基于Lance距离和信度熵的冲突证据融合方法

针对D-S(Dempster-Shafer)证据理论中证据融合可能存在冲突的问题,通过考虑证据之间的关系及其本身的特性,提出一种基于Lance距离和信度熵的冲突证据融合方法。首先,利用Lance距离来度量证据之间的差异和冲突程度,并通过矩阵形式表示证据的可信度,再通过计算信度熵来度量证据的信息量,并以此表示证据的不确定度。其次,综合考虑证据的可信度和不确定度来衡量证据最终融合的折扣系数,并通过折扣系数修正原始证据。最后,采用Dempster合成规则进行证据融合得到最终结果。算例分析结果表明,所提方法较其他方法而言,收敛速度更快,融合结果更准确、可靠。

LANCEL 绝对巴黎

香榭丽舍大道是位于法国协和广场和凯旋门之间,仅有100米左右的一条林荫大街,法语名字的确切意思是“极乐田园大街”。自1667年由宫廷庭院设计师安德烈·勒诺特雷命人修建成后,直到今日,始终是公认的巴黎中心大街“女王”,云集了银行、保险公司、航空公司和世界顶级时尚品牌专卖店等。LANCEL于2006年重建开张的旗舰店也位列其内。在这灯火辉煌的大街上漫步,就连最挑剔的人也会对香榭丽舍迷人的夜景啧啧赞叹。Lancel自今年起用的全新圆形标志成为了“香榭丽舍经典Cache-Cache”系列设计元素之一,牛皮制成的原型标志相连而成手袋,堪称巧夺天工。是LANCEL百余年魅力的全新演绎,更是这个奢华皮具世家新一季传奇的序章……

Jet Behavior and Metallurgical Performance of Innovated Double-Parameter Oxygen Lance in BOF

A double-parameter oxygen lance used in a 300 t converter was designed to improve the metallurgical performance. A small-scale measurement of the jet behavior was done using a computer controlled scanning system. The experimental data on the velocity distribution at the jet centerline, the contour map of the jet velocity, the deviation of the jet centerline, and the velocity distribution of the axial section were compiled. According to the results of the small-scale measurement, the double-parameter lance was also employed for a BOF experiment. The metallurgy inde- xes show that the metallurgical performance was highly promoted by use of the double-parameter lance.

Simulation of three-phase flow and lance height effect on the cavity shape

A three-dimensional computational fluid dynamics （CFD） model was developed to simulate a 150-t top-blown converter. The ef-fect of different lance heights on the cavity shape was investigated using the volume of fluid （VOF） method. Numerical simulation results can reflect the actual molten bath surface waves impinged by the supersonic oxygen jets. With increasing lance height, the cavity depth de-creases, and the cavity area, varying like a parabola, increases and then decreases. The cavity area maximizes at the lance height of 1.3 m. Under the three different lance heights simulated in this study, all of the largest impact velocities at the molten bath surface are between 50 m/s and 100 m/s.

加权犹豫模糊集的Lance距离测度及其应用

在多属性群决策过程中,犹豫模糊元中不同隶属度所占权重直接影响最终的评价结果。因此,提出一种基于加权犹豫模糊集的Lance距离多属性群决策方法。利用加权犹豫模糊集的熵构造属性信息权重的确定模型,给出加权犹豫模糊集的Lance距离的TOPSIS方法以及生成算法。通过流感疫苗供货商的选择,验证了该方法是可行的和有效的。

Lance Design for Argon Bubbling in Molten Steel

Three lance designs for argon bubbling in molten steel are presented. Bottom bubbling is considered too. Geometries considered are straight-shaped, T-shaped, and disk-shaped. The bubbling behavior of these lances is analyzed using Computational Fluid Dynamics, so transient three dimensional, isothermal, two-phase, numerical simulations were carried out. Using the numerical results, the bubble distribution and the open eye area are analyzed for the considered lance geometries. The plume volume is calculated from the open eye area and the lance immersion depth using geometrical considerations. Among the three lance designs considered, disk-shaped lance has the bigger plume volume and the smaller mixing time. As the injection lance is deeper immersed, the power stirring is increased and the mixing time is decreased.

