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The Ananthakrishna Model Under Non-synchronous Perturbation

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Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1078-1097页

作者： Yi-wen TAO Sue ann camPBELL Jing-li REN School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China Department of Applied Mathematics University of WaterlooWaterloo N2L3G1Canada

The Ananthakrishna model,seeking to explain the Portevin-le Chatelier effect,is studied with or without non-synchronous *** the unperturbed model,Bogdanov-Takens bifurcation and zeroHopf bifurcation are *** the perturbed model,rich dynamical behaviors are given by researching the Poincarémap,including solutions of different periods,quasi-periodic solutions,chaotic solutions,and ***,an augmented temperature-dependent perturbation amplitude induces a transition from non-serrated to serrated flow on the stress-time ***,on the stress-strain curve,the phenomenon of repeated yielding diminishes with an increase in the value of a temperature-dependent parameter,while it persists with an increase in the value of a temperature-independent *** analysis sheds light on the factors exerting the most significant influence on dislocation density.

关键词： Ananthakrishna model serrations non-synchronous perturbation attractor bifurcation

Association between measles antibodies in vaccinated and naturally infected mothers with protective antibodies and the occurrence of measles in their children:A cross-sectional study in the Bavi district of Hanoi

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Asian Pacific Journal of Tropical Medicine 2019年第9期12卷 404-408页

作者： cam Nhat Nguyen Quynh Ngoc Nguyen Than Huu Dao le Thi Quynh Mai Infectious Disease Prevention und Control Department Center for Disease ControlHonoiVietnom Virology Department National Institute of Hygiene and EpidemiologyHanoiVietnam

Objective:To determine the concentration and rate of decay of maternal IgG antibodies against measles prevalence in infants of vaccinated or naturally infected mothers and study initial measles immunization occurs in nine-month-old ***:In total,401 pregnant women and the same number of their subsequent newborns were recruited in the Bavi district of Hanoi in 2016-2017;they were divided into two groups:Older women(born before 1985,n=201)and younger women(born after 1990,n=200).Samples were collected at five time-points;week 36 of pregnancy,birth(cord),and 3,6,and 9 months after ***-specific IgG antibody levels were ***:In total,77.06% of the 401 pregnant women were seropositive for measles-specific IgG antibodies.A significantly greater proportion of mothers aged 30 and older(88.06%)and their newborn(93.53%)were seropositive compared to the mothers aged 25 and younger(66.00%),and their newborn(72.00%)(Ples IgG antibodies than the infants of younger mothers(Ples IgG antibodies together with GMT decreased from 82.97%(506.96)at the age of three months to 23.19%(45.22)at the age of nine ***:This study provides a profile of maternal antibodies against measles in Vietnamese infants and investigates the early susceptibility to measles in both the infants of vaccinated mothers and mothers with naturally acquired *** data suggest that determining the appropriate age for measles vaccination is paramount for the elimination of measles in Vietnam.

关键词： Infant Measles Seropositive National Expanded Program of Immunization Vietnam

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红外双视场镜头的力学及运动学分析

激光与光电子学进展 2024年第13期61卷 368-376页

作者：易乐吴晓君西安建筑科技大学机电工程学院陕西西安710311 西安云视光电科技有限公司陕西西安710000

红外双视场镜头在投入使用之前需进行冲击、振动以及高低温试验,试验中有时会出现各种问题,如镜头被破坏、镜头成像不稳定、镜头运动卡顿等。基于上述问题,对一款焦距为25~75 mm、F数为1.0~1.2的红外双视场镜头进行冲击、振动分析。在... 详细信息

红外双视场镜头在投入使用之前需进行冲击、振动以及高低温试验,试验中有时会出现各种问题,如镜头被破坏、镜头成像不稳定、镜头运动卡顿等。基于上述问题,对一款焦距为25~75 mm、F数为1.0~1.2的红外双视场镜头进行冲击、振动分析。在前人工作的基础上,建立相应的冲击振动模型,基于建立的冲击振动模型对该红外双视场镜头进行相应的仿真分析。对镜头的传动件进行受力分析,提出一种设计凸轮曲线的方法,以减小运动受力,减小凸轮筒在低温下卡死的概率。结合以上工作对该镜头进行相应的冲击振动以及高低温试验,试验结果令人比较满意。研究结果可为红外双视场镜头的仿真分析以及结构设计提供参考,避免因设计阶段中的缺陷造成经济以及时间上的损失。

