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新媒体环境下汽车营销模式研究

内燃机与配件 2024年第1期 116-118页

作者：张钦裕河南工业贸易职业学院河南郑州450000

营销观念的正确与否直接关系到汽车企业的兴衰,汽车企业应该充分利用新媒体的优势,重新构建一套营销模式。深化汽车企业营销变革,转变营销理念,提升企业在汽车市场中的竞争力。对新媒体环境下汽车营销模式的优势及不足进行分析,为汽车... 详细信息

营销观念的正确与否直接关系到汽车企业的兴衰,汽车企业应该充分利用新媒体的优势,重新构建一套营销模式。深化汽车企业营销变革,转变营销理念,提升企业在汽车市场中的竞争力。对新媒体环境下汽车营销模式的优势及不足进行分析,为汽车企业转变营销模式,重新制定营销策略提供参考依据。根据新媒体特点和企业自身的状况制定出科学合理的汽车营销模式,为企业创造更大的经济效益。

关键词：汽车营销新媒体营销策略目标客户

鼻咽癌合并EB病毒感染外周血LMP-1、p53和Ki67表达与疾病进展的相关性

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中华医院感染学杂志 2024年第2期34卷 239-242页

作者：周雪詹雨薇武正菊余钥余威张玉琴西南医科大学附属医院肿瘤科四川泸州646000 西南医科大学附属医院感染管理部四川泸州646000 西南医科大学附属中医医院检验科四川泸州646000 泸州市人民医院肿瘤科四川泸州646000

目的探讨鼻咽癌合并EB病毒感染外周血潜伏膜蛋白1(LMP-1)、p53、Ki67表达水平与疾病进展的相关性。方法选择2019年1月—2022年3月在西南医科大学附属医院肿瘤科确诊为鼻咽癌患者120例为研究对象,其中合并EB病毒感染患者85例纳入感染组,3... 详细信息

目的探讨鼻咽癌合并EB病毒感染外周血潜伏膜蛋白1(LMP-1)、p53、Ki67表达水平与疾病进展的相关性。方法选择2019年1月—2022年3月在西南医科大学附属医院肿瘤科确诊为鼻咽癌患者120例为研究对象,其中合并EB病毒感染患者85例纳入感染组,35例未感染患者纳入对照组,检测患者外周血LMP-1、p53、Ki67表达水平及其与鼻咽癌患者合并EB病毒感染临床特征的关系。结果感染组患者LMP-1、p53和Ki67阳性表达率均高于对照组(P<0.05);LMP-1、p53和Ki67阳性表达与性别、年龄、T分期、病理类型、临床分期、淋巴结转移无相关性,与N分期具有相关性(P<0.05),且N分期越高,阳性表达率越高(P<0.05),远处转移患者阳性表达率高于未远处转移患者(P<0.05)。结论鼻咽癌合并EB病毒感染患者外周血LMP-1、p53、Ki67阳性表达率升高,并与临床N分期、淋巴结远处转移具有相关性。

关键词：鼻咽癌 EB病毒血潜伏膜蛋白1 p53致癌基因 Ki67致癌基因

Study of a smart platform based on backstepping control method

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 599-608页

作者： Li Luyu Cheng Baowei zhang yu qin Han State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China School of Civil Engineering Dalian University of Technology Dalian 116024 China School of Electronic Engineering Dalian University of Technology Dalian 116024 China

A structural model is significant for the verification of structural control algorithms. However, for nonlinear behavior, experiments are mostly destructive tests that are costly, and conducting repetitive structural experiments is difficult. Therefore, a repetitive structural vibration model is important for structural vibration control. In this study, a smart platform to realize different structural behaviors is developed based on the backstepping control algorithm. Lyapunov functions are used to derive the control law. Simulations show that the designed model can track the structural responses of different arbitrary linear structures very well. In addition, the proposed platform can track responses of different piecewise linear structures and desired models with various hysteresis very well. Numerical results verify the effectiveness of the proposed tracking controller through the backstepping method for the established platform.

