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A bench scale aerobic sequencing batch reactor (SBR) was evaluated in terms of its potential to treat synthetic dairy wastewater. The 2-l plexiglass bioreactor was supplied with oxygen via a fine bubble air diffuser, fed with synthetic dairy wastewater under various operational conditions. To analyze the process, three significant independent variables — influent chemical oxygen demand (COD), mixed liquor volatile suspended solids (MLVSS), and aeration time — were assessed. Three dependent process and quality parameters (as process responses) were also evaluated: total COD removal efficiency, sludge volume index (SVI) and final pH. The experiments were based on a central composite design (CCD) and analyzed using response surface methodology (RSM). The treatment was limited to the following concentration regimes: COD (1000, 3000 and 5000 mg/l), MLVSS (3000, 5000 and 7000 mg/l) and aeration time (2, 10 and 18 h). Maximum COD removal efficiency (of 96.5%) was obtained for an influent with the following characteristics: CODin: 3000 mg/l, MLVSS 5000 mg/l, and aeration time of 18 h. The study demonstrated the capability of aerobic SBRs for high COD removal from dairy industrial wastewater. Easy operation, low cost, and minimal sludge bulking condition were some of advantages of the SBR system as an option for biological treatment of medium-strength industrial wastewater. The present study provides valuable information about relationships between quality and process parameters for different values of operating variables.

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Soil compaction has become a widespread problem in the world and it is considered as one of the main factors affecting land degradation in arid and semi-arid agricultural land. The aim of this study was to investigate the effects of soil compaction on soil carbon and nitrogen sequestration, physical (aggregate stability, saturated soil moisture content, bulk density, and porosity) and chemical (EC, pH, organic carbon and nitrogen) features. The treatments were applied in the form of the completely randomized block design with four independent variables and three replicates. The study treatments included: control treatment (no artificial compaction), T₂ (2 times passing heavy tractor), T₃ (4 times passing heavy tractor) and T₄ (6 times passing heavy tractor). Toward this attempt, data was analyzed by means of the SPSS 16.0. Software package. The type of mean comparison method applied is the LSD test (at significant level of 5%). The results showed that different levels of soil compaction caused a significant effect on soil physical and chemical features. Based on the results, 6 times passing heavy tractor significantly reduced soil porosity and aggregate stability (respectively from 0.45% and 5.32 mm in control treatment to 0.255% and 3.88 mm) while this treatment (4) significantly increased soil bulk density as compared to other treatments(from 1.45 g cm^-3 in the control to 1.97 g cm^-3). Four and six times to-and-fro passing heavy tractor caused a significant reduction in soil carbon and nitrogen sequestration respectively from 3.26 t ha^-1 and 149.62 kg ha^-1 (in control) to 1.70 ton ha^-1 and 48.16 kg ha^-1for T₃ and T₄ treatments, but significantly increased EC in comparison with other treatments (changed from 0.58dS m^-1 in control treatment to 0.83dS m^-1 in T₄). Also, all soil compaction treatments significantly increased soil pH. For example pH increased from 7.93 in control to 8.09 inT₄. While soil compaction treatments resulted in significant decrease in organic carbon, total nitrogen and saturated soil moisture values.

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The present article critically discusses about the relation of theory and experimentation. This text is based on rational reasoning. The problem is that dominantmethodology on the relation oftheoryandexperimentationisbasedAristotelian logic in which experimentation has Context of Discovery or context of justification. In Iran, positivism and it’s relation with critical rationalism are misunderstood. This paper attempts to solve this kind of methodological issues through critical discussion. First, we discussed about epistemic apparatuses of positivism and critical rationality. Then, after critical discussion about the two epistemic apparatuses, fuzzy methodology is formulated as result of criticism excised the intellectual traditions. In the end, positivism is discussed as a problem in Iran.

