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A novel downshifting strategy based on medium-time-distance information for hybrid electric bus

Science China(Technological Sciences) 2021年第9期64卷 1927-1939页

作者： cheng Shuo ZHANG Yan YANG YiYong FANG ShengNan li.li.ng WANG XiangYu State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100084China

Vehicle downshifting during braking for the hybrid electric vehicle(HEV) equipped with the automatic mechanical transmission(AMT) could adjust work points of the motor. Thus, downshifting has great potential to effectively improve the efficiency of braking energy recovery. However, the power interruption during shifting could cause some loss of regenerative energy ***, the choice of the downshifting point during vehicle braking which has crucial effect on energy recovery efficiency needs to be intensively studied. Moreover, the real-time appli.ation of the high-efficiency braking energy recovery strategy is a challenging problem to be tackled. Therefore, this paper proposes a dynamic-programming-rule-based(DPRB) downshifting strategy for a specific hybrid electric bus(HEB) driving condition. Firstly, the braking characteristic of the HEB during the process of pulli.g in is analyzed. Secondly, the medium-time-distance(MTD) demonstrating the dimension of time and space is proposed to define the boundary condition of the running bus. Then, look-up tables are establi.hed based on a dynamic programming algorithm offli.e using multiple sets of historical data. Thus, Based on the real-time driving data, whether to enter the optimal gear selection process can be decided onli.e. Finally, simulations and hardware-in-the-loop(HIL) tests are carried out, and the results show that the proposed method can be indeed effective for braking energy recovery.

关键词： regenerative braking medium-time-distance information dynamic programming-rule based hybrid electric bus

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接种方法和接种时期对不同玉米杂交组合穗腐病抗性鉴定的影响

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玉米科学 2024年第3期32卷 107-113页

作者：孟冰王山荭李文学刘甲成汤继华郭子锋河南农业大学农学院/省部共建小麦玉米作物学国家重点实验室郑州450046 中国农业科学院作物科学研究所北京100081

为研究不同接种方法和接种时期对玉米拟轮枝镰孢穗腐病(Fusariumverticilli.ides ear rot,FER)抗性鉴定的影响,选取高抗×高抗、高抗×高感、高感×高感组合各3份,2022年在北京顺义和河南新乡分别用针刺果穗注射法与双牙签法在玉米吐丝... 详细信息

为研究不同接种方法和接种时期对玉米拟轮枝镰孢穗腐病(Fusariumverticilli.ides ear rot,FER)抗性鉴定的影响,选取高抗×高抗、高抗×高感、高感×高感组合各3份,2022年在北京顺义和河南新乡分别用针刺果穗注射法与双牙签法在玉米吐丝后5、10、15d进行接种。结果表明,吐丝后5、10和15d接种,针刺果穗注射法分别比双牙签法的平均病情严重度高6.3%、3.9%和1.8%;吐丝后5d接种,不同组合采用针刺果穗注射法接种未达到显著差异,采用双牙签法达到极显著差异(P<0.01);吐丝后10d和15d接种,不同组合使用针刺果穗注射法均达到极显著(P<0.01)差异,牙签法均未达到显著差异。采用双牙签法接种时,建议吐丝后5d接种;采用针刺果穗注射法接种时,建议吐丝后10~15d接种。

关键词：玉米拟轮枝镰孢穗腐病抗性鉴定接种方法接种时期

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科尔沁沙地土壤碳储量插值计算对比及其影响因素分析

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草业科学 2024年第09期41卷 1979-1990页

作者：张钰清陈银萍程红元王旭洋陈云李玉强兰州交通大学环境与市政工程学院/自然资源部黄河上游战略性矿产资源重点实验室庄浪县乡村振兴事务服务中心中国科学院西北生态环境资源研究院

准确估算土壤碳储量对碳中和的实现与气候变化应对有着重要意义。本研究以地处我国北方半干旱农牧交错带东端的科尔沁沙地为研究区域，基于310个位点0-100 cm深土壤的有机碳数据，用不同插值方法 [反距离权重法（IDW）、普通克里金法（O... 详细信息

