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模块式加筋挡土墙的筋板连接试验研究与强度分析

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公路交通科技 2024年第7期41卷 32-39页

作者：刘泽黄振华刘欢楼华锋陈建荣湖南科技大学土木工程学院湖南湘潭411201 浙江数智交院科技股份有限公司浙江杭州310030

筋材与面板的连接强度是影响模块式加筋挡土墙稳定性的重要因素之一。为了探究模块式加筋挡土墙的合理连接方式,设计并制作了平面式、锯齿式和自嵌式3种筋板连接方式。通过拉拔试验测试了3种连接方式的连接强度发展规律和失效模式,再以... 详细信息

筋材与面板的连接强度是影响模块式加筋挡土墙稳定性的重要因素之一。为了探究模块式加筋挡土墙的合理连接方式,设计并制作了平面式、锯齿式和自嵌式3种筋板连接方式。通过拉拔试验测试了3种连接方式的连接强度发展规律和失效模式,再以此基础建立了摩擦型筋板连接的强度计算方法并进行实例分析。结果表明:3种筋板连接方式的连接强度具有基本相同的发展规律,都属摩擦型连接;相同法向应力和表观接触长度下,平面式筋板连接的强度最低;自嵌式连接在线性段的强度高于锯齿式连接,而后者的强度极限高于前者;界面法向应力和筋材锚固长度对连接强度具有重要影响,并存在临界效应:当法向应力小于法向应力临界值且锚固长度小于临界长度时,界面强度与法向应力呈线性关系,筋板连接以筋材拔出而失效;当法向应力大于临界值或锚固长度大于临界长度时,强度包络线为一条水平线,筋板连接以筋材机械损伤后断裂而失效;平面式筋板连接的强度包络线线性段过坐标原点,而锯齿式和自嵌式筋板连接存在一种界面黏聚力;基于试验结果建立了摩擦型筋板连接的强度表达式和模块式加筋挡土墙筋板连接的稳定性分析方法,并进行了实例分析。

关键词：道路工程强度特性试验研究筋板连接模块式加筋挡土墙

改良BLUE方案肺超声评分在机械通气患者中的应用价值

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生物医学工程与临床 2024年第3期28卷 348-353页

作者：秦桂香储鑫吕学东朱保锋陈建荣南通大学第二附属医院急诊科江苏南通226001 南通大学第二附属医院呼吸与危重症医学科江苏南通226001

目的比较改良BLUE方案肺超声评分与传统区域评分法在机械通气患者中的应用优劣,探讨改良BLUE方案与序贯器官衰竭评估(SOFA)评分、氧合指数(OI)的相关性及其对机械通气患者预后评估的价值。方法选择南通大学第二附属医院急诊医学科行机... 详细信息

目的比较改良BLUE方案肺超声评分与传统区域评分法在机械通气患者中的应用优劣,探讨改良BLUE方案与序贯器官衰竭评估(SOFA)评分、氧合指数(OI)的相关性及其对机械通气患者预后评估的价值。方法选择南通大学第二附属医院急诊医学科行机械通气的危重症患者66例,其中男性45例,女性21例;年龄35~95岁,平均年龄72.11岁;病程2~37 d,平均病程12.03 d;疾病类型:肺炎、感染性休克等感染相关19例,心力衰竭16例,慢性阻塞性肺疾病急性发作呼吸衰竭15例,心肺复苏后11例,间质性肺炎2例,中毒2例,外伤1例。根据患者的转归情况(28 d生存或死亡)分为好转组28例与死亡组38例。分别使用改良BLUE方案、4分区、6分区、8分区及12分区评分方法对患者进行肺部超声检查,以12分区评分为对照,分别比较改良BLUE方案、4分区、6分区、8分区超声评分与12分区评分结果的相关性。记录各检查方案检查时间,比较各评分法耗时差异。分析改良BLUE方案与SOFA评分和OI的相关性。比较两组改良BLUE方案肺超声评分差异。结果在机械通气患者中,改良BLUE方案、4分区、6分区、8分区超声评分结果,均与12分区法评分结果呈正相关(r=0.98、0.94、0.96、0.95,P均<0.05),其中改良BLUE方案肺超声评分与12分区评分相关性最高。改良BLUE方案、4分区、6分区、8分区及12分区肺超声检查操作时间分别为(5.86±0.76)min、(4.86±0.71)min、(6.79±0.88)min、(8.18±1.02)min、(11.79±1.45)min,改良BLUE方案较6分区、8分区及12分区操作时间短(P均<0.05)。改良BLUE方案肺超声评分与OI呈负相关,与SOFA评分呈正相关(r=-0.42、0.25)。好转组与死亡组改良BLUE方案肺超声评分平均值分别为(12.04±5.87)分、(15.79±5.94)分。好转组改良BLUE方案肺超声评分明显低于死亡组,差异有统计学意义(P<0.05)。结论在机械通气危重症患者中,使用改良BLUE方案肺超声评分具有准确度高、耗时短的优势,更适宜在急诊环境中对机械通气危重症患者进行快速病情评估。改良BLUE方案肺超声评分对机械通气患者病情严重程度及预后有一定指导价值。

