes dominant,which leads to the surface roughness increase *** addition,excessive energy aggravates the breaking of Si-O *** the same time,the density of structural defects increases and the compressive stress *** will degrade the laser laser-damage resistance of fused *** results indicate that oxygen ion implantation with appropriate ion energy is helpful to improve the damage resistance capability of fused silica components.

关键词： fused silica oxygen ion implantation defect mechanical property laser damage performance

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Non-parabolic effect for femtosecond laser-induced ultrafast electro-absorption in solids

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Chinese Physics B 2020年第1期29卷 446-451页

作者： Li-Bo Liu Hong-Xiang Deng xiao-Tao Zu xiao-dong yuan Wan-Guo Zheng School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China

A theoretical study for femtosecond laser-induced ultrafast electro-absorption of bulk solids is *** numerical results show that,in the case of low intensity of the pump laser where the interaction between the pump laser and solids is in the multi-photon regime,the energy band of solids can be approximately taken as a parabolic band and electro-absorption spectrums from the parabolic band and real band are nearly the ***,in the case of high intensity where the interaction is in the tunneling regime,spectrums from the parabolic band and real band are quite *** physical mechanism for the difference in the tunneling regime is *** find that the non-parabolic parts of the real energy band and Bragger scattering of electrons near the first Brillouin zone boundaries,which are neglected in previous studies,strongly influence the electro-absorption spectrum in the tunneling *** two physical processes cause the difference of *** theoretical results are in accordance with the experiment result.

关键词： ultrafast electro-absorption red-shift of absorption edge Bragger scattering effect multi-photon process

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Drying Shrinkage of Cement-Based Materials Under Conditions of Constant Temperature and Varying Humidity

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Journal of China University of Mining and Technology 2007年第3期17卷 428-431页

作者： MA Bao-guo WEN xiao-dong WANG Ming-yuan YAN Jia-jia Gao xiao-jian Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education Wuhan University of Technology Wuhan Hubei 430070 China

Currently,deformations along the central axis of specimens were usually measured under fixed environmental conditions. Seldom were the effects of environmental factors on the drying-shrinkage deformation of cement-based ma-terial considered. For this paper,the drying-shrinkage deformation at different w/b ratios and different additions to mor-tars was investigated under different environments at a temperature of 20 ℃ and humidity ranging from 100% to 50%. The specimens were cured in water for 28 days before measurement. The results illustrate that mortar shows much less shrinkage under various drying conditions when a lower w/b ratio is adopted. With a decrease in relative humidity the speed of drying-shrinkage becomes gradually lower. The addition of silica fume reduces the drying-shrinkage of mortar under higher relative humidity,because the pore structure of mortar with silica fume becomes more refined. The addi-tion of fly ash increases the total porosity and the volume of coarse pores in the mortar. The drying-shrinkage of mortar under different conditions increases with the addition of more of fly ash.

关键词： humidity variation volume deformation pore structure

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Compensatory recombination phenomena of neurological functions in central dysphagia patients

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Neural Regeneration Research 2015年第3期10卷 490-497页

作者： xiao-dong yuan Li-fu Zhou Shu-juan Wang Yan-sheng Zhao xiao-jie Wang Li-li Zhang Shou-hong Wang Ya-jie Zhang Li Chen Department of Neurology Affiliated Kailuan General Hospital of Hebei United University Department of MRI Room Affiliated Kailuan General Hospital of Hebei United University

