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Sound substitution is a process whereby a phoneme in a loanword is replaced by its closest phone in the borrowing language. Many English loanwords with consonants /T/, /w/, /k/ and /g/ have been adapted by Persian. None of these consonants exist as a phoneme in Persian. The pronunciation or substitution of these consonants by their closest phone in Persian depends on the phonological environment; the dental /T/ is replaced by [t] and [s] respectively in the onset and coda. The bilabial /w/ is replaced by [v] in the onset. However, since [w] is only used as an intervocalic consonant in Persian, it acts like an intervocalic consonant upon the declusterization of word initial /sw/. Therefore, it is not usually replaced by any consonant in this environment. Finally, the velar consonants /k/ and /g/ either change to palatal [c] and [Š] respectively or do not change at all, due to the phonological environment. This research aimed at explaining each of these sound substitution processes within the framework of optimality theory (Prince and Smolensky, 1993/2004). It presents arguments in favor of constraint rankings which cause the occurances of these processes.

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One of the important features of Hafez verses is their very solid structure and deliberate geometry.
In this structure words and constituants are selected so skillfully and are sitting with each others so deliberately that don’t accept modification and rarely comes forward that don't be injured from repair and change for better and displacement.
In this essay we discussed the structure, language structure and artistic structure and then tried to reveal the above mentioned particular feature of Hafez poems, by using and considering a number of samples and models of Hafez poems.
 

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Aftekhari.S.A.
Abstract:
 
Various theories have been proposed to explain the differences which exist between the language of Persian Medieval Prose and standard Persian as well as between standard Persian and colloquial Persian.     What everyone seems to agree on though is that changes in language are caused by a yet unknown and seemingly uncontrollable phenomenon .Today , the gap which exists between standard and colloquial Persian is so deep, that in the eventuality that amendments were deemed necessary, it would be impossible to implement them and bring back colloquial Persian closer back to its standard form.
A deeper and more precise understanding of colloquial language, assessing the role and functions of language economy and identifying and isolating the elements which cause changes in the form and content of languages are all factors which need to be studied and taken into account to help reduce errors in language planning process.
In this article, we explain and classify the inclinations of Persian speakers to shorten and simplify language components, a phenomenon known as language economy, which we believe, is the main factor influencing the development of colloquial Persian.
 

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In this paper, we show how to obtain suitable differential charactristics for block ciphers with neural networks. We represent the operations of a block cipher, regarding their differential characteristics, through a directed weighted graph. In this way, the problem of finding the best differential characteristic for a block cipher reduces to the problem of finding the minimum-weight multi-path way between two known nodes in the proposed graph. We applied Hopfield network to find the minimum-weight multi-path way. In this technique, the probability of convergence to a local minimum increases when the number of rounds of the cipher increases. We also applied Boltzmann machine to avoid local minima. We applied these techniques to find 3-round, 4-round and 5-round differential characteristics of Serpent block cipher, and repeated the optimization procedures for each characteristics 100 times. With Hopfield network, we obtained suitable results 100, 20 and 1 times for 3-round, 4-round and 5-round of the Serpent respectively. With Boltzmann machine, we obtained suitable results 100, 99 and 30 times for 3-round, 4-round and 5-round of the Serpent respectively. These results show that simulated annealing help avoiding the many local minima of energy function. We compare the probabilities of our obtained differential characteristics for Serpent with the probabilities of eight differential characteristics previously reported in other papers. The comparison shows that our proposed technique obtains better results in 6 cases, and the same results in 2 cases. We also found a 7-round differential characteristic with a probability of 2-125 with Boltzmann machine. Neglecting the reported Bommerang differential characteristics of Serpent, our obtained 7-round differential characteristic is the first report on a differential characteristic for more than 6 rounds of this cipher. The results of experiments indicate the efficiency of neural networks to find suitable differential characteristics of block ciphers.

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Growth indices (WG and SGR), food (FCR) and protein efficiency (PER and PCE) of fingerling Nile tilapia, Oreochromis niloticus,were evaluated in 3 synchronous examinations with 12 treatments in triplicates. Groups of control, canola meal (at rates of 25, 50, 75 and 100%), cottonseed meal (at rates of 15, 25, 35 and 45%), as the replacements of expensive protein sources (fish meal and soybean meal), and azolla (at rates of 13, 21 and 29% of diet) were studied. Growth indices, total food intake and protein intake of the control were the highest of all. They decreased with increase in plant protein in every group (p<0.05). FCR and protein efficiency indices didn’t show significant differences (p>0.05) between control and canola meal (at rates of 25 and 50%), cottonseed meal (at rates of 15, 25 and 35%) and azolla (at rates of 13 and 21%). Total food intake, protein consumption and growth indices decreased, because all plant protein ingredients were unpalatable. If the problem of palatability is solved, it seems that the expensive protein sources replace with canola meal and cottonseed meal at the rates of 50 and 35% respectively, and azolla can be used at the rate of 21% in diets. 

