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不锈钢和CFRP混合配筋预应力混凝土梁的延性和变形性能

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工程力学 2005年第3期22卷 190-197页

作者：方志 t.Ivan Campbell 湖南大学土木工程学院湖南长沙410082 department of Civil Engineering Queen’s University Kingston Ontario Canada K7L 3N6

由于FRP(fiber-reinforcedpolymer/Plastics)材料直到拉断还表现出线弹性的力学性能,使得采用FRP配筋的混凝土结构延性较差,且已成为这类结构应用中人们所关注的一个主要问题。研究了不锈钢和CFRP(Carbonfiber-reinforcedpolymer/Plastics)混合配筋部分粘结、部分预应力混凝土梁的延性和变形特性。分析时假定这类梁的截面在加载过程中具有3折线的弯矩-曲率关系,而在卸载过程中截面的弯矩-曲率关系假定为线性,据此提出了这类梁受力全过程的非线性分析方法,并以试验结果验证了其适用性。基于能量耗散的观点引入了反映这类梁延性特性的延性指标,并利用所提分析方法对这类梁的延性进行了参数分析。分析结果表明:增加混凝土极限压应变和预应力束的无粘结部分长度可以有效地增加这类梁的变形性能,但对延性的增加却很有限,而且这两个参数对梁延性和变形性能的影响程度还强烈依赖于梁的破坏形态。

关键词：混凝土预应力不锈钢碳纤维(CFRP) 梁延性

Lactate: an intracellular metabolite regulates cell cycle progression

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Life Metabolism 2023年第4期2卷 1-2页

作者： Jinke Cheng Edward t.H.Yeh department of Biochemistry and Molecular Cell Biology Shanghai Key Laboratory for Tumor Microenvironment and InflammationShanghai Jiao Tong University School of MedicineShanghai 200025China department of Internal Medicine University of Arkansas for Medical SciencesLittle RockAR 72205United States

the Chouchani lab recently reported in Nature that a dynamic intracellular lactate is a physiological regulator for cell cycle *** also showed that accumulated lactate in cell mitosis directly binds and inhibits Sentrin/SUMO-specific pro-tease 1 to enrich SUMO2/3-modification of anaphase-promot-ing complex 4(APC4),which promotes the degradation of APC/C complexes,leading to mitosis exit.

关键词： cycle complexes accumulated

Congenital Malaria in the Borgou/Alibori Regional University teaching Hospital: Myth or Reality?

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Open Journal of Pediatrics 2019年第3期9卷 183-191页

作者： Joseph Agossou Falilatou Agbeille Mohamed Mèdétinmè gérard Kpanidja Alphonse Noudamadjo Julien didier Adédémy Zinsou Rodrigue Ahodègnon department of Mother & Child Faculty of Medicine University of Parakou Parakou Benin Pediatric Unit of the Borgou/Alibori Regional University teaching Hospital Parakou Benin

Introduction: the occurrence of malaria is classically described as uncommon or exceptional in the neonatal period. this work aims to describe the epidemiological, diagnostic, therapeutic, clinical features and outcomes of congenital malaria in the Borgou/Alibori Regional University teaching Hospital (CHUd B/A) located in Parakou. Patients and Methods: this research is a cross-sectional and descriptive study that was conducted in the neonatal intensive care unit of the CHUd B/A from January to december 2017. It included and involved all newborns less than eight (08) days old with positive thick smears. Comorbidities were taken into account to establish the diagnosis of congenital malaria with accuracy. Findings: A total of 170 newborns out of 892 newborns admitted tested positive with Plasmodium falciparum thick smears, i.e., a hospital-based frequency of 19%. the sex ratio was 1.1. the mean age was 22.44 ± 2.72 hours. there was malaria-bacterial infection comorbidity in 39.3% of cases. Among the 91 cases of thick smears testing positive without st.gma of bacterial infection, g6Pd deficiency and fetal-maternal Rhesus incompatibility, the main reasons for admission were prematurity (51.6%), low birth weight (44%), neonatal distress (31.8%) and respiratory distress (15.3%). In addition, the main signs found during the physical examination were neurological disorders or impairments (43.9%), respiratory distress (30%), hyperthermia (12.1%) and jaundice (4.4%). the mean or median parasitemia was 490 parasites/μl, with extremes ranging from 100 to 6500 parasites/μl. treatment was based on artemisinin derivatives. the patient condition improved in 88.7% of cases. Overall mortality was estimated at 11.9%, and the specific mortality was 13.2%. Conclusion: Congenital malaria is a reality that actually prevails in the CHUdB/A. It has become vital and urgent to explore innovative, effective and efficient strat.gies to ensure its management and prevention. A study using PCR as t

