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旅游景区游客热能分布状态及疏导路径探析——以合肥市部分代表性旅游景区为例
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作者 李俊 《哈尔滨学院学报》 2018年第5期49-51,共3页
游客旅游时间、具体目的等差别使得景区游客人数时空分布不均匀,出现类似于交通分布状态的热能现象,即某个时段热能强,某个时段热能弱。在景区游客人数分布时空不均问题上,某些景区已经采用现代信息技术来随时监测游客热能状态。文章以... 游客旅游时间、具体目的等差别使得景区游客人数时空分布不均匀,出现类似于交通分布状态的热能现象,即某个时段热能强,某个时段热能弱。在景区游客人数分布时空不均问题上,某些景区已经采用现代信息技术来随时监测游客热能状态。文章以安徽省合肥市某些代表性的旅游景区为研究对象,通过观察、问卷调查、统计分析等方法,得出景区游客热能分布曲线和热能集散分布走势图,并在此基础上提出分时预约机制等疏导路径,旨在解决高峰期景区游客热能分布问题。 展开更多
关键词 旅游景区 热能分布 热能疏导 分时预约机制
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从传统陶瓷隧道窑的热能分布状况,探讨提高窑炉热能利用率的潜力 被引量:4
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作者 陈立骏 徐景维 《中国陶瓷工业》 CAS 1998年第1期23-26,共4页
本文通过部分产瓷区的传统陶瓷隧道窑热平衡测定数据的分析,探讨了降低烧成能耗,提高窑炉热效率的潜力。
关键词 陶瓷 隧道窑 热能分布 热能利用 窑炉
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基于导出式大功率LED用聚碳酸酯透镜热能分布的研究
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作者 林永南 叶晓云 《橡塑技术与装备》 CAS 2017年第24期22-25,共4页
针对大功率小光束角LED产品由于热能聚集导致产品性能下降、使用寿命缩短等问题。提出了采用吸热涂覆层导出式的热能散热分布系统,提升了大功率小光束角LED产品的使用性能及其使用寿命。
关键词 导出式 大功率LED 聚碳酸酯 热能分布
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关于烤箱加热的传热模型及器皿最优秀形状选择问题的研究 被引量:6
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作者 姚靖 王振华 +1 位作者 尹访宇 张瑞 《西安文理学院学报(自然科学版)》 2014年第1期77-82,共6页
从机理角度对烤箱内食物加热问题进行分析,并建立基于稳态热传导方程的传热模型,根据有限元算法运用MATLAB进行求解,给出了加热过程中几种典型形状食物的热能分布情况并得出圆形为器皿最优形状.
关键词 分布 稳态热传导方程 MATLAB温度场数值模拟 热能分布均匀系数
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用光学-光学双共振光谱技术研究Cs蒸气中的共振交换碰撞 被引量:1
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作者 王淑英 穆保霞 +4 位作者 崔秀花 张刚台 袁强华 戴康 沈异凡 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2006年第11期1981-1983,共3页
利用窄带半导体激光器泵浦所有具有相同z分量速度的基态Cs原子至激发态,研究了Cs(6P3/2,v)+Cs(6S1/2,v′)→Cs(6S1/2,v)+Cs(6P3/2,v′)的共振交换碰撞过程。与泵浦光反向平行的另一单模激光器激发6P3/2至8S1/2态,以检测6P3/2态原子的速... 利用窄带半导体激光器泵浦所有具有相同z分量速度的基态Cs原子至激发态,研究了Cs(6P3/2,v)+Cs(6S1/2,v′)→Cs(6S1/2,v)+Cs(6P3/2,v′)的共振交换碰撞过程。与泵浦光反向平行的另一单模激光器激发6P3/2至8S1/2态,以检测6P3/2态原子的速度分布,确定激发态原子的热能化效应。通过测量8S1/2→6P1/2荧光的尖峰强度与相应的多普勒背景的强度比,得到共振交换碰撞速率系数为k=9.62×10-7cm3.s-1。证明了在纯碱金属蒸气中,由共振交换机制产生的热能化效应的大小比由速度改变碰撞引起的大3个数量级。 展开更多
关键词 激光光谱 激发态原子速度分布热能 共振交换碰撞 速率系数
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Experimental study on thermal characteristics of a double skin faade building 被引量:2
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作者 王芳 张小松 +1 位作者 谭俊杰 李秀伟 《Journal of Southeast University(English Edition)》 EI CAS 2014年第4期462-466,共5页
An experimental study of the thermal characteristics of an existing office building with double skin facade DSF were conducted in hot summer daytime in Nanjing China. The temperature distributions of the DSF and indoo... An experimental study of the thermal characteristics of an existing office building with double skin facade DSF were conducted in hot summer daytime in Nanjing China. The temperature distributions of the DSF and indoor environment were measured at different control modes of DSF.The results show that the energy consumption of the air conditioning system in room B with opened exterior vents a closed interior facade and an air cavity with shading was 21.0% less than that in room A with closed exterior vents a closed interior facade and air cavity without shading in 9.5 h. The temperature distributions of the DSF and indoor environment in both horizontal and vertical directions were decisively influenced by shading conditions. The usage of shading devices strengthens the stack effect on the air cavity. Compared to room A the temperature distribution in room B is more uniform with smaller fluctuations.Meanwhile the problem of overheating in the air cavity of the DSF is still present in all tested conditions. 展开更多
关键词 double skin facade THERMAL characteristics temperature distribution energy consumption
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吹膜挤出机的电磁感应加热系统建模与有限元模拟研究
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作者 王超 柴雄 《工程塑料应用》 CAS CSCD 北大核心 2014年第12期66-70,共5页
为实现吹膜挤出机在电磁感应加热条件下能效的定量分析,对吹膜挤出机电磁感应加热的三维有限元模型进行了研究,导出了对应于指定机筒和螺杆材料的电流透入深度与电磁感应加热器的各设计参数之间的关系;分析了挤出机的机筒与螺杆等关键... 为实现吹膜挤出机在电磁感应加热条件下能效的定量分析,对吹膜挤出机电磁感应加热的三维有限元模型进行了研究,导出了对应于指定机筒和螺杆材料的电流透入深度与电磁感应加热器的各设计参数之间的关系;分析了挤出机的机筒与螺杆等关键部件在电磁感应三段式分区加热条件下的磁场分布、电流密度场分布及焦耳热能分布的相对趋势。结果表明,感应磁场主要分布在机筒内表面,而相应的感应电流主要分布在机筒外层,且当机筒上缠绕的3组匝数相同的电磁感应加热线圈中加载有大小相等、方向相同的交变电流时,电流密度和产生的焦耳热能集中在机筒和螺杆的中部,而适当增加进料段与计量段加热区所对应的两组线圈匝数可获得较为均匀的电磁感应加热效果。相对于电阻式加热,电磁感应加热的能量损耗较小,是一种环保节能的吹膜挤出机加热方式。 展开更多