白兵の情怀 Storm trooper Mitsubishi Lancer EX

当耳边响起“Star Wars Main Title”的交响乐章时,心底的激情就像被按住管口的水管内的水瞬间得以释放。这种感觉,犹如与翼神初见时从双眼直抵内心的触动,抽象得难以用字符去描述与形容这台翼神所带来的力量。但可以明显感受到,车主对它倾注的大量心思与无比的喜爱。这种力量莫不成是原力的另一种形式？如果你有幸能在广州的街道上遇上它,或许你就会有属于你自己的答案了。

杂乱风波

“Todd,早安!”Lance一边走进客厅一边说道。Lance和Todd是室友,他们一起住在城里的一间公寓.“Todd,客厅发生了什么事?到处都是东西。”Lance说。“这些东西吗?哦,我昨天晚上熬夜付账单来着。”Todd说。

Simulation of Flow Field of Oxygen Lance Gas Jet Utilized for 50 t Converter

Based on the operating conditions of oxygen lance utilized for a 50 t converter in Tangsteel,gas jet flow fields of three types of oxygen lances were simulated by FLUENT software.The influence of lance configuration and lance level on penetrating area was studied through cold model experiment.The results showed that the gas flow velocities of four-hole,variable angle four-hole and five-hole oxygen lances declined rapidly with an increase in gas jet length within 1 m,1 m and 0.8 m,respectively.Besides,the multi gas streams sprayed from these three lances should be syncretized at 1.6 m,1.7 m and 1.4 m,respectively.At the highest lance level,the effective penetrating area of these three lances could be 0.255 m2,0.385 m2 and 0.0907 m2,respectively.It was suggested that the effective penetrating area of variable angle four-hole oxygen lance was the biggest,while that of five-hole oxygen lance was the least.The validity of numerical simulation results was proved through cold model experiment.The lance level was suggested to be controlled in the range of 1-1.6 m,1-1.7 m and 0.8-1.4 m for the four-hole,variable angle four-hole and five-hole oxygen lances,respectively.

Failure Mechanism and Material Requirements for Coal Lance in Blast Furnace

Pulverized coal injection（PCI） is a key technology in modern ironmaking by blast furnace（BF） and the life of injection lance has a great influence on PCI operation and on normal running of blast furnace.It is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in BF.The outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis.A mathematical model for calculating the temperature of common monocular coal lance had been developed according to the principles of mass and energy balance.Increasing temperature and flow velocity of the hot blast would cause a rise in the lance temperature.The influence of hot blast temperature is more obvious.The lance temperature would decline when compressed air flux increases.Conveying technology of dense phase pulverized coal is beneficial to extending lance’s life because decreasing solid-gas ratio would intensify erosion and burning loss.The anti-oxidation temperature of lance materials needs to be over 1000 ℃ for BF intensified smelting.In order to increase the resistance to oxidation of the coal lance’s outer surface,oxidation-resistant steel or Al coating stainless steel is the appropriate material for BF use.Employing the metal surface treatment technology to enhance the hardness of the coal lance’s internal surface could prolong the service life of coal lance

Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume

Pulverized coal utilization in the blast furnace is decided by the particle flow and combustion behaviors in the raceway.Under a specific operating condition,these behaviors are directly related to the lance configuration in the upstream tuyere zone.Focusing on single straight lance,six types of single lance configurations were designed by assembling four parameters in different ways.These four parameters are the lance diameter,lance insertion angle,and the horizontal and vertical distances from the lance tip to the tuyere tip.With different lance configuration schemes applied,the pulverized coal combustion process in the lance-blowpipe-tuyere zone was simulated.The simulation results regarding particle diffusion and combustion behaviors were characterized by three indicators from the viewpoint of a coal plume.They are the plume diffusion angle,diffusion uniformity,and the average plume temperature at the tuyere outlet.To promote coal utilization,the values of these indicators under different configurations were analyzed,yielding two optimal configurations.The first one is to reduce the lance length immersed in the blowpipe-tuyere by 100 mm.The other is to increase the horizontal distance from the lance tip to the tuyere outlet by 50 mm,and the insertion angle to 11° with the lance tip located at the tuyere centerline.The findings can enhance the understanding of the influence mechanism of lance con-figuration on the coal utilization and provide guidelines for the design of new lance configurations.

