In the experiments,the fertilizers amounts of 13 and 26 kg were used,and the pressure differentials changed from 0.05 to 0.30 MPa with an incremental interval of 0.05 MPa. For all experiments,the pressure at the downstream of the tank was fixed at 0.10 MPa.

1. Experimental study: in accordance with the material characteristics, a set of new type of drying experimental facilities has been developed and improved, which consists of a multifunctional fixed bed and a spiral promotion vibrated fluidization bed.

According to the distributions of the flow fields in the cyclone air classifier with a fixed spherical wall, the formulas of the classification and collection cut sizes are presented and they are examined by experiment.

At the point that the retrofitted angle of the fixed tube was 10°,the length of the wheel fender was 80 mm and the location angle of the wheel fender was 120°, the sowing quality was the best.

The air cushion is composed of two tandem platforms with the same structure, which are connected with hydraulic mechanism. The front platform as base platform & the behind platform as moving platform are mutually fixed, which are pushed or pulled by hydraulic mechanism.

The results showed that the main factors affecting seed damaging were the interval between the moving plate and the fixed plate and the spring force of the pusher.

The paper studies generic commutative and anticommutative algebras of a fixed dimension, their invariants, covariants and algebraic properties (e.g., the structure of subalgebras).

A basis is calledmonomial if each of its elements is the result of applying to a (fixed) highest weight vector a monomial in the Chevalley basis elementsYα, α a simple root, in the opposite Borel subalgebra.

Rational smoothness and fixed points of torus actions

The symmetric varieties considered in this paper are the quotientsG/H, whereG is an adjoint semi-simple group over a fieldk of characteristic ≠ 2, andH is the fixed point group of an involutorial automorphism ofG which is defined overk.

LetMm be a closed smooth manifold with an involution having fixed set of the form (point)?Fn, 0>amp;lt;n>amp;lt;m.

According to test data conducted by M. E. Dodds and F. B. Dyck when cutting wheat, oats and barley at a table angle of 15°, the value of ξ, the ratio of forward speed to canvas speed, is chosen in the range 0.79 to 1.31 so as to get optimal windrows.When windrowing wheat, oats and barley, the superior limit of ξ is 1.31 while the inferior limit 0.61.The formulas ( 3 ) to ( 7 ) have been found which indicating the relationships between ξ and d, Bo,K, S1, S2,etc., and can be used in windrower calculation.Under...

According to test data conducted by M. E. Dodds and F. B. Dyck when cutting wheat, oats and barley at a table angle of 15°, the value of ξ, the ratio of forward speed to canvas speed, is chosen in the range 0.79 to 1.31 so as to get optimal windrows.When windrowing wheat, oats and barley, the superior limit of ξ is 1.31 while the inferior limit 0.61.The formulas ( 3 ) to ( 7 ) have been found which indicating the relationships between ξ and d, Bo,K, S1, S2,etc., and can be used in windrower calculation.Under test conditions conducted by M. E. Dodds and F. B. Dyck, the scope of allowed values S2 have been counted in this paper and the equation ( 7 ) has been discussed. When the yield Wo increases, value ξ tends to decrease correlatively (or to increase value d) and vice versa, so that counted values aren't beyond the scope of allowed one. If ξ, d are constant, changes in Wo will cause S2 easily to go beyond the scope of allowed values S2.ξ of an windrower is not a fixed value and it may be selected within certain limits in theory as well as in practice.

Of speedy comb-fixer, the two steel strips for fixing spring steel teeth were installed in front and rear inside the hive, with the square ends of the strips penetrating the left and right side of the hive. With the aid of a handlebar at the outer hive, the strip was revolved rectangularly, making the teeth force into the spaces between the neighboring side-bars to fasten the frames. This device, without opening the hive, handles quickly, conveniently and efficiently, with little vibration. As soon as...

Of speedy comb-fixer, the two steel strips for fixing spring steel teeth were installed in front and rear inside the hive, with the square ends of the strips penetrating the left and right side of the hive. With the aid of a handlebar at the outer hive, the strip was revolved rectangularly, making the teeth force into the spaces between the neighboring side-bars to fasten the frames. This device, without opening the hive, handles quickly, conveniently and efficiently, with little vibration. As soon as the strip is returned, the fastening for the combs will be taken away. The working efficiency will bo raised 15-fold.

Profits of certain farm machinery group for variable service areas are also differeat. The variable machinery cost per unit area can be conceived as constant, while the fixed machinery cost per unit area will be drop down as the service area grows up. The. relationship between the machinery cost and service area can be shown as hyperbolic curve on coordinate diagram. If the essential farm op-eration can't be performed in the due time period, timeliness loss will occur, the yield will drop. This paper derived...

Profits of certain farm machinery group for variable service areas are also differeat. The variable machinery cost per unit area can be conceived as constant, while the fixed machinery cost per unit area will be drop down as the service area grows up. The. relationship between the machinery cost and service area can be shown as hyperbolic curve on coordinate diagram. If the essential farm op-eration can't be performed in the due time period, timeliness loss will occur, the yield will drop. This paper derived analytically the relationship between the net production value per unit area and the service area. This relationship can also be shown in the same diagram as parabolic curve. This curve usually intersects with the said hyperbola at two points,the abscissas of these points indicate the lower and upper limit of the service areas of given machinery group, the perpendicular distances between two curves represent the net income per unit area. This net income can also be drawn as a curve Y on the same diagram. The poin ta twhich Y = max shows the optimum service area. Calculate and draw all the Y-curves for every possible machinery group, from these cur-ves, we can find a series values of Y for a given service area. Within these Y values, there will be a max. value, which is on the curve corresponding to reasonable machinery group for given area A. This paper derived all these me-ntioned calculating methods analytically. These methods are applied to Jia County, Hebei, on eight machinery groups for nine different service areas. The results of calculations on the machinery equipments are pretty close to the present real situations.