关键词：红外双视场镜头运动受力分析冲击振动凸轮曲线

Regulation of cytokine gene expression by orosomucoid in neonatal swine adipose tissue

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Journal of Animal Science and Biotechnology 2016年第3期7卷 403-411页

作者： Timothy G.Ramsay Margo J.Stoll le ann Blomberg Thomas J.Caperna Animal Biosciences and Biotechnology Laboratory USDA/ARSBeltsville Agricultural Research CenterUSDABeltsvilieMD 20705USA

Background： Porcine adipose tissue expresses orosomucoid（ORM1） mRNA, a protein with anti-inflammatory and immunomodulatory properties. Previous research has demonstrated that porcine ORM1 can reduce insulin stimulated glucose metabolism in porcine adipose tissue in vitro. The present study was designed to examine the preweaning ontogeny of ORM1 m RNA abundance in porcine subcutaneous adipose and to determine if ORM1 can regulate m RNA abundance of inflammatory cytokines that contribute to insulin resistance in primary cultures derived from neonatal porcine subcutaneous adipose tissue. Cultures were differentiated in vitro and subsequently the adipocyte containing cultures were incubated for 24 h with 0–5000 ng porcine ORM1/m L medium. Cultures were then harvested, total RNA extracted for use in reverse transcription and the m RNA abundance of cytokine m RNA quantified by real-time ***： ORM1 m RNA abundance within neonatal adipose tissue does not change from d 1 to d 21 of age and is a very small fraction relative to liver m RNA abundance. The ORM1 m RNA level in porcine adipocytes and stromalvascular cells are similar（P 〉 0.05）. Treatment with ORM1 did not affect TNFα（tumor necrosis factor α） m RNA level（P 〉 0.05）, while interleukin 6（IL6） m RNA abundance was reduced 32 % at 1,000 ng ORM1/m L（P 〈 0.01）. However,TNFα protein content in the cell culture media was reduced by ORM1 treatment（5,000 ng/m L, P 〈 0.05）, whereas ORM1 had no detectable effect on the media content of IL6（P 〉 0.05）. The reduction of macrophage migration inhibitory factor（MIF） m RNA abundance by ORM1 was dose dependent（P 〈 0.01）. Monocyte chemotactic protein（MCP） m RNA level was reduced 27 % by 1,000 ng ORM1/m L（P 〈 0.05）.Conclusions： The data suggest that ORM1 has limited effects TNFα, IL6, MIF or MCP expression at the concentrations tested. Secondly, these cytokines do not appear to contribute to the reported insulin resistance induced by ORM1 in porcine adipose tissue in vitro as an in

关键词： Adipose Cytokines Neonate Orosomucoid Swine

Hard carbon derived from coconut shells,walnut shells,and corn silk biomass waste exhibiting high capacity for Na-ion batteries

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Journal of Energy Chemistry 2021年第7期30卷 207-218页

作者： Cristina Nita Biao Zhang Joseph Dentzer camélia Matei Ghimbeu Universitéde Haute-Alsace Institut de Science des Matériaux de Mulhouse(IS2M)CNRS UMR 7361F-68100 MulhouseFrance Universitéde Strasbourg F-67081 StrasbourgFrance Center for Advanced Laser Technologies(CETAL) National Institute for LasersPlasma and Radiation PhysicsAtomistilor 409 bisRO-77125 MagureleRomania Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong KongChina Réseau sur le Stockage Electrochimique de l’Energie(RS2E) CNRS FR345933 Rue Saint Leu80039 Amiens CedexFrance

In recent years,hard carbon materials have gained significant interest as anode materials for Na-ion *** waste is considered one of the most interesting,renewable,available,and cost-effective precursor to obtain hard carbon(HC);however,HC properties must be finely tuned to achieve performance comparable to those provided by Li-ion *** this work,three biomass wastes(coconut shells,walnut shells,and corn silk) were evaluated as potential precursors for HC preparation involving a pyrolysis process and subsequent acid washing to remove the inorganic *** obtained materials exhibited low and similar specific surface areas(leading to higher initial coulombic efficiency(iCE).The structural organization was higher in the case of the walnut shell HC,while the corn silk HC revealed a heterogeneous structure combining both highly disordered carbon and localized graphitized *** HCs delivered high initial reversible capacities between 293 and 315 mAh g^(-1) at 50 mA g^(-1) current rate,which remained rather stable during long-term *** best capacity(293 mAh g^(-1) after 100 charge/discharge cycles) and highest capacity retention(93%) was achieved in walnut HCs in half-cells,which could be associated with its higher sp2 C content,better organized structure,and fewer *** "adsorption-insertion" Na storage mechanism is suggested based on several *** walnut HCs exhibited an attractive energy density of 279 Wh/kg when tested in full cells.