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Background: Klebsiella pneumoniae is a Gram-negative bacterium and a part of the natural microflora of gastrointestinal tract in human body. K. pneumoniae has been known as one of the most common cause of nosocomial infections and multi-drug resistance pathogen. The aims of this study was to examine the detection of antimicrobial susceptibility and genetic relatedness among K. pneumoniae strains isolated from hospitals in Borujerd in western Iran using Enterobacterial Repetitive Intergenic Consensus (ERIC)–PCR technique.
Materials and Methods: A total of 100 K. pneumoniae isolates were collected from Borujerd hospitals from April to September 2015. After detection and confirmation of K. pneumoniae isolates by conventional laboratory methods and differential tests, antibiotic susceptibility was detected by disk diffusion method. Also, genetic relatedness of 34 selected MDR K. pneumoniae isolates were investigated by ERIC - PCR technique.
Results: Antibiotic susceptibility testing showed that among K. pneumoniae isolates, the highest antibiotic resistance was observed in ampicillin (91%) and the highest susceptibility was detected in imipenem (5.5%). More than 45% of isolates showed multi resistant phenotypes. Based on ERIC-PCR results, 31 different ERIC types were detected.
Conclusion: The results of this study indicate the increase of multi resistance K. pneumoniae in hospitals under study. The results of ERIC PCR showed high genetic diversity among K. pneumoniae strains, which indicated the poly clonal distribution of K. pneumoniae isolates in Borujerd hospitals.

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Introduction
Spatial policy regarding flood risk management is a series of actions that are aimed at achieving a logical solution in reducing the damage caused by floods and reducing the spread of floods (Sinha et al., 2020). The impact of devastating floods on global lives and livelihoods is growing. Large-scale floods caused 104 billion US dollars in damages globally between 2000 and 2015 (United Nations Office for Disaster Risk Reduction, 2015). As the climate changes, populations increase, and demand for housing and infrastructure grows, now more than ever, society needs to manage its flood risk and adapt to climate change. For this reason, achieving a spatial and logical comprehensive policy in flood risk management in a way that is efficient and sustainable, in research, policies and practice, requires (related program in flood management, 2017). Accordingly, the issue raised here is that; among the mentioned indicators, which of them is more important in making the spatial policy of rural flood risk management more efficient? Based on this, the necessity of research in this direction is that the present research has first identified all the items related to the indicators. Then he examines the importance of each of them in order to be able to answer this research problem.
Methodology
The method of the present research is applied in terms of purpose and descriptive-analytical in terms of the nature of information gathering. The method of data collection in this research will be both library and field. In the first step, library studies related to the research title will be used to compile the research literature, background, and theoretical foundations of the research. In addition, in the second step, it is used in the field and quantitatively by using the questionnaire tool to check the hypotheses of the research. The statistical population of this research consists of experts in the field, including faculty members specializing in this field, graduates and doctoral students with the title of a related thesis, and people in charge of the field, for this purpose, 70 samples have been selected (explained in the table below). From their point of view, the related questionnaire has a favorable level of validity and reliability with Cronbach's alpha coefficient of 0.97, which shows a very favorable level. Finally, one-way ANOVA (F) statistical test was used to analyze the data obtained from the mentioned questionnaire for the items of each index and finally all the indices.
Result and discussion
According to the problem stated in the introduction, in order to examine the importance of various indicators in the spatial policy of rural flood risk management, to examine the status of each of the five indicators (environmental, economic, social-cultural, managerial-institutional) and physical (land use)) deals with spatial policy of rural flood risk management To be able to identify the various aspects of the importance of each of the indicators and finally respond to the problem according to the opinions of the sample community.
