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Transition parameters of li-like ions(Z=7-11)in dense plasmas

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Chinese Physics B 2021年第5期30卷 328-337页

作者： Xiang-Fu li li-ping jia Hong-Bin Wang Gang jiang College of Electrical Engineering Longdong UniversityQingyang 745000China College of Science Xi'an University of Posts&TelecommunicationsXi'an 710121China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China

The energy levels,transition energies,transition probabilities,weighted oscillator strengths,and line strengths of li-like ions(Z=7-11)in dense plasmas are investigated in this *** relativistic effects and electron correlation effects are described by the MCDHF *** ion sphere model is applied to include the dense plasma screening *** ground configuration 1s^(2)2s and the excited 1s^(2)2p,1s^(2)3l(l=0-2)are *** configuration sets are enlarged until n=7 where the calculated energy levels have *** critical free electron densities of 1s^(2)3d states are *** for 1s^(2)3s-1s^(2)3p transitions,the transition energies for△n=0 increase,and for△n≠0 decrease with increasing free electron *** 1s^(2)3s-1s^(2)3p transitions,the spectra show blue-shift at lower free electron densities and red-shift at higher free electron densities,and the energy level crossing phenomens are observed at higher free electron densities.

关键词： li-like ions energy levels transition energies transition probabilities

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复杂初始应力状态下松砂多向循环单剪特性

岩土力学 2023年第9期44卷 2555-2565页

作者：李尧李嘉评长安大学公路学院陕西西安710064 青岛市政工程设计研究院山东青岛266000

松砂极易液化,微小的应力状态变化也会影响其液化特性。基于多向循环单剪试验,采用松砂作为试验材料,开展不同静剪应力大小、方向和复杂剪切路径下的循环单剪试验,研究复杂初始应力状态下松砂循环单剪特性,得到以下主要结论:(1)随静剪... 详细信息

松砂极易液化,微小的应力状态变化也会影响其液化特性。基于多向循环单剪试验,采用松砂作为试验材料,开展不同静剪应力大小、方向和复杂剪切路径下的循环单剪试验,研究复杂初始应力状态下松砂循环单剪特性,得到以下主要结论:(1)随静剪应力比增大,试样剪应力峰值增大,第1个循环内孔隙水压力增量变大,试样更易液化;初始静剪应力大小对孔隙水压力的影响在剪切初期更显著。(2)随初始静剪应力和动剪应力主轴之间夹角增大,试样在X方向的剪应力峰值减小,试样孔隙水压力加速增长,在第1个循环以及最后1个循环内孔隙水压力增量变大,循环间差值增大,试样更易发生瞬时液化。(3)8字形剪切路径试样的应力-应变滞回圈面积最大,每个循环消耗能量最多,圆形剪切路径次之,直线剪切路径最小。复杂剪切路径会在剪切开始时诱发孔隙水压力的突然增加,加大各循环中孔隙水压力的增量,试样更易液化。(4)影响松砂液化因素的排序为:初始静剪应力与动剪应力夹角、剪切路径、初始静剪应力大小。

关键词：多向循环单剪试验松砂复杂初始应力液化孔隙水压力应力路径应力反转

Molecular epidemiology of coxsackievirus A16 circulating in children in Beijing, China from 2010 to 2019

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World Journal of Pediatrics 2021年第5期17卷 508-516页

作者： Ya-Fang Hu li-ping jia Fang-Yuan Yu li-Ying liu Qin-Wei Song Hui-Jin Dong Jie Deng Yuan Qian lin-Qing Zhao li Deng Hui Huang Ru-Nan Zhu Laboratory of Virology.Beijing Key Laboratory of Etiology of Viral Diseases in Children Capital Institute of Pediatrics2 Yabao RoadChaoyang DistrictBeijing 100020China Department of Clinical Laboratory Shanghai Children's HospitalShanghai Jiaotong UniversityLuding Road 355Putuo DistrictShanghai 200040China Department of Clinical Laboratory Children's Hospital of Capital Institute of Pediatrics2 Yabao RoadBeijing 100020China Department of Infectious Diseases Children's Hospital of Capital Institute of Pediatrics2 Yabao RoadBeijing 100020China