关键词： Biomass Pyrolysis Hard carbon Anode Na-ion batteries Energy storage

Optimization, equilibrium, adsorption behavior and role of surface functional groups on graphene oxide-based nanocomposite towards diclofenac drug

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Journal of Environmental Sciences 2020年第7期32卷 137-150页

作者： Thuan Van Tran Duyen Thi cam Nguyen Hanh TNle Dai-Viet NVo Sonil Nanda Trinh Duy Nguyen Nguyen Tat Thanh Hi-Tech Institute Nguyen Tat Thanh UniversityHo Chi Minh City 755414Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials(CE@GrEEN) Nguyen Tat Thanh UniversityHo Chi Minh City 755414Viet Nam Institute of Hygiene and Public Health Ho Chi Minh City 700000Viet Nam Department of Chemical and Biochemical Engineering University of Western OntarioLondonOntarioCanada

Aquatic contamination of diclofenac(DCF),an emergent non-steroidal anti-inflammatory drug(NSAIDs),can result in adverse effects to many ecosystems through ***,introducing effective remediation techniques to sequester the pharmaceutical wastes is highly fundamental to prevent their accumulation in the ***,adsorption has been presented as a green and efficient ***,we report the characterization and application of the novel magnetic nanocomposite(GO@CoFe2O4)derived from cobalt-based ferrite(CoFe2O4)and graphene oxide(GO)for DCF *** the optimization procedure,the response surface methodology(RSM)was adopted to investigate the impacts of DCF concentration(1.6-18.4 mg/L),DCF dosage(0.08-0.92 g/L),and solution pH(2.6-9.4)to find the optimum conditions for DCF removal,at 10.5 mg/L,0.74 g/L,and pH 4,*** the adsorption experiments,the kinetic,isotherm,thermodynamic,and intraparticle diffusion models were systematically ***,we have elucidated the role of functional groups on the surface of GO@CoFe2O4 in enhancing the adsorption of DCF *** good removal efficiency(up to 86.1%),high maximum adsorption capacity(32.4 mg/g),GO@CoFe2O4 can be a potential candidate to eliminate DCF drug from water.

关键词： Diclofenac sodium Graphene oxide Magnetic nanocomposite Response surface methodology Pharmaceuticals adsorption

软木塞基碳量子点的水热合成及其生物相融荧光成像应用

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新型炭材料 2022年第3期37卷 595-602页

作者： Quang Ngo Khoa Hieu Nguyen Ngoc Bao Vo Van Quoc Phuoc Vo Thi Ngoc le Xuan Diem Doc Luong Quang Tri Nguyen Minh Son le Vu Truong Son le Van Thanh Ha Che Thi cam University of Sciences Hue University77 Nguyen HueHueVietnam Faculty of Environmental and Natural Sciences Duy Tan UniversityDa Nang550000Vietnam Institute for Research and Training in Medicine Biology and PharmacyDuy Tan UniversityDa Nang550000Vietnam University of Agriculture and Forestry Hue University102 Phung HungHueVietnam University of Science and Education The University of Da Nang459 Ton Duc ThangLien ChieuDa NangVietnam

以废弃酒瓶软木塞为原料,采用低成本、简单的水热方法合成碳量子点。通过TEM、FTIR、Raman、UV-Vis、PL光谱对碳量子点的结构和光学性能进行分析表征。结果表明,碳量子点的平均直径为6.2±2.7 nm,PL激发谱和碳量子点表面的官能团有关。... 详细信息

以废弃酒瓶软木塞为原料,采用低成本、简单的水热方法合成碳量子点。通过TEM、FTIR、Raman、UV-Vis、PL光谱对碳量子点的结构和光学性能进行分析表征。结果表明,碳量子点的平均直径为6.2±2.7 nm,PL激发谱和碳量子点表面的官能团有关。用硫酸奎宁作为参考,碳量子点的量子效率为1.54%。将获得的碳量子点应用在骨髓间充质干细胞的细胞生物成像上,发现用碳量子点处理后,骨髓间充质干细胞分别在320~380 nm、450~490 nm和450~490 nm范围显示绿色、黄色和红色荧光,表明了碳量子点在荧光成像领域具有潜在的应用价值。

