侧风干扰下汽车稳定性控制研究

文章针对高速行驶的汽车在侧风干扰下易发生横摆失稳与驶离预定路径的问题,建立了考虑侧风作用的整车八自由度动力学模型,并利用相平面法,识别侧风环境中汽车所处的状态,设计了主动前轮转向(AFS)与直接横摆力矩(DYC)协调控制器,对侧风环境中汽车行驶进行稳定性控制。在侧风干扰工况下,对控制算法进行仿真验证,结果表明:具有AFS与DYC协调控制器车辆的侧向位移小于无控制及单一控制器的车辆,横摆角速度、质心侧偏角和侧向加速度均得到明显改善,提高了车辆在侧风环境中行驶的安全性和稳定性。

Runoff Characteristics of Different Stands in Dongjiang Lake Reservoir Area

Different forest stands in the Dongjiang Lake Reservoir area of Zixing were selected as the research objects to study the characteristics of runoff generation in different forest stands.The results showed that there was no significant difference in annual runoff among M3,M1,and M5,and no significant difference between each forest stand and the control.The order was M3(22.75 mm)>M1(21.77 mm)>M5(20.14 mm).Forest vegetation generates less runoff through vegetation restoration compared to the control,indicating that forest vegetation reconstruction and restoration are beneficial for soil and water conservation.

Clinical andTransmission Characteristics of COVID-19-A Retrospective Study of 25 Cases from a Single Thoracic Surgery Department

The outbreak of corona virus disease 2019(COVID-19)imposes a major challenge in managing patients undergoing surgical operation.In this study,we analyzed clinical and transmission features of 25 cases of COVID-19 from a single thoracic department,including 13 patients and 12 health care staff.There were 13 males and 12 females.The median age of the patients was 61(range:51 to 69)years.The median age of the health care staff was 35(range:22 to 51)years.By the end of follow-up date(Mar.3,2020),there were 16 non-severe cases(64%)and 9 severe cases(36%),5 cases were dead(20%).Nineteen(76%)of the infected cases were confirmed by SARS-CoV-2 nucleic acid test,the rest were clinically diagnosed as suspected COVID-19 cases,and 19(76%)of the infected cases had positive exposure history.We found that COPD was significantly associated with severity and death(P-0.040,and P=0.038,respectively),and chest operation was significantly associated with death for COVID-19 patients(P-0.039).A potential“super spreader"may be the source of the transmission before the implementation of quarantine and comprehensive protcction.It was concluded that COVID-19 is associated with poor prognosis for patients undergoing thoracic operation,especially for those with COPD.Implementation of comprehensive protective measures is important to control nosocomial infection.

Middle lobe torsion after right upper and lower lobectomy:repositioning of lobar torsion using a3-cm uniportal video-assisted thoracoscopic surgery

We aimed to describe a method for repositioning of right middle lobar torsion by using a 3-cm uniportal video-assisted thoracoscopic surgery(VATS) approach. Middle lobe torsion occurred after right upper and lower lobectomy in a 74-year-old man. Immediate re-exploratory thoracotomy using the 3-cm uniportal VATS approach was performed. The torsion was corrected, and the lobe was anchored to the anterior chest wall with Prolene stitches. The patient recovered well postoperatively with daily improvements in chest radiographic findings. Follow-up examination was performed using fiberbronchoscopy, which revealed an unobstructed right middle lobe bronchus and sticky yellow sputum. Follow-up chest computed tomography was performed 3 months after the primary surgery and revealed increased expansion of the right middle lobe. We repositioned the right middle lobe successfully by using the 3-cm uniportal VATS approach, but more cases are needed to confirm the feasibility of the approach. Lobectomy remains the primary treatment option for such cases.

Isomerization of Hydrofluorocyclopentenes Promoted by Fluoride Anion

The isomerization of hydrofluorocyclopentenes promoted by fluoride anion was investigated. It was found that two processes were responsible for interconversion of the isomers: an allylic syn-addition/elimination of fluoride anion that does not change the mutual positions of hydrogen atoms but is responsible for transfers of fluorine atoms, and a fluoride anion-assisted deprotonation/protonation which does not change the mutual positions of fluorine atoms but is responsible for transfers of hydrogen atoms. In the deprotonation, HF can easily capture excess fluoride anion to form HF2- anion which can probably inhibit the protonation.

