The purpose of this work is to examine the interplay between hydrodynamic conditions and physicochemical interactions from filtration experiments of microparticles. Experiments are performed in microfluidic filters with real-time visualization at pore scale. Both flow rate and pressure are measured with time to analyze the dynamics of pore clogging and permeability. Flux stepping experiments ar...

Many cryptographic key exchange and management protocols involve computationally expensive operations, such as modular exponentia-tions, and are therefore vulnerable to resource clogging attacks. This paper overviews and discusses the basic principles and the rationale behind an anti-clogging mechanism that was originally designed and proposed to protect the Photuris Session Key Management Prot...

A common failure mode for landfills is clogging of the leachate collection system. Based on the studies of clogging about landfill leachate collection system, the influence factors about clog were comprehensively and systematically analyzed .The results show that calcium is the dominant mineral of the dry mass of clog material, and CaCO3 is the main component of the clog. The growth of biomass,...

introduction: water scarcity is one of the major problems for crop production. using drip irrigation as an effective method in the efficient use of water is expanding in arid and semi-arid regions. one of the problems in under pressure irrigation during use of saline, unconventional and waste is emitters clogging. there are several ways to prevent particle deposits in pipes and clogging of emit...

Clogging of permeable interlocking concrete pavements (PICP) due to the sediment contained in stormwater runoff has been shown to significantly reduce their infiltration capacity over time. Numerous studies have used laboratory-based PICP models and synthetic stormwater in an attempt to replicate and predict the clogging processes that occur in PICP field installations. A variety of sediment ty...

Clogging of the tundish nozzle is a major castability problem in continuous casting of steel for several reasons. Firstly, clogging increases the frequency of operation disruptions to change nozzles or tundishes or even to stop casting. These extra transitions increase operating cost, decrease productivity, and lower quality. Secondly, clogging can lead directly to a variety of quality problems...

Clogging of subsurface flow (SSF) treatment wetlands due to excess biofilm growth is a design problem for which only empirical guidelines exist. A method is proposed to systematically analyze this type of clogging as a design tool. In recognition of the physical reality that most SSF treatment wetland processes are a function of biofilm surface area, a Damköhler number (Da) definition based on ...

In this paper we study a scheme for making cryptanalysis and security improvement. This protocol by Song, is a password authentication protocol using smart card. We note that this protocol has been shown to be prone to the offline password guessing attack. We perform an additional cryptanalysis on this scheme and detect that it is vulnerable to the clogging attack, a type of denial-of-service a...

Causes for the increase of the pressure loss of fine bubble diffusers made of elastomers were investigated. Methods are described for removing clogging material from membrane diffusers and/or attenuating or even avoiding the formation of clogging deposits. On the basis of some practical examples the procedure is discussed and obtained reductions of pressure losses are specified.

introduction: an appropriate water resources management and planning is necessary due to the scarcity of water resources and rapidly growing world population. in this regard, selecting appropriate methods for irrigation is one of the most important issues. drip irrigation is a recent advanced irrigation method in which fertilizers can be efficiently applied along with irrigation water. drip fer...