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104results about How to "Improve long-term performance" patented technology

Data analysis method and device based on AB test result, equipment and medium

PendingCN112907128ASolve the performance measurement problemImprove performanceResourcesAbsolute differenceSimulation
The invention discloses a data analysis method and device based on AB test results, equipment and a medium, and relates to the technical field of computers, in particular to the field of machine learning. According to the specific implementation scheme, the method comprises the steps: in a first time period, providing a test application and a current application for an experimental group and a control group respectively for AB testing, wherein at least one difference application function exists between the test application and the current application; according to the retention rates of the experimental group and the control group in the first time period, predicting the retention rate index values of the experimental group and the control group in the second time period, wherein the first time period is smaller than the second time period; calculating a retention rate index absolute difference value between the experimental group and the control group according to the retention rate index values of the experimental group and the control group in the second time period; according to the absolute difference value of the retention rate index, determining the effect of the difference application function in the test application, so the effect of the test application with the updated application function can be comprehensively measured for a long time.
Owner:BAIDU ONLINE NETWORK TECH (BEIJIBG) CO LTD

Header body pressure-bearing type water storage type heat exchanger

The invention discloses a header body pressure-bearing type water storage type heat exchanger. A plurality of cold water round pipes are connected between two header bodies, round inner hole reinforcing plates are arranged in pipe orifices, the outer plate edges of the plates are connected with the cold water round pipe orifices through welding, and inner hole plates, cold water round pipes and round inner hole reinforcing plates are welded into a single unit in a close fit mode; in each cold water round pipe, a heating round pipe or a plurality of branched small heating round pipes of a combined heating round pipe are inserted in the holes of each round inner hole reinforcing plate, and the combined heating round pipe comprises short connecting pipes at the two ends and a plurality of branched small heating round pipes arranged at the middle in a connecting mode; the heating round pipes and / or combined heating round pipes are connected through heating connecting round pipes; external plates of the headers surround the heating round pipes or combined heating round pipes and are tightly welded with the internal hole plates of the headers. According to the header body pressure-bearing type water storage type heat exchanger, the round inner hole reinforcing plates enable the cross sectional area of the header hole plate to be increased, the compressive strength and tensile strength of the header hole plate are reinforced, and the fatigue damage to pipe socket fillet weld due to expansion thermal stress and temperature cycling is effectively prevented.
Owner:山东利能换热器有限公司

Cylindrical horizontal physical simulation test device for coal mine sinking and driving engineering

The invention provides a cylindrical horizontal physical simulation test device for coal mine sinking and driving engineering. Each confining pressure loading unit is of a half structure and is formed by connecting and assembling an upper half-round arc plate and a lower half-round arc plate which are completely symmetric through longitudinal flanges and high-strength bolts, the whole device comprises five confining pressure loading units of the half structures in total, and the adjacent half structures are connected through circumferential flanges and high-strength bolts. A loading end cover and a constraining end cover are designed at the two ends of the device and are connected with a cylinder formed by the half structures through high-strength bolts. Radial loading oil cylinders are arranged at equal intervals in the radial direction along the circumference of a confining pressure loading mechanism, wherein two circles of radial loading oil cylinders with the total number of twelve are evenly arranged on each half structure unit, in other words, sixty radial loading oil cylinders are arranged on the five half structures in total. Four axial oil cylinders are arranged on the loading end cover. The integrity and rigidity of the confining pressure structures are improved; besides, the confining pressure loading units of the half structures can carry out independent loading and individual control on test models, and the requirement for tests with different sizes of models with different functions is met.
Owner:ANHUI PROVINCE COAL SCI RES INST

Explosion-proof dust sealing device for explosion-proof motor

The invention discloses an explosion-proof dust sealing device for an explosion-proof motor. The bottom of the sealing device is an explosion-proof surface; the explosion-proof surface comprises motor shaft explosion-proof surface at the inner end and an outer cover explosion-proof surface at the outer end; a platform surface perpendicular to a motor shaft is arranged at the outermost end of the explosion-proof surface; a Teflon sealing ring is arranged on the platform surface, and comprises a sealing bottom ring close to the platform surface and a sealing lip for sealing the motor shaft; the sealing bottom ring is locked on the platform surface through a locking friction plate; a part outwards extending from the platform surface is a fixed ring in which three assembly holes are formed; during mounting, the bottom of the fixed ring is close to the outer end face of an outer cover of the motor; matched assembly holes are formed in the outer end face of the outer cover of the motor; an axial plane oil seal is also fixedly arranged on the motor shaft; a lip of the axial plane oil seal is sealed with the outer end face of the locking friction plate in an interference fit way. According to the explosion-proof dust sealing device, with the adoption of the inner and outer explosion-proof surfaces and the double-layer sealing design of the axial seal and the end face seal, the dustproof efficiency and safety of the whole protective sealing device are improved, and the service life of the whole protective sealing device is prolonged.
Owner:WUJIANG TIANLONG ELECTRONICS MACHINERY EQUIP
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