关键词 电磁感应加热 挤出机 三维有限元模型 电流密度场分布 焦耳热能分布
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Parametric optimization of power system for a micro-CCHP system 被引量:2
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作者 李应林 张小松 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期297-301,共5页
The universal mathematical model of an engine is established,and an economical zone,in which an engine mainly provides medium output load at medium speed,is presented.Based on the experimental data and the universal m... The universal mathematical model of an engine is established,and an economical zone,in which an engine mainly provides medium output load at medium speed,is presented.Based on the experimental data and the universal model of such an engine above,a mathematical model of a refitted engine is provided.The boundary of the corresponding economical zone is further demarcated,and the optimal operating curve and the operating point of the engine are analyzed.Then,the energy transforming models of the power system are established in the mode of cooling,heating and power(MCHP),the mode of heating and power(MHP)and the mode of electricity powering(MEP).The parameter matching of the power system is optimized according to the transmission ratios of the gear box in the power distribution system.The results show that,in the MCHP,the speed transmission ratio of the engine to the gear box(ies)and the speed transmission ratio of the motor to the gear box(ims)are defined as 2.9 and 1,respectively;in the MHP,when the demand load of the power system is less than the low critical load of the economical zone,the speed transmission ratio of the motor to the engine(ime)is equal to 1,and when the demand load of the power system exceeds the low critical load of the economical zone,ime equals 0.85;in the MEP,the optimal value of ims is defined as 2.5. 展开更多
关键词 combined cooling heating and power distributed energy supply battery bank ENGINE
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Quasi-Local Energy Distribution and Thermodynamics of Reissner-Nordstrom Black Hole Surrounded by Quintessence 被引量:1
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作者 Mahamat Saleh Bouetou Bouetou Thomas Timoleon Crepin Kofane 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第2期291-295,共5页
We investigate quasi-local energy distribution and thermodynamics of the Reissner-Nordstr6m black hole space-time surrounded by quintessence. We use the quasi-local energy distribution from Einstein energy-momentum co... We investigate quasi-local energy distribution and thermodynamics of the Reissner-Nordstr6m black hole space-time surrounded by quintessence. We use the quasi-local energy distribution from Einstein energy-momentum complex. We plot the variation of the energies, temperature and heat capacity with the state parameter related to the quintessence ωq. We show that due to the presence of quintessence, the total energy of the outer region as well as the temperature and heat capacity decreases with the increase of the density of quintessence, while the total energy of the black hole region increases. 展开更多
关键词 quasi-local energy distribution thermodynamics Reissner-NordstrSm black hole QUINTESSENCE
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A comprehensive comparison on vibration and heat transfer of two elastic heat transfer tube bundles 被引量:7
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作者 闫柯 葛培琪 翟强 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期377-385,共9页
Elastic heat transfer tube bundles are widely used in the field of flow-induced vibration heat transfer enhancement. Two types of mainly used tube bundles, the planar elastic tube bundle and the conical spiral tube bu... Elastic heat transfer tube bundles are widely used in the field of flow-induced vibration heat transfer enhancement. Two types of mainly used tube bundles, the planar elastic tube bundle and the conical spiral tube bundle were comprehensively compared in the condition of the same shell side diameter. The natural mode characteristics, the effect of fluid-structure interaction, the stress distribution, the comprehensive heat transfer performance and the secondary fluid flow of the two elastic tube bundles were all concluded and compared. The results show that the natural frequency and the critical velocity of vibration buckling of the planar elastic tube bundle are larger than those of the conical spiral tube bundle, while the stress distribution and the comprehensive heat transfer performance of the conical spiral tube bundle are relatively better. 展开更多
