Efficiency of quantum controlled non-Markovian thermalization

We study optimal control strategies to optimize the relaxation rate towards the fixed point of a quantum system in the presence of a non-Markovian dissipative bath. Contrary to naive expectations that suggest that memory effects might be exploited to improve optimal control effectiveness, non-Markovian effects influence the optimal strategy in a non trivial way: we present a necessary condition to be satisfied so that the effectiveness of optimal control is enhanced by non-Markovianity subject to suitable unitary controls. For illustration, we specialize our findings for the case of the dynamics of single qubit amplitude damping channels. The optimal control strategy presented here can be used to implement optimal cooling processes in quantum technologies and may have implications in quantum thermodynamics when assessing the efficiency of thermal micro-machines.Comment: 7 pages, 3 figure

Measuring the Efficiency of Pesantren Cooperatives: Evidence in Indonesia

The Cooperative (Koperasi) as a non-Bank financial institution has the purpose of improving the welfare of its members as Koperasi Hidmat and the staffs of Latifah Mubarokiyah Koperasi Ponses Suryalaya that have been since decades ago. Over time, the ideal cooperative can show a significant development and increase the welfare of its members. This study aims to determine the efficiency of cooperative as a benchmark, because by known the performance value of a cooperation, it will known the weeknesses and advantages so that it can be improved the weaknesses and maintain the advantages.The method used is apply Data Envelopment Analysis (DEA). Inputs used from principal savings, mandatory savings, and fixed assets while the output used from savings in the cooperative, savings in other cooperative and SHU. As for result of this research indicates there are 9 perfect efficient DMUs (100 %) and inefficient DMU is 11 DMUs, consisting of 7 (IRS conditions) and 4 (DRS condition). The most inefficient cooperative is Koperasi Hidmat (2014) of 30.66% efficiency level.Kopkar IAILM is able to maintain its grade efficiency level from 2009 to 2015 when compared to other DMUs cooperatives in the observation, except in 2014. The calculation of efficiency level in this research is relative and it is not absolute, so that it is possible when the cooperative sample is added or the observation year is expanded, so it will get different result. The necessity of any cooperative or BMT based on Pondok Pesantren to make annual financial statements in order to increase accountability and transparency of fund management

Investigation of the Efficiency of Use of Polycomponent Acidifiers in the Technology of Rye- Wheat Bread

The polycomponent acidifiers “Optimal 1” and “Optimal 2” were elaborated at the National University of food technologies (Kyiv city, Ukraine) for intensifying the technology of rye-wheat bread and prolongation of its freshness.The composition of acidifiers includes the enzymatic preparations (EP) Glusim 10000 Mono (glucose oxidase) that favors the improvement of structural-mechanical properties of dough, EP Pentopan 500 BG (mixture of pentosanase and hemilcellulase) that favors the modification of non-starched polysaccharides and provides elastic crumb. For providing the proper dough acidity and intensification of the process of dough fermentation, the acidifier composition is added with citeric acid and dry milk serum (DMS), and for improving organoleptic parameters – with rye fermented malt (RFM). For increasing dough water-absorbing ability and keeping products\u27 freshness in the process of storage, guar gum is added.The optimal dosage of PCA “Optimal 1” and “Optimal 2” in the recipe of rye-wheat bread is 2 % to the flour mass.There are considered technological aspects of acidifiers use. There are considered processes, connected with stalling, loss of organoleptic and physical-chemical parameters of the bread quality at storage. The positive effect of acidifiers on the parameters of crumbling and swelling of bread crumb at the accelerated technology of its preparation. It was established, that the use of acidifiers favors the deceleration of rye-wheat bread staling. There was obtained the positive influence of acidifiers on preserving smell and taste of ready products. The obtained results prove the expedience of using the elaborated polycomponent acidifiers “Optimal 1” and “Optimal 2” in the technology of rye-wheat bread at its accelerated preparation. The use of the elaborated acidifiers favors the shortening of the technological process of rye-wheat bread production in 2,5-3 times and provide freshness, taste and smell preservation in ready products

Energy efficiency-spectral efficiency trade-off of transmit antenna selection

We investigate the energy efficiency-spectral efficiency (EE-SE) trade-off of transmit antenna selection/maximum ratio combining (TAS) scheme. A realistic power consumption model (PCM) is considered, and it is shown that using TAS can provide significant energy savings when compared to multiple-input multiple-output (MIMO) in the low to medium SE region, regardless the number of antennas, as well as outperform transmit beamforming scheme (MRT) for the entire SE range. For a fixed number of receive antennas, our results also show that the EE gain of TAS over MIMO becomes even greater as the number of transmit antennas increases. The optimal value of SE that maximizes the EE is obtained analytically, and confirmed by numerical results. Moreover, the influence of receiver correlation is also evaluated and it is shown that considering a non-realistic PCM can lead to mistakes when comparing TAS and MIMO