燃料电池重卡工况运行燃料经济性仿真计算分析及评估

氢燃料电池汽车具有零排放、无污染、高效节能、噪声低等优点。氢气消耗量是燃料电池汽车重要的经济性评估指标。本文采用由雄川氢能科技（广州）有限公司、南京金龙客车制造有限公司、新源动力股份有限公司共同开发完成的31吨燃料电池重卡实车数据,基于国家重型车C-WTVC测试标准工况,结合仿真软件建立了燃料电池重卡整车动态仿真模型,计算了整车在循环工况下的氢气消耗量,并且和同类型的柴油重卡的柴油经济性进行了基于仿真计算的对标,结果表明：按照目前到站的氢气价格来看,传统柴油重卡占据优势,根据本文的仿真计算结果评估当氢气价格下降到29元/公斤时该款燃料电池重卡的运行成本和同类型的柴油重卡持平。本文提出的工况仿真计算可以作为简单快速评价燃料电池汽车经济性的一种方法。     

我国出口集装箱班轮运价周期性分析

为探究我国出口集装箱班轮运价的周期性,提高对集装箱班轮运输行业周期性的认识,以中国出口集装箱运价指数（CCFI）作为我国出口集装箱班轮运价的测度指标,分析其周期性,发现1个循环周期大约4年,与世界经济周期有较大相关性,随贸易额的涨跌而变动,季节周期表现为夏秋高、冬春低的特点,运价从3—4月的最低点上升到9—10月的最高点,此后逐渐下降,每年1个周期。     

Construction of Pure Mendelsohn Triple Systems

This paper determined the existence of λ-fold pure Mendelsohn triple system of order υ satisfying λυ(υ-1)≡0 (mod 3) and υ≥4λ 5, or υ=2λ 2, and in the case of λ=4,5,6, which completely settled their existence.     

Existence of Almost Resolvable Directed 7-Cycle Systems

Let ARDkCS（v） denote an almost resolvable directed k-cycle system of order v. It is clear that a necessary condition for the existence of an ARDkCS（v） is v=1（mod k）. For k：3,4,5 and 6, the existence of an ARDkCS （v） had been completely solved. This paper shows that there exists an ARD7CS（v） if and only if v≡1 （rood 7） and v≥8.     

阴离子交换树脂再生液循环的实验研究

通过对NaOH-H2O-C2H5OH-Na2SO4(NaCl)体系相平衡规律的研究,提出了循环利用阴离子交换树脂再生溶液的方法,该方法利用乙醇调整再生液体系的相平衡,分离出再生产物,实现再生液循环使用,防止了水体污染和资源浪费。     

超循环理论在交通影响分析阀值研究中的应用

超循环理论是M·艾根等创建的一个较为完整的自组织理论,该理论运用反应循环、催化循环、催化超循环三个循环,系统诠释了生物进化无机物到生命细胞的形成过程。在系统分析思想的指导下,文中将超循环理论应用到交通影响分析阀值的研究中,提出了一种研究阀值的新方法——超循环理论法。该方法运用系统动力学及不动点理论建立模型,通过对模型的求解,确定最终阀值。该方法的运用,简化了阀值研究程序,节省了阀值分析时间,具有较强的操作性。     

Experimental study on the effect of cyclic preloading on the resistance to liquefaction of saturated loose sand under wave loading

By using the soil static and dynamic universal triaxial and torsional shear apparatus, a series of combined cyclic shear tests are performed to simulate the rotation in the principal stress direction induced by ocean wave. The tests include the cyclic preloading tests and liquefaction tests in the second loading on saturated loose sand with a relative density of 30%. The all tests are consolidated under isotropic condition. The effect of the cyclic preloading on the resistance to liquefaction of saturated loose sands under the condition of continuous rotation in the principal stress direction is investigated. Experimental data indicate that the void ratio of saturated sands has a negligible reduction after cyclic preloading. With the increase of the intensity of cyclic preloading (in the amplitude and in the number of cycles), the resistance to liquefaction in the second loading is increased continuously under the condition that the liquefaction does not occur during the cyclic preloading. The reason is that the construction of more stable structure due to the uniformity of the void and the better interlocking of the particles when the cyclic preloading is applied to the saturated sand.     

Cyclostationary property based spectrum sensing algorithms for primary detection in cognitive radio systems

To implement the primary signal without interference in cognitive radio systems, cognitive radios can detect the presence of the primary user in low SNR. Currently, energy detector is the most common way of spectrum sensing because of its low computational complexity. However, performance of the method will be possibly degraded due to the uncertainty noise. This paper illustrates the benefits of one-order and two-order cyclostationary properties of primary user’s signals in time domain. These feature detection techniques in time domain possess the advantages of simple structure and low computational complexity comparing with spectral feature detection methods. Furthermore, performance of the one-order and two-order feature detection is studied and the analytical results are given. Our analysis and numerical results show that the sensing performance of the one-order feature detection is improved significantly comparing with conventional energy detector since it is robust to noise. Meanwhile, numerical results show that the two-order feature detection technique is better than the one-order feature detection. However, this benefit comes at the cost of hardware burdens and power consumption due to the additional multiplying algorithm.     

电喷LPG发动机快速燃烧过程循环变动的研究

研究了某电喷LPG发动机快速燃烧过程的循环变动.结果表明,基于高能双火花塞点火模式的快速燃烧系统的燃烧压力峰值以及对应的相位波动范围小于高能单点火模式;强涡流使发动机压力峰值相位产生较大波动.在稀燃模式下,高能双点火模式与普通单点火模式相比.不但稀燃极限得到了扩展,燃烧压力峰值的循环变动范围非常小,其对应的相位波动范围也较小.     

王马独家据有的国家发明专科产品

蓄电池是电动车的能源载体,是影响电动车性能的关键部件：随着电动自行车的普及和电动汽车的发展,对蓄电池的放电时间、电池容量、稳定性等提出了越来越高的要求。面对市场上纷繁复杂的电动车蓄电池良莠不齐的局面以及多种胶体电池的存在,黄山市王马电源（集闭）有限公司经过十几年的潜心研发的纳米胶体动力型蓄电池以其循环寿命比传统铅酸电池,循环寿命提高200次和良好的低温性能正式通过国家知识产权局审查并授予国家发明专利证书（专利号：ZL2006 10096700．0）。