A novel technique to insert nasogastric tube for the anesthetized patients during cervical esophageal reconstruction

We are describing a novel technique to insert nasogastric tube （NGT） in the anesthetized patients dur- ing cervical esophageal reconstruction. Methods： Forty patients with mid and upper esophageal tumor enrolled into this study were randomly allocated into two groups （the control group, group C and the novel method group, group N）. All the patients were applied mechanical anastomosis to finish the cervical esophageal reconstruction. The procedure of NGT insertion for group C use the conventional method; well, the group N use the novel technique. Results： All the patients in group N had been finished the NGT insertion in the first attempt, and the total time for insertion was （5.05 ＋ 1.15） mins; on the contrary, for the group C, duration of insertion （min） was （24.45 ± 5.23） mins, and the successful rate of NGT insertion in the first attempt was 40% （P〈 0.05）; no one in group N had coiling/kinking, and 6/20 （30%） in group C had it （P= 0.020）. The complication rate of bleeding between the two group had no significant difference. Conclusion： For the patient with mid and upper esophageal tumor who need cervical esophageal reconstruction, this novel method can save the NGT insertion time, and make it easier with higher successful rate.

A Literature Review of Stochastic Programming and Unit Commitment

The study of unit commitment (UC) aims to find reasonable schedules for generators to optimize power systems’ operation. Many papers have been published that solve UC through different methods. Articles that systematically summarize UC problems’ progress in order to update researchers interested in this field are needed. Because of its promising performance, stochastic programming (SP) has become increasingly researched. Most papers, however, present SP’s UC solving approaches differently, which masks their relationships and makes it hard for new researchers to quickly obtain a general idea. Therefore, this paper tries to give a structured bibliographic survey of SP’s applications in UC problems.

Ni/PMN-PT多铁异质结中电场对磁性的调制

采用脉冲激光沉积法制备Ni/PMN-PT复合磁电薄膜。对样品的结构、磁性和磁电效应测量表明,样品表现出明显的电场调制磁性效应,而且这种调制具有非易失性和良好的温度稳定性,因此在信息存储、传感器等领域有潜在应用前景。此外,论文还分析了电场调制机制,即通过在PMN-PT单晶里电场诱导铁电极化产生应力,进而通过磁弹效应对Ni薄膜晶格结构及磁相互作用的产生影响,从而获得此结构中电场对Ni薄膜磁特性的有效调制。

川西高山峡谷地区震后滑坡演化趋势研究

汶川地震引发的同震滑坡给川西高山峡谷地区人民带来了巨大威胁。震后在强降雨的影响下,新生滑坡及古滑坡活动加剧,分析震后滑坡的演化趋势,对重点地区及时开展监测预警显得尤为重要。以汶川县东北部为研究区,基于GIS平台选取岩性、距断层距离、PGA、高程、坡度、坡向、剖面曲率、地形起伏度、年最大24 h降雨等9个影响因子,利用滑坡频率密度、面积密度和数量密度,统计分析2009年、2011年、2015年、2021年4期滑坡时空演化特征;同时结合证据权重(WOE)、随机森林(RF)、证据权重-随机森林(WOE-RF)模型,开展研究区滑坡易发性演化趋势分析。结果表明:随时间推移,滑坡数量、面积和规模均大幅减小,已处于较低水平;滑坡时空演化以2015年为转折由南向北发展;经ROC验证,WOE-RF得到的滑坡易发性精度最高,且三种模型均显示滑坡极高易发区演化也呈远离震中的由南向北之势。研究结果为川西高山峡谷地区滑坡灾害早期识别与监测预警提供理论依据。

新能源汽车专业双创人才培养模式探析

为适应新经济、新产业的发展,培养工程实践能力强、创新能力强和国际竞争力强的双创人才迫在眉睫。随着新能源汽车行业的快速发展,对于传统的汽车类专业人才培养模式已经不能满足市场需求。本文首先在新能源汽车产业发展环境下对汽车专业双创人才的需求现状进行分析,其次简单分析了新能源汽车专业人才培养现状,最后在智能制造大背景下提出一些新能源汽车专业双创人才培育模式改革上的建议。

Effect of Al content on the reaction between Fe-10Mn-xAl(x=0.035wt%,0.5wt%,1wt%,and 2wt%)steel and CaO-SiO_(2)-Al_(2)O_(3)-MgO slag