关键词：肺超声肺超声评分改良BLUE方案机械通气

Information from the Kinematics of F and G Stars in the Solar Neighborhood

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Chinese Journal of Astronomy and Astrophysics 2002年第5期2卷 419-428页

作者： Yu-Qin chen, Gang Zhao and jian-rong ShiNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

We have calculated the orbital parameters for 90 stars in chen et al. and updated the kinematic data for stars in Edvardsson et al. by using the accurate Hipparcos parallaxes and proper motions, and recalculated the α-element abundances in Edvardsson et al. in a way consistent with chen et al. The two sets of data are combined in a study of stellar populations and characteristics of F & G stars in the solar neighborhood. We confirm the result of chen et al. that a distinguishable group of stars may belong to the thick disk rather than the thin disk. The ages for the stars are determined using the theoretical isochrones of VandenBerg et al. The age-metallicity relation is investigated for different subgroups according to distance from the sun and galactic orbital parameters. It is found that a mixing of stars with different orbital parameters significantly affect the age-metallicity relation for the disk. Stars with orbits confined to the solar circle all have metallicities [Fe/H] > -0.3 irrespective of their distances from the sun or from the Galactic plane.

关键词： stars: kinematics - Galaxy: evolution - Galaxy: solar neighborhood

Effect and Safety of Acupuncture for Type 2 Diabetes Mellitus:A Systematic Review and Meta-analysis of 21 Randomised Controlled Trials

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Chinese Journal of Integrative Medicine 2022年第5期28卷 463-471页

作者： LI Shu-qing chen jian-rong LIU Mei-lu WANG Yan-ping ZHOU Xu SUN Xin Evidence-Based Medicine Research Centre Jiangxi University of Traditional Chinese MedicineNanchang(330004)China Department of Endocrinology the First Affiliated Hospital of Nanchang UniversityNanchang(330006)China Department of Integrated Chinese and Western Medicine West China HospitalSichuan UniversityChengdu(610041)China Chinese Evidence-Based Medicine Centre West China HospitalSichuan UniversityChengdu(610041)China

Objective:To evaluate the effects of acupuncture on hypoglycaemic outcomes in type 2 diabetes mellitus(T2 DM).Methods:Pub Med,Embase,Cochrane Library,and Clinical *** were searched from inception up to July 2020,to identify randomised controlled trials(RCTs)that enrolled patients with T2 DM and compared acupuncture combined with antidiabetic drugs to antidiabetic drugs *** primary outcomes were haemoglobin A1 c(Hb A1 c)and fasting blood glucose(FBG).The secondary outcomes included 2-h blood glucose(2 h BG),fasting insulin(FINS),homeostatic model assessment for insulin resistance(HOMA-IR),and acupuncture-related adverse *** difference(MD)and 95%confidence interval(CI)were used as the effect measure in the *** quality of evidence was assessed using the Grading of Recommendations Assessment,Development and Evaluation ***:Twenty-one RCTs(n=1,188)were *** meta-analytic results showed that the acupuncture group had greater reductions in FBG(MD-6.46 mg/d L,95%CI-11.95 to-0.98;moderate-quality evidence)and HOMA-IR(MD-1.23,95%CI-2.16 to-0.31;low-quality evidence),but comparable changes in Hb A1 c(MD-0.39%,95%CI-0.84 to 1.61;very-low-quality evidence),2 h BG(MD-4.99 mg/d L,95%CI-20.74 to 10.76;low-quality evidence),and FINS(MD-1.32μIU/m L,95%CI-3.76 to 1.12;low-quality evidence).No data on the incidence of diabetic complications were *** acupuncture-related adverse events reported were ***:The current evidence suggests that acupuncture,as a complementary therapy to antidiabetic drugs,has a small but statistically significant effect on decreasing FBG and improving insulin *** effects of acupuncture on Hb A1 c,2 h BG,and FINS remain *** is generally safe in patients with mild *** evidence for the long-term effects of acupuncture on T2 DM is needed.(Registration ***42018115639)

关键词： acupuncture type 2 diabetes mellitus systematic review meta-analysis

Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra

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Chinese Journal of Astronomy and Astrophysics 2006年第6期6卷 689-696页

作者： Jing-Kun Zhao Gang Zhao Yu-Qin chen jian-rong Shi Yu-Juan Liu Ju-Yong Zhang National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

It is well known that normalization, radial velocity correction and equivalent-width measurement of high-resolution stellar spectra are time-consuming work. In order to improve the efficiency we present an automatic method for these routines. The continuum is determined by fitting the ＇high points＇ in the spectrum. After continuum normalization, the program automatically searches for the position of the Ha line and obtains a rough radial velocity, then computes an accurate radial velocity by cross-correlation between the given spectrum and the solar spectrum. In this method, the equivalent-width is automatically measured using Gaussian fitting. A comparison between our results and those from traditional analysis shows that the typical error for equivalent width is around 3.8% in our method. Developing such automatic routines does not mean to replace the interactive reduction method： it is just for a quick extraction of information from the spectra, especially those obtained in large sky surveys.

