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Search Results: 1 - 10 of 30999 matches for " Z. Changiz-Dalivand "
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Effect of Azolla Compost and Nitrogen on Yield and Components Yield Rice (Oryza sativa) in North of Iran
Z. Changiz-Dalivand,M. Ashouri,T. Razavipur
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2012.255.259
Abstract: In order to assess the effect of Azolla compost and Nitrogen on yield and yield component of Oryza sativa, an experiment in factorial format based on randomized complete block design with 3 replications in Iran s Rice Research Institute (Rasht township) in 2011 was conducted. Experiment factors include chemical fertilizer on 3 levels (control, 40 and 80 kg ha-1 nitrogen) and organic fertilizer on 4 levels (control, 2.5, 5 and 7.5 ton ha-1 Azolla compost) based on dry weight. Results indicated that using of Nitrogen fertilizer and Azolla compost rate had a significant effect on the grain yield, thousand grains weight, plant height, number of panicle and number of tiller. Also in this experiment determined that interaction effects of Nitrogen fertilizer and Azolla compost is significant only on the number tiller.
Investigating Outsourcing Implementation in Iranian Organizations
Changiz Valmohammadi
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: The aim of this study is threefold, first to explore the extent of outsourcing implementation in Iranian organizations, second, given contextual factors of the country to identify drivers and barriers of outsourcing implementation among the investigated organizations and thirdly, to survey if there is any relationship between outsourcing functions and organizational performance of Iranian organizations, mainly based on a descriptive analysis. Based on the review of literature 16 main functions and activities which are widely outsourced and drivers and barriers of outsourcing implementation were identified. A questionnaire was designed and distributed among Iranian organizations. Based on 197 returned questionnaires the extent of outsourcing for various functions in the surveyed organizations was determined. Results indicate that most of the sample organizations realize the importance and the role of outsourcing strategy in gaining and increasing competitiveness and competitive advantage over their competition which could hopefully lead to the increase of their profitability. However, the result of the chi-square test cannot confirm that the implementation of outsourcing is significantly related to greater company success in Iranian industries context.
Investigation and Assessment of Critical Success Factors of Knowledge Management Implementation in Iranian Small-to-Medium Sized Enterprises
Changiz Valmohammadi
Journal of Applied Sciences , 2010,
Abstract: Based on an in-depth review and comparative study of existing studies on Critical Success Factors (CSFs) of Knowledge Management (KM) and by considering the characteristics of small to medium sized enterprises (SMEs), twelve CSFs were identified, namely management leadership and support, organizational culture, information systems, KM strategy, performance measurement, organizational infrastructure, processes and activities, rewarding and motivation, training and education, removal of resources constraints, human resources management and benchmarking which is believed to be suitable for SMEs. The importance of the proposed CSFs was theoretically discussed and justified. An instrument, which consists of all CSFs and their related elements, was developed to evaluate the appropriateness of the proposed CSFs from experts’ point of view. The experts were asked to express their views and perceptions on the extent of appropriateness of the CSFs and their related elements for Iranian SMEs using a six-point Likert scale, ranging from not successful to extremely successful. This scale was then grouped into three levels-poor, satisfactory and good. The overall results from this assessment show that experts endorsed the proposed CSFs and their related elements as being at least eighty percent satisfactory for their intended purpose. The set of CSFs can act as a list of items for organizations, particularly for SMEs to address when implementing KM. This helps to ensure that essential issues and factors are covered when planning and developing KM. Also, it can provide a basis for them to evaluate their KM practices. For academics; it provides a common language for the discussion and study of factors underpinning the success of KM in SMEs.
A Novel Ultra-Wideband Monopole Antenna with Band-Stop Characteristic  [PDF]
Hadi Jalali Lak, Changiz Ghobadi, Javad Nourinia
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.24032
Abstract: In this letter, a simple monopole antenna with variable band-notched characteristic for ultra wide band (UWB) function is proposed. Two L-shaped quarter-waveguide resonators coupled to the ground plane with two shorting tracks at the sides of the antenna are used to generate stop-band performance around 5.5 GHz (WLAN). The proposed antenna is fabricated on the substrate FR4 (relative permittivity of 4.7) and has a compact size of 16 × 28.5 × 1.6 mm. The designed antenna has a good impedance matching in 3.1 - 11.4 GHz frequency range with VSWR < 2, except the band 5 - 5.85 GHz.
Missed Pathology in Laparoscopic Cholecystectomy
Alireza Barband,Changiz Gholipour
Research Journal of Medical Sciences , 2012,
Abstract: The wide acceptance of Laparoscopic Cholecystectomy (LC) has result in increasing the rate of LC bears the possibility of concomitantly missing intraabdominal pathology. The prospective follow up of 1852 patients who underwent LC was studied and all patients treated and readmitted for intraabdominal malignancy included. Over the ten years, 1852 patients with symptomatic cholecystitis operated using LC. Six patients required readmission for missed pathology of another organ (three for Colonic cancer, one Appendix tumor, one Gastric carcinoma and one Pancreatic cancer). This indicates a risk of more missed pathology during the course of laparoscopic operation compared to standard laparotomy. Although, the incidence of missed malignant pathology has a very low doesn`t justify routine screening for cancer (colon cancer ) before LC in terms of cost-effectiveness, the risk of missing pathologies during laparoscopic procedures has to be minimized by placing additional emphasis on careful evaluation of pain and associated symptoms before performing LC.
