156 results about "Proportional Stratified Sampling" patented technology

A computer implemented method prices derivative securities (for example, options) by selecting an importance sampling (IS) distribution and combining the chosen IS distribution with stratified sampling. The process consists of the steps of choosing an importance sampling distribution and combining the chosen importance sampling with stratification or Quasi-Monte Carlo (QMC) simulation. In the first step, an importance sampling distribution is chosen. In the second step, the chosen importance sampling is combined with stratification or Quasi-Monte Carlo sequencing. The pricing of many types of securities reduces to one of estimating an expectation of a real-valued function of some random variables.

The invention relates to a sampling device, in particular to a layered sampling device for soil testing. The technical problem to be solved by the present invention is to provide a layered sampling device for soil testing which is simple in sampling operation, saves time and effort, has high sampling efficiency, can obtain deep soil, and can sample layered layers. In order to solve the above technical problems, the present invention provides such a layered sampling device for soil testing, which includes a sampling box, a lower bearing seat, an upper bearing seat, a screw, a nut, a conical block, a first slide rail, a first slide blocks, telescopic connecting rods, shovels, discs, handles, etc.; there is a lower bearing seat in the middle of the bottom of the sampling box, an upper bearing seat in the middle of the top of the sampling box, and a screw between the lower bearing seat and the upper bearing seat. Extend outside the top of the sampling box. The present invention uses manual operation as power to simultaneously sample soil at different depths, which saves a lot of manpower and material resources to a certain extent.

The invention belongs to the technical field of underground water sampling and particularly relates to an underground water depth-setting stratified sampling device and an underground water depth-setting stratified sampling method applicable to regions without wells. The underground water depth-setting stratified sampling device at least comprises a sampling mechanism, a connecting mechanism and an underground sample injection mechanism, wherein the sampling mechanism comprises a first sampling mechanism body, a second sampling mechanism body, a sampling bottle, a gas-phase check valve, a nested flow splitting mechanism, a ball valve and a wellhead fixing support seat, the underground sample injection mechanism comprises a first underground sample injection mechanism body and a second underground sample injection mechanism body, and the connecting mechanism comprises a first connecting rod and a second connecting rod. Compared with similar technical products, the underground water depth-setting stratified sampling device applicable to the regions without the wells has the advantages that the device is novel in structural design and improved in working performance, functions, precision, stability and durability substantially, integrates a high-precision stratified sampling function and an underground water level line fluctuation monitoring function and can be rapidly mounted in the regions without the wells.

The invention provides a soil stratified sampling device for hydrogeological survey which comprises a supporting fixing plate and a motor, the center of the supporting fixing plate is hollow, a motor positioning clamp is integrally mounted in the supporting fixing plate, the motor is fixedly mounted in the motor positioning clamp in a limiting manner, and a sampling mounting pipe is mounted at the output end of the lower end of the motor through a connecting ring; a plurality of sampling assemblies are mounted in the sampling mounting pipe in a penetrating manner. According to the sampling device, soil of different layers can be sampled in a classified mode through the sampling assemblies, and simultaneous collection is achieved. Compared with the prior art, the situation that multiple times of repeated treatment are needed due to the fact that only one kind of soil can be sampled at a time is avoided; and the position of the supporting fixing plate can be slid through a movable assembly, so that personnel can drill soil conveniently, and compared with the prior art, the problem that deviation is caused by position deviation due to the fact that no supports are arranged on the two sides is effectively solved.

The invention discloses a sampler for undisturbed soil, and belongs to the technical field of soil sampling. The sampler comprises a rotating handle, sample storage barrels and a sampling drill bit, wherein the bottom end of the rotating handle is connected with a sample storage barrel mounting base; the sample storage barrels are mounted in the sample storage barrel mounting base; the sampling drill bit is detachably connected to the bottom end of the corresponding storage sample barrel; a plurality of the sample storage barrels are arranged; the plurality of the sample storage barrels are detachably connected up and down in sequence; the sampling drill bit is arranged at the bottom end of the bottommost sample storage barrel. The plurality of the sample storage barrels are arranged; through adjusting the quantity of the sample storage barrels, a length of the whole sampler can be adjusted; the soil at a different depth can be sampled; the stratified sampling is realized; the sample storage barrels can also have different lengths; the length of the sampler can be more flexibly adjusted, and the stratified sampling can be further better realized.

