Recent Patents on Engineering - Volume 12, Issue 2, 2018

Background: Nanoscale zero valent iron (nZVI) is one of the most commonly used nanomaterials for soil and groundwater remediation because of its high reactivity and effective contaminant removal rate. Objective: This paper reviews the methods of nZVI syntheses and effect of nZVI application on contaminants removal, environmental conditions, and microbial growth when anaerobic bioremediation is used for pollut Read More

Background: Fluid flow control techniques gained many advantages when, under the newly coined name fluidics, were found ways of operating without moving or deformed mechanical components. In particular, it became possible to handle fluid motion at very small scales and/or high frequencies. The control signals upon which this motion depends, are often produced by microelectronic devices, also operating without Read More

Background: The finite element method (FEM) has been widely applied in the research of metal machining which can improve the efficiency and reduce the cost of research. 3-D finite element simulation attracts more attention on the research of mechanism and parameter optimization of high-speed machining. Methods: This paper reviews the theses of 3-D finite element simulation in recent years, especially focuses on th Read More

Background: Bi2O2CO3 as a typical Aurivillius type bismuth-based layered structure photocatalyst material has received wide attention. It is very important to explore the improving strategy for Bi2O2CO3. Methods: Herein, the preparation methods of Bi2O2CO3 and its application in environmental decontamination were summarized. Patents related to the subject were also reviewed. The modification methods for imp Read More

Background: Damage identification at the earliest possible stage is very important for beam structures to ensure safety, extend serviceability, and reduce maintenance costs according to recent patents. Methods: The goal of this work is to develop a virtual load method for beam damage identification by using only the vibration modes of the current structure. Central to the damage identification approach is the constructio Read More

Background: Damper bar is an important component to ensure the security and stability operation of generator. Some patents have been proposed in recent years to deal with generator vibration. Based on the damages of damper bars appeared in many hydropower units, the influences of damper bar material on generator operating characteristics are analyzed. Objective: This study aims to find the suitable material for da Read More

Background: Patents revealed that Double Horse Head (DHH) pumping unit is one of the improved models developed from the conventional units, and some unbalanced crank torque may cause high cycle alternating stress which can lead to cracking failure in some key components. This makes the research on simulation of crank torque in beam pumping units a more interesting topic in its maintenance operation. Objective: This Read More

Background: Ultra-wideband (UWB) Impulse Radio (IR) systems have been widely applied to some fields according to the recent patents which coexist with Beidou navigation satellite system (BDS), thus UWB signals may act as a broadband interference to BDS receivers and a threat to disrupt their normal operation. Objective: The study aimed to evaluate the acquisition performance of a BDS receiver with UWB-IR interf Read More

Background: Rock abrasiveness is a factor with considerable influence on the wear of tools in well drilling. However, it is determined with various methods, which result in no uniform standard formed. Objective: The goal of this work is to develop a wear calculation model of PDC compact and a prediction model of rock abrasiveness. Methods: Studies on rock abrasiveness evaluation equipments were carried out in Northeast Pe Read More