We speculate that cortical reactions evoked by swallowing activity may be abnormal in patients with central infarction with dysphagia. The present study aimed to detect functional imaging features of cerebral cortex in central dysphagia patients by using blood oxygen level-depen- dent functional magnetic resonance imaging techniques. The results showed that when normal controls swallowed, primary motor cortex （BA4）, insula （BA13）, premotor cortex （BA6/8）, supramarginal gyrus （BA40）, and anterior cingulate cortex （BA24/32） were activated, and that the size of the activated areas were larger in the left hemisphere compared with the right. In re- current cerebral infarction patients with central dysphagia, BA4, BA13, BA40 aild BA6/8 areas were activated, while the degree of activation in BA24/32 was decreased. Additionally, more areas were activated, including posterior cingulate cortex （BA23/31）, visual association cortex （BA18/19）, primary auditory cortex （BA41） and parahippocampal cortex （BA36）. Somatosen- sory association cortex （BA7） and left cerebellum in patients with recurrent cerebral infarction with central dysphagia were also activated. Experimental findings suggest that the cerebral cortex has obvious hemisphere lateralization in response to swallowing, and patients with recurrent cerebral infarction with central dysphagia show compensatory recombination phenomena of neurological functions. In rehabilitative treatment, using the favorite food of patients can stimu- late swallowing through visual, auditory, and other nerve conduction pathways, thus promoting compensatory recombination of the central cortex functions.

关键词： nerve regeneration blood oxygen level-dependent functional magnetic resonance imag-ing cerebral ischemia dysphagia function restructuring cerebral cortex neural regeneration

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Molecular Dynamics Study of the Structural Modification of Porous Silica from Low-Energy Recoils

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Chinese Physics Letters 2019年第11期36卷 44-47页

作者： Ji-Hua Zhang Ye Tian Wei Han Fang Wang Fu-Quan Li xiao-dong yuan Xia Xiang School of Physics University of Electronic Science and Technology of ChinaChengdu 610054 Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900

Molecular dynamics simulations are performed to investigate the effects of low-energy recoils on the microscopic structure of porous silica. Exhibiting a logistic growth with the recoil energy, the displacement probability of Si is shown to be smaller than that of O at the same primary knock-on level. Computations of pair distribution functions and bond angle distributions reveal that this material upon irradiation with energies around the displacement thresholds mainly undergoes structural changes in the medium-range order. In the porous network,while the formation of nonbridging oxygen defects tends to induce shorter Si–O bonds than those formed by bridging oxygen atoms, a remarkable increase of inter-tetrahedral bond angles created by multiple recoils can be observed and associated with the rearrangement of ring statistics.

关键词： bridging Molecular porous

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Molecular Cloning and Characterization of cDNA Encoding Fibrinolytic Enzyme-3 from Earthworm Eisenia foetida

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Acta Biochimica et Biophysica Sinica 2004年第4期36卷 303-308页

作者： Guo-Qing dong, xiao-Ling yuan, Ya-Jun SHAN, Zhen-Hu ZHAO, Jia-Pei CHEN, and Yu-Wen CONG* Department of Experimental Therapy of ARS, Beijing Institute of Radiation Medicine, Beijing 100850, China Department of Experimental Therapy of ARS Beijing Institute of Radiation MedicineBeijing 100850 China

The earthworm fibrinolytic enzyme-3 (EFE-3, GenBank accession No: AY438622), from the earthworm Eisenia foetida, is a component of earthworm fibrinolytic enzymes. In this study, cDNA encoding the EFE-3 was cloned by RT-PCR. The cDNA contained an open reading frame of 741 nucleotides, which encoded a deduced protein of 247 amino acid residues, including signal sequences. EFE-3 showed a high degree of homology to earthworm (Lumbricus rebullus) proteases F-III-1, F-III-2, and bovine trypsin. The recombinant EFE-3 was expressed in E. coli as inclusion bodies, and the gene encoding the native form of EFE-3 was expressed in COS-7 cells in the medium. Both the refolding product of inclusion bodies and the secreted protease could dissolve the artificial fibrin plate.