The invention discloses a method for analyzing emotion polarity of long text news public opinions, which comprises the following steps: S1, collecting text data as a training sample, S2, performing data cleaning on the data of the training sample collected in the step S1, and processing special characters in the cleaned data of the training sample to obtain a data set; S3, segmenting the data set,and segmenting the training sample into a training set and a test set according to a proportion; S4, establishing a deep learning network based on the representation model and loading pre-training parameters; S5, building a long text sentiment polarity analysis network model; S6, modifying a training sample data structure; and S7, model training: adopting a stratified sampling and K-fold cross validation method to ensure that the sample proportion in the sample data set of each fold is consistent with the original data proportion during stratified sampling, storing the model result of each fold in the model with the highest score of the validation set, integrating the K-fold model to test the test set, and taking the average probability as the test result of the model.

The invention discloses a system and a method of using traffic conflicts for judging accident-prone sections. Using the system and the method can not only judge whether a certain section is an accident-prone section or not but also give out accident-prone time periods and prone accident types to provide specific data support for subsequent warning and management works. Owing to supermatic judgment means, the defect of incompleteness of an existing traffic accident database is overcome, the system and the method are more accurate and scientific as compared with previous manual observation of conflicts, and application of traffic conflict techniques to engineering can be effectively promoted. By adopting traffic flow parameter detection equipment to acquire continuous 24-hour traffic flow information as auxiliary and by using a stratified sampling investigation method to provide the basis for selection of traffic conflict investigation time periods, precision in determination of traffic conflict amount can be improved, and the system and the method are also applicable to nighttime traffic conflict investigation and have practical engineering application value in the aspect of providing the basis for selection of traffic conflict investigation time periods.

The invention relates to the technical field of sample collecting devices, in particular to a liquid stratified sampling device .The device comprises a sampling tube and a sampling support .The sampling tube is formed by connecting a plurality of sampling tube units end to end .Each sampling tube unit comprises a tube body, a stop valve and a rack .The lower end of each stop valve is in sealed fixed connection with the upper end of the corresponding tube body .Matched sealed connection mechanisms are arranged at the lower end of each tube body and the upper end of the corresponding stop valve .The uppermost stop valve is provided with a stop valve switching device .The sampling support comprises a base plate, a longitudinal beam and a guide rail .The longitudinal beam is rotationally mounted on the base plate, the base plate is provided with a first motor for driving the longitudinal beam to rotate, an electric telescopic device is arranged between the guide rail and the longitudinal beam, a gear and a second motor for driving the gear to rotate are mounted on the guide rail, and the rack can slide perpendicularly along the guide rail and is engaged with the gear .The liquid stratified sampling device is high in sampling precision, large in sampling range, easy and convenient to operate, high in automation degree and easy to carry, and the original state of a sample can be observed visually.

The invention provides a business activity effect determination method and device, and the method comprises the steps: calculating the tendency scores of a user who participates in a business activityand a user who does not participate in the business activity through the business activity feature information of the user who participates in the business activity and the user who does not participate in the business activity; and based on the calculated tendency score, carrying out stratified sampling, screening out homogeneous user groups of the users participating in the business activity, namely obtaining experimental group users and control group users, and respectively determining the effect of the business activity according to the behavior information of the experimental group usersand the control group users. Users participating in the business activities and users not participating in the business activities are not directly used for evaluating the marketing effect; however,the homogeneous user groups of the users participating in the business activities are selected for comparison, and the homogeneous user groups are similar to the features of the users participating inthe business activities, so that the assessment of the business activity effect is more reasonable, and the accuracy of the assessment result of the business activity effect is improved.

Techniques and mechanisms described herein facilitate adaptive fuzzy fallback stratified sampling. According to various embodiments, an actual or estimated minimum vertex cover of a feature dependency graph representing a dataset may be determined. The dataset may include a plurality of feature vectors and a plurality of features. Each feature vector may include a plurality of feature values that correspond with the features. The feature dependency graph may represent a plurality of conditional dependencies between the features. The minimum vertex cover may designate a subset of the features for strata selection. The feature vectors may be partitioned into a plurality of strata based on the designated subset of features. Each stratum may include one or more of the feature vectors. Each feature vector may be assigned to a corresponding stratum based on the values of the designated subset of features for the feature vector.