关键词 planar elastic tube bundle conical spiral tube bundle mode characteristics heat transfer performance
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Model heat source using actual distribution of laser power density for simulation of laser processing 被引量:3
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作者 WANG Gen-wang DING Ye +2 位作者 GUAN Yan-chao WANG Yang YANG Li-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第10期3277-3293,共17页
The model of heat source(MHS) which reflects the thermal interaction between materials and laser during processing determines the accuracy of simulation results. To acquire desirable simulations results, although vari... The model of heat source(MHS) which reflects the thermal interaction between materials and laser during processing determines the accuracy of simulation results. To acquire desirable simulations results, although various modifications of heat sources in the aspect of absorption process of laser by materials have been purposed, the distribution of laser power density(DLPD) in MHS is still modeled theoretically. However, in the actual situations of laser processing, the DLPD is definitely different from the ideal models. So, it is indispensable to build MHS using actual DLPD to improve the accuracy of simulation results. Besides, an automatic modeling method will be benefit to simplify the tedious pre-processing of simulations. This paper presents a modeling method and corresponding algorithm to model heat source using measured DLPD. This algorithm automatically processes original data to get modeling parameters and provides a step MHS combining with absorption models. Simulations and experiments of heat transfer in steel plates irradiated by laser prove the mothed and the step MHS. Moreover, the investigations of laser induced thermal-crack propagation in glass highlight the signification of modeling heat source based on actual DLPD and demonstrate the enormous application of this method in the simulation of laser processing. 展开更多
关键词 heat source laser processing distribution of power density digital images processing heat transfer
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Estimation on Global Reaction Heat for the Aromatization Process of Liquefied Petroleum Gas 被引量:1
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作者 黎小辉 朱建华 郝代军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第8期906-913,共8页
The reaction heat effect analysis for the aromatization process of Liquefied Petroleum Gas (LPG) was completed in this paper. In order to characterize this complex reaction system, one set of independent reactions was... The reaction heat effect analysis for the aromatization process of Liquefied Petroleum Gas (LPG) was completed in this paper. In order to characterize this complex reaction system, one set of independent reactions was determined by means of atomic coefficient matrix method. Based on reaction thermodynamic and stoichiometric knowledge, the heat effect, Gibbs free energy change and equilibrium constant for each independent reaction was calculated for the specified conditions. Under these conditions, based on the initial and final composition data from LPG aromatization experiments, the actual extent of reaction for each independent reaction was determined. Furthermore, the global reaction heat and adiabatic temperature rise of LPG aromatization reaction system could be estimated. This work would provide a theoretical guidance for the design and scale-up of reactor for LPG aromatization process, as well as for the selection of proper operating conditions. 展开更多
关键词 global reaction heat aromatization process liquefied petroleum gas
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Pyrolytic and kinetic analysis of coastal plant Xanthium sibiricum
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作者 王晓宁 朱立猛 +4 位作者 秦松 张亦陈 刘逸尘 孙金生 李莉莉 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第1期135-138,共4页