Responsibility Attitudes in Obsessive-Compulsive Patients: The Contributions of Meta-Cognitive Beliefs and Worry
Changiz Rahimi,Mahbobeh Haghighi
Iranian Journal of Medical Sciences , 2010,
Abstract: Background: Obsessive patients are distressed by intrusivethoughts, which are related to unreal threats. These patientsfeel that they are responsible for harming themselves and others.While controlling worry and meta-cognitive beliefs, thepresent study aimed at comparing the responsibility attitudesin obsessive compulsive patients with those in normal subjectsto determine whether the difference in responsibility attitudesbetween two groups was significant.Methods: A group of 15 patients were compared with normalsubjects (n=15) who matched the patient group in terms ofgender, age and education. All subjects filled the ResponsibilityAttitude Scale, the Penn, State Worry Questionnaire andthe Meta-cognition Questionnaire -30. The findings were analyzedusing descriptive statistics as well as student t and ANCOVAtests.Results: Responsibility attitudes in obsessive patients weresignificantly higher than those in normal subjects (P<0.001),when patient worries and meta-cognitive beliefs were notcontrolled. However, after controlling patient's worry andmeta-cognitive beliefs there was no significant differencebetween responsibility attitudes in normal and obsessive–compulsive group.Conclusion: The findings might suggest that responsibilityattitude is not strongly related to obsessive-compulsive symptoms.It seems that it is a characteristic caused by basic metacognitivebeliefs, because the relationship between the responsibilityand the symptoms was dependent on meta-cognition.Therefore, in studying the etiology and treatment of obsessivecompulsive disorders focus on the responsibility attitudesalone cannot be very helpful.
Entropy and Graphs
Seyed Saeed Changiz Rezaei
Mathematics , 2013,
Abstract: The entropy of a graph is a functional depending both on the graph itself and on a probability distribution on its vertex set. This graph functional originated from the problem of source coding in information theory and was introduced by J. K\"{o}rner in 1973. Although the notion of graph entropy has its roots in information theory, it was proved to be closely related to some classical and frequently studied graph theoretic concepts. For example, it provides an equivalent definition for a graph to be perfect and it can also be applied to obtain lower bounds in graph covering problems. In this thesis, we review and investigate three equivalent definitions of graph entropy and its basic properties. Minimum entropy colouring of a graph was proposed by N. Alon in 1996. We study minimum entropy colouring and its relation to graph entropy. We also discuss the relationship between the entropy and the fractional chromatic number of a graph which was already established in the literature. A graph $G$ is called \emph{symmetric with respect to a functional $F_G(P)$} defined on the set of all the probability distributions on its vertex set if the distribution $P^*$ maximizing $F_G(P)$ is uniform on $V(G)$. Using the combinatorial definition of the entropy of a graph in terms of its vertex packing polytope and the relationship between the graph entropy and fractional chromatic number, we prove that vertex transitive graphs are symmetric with respect to graph entropy. Furthermore, we show that a bipartite graph is symmetric with respect to graph entropy if and only if it has a perfect matching. As a generalization of this result, we characterize some classes of symmetric perfect graphs with respect to graph entropy. Finally, we prove that the line graph of every bridgeless cubic graph is symmetric with respect to graph entropy.
A Novel Approach in RF-MEMS Switch Analysis Using Time Domain TLM Method  [PDF]
Alireza Haghshenas, Changiz Ghobadi, Javad Nourinia, Davod Ahmadian, Saber Soltani
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.310062
Abstract: In this paper the transmission line matrix (TLM) method is exploited to evaluate the electromagnetic field distribution over a new radio frequency micro electromechanical system (RF-MEMS). A hybrid symmetrical condensed node is used to analyze S-parameters of the switch in on and off states. Furthermore, the effects of spring zigzag cuts over the bridge are analyzed. Results have authorized that TLM method offers a much faster and more reliable results compare to other numerical methods because of its time domain behavior and transmission line basis.
Aperture Efficiency Study of Square Reflect Array Antennas  [PDF]
Javad Nourinia, Changiz Ghobadi, Bahman Mohammadi, Farzad Alizadeh
Wireless Engineering and Technology (WET) , 2018, DOI: 10.4236/wet.2018.93006
Abstract: This paper presents a detailed study of square reflect array (RA) antenna aperture efficiency (ηa). Effects of quantization-phase and limited phase-range errors on radiation pattern, half-power beam width (HPBW) and ηa for different feed locations are investigated. Results show an in-crease in side-lobe levels (SLLs) and a slightly reduction in ηa with quantization-phase augmentation or element phase-range reduction, however, the effects on HPBW are negligible. Nevertheless, the degradation in ηa is negligible when the quantization-phase is lower than 30° or phase-range is more than 300°. Parametric studies have been carried out to provide design guidelines to maximize ηa. It is perceived that the offset-angle plays an important role to determine ηa, especially for feed with narrow beam width.
Vertex-strength of fuzzy graphs
Changiz Eslahchi,B. N. Onagh
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/43614
Abstract: The fuzzy coloring of a fuzzy graph was defined by the authors in Eslahchi and Onagh (2004). In this paper we define the chromatic fuzzy sum and strength of fuzzy graph. Some properties of these concepts are studied. It is shown that there exists an upper (a lower) bound for the chromatic fuzzy sum of a fuzzy graph.
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