关键词： repetitive model backstepping controller piecewise linear hysteresis

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一种鉴别栽培柿品种SNP标记的新方法

生物技术通报 2024年第1期40卷 160-167页

作者：梁晋军朱溯远张宇琴张鹏飞温鹏飞杨运良山西农业大学园艺学院太谷030801 山西农业大学棉花研究所运城044000

【目的】为了鉴别栽培柿品种间的遗传差异,开发一种基于核糖体DNA内转录间隔区(nrDNA internally transcribed spacer)序列简单、高效的SNP分子标记新方法,为种质的收集、利用及推广应用提供参考。【方法】以18种六倍体栽培柿品种叶片... 详细信息

【目的】为了鉴别栽培柿品种间的遗传差异,开发一种基于核糖体DNA内转录间隔区(nrDNA internally transcribed spacer)序列简单、高效的SNP分子标记新方法,为种质的收集、利用及推广应用提供参考。【方法】以18种六倍体栽培柿品种叶片为试材,对其ITS区进行扩增测序,并分析序列差异,最后用Sau96 I限制性内切酶对151处杂合位点进行酶切验证。【结果】18份柿品种ITS长度均为730 bp,共存在6个杂合位点,分别在151、168、205、278、279和622 bp处。六倍体柿杂合位点处碱基峰图面积比例存在一定的规律,即C∶T=2∶1、C∶T=1∶1、C∶T=1∶2和A∶G=1∶1,利用出现的杂合位点及其峰图面积比例规律差异将18份栽培柿品种分成11类。【结论】151处位点的酶切结果验证了酶切产物浓度与峰图面积比例一致。这种基于nrDNAITS序列SNP分子标记的新方法能将18份栽培柿品种分成11类。

关键词：栽培柿 nrDNAITS SNP 杂合位点遗传差异

解毒化瘀颗粒调控ROS-NLRP3信号通路缓解肝衰竭大鼠肝脏炎症应激的实验研究

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时珍国医国药 2024年第5期35卷 1025-1029页

作者：吴智鹏张荣臻王明刚张钰琴王秀峰广西中医药大学研究生院广西南宁530200 广西中医药大学第一附属医院广西南宁530023 广西医科大学基础医学院细胞生物学与遗传学教研室广西南宁530021

目的分析解毒化瘀颗粒(JDHY)通过调控ROS-NLRP3信号通路改善肝衰竭大鼠肝脏炎症反应的相关分子机制。方法将36只雄性Wistar大鼠随机分为空白组(Control)、模型组(Model)、解毒化瘀颗粒组(JDHY),每组各12只。采用D-氨基半乳糖(D-GalN)联... 详细信息

目的分析解毒化瘀颗粒(JDHY)通过调控ROS-NLRP3信号通路改善肝衰竭大鼠肝脏炎症反应的相关分子机制。方法将36只雄性Wistar大鼠随机分为空白组(Control)、模型组(Model)、解毒化瘀颗粒组(JDHY),每组各12只。采用D-氨基半乳糖(D-GalN)联合脂多糖(LPS)一次性腹腔注射建立急性肝衰竭大鼠模型。JDHY组在造模前给予JDHY(57.55 g·kg^(-1)·d^(-1)),连续灌胃72h并延续至造模后24h。造模后24h处死各组大鼠,收集血清及组织样本,采用全自动生化分析仪测定血清ALT、AST和TBIL水平,ELISA测定血清IL-1β和IL-18,评估ROS生成,免疫组织化学分析肝组织NLRP3和GSDMD表达,蛋白质印迹分析肝组织NLRP3、GSDMD、GSDMD-N、ASC和Caspase-1表达。结果JDHY能有效改善肝衰竭大鼠肝功能(ALT、AST、TBIL)(P<0.05),减少ROS过度产生(P<0.05)和炎症因子(IL-1β、IL-18)释放。此外,与模型组比较,JDHY降低了肝衰竭大鼠肝组织中NLRP3、GSDMD、GSDMD-N、ASC和Caspase-1的表达(P<0.05)。结论JDHY能抑制ROS-NLRP3信号通路过度激活、减少促炎因子释放,缓解肝脏炎症应激水平从而拮抗肝衰竭。