The fuel properties of coastal plant Xanthium sibiricum were investigated in thermogravimetrics.The distributed activation energy model was employed in the kinetic analysis and a simplified mathematical model that can... The fuel properties of coastal plant Xanthium sibiricum were investigated in thermogravimetrics.The distributed activation energy model was employed in the kinetic analysis and a simplified mathematical model that can predict the thermogravimetry curves was proposed.The results show that the initial decomposition temperature tends to increase with the heating rate.The distributed E values ranged from 169.08 to 177.43 kJ/mol,and the frequency factor values ranged from 6.59× 10~8 to 1.22×10^(12)/s at different conversion rates.Furthermore,the prediction made with the simplified mathematical model perfectly matched the experimental data,and the model was found to be simple and accurate for the prediction of devolatilization curves. 展开更多
关键词 Xanthium sibiricum thermogravimetric analysis distributed activation energy model simplifiedmathematical model
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Effects of thermal transport properties on temperature distribution within silicon wafer
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作者 王爱华 牛义红 +1 位作者 陈铁军 P.F.HSU 《Journal of Central South University》 SCIE EI CAS 2014年第4期1402-1410,共9页
A combined conduction and radiation heat transfer model was used to simulate the heat transfer within wafer and investigate the effect of thermal transport properties on temperature non-uniformity within wafer surface... A combined conduction and radiation heat transfer model was used to simulate the heat transfer within wafer and investigate the effect of thermal transport properties on temperature non-uniformity within wafer surface. It is found that the increased conductivities in both doped and undoped regions help reduce the temperature difference across the wafer surface. However, the doped layer conductivity has little effect on the overall temperature distribution and difference. The temperature level and difference on the top surface drop suddenly when absorption coefficient changes from 104 to 103 m-1. When the absorption coefficient is less or equal to 103 m-1, the temperature level and difference do not change much. The emissivity has the dominant effect on the top surface temperature level and difference. Higher surface emissivity can easily increase the temperature level of the wafer surface. After using the improved property data, the overall temperature level reduces by about 200 K from the basis case. The results will help improve the current understanding of the energy transport in the rapid thermal processing and the wafer temperature monitor and control level. 展开更多
关键词 silicon wafer thermal transport properties temperature distribution radiation heat transfer
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A Numerical Model of a U-Tube Vertical Ground Heat Exchanger Used as an Evaporator
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作者 Benoit Beauchamp Louis Lamarche Stanislaw Kajl 《Journal of Energy and Power Engineering》 2013年第2期237-249,共13页
The paper presents a general distributed model of a vertical U-tube direct expansion heat exchanger coupled with the ground. This model is developed for studying the dynamic thermal behavior of a buried heat exchanger... The paper presents a general distributed model of a vertical U-tube direct expansion heat exchanger coupled with the ground. This model is developed for studying the dynamic thermal behavior of a buried heat exchanger which is an integral part of a so-called direct expansion heat pump. The transient conservative equations of mass, momentum and energy considering single and two-phase flow of refrigerant are derived and presented. The diffusive heat exchange with the ground is treated using an analytical approach to treat short-time scale response of vertical boreholes based on an imposed temperature. The thermal interference between the two pipes of the heat exchanger is also considered. The mathematical equations of the model are numerically presented using a control volume formulation and the solution of the system of equations is obtained by successive iterations. The dynamic behavior of the evaporator is simulated and the numerical results are analyzed regarding spatial parameters distribution and thermal interference influence. 展开更多
关键词 Direct expansion REFRIGERANT GROUND EVAPORATOR heat pump.
