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61.
Gunay Omer Abdullah Hakan Yavuz Rasit Ahiska 《International Journal of Hydrogen Energy》2017,42(12):8310-8313
This study investigates the load characteristics of heat pipe thermoelectric solar collector (HPTSC) in practice. Heat pipe thermoelectric solar collector converts the heat generated by the Sun directly into electrical energy and produces hot water as well. The maximum power in HPTSC is obtained when the internal resistance of the thermoelectric module is equal to the load resistance. It has been observed to be possible to produce both hot water and electricity by improving available solar collectors or producing new generation HPTSC. While it is possible to generate an electrical power of 160 W from a HPTSC of one square meter using the thermoelectric method, the power produced with an average photovoltaic panel with the same area is only 132 W. Accordingly, HPTSC is a superior alternative not only to available solar collectors, but also to available PV panels. HPTSC, involving three different technologies, is environmentally friendly and certainly a product that allows for more efficient use of solar energy. 相似文献
62.
Degani Asaf Goldman Claudia V. Deutsch Omer Tsimhoni Omer 《Cognition, Technology & Work》2017,19(2-3):211-231
Cognition, Technology & Work - This paper presents an approach to human–machine interactions based on the concept of teamwork and the psychological theory of object relations. We envision... 相似文献
63.
O. Fatih Kilic M. Omer Sayin Ibrahim Delibalta Suleyman S. Kozat 《Signal, Image and Video Processing》2017,11(2):235-242
We introduce a new combination approach for the mixture of adaptive filters based on the set-membership filtering (SMF) framework. We perform SMF to combine the outputs of several parallel running adaptive algorithms and propose unconstrained, affinely constrained and convexly constrained combination weight configurations. Here, we achieve better trade-off in terms of the transient and steady-state convergence performance while providing significant computational reduction. Hence, through the introduced approaches, we can greatly enhance the convergence performance of the constituent filters with a slight increase in the computational load. In this sense, our approaches are suitable for big data applications where the data should be processed in streams with highly efficient algorithms. In the numerical examples, we demonstrate the superior performance of the proposed approaches over the state of the art using the well-known datasets in the machine learning literature. 相似文献
64.
采用XRD、SEM、TEM等分析手段对由液相包覆工艺制备的Ce—TZP陶瓷的微结构进行了研究,并和共沉淀粉体制备的Ce—TZP陶瓷进行了对比分析.力学性能表明,同共沉淀粉体制备的Ce—TZP陶瓷相比,由液相包覆工艺制备的Ce—TZP陶瓷虽硬度下降,但断裂韧性改善;液相添加少量Al2O3硬度随之增加、断裂韧性显著提高.电镜分析表明,液相包覆工艺制备的Ce—TZP陶瓷晶粒尺寸分布宽化,一部分晶粒尺寸较大但CeO2含量低、易发生马氏体相转变晶粒的存在是断裂韧性改善的主要原因.陶瓷体中单斜相大晶粒与四方相之间的残余应力、添加少量Al2O3在晶界上易形成薄的非晶包裹层,是增加可相变四方相数量,提高断裂韧性的其它机制。 相似文献
65.
Oncu Akyildiz Ersin Emre Oren Tarik Omer Ogurtani 《Journal of Materials Science》2011,46(18):6054-6064
A systematic study based on the self-consistent dynamical simulations is presented for the grain boundary thermal grooving
problem by strictly following the irreversible thermodynamic theory of surfaces and interfaces with singularities [T. O. Ogurtani,
J. Chem. Phys. 124, 144706 (2006)]. This approach furnishes us to have auto-control on the otherwise free-motion of the grain
boundary triple junction without presuming any equilibrium dihedral (wetting) angles at the edges. The effects of physicochemical
properties and the anisotropic surface diffusivity on the transient grooving behavior, which takes place at the early stage
of the scenario, were considered. We analyzed the experimental thermal grooving data reported for tungsten in the literature,
and compared them with the carried simulation results. This investigation showed that the observed changes in the dihedral
angles are strictly connected to the transient behavior of the simulated global system, and manifest themselves at the early
stage of the thermal grooving phenomenon. 相似文献
66.