关键词：解毒化瘀颗粒 ROS-NLRP3炎症小体信号通路肝衰竭

Heterogeneous MXene-based films with graded electrical conductivity towards highly efficient EMI shielding and electrothermal heating

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Nano Research 2024年第8期17卷 7264-7274页

作者： yu zhang Guangcheng zhang Zhonglei Ma Jianbin qin Xi Shen Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research Institute for Sports Science and Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

The increasing need for electromagnetic interference(EMI)shielding of electronics in cold environments such as those in aircraft,space exploration,and wearable heaters to avoid hazardous icing conditions or hypothermia requires the development of thin and lightweight EMI shielding materials preferably by absorbing rather than reflecting electromagnetic(EM)waves while also generating heat through energy-efficient electrothermal ***,it is challenging to achieve absorption-dominant EMI shielding and energy-efficient electrothermal heating simultaneously in a thin and lightweight ***,we develop a heterogeneous composite film comprising a porous multi-walled carbon nanotubes(MWCNTs)/bacterial cellulose(BC)film and an aligned MXene/Ag nanowires(NWs)backing via a sequential vacuum filtration *** porous film contains random conductive networks of MWCNTs with moderate conductivity while the aligned MXene sheets atop Ag NWs network affords high conductivity in the backing,giving rise to graded electrical conductivity for absorption-dominant EMI *** increasing Ag NW coverage leads to significantly increased electrical conductivity without increasing the EM wave reflection as well as the density and thickness of the film,yielding excellent specific EMI shielding effectiveness(>8500 dB/(g·cm^(2))),low driving voltage for energy-efficient electrothermal heating(163℃at 2.5 V),and fast response time(60 s)at a low areal density of 0.015 mg/cm^(2).Combining EMI shielding and electrothermal heating,the heterogeneous film developed here are promising contenders for the protection of electronic equipment in low-temperature environment.

关键词： heterogenous composite film MXene electromagnetic interference(EMI)shielding thermal management

Unveiling the Contribution of Lactic Acid to the Passivation Behavior of Ti-6Al-4V Fabricated by Laser Powder Bed Fusion in Hank’s Solution

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 102-118页

作者： yu-Hang Chu Liang-yu Chen Bo-yuan qin Wenbin Gao Fanmin Shang Hong-yu Yang Lina zhang Peng qin Lai-Chang zhang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212100China Foshan(Southern China)Institute for New Materials Foshan528200China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

In actual physiological environments,bacteria can activate the immune system and release lactic ***,the detailed contribution of lactic acid to the passivation behavior of titanium(Ti)alloys is still *** current work investigated the in vitro passivation behavior of Ti-6Al-4V(TC4)alloys fabricated by laser powder bed fusion in Hank's solution with and without adding lactic *** methods,inductively coupled plasma atomic emission spectrometer,and X-ray photoelectron spectroscopy were jointly *** lactic acid decreases the corrosion resistance of samples by degrading the formed passive *** film formed in the(lactic acid)-containing solution exhibits a higher level of oxygen vacancies and a lower thickness,attributed to the suppressed formation of Ti^(4+)transformed from Ti^(3+)and Ti^(2+).Moreover,the presence of lactic acid would increase the open circuit potential,relieve the ions release,and hinder the deposition of calcium phosphates within 24 h immersion.