Background Coxsackievirus A16(CVA16)is one of the major etiological agents of hand,foot and mouth discase(HFMD).This study aimed to investigate the molecular epidemiology and evolutionary characteristics of *** Throat swabs were collected from children with HFMD and suspected HFMD during ***(EVs)were detected and typed by real-ime reverse transcription-polymerase chain reaction(RT-PCR)and *** genotype,evolutionary rate,the most recent common ancestor,population dynamics and selection pressure of CVA16 were analyzed based on viral protein gene(VPI)by bioinformatics *** A total of 4709 throat swabs were *** were detected in 3180 samples and 814 were CVA16 *** than 81%of CVA 16-positive children were under 5 years *** prevalence of CVA 16 showed obvious periodic fluctuations with a high level during 2010--2012 followed by an apparent decline during ***,the activities of CVA16 increased gradually during *** the Beijing CVA16 strains belonged to sub-genotype BI,and B Ib was the dominant *** B Ic strain was detected in Bejing for the first time in *** estimated mean evolutionary rate of VPI gene was 4.49x 103 substitution/site/*** gradually fixed at site-23 of VP1 since *** sites were detected under episodic positive selection,one of which(site-223)located in neutralizing linear epitope *** The dominant strains of CVA 16 belonged to clade B lb and evolved in a fast evolutionary rate during 2010-2019 in *** provide more favorable data for HFMD prevention and control,it is necessary to keep attention on molecular epidemiological and evolutionary characteristics of CVA16.

关键词： Coxsackievirus A16 Genetic evolution Molecular epidemiology Phylogenetic analysis

Predisposing factors, diagnosis, treatment and prognosis of cerebral venous thrombosis during pregnancy and postpartum： a case-control study

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Chinese Medical Journal 2011年第24期124卷 4198-4204页

作者： GAO Hui YANG Bao-jun JIN li-ping jia Xiao-fang Department of Obstetrics ＆ Gynecology Beijing Tiantan HospitalCapital Medical University Beijing 100050 China

Keywords pregnancy; puerperium; cerebral venous thromboembolism; anticoagulant agents; thrombolysis Background Previous investigations have demonstrated a relatively low incidence of stroke among young women, though both pregnancy and delivery can substantially increase the risk. Cerebral venous thrombosis may manifest different characteristics during pregnancy and postpartum as a result of their specific physiological statuses. This study aimed to identify the clinical manifestations, diagnosis, treatment, and prognosis of cerebral venous thrombosis during pregnancy and postpartum. Methods We conducted a retrospective analysis of 22 patients with cerebral venous thrombosis who were assigned to either group A （during pregnancy） or group B （during postpartum）. The relevant risk factors, initiation and development of the disease, clinical presentations, diagnosis, treatment, and prognosis were compared between the two stages. Results Cerebral venous thrombosis occurred during both pregnancy and postpartum, but was more common postpartum. Patients in group A had a longer hospitalization period than those in group B. Confirmed predisposing factors in 85.7% of patients of group A were dehydration, infection, and underlying cerebrovascular disorders. No obvious predisposing factors were identified in group B. The most frequent symptom was headache, with epileptic seizures, hemiparalysis and aphasia being less frequent symptoms. Focal neurological symptoms （P=0.022） and cerebral infarction （P=0.014） occurred more frequently in group A than in group B. Anticoagulation therapy proved to be safe for cerebral venous thrombosis patients during puerperium, regardless of parenchymal hemorrhage. However, more attention should be paid to spontaneous in-site placental hemorrhage in pregnant patients. Both groups had similar prognoses （P=1.000）, with 36.3% patients suffering from consequential dysfunction or recurrent intracranial hypertension Delayed diagnosis was associated wi

关键词： pregnancy puerperium cerebral venous thromboembolism anticoagulant agents thrombolysis

Human bocavirus 1 and 2 genotype-specific antibodies for rapid antigen testing in pediatric patients with acute respiratory infections