To determine the importance of each of the indicators on the spatial policy of rural flood risk management, we have used Duncan's post hoc test, and the output of this test is grouped into three spectrums. They are classified according to their importance. So that the environmental index is the least important with a value of 2.9484 in spectrum one along with the economic index with a value of 3.1056, but the economic index is due to its proximity to social-cultural indicators with a value of 3.2381 and managerial-institutional indicators. With the value of 3105.3, they are the same shade in the spectrum and these two indicators (social-cultural and managerial-institutional) are placed in the third spectrum because of their proximity to the importance of the physical index (land use) and the only index that is the individual is placed in a spectrum and group. It is the physical index (land use) which is placed in the third group with the value of 3.4186 and has the largest sub-set for alpha, which shows the greater importance of this index on the spatial policy of management. The flood risk for the villages located in the watershed of Gorgan River in Golestan province has been that the following graph, which is the output of Duncan's post hoc test, also indicates the same performance of the indicators that as can be seen, environmental indicators are the least important. In addition, after that, the social-cultural index is the least important, and then the economic index and then the administrative-institutional index play a more important role. Finally, the physical indicators (land use) are the most important. The category of significance level, which is stated below the three groups, shows the lack of significance within the groups because of the closeness of their performance within each of the three spectrums.
Conclusion
According to the investigations carried out in the present study in two steps, first, through the study of available sources, the effective indicators and items in the spatial policy of rural flood risk management have been identified. Based on this, 5 indicators and 120 items have been identified. In order to check the importance of each of them, according to the type of indicators, ANOVA test (one-way analysis of variance) was used, the results of which can be summarized as follows: in the inter-group and intra-group sections. It is possible to understand the level of output desirability according to the average of squares and the sum of squares But what is important and effective in the ANOVA test output table is the F test statistic and the significance level value, which the test statistic number is 6.229 and the significance level value is 99 percent, which shows the very high importance of the five indicators on politics. Spatial planning is rural flood risk management. Based on this, Duncan's test was used to determine the importance of each of the indicators separately, and the results show that the output of this test is that the indicators are grouped into three spectrums, the reason for this problem Three spectrums are categorized according to their importance, So that the environmental index is the least important with a value of 2.9484 in spectrum one along with the economic index with a value of 3.1056, but the economic index is due to its proximity to social-cultural indicators with a value of 3.2381 and managerial-institutional indicators. With the value of 3105.3, they are the same shade in the spectrum and these two indicators (social-cultural and managerial-institutional) are placed in the third spectrum because of their proximity to the importance of the physical index (land use) and the only index that is Separately, it is placed in a spectrum and group, it is the physical index (land use), which is placed in the third group with a value of 3.4186, and has the largest subset for alpha.This shows the greater importance of this index on the spatial policy of flood risk management for the villages located in the Gorgan River watershed of Golestan province, and the following graph, which is the output of Duncan's post hoc test, also indicates the same performance of the indicators. As it can be seen, the environmental indicators are the least important, then the socio-cultural index is the least important, and then the economic index and then the administrative-institutional index play a more important role. Finally, physical indicators (land use) have the most importance in the spatial policy of rural flood risk management.