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Through descriptive-analytic method, and based upon the common patterns of translating the Proper Names (PNs), this paper investigates the translation resistance and, or the challenges the translators are exposed to, while translating some Glorious Divine Names, GDNs. Generally, GDNs is placed under the domain of PNs, about which some strategic models have been presented in translation studies (TS). This paper takes the Leppihalme's and Baker's models as its approaching method. Hence, it is followed by the detailed discussion of translations of the 11 GDNs taken from Sura Al-Hashr (59:23-24) as rendered by the nine well-known English translators. Having used different Qur'anic exegetical sources, the typical meanings of GDNs are extracted and compared side by side to answer this question that how and by which strategies the translators have rendered these GDNs. Finally, it deems that the nine translators have not been able to convey the colorful Qur'anic meanings of DNs. Prefereably, they have less employed the contextual and intertextual relations than the semantic strategies of translation, transliteration, literal translation, replacement, and substitution included, in translating these GDNs. In sum, the Glorious Divine Names show resistant to translation from Arabic into English.

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The Arab tribes inhabited throughout the Arabian Peninsula and had a sedentary life. Some of them were sedentary tribes while others were nomadic tribes seeking for water and food in the desert. Undoubtedly, the nomadic tribes who lived in the desert had their own way of pronouncing words, which were different from the way of sedentary tribes and had a great effect on the variety of Arabic accents and the characteristics of each one. Some pronunciations were included in the elements of the language of the tribe and in the lexical domain of the Holy Qur'an, and in a region the pronunciation of a word was with a letter which was other than the letter used in another region. In the framework of historical linguistics and in order to determine the role of culture and region in the phonemes of the Arabic language the goal of this study is to scrutinize the phonetic changes of Arabic language in the context of the Holy Qur'an according to Ibdāl which is a phonological process.
Research methodology is descriptive. First, we peruse the Arab motives to pronounce a letter in a different way. Then by assessing the human geography and Arabic language Tajweed, we try to find the origin of the phenomenon of Ibdāl, and thereafter, examine the phonetic system of Arabic language vowels that have same place of pronunciation or common characteristics. Then, we will study the phenomenon with regard to the former and latter letter. By giving examples of Ibdāl, we will understand the role and contribution of the tribes in such processes.
 

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Armington elasticity measures the degree of responsiveness of relative demand of an imported good to its domestically produced one, to relative home produced-imported price ratio of that good. In fact, it shows the competitiveness (or its substitutability) of domestically produced goods with respect to the imported ones. These elasticities were estimated for 23 selected goods (because of data deficiencies) at 2, 3 and 4 digits of ISIC classification and found them (for 19 goods) positive and statistically significant.

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Objective: Silicon is an effective element in bone biomineralization; hence Si-substituted hydroxyapatite can be a relevant bioceramic as bone materials substitution. Materials and Methods: Stoichiometric hydroxyapatite (HA) and Si-substituted hydroxyapatite (Si-HA) with different contents of Si substitution were synthesized successfully by a hydrothermal method using Ca(NO3)2, (NH4)3PO4 or (NH4)2HPO4 and Si(OCH2CH3)4 (TEOS) as starting materials. Results: Crystalline Phases, chemical composition, microstructure and morphology of synthesized powders were investigated using X-ray diffraction (XRD), Fourier transform IR spectroscopy (FTIR), inductively coupled plasma AES (ICP-AES) and scanning electron microscopy (SEM) techniques. The results proved silicon substitution in hydroxyapatite structure and revealed that the substitution of phosphate groups by silicate groups caused some OH- loss to maintain charge balance and the lattice parameters slightly changed with respect to stoichiometric HA. Conclusion: Si-incorporation reduces the crystallites size of Si-HA and crystallinity, thus the solubility of Si-HA powders increases, and as a result Si- substitution has improved bioactivity behavior of HA. Based on in-vitro tests; soaking and incubating the specimens in simulated body fluid (SBF) and MTT assays (Dimethylthiazol assay), Si-substituted hydroxyapatite is more bioactive than pure hydroxyapatite.