关键词： techniques radial velocities - stars abundances

Atomic layer deposition in advanced display technologies:from photoluminescence to encapsulation

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International Journal of Extreme Manufacturing 2024年第2期6卷 65-82页

作者： rong chen Kun Cao Yanwei Wen Fan Yang jian Wang Xiao Liu Bin Shan State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China

Driven by the growing demand for next-generation displays,the development of advanced luminescent materials with exceptional photoelectric properties is rapidly accelerating,with such materials including quantum dots and phosphors,***,the primary challenge preventing the practical application of these luminescent materials lies in meeting the required durability *** layer deposition(ALD)has,therefore,been employed to stabilize luminescent materials,and as a result,flexible display devices have been fabricated through material modification,surface and interface engineering,encapsulation,cross-scale manufacturing,and *** addition,the appropriate equipment has been developed for both spatial ALD and fluidized ALD to satisfy the low-cost,high-efficiency,and high-reliability manufacturing *** strategic approach establishes the groundwork for the development of ultra-stable luminescent materials,highly efficient light-emitting diodes(LEDs),and thin-film ***,this significantly enhances their potential applicability in LED illumination and backlighted displays,marking a notable advancement in the display industry.

关键词： atomic layer deposition display luminescent encapsulation

甲状腺乳头状癌患者血微量元素水平变化及相关性研究

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实用临床医学（江西） 2024年第4期25卷 36-39页

作者：顾琤单远洲时慧森唐斌陈建荣上海市奉贤区中心医院普外科上海201400

目的评估甲状腺乳头状癌与微量元素水平的相关性并筛选发病因素。方法招募2017年10月至2021年10月在上海市奉贤区中心医院住院的甲状腺乳头状癌患者(试验组,n=168)及健康体检人群(对照组,n=156),采集静脉血样本,采用化学发光法测定甲状... 详细信息

目的评估甲状腺乳头状癌与微量元素水平的相关性并筛选发病因素。方法招募2017年10月至2021年10月在上海市奉贤区中心医院住院的甲状腺乳头状癌患者(试验组,n=168)及健康体检人群(对照组,n=156),采集静脉血样本,采用化学发光法测定甲状腺功能及甲状腺自身抗体、电感耦合等离子体发射光谱法检测8种必需微量元素(碘、锌、硒、铜、钼、铬、钴、铁)水平,并比较2组间差异。采用Logistic回归分析,分析甲状腺乳头状癌发病危险因素。结果与对照组相比,试验组甲状腺激素及抗甲状腺过氧化物酶自身抗体水平、血碘及铜水平上升(P<0.05),而血锌及硒水平下降(P<0.05)。Logistic回归分析发现性别为女、血碘升高、血锌及硒水平降低可增加甲状腺乳头状癌的发病风险(P<0.05)。结论甲状腺乳头状癌患者相较于健康人群拥有更高的血碘以及更低的血锌和硒水平,三者水平的改变也增加了甲状腺乳头状癌的发病风险。

关键词：甲状腺乳头状癌微量元素危险因素

维普期刊数据库博看期刊

Anchoring heterometallic cluster on P-doped carbon nitride for efficient photocatalytic nitrogen fixation in water and air ambient

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Chinese Chemical Letters 2024年第4期35卷 176-180页

作者： Chao-Long chen rong chen La-Sheng Long Lan-Sun Zheng Xiang-jian Kong Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Light-driven nitrogen fixation to produce ammonia is a green and economical technology of nitrogen reduction but is still quite challenging, especially in an air atmosphere without any sacrificial ***, we demonstrate efficient photocatalytic nitrogen fixation using water and air directly by loading lanthanide–transition metal(4f–3d) cluster NdCo_(3) on two-dimensional P-doped graphitic carbon nitrides(PCN) material surface. Benefiting from the increase in the number of nitrogen vacancies(NVs) and highly matched band gap structure and excellent hole trapping ability of clusters, the NdCo_(3)/PCN photocatalyst exhibits efficient nitrogen reduction activity with 371(in air) and 825 μmol h^(-1)g^(-1)(in pure nitrogen)without any sacrificial reagents. The introduction of potassium sulfate inhibits hydrogen production and promotes nitrogen reduction activation. This work suggests that anchoring precisely structured clusters on 2D materials may enhance photocatalytic nitrogen reduction under normal temperature and pressure.

关键词： Photocatalytic Nitrogen fixation 4f-3d Cluster Air atmosphere

Empirical likelihood for spatial cross-sectional data models with matrix exponential spatial specification

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 125-139页

作者： LIU Yan rong jian-rong QIN Yong-song Nanning University Nanning 530200China Center for Applied Mathematics of Guangxi and College of Mathematics and Statistics Guangxi Normal UniversityGuilin 541004China

In this paper,we study spatial cross-sectional data models in the form of matrix exponential spatial specification(MESS),where MESS appears in both dependent and error *** empirical likelihood(EL)ratio statistics are established for the parameters of the MESS *** is shown that the limiting distributions of EL ratio statistics follow chi-square distributions,which are used to construct the confidence regions of model *** experiments are conducted to compare the performances of confidence regions based on EL method and normal approximation method.

关键词： MESS empirical likelihood con dence region