We present a novel approach to control endothelial tubulogenesis by spatially patterning cells within micromolded collagen gels. Endothelial cells cultured within microscale channels that were filled with collagen gel organized into tubes with lumens within 24-48 h of seeding. These tubes extended up to 1 cm in length, and exhibited cell-cell junction formation characteristic of early stage cap...

Thrust from a multicycle pulse detonation engine operating at practical flight altitudes will vary with surrounding environment pressure. We have carried out the first experimental study using a detonation tube hung in a ballistic pendulum arrangement within a large pressure vessel to determine the effect that the environment has on the single-cycle impulse. Air pressure decreased below 100 kPa...

The paper presents a survey of the experimental and numerical studies shell-and-tube systems in which phase change material (PCM) is used. Due to multitude design solutions for systems, emphasis placed on double-tube (DT), triplex-tube (TT), multi-tube (MT) units. Additionally, only single-pass are considered. Particular attention paid method heat transfer intensification. analysis research res...

Nowadays, thermal energy storage using Phase Change Materials (PCMs) receives a great interest due to its high density especially for low and medium temperature applications. Nevertheless, PCM suffers from the conductivity during charging discharging of heat. In this study, multiple technique has been investigated as enhancement in shell-and-tube heat exchanger. The investigations have conducte...

hot spots are among the most serious operational issues in furnaces as they may result in the destruction of tubes. hence, it is essential to locate such hot spots precisely on the tube surfaces inside the industrial furnaces in order to secure a safe design and operation. in the current study, we have extended the model proposed by talmor in order to precisely locate the combustion hot spots o...

Hot spots are among the most serious operational issues in furnaces as they may result in the destruction of tubes. Hence, it is essential to locate such hot spots precisely on the tube surfaces inside the industrial furnaces in order to secure a safe design and operation. In the current study, we have extended the model proposed by Talmor in order to precisely locate the combustion hot spots o...

Hot spots are among the most serious operational issues in furnaces as they may result in the destruction of tubes. Hence, it is essential to locate such hot spots precisely on the tube surfaces inside the industrial furnaces in order to secure a safe design and operation. In the current study, we have extended the model proposed by Talmor in order to precisely locate the combustion hot spots o...

Improved inclusion-exclusion inequalities for unions of sets are available wherein terms usually included in the alternating sum formula can be left out. This is the case when a key abstract tube condition, can be shown to hold. Since the abstract tube concept was introduced and refined by the authors, several examples have been identified, and key properties of abstract tubes have been describ...