The invention relates to a testing apparatus used for researching a dissected sintering process. The testing apparatus comprises a sintering pot body which is characterized in that: a built-in cylindrical sleeve is arranged on a bar grate in the sintering pot; the cylindrical sleeve is formed by two semi-cylindrical sleeves; the height of the cylindrical sleeve is set as that: when the cylindrical sleeve is placed on the bar grate in the sintering pot, the upper level of the cylindrical sleeve is aligned with the port of the sintering pot; a separating plate is arranged at the middle part of the cylindrical sleeve; supports are symmetrically arranged on the bottoms of the semi-cylindrical sleeves; and the cylindrical sleeve bar grate is placed on the supports. The application method comprises steps that: the sintering pot is arranged on an air pumping pipeline; a layer of asbestos ropes is paved on the bottom between the sintering pot and the sleeve; the gap between the sintering pot and the sleeve is filled by heated sand; a sintering mixture is fed in the sleeve, and is ignited; sintering and air pumping are carried out; after sintering, nitrogen is delivered in the sleeve, and cooling is carried out by blowing; epoxy resin is filled into one side of the sleeve separating plate, and the state of the other side is maintained; at the side that is not filled with epoxy resin, stratified sampling is carried out from bottom to top; and the samples are used in chemical analysis; the side that is filled with epoxy resin forms a half of a complete sintering cake, which can be used in dissection and microscope observation analysis.

The invention discloses a soil detection device with a stratified sampling mechanism, and relates to the technical field of soil detection devices. The problem of the application range of the whole device is solved. The device specifically comprises a sampling column, a mounting plate is arranged on the outer wall of the top of the sampling column, a threaded rod is fixed to the outer wall of thetop of the mounting plate through a bearing, the outer wall of the top of the threaded rod is sleeved with a rotating ring, and the outer wall of the bottom end of the threaded rod is connected with four worms distributed at equal intervals through connecting rings; a rotary sampling mechanism is fixed to the outer wall of the back face, close to one side of each worm, of the sampling column through a rotating shaft, one side of each rotary sampling mechanism is meshed with the corresponding worm, four sampling holes are formed in the outer wall of the side, close to the corresponding rotary sampling mechanism, of the sampling column, and a guide rod is arranged on the outer wall of the bottom end of one worm; a guide cone is arranged on the outer wall of the bottom end of the guide rod. According to the invention, not only is the stratified sampling amount of soil improved, but also the soil can be sampled and collected under the condition of lower soil porosity.

The invention discloses an in-situ stratified sampling device of soil seepage water. The in-situ stratified sampling device comprises a first-grade sampling pipe, wherein the first-grade sampling pipe is divided into a plurality of sampling chambers along the axial direction; a cone is arranged at the bottom of the sampling chamber at the bottommost part; a flow guide hole is formed in a pipe wall at a 1/4 part of each sampling chamber from top to bottom, and a sampling window is arranged on a pipe wall of each lower half part at the height of 1/2; one side of each sampling window is hinged to a window door through a hinge, and an arc-shaped inserting hole and a handle are formed in and arranged at the other side of each sampling window and the corresponding window door respectively; the inserting holes and the handles are fixedly connected through bolts to close the window doors; a funnel with an upward trumpet opening is arranged between the flow guide hole of each sampling chamber and the corresponding sampling window, and the edge of the opening of each funnel is fixedly connected with the inner wall of the corresponding sampling chamber; a bottom plate of each sampling chamber is a sample carrying platform; a liquid collection bottle is arranged on each sample carrying platform; a liquid outlet of each funnel stretches into a bottle opening of the corresponding liquid collection bottle. The device disclosed by the invention can be repeatedly utilized and is convenient to wash; the device is simple, and is easy to operate; technicians can easily learn and grasp the utilization of the in-situ stratified sampling device.