The effect of Al content(0.035 wt%,0.5 wt%,1 wt%,and 2 wt%)on the composition change of steel and slag as well as inclusion transformation of high manganese steel after it has equilibrated with Ca O-Si O_(2)-Al_(2)O_(3)-Mg O slag was studied using the method of slag/steel reaction.The experimental results showed that as the initial content of Al increased from 0.035 wt%to 2 wt%,Al gradually replaced Mn to react with Si O_(2)in slag to avoid the loss of Mn due to the reaction;this process caused both Al_(2)O_(3)in slag and Si in steel to increase while Si O_(2)and Mn O in slag to reduce.In addition,the type of inclusions also evolved as the initial Al content increased.The evolution route of inclusions was Mn O→Mn O-Al_(2)O_(3)-Mg O→Mg O→Mn O-Ca O-Al_(2)O_(3)-Mg O and Mn O-Ca O-Mg O.The shape of inclusions evolved from spherical to irregular,became faceted,and finally transformed to spherical.The average size of inclusions presented a trend that was increasing first and then decreasing.The transformation mechanism of inclusions was explored.As the initial content of Al increased,Mg and Ca were reduced from top slag into molten steel in sequence,which consequently caused the transformation of inclusions.

中药炮天雄质量标准提升与完善研究

目的:提升和完善中药炮天雄的质量标准。方法:采用经验鉴别对炮天雄性状进行描述;增加显微鉴别观察炮天雄粉末显微特征;采用薄层色谱法,分别以苯甲酰新乌头原碱、苯甲酰次乌头碱、次乌头碱进行定性鉴别;检查项包括水分、总灰分和酸不溶性灰分;增加了浸出物项;含量测定采用高效液相色谱法,HPLC条件为以乙腈为流动相A,以0.4mol/L醋酸铵溶液(调pH=8±0.1)为流动相B,进行梯度洗脱(0~45min,30%~45%A),检测波长为235nm,柱温为25℃,流速为0.8mL/min。结果:炮天雄性状、粉末显微鉴别、薄层鉴别方法具有较好的专属性,水分含量为7.95%~13.67%,总灰分含量为0.81%~1.13%,酸不溶性灰分含量为0.012%~0.270%,水溶性浸出物含量为15.71%~64.14%,醇溶性浸出物含量为5.31%~24.58%。含量测定中苯甲酰新乌头原碱含量为0.008 8%~0.039 1%,苯甲酰乌头原碱含量为0.0001%~0.0018%,苯甲酰次乌头原碱含量为0.0011%~0.0068%,新乌头碱含量为0~0.0026%,次乌头碱含量为0~0.0053%,乌头碱含量为0~0.0075%。结论:本实验制定的炮天雄定性定量检测方法可靠,结果准确科学,确定了苯甲酰新乌头原碱、单酯型生物碱和双酯型生物碱含量限度,进一步完善了炮天雄质量标准。

Sedimentary characteristics and processes of the Paleogene Dainan Formation in the Gaoyou Depression, North Jiangsu Basin, eastern China

In this paper,the type,vertical evolution,and distribution pattern of sedimentary facies of the Paleogene Dainan Formation in the Gaoyou Depression of the North Jiangsu Basin are studied in detail.Results show that fan delta,delta,nearshore subaqueous fan,and lacustrine facies developed during the Dainan Formation period and their distribution pattern was mainly controlled by tectonics and paleogeography.The fan delta and nearshore subaqueous fan facies predominantly occur in the southern steep slope region where fault-induced subsidence is thought to have created substantial accommodation,whereas the delta facies are distributed on the northern gentle slope which is thought to have experienced less subsidence.Finally,the lacustrine facies is shown to have developed in the center of the depression,as well as on the flanks of the fan delta,delta,and nearshore subaqueous fan facies.Vertically,the Dainan Formation represents an integrated transgressiveregressive cycle,with the E2d1being the transgressive sequence and the E2d2being the regressive sequence.This distribution model of sedimentary facies plays an important role in predicting favorable reservoir belts for the Dainan Formation in the Gaoyou Depression and similar areas.In the Gaoyou Depression,sandstones of the subaqueous distributary channels in the fan delta and the subaqueous branch channels in the delta are characterized by physical properties favorable for reservoir formation.