关键词： Titanium alloy Corrosion behavior Passive film Lactic acid Laser powder bed fusion

基于患者身材的影像采集参数优化与冠状动脉造影低剂量化的相关性分析

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中国介入心脏病学杂志 2024年第4期32卷 191-196页

作者：钱海张玉琴楼钶楠胡德兴宁波市医疗中心李惠利医院心内科浙江宁波315040 宁波市医疗中心李惠利医院影像科浙江宁波315040

目的探讨影像采集参数优化与冠状动脉造影辐射剂量和影像质量的相关性。方法选择2022年1月至2024月1月于宁波市医疗中心李惠利医院择期行经皮冠状动脉造影患者60例,采集患者的基本信息和身材数据,根据身体质量指数(BMI)值分为3个组,各BM... 详细信息

目的探讨影像采集参数优化与冠状动脉造影辐射剂量和影像质量的相关性。方法选择2022年1月至2024月1月于宁波市医疗中心李惠利医院择期行经皮冠状动脉造影患者60例,采集患者的基本信息和身材数据,根据身体质量指数(BMI)值分为3个组,各BMI组患者随机分入常规模式组(冠状动脉模式采集影像:Cardiac Left Coronary,15帧/秒)和优化模式组(电生理模式采集影像:Cardiac EP,7.5帧/秒),收集辐射剂量数据,并根据影像质量评分表评估影像质量。两组间比较采用独立样本t检验、Mann-Whitney U检验,多组间比较采用单因素方差分析,相关性采用Pearson相关分析。结果患者BMI值越高,胸围越大,辐射剂量越高,呈正线性相关;各BMI组内,优化模式组的各项辐射剂量数据(各类型剂量面积乘积、空气比释动能及胸部皮肤剂量)均低于常规模式组(均P0.05),均符合手术要求。结论经皮冠状动脉造影的辐射剂量受患者身材、影像采集参数、曝光时长等诸多因素的综合影响,通过优化影像采集参数可在保证影像质量的同时实现辐射低剂量化,减少患者和术者的辐射危害。

关键词：冠状动脉造影影像采集低剂量影像质量

Serum Beta-hCG of 11 Days after Embryo Transfer to Predict Pregnancy Outcome

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Journal of Reproduction and Contraception 2007年第3期18卷 213-219页

作者： Xiao-yan HUANG yun-na zhang Hai-qin yu Department of Obstetrics ＆ Gynecology Ruijin Hospital School of Medicine Shanghai Jiao Tong UniversityShanghai 200025 China

Objective To assess the clinic value of a single maternal serum beta-human chorionic gonadotropin （β-hCG） assay 11 d after embryo transfer in ART pregnancies and to predict pregnancy outcome. Methods A total of 384 pregnancies after embryo transfer were included. Inviable pregnancies were defined as biochemical pregnancies, ectopic pregnancies and first trimester abortions. Ongoing pregnancies were defined as singleton pregnancies and multiple pregnancies whose gestation were achieved more than 12 weeks. Serum β- hCG concentrations were compared among different groups. Results On the post embryo transfer d 11, the mean β-hCG concentration of the ongoing pregnancy group （323. 7±285.2 mIU/ml） was significantly higher than that of the inviable pregnancy group （81.4±68.1 mmIU /ml）（P〈 0. 001）. In multiple gestations, the levels of β-hCG were significantly higher compared with singleton pregnancies. If the β-hCG level was between 10 mIU/ml and 50 mIU/ml, the positive predictive value of biochemical pregnancies and ectopic pregnancies was 81.8%, the negative predictive value was 94.4%. If the level was less than 100 mIU/ml, the positive predictive value of first trimester abortions was 80.8%, the negative predictive value was 77.8%. If the level was greater than 250 mIU/ml, the positive predictive value of multiple pregnancies was 83.3%, the negative predictive value was 74.4%. Conclusions A single serum β-hCG level on d 11 after embryo transfer has good predictive value for clinical pregnancy outcome in controlled ovarian stimulation cycles and helps to plan the subsequent follow-up.

关键词： beta-human chorionic gonadotropin (β-hCG) pregnancy outcome embryo transfer