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To be sure, that a program behaves correctly at runtime; the behavior of the program should be verified. Where the program source code is available, it is possible to extract the operational logic (i.e., behavior) of the program. But in this paper, programs are considered as black boxes, so no information is available about the operational logic of programs. However, some efforts are spent to learn inductively the operational logic of programs by executing them successfully (i.e., correctly) for many (i.e., > 1000) times and logging their system calls implicitly. Therefore, in the first phase, few mechanisms are developed to discover inductively the loops and branching points of a program using its log system calls. Then, the operational logic of the program is constructed in system call level abstraction by applying a novel method. In the second phase, any deviation of the program execution (in system call level abstraction) from its operational logic (in system call level abstraction) is detected, just like white box approaches. Two major applications for the proposed approach are suggested: (1) to make critical programs somehow, detect their misuses (i.e., buffer overflow attack) by themselves, and (2) to protect programs against their runtime faults. The effectiveness of the proposed approach is demonstrated by some experiments.

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In recent years, air separation using membranes has received much attention as a cost-effective technology for producing relatively pure streams of nitrogen and oxygen. The results of studies show that the design and fabrication of new polymers with the desired structure for the industrialization of polymer membrane technology in the field of oxygen separation from nitrogen is considered very important. The results obtained from various research works show that polymer membranes made on the basis of aromatic polyimides and PIMs due to high selectivity, suitable mechanical, thermal and chemical properties and also benefiting from different structures due to polymer substitutions are a suitable option for separation of oxygen and nitrogen. Moreover, the membrane modification process can greatly increase the mechanical, chemical and selectivity of the membranes and be an effective way to improve the separation of oxygen from nitrogen. The results indicate that the fabrication of blended membranes has increased the selectivity and permeability of the membranes, and the creation of transverse connections in most cases has increased the selectivity of the membranes. Meanwhile, carbon molecular sieve membranes that are made by thermal decomposition of the polymeric raw material under controlled temperature and pressure conditions due to their properties such as high selectivity and permeability, stability in corrosive environments and applicability at high temperatures are suitable options for separation of oxygen and nitrogen. Also, carefully in the results obtained from various research works, it can be seen that the use of driving force and magnetic particles in the polymer simultaneously improves the permeability and selectivity of membranes. As it is predicted, this method is one of the efficient methods in improving the performance of polymer membranes in the field of oxygen and nitrogen separation.

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This article analyzes the rate of electoral participation during ten periods of presidential election in Iran within 1979-2009. The rate of electoral participation in Iran’s presidential elections has been problematic and not based on a regular pattern of change. Having proved this claim, the theory of democratic political system was chosen as the theoretical foundation of the paper in order to find a solution to the problem. The problem was related logically to the theory and inspired by the theory, the research question was formulated. On the theoretical level, it was argued that there is a relationship between party competition and electoral participation such that by an increase in the extent of party competition, the electoral participation will also increase. This argument was put through a regression analysis. Available evidence indicates that there exists a 45% positive correlation between electoral participation and party competition.  

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Tehran province experienced one of the severest drought status during 1998 to 2000. This drought can be assessed by drought indices. Drought indices are quantitative expression of this disaster that make its spatial and temporal evaluations possible. In this research work three indices including EDI, SPI and DI have been used to develop monthly drought maps for the aforementioned period, using the information of 43 meteorological stations and geographical information system (GIS). The results show that DI has very exaggerated responses to rainfall, especially to the summer rainfall. Also SPI is not responsive enough to rainfall deficiencies. Morover, it frequently detected normal situation for this period. But, EDI is able to response properly and shows good temporal and spatial consistency in drought detection.

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Background: Gastroenteritis is the second leading cause of death worldwide, with a high prevalence in children. Among pathogenic microorganisms, viruses are one of the main causes of this disease. Thus, the aim of this research was to investigate the prevalence of diarrhea caused by human adenovirus (HAdV), Epstein-Barr virus (EBV), and cytomegalovirus (CMV) in children with hematological diseases for the first time in Iran.
Materials & Methods: This study was conducted on 120 stool samples stored in the clinical sample bank of the Cellular and Molecular Research Center of Qom University of Medical Sciences. These samples were obtained from immunocompromised children with gastrointestinal symptoms, who referred to one of the children's hospitals in Qom during 2018 to 2019. Genomes were extracted from the stool samples and evaluated using the polymerase chain reaction (PCR) method.
Findings: The prevalence of HAdV and EBV was reported in seven (5.8%) and one (0.8%) cases, respectively, and CMV was detected in none of the samples. No cases of co-infection were observed.
Conclusion: This study results show that there are diarrhea-causing viruses among patients in the study area. Fortunately, the prevalence of these infectious agents in patients with underlying conditions was relatively low. However, monitoring of these viruses in the feces of all patients, especially immunocompromised patients, is recommended.
 

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This paper, using an economic analysis of crime, focuses on the relationship between crime and income inequality in Iran. The results indicate that there is a significant relationship between crime and income inequality in Iran. This means that by increasing income inequality in Iran the robbery as a crime will increase as well. In addition the findings reveal that there is a direct relationship between robbery and the proportion of people in urban areas, divorce and unemployment rate, but there is a negative relationship for households’ monthly income in Iran.

