An analysis of short haul airline operating costs

The demand and supply characteristics of short haul air transportation systems are investigated in terms of airline operating costs. Direct, indirect, and ground handling costs are included. Supply models of short haul air transportation systems are constructed

Studies in the demand for short haul air transportation

Demand is analyzed in a short haul air transportation corridor. Emphasis is placed on traveler selection from available routes. Model formulations, estimation techniques, and traffic data handling are included

Some results on singular value inequalities of compact operators in Hilbert space

We prove several singular value inequalities for sum and product of compact operators in Hilbert space. Some of our results generalize the previous inequalities for operators. Also, applications of some inequalities are given.Comment: 1

Some inequalities associated with the Hermite-Hadamard inequalities for operator h-convex functions

We introduce the concept of operator h-convex functions for positive linear maps, and prove some Hermite-Hadamard type inequalities for these functions. As applications, we obtain several trace inequalities for operators

Perfect transfer of m-qubit GHZ states

By using some techniques such as spectral distribution and stratification associated with the graphs, employed in [1,2] for the purpose of Perfect state transfer (PST) of a single qubit over antipodes of distance-regular spin networks and PST of a $d$-level quantum state over antipodes of pseudo-distance regular networks, PST of an m-qubit GHZ state is investigated. To do so, we employ the particular distance-regular networks (called Johnson networks) J(2m,m) to transfer an m-qubit GHZ state initially prepared in an arbitrary node of the network (called the reference node) to the corresponding antipode, perfectly. Keywords: Perfect state transferenc, GHZ states, Johnson network, Stratification, Spectral distribution PACs Index: 01.55.+b, 02.10.YnComment: 17 page

Comparing the therapeutic effect of local corticosteroid injections and laser in treating coccyx pains (sacrum)

Coccydynia (pain in the coccyx or tailbone) is a fairly common pain in the bottom of backbone that spreads towards sacrum and lower legs. Supportive treatments, such as corticosteroids, use of muscle relaxants and correction of body position can help relieve the pain. In recent years, the use of laser is introduced as an effective method to reduce backbone pain. The purpose of this study is to compare the effects of corticosteroids and laser in treating tailbone pains. 61 patients with tailbone pain referred to the orthopedic clinic of Rasul Akram Hospital were entered into the study and randomly divided into two groups of laser and local corticosteroid injection. The mean difference in pain score was compared in both groups at the beginning of the study, end of the second week and end of the second month to determine the response to treatment. Data were analyzed using SPSS software. Of the patients enrolled, 24 were males (37.6) and 37 were females. The mean age of subjects studied was 36.16 years old. The mean difference in pain scores at the beginning of the study and at the end of the second month in the group treated by laser and corticosteroid was 2.54 and 3.8, respectively, that this difference was also statistically significant (P: 0.019) Effect of corticosteroid injection for pain relief was better than laser. The study should be done in a longer timeframe

Genetic characterization of Vimba vimba persa (Pallas, 1814) in southern parts of the Caspian Sea using microsatellite markers

Population genetic structure of Vimba vimba persa was investigated using microsatellite markers from 40 regions along the Iranian coastline of the Southern Caspian Sea (Anzali lagoon and Havigh River in Gilan province, BabolRoud River in Mazandaran province and GorganRoud River in Golestan province). Genomic DNA from 121 specimens was extracted from fin tissue by the Phenol-Chlorophorm method and PCR reaction was accomplished with 17 microsatellite primers, out of 17 microsatellite primers 13 loci were amplified, in which 10 of them were amplified with reasonable polymorphism and 3 were monomorphism. A total of 302 alleles were identified on average 7.55. Observed and expected heterozygosity averages were 0.80 and 0.77 respectively. Most cases significantly deviated from Hardy-Weinberg equilibrium (p≤0.01). The estimation of Fst (p≤0.01) revealed significant population structuring and an estimation of the four population of Vimba vimba persa was identified in the Caspian Sea in which restocking of these species should be considered

Statistical Investigation of the Effect of Major Parameters of False Twist Texturing on the Dyeing Characteristic and Color Properties of Microfilament Polyester Yarn

Microfilament polyester yarns are one of the most important and widely used yarns in the textile industry and the fabrics produced from these yarns have a large consumption. One of the most important issues regarding fabrics made from Microfilament yarns is the issue of dyeing and dyeing properties of these fabrics. Among the concerns of DTY polyester yarn manufacturers are the conditions for producing and texturizing these fibers. Choosing the right range for each of the effective parameters in the false twist texturing machines will play a major role in the physical properties, dyeing Characteristic and color properties of the yarn produced. In this paper, we attempt to study the effect of the most important texturing parameters by false twist method: first heater temperature, draw ratio, D/Y rate and texturing speed on some of the most important color properties of microfilament polyester yarn that dyeing with dispersant dyestuff. These properties include color reflectance (% R), color strength (K/S), amount of dye absorbed ( ) and absorbance number (A). Experiments are designed using ANOVA and Response Surface Methodology (RSM) method. The effect of changes in the main texturing parameters on the color coordinates of the microfilament polyester yarn is studied. The POY yarn used in this study is polyester yarn with a count of 135 dtex and 144 filaments. According to the studies, the interaction between the first heater temperature and the D / Y rate as well as the interaction between the draw ratio and the D / Y rate will have the greatest effect on the color strength and color properties of the microfilament polyester yarn

Gastrointestinal microflora of captured stellate sturgeon (Acipenser stellatus, Pallas, 1771) from Southeast Caspian Sea, Iran

Acipenser stellatus is one of the most invaluable species of Sturgeon fishes in the world. The purpose of this study was to identify the resident microbial community from the gastrointestinal tract (GIT) of Acipenser stellatus. One hundred and twenty three fungi were isolated from the GIT of 7 Acipenser stellatus samples including Aspergillus spp (45.5%), Trichoderma spp (8.9%) and Cladophialophora spp (8.1%). Among different Aspergillus isolates, A. niger was the predominant species. Although, fungi were predominantly isolated from stomach (36.6%), but with respect to frequency of fungal isolates there were no significant differences between stomach and other parts of GI. In general, the bacterial isolates recovered were mostly gram negative and related to Enterobacteriaceae family such as Aeromonas, Pseudomonas and Salmonella species. The most bacterial species were isolated from intestine and pre stomach region (88.2%). It is concluded that A. niger and Aeromonas species were predominant fugal and bacterial microbes isolated from understudy fish GIT, respectively