准确估算土壤碳储量对碳中和的实现与气候变化应对有着重要意义。本研究以地处我国北方半干旱农牧交错带东端的科尔沁沙地为研究区域，基于310个位点0-100 cm深土壤的有机碳数据，用不同插值方法 [反距离权重法（IDW）、普通克里金法（OK）和回归克里金法（RK）]对土壤有机碳密度（SOCS）进行空间插值并计算区域土壤有机碳储量，使用平均误差（ME）、平均标准化误差（MSE）和均方根误差（RMSE）对插值结果进行评价，结合实测SOCS验证土壤碳储量计算的最优插值方法。结果表明：1)在半干旱沙地SOCS估算中，最终进入回归预测模型的环境变量按影响程度从大到小依次有年积温、降水量、砂土含量和海拔，SOCS与海拔、年积温、降水量和砂土含量存在显著负相关关系；2)不同插值方法计算的区域土壤有机碳储量具有显著差异（P <0.05），基于RK、IDW和OK计算得土壤有机碳储量分别为150.34、158.03和140.11 Tg。与实测值相比，OK低估了土壤有机碳储量，IDW高估了土壤有机碳储量，这种差异凸显了插值方法在区域尺度土壤有机碳储量估算中的重要性；3)基于RK插值的结果最优（ME=0.208,MSE=1.211,RMSE=1.973,R2=0.370 6），相比于OK和IDW的插值精度分别提高了6.0%和22.4%。本研究表明在半干旱沙地RK插值仍然适用并且可以提高插值精度，能更加准确地估算土壤有机碳储量。

关键词：土壤有机碳储量反距离权重法普通克里金法回归克里金法

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Single-particle resonant states with Green’s function method

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Chinese Physics C 2020年第8期44卷 147-154页

作者： cheng Chen Zhipan li.Yuxiao li.Tingting Sun School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Physical Science and Technology Southwest UniversityChongqing 400715China

This study employs the relativistic mean field theory with the Green's function method to study the single-particle resonant *** contrast to our previous work[***.C,90:054321(2014)],the resonant states are identified by searching for the poles of Green's function or the extremes of the density of *** new approach is highly effective for all kinds of resonant states,no matter whether they are broad or *** dependence on the space size for the resonant energies,widths,and the density distributions in the coordinate space has been checked and was found to be very *** ^120Sn as an example,four new broad resonant states 2g7/2,2g9/2,2h11/2,and 1j13/2 were observed,and the accuracy for the width of the very narrow resonant state 1h9/2 was highly improved to 1×10^−8 ***,our results are very close to those obtained using the complex momentum representation method and the complex scali.g method.

关键词： single-particle resonant state Green's function method relativistic-mean-field theory

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Generation of Polycycli. Aromatic Hydrocarbons During Coking

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Journal of Iron and Steel Research International 2010年第12期17卷 6-10页

作者： cheng Xiang-li.li.En-ke CANG Da-qiang SHI Yan li.Mao-jing State Key Laboratory of Advanced Steel Processing and Products Central Iron and Steel Research Institute Beijing 100081 China Tangshan Environmental Protection Bureau Tangshan 063000 Hebei China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China College of Metallurgy and Energy Hebei Polytechnic University Tangshan 063009 Hebei China

The generation of polycycli. aromatic hydrocarbons （PAHs） during coking was studied and the contents of sixteen PAHs were measured by the devices of ultrasonic abstraction and high performance li.uid chromatography for single coal coking and blended coal coking. The results indicated that the amount of generated PAHs during the first 1--4 h of coking is the most. Among these PAHs, the tetranuclear PAHs have a major portion and the Benzo[a]pyrene which can cause cancer, and teratogenesis and mutation is generated for a larger concentration more than emission standard value. Two PAHs are the main pollutants of PAHs pollution.

关键词： polycycli. aromatic hydrocarbon coking single coal blended coal

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Understanding the roles of Ti on the structure and electrochemical performances of li.Ru1-xTixO3 cathode materials for li.ion batteries

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Journal of Energy Chemistry 2019年第6期28卷 9-16页

作者： Hu Zhao Yanchao Shi li.Xue Yingzhi cheng Zhongbo Hu Xiangfeng li. College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Inner Mongoli. Synthetic Chemical Institute Hohhot 010072Inner MongoliaChina School of Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

The lattice doping has been widely used to improve the electrochemical performances of li.rich cathode materials but the roles of the introduced foreign atoms are still not very ***,a series of li.Ru1-xTixO3 soli. solutions have been synthesized and the roles of Ti doping on the structural and electrochemical properties of li.RuO3 have been comprehensively *** Rietveld refinement exhibits that the interlayer spacing gradually shortens with increasing Ti *** shrinkage is favorable to the layered structure stabili.y but increases the li.hium diffusion *** measurements show that li.Ru0.8Ti0.2O3 possesses the best cyclabili.y with 196.9 and 196.1 m Ah g-1for charge and discharge capacity retaining after 90 cycles,*** voltammetry scanning indicates that Ti dopant promotes the formation of more peroxo-or superoxo-li.e species but reduces the initial coulumbic *** of electrochemical impedance spectroscopy display that Ti doping reduces the charge transfer impedance,which facili.ates the li.hium-ion diffusion across the electrolyteelectrode interface and improves the electronic ***2Ru0.8Ti0.2O3exhibits the best electrochemical performance owing to the balance among all the factors discussed *** study also offers some new insights into optimizing the electrochemical performances of li.rich cathode materials through the lattice doping.