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Commercialization of technology is one of the importants element of innovation process and there are several difficulties to do that. Evaluating and pricing of know –how is one of the most complicated activities in commercialization process. The complexity of technology and know-how pricing has caused difficulties for research technology institutes (RTIs) leading them to use heuristic method for pricing. On the other hand, they are eager to use scientific methods for pricing in commercialization process. In this paper, a model was developed to systematically evaluate know-how and then to price the technology based on experience and heuristics method. Then the model was tested with the real cases in the Research Institute of Petroleum Industry (RIPI)(Iran).

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Yellow rust of wheat caused by Puccinia striiformis f. sp. tritici is one of the most important wheat diseases that threaten its production. Host resistance is the most economical and healthiest method of yellow rust management. In this study, slow rusting resistance parameters including infection coefficient, disease severity as well as reaction type were recorded for 48 rain-fed wheat genotypes along with sensitive control in 6 rain-fed environments. The field experiment was done for two consecutive years in three distinct geographical regions including Ardebil, Zarghan, and Mashhad. The additional screening test was established in greenhouse conditions. Results showed genetic variability among studied germplasms in resistance against yellow rust. In this research, G1, G04, G05, G06, G20, G21, G32, G33, G39, and G45 out of the studied genotypes had resistant and stable reactions across years and locations. Ward clustering algorithm produced three heterotic groups which can be utilized in yellow rust breeding programs through parental selection for the construction of a yellow rust mapping population. Differential genotypes testing resulted in “6E142A +, Yr27”, “38E158A +, YR27” and “134E150A +, YR27” isolates which belonged to Ardebil, Mashhad as well as Zarghan regions respectively. The resistance reaction in the seedling stage varied from that found in the field state which indicated the existence of adult plant resistance genes in their genome.

 

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Molecular dynamics simulations have been performed to study the mechanical properties of hydrogen functionalized graphene. We find out that Young’s modulus and tensile strength of pristine graphene are in good agreement with experimental results. It is shown that hydrogen functionalization can considerably modify the mechanical properties of graphene. It is also found that the patterned orrandom hydrogen coverage have different effects on the mechanical properties of graphene. Using molecular dynamics simulation, we study the mechanical properties of hydrogen functionalized graphene under tension and shear deformations at constant room temperature. Young’s modulus and shear modulus, tensile and shear strengths and tensile and shear fracture strains are mechanical parameters that are calculated in order to investigate the mechanical properties of hydrogen functionalized graphene. Results show that in some cases, hydrogen coverage pattern is important independent of its coverage percentage. The underlying mechanisms were explained considering the difference between sp^2 and sp^3 hybridization.

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In this study, the results of a direct numerical simulation (DNS) of turbulent drag reduction by microfibers in a plane channel flow at a shear Reynolds number of Re = 950 are reported. For this purpose, we make use of a numerical solution of three-dimensional, time-dependent Navier-Stokes equations for the incompressible turbulent flow of a non-Newtonian fluid. The non-Newtonian stress tensor which is required to solve the problem depends on the orientation distribution of the suspended fibers, which is computed by a recently-proposed algebraic closure model. It is shown that the use of this algebraic closure, due to the great reduction in computational efforts, enables us to perform a DNS at high Reynolds numbers. Ultimately, statistical quantities of turbulence (in particular, the mean velocity profile, Reynolds stresses, etc.) are presented and discussed. Variations in the isotropy of the Reynolds stress tensor are explained by the aid of Lumley anisotropy map.

