h. hosseinzadeh

Considering the consumption of more than 25% of energy by raw mill materials in cement plants, providing a suitable plan for blending different mining zones can be an effective approach in reducing the energy consumption. The purpose of this paper is optimizing the plan of blending limestone mining zones to reduce milling energy consumption raw mills (ball mill and HPGR). The geomechanical properties of different mine zones have been identified by performing the bond work index, drop weight, and uniaxial compressive strength (UCS) tests. Also, to comply with cement production standards, cementing modules including S.I.M, A.L.M, and L.S.F have been calculated for different mine zones. Mining production planning with the aim of achieving the minimum comminution energy and transportation costs has been developed by the Goal programming method. Planning constraint equations are also considered to regulate cement modules. Finally, utilizing windows Quantitative System for Business software, the necessary calculations have been carried out. Based on the results, the extraction order and blending values of different mine zones are adjusted regarding cement modules and minimizing transportation costs, leading to a reduction in energy consumption of raw mills.

The purpose of this paper is to present some $n$-tuple fixed point and $n$-tuple coincidence point results in $C*$-algebra-valued metric spaces using the concept of an $\alpha$-series applied to a series of mappings. At the end of the paper, we give an example and an application to support our main results.

Marine nematodes are the most important sediment living invertebrates. Free living nematodes are considered as bio indicators in coastal areas. Many pollutants such as polychlorinated biphenyls may affect their physiological process. The present study is conducted to describe physiological and histological pattern of marine nematode (Oncholaimus campylocercoides) from north Persian Gulf. Three locations with different concentrations of PCBs were selected in Bandar Abbas for sampling. Sex steroid hormones (progesterone, testosterone and 17-B estradiol) were analysed after separation and purification of marine nematodes from sediments. Moreover, fine structures of ovocyte and spermatozoa were studied after histological observation. Results showed that sex ratios were F(1): M(0.97), F(1): M (0.9), F(1): M(0.5) in locations with 0.01, 0.02 and 0.1 µg/mL tissue PCB concentrations, respectively. Level of 17 β-estradiol (1.2±0.07pg/mL) in females at the location with 0.1 µg/mL PCB (power plant) was significantly higher than that in other two sampling locations. Also high level of testosterone (0.4±0.07 pg/mL) was observed in males and females at the polluted sampling site compared with that in other two locations. Histological study showed that in the location with high PCBs, there was an obvious increase in size of oocytes. We concluded that PCBs can affect sex steroid changes as endocride disruptors in Oncholaimus campylocercoides. Results of this study supported findings of previous studies on PCB endocrine disrupting roles in marine organisms.

A new and attractive metric space is a P-metric space which is a generalization of the concept of b-metric spaces. The generalization of the principle of Banach contraction has been carried out by many authors. Generalizations focus on the extension of metric spaces and the extension of contraction conditions. A few metrics, such as partial metrics, G-metrics, 2-metrics and Branciari metrics are some examples of metrics provided in this field. The aim of this paper is to present some common fixed point results for two mappings (one of them is weakly isotone increasing with respect to another) in the framework of ordered $p$-metric spaces. Our results are generalizations of the presented results in [H. K. Nashine, B. Samet and C. Vetro, Math. Comput. Modelling, 54 (2011) 712–720] and [ J.R. Roshana, V. Parvaneh and Z. Kadelburg, J.Nonlinear Sci. Appl., 7 (2014), 229--245]. An example is also provided to support our results.

Understanding the nurse’s perception of care behaviors and determining factors affecting it are the first step in correcting inappropriate behaviors and improving the quality of nursing care. Therefore, this study was conducted with the aim of "determining the care behaviors and its determinants from nurses' point of view in Ardabil educational hospitals ".