关键词：碳点水热合成荧光荧光图像废酒瓶塞

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完善越南企业所得税立法的思考

完善越南企业所得税立法的思考

作者：黎氏锦绣(le Thi cam Tu) 华南理工大学

学位级别：硕士

中国和越南都是社会主义的国家,两国在政治体制、文化传统和社会制度,尤其在法律制度建设等的方面,存在着一定的相似性。从两国改革开放的时间来看,中国改革开放比越南更早,经济发展得更快,科技水平更高,立法技术更为先进。越南在自改... 详细信息

中国和越南都是社会主义的国家,两国在政治体制、文化传统和社会制度,尤其在法律制度建设等的方面,存在着一定的相似性。从两国改革开放的时间来看,中国改革开放比越南更早,经济发展得更快,科技水平更高,立法技术更为先进。越南在自改革开放以来,越南的法制建设中,参考并借鉴世界许多国家,特别是中国的经验。因此,在两国企业所得税立法领域有着很多相似的规定,当然,由于两国的国情有所不同中越企业所得税法律制度也存在不少的差异。近几年来,中国和越南的关系,特别是两国的贸易与投资关系,发展得更加密切。对两国政府或投资者来说,加强对中国和越南企业所得税法的比较与研究真有十分重要的作用,且在客观上也存在着必要性。所以,本人选择了“完善越企业所得税立法的思考”作为我的毕业论文题目,旨在为完善越南企业所得税立法提供一些有益的建议。作为一名越南留学生来中国留学,在经济法学专业研究生求学期间开始关注于两国企业所得税法的比较研究,并将作为学位论文进行研究,形成论文。主要的研究是就根据中国和越南企业所得税法规进行研究,分析,比较两国企业所得税的优与缺点,然后提出中国企业所得税法对越南的启示为了完善越南企业所得税法的建议。本论文分为四章。第一章是绪论,通过参考较多学者在国内外税法和企业所得税法的研究,分析,比较提出了本论文的研究意义、思路和方法。第二章主要介绍越南改革开放以来企业所得税法的发展、在经济发展中发挥了较多积极作用同时提出了一些存在的问题。第三章,主要在中国企业所得税法的优点,并对统一内外资企业所得税、税收优惠、税前扣除等几个方面作为完善越南企业所得税法的启示。第四章提出了中越企业所得税法的一些基本差异,同时借鉴中国的经验来完善越南企业所得税法的建议。最后是结论。

关键词：中国与越南企业所得税法存在问题完善建议

Development of deep neural network model to predict the compressive strength of FRCM confined columns

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1213-1232页

作者： Khuong le-NGUYEN Quyen Cao MINH Afaq AHMAD Lanh Si HO Department of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam Faculty of Arts and Design University of CanberraBruce ACT 2617Australia Department of Civil Engineering University of Engineering and TechnologyTaxila 47080Pakistan Graduate School of Advanced Science and Engineering Hiroshima UniversityHiroshima 739-8527Japan

The present study describes a reliability analysis of the strength model for predicting concrete columns confinement influence with Fabric-Reinforced Cementitious Matrix(FRCM).through both physical models and Deep Neural Network model(artificial neural network(ann)with double and triple hidden layers).The database of 330 samples collected for the training model contains many important parameters,i.e.,section type(circle or square),corner radius rc,unconfined concrete strength fco,thickness nt,the elastic modulus of fiber Ef,the elastic modulus of mortar *** results revealed that the proposed ann models well predicted the compressive strength of FRCM with high prediction *** ann model with double hidden layers(APDL-1)was shown to be the best to predict the compressive strength of FRCM confined columns compared with the ACI design code and five physical ***,the results also reveal that the unconfined compressive strength of concrete,type of fiber mesh for FRCM,type of section,and the corner radius ratio,are the most significant input variables in the efficiency of FRCM confinement *** performance of the proposed ann models(including double and triple hidden layers)had high precision with R higher than 0.93 and RMSE smaller than 0.13,as compared with other models from the literature available.

关键词： FRCM deep neural networks confinement effect strength model confined concrete