.Traditional zero-shot object-detection algorithms detect images of untrained classes in the model with the help of semantic embedding. However, these approaches may perform poorly due to the limitations of fixed semantic embedding. Given that fixed semantic attributes lead to a lack of generalization capabilities in the model, a semantic enhancement mechanism is proposed to update the semantic embedding, which is used to serve the needs of the visual space. Specifically, considering that the original semantic space is not enough to construct a visual-semantic mapping relationship, an augmented semantic embedding (ASE) approach is designed to supplement semantic attribute information. Then, a semantic channel attention mechanism is used to adjust the ASE. The adjustment strategy retains adequate attribute information, which is highly relevant to visual features. Finally, to alleviate the domain shift problem, a clustering association strategy is introduced to establish an inferred relationship, which ensures that the predictor is generalized to the unseen domain during training. The superiority of the proposed method is demonstrated by the MS-COCO and PASCAL VOC datasets.
A grey box model of screw ground source heat pump unit has been established and operating characteristics of the unit using R22 refrigerants were simulated. The effects on refrigerating capacity, heating capacity, power consumption of the compressor and COP on conditions of cooling and heating have been analyzed with different inlet water temperature of evaporator and inlet water temperature of condenser. Results show that main factor which affecting COP of heat pump unit is inlet water temperature of condenser. The change of refrigerating capacity and heating capacity are mainly caused by inlet water temperature of evaporator. Measures can be done to decrease the inlet water temperature of condenser when the unit operates for a long time and to increase inlet water temperature of evaporator on very hot or very cold conditions.
Lubricating oil transfer pump is important functional subsystem in two-screw pump system, and all moving parts works very fast, it is easy to generate heat, that not only affect the lubricating oil transfer pump’s temperature field, but also make transmission failure by the thermal deformation which caused by high temperature of parts in contact. This paper established a finite element thermal analysis model and boundary conditions of lubricating oil transfer pump, and calculated the temperature field and thermal deformation for it during the process of oil extraction in different coefficient of convective heat transfer, analysis the change rule of the steady state temperature field and thermal deformation, proved that lubricating oil transfer pump can normal work in certain conditions.
The purpose of this study is to investigate the thermal environment of a radiant floor cooling system using the existing radiant floor heating system. The thermal environment of the model office space was analyzed using Computational Fluid Dynamics (CFD) method. Two typical air distributions (hybrid air cooling system composed of radiant floor cooling and displacement ventilation and all-air system) were simulated. Installing two human models in the office, the characteristics of heat transportation from the human model were also analyzed. The results show that two air distribution forms can meet the demand of thermal comfort. The operative temperature in the radiant floor cooling system was lower than in the all-air cooling system when each of the sensible cooling loads of the two types of HVAC system was the same.
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