关键词： earthworm Eisenia foetida earthworm fibrinolytic enzyme cloning expression refolding

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Grandparent-provided childcare and labor force participation of mothers with preschool children in Urban China

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China Population and Development Studies 2019年第2期2卷 347-368页

作者： Fenglian Du xiao‑yuan dong Yinyu Zhang Inner Mongolian University HohhotChina University of Winnipeg WinnipegCanada

This paper investigates the effects of grandparent-provided childcare and the access to daycare services on the labor force participation of mothers with children under 7 years old in urban *** two-stage residual inclusion method,the analysis finds that grandparent-provided childcare and the access to daycare services both have strong positive effects on maternal labor force participation(MLFP).Specifically,having grandparent-provided childcare increases MLFP by 38-43%,whereas having access to daycare services increases MLFP by 24-29%.The analysis also finds that having a healthy grandmother is a significant determinant in whether grandparent-provided childcare is utilized and that the demand for grandparent-provided childcare is higher in localities in which daycare services for children under 3 years old are more *** results indicate that grandparents,particularly grandmothers,play an important role in sustaining MLFP,particularly as the supply of publicly funded daycare programs is declining.

关键词： Grandparent-provided childcare Labor force participation Two-stage residual inclusion(2SRI)method

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Selections from Mr. DU xiao-shan's Clinical Experience in Acupuncture

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Journal of Acupuncture and Tuina Science 2003年第6期1卷 3-5页

作者： DU Liang-dong xiao yuan-chun TCM Hospital of Wuxi City Jiangsu China 214001

DU xiao-shan, senior consult doctor, visiting professor of Nanjing University of TCM, tutor of the successor of senior TCM experts' experience, and he is granted the special allowance of State DepartmentMr. DU xiao-shan has been engaged in medical practice for more than sixty years. He has a good command of medical theories and excellent skills of clinical practice. Diagnostically, he combines syndrome differentiation and disease differentiation; therapeutically, he prescribes acupoints and needling techniques in accordance with the etiology and pathogenesis. Especially, he develops and refines some needling techniques on the basis of the classic ones, which are of great value in his clinical practice. I have been following Mr. DU for a long time and achieved certain success. I now present several proven prescriptions below.Author: DU Liang-dong (1957-), male, attending physicianTranslator: X{upiao} yuan-chun

关键词： clinical practice syndrome differentiation

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Acupuncture Therapy for Multiple Infarctional Dementia

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Journal of Acupuncture and Tuina Science 2003年第1期1卷 22-24页

作者： SHEN Wei-dong xiao yuan-chun Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shanghai 200020 China

Purpose To observe the clinical efficacy of combined electro-acupuncture and moxibustion in the treatment of multiple infarctional *** Eighty-eight patients were randomized into two groups: treatment group in which 48 cases were treated by combined electro-acupuncture and moxibustion and control group in which 40 cases were treated by oral administration of Huperzine *** The total effective rate was 90% in treatment group and 71% in control group, with a significant difference (Pdong (1967-), male, junior consultant doctorTranslator: xiao yuan-chun

关键词： Dementia, Multi-infarct Acupuncture-moxibustion Drug Therapy

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Epidemiological and Clinical Characteristics of 28 Cases of Cholera

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国际感染病学（电子版） 2014年第1期3卷 35-37页

作者： Zhong-ying Bao xiao-ming xiao-dong yuan Shu-hong Duan Department of Infectious Diseases Beijing Shijitan Hospital Capital Medical University (The 9th Hospital Affiliated to Peking University)

The data of 35 246 patients with intestinal diseases were retrospectively analyzed, 28 cases of cholera patients were screened in 17 years, of which 23 cases had suspicious unclean food history, 10 cases were migrant workers, 8 cases had history of coastal city tour in one week. All of the 28 patients were positive for Vibrio cholerae culture, 19 cases were identified as O1 serotype Ogawa and 6 were identified as O1 serotype Inaba, 3 were identified as O139. Twenty-three patients were mild, five cases were moderate, patients with severe diseases were not found. It was found in this study that O1 serotype Vibrio cholerae was still dominant, 82% of cholera patients were mild cases. Tourists who had a incompletely heated seafood intake history and migrant people are susceptible to cholera.

关键词： Cholera Epidemiology Clinical characteristics

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