energy is one of major factors of productions in all of economic sectors, which have important effect on a country economy. the effect of increasing price of energy carriers on productions of economic sectors is inevitable. therefore, this research was conducted by using the input - output model and product forecasting. the study investigated the latest available input - output table in 1385. t...

An onolysis of student learning with the LISP tutor indicates thot while LISP is complex, learning it is simple. The key to factoring out the complexity of LiSP is to monitor the leorning of the 500 productions in the LISP tutor which describe the progromming skill. The learning of these productions follows the power-low learning curve typical of skill acquisition. There is transfer from other ...

Let E n = {[τ ]a = (τ (a1) 1 , . . . , τ (an) n )|τ ∈ Sn, 1 ≤ ai ≤ r} be the set of all signed permutations on the symbols 1, 2, . . . , n with signs 1, 2, . . . , r. We prove, for every 2-letter signed pattern [τ ]a, that the number of [τ ]a-avoiding signed permutations in E n is given by the formula n ∑ j=0 j!(r−1) ( n j 2 . Also we prove that there are only one Wilf class for r = 1, four Wil...

Recently, a mechanism for relaxing a large cosmological constant (CC) has been proposed [1], which transforms any initial vacuum energy density of arbitrary sign and magnitude into a harmless quantity without fine-tuning. The setup is implemented in the ΛXCDM framework, and it yields a reasonable cosmological background evolution similar to the ΛCDM model with a fine-tuned CC. In this work we a...

We report observations of SMC X-1 in three new high-intensity states with ROSAT HRI in December 1995, May 1997, and March 1998 in which pulsations with a period of 0.70769 (± 0.00006) s, 0.70706 (± 0.00001) s, and 0.706707 (± 0.00001) s respectively were detected. Combining the pulse periods from observations with ROSAT PSPC in high-intensity states in October 1991 and March 1998, respectively,...

It is pointed out that the recently measured left-right asymmetries in inclusive pion and lambda hyperon production processes are in very good agreement with the relativistic quark model, proposed some time ago. Further predictions based on this model for hyperon productions, for lepton pair productions and for W/Z-boson productions are also presented.