Effect of a self-rotating oxygen lance system on mass transfer between slag and molten steel

To improve the efficiency of the steelmaking process,a system of self-rotating lance was designed,and corresponding cold simulation mechanism was developed.The influence of the self-rotating lance on the mass transfer rate between slag and molten steel was investigated by comparing this novel system with the traditional oxygen lance.The results show that the self-rotating lance can stably rotate with a gas jet as the power source.The mass transfer rate increases with an increase in the top and bottom blow flow rates and with a decline in the lance position.Approximately 13.7% of the top blow flow rate is converted to stirring energy,which is approximately twice that of the traditional oxygen lance,and the mass transfer rate can increase by over 30%.Furthermore,the impact energy can be concentrated at different depths of the molten bath by adjusting the rotational speed.With the same energy density,the mass transfer rate produced by the self-rotating lance is higher;however,the influence of the energy density on the mass transfer rate is low when the rotational speed is 30-50 r/min.

触动浪漫心弦 邂逅法兰西风情 Lancel秋冬新品发布

源自法国,拥有130年悠久历史的奢华皮具世家Lancel 7月17日在上海发布了其秋冬季新款手袋,让新一季的时尚潮汐在城中涌动。Lancel秋冬季新款手袋的惊艳发布,带来一场充满法兰西风情的视觉盛宴。周樵、胥力文等名模悉数到场,全情演绎Lancel新款的神妙姿彩。

三重介质油藏模型及其Laplace空间解

本文建立了裂缝、洞与井筒连通的三重介质油藏的试井解释模型,利用Laplace变换和构造通解法,研究了这一类线性偏微分方程的边值问题,得到了其Laplace空间解,为裂缝、洞与井筒连通油藏的试井分析提供了坚实的理论基础。

Numerical Simulation of Decarburization in a Top-Blown Basic Oxygen Furnace

An improved mathematical model to describe the decarburization process in basic oxygen furnaces for steelmaking is presented in this work. This model takes into account those factors or parameters that determine the bath-oxygen impact area, such as the cavity depth, the lance height, the number of nozzles and the nozzles diameter. In the thermal issue, the model includes the targeted carbon content and temperature. The model is numerically solved, and is validated using reported data plant. The oxygen flow rate and the lance height are varied in the numerical simulations to study their effect on the carbon content and decarburization rate.

癌转移抑制因子NM23

美国国立癌中心(NCI)病理研究部主任Lance A.Liotta等认为,抑制癌转移的基因NM23所编码的蛋白与活体内起调节反应的G蛋白的调节的重要酶二磷酸核苷激酶(NDP激酶)是同一分子,他于7月3日在札幌召开的日本癌学会的特别讲演上发表了这一结果.

南非国家职业安全协会(NOSA)访问中国安科院

2014年9月25日,南非国家职业安全协会（NOSA）董事长杜坎·卡利瑟（Ducan Carlisle）先生、亚太区副总裁兰斯·西斯科（Lance Hiscoe）先生等一行4人来中国安全生产科学研究院访问,院党委书记吕敬民、副院长魏利军和科技发展部、审核认证中心主要负责人参加了交流会谈。吕敬民书记首先对杜坎·卡利瑟先生一行来访表示热烈欢迎,并回顾了南非国家职业安全协会的一些先进理念,特别是NOSA五星系统已被中国企业认可和采用,成为评定企业安健环水平的综合管理系统。

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Hubei Provincial Song and Dance Troupe’s Success in Malaysia

IN August this year,the HubeiProvincial Song and Dance Troupeput on 21 performances for 30,000people In 10 states during its one-month tour of Malaysia,entertain-ing audiences all across the coun-try.Many senior Malaysian gov-ernment leaders and importantpublic figures were among the au-diences,and the local newspapersreported it as the most

Interaction between a Liquid Surface and an Impinging Gas Jet

The water-air and Wood’s metal-air systems are modeled by means of Computational Fluid Dynamics to study the interaction between a liquid surface and an impinging air jet under the near field blowing conditions. The effect of the air jet velocity, the height of the injection lance, and the density of the liquid on the depth of the formed cavity is numerically studied. The CFD results of the cavity depth are compared with results previously reported by other authors. The emergence of the splashing phenomenon is predicted in terms of the critical velocity for each liquid-air system. Besides, the blowing number indicates that the drop generation rate is not significant for jet velocities below the critical velocity, and therefore neither the splashing is significant.