关键词： Congenital Malaria Prevention Benin

Automatic seizure detection with different time delays using SdFt and time-domain feature extraction

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the Journal of Biomedical Research 2022年第1期36卷 58-67页

作者： Amal S.Abdulhussien Ahmad t.AbdulSaddaa Kamran Iqbal Communication technical Engineering College Al-Furat Al-Awsat Technical UniversityAl-Najaf 54001Iraq department of System Engineering University of Arkansas at Little RockLittle RockAR 72204USA.

Automatic seizure detection is important for fast detection of the seizure because the way that the expert denotes and searches for seizure in the long signal takes time. the most common way to detect seizures automatically is to use an electroencephalogram(EEg). Many studies have used feature extraction that needs time for calculation. In this study, sliding discrete Fourier transform(SdFt) was applied for conversion to a frequency domain without using a window, which was compared with using window for feature selection. SdFt was calculated for each time series sample directly without any delay by using a simple infinite impulse response(IIR)structure. the EEg database of Bonn University was used to test the proposed method, and two cases were defined to examine a two-classifier feedforward neural network and an adaptive network-based fuzzy inference system. Results revealed that the maximum accuracies were 93% without delay and 99.8% with a one-second delay. this delay accrued because the average was taken for the results with a one-second window.

关键词： EEg seizure detection machine learning sliding discrete Fourier transform

Statistical study of small-scale magnetic holes in the upstream regime of the Martian bow shock

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Statistical study of small-scale magnetic holes in the upstr...

tourniquets do not increase the total blood loss or reamputation risk in transtibial amputations

作者： g.Q.Wang M.Volwerk A.M.du S.d.Xiao M.Y.Wu Y.Q.Chen t.L.Zhang

Small-scale magnetic holes(SSMHs) are frequently observed in the solar wind at 1 AU as well as the terrestrial current sheet and *** kinetic-size structures play an important role in energy dissipation and particle ***,we report the existence of SSMHs in the upstream regime of the Martian bow shock and statistically invest.gate these SSMHs based on 5-year observations of the Mars Atmosphere and Volatile EvolutioN(MAVEN) spacecraft.A total of 549 SSMHs are found,

关键词： Statistical study of small-scale magnetic holes in the upstream regime of the Martian bow shock

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World Journal of Orthopedics 2017年第1期8卷 62-67页

作者： Christian Wied Peter t tengberg gitte Holm thomas Kallemose Nicolai B Foss Anders troelsen Morten t Kristensen depart-ment of Orthopedic Surgery Copenhagen University Hospital Hvidovre Clinical Research Centre Copenhagen University Hospital Hvidovre department of Anesthesiology and Intensive Care Copenhagen University Hospital Hvidovre Physical Medicine and Rehabilita-tion Research--Copenhagen Department of Physical TherapyCopenhagen University Hospital Hvidovre

