---

Abstract
After scrutiny the problem of time in Persian verbs, the writers of present essay proceed to revise the usage of auxiliary and modal verbs and by putting forward and criticizing the paroles of writers of Grammar about this subject, reject the difference of these two verbs and expressing the similarities of them in language and showing that modal and auxiliary verbs have the same usage; Then by presenting the verb 'willing' as auxiliary (but not modal) verb in verbs like "would to go" and "was going to go" and etc. putting forward the existence of the time of "future in the past" in Persian language and compering it with some time with the same name in English language. The writers believe that the time "future in the past" is not only a time but in combination with other times it can create some new times in it's subset.

 

---

Abstract In this research, a finite volume-Lattice Boltzmann Method (FVLBM) for simulation of inviscid compressible flows in 1-D and 2-D structured curvilinear coordinate system is presented. In this simulation, LBM, with new method of Circular Function idea instead of expansion or correction of Maxwelian function was implemented for evaluation of equilibrium distribution functions, moreover, in order to capture discontinuities in the flow field, 3rd order MUSCL scheme was implemented for approximation of convective term. Since in lattice Boltzmann method time step is extremely limited by relaxation time (Knudsen number), we improved performance of FVLBM with a third-order IMEX Rung-Kutta scheme for temporal discretization of BGK-model for archiving greater time step and lower CPU time. Consequently, the present work can be used widely for simulation of actual engineering problems in aerodynamics. Various gas dynamics benchmark problems and applied engineering unsteady problems in curvilinear coordinate grid is solved for validation. The numerical results of the presented method are compared with experimental dates and the results of FVM Euler solutions; there is good agreement between the results of the present method and those of the references.

---

Retrotransposons (RTNs) constitute informative molecular markers for plant species because of their ability to integrate into a multitude of loci throughout the genome and thereby generate insertional polymorphisms between individuals. In the present study, RTN-based molecular markers, IRAP (inter-retrotransposon amplified polymorphism) and REMAP (retrotransposon-microsatellite amplified polymorphism), were applied to study RTN integration events and genetic diversity in 100 melon genotypes (88 genotypes from 11 populations, three inbred lines, and 9 hybrids). A total of 94 and 262 loci were amplified using 5 IRAP and 15 REMAP primers, respectively. The percentage of polymorphic loci (PPL) in populations ranged from 39% (Zivari Shahrood) to 48% (Shadegani E). The Mantel test between IRAP and REMAP cophenetic matrices evidenced no significant correlation (r= 0.29). IRAP+REMAP-based cluster analysis using UPGMA algorithm and Dice similarity coefficient depicted 6 groups among 100 melon genotypes. AMOVA revealed the higher level of genetic variation within populations (67%) compared to among populations (33%). The mean Fst values of all groups, except for group VI, were more than 0.20, demonstrating differentiation among the populations and genetic structure of the studied melon collection. 

---

Potential treatment risks refer to those risks that concern treatment measures in its strict sense, and these risks must not be predictable at the time of concluding the treatment contract between the physician and patient. Of course, the conventional meaning of these risks relates to the situation in which its arrival is neither that of the doctor’s default, nor that of the patient’s default. In this paper, the reasons behind the recoverability of potential treatment risks were analyzed, and we came to the conclusion that, on the one hand, the doctor is not liable for these risks because of the observance the scientific standards and conventional manners of doctors during special conditions and circumstances of treatment, and like France, there should be taken into account some special provisions in Iran’s law, and on the other hand, on the subject of compensating patients for unjust losses in this respect, since they (patients) have not defaulted in the course of incurring these losses, it would be reasonable that the Iranian legislator protects the patients’ interests by establishing “a security fund related to compensating aggrieved people due to terrorist activities, crimes and accidents whose causes are unknown or it’s impossible to get blood money from the harming party for any reason”, just like France’s law in which such losses are recoverable from a specific security fund by complying with special conditions and formalities.