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Temperature Profiles in the Flow Channel of a Natural Convection Solar Air Heater
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作者 K.S. Ong B.T. Tan 《Journal of Energy and Power Engineering》 2011年第2期129-134,共6页
An experimental investigation was conducted to measure the temperature variation across the flow channel and to determine the performance of a natural convection solar air heater at various tilt angles from 15, 30 and... An experimental investigation was conducted to measure the temperature variation across the flow channel and to determine the performance of a natural convection solar air heater at various tilt angles from 15, 30 and 45°. The results of the temperature profile across the air gap showed that heat transfer from the absorber plate to the air stream was mainly by convection. At a particular section, mean air temperature could be calculated from the arithmetic mean of the temperature profile across the air gap to within ± 2 ℃. The axial air temperature distribution was non linear and did not increase much beyond 1 m of collector length. It tended to decrease towards the end of the collector. Overall glass, absorber plate and mean air temperatures over the entire length of the solar air heater could be determined by averaging the mean axial temperatures to within ± 2 ℃. The heater performed better as inclination increased. 展开更多
关键词 Solar air heater natural convection inclination effects temperature profile across air gap axial temperature distribution.
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A design method and numerical study for a new type parabolic trough solar collector with uniform solar flux distribution 被引量:16
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作者 WANG Kun HE YaLing CHENG ZeDong 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期531-540,共10页
The non-uniform concentrated solar flux distribution on the outer surface of the absorber tube can lead to large circumferential temperature difference and high local temperature of the absorber tube wall,which is one... The non-uniform concentrated solar flux distribution on the outer surface of the absorber tube can lead to large circumferential temperature difference and high local temperature of the absorber tube wall,which is one of the primary causes of parabolic trough solar receiver(PTR)failures.In this paper,a secondary reflector used as a homogenizing reflector(HR)in a conventional parabolic trough solar collector(PTSC)was recommended to homogenize the solar flux distribution and thus increase the reliability of the PTR.The design method of this new type PTSC with a HR was also proposed.Meanwhile,the concentrated solar flux distribution was calculated by adopting the Monte Carlo ray-trace(MCRT)method.Then,the coupled heat transfer process within the PTR was simulated by treating the solar flux calculated by the MCRT method as the heat flux boundary condition for the finite volume method model.The solar flux distribution on the outer surface of the absorber tube,the temperature field of the absorber tube wall,and the collector efficiency were analyzed in detail.It was revealed that the absorber tube could almost be heated uniformly in the PTSC with a HR.As a result,the circumferential temperature difference and the maximum temperature could be reduced significantly,while the efficiency tended to decrease slightly due to the inevitably increased optical loss.Under the conditions studied in this paper,although the collector efficiency decreased by about 4%,the circumferential temperature difference was reduced from about 25 to 3 K and the maximum temperature was reduced from667 to 661 K. 展开更多
关键词 parabolic trough solar collector evacuated tubular receiver secondary reflector solar flux distribution temperature distribution
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Towards quantum simulation of Sachdev-Ye-Kitaev model
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作者 Ye Cao Yi-Neng Zhou +1 位作者 Ting-Ting Shi Wei Zhang 《Science Bulletin》 SCIE EI CAS CSCD 2020年第14期1170-1176,M0003,M0004,共9页
We study a simplified version of the Sachdev-Ye-Kitaev(SYK) model with real interactions by exact diagonalization. Instead of satisfying a continuous Gaussian distribution, the interaction strengths are assumed to be ... We study a simplified version of the Sachdev-Ye-Kitaev(SYK) model with real interactions by exact diagonalization. Instead of satisfying a continuous Gaussian distribution, the interaction strengths are assumed to be chosen from discrete values with a finite separation. A quantum phase transition from a chaotic state to an integrable state is observed by increasing the discrete separation. Below the critical value, the discrete model can well reproduce various physical quantities of the original SYK model,including the volume law of the ground-state entanglement, level distribution, thermodynamic entropy,and out-of-time-order correlation(OTOC) functions. For systems of size up to N=20, we find that the transition point increases with system size, indicating that a relatively weak randomness of interaction can stabilize the chaotic phase. Our findings significantly relax the stringent conditions for the realization of SYK model, and can reduce the complexity of various experimental proposals down to realistic ranges. 展开更多
关键词 Sachdev-Ye-Kitaev model Ground-state entanglement Gaussian orthogonal ensemble Out-of-time-order correlation
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