AIM to invest.gate the total blood loss(tBL) and the safety with respect to the re-amputation rate after transtibial amputation(ttA) conducted with and without a tourniquet. MEtHOdS the study was a single-centre retrospective cohort study of patients with a primary ttA admitted between January 2013 and April 2015. All patients with a primary ttA were assessed for inclusion if the amputation was performed because of arteriosclerosis or diabetic complications. All patients underwent a standardized ttA procedure that was performed approximately 10 cm below the knee joint and performed with sagittalflaps. the pneumatic tourniquet, when used, was inflated around the femur to a pressure of 100 mmH g above the systolic blood pressure. the number of blood transfusions within the first four postoperative days was recorded. the intraoperative blood loss(OBL), which is defined as the volume of blood lost during surgery, was determined from the suction volume and by the weight difference of the surgical dressings. the trigger for a blood transfusion was set at a decrease in the Hgb level g/dL(6 mmol/L). transfusions were performed with pooled red blood cells containing 245 m L per portion, which equals 55 g/L of haemoglobin. the tBL during the first four postoperative days was calculated based on the haemoglobin level and the estimated blood volume. the re-amputation rate was evaluated within 30 d. RESULtS Seventy-four out of 86 consecutive patients who underwent ttA within the two-year study period were included in the analysis. Of these, 38 were operated on using a tourniquet and 36 were operated on without using a tourniquet. there were no significant preoperative differences between the groups. the patients in both groups had a postoperative decrease in their Hgb level compared with preoperative baseline values. the patients operated on using a tourniquet received approximately three millilitres less blood transfusion per kilogram body weight compared with patients o

关键词： total blood loss Intraoperative blood loss transtibial amputation Lower extremity amputation Pneumatic tourniquet Re-amputation

腰椎间盘异常:3.0 t MR定量t_2图与传统检查方式的比较

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国际医学放射学杂志 2011年第1期34卷 93-94页

作者： S.trattnig d.Stelzeneder S.goed M.Reissegger t.C.Mamisch t.Paternostro-Sluga 屈谨 department of Radiology MR Centre-Highfield MRMedical University of Vienna

目的评估腰椎间盘形态学异常与定量t2图(t2 mapping)间的关系。方法腰痛病人53例,中位年龄39岁,行3.0tMRI检查[矢状位t1快速自旋回波序列(FSE)

关键词： MRI 定量t2图 3t 腰椎椎间盘突出

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人与原子

人与原子

Numerical and statistical approach for Casson-Maxwell nanofluid flow with Cattaneo-Christov theory

作者： g.t.·西博格(g.t. Seaborg) W.R.·科利斯(W.R. Corliss)

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Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 1063-1076页

作者： t.MUSHtAQ A.RAUF S.A.SHEHZAd F.MUStAFA M.HANIF Z.ABBAS department of Mathematics COMSATS University IslamabadVehari CampusVehari 61100Pakistan department of Mathematics COMSATS University IslamabadSahiwal CampusSahiwal 57000Pakistan department of Mathematics The Islamia University of BahawalpurBahawalpur 63100Pakistan

the rheological features of an incompressible axi-symmetric Casson-Maxwell nanofluid flow between two stationary disks are *** lower permeable disk is located at z=-a,while the upper disk is placed at z=*** the disks are porous and subjected to uniform *** fluid properties such as thermal conductivity vary with *** Cattaneo-Christov thermal expression is implemented along with the Buongiorno nanofluid *** operating the similarity functions,the reduced form of the fluid model in terms of ordinary differential equations is obtained and solved by the bvp4 c numerical *** physical quantities are demonstrated graphically on the velocity and temperature ***-dimensional flow arrangements and twodimensional contour patterns against several dimensionless variables are also *** numerical values of the local Nusselt and Sherwood numbers for various quantities are presented in tabular *** intensity of the linear relationship between the Nusselt and Sherwood numbers is assessed through Pearson’s product-moment correlation *** statistical implication of the linear association between variables is also examined by the t-test statistic approach.

关键词： Casson-Maxwell fluid porous disk Buongiorno theory variable thermal conductivity Cattaneo-Christov model uniform injection