基于FID的高温型总烃在线分析仪的研制

基于氢火焰离子化(FID)检测器,研制了高温型总烃在线分析仪。仪器整机尺寸为43cm×40cm×22.5cm,重量为27kg,正常运行功耗约为150W。本文介绍了仪器运行流程及工作原理,并对仪器独特的气体流路以及双层恒温箱结构进行了阐述,最后以甲烷(CH_(4))标准气体为样气,测试了仪器各项性能。实验结果表明:仪器在0~10000μmol·mol^(-1)浓度范围内线性良好,标准曲线相关系数R^(2)大于0.999;示值误差≤2%;最低检出限为0.09μmol·mol^(-1)(CH_(4));重复性相对标准偏差≤1%;响应时间约为3.2s;零点漂移≤±0.5μmol·mol^(-1);量程漂移≤±3%F.S。本仪器操作简单、成本低、稳定性高,能够24h连续自动监测总烃含量,可应用于地区大气环境监测以及石油化工等固定污染源废气的排放监测,具有良好的商用价值和发展前景。

基于生态海绵的景观园路建造研究

以厦门市马銮湾新城集美片区水生态修复区(二期)为示例,基于海绵城市理论阐述了多种类型景观园路的构建形式,重点讨论新型景观园路生态性创建的方法和经验。

La2/3(Ca0.6Ba0.4)MnO3中的磁热效应研究

采用溶胶–凝胶法制备了La2/3(Ca0.6Ba0.4)MnO3 (简写为LCBMO)靶材,并通过及脉冲激光沉积法(PLD)在石英衬底上制备LCBMO薄膜。研究了块体和薄膜结构LCBMO的结构、磁性和磁热效应。实验结果表明,通过PLD方法可以得到纯相结构的LCBMO 薄膜;温度特性测试表明薄膜结构的LCBMO,其居里温度(260.2 K)比块体材料下降30 K;此外,我们得到了LCBMO体系的磁熵变特性。在外磁场2T、居里温度(TC)附近,块体LCBMO的磁熵变(ΔSM)达到最大值2.1 J/kg?K;而LCBMO薄膜的ΔSM也在TC附近达到最大值(8.4 mJ/cm3?K),且在TC附近较宽的温区范围内,ΔSM值均较大,表明这一薄膜体系在宽温区磁制冷工质方面有潜在的应用。

Dynamical analysis for hybrid virus infection system in switching environment

We investigate the dynamical behavior of hybrid virus infection systems with nonlytic immune response in switching environment, which is modeled as a stochastic process of telegraph noise and represented as a multi-state Markov chains. Firstly, The existence of unique positive solution and boundedness of the new hybrid system is proved. Furthermore, the sufficient conditions for extinction and persistence of virus are established. Finally, stochastic simulations are performed to test and demonstrate the conclusions. As a consequence, our work suggests that stochastic switching environment plays a crucial role in the process of virus prevention and treatment.

Eco-friendly concept:female clothing design inspired by plastic bag's pattern

Environment is facing lots of problems mainly caused by plastic bags.Plastic bags have very harmful effect on environment as they don't dispose of.Recycling is a process in which the waste material can be reused and re-created to give it a new look which also saves money and make environment eco-friendly.This study focuses on conveying eco-friendly fashion concept to the consumers.Inspired by plastic bags'shape and patterns,the author creates a new method of pattern making for female clothing which decorated on different materials.Through design practices and draping experiments,a new ready-to-wear collection shows the more possibility of eco-friendly idea in fashion industry.

教育信息化促进乡村教师队伍建设研究——基于西部X省的大规模调研

乡村教师是推动乡村教育高质量发展的关键要素。文章首先梳理教育信息化支持下的乡村教师队伍建设的内涵、困境及国内外相关文献,接着基于西部X省的大规模调研,从信息化教学环境、教师研修与培训以及信息化教学能力三个方面分析教育信息化背景下乡村教师队伍建设现状,在此基础上提出教育信息化促进乡村教师队伍建设的策略建议:筑牢教育信息化基础设施建设,完善乡村学校管理保障机制;开拓乡村教师专业发展路径,优化教师考核与评价体系;提升乡村教师信息化教学能力,强化信息化教学反思。研究结果可为教育信息化促进乡村振兴和教育高质量发展提供有价值的决策和实践参考。

Clinical analysis of thoracoscopic surgery combined with intraoperative autologous blood transfusion in the treatment of traumatic hemothorax

From January 2013 to January 2015, 19 patients of traumatic hemothorax with hemorrhagic shock were treated in our department by thoracoscopic surgery combined with autologous blood transfusion. This study retrospectively analyzed the therapeutic effect and shared our experience. The average amount of blood transfused back was 662.41 ml ± 269.15 ml. None of the patients developed transfusion reaction and were all discharged uneventfully. Thoracoscopic surgery combined with autologous blood transfusion is effective in the rescue of patients with progressive hemothorax and hemorrhagic shock. When corresponding indications are well managed, treatment for these patients is quicker, safer, and more effective.