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Objective: As we are approaching the global eradication of wild poliovirus, laboratory surveillance of poliovirus by the gold standard cell culture method becomes increasingly important. As there is a lot of concern about accurate and sensitive detection of imported wild and Vaccine Derived Polioviruses (VDPVs) in Polio-Free countries, in this study we assessed and compared the sensitivity of the cell lines used in polio laboratory simultaneously to standard poliovirus and Oral Polio Vaccine (OPV) polioviruses, to ensure the accurate detection of circulating and imported polioviruses in the society. Materials and Methods: Cell sensitivity test was performed according to the World Health Organization (WHO), Polio Laboratory Manual for RD, L20B and Hep2 cell lines using 3 serotypes of standard monovalent and OPV polioviruses. The test was repeated every four passages for all cell lines. Results: The sensitivity of L20B and Hep2 cell lines for standard poliovirus type 1 and 2 is more than sensitivity for the same types of OPV virus but for poliovirus type 3 it is vice versa. Also RD cell line is more sensitive to all 3 types of OPV virus. In addition, the test showed that increasing the passage number will decrease the sensitivity of all cell lines. Conclusion: Using RD & L20B cell lines simultaneously (with low passage number) will assure us of sensitivity and accuracy of the cell lines for detection of circulating and imported polioviruses.

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In order to provide the data needed for the design of saffron processing equipment, physical properties of its flower were investigated. These properties included dimensions, mass, true and bulk densities, porosity, static and dynamic coefficients of friction, and terminal velocity as a function of moisture content. The average range of these properties for the three different parts of saffron flower was about 0.03 to 0.16 gcm-3 for bulk density, 0.55 to 1.56 gcm-3 for true density, and 85.2 to 95.5% for porosity. Also, the coefficients of friction were measured for three flower parts by using three surface materials including plywood, iron, and galvanized steel sheets. The minimum and the maximum values of static coefficients of friction were found on galvanized steel sheet. They were 0.8 and 2.14 for anther and stigma, respectively. The dynamic coefficient of friction ranged from 0.45 for anther on iron to 1.14 for petal on galvanized steel sheet. The variation range of terminal velocity for three different parts of the flower was recorded between 0.9 and 2.38 ms-1. The results of friction coefficients and terminal velocity measurements suggest that, based on these properties, design of a separator for saffron flower parts is feasible.

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In this study, a new method for producing initial conditions that are required for the Brownian dynamics simulation of dilute polymer suspension flows is proposed. For this purpose, the equilibrium probability distribution function is employed to generate an equilibrium ensemble of polymers. This approach is programmed and by using it, a polymer suspension in the inception of a simple shear flow is simulated. Also, the results of simulations in a similar flow configuration based on the conventional approach of generating initial conditions are presented. The excellent agreement between the results demonstrates the high accuracy of the proposed method for generating initial conditions. The main advantage of the proposed method is its low computational cost.

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In this paper the effect of pressure ratios on the performance characteristics of a radial twin entry turbine is investigated using computer aided design (CAD) and computational fluid dynamics (CFD). First, geometric models of the turbine flow passages are constructed by simultaneous use of measuring tools and computer aided design software. Because of geometrical complexity of flow passages, tetrahedral cells are used to generate unstructured grid in the computational domain. Three dimensional flow of steady, viscous, and compressible nature is solved by Multiple Reference Frame (MRF) technique. Characteristic curves of the turbine are obtained by post processing flow simulation results. Mass flow parameter, delivered torque parameter and total to static turbine efficiency are plotted against different pressure ratios. Results show that at constant rotational speed, increasing pressure ratio leads to increase in mass flow parameter until choke limit while the total to static efficiency decreases and delivered torque increases.

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In this study, using the results of a DNS of drag-reduced turbulent channel flow, vortical flow structures especially in the near-wall region are investigated. For this purpose, a Lagrangian Monte-Carlo method has been used to simulate the spatial orientation of fibers. Namely, the flow field is treated in an Eulerian manner whereas the fiber dynamics is described by a Lagrangian point of view. This method yields the exact solution of the governing equations. Vorticity fluctuations in the channel are studied and it turns out that the level of these fluctuations decreases in the drag-reduced flow. The reason for this reduction is explained using the reduction in velocity gradient fluctuations. Also, the distribution of the angle between the vorticity axis and the wall is studied and it turns out that horseshoe vortices exist in both flows. However, in the drag-reduced flow, they are formed farther away from the wall which indicates a weakening of sweep and ejection mechanism in the vicinity of the wall. This weakening leads to drag reduction. Also, the orientation of vortices in the drag-reduced flow is well ordered.