共查询到20条相似文献，搜索用时 156 毫秒
1.
In this paper, a plug-in hybrid electrical vehicle (PHEV) is taken as the research object, and its dynamic performance and economic performance are taken as the research goals. Battery charge-sustaining (CS) period is divided into power mode and economy mode. Energy management strategy designing methods of power mode and economy mode are proposed. Maximum velocity, acceleration performance and fuel consumption are simulated during the CS period in the AVL CRUISE simulation environment. The simulation results indicate that the maximum velocity and acceleration time of the power mode are better than those in the economy mode. Fuel consumption of the economy mode is better than that in the power mode. Fuel consumption of PHEV during the CS period is further improved by using the methods proposed in this paper, and this is meaningful for research and development of PHEV. 相似文献
2.
Knitted fabric is very different from woven fabric due to its more complicated knitting structures. The buckling of knitted fabric sheets subjected to simple shear in the wale direction is investigated analytically in consideration of the large deformation of fabric sheet in critical configuration. The theory on instability of finite deformation is applied to the analysis. All the stress boundary conditions of knitted fabric sheet are satisfied. An equation to determine the buckling direction angle is derived. It is shown that there are two possible buckling modes, flexural mode and barreling mode. The buckling condition equations for the flexural mode and barreling mode are also obtained respectively. Numerical illustrations reveal that only the flexural mode can actually occur and the barreling mode cannot, which agrees with the experimental observations. For a permitted buckling mode on margin boundaries, the critical value of shear amount and the buckling direction angle can be determined. 相似文献
3.
This paper discusses the collapse mode of thin reinforced concrete (RC) plates sub-jected to blast load. To extend the well known plastic-mode method to analyze, not only perfect-plastic plates , but also RC plates, it is needed to investigate the effect of material cracking on the collapse mode because the plate might have been cracked on both upper and lower surface before the plastic-mode fully develops, creating an unexpected type of collapse mode shape. A new fail-ure mode is proposed and verified by numerical analysis in this paper. The new mode is a result of the material cracking and has an un-negligible effect on the reaction mechanism of the RC plate to the blast load. 相似文献
4.
郑玲 《重庆大学学报(英文版)》2003,2(1)
~~under the sliding mode controller. It shows that the sliding mode controller yield almost perfect tracking to the reference model. It can be seen in Fig.6 that the acceleration of sprung mass under sliding mode controller is controlled within ?.7 m/s2. Fig.7 shows the robustness and stability of the sliding mode controller to the parameter variations of the system to be controlled, in this case, a relative decrease of 10 % in the sprung mass and a relative increase of 15 % in the stiffness o… 相似文献
5.
A novel fiber strain sensor is proposed, based on the two-mode interference of a suspended-core fiber. A fullvectorial finite difference mode solver is employed as the numerical tool for characterizing the proposed strain sensor. The numerical results show that the proposed strain sensor has an estimated sensitivity of 0.05 rad/(m·με), higher than that of the strain sensors using conventional multimode fibers, while the temperature sensitivity of the proposed sensor is relatively low. 相似文献
6.
Research progress on Fabry-Perot resonator antenna 总被引：1，自引：0，他引：1
The Fabry-Perot resonator （FPR） antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap （EBG） defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed. 相似文献
7.
This is the first one of the series papers,fo-cusing on the typology study of distance educationforms and its major achievements.Itprovides briefcomments on those influencing typologies:indus-trialization theory and Fordist conceptual frame-work of distance education,the Eastmode and theWest mode of distance education,single mode anddual mode of distance teaching institutions,large-scale system and small- scale system of distance ed-ucation,three generations of information technolo-gy and dist… 相似文献
8.
Qijia Zhou 《美中教育评论》2006,3(3):57-63
In this essay the author attempts to put forward an innovative teaching mode in the course of ＂English Conversation＂ for sophomore English majors in China. In this mode an authentic conversation is used as the teaching material and the theoretic aspects of Conversation Analysis （CA） are applied for the teaching of the course. This mode can be carried out by English teachers as a teaching experiment and then the teaching effects can be measured through comparison with the traditional teaching mode in which no authentic teaching materials are used. 相似文献
9.
British famous authoress Charlotte Bronte,known for her masterpiece Jane Eyre,is liked by masses of readers.Its most unforgettable point is the classic image in the world literature gallery-Jane Eyre.It’s the beauty that makes Jane unforgettable.Then where does the beauty lie and how does the authoress pass the signal of such beauty via the character-what aesthetic mode does the authoress employ? Why should such mode be? Through reading the text repeatedly,I think the novel Jane Eyre implies one unique aesthetic mode,namely the mode of"Antithetical Aesthetics",and creates the beauty image with the help of it.With such understanding,in this essay I attempt to explore Jane Eyre and its aesthetic value. 相似文献
10.
The characteristics of Internet English teaching happens to conform to the principles of constructivism.So a new teaching mode comes into being.Here Teachers’ roles in the new mode is to be discussed,which is advanced combined with experence and theoretical analysis. 相似文献
11.
12.