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Iran is one of the main date palm producers in the world. Date waste was increased, so research around using date products such as syrup, sugar and spread was increased. In this study sucrose replaced with date syrup in Kooshab and physicochemical, rheological and organoleptic properties were studied during 6 months. In this study, various levels of sucrose and date syrup were used for the production of Kooshab, and their effects on physicochemical and sensory properties were studied during 6 months. The SPSS₁₉ software was used for analysis of the data, the statistical test being the Duncan’s test. According to results during 6 months acidity and Brix were constant. Nonalcoholic Kooshab in which the date syrup was used generally have a significant difference (p<0.05) in reducing sugar, color and viscosity with control sample. Samples with 75%, 50% and 25% date syrup have significantly difference with control sample in total sugar, however there was no significant difference between sample with 100% date syrup and control sample. According to sensory results, beverage with 75% date syrup exhibited the highest overall acceptability. Beverages which date syrup used instead of sugar have a desirable characteristic and indicate that substitution of sugar by date syrup didn’t leave any undesirable effects.

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The labor income share is constant under the assumptions of a Cobb-Douglas production function and perfect competition. This paper modifies these assumptions, and investigates how to behave actually dynamic the labor income share within the Iranian manufacturing industries through estimating the elasticity of substitution between capital and labor and the price markup. This paper estimates such elasticity by using of a CES production function under perfect and imperfect competition in the product market. The degree of imperfect competition is measured following the Rojer approach. This dynamism in labor income share is explained by (1) a non-unitary elasticity of substitution between capital and labor; and (2) non-perfect competition in the product market. The results show that the elasticity of substitution is 0.75 under perfect competition without price markup, but it is 0.65 under imperfect competition with price markup. These mean that the elasticity of substitution decreases due to the presence of the price markup in imperfect competition regime, while labor income share increases highly by increase in capital intensity.  

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In recent years, the high cost of raising livestock and, consequently, the sharp increase in the price of red meat in Iran have reduced its demand, and people consume chicken meat as a substitute for it. This has reduced the production incentives and, with the bankruptcy of some beef cattle farms, the welfare of producers and consumers of this product face serious danger. To overcome this problem, understanding cost structure and reducing consumer price by reducing production costs seems necessary. Therefore, the aim of this research was to evaluate cost structure and economies of scale of beef cattle farms in Mashhad. For this purpose, the short-run Translog cost function along with input cost share equations were estimated using the iterated seemingly unrelated regression method. The data were collected in 2017 from beef cattle producers by interview using structured questionnaires. The result showed that there were increasing returns to scale for all farms. In addition, the demands for all inputs were perfectly inelastic. On the other hand, there was weak complementary and substitute relationship between inputs. According to the results of this research, the most important factor of beef production in the selected farms was feed, whose demand was inelastic and the possibility of substituting it with other inputs was very weak. Therefore, the adoption of policies by the government, including subsidies for feeding cattle and increasing the import of this input, can reduce the production cost and prevent beef prices from rising.
 

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Water is the most important input used in agriculture. Due to the scarce water resources and dry and semi-arid climatic conditions of Iran, water demand management has special importance in the whole economy, including the agricultural sector, because this sector has the largest share in water consumption. The purpose of this study was to estimate the water demand function and to analyze the cross and symmetrical relationships between water and other inputs. For this purpose, the Ordinary, Allen, and Morishima's substitution elasticity were calculated, and the substitution and complementary relationship between water and other inputs were determined. These elasticities determine the amount and sign of cross relationship of water. In order to achieve the objectives of research, the translog cost function, along with the input share equations were estimated using iterative seemingly unrelated regressions. The information was related to crops and period (2007-2015) in Qazvin. The results showed that water was a low-elasticity input and its value was -0.75. Also, the cross elasticity with pesticide, labor, machinery and land was calculated as 0.71, 0.99, 0.93, and 0.89, respectively, which implied the substitution relationship. Investigating symmetry of elasticities also implies the asymmetry of Ordinary and Morishima elasticities and symmetry of Allen's elasticity with other inputs. In this regard, the cross elasticity of inputs of pesticide, labor, machinery, land and water were calculated as 0.28, 0.86, 0.91, and 0.90, respectively, indicating the asymmetry of this elasticity. Differences between levels of cross elasticities depend on the cost share of the two inputs and the sign of estimated coefficient.
 

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