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World Journal of Pediatrics 2023年第10期19卷 1009-1016页

作者： Ri De Yan-Peng Xu Fang Wang Yu-Tong Zhou Pan-Deng Shi Ru-Nan Zhu Yu Sun li-Ying liu li-ping jia Hui-Jin Dong Hui Zhao Cheng-Feng Qin lin-Qing Zhao Laboratory of Virology Beijing Key Laboratory of Etiology of Viral Diseases in ChildrenCapital Institute of PediatricsBeijing 100020China State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyAcademy of Military Medical SciencesBeijing100071China

Background Previous serological studies of human bocavirus(HBoV)1 could not exclude cross-reactivity with the other three HBoVs,particularly *** To search for genotype-specific antibodies against HBoV1 and HBoV2,the divergent regions(DRs)located on the major capsid protein VP3 were defined through viral amino acid alignment and structure ***-deduced peptides were used as antigens to harvest corresponding anti-DR rabbit *** determine their genotype specificities for HBoV1 and HBoV2,these sera samples were used as antibodies against the antigens VP3 of HBoV1 and HBoV2(expressed in Escherichia coli)in western blotting(WB),enzyme-linked immunosorbent assay(EliSA),and bio-layer interferometry(Bli)***,the antibodies were evaluated with clinical specimens from pediatric patients with acute respiratory tract infection by indirect immunofluorescence assay(IFA).Results There were four DRs(DR1–4)located on VP3 with different secondary and tertiary structures between HBoV1 and *** the reactivity with VP3 of HBoV1 or HBoV2 in WB and EliSA,high intra-genotype cross-reactivity of anti-HBoV1 or HBoV2 DR1,DR3,and DR4,but not anti-DR2,was ***-specific binding capacity of anti-DR2 sera was confirmed by Bli and IFA,in which only anti-HBoV1 DR2 antibody reacted with HBoV1-positive respiratory *** Antibodies against DR2,located on VP3 of HBoV1 or HBoV2,were genotype specific for HBoV1 and HBoV2,respectively.

关键词： Divergent regions Genotype-specific antibody Human bocavirus 1 and 2 Major capsid protein VP3

Clinical value of continuous administration of sorafenib in combination with modified transarterial chemoembolization in patients with unresectable hepatocellular carcinoma

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Chinese Medical Journal 2013年第2期126卷 385-386页

作者： HUANG Yong-hui CHEN Wei li jia-ping CHEN Bin YANG jian-yong Department of Interventional Radiology First Affiliated Hospitalof Sun Yat-sen University Guangzhou Guangdong 510080 China

Hepatocellular carcinoma （HCC） is a major threat to human health in China with high morbidity andmortality. Surgical resection and liver transplantation are the most promising treatments for HCC. The majority of patients, however, are not eligible for surgery due to 1 advanced tumor, multifocal disease or poor liver reserve. Recently, transarterial chemoembolization （TACE） improved survival compared with best supportive care in two individual clinical trials.2 Sorafenib is a multikinase inhibitor that targets both tumor cell proliferation and angiogenesis. The current standard of practice is to treat BCLC stage B HCC with TACE alone and more advanced （BCLC stage C） HCC with sorafenib only.1

关键词： hepatocellular carcinoma, progression-free survival, sorafenib transarterial chemoembolization

Discrete element method for adhesion properties evaluation of deep-sea sediment from macro and micro perspectives

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Journal of Central South University 2022年第5期29卷 1701-1716页

作者： li jia-ping RAO Qiu-hua HUANG Tian-bao MA Wen-bo College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105China Engineering Research Center of Rock-Soil Drilling&Excavation and Protection Ministry of EducationWuhan 430074China School of Civil Engineering Central South UniversityChangsha 410012China

