摘要：太阳能水蒸发对于解决净水危机潜力无限.随着研究的深入,研发高效光热转换材料和合理的材料结构设计均可以提高光热蒸发速率.因此,我们设计合成了一种双层碳基水凝胶复合材料.在一个太阳光照条件下,其最大蒸发速率可达2.19 kg m^(−2)h^(−1),光热转换效率可达93.7%.同时,该复合材料展现了优异的海水淡化性能及良好的稳定性,扩展了实际应用范围.除此之外,其可控规模化及便携性可以自如面对多种复杂的应用环境,成本低廉可以使其大规模应用于经济落后地区,为复合结构水凝胶蒸发器的生产提供了可供参考的设计思路和策略.

摘要：为进一步说明之前的文章,提出了支持面向特定系统表现特征(system manifestation feature,SMFs)的信息管理和构成系统模型编程的信息模式构造(information schema construct,ISCs)。首先,简要介绍了(1)利用SMFs进行具体化设计的一般过程,(2)创建基因型和表型SMFs的步骤,(3)表型SMFs实例化的具体步骤,以及(4)系统模型管理和处理的步骤。接着,讨论了表型SMFs实例化所需的信息块,提出了为实现SMFs实例化而设计的ISCs。然后,讨论了与系统建模相关的信息管理问题。在研究方法上,系统建模包括(1)在模型空间中放置表型SMFs,(2)针对所需架构和操作,组合所放置的表型SMFs,(3)参数赋值以及约束条件符合程度检查,以及(4)在基于SMFs的数据仓中存储系统构建模型。研究的最终目标是开发一个支持信息物理系统(cyber-physical systems,CPSs)建模的基于SMFs的工具箱。

摘要：The finite element system CAPA-3D was utilized as the numerical simulation platform,two structural FE models of orthotropic steel bridge decks were set up,the static and dynamic FE simulations under different loading conditions were carried out,the special attention was given to identify the critical wheel load location,and the maximum tensile stress distribution and the variation of strain rate inside membrane *** result shows that the FE models are capable of simulating the realistic behavior of orthotropic steel *** distributions of strains and stresses inside the surfacing materials depend highly on wheel load level,wheel load frequency,wheel position,membrane bonding strength as well as the thicknesses and characteristics of surfacing *** maximum tensile stress of membrane layers is found around 0.4MPa,which coincides with the minimum requirement for the adhesive bonding strength of membrane material proposed by the standards NF P98-282and *** maximum membrane strain rate is found around 0.1,which is an important information that can be utilized for the characterization of membrane products.1tab,28figs,7refs.

摘要：Technological and economic opportunities,alongside the apparent ecological benefits,point to biodesign as a new industrial paradigm for the fabrication of products in the twenty-first *** presented work studies plant roots as a biodesign material in the fabrication of self-supported 3D structures,where the biologically and digitally designed materials provide each other with structural *** a material-driven design approach,we present our systematic tinkering activities with plant roots to better understand and anticipate their responsive *** helped us to identify the key design parameters and advance the unique potential of plant roots to bind discrete porous *** illustrate this binding potential of plant roots with a hybrid 3D object,for which plant roots connect 600 computationally designed,optimized,and fabricated bioplastic beads into a low stool.

摘要：Role based access control is one of the widely used access control *** are investigations in the literature that use knowledge representation mechanisms such as formal concept analysis(FCA),description logics,and Ontology for representing access control ***,while using FCA,investigations reported in the literature so far work on the logic that transforms the three dimensional access control matrix into dyadic formal *** transformation is mainly to derive the formal concepts,lattice structure and implications to represent role hierarchy and constraints of *** this work,we propose a methodology that models RBAC using triadic FCA without transforming the triadic access control matrix into dyadic formal *** discussion is on two lines of *** present how triadic FCA can provide a suitable representation of RBAC policy and we demonstrate how this representation follows role hierarchy and constraints of RBAC on sample healthcare network available in the literature.

摘要：在现代四击的引擎技术，可变阀门预定和电梯控制提议潜力为做一台高效的引擎受益。去四击的汽车的引擎的一列新奇电镀物品水力的充分可变的阀门火车被介绍。阀门火车系统和它的动态分析的非线性的数学模型的构造也被介绍。试验性并且模拟结果证明新奇电镀物品水力的阀门火车能完成充分可变的阀门预定和电梯控制。因而，不同负担和速度上的引擎表演将显著地被增加。技术也允许消除传统在汽油引擎和增加引擎设计灵活性扼杀阀门。

摘要：The aim of this study is to determine the effect of the main chemical components of biomass: cellulose, hemicellulose and lignin, on chemical kinetics of biomass pyrolysis. The experiments were designed based on a simplexlattice mixture design. The pyrolysis was observed by using a thermogravimetric analyzer. The curves obtained from the employed analytical method fit the experimental data(R2N 0.9). This indicated that this method has the potential to determine the kinetic parameters such as the activation energy(Ea), frequency factor(A) and reaction order(n) for each point of the experimental design. The results obtained from the simplex-lattice mixture design indicated that cellulose had a significant effect on Eaand A, and the interaction between cellulose and lignin had an important effect on the reaction order, n. The proposed models were then proved to be useful for predicting pyrolysis behavior in real biomass and so could be used as a simple approximation for predicting the overall trend of chemical reaction kinetics.

摘要：Classical transonic hodograph-based design methods are employed and revitalized using modern numerical tools to illustrate the design of a symmetrical accelerating-decelerating nozzle throat design. The concept of Elliptic Continuation is applied to solve transonic boundary value problems avoiding the inherently nonlinear nature of the basic equations and obtaining transonic flow examples using the Method of Characteristics in an inverse mode. Purpose of the present paper, besides describing a new special flow example, is to keep these classical methods alive for education of a new generation of creative engineers.

摘要：Conventional attractive magnetic force models (proportional to the coil current squared and inversely proportional to the gap squared) cannot simulate the nonlinear responses of magnetic bearings in the presence of electromagnetic losses,flux leakage or saturation of *** this paper,based on results from an experimental set-up designed to study magnetic force,a novel parametric model is presented in the form of a nonlinear polynomial with unknown *** parameters of the proposed model are identified using the weighted residual *** of the model identified were performed by comparing the results in time and frequency *** results show a good correlation between experiments and numerical simulations.

摘要：The selected modifications to the construction of grinding wheels were described which facilitate an increase in the material removal rate(grinding wheels with conic chamfer and grinding wheels with microdiscontinuities on the active surface).Using these background details,a suggested thesis was put forward regarding the need to develop a device which will allow for the shaping of the macrogeometry of the grinding wheel(cylindrical and conical surfaces) and the microdiscontinuities within the dressing operation *** device was presented and prepared in two functional variants(horizontal and vertical mounting of the motor),then a prototype was *** example of the grinding wheel active surface,shaped by using this device,was also *** theoretical analysis and experimental verification performed determine that the error of shaping the conic chamfer angle within the range of 0-1.5o,using the developed device,is approximately ±3%.