In order to protect the welding caused deformation of the bottom plate in the large oil tank,the structure design and welding method of the bottom plate can be improved.

It also expounds the feasibility of cathodic protection on the bottom plates of tanks. By making cathodic protection tests on the bottom plate of a 10, 000m3tank,it is shown that its protective effects fully meet the related requirements of the Design Code of Oil Depot (GBJ74-84).

The statistic information shows that the bottom plate suffered the most severe corrosion among the corrosions at different sections of the vertical cylindrical steel oil tanks.

In the light of structure and operation behavior of oil tank,an overall investigation on the bottom plate corrosion of oil tank is made. The paper analyses the corrosion mechanism of bottom plate of oil tank located in pumping station,puts forward some protection measures including improving the technology design of oil tank,applying available steel material and utilize the CP technology.

The errors among the theoretical values,finite element analysis(FEA) calculation values and the testing values of the radial stress on the bottom plate upper surface were also compared. Based on the settlement feature of the armored concrete ring wall and the elastic foundation,the settlement difference between the two different foundations was used as the boundary conditions of the FEA model.

According to the damage form and corrosion features of the bottom plate of oil tanks, it is considered that the distribution of corrosion depth is amenable to the maximum distribution of peak I and the corrosion life is amenable to the minimum distribution of peak Ⅰ.

Comparing several methods for stress calculation of tanks shell and bottom plate,theory of combined cylindrical shells was proposed for calculating stress of tanks shell,and finite element analysis based on foundation settlement was proposed for stress calculation on the bottom plate.

The prism group is consist of six nonstandard angle prisms, a bottom plate and two filters, the prism angle error≤5″, vertical error≤10″ between all surface of parts and the bottom plate. The width of air gap is 0.05mm.

The liquid enters the gap through a hole in the bottom plate.

One practical relevance of these problems is discussed with regard to the uplift of the bottom plate of vertical unanchored liquid storage tanks.

At the top of the top plate and the bottom of the bottom plate, we consider boundary conditions for which a linear combination of the convective temperature field and its vertical derivative vanishes.

Right after the collapse of the deck structure, the bottom plate fractured just in front of the transverse bulkhead at Fr.153.

The mechanism of fracture at the bottom plate is also discussed based on the observed fracture surfuce of the cross section.

In calculating the strength of V-shaped bottom structure of a planing craft, there occurs a problem of how to calculate the virtual moment of inertia of V-shaped plating.The determination of scantlings of bottom structure largely depends upon the accuracy of the calculated virtual moment of inertia.In the present time, the formulas given by Papkovich, Shimanski and Kurdumov are generally used by naval architects.However, for a given structure, by applying the above three methods, we have obtained quite different...

In calculating the strength of V-shaped bottom structure of a planing craft, there occurs a problem of how to calculate the virtual moment of inertia of V-shaped plating.The determination of scantlings of bottom structure largely depends upon the accuracy of the calculated virtual moment of inertia.In the present time, the formulas given by Papkovich, Shimanski and Kurdumov are generally used by naval architects.However, for a given structure, by applying the above three methods, we have obtained quite different results, and there are also some defects in the assumptions used in each method. A method mostly applied to calculate the strength of materials and the bending theory of beams (including deflections due to shear) have been used by Papkovich to solve the problem of virtual moment of inertia of V-shaped plate.Based on the plane problem of theory of elasticity, Shimanski assumed the plate to he infinite width, and obtained formula for calculating the virtual moment of inertia under two boundary conditions, i.e.the keelson is either simply supported or fixed.By using the theory of beams on an elastic foundation, Kurdumov has taken account of the plane stress condition of the bottom plate and also the case of a keelson having different end fixity only without consideration of the influence of the deformation in bulkheads.An effort has been made by authors in order to make the results more accessible to practical condition.Three V-shaped bottom structure models of different angle of rise, plate width, under different boundary conditions were tested, experimental results are compared with theoretical ones obtained by the authors' method.On the basis of experiments the authors propose a method for calculating the virtual moment of inertia of the V-shaped bottom structure.

In this paper some novel adaptor circuits are proposed to realize the unit element wave switched eapacitor filters driven by two phase clock signals. These circuits are very insensitive to the bottom plate parasitic capacitanees. To realize an adaptor only one unit-gah buffer is needed. The effects of top plate parasitie capacitanees and switch parasitic capacitanees on the adaptor are analyzed. The results show that the effects of the parasitics are small and can be reduced further by changing only...

In this paper some novel adaptor circuits are proposed to realize the unit element wave switched eapacitor filters driven by two phase clock signals. These circuits are very insensitive to the bottom plate parasitic capacitanees. To realize an adaptor only one unit-gah buffer is needed. The effects of top plate parasitie capacitanees and switch parasitic capacitanees on the adaptor are analyzed. The results show that the effects of the parasitics are small and can be reduced further by changing only one of the capaeitances. These cireuits are adaptable for realizing programmable filters and very useful to the PLC real-time speech synthesis. As an example, a 5th order unit element low-pass filter is given. The experimental results are in good agreement with the theoretical ones.

In this paper, some novel adaptor circuits are presented to realize the wave switched capacitor filters using two-phase clock signal. The resulting filters are not only insensitive to the bottom plate parasitics but also the effects of top plate parasitics and switch parasitics are very small. In addition, the wave switched capacitor filters are showing the excellent behaviors such as low sensitivity, large dynamic range, good stability and high modularity. As an example, a 5th order PCM low-pass...

In this paper, some novel adaptor circuits are presented to realize the wave switched capacitor filters using two-phase clock signal. The resulting filters are not only insensitive to the bottom plate parasitics but also the effects of top plate parasitics and switch parasitics are very small. In addition, the wave switched capacitor filters are showing the excellent behaviors such as low sensitivity, large dynamic range, good stability and high modularity. As an example, a 5th order PCM low-pass wave switched capacitor filter is given. The experimental results are in good agreement with the theory.