The invention discloses a stratified sampling device of surface water. The stratified sampling device of the surface water mainly comprises a sampling inner rod, a sampling bottle fastener, a sampling bottle, a sampling outer rod, a sampling bottle plug, a sampling bottle plug fastener, a clamping buckle 1, a clamping buckle 2, a sampling outer rod penetrating hole, a sampling inner rod penetrating hole, a clamping buckle hole 1, a clamping buckle hole 2, a clamping buckle 3, a sampling bottle plug rod and a sampling bottle rod. Sampling is conducted in the vertical direction of a water body, by means of a common stratified sampling device of the surface water, water samples usually are sampled in the vertical direction by several times, when the water body is sampled by several times, the disturbance to the water body is relatively large, and it cannot be ensured that sampling is conducted completely at the same point, the authenticity of the measured data is affected to a certain extent, and meanwhile, and fractional sampling increases the sampling workload. Therefore, the stratified sampling device of the surface water is designed and studied, and the device is simple in structure and convenient in operation, meanwhile, multiple groups of required water samples can be obtained in the vertical direction at the sampling point, and the disturbance to the water body is reduced.

The invention discloses a soil stratified sampling device for hydrogeology, wherein the device comprises a mounting plate; a pressing mechanism is arranged at the upper end of the mounting plate and extends to the lower portion of the mounting plate, a sampling assembly is arranged on the lower portion of the pressing mechanism, and a stratification mechanism is arranged in the sampling assembly; a storage battery pack is fixedly mounted on the rear portion of the upper end of the mounting plate, a control table is fixedly mounted on the front portion of the upper end of the mounting plate, the control table is electrically connected with the pressing mechanism, the stratification mechanism and the storage battery pack, and a status lamp, a power switch and a control switch are arranged at the upper end of the control table; and the left end and the right end of the mounting plate are each fixedly provided with two connecting rods which are symmetrical front and back, and the upper ends of the two connecting rods are jointly and fixedly provided with a storage frame. According to the soil stratified sampling device for hydrogeology, stratified sampling can be conducted on soil, soil stratification is clear, the sampling accuracy is high, the sampling assembly can be detached and replaced, practicability is high, the intelligent degree is high, and use is convenient.

The invention relates to a stratified sampling device for a water body at any depth. The stratified sampling device effectively solves the problem that multiple layers of water samples at any depth cannot be taken at a time. According to the technical scheme, the device comprises a vertical plate, a plurality of water collecting tanks are fixed to the front side face of the vertical plate, pistonsare installed in the water collecting tanks, and vertically-through through grooves are formed in piston rods; a first shifting rod is hinged to the left end face of the water collecting tank, a groove is formed in the piston rod, a guide rod is installed on the left side of each vertical plate, and a compression spring enabling the guide rod to reset downwards is installed at the lower end of each guide rod; a plurality of protruding blocks are mounted on the guide rods; the distance between the protruding blocks and the piston rods is sequentially reduced from top to bottom. The upper endsof the guide rods are connected with ropes, and a plurality of buoys of which the positions can be randomly adjusted are arranged on the ropes; by moving the position of each buoy, the submerging depth is adjusted, the water collecting depth of each water collecting tank can be freely adjusted, meanwhile, sampling is accurate, and samples cannot be polluted.

The invention provides a Zhengtian pill mixing process end point determination method. The method comprises the steps of stratified sampling in the mixing process, near infrared spectrum collecting for a sample in the mixing process, mixing uniformity calculating through variable coefficients, spectrum pretreating and waveband selecting, mixing end point judging through principal component analysis and mahalanobis distance and Zhengtian pill mixing end point time determining. According to the Zhengtian pill mixing process end point determination method, a near infrared online analysis technology is introduced into the Zhengtian pill mixing process, and therefore evaluation on the mixing uniformity of powder is achieved; the method is reasonable in design and beneficial for improving the quality control level of the Zhengtian pill mixing process, and it can be adequately guaranteed that the product quality is stable and reliable; quick and in-time judgment on the mixing uniformity and a mixing end point in the Zhengtian pill mixing process is achieved, improvement of the production efficiency is facilitated, the production quality is guaranteed, and great realistic significance is achieved for traditional Chinese medicine industry technical progress and product quality upgrade.