关键词： li.hium-ion battery li.rich cathode Ti doping Rietveld refinement

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Association of NOD1 (CARD4) insertion/deletion polymorphism with susceptibili.y to IBD: A meta-analysis

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World Journal of Gastroenterology 2010年第34期16卷 4348-4356页

作者： Lu, Wei-Guo Zou, Yan-Feng Feng, Xiao-li.ng Yuan, Feng-Lai Gu, Yuan-Long li. Xia li. cheng-Wan Jin, cheng li. Jian-Ping Nantong Univ Dept Hepatobiliary Pancreat Ctr Hosp Affiliated 3 Wuxi Jiangsu Prov Peoples R China Nantong Univ Dept Clin Pharmacol Hosp Affiliated 3 Wuxi 214041 Jiangsu Prov Peoples R China Anhui Med Univ Dept Epidemiol & Biostat Sch Publ Hlth Hefei 230032 Anhui Prov Peoples R China

AIM: To find evidences about whether NOD1/CARD4 insertion/deletion polymorphism is associated with inflammatory bowel disease by meta-analysis. METHODS: We surveyed the studies on the association of NOD1/CARD4 insertion/deletion polymorphism with inflammatory bowel disease in PubMed. Meta-analysis was performed for genotypes GG/T vs T/T, GG/GG vs T/T, GG/T + GG/GG vs T/T, GG/GG vs T/T + GG/T, and GG allele vs T allele in a fixed/random effect model. RESULTS: We identified 8 studies (6439 cases and 4798 controls) in Caucasian populations using PubMed search. We found no association between NOD1/CARD4 insertion/deletion polymorphism and inflammatory bowel disease, Crohn's disease, and ulcerative coli.is. Stratification of cases by age showed that NOD1/CARD4 insertion/deletion polymorphism was associated with inflammatory bowel disease in younger age group at onset (< 40 years) (GG vs T: OR = 0.68, 95% CI: 0.50-0.93, P = 0.02; GG/T + GG/GG vs T/T: OR = 0.71, 95% CI: 0.59-0.85, P = 0.0003). CONCLUSION: This meta-analysis demonstrates an association between NOD1/CARD4 insertion/deletion polymorphism and inflammatory bowel disease in the younger age group at onset (< 40 years) in Caucasian populations.

关键词： NOD1 CARD4 Genetic polymorphisms Inflammatory bowel disease Meta-analysis

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松辽盆地西缘构造带构造格架、演化及油气资源潜力

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地质通报 2024年第7期43卷 1073-1089页

作者：汪岩钱程钟辉李成立秦涛杨晓平赵维俊中国地质调查局沈阳地质调查中心辽宁沈阳110034 东北地质科技创新中心辽宁沈阳110034 中国地质调查局军民融合地质调查中心四川成都610036

松辽盆地西缘构造带是研究松辽盆地形成演化的关键地带,但目前关于该构造带的构造格架、活动历史、控盆特征等仍不清晰,构造带深部物质架构及中—新生代构造演化的精细厘定为解决这一科学问题提供了新的证据。松辽盆地西缘地区布格重力... 详细信息

松辽盆地西缘构造带是研究松辽盆地形成演化的关键地带,但目前关于该构造带的构造格架、活动历史、控盆特征等仍不清晰,构造带深部物质架构及中—新生代构造演化的精细厘定为解决这一科学问题提供了新的证据。松辽盆地西缘地区布格重力异常与综合地球物理剖面特征指示,松辽盆地西缘构造带为区域上带状展布的超壳深大构造带。通过对综合构造变形带的产状、性质、运动学等资料分析,提出松辽盆地西缘构造带东西分带、倾向相背的“两带八字形”构造格架。依据构造带发育的基底背景、构造样式、地球物理特征等差异,建立了南北分段的“四段式”展布构架。在此基础上,结合区域构造演化、变形带构造解析与40Ar/39Ar构造年代学等资料,恢复了晚三叠世、中晚侏罗世、早白垩世中期、晚白垩世中期、古新世—渐新世和新近纪—更新世6期中—新生代构造活动年代格架。结合构造带的控盆作用指出,外盆带控制的中侏罗世和早白垩世中期沉积盆地是油气资源勘查的重要选区,为中国东北地区新层系油气资源勘查提供了新依据。

关键词：松辽盆地构造格架年代格架控盆作用油气资源潜力油气勘查工程

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稀有鮈鲫精子超低温冷冻保存

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水生生物学报 2024年第10期48卷 1745-1757页

