Abstract: A soluble metal sealing ring with a controllable dissolution rate and preparation process thereof include an aluminum alloy sealing ring matrix and a composite coating coated on an outer surface of the aluminum alloy sealing ring matrix whose standard electrode potential is greater than ?0.3 volts (V). The preparation process includes: (1) preparing a high-plastic aluminum alloy; (2) preparing the aluminum alloy sealing ring matrix by machining; (3) annealing the aluminum alloy sealing ring matrix; (4) mixing raw materials of the composite coating evenly; (5) preparing the composite coating on an outer surface of the aluminum alloy sealing ring matrix; (6) preparing holes. The soluble metal sealing ring solves problem that good sealing performance and good dissolving performance are difficult to obtain simultaneously in the existing product, and has advantages of good sealing performance, controllable dissolving rate, no blockage and others.

Abstract: A soluble metal sealing ring with a controllable dissolution rate and preparation process thereof include an aluminum alloy sealing ring matrix and a composite coating coated on an outer surface of the aluminum alloy sealing ring matrix whose standard electrode potential is greater than -0.3 volts (V). The preparation process includes: (1) preparing a high-plastic aluminum alloy; (2) preparing the aluminum alloy sealing ring matrix by machining; (3) annealing the aluminum alloy sealing ring matrix; (4) mixing raw materials of the composite coating evenly; (5) preparing the composite coating on an outer surface of the aluminum alloy sealing ring matrix; (6) preparing holes. The soluble metal sealing ring solves problem that good sealing performance and good dissolving performance are difficult to obtain simultaneously in the existing product, and has advantages of good sealing performance, controllable dissolving rate, no blockage and others.

Abstract: A method for establishing mathematical model of relationship between spontaneous imbibition volume and time of porous medium includes sample pretreatment, fully-saturation and centrifugal experiments and NMR T2 measurement. First, two rock core samples of predetermined size are selected for cleaning and drying. The first rock sample is vacuumed and injected with water to obtain a saturated sample for NMR T2 measurement. Then, spontaneous imbibition experiment is conducted on another sample, and T2 measurements are conducted to obtain the water distribution and migration characteristics during the imbibition process. Next, the calculation of the imbibition permeability, average capillary pressure and surface relaxivity are conducted based on the NMR data obtained from two samples. Finally, substitute these parameters into the Handy relationship to obtain a new NMR-based mathematical spontaneous imbibition model.

Abstract: A method of computing the number of visitors via a location updating procedure includes the steps of generating a DTAP by a mobile station, sending the DTAP to an operator mobile network through a base station from the mobile station, and then sending the DTAP to a location updating procedure so as to identify the user's position. The method takes advantages of the existing mobile roaming service cooperated with the location updating procedure to transmit the DTAP from the mobile station to the location updating procedure. Therefore, one can use a searching interne to obtain the number of visitors in a specific location.

Abstract: A memory recalling system comprises a memory recalling device having a message collection module, a memory backup module operatively connected with the message collection module so as to receive a input message to generate historical memory assistance data, a memory assistance module operatively connected with the message collection module so as to receive a query message to find the answers for the query message, a storage module arranged to store the historical memory assistance data and the answers for the query message, an interaction and control module operatively connecting with a visual display indicator, the message collection module, and the memory assistance module and the memory backup module. In addition, the memory recalling system further comprises a remote terminal storage wireless connected with the memory recalling device wherein the remote terminal storage is arranged to store the historical assistance memory data from the storage module.