The invention discloses a method for testing the iodide ion diffusion coefficient of concrete, which comprises the following steps: soaking the treated concrete test block in an aqueous solution of sodium iodide for not less than 30 days; The iodide ion deposition amount of each layer was obtained by chemical analysis of the powder sample; the iodide ion diffusion coefficient was calculated by nonlinear fitting of Fick's second diffusion equation with the obtained iodide ion deposition amount data of each layer. The present invention uses iodide ions instead of chloride ions as penetrating ions when measuring the diffusion coefficient of chlorine ions, studies the penetration process and combination mechanism of iodide ions in concrete structures, and compares them with the diffusion process and combination of chloride ions to establish iodine ions. The ion natural diffusion experiment method calculates the iodine ion diffusion coefficient and then converts it into the chloride ion diffusion coefficient, thereby solving the problem of the permeability coefficient of the internal chloride ion concrete structure.

The invention discloses a movable on-line monitoring bio-trickling filtration deodorization equipment, comprising carrying vehicle arranged with bio-trickling filtration deodorization equipment, comprising gas inlet system, gas purifying system, gas sample on-line monitoring system, and liquid sample on-line monitoring system. Bio-deodorization can be carried out for polycomponent simulated foul gas or real gas by the mentioned device, Gas sensor or gas chromatograph, temperature or moisture sensor, pH meter probe, ORP meter probe, etc. for monitoring on-line are employed by the device in the invention, as a result, stratified sampling for fill bio-membrane sample in bio-trickling filter is carried out, ecological analysis of microorganism becomes possible, and optimization and control for the activity of microorganism and performance of bio-filter can be realized.

The invention relates to an underground water stratified sampling device which comprises a sampling barrel with a fixing frame, a sampling inner pipe and a sampling outer pipe, and the sampling barrel is in threaded connection with the sampling outer pipe; wherein a plurality of partition plates are arranged in the sampling inner tube, the inside of the sampling inner tube is divided into a plurality of sampling cavities by the partition plates, a sampling air bag is arranged in each sampling inner cavity, an air pipe is arranged in the sampling inner tube, each sampling air bag is communicated with an air pump arranged on the fixing frame through the air pipe, a plurality of sampling inner holes are formed in the sampling inner tube, and at least one sampling inner hole is formed in the side wall of each sampling cavity; a plurality of sampling outer holes are formed in the sampling outer pipe, and the sampling outer holes in the sampling outer pipe correspond to the sampling inner holes in the sampling inner pipe one by one; a plurality of filtering windows are arranged on the sampling barrel, and each filtering window corresponds to the sampling outer hole in position; a balancing weight is arranged at the bottom of the sampling outer pipe. By means of the device, water samples of different aquifers can be collected from a single sampling well, the device is suitable for a phreatic bed of a single structure and a confined aquifer of a multi-layer structure, and the occupied area of a drill hole and the construction cost can be effectively saved.

According to an underground water stratified sampling device and the using method thereof, impurities can be prevented from being attached to the outer side of a filtering structure through rotation of an external structure, the problem of blockage of filtering holes is effectively solved through cooperation with a mesh blockage clearing structure, the normal water pumping efficiency during sampling is guaranteed, and meanwhile through a sampling mode of time division mistake, permeated mixed groundwater is conveniently isolated after comparison and sampling quality is ensured. The device is characterized in that the cross section of a lifting mechanism is triangular, a traction rope is arranged in the lifting mechanism through a pulley, one end of a connecting rod is fixedly arranged at the end of the traction rope, an upper sealing air bag is arranged in the middle of the connecting rod in a penetrating mode. A pressurizing air pipe is fixedly arranged at the top of the upper sealing air bag, a fixing plate is fixedly arranged at the other end of the connecting rod and is of a circular plate-shaped structure, at least six electric expansion pieces are circumferentially arranged at the bottom of the fixing plate, the bottoms of the electric expansion pieces are connected with a sampling barrel through piston rods, and the sampling barrel is hollow.