作者：李鑫叶欢何勇凤余乐程佩琳杜浩吴金明中国水产科学研究院长江水产研究所农业农村部淡水生物多样性保护重点实验室武汉430223 上海海洋大学水产与生命学院上海201306 中国科学院水生生物研究所武汉430072 武汉轻工大学动物科学与营养工程学院武汉430023

为建立稀有鮈鲫(Gobiocypris rarus)精子超低温冷冻保存技术,研究了稀有鮈鲫精子在不同种类和浓度稀释液与抗冻剂、降温程序中的冷冻保存效果,并开展授精实验,以期建立稀有鮈鲫精子超低温冷冻保存方法。首先,比较了5种精子稀释液对稀有... 详细信息

为建立稀有鮈鲫(Gobiocypris rarus)精子超低温冷冻保存技术,研究了稀有鮈鲫精子在不同种类和浓度稀释液与抗冻剂、降温程序中的冷冻保存效果,并开展授精实验,以期建立稀有鮈鲫精子超低温冷冻保存方法。首先,比较了5种精子稀释液对稀有鮈鲫精子活力的影响,发现在BSMIS(Buffered Sperm Motili.y-inhibiting Solution)稀释液中,精子活力最高(95.55±2.35)%,精子曲线运动速度(VCL)、直线运动速度(VSL)和平均路径速度(VAP)分别为(103.00±29.82)、(84.00±26.21)和(126.67±27.57)μm/s,寿命(37.67±0.58)s,与鲜精无显著差异(P>0.05);其次,筛选了不同浓度的6种渗透性抗冻剂,发现当BSMIS稀释液含有10%甲醇时,精子活力最高(22.33±2.08)%;再次,筛选和优化了不同浓度的非渗透性抗冻剂,发现当BSMIS稀释液含有8%甲醇和90 mmol/L葡萄糖时,精子活力最高(46.00±4.00)%,且VCL、VSL和VAP分别为(125.02±7.42)、(107.10±4.92)和(116.99±6.34)μm/s,寿命(32.67±2.52)s,其中VSL、VAP与鲜精相比无显著差异(P>0.05)。最后,比较了4种液氮蒸气中平衡高度和3个液氮蒸气中平衡时间对稀有鮈鲫精子冷冻保存效果的影响,发现液氮蒸气中平衡高度为3 cm且平衡时间为10min时,精子活力显著高于其他实验组。采用流式细胞仪检测冻精质膜完整性、线粒体活性和DNA完整性,分别为(55.78±2.13)%、(56.18±0.64)%和(55.07±2.00)%。进一步通过授精实验评估冻精质量,冻精受精率和孵化率分别为(87.31±1.38)%和(98.84±1.02)%,与鲜精无显著性差异(P>0.05)。上述结果表明,稀有鮈鲫精液以BSMIS稀释液、8%甲醇和90 mmol/L葡萄糖为抗冻保护液,液氮蒸气中3 cm处平衡10min后置于液氮的超低温冷冻保存效果最好。研究初步建立稀有鮈鲫精子超低温冷冻保存技术,为其种质资源的长期保存提供技术支撑。

关键词：精子冷冻保存精子质量流式细胞仪稀有鮈鲫

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A Novel Braking Control Strategy for Hybrid Electric Buses Based on Vehicle Mass and Road Slope Estimation

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Chinese Journal of Mechanical Engineering 2022年第6期35卷 340-350页

作者： Zijun li. Shuo cheng Jinzhao li. Qiong Wu li.ng li.Huawei li.ng State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Beijing Forestry University Beijing 100091China University of Science and Technology Hefei 230026China Institute of Appli.d Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230088China

Proper braking force distribution strategies can improve both stabili.y and economy performance of hybrid electric vehicles,which is prominently proved by many *** achieve better dynamic stable performance and higher energy recovery efficiency,an effective braking control strategy for hybrid electric buses(HEB)based on vehicle mass and road slope estimation is proposed in this ***,the road slope and the vehicle mass are estimated by a hybrid algorithm of extended Kalman filter(EKF)and recursive least square(RLS).Secondly,the total braking torque of HEB is calculated by the sli.ing mode controller(SMC),which uses the information of brake intensity,whole vehicle mass,and road ***,comprehensively considering driver’s braking intention and regulations of the Economic Commission for Europe(ECE),the optimal proportional relationship between regenerative braking and pneumatic braking is ***,related simulations and experiments are carried out on the hardware-in-the-loop test *** show that the proposed strategy can effectively improve the braking performance and increase the recovered energy through precise control of the braking torque.

关键词： Hybrid electric bus Vehicle mass estimation Road slope estimation Braking control strategy Regenerative braking

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