The adhesion between the mining machine and the deep-sea sediments will significantly affect the driving performance of the mining machine in the deep-sea *** the mining machine and the deep-sea sediment interaction simulation was carried out,the accuracy of the particle interaction parameters will directly affect the simulation *** study proposed a method to systematically calibrate the interaction parameters between deep-sea sediment and grouser through the combination of experiment and *** uniaxial compression test and macro adhesion test and corresponding discrete element numerical simulation were carried out,modifying the contact parameters until the simulation results are close to the experimental *** the micro-parameters of the JKR adhesion contact model were back calibrated with the test results,and the contact parameters between soil particle-soil particle and soil particle-metal are ***,the adhesion test shows that the adhesion forces were ranked in the order of 5052ling friction has little effect on adhesion *** it is mainly affected by the coefficient of restitution and surface energy,the surface adhesion force tends to decrease with the increase of the coefficient of restitution and increase with the growth of surface *** obtained parameters of soil particle to soil particle and soil particle to metal affecting the adhesion can contribute to the design optimization for the grouser of mining machines to decrease surface adhesion and enhance its movability and mining efficiency.

关键词： discrete element modelling deep-sea sediment JKR adhesion contact model contact parameters surface adhesion force

Thickness and sp3 bond modulation of（Ti/tetrahedral amorphous carbon）_n multilayer coatings

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Tungsten 2025年第1期7卷 152-160页

作者： Zhi-Jun Xie jia-lin li ling Gong Xiang-li Zhong Hong-jia Song Jin-Bin Wang National-Provincial Laboratory of Special Function Thin Film Materials School of Materials Science and Engineering Xiangtan University

The durability of wear-resistant tetrahedral amorphous carbon（ta-C） coatings is intimately linked to their thickness and the concentration of *** enhance the lifespan of the coatings,we have prepared a multilayer coating consisting of alternating layers of Ti and ta-C,denoted as（Ti/ta-C）_n,using arc ion plating.A multi-layer structure in conjunction with stage cooling is employed to enhance the thickness and promote *** results indicate that the ID/IGvalue,representing the ratio of the intensity of the D peak to that of the G peak in Raman spectroscopy,decreases from 0.85 when no stage cooling is applied to 0.35 when stage cooling is employed,suggesting an enhancement in the fraction of sp3bonds within the *** obtained（Ti/ta-C）_n multilayer coating without peeling off has a maximum thickness of 1.14 μm,which is almost double that of the ta-C coating single layer *** the same time,the coating has a low coefficient of friction,down to 0.069,and maintains excellent friction properties with a wear rate of 3.4×10-6mm3·N-1·*** results conclusively show that the preparation technology can enhance both thickness and sp3bonding in ta-C coatings,significantly expanding their utility across tools,molds,and precision engineering components.

关键词： Arc ion plating Multilayer structure sp3 bond Ta-C coating Wear resistance

Effects of Partially N-acetylated Chitosans to Elicit Resistance Reaction on Brassica napus L.

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Agricultural Sciences in China 2002年第5期1卷 516-519页

作者： ZHANG Xue-kun, TANG Zhang-lin, CHEN li, GUO Yi-hong, CHEN Yun-ping and li jia-na(Agronomy Department, Southwest Agricultural University , Chongqing 400716 , China) Agronomy Department Southwest Agricultural University Chongqing 400716 China

The effects to elicit resistance reaction on oilseed rape (Brassica napus L. cv Xinongchangjiao ) by four partially N-acetylated chitosan 7B, 8B, 9B and 10B (Degree of acetylation (D. A.) is 30% , 20% , 10%, 0%, respectively) and Glycol chitosan (GC, D.A. is 0%) were investigated and compared. Results showed that chitosan were similar to salicylic acid (SA), and could induce resistance reaction, but the reaction was influenced by the degree of acetylation of chitosan. Fully deacetylated chitosans, 10B and GC, elicited chitinase activity, but partially acetylated chitosan, 7B, 8B and 9B, inhibited chitinase activity. Phenyalanine ammonia-lyase (PAL) was also elicited. Elicitor activity increased with on increasing degree of acetylation, 7B induced highest PAL activity among all chitosans. All chitosans induced peroxidase (POD) in a similar level. After elicited by glycol chitosan, like SA treatment, the seedlings increased disease resistance to Sclerotinia sclerotiorum significantly.

关键词： Brassica napus L. Chitosan Degree of acetylation Resistance reaction