Delay Locked Loops (DLLs) and Phase Locked Loops (PLLs) are commonly used as a synthesizer or clock and data recovery circuit in most of the communication systems. In this paper, a new DLL is designed based on PRP conjugate gradient algorithm. The proposed DLL do not need any phase frequency detector, charge pump and loop filters, hence it can contribute better jitter performance and higher speed in comparison with conventional DLLs. In this design, PRP conjugate gradient algorithm is used to optimize the delay amount of each delay cells therefore helps the DLL to lock more accurately and quickly compared with gradient algorithm. In addition, for applying the PRP conjugate gradient algorithm a digital signal processor is used in the proposed architecture. To show the accuracy of the proposed structure’s operation, simulation has been done for 15 delay cells and fREF is chosen 14MHz to have output frequency 14×15=210MHz. fOUT=210 MHz is one of the channels in Iran VHF frequency band. As shown with simulation, the proposed architecture has a locking time of approximately 286nsec which is equal to 4 clock cycles of the reference clock.

ructural properties of activated sludge flocs were found to be sensitive to small changes in ionic strength. This study investigates the effect of ionic strength on SETTLING of activated sludge. Samples were taken from activated sludge process of Ghazvin Sasan soft drink wastewater treatment plant, then treated with different ionic strengths of KCl and CaCl2 solution, after that the turbidity of supernatant was measured. The results indicated that low ionic strength resulted in a steeper slope of the accumulated turbidity data for both KCl and CaCl2 as a result of a release of floc fragments and free cells into the supernatant, which did not precipitate during the incubation period. By increasing the ionic strength, the sedimentation improved because of less fragmentation of the sludge flocs. Also at low ionic strengths, the dissociation coefficient was high as a result of a substantial fragmentation of the sludge flocs. The dissociation of the flocs decreased as the ionic strength increased, resulting in a minimum of floc degradation in ionic strength between 0.006 and 0.06M.

Circulation regions always exist in SETTLING tanks. These regions reduce the tank's performance and decrease its effective volume. The recirculation zones would result in short-circuiting and high flow mixing problems. The inlet position would also affect the size and location of the recirculation region. Using a proper baffle configuration could substantially increase the performance of the SETTLING tanks. A common procedure for the comparison of the performances of different tanks has been using the Flow Through Curves (FTC) method. FTC, however, neglects tendencies for particles sedimentation. In this work, a new method for evaluation of the SETTLING tanks performance is presented. The new method which is referred to as the particle Tracking Method (PTM) is based on an Eulerian-Lagrangian approach. In this paper, by using FTC and PTM the effects of the inlet position and the baffle configuration on the hydraulic performance of the primary SETTLING tanks were studied and results were compared. Then, shortcomings of the FTC approach were stated. The optimal positioning of the baffles was also determined though a series of computer simulations.

Refugees and asylum seekers arriving in Europe during the 2015/2016 wave of migration have been exposed to war conditions in their country of origin, survived a dangerous journey, and often struggled with negative reception in transit and host countries. The mental health consequence of such forced migration experiences is named the Ulysses syndrome. Policies regarding the right to residency can play an important role in reducing mental health symptoms. We propose that facilitating a sense of belonging should be seen as one important preventive mental healthcare intervention. A refugee mental health agenda needs to take into account the interplay between refugees’ and asylum seekers’ mental health, feeling of belonging, and access to healthcare. We urge for policies to restore individuals’ dignity, and recognize the right for homecoming to parallel the mythology of Ulysses.