This was a descriptive cross-sectional study with 450 nurses working in Ardabil educational hospitals in 2017 in which the stratified random sampling method was used. Data-gathering tool was a standard three-part questionnaire on demographic characteristics, Wolf caring behaviors and the determinants of nursing care behaviors. Data were analyzed using descriptive (mean and standard deviation) and analytical (Mann-Whitney, Kruskal-Wallis, ANOVA and Multivariate Regression Analysis) statistics in SPSS V21 software.

The mean and standard deviation of nurses' caring behaviors (5.27±0.24) were at the optimum level. From nurses' point of view, physical dimension of care (5.43±0.7) was more important than psychosocial dimension (5.17±0.6) (p=0.001). The most and the least important caring behaviors for nurses were medication (5.58±0.44) and patient's calling with her favorite name (4.20±0.86), respectively. Mean scores of caring behaviors in female nurses (5.26±0.7) were more than males (4.97±0.54) (p=0.001). The most important factor influencing nurses' caring behaviors was the responsibility (4.49±1.01) and the least important factor was related to patient's characteristics (3.50±1.1).

The results showed that nurses' care behaviors were in the desired level and focused on the physical aspect of care. Therefore, in order to provide patient satisfaction, nurses should pay attention to both dimensions of caring behaviors (physical and psychosocial). It is suggested that psychosocial care should be emphasized in nursing in-service training.

In this study the effect of different protein levels on reproductive performance of Channa striatus was conducted. Snakehead juveniles (65.5±0.2 g) were randomly distributed into nine homogenous groups of 75 fish each. Three isocaloric experimental diets differing in protein levels were prepared. The experiment lasted for 8 months and gonadosomatic index, absolute fecundity, egg diameter, number of mature oocytes, hatching rate, larval length, survival rate and amino acid and proximate composition of tissue, liver and ovary were monitored. Growth, gonadosomatic index (GSI) and absolute fecundity increased with increase in protein level. Protein and lipid content of ovary was highest in fish fed 450 g kg-1 protein. The percentage of mature oocyte, egg diameter, hatching rate and larval length were the highest in the group fed 450 g kg-1 protein.  There was no significant difference between the amino acid profiles of muscle tissue in all treatments. Amino acid profile in the liver showed that isoleucine, leusine, phenylalanine and tyrosine were significantly higher in fish fed the 450 g kg -1 protein diet.

Solvent sublation is one of the non-foaming adsorptive bubble separation techniques for the removal of hydrophobic compounds from dilute aqueous solutions, in which surface-active compounds are adsorbed on the surface of rising bubbles and then are extracted into an immiscible organic layer placed on the top of the aqueous phase. This paper aims to review mass transport mechanisms, proposed mathematical models and theeffects of some important parameters on the performance of this process. At the end, a number of conducted studies have been mentioned briefly in the removal of organic compounds and also preconcentration of trace metal ions in aqueous solutions.

Oxytetracycline (OTC) is the only form of tetracycline compounds which is approved by FDA to be used for prevention and treatment of aquatic animals’ diseases. The aim of this study was to determine the amount of OTC residue in muscle and liver of Common carp (Cyprinus carpio) by high performance liquid chromatography (HPLC) using single dose method. 12 fishes were divided into 4 treatments and each treatment was divided into 3 replicates. Regarding the weight range of fishes   ( 40-80 g ) and also the injectable OTC dosage rate of  25-50 mg/kg in accordance with aquatic animals pharmaceuticals ,0.04 ml of injectable solution of OTC was intramuscularly injected, then muscle and liver were sampled from fishes after 6, 24, 48 and 72 hours. Measurement of OTC residues was carried out by HPLC after solid phase extraction (SPE). The highest recorded concentrations in muscle and liver were observed in 6hr and 24hr after injection respectively (3.37μg/g and 17.37μg/g). The lowest concentrations in muscle and liver belonged to 72hr after injection (0.29μg/g and 9.52μg/g respectively). The results indicated that OTC concentrations descend in muscle from 6th to 72th hour. But in liver, because of OTC redistribution, drug concentration increases significantly after 24hr (P<0.05), then it decreases after 48 and 72hr.