The invention relates to the technical field of marine organism qualitative and quantitative stratifying and global change studying argillaceous sampling quantitative stratifying in marine geology, in particular to a pushing-type quantitative stratified sampling apparatus and an application method thereof. The pushing-type quantitative stratified sampling apparatus is composed of a stratified sampling unit and a sampling tube. The stratified sampling unit comprises a handle, a fixing screw knob, a detachable fixing frame, a pulling rod and a piston. The handle is arranged at the top end of the pulling rod, the piston is connected to the bottom end of the pulling rod, and the detachable fixing frame is installed on the pulling rod between the handle and the piston in a relative moving mode; and the sampling tube for performing sampling is sleeved outside the pulling rod and connected with the detachable fixing frame, and the fixing screw knob is arranged on the pulling rod between the handle and the detachable fixing frame and detachable in position. The pushing-type quantitative stratified sampling apparatus has the advantages that the structure is simple, the manufacture cost is low, materials are saved, energy is not used, the sampling apparatus is not limited by environments, and samples can be stratified accurately.

The invention relates to the field of chemical engineering, and relates to a control system of a solid garbage degradation device. The control system of the solid garbage degradation device comprises a garbage gas stratified sampling device, an automatic garbage gas sampling device, a garbage gas analyzer, a water supply pipe, a water injection pump, a ground penetrating radar, a water content controller and a central processor, wherein the water supply pipe is provided with a plurality of water through holes, and is arranged in a garbage dump; the water injection pump is connected with the water supply pipe; the ground penetrating radar is connected with the input end of the water content controller; the output end of the water content controller is connected with the water injection pump; and the central processor is connected with the garbage gas analyzer, the water content controller, and a gas extracting pump and a gas injection pump in the garbage dump respectively. The control system of the solid garbage degrading device provided by the invention not only can monitor gas content in a garbage degradation reaction process, but also can monitor the water content; and the control system provided by the invention achieves the aim of improving the degradation efficiency through controlling more conditions in the garbage degradation reaction process.

The invention relates to intelligent soil stratified sampling equipment, comprising a sampling pipe body and a power unit arranged on the sampling pipe body, a collecting pipe is arranged in the sampling pipe body, the collecting pipe is uniformly provided with at least one collecting bin in the axial direction, the sampling pipe body is provided with at least one sensor corresponding to the collecting bin as well as an opening and closing device, under the condition that the sampling pipe body moves into soil under the action of the power unit, a central processing unit can generate an acquisition signal, used for controlling the opening and closing device to be opened and/or closed, according to soil parameters acquired by the sensor. The intelligent soil stratified sampling equipment provided by the invention has the advantage that a sensor and an opening and closing device are correspondingly arranged on each collecting bin in the collecting pipe, parameters, used for physical analysis, of target soil can be accurately and effectively acquired by virtue of the sensor, the effect that each collecting bin can accurately collect target soil in a preset soil parameter interval is guaranteed, and the effect that parameters, used for the physical analysis, of soil in each collecting bin are different or can not be partially coincided is guaranteed.

The invention relates to a water sample extracting device, a manufacturing method thereof and a using method thereof. The invention aims to provide the water sample extracting device for environment detection which can perform stratified sampling, can regulate the distance between sampling personnel and a sampling point and is high in sampling speed. The device comprises an inserting rod, a sleeve, a nut, a screw rod, a first motor, a winding wheel, a pulling rope, a guide wheel and the like; the sleeve is arranged on the outer side of the inserting rod in a sleeving manner; the nut is mountedon the sleeve in an embedded manner; the screw rod is arranged in the nut; the screw rod is matched with the nut; the first motor is mounted on the left side of the top of the inserting rod; the winding wheel is arranged on the front side of the first motor; the pulling rope bypasses the winding wheel; the guide wheel is arranged at the left end of the inserting rod. According to the water sampleextracting device for the environment detection, water sampling depth is controlled by adopting a floating ball, and the distance between the sampling point and the sampling personnel can be controlled conveniently through the inserting rod and the sleeve.

The invention provides an on-line aggregation method of multi-table connection based on Markov chain, includes two phases: sample creation and online gathering, At that sample creation stage, Create ahierarchical sample of the original dataset in conjunction with load characteristics, The hierarchy is based on the grouped column set in the query load, so that the probability of the column set appearing in the load and the probability of the grouped column set being covered in the load are maximized. Based on the determined grouped column set and the distribution of the index, the join order of each table is determined, and the hierarchy sample is created at the running start of the Markov chain. In the online aggregation stage, the multi-table join query statement submitted by the user isparsed, the samples with the lowest query cost are dynamically selected for stratified sampling, the size of samples extracted from each sample layer is determined, and the query result and the confidence interval are further estimated.