This paper presents a set of regression models which incorporates concrete and steel types in modeling the costs of office buildings. To these ends, three typical office buildings with seven and 15 stories have been designed by the help of a commercial software taking into account the Turkish practice. In each project C-16, C-20, C-25, C-30 and C-35 concrete classes and S-220 and S-420 steel types were used for dimensioning purposes. Rough construction costs were then calculated for different combinations of concrete classes and steel types. The findings of the study revealed that column dimensions decrease following an increase in a particular concrete class. However, this decrease stops after C-30. Furthermore, an average cost difference of 16% was observed between the steel types S-220 and S-420. 相似文献
67.
Collections of batteries are used to supply energy to a variety of applications. By utilizing the energy in such a collection efficiently, we can improve the lifetime over which energy can be supplied to the application. We say that the discharge of a collection of batteries is coordinated when, at the end of discharge, the difference in the remaining capacity of individual batteries is small. This paper presents a decision-maker based on a goal-seeking formulation that coordinates the discharge of a collection of batteries. This formulation allows us to use a simple battery model and simple decision-making algorithms. We present results from MATLAB simulations that demonstrate the performance of the decision-maker when energy is drawn out of the collection in three different discharge scenarios. The new decision-maker consistently improves the discharge efficiency obtained using scheduling methods. Our results show that when the discharge is coordinated, the lifetime of the collection is extended. 相似文献
68.
This paper presents monitoring results of two examples of building integrated PV system investigated at the School of the Built Environment, University of Nottingham in the UK. One of the systems is installed on an educational building, and consists of a thin film PV façade appropriate for commercial or office suites. The other system is installed on a detached house, and uses crystalline PV roof slates, appropriate for domestic buildings. As the two buildings are significantly different in size, construction and occupancy, the design and selection of the PV system for each was also different. The monitoring investigation has assisted identification of shortfalls in performance and possible explanations have been suggested. The results presented in this paper provide information on the design process, and highlight similarities and differences in the design, installation, performance and economics of the two systems. 相似文献
69.
In this study, the change in the load-bearing system cost of a reinforced concrete office building has been investigated in relation to the earthquake regions and soil types. Three different office projects each with five stories were investigated. The structural design calculations have been made according to four different soil types and four different earthquake regions. According to each combination, concrete, steel and formwork adopted approximations were calculated to reach the rough cost of each office building. The changes in the cost of projects according to the soil type and earthquake region were examined with multiple regression analysis and analysis of variance. In general, the change in cost has been observed around 22% between first and fourth soil type and 14% between first and fourth earthquake region. 相似文献
70.
Zohar Yosibash Netta Omer Martin Costabel Monique Dauge 《International Journal of Fracture》2005,136(1-4):37-73
The solution to elastic isotropic problems in three-dimensional (3-D) polyhedral domains in the vicinity of an edge is provided
in an explicit form. It involves a family of eigen-functions with their shadows, and the associated edge stress intensity
functions (ESIFs), which are functions along the edges. Utilizing the explicit structure of the solution in the vicinity of
the edge we use the quasidual function method, recently presented in [Omer et al. (2004). International Journal of Fracture 129:97–130] for scalar elliptic problems and in [Costabel et al. (2004). SIAM Journal of Mathematical Analysis 35(5), 1177–1202] in a general theoretical framework, for the extraction of ESIFs. This method provides a polynomial approximation
of the ESIF along the edge whose order is adaptively increased so to approximate the exact ESIF. It is implemented as a post-solution
operation in conjunction with the p-version finite element method. Numerical examples are provided in which we extract ESIFs associated with traction free or
homogeneous Dirichlet boundary conditions in 3-D cracked domains or 3-D V-Notched domains. These demonstrate the efficiency,
robustness and high accuracy of the proposed quasi-dual function method. 相似文献