高险峰 《福建工程学院学报》2021,(4):342-348
通过对比试验研究了直流、交流方波波形参数(频率、平衡和电压偏移)对埋弧焊焊接效率的影响。结果表明,熔深随着频率的增大而减小,随着平衡和电压偏移的增大而增大?熔敷效率随着平衡和电压偏移的增大而减小。进一步试验证明:直流、交流并用有利于提高焊接生产效率。该研究成果为实际工业应用中埋弧焊成形质量提供了理论依据。 相似文献
13.
采用废弃花生壳对Cr（Ⅵ）浓度为50mg/L的模拟水样进行了静态吸附实验研究。实验结果表明,对于Cr（Ⅵ）浓度为50mg/L的50mL模拟水样,在25℃下,用粒径为2-3mm花生壳吸附剂用量为1.0g、介质pH值为1.0、吸附时间为300min处理废水时,Cr（Ⅵ）的去除率可以达到99.55%。吸附后的水中Cr（Ⅵ）浓度为0.224mg/L,满足《污水综合排放标准》GB8978-1996的标准。随着体系温度的升高,花生壳对Cr（Ⅵ）的吸附量增加,同时对吸附等温线及其模型的拟合进行了实验说明,Freundlich模型能较好地反映吸附过程特征。 相似文献
14.
An exhaust heat recovery generator is proposed to be integrated with conventional gas-fired triple-effect LiBr/water absorption cooling cycles to improve system energy efficiency. As a case study, simulation of the novel cycle based on promising parallel flow with cooling capacity of 1 150 kW is carried out under various heat recovery generator vapor production ratios ranging from 0 to 3.5%. The life cycle saving economic analysis, for which the an- nual gas conservation is estimated with Bin method, is employed to prove the worthiness of extra expenditure. Results show that the optimum gas saving revenue is obtained at 2.8% heat recovery generator vapor production ratio with 42 kW exhaust heat recovered, and the system energy efficiency is improved from 1.78 to 1.83. The initial investment of exchanger can be paid back within 7 years and 9 000 CNY of gas saving revenue will be achieved over the 15-year life cycle of the machine. This technology can be easily implemented and present desirable economic effects, which is feasible to the development of triple-effect absorption cycles. 相似文献
15.
纳米材料与常规常规材料相比呈现出吸收峰红移、蓝移等特异性能;初步研究表明,纳米颗粒尺寸越小,这些特异效应越明显,有关纳米材料光谱特性的研究已成为当前纳米材料研究的热点之一;然而,其光谱特性机理尚无统一解释;通过对波谱吸收机理和纳米材料特性的综合考察和分析,以及结合具体纳米材料的讨论,给出了导致蓝移、红移的主要因素。 相似文献
16.
Schiff碱型大环化合物改性壳聚糖的研究 总被引：3，自引：0，他引：3
居红芳 《常熟理工学院学报》2005,19(2):58-62
通过一系列的反应先合成Schiff碱型大环化合物,然后以Schiff碱型大环化合物改性壳聚糖,合成得到的该种壳聚糖衍生物具有特殊结构与性能,这一活性产物对重金属如Pb^2 具有良好的吸附与富集性能,与其他壳聚糖衍生物的吸附性能相比,该种Schiff碱型大环化合物改性的壳聚糖更加优越,吸附性能更好。 相似文献
17.
AB—8树脂吸附和分离桑葚红色素的新工艺 总被引：5，自引：0，他引：5
研究了用树脂吸附和分离桑葚红色素，比较了五种树脂对桑葚红色素的吸附。结果表明，选用AB—8树脂作吸附剂，在pH＝2的酸水溶液中吸附，并用80％的乙醇洗脱，产品与传统法比较其色价高。同时AB—8树脂非常稳定，使用18次后其吸附率仅降低2．3％。 相似文献
18.
中药中活性物质单克隆抗体的制备及其免疫检测应用 总被引：2，自引：0，他引：2
中药活性成分检测是中药质量控制的关键环节,但中药中许多重要活性物质如甾体皂苷、多数三萜皂苷和大多数真菌中的多糖化合物光谱吸收只有弱的末端吸收甚至无特征紫外吸收,分析、检测比较困难.在单克隆抗体技术基础上的小分子化合物的免疫学检测可应用于这些活性成分化合物的快速检测以及研究其在体内的代谢和分布.该方法与传统检测方法相比,省时、便携、易操作,将在中药材标准研究上发挥更大的作用. 相似文献
19.
采用直流脉冲磁控溅射方法在非晶硅薄膜上制备AZO背反电极,比较不同制备参数对透过率及效率的影响。采用优化参数,得到效率增加了0．8％的非晶硅薄膜电池。根据实验结果,证明背反电极增反机理不是薄膜干涉增强原理,而是因为界面共振吸收减少,而导致光的吸收增强的机理。 相似文献
20.
侯占忠 《河北北方学院学报(社会科学版)》2003,19(6):65-71
根据SO42-与Ba2+反应生成BaSO4沉淀,用原子吸收法测定溶液中剩余的Ba2+,进而间接求出水中的SO42-含量.在5ml水样中加入1.75mlBa2+(1mg/ml),经一定时间的陈化后,用原子吸收法测定水样中的Ba2+,利用先作好的标准曲线,得到水样中的SO42-的量.用于不同类型的水样分析,对于河水中的硫酸根的测定标准偏差为0.0012,相对标准偏差为2.87％. 相似文献