42results about How to "Reduce experimental risk" patented technology

The invention provides a testing-tube operation system convenient for individual taking and placement. The testing-tube operation system comprises a clamping device, a transmission device and a flatly taking device, wherein the transmission device comprises a control box, a transmission rod, a forward and reversal motor and a time relay; the time relay is connected with the forward and reversal motor by a circuit; an output shaft of the forward and reversal motor is connected with an input shaft of the control box in a driving manner; an output shaft of the control box is a transmission rod; the far end of the transmission rod is provided with a gear structure which is meshed with a gear at the lower section of a driving rod in the clamping device; the driving rod in the clamping device is of a three-section structure including an upper section, a middle section and a lower section, wherein a lead screw is arranged at the upper section, a nut on the lead screw is sheathed into a horizontal gear of an operation wheel group, a gear is horizontally arranged on a lower-section rod and is meshed with a gear at the end part of the transmission rod, the middle section and the upper section are connected by a sheathing bearing, and the middle section and the lower section are connected by a reversal gear group; and the flatly taking device is arranged above the clamping device.

The invention provides a multi-unit miniature modularized reactor control system experimental apparatus and an experimental method thereof, and belongs to the field of nuclear reactor control. The experimental apparatus comprises the following components: a nuclear steam supply system simulator which comprises a higher water tank, a lower water tank, a main water tank, a water pump, an inlet valve, a water outlet valve, and a pipeline; a mother pipe simulator which comprises a main pipe and several draining units; and a main control bench which comprises a data acquisition module, a signal output module, a master control computer and related lines; the invention also provides the experimental method of the experimental apparatus. The experimental apparatus in the condition with low parameter and without irradiation can simulate and analyze dynamic characteristics of the multi-unit miniature modularized reactor system, and design and verify corresponding control schemes.

The present invention relates to the technical field of medical testing, in particular to a method for measuring the concentration of phenylephrine by LC-MS / MS, which includes one extraction: adding an internal standard working solution and an extracting solution to the sample, mixing them uniformly and then centrifuging and stratifying , collect the supernatant to obtain the first supernatant; derivation reaction: after the first supernatant is concentrated and dried, add NaHCO 3 The buffer salt is dissolved, and then the acetonitrile solution of dansyl chloride is added to carry out the derivatization reaction; secondary extraction: adding the extract solution to the reaction solution after the derivatization reaction for secondary extraction, centrifuging to obtain the second supernatant, and the second supernatant After the liquid is concentrated and dried, it is redissolved to obtain a sample solution; the sample pretreatment method of the present invention can maximize the extraction rate of the low-content phenylephrine by the pretreatment method, effectively remove the interference of the plasma matrix, and improve the specificity. The minimum detection limit is reduced to 0.02ng / ml, and the sensitivity is increased to 0.1nM, so as to adapt to the detection requirements of low-concentration phenylephrine in drug clinical research.

The invention relates to a surveymeter for parallelism of optical axis of visible and infrared light wave, comprising an infrared light part and a visible light part. Firstly, aiming is operated by employing visible light, the visible light emitted by a visible light source lightens up a cross wire by a cross-linegraticule, an emergent visible cross wire image is formed on a visible light CCD, after being reflexed by an infrared beam splitter, a secondary mirror, a primary mirror and a standard flat mirror, the emergent visible light returns to the visible light CCD by the optical devices andforms a return cross wire image, and a system is adjusted to superpose the emergent visible cross wire image and the return cross wire image, thereby completing instrument aiming. Then infrared lightis employed for detecting, iraser emitted by an infrared laser passes through a series of optical elements of the infrared light part, and an emergent infrared spot and a return infrared spot on an infrared CCD are extracted by measurement software. Error value of the parallelism can be obtained by formula computing. The surveymeter of the invention adopts the visible light to aim and the infrared light to detect the parallelism error, thereby reducing experiment risk while improving measurement precision.

The present invention provides a method which adopts double quartz tubes to prevent the sample from being oxidated, which relates to the method which can prevent the sample from being oxidated. The method comprises the steps as follows: (1) the sample is placed in a small diameter quartz tube with one end sealed; the other end is neck-sheared by flame and is connected with a rotary sheet vacuum pump; after 30 to 40 minutes of vacuum pumping, the shear neck is sealed quickly by flame. (2) The sealed small quartz tube is placed in a big diameter quartz tube with one end sealed; the other end istreated by neck-shearing by flame, so a double layer of quartz tubes is formed. (3) The neck sheared big diameter quartz tube is connected with the rotary sheet vacuum pump; the vacuum pump is started; after 5 to 8 seconds of vacuum pumping, the sheared neck is sealed quickly by flame. Compared with the traditional high temperature heating oxidation preventing method, the present invention is of simple and easy experiment operation, lower experiment expense, lower experiment risk and higher experiment efficiency.

The invention discloses an experiment table for testing a hydraulic servo system. The experiment table comprises a base, a first differential hydraulic cylinder driving unit, a second differential hydraulic cylinder driving unit, a third support lug, a fourth support lug, a sliding table and a supporting rod, wherein the first differential hydraulic cylinder driving unit and the second differential hydraulic cylinder driving unit are symmetrically fixed on the base along the longitudinal direction; the third support lug and the fourth support lug are used for fixing the first differential hydraulic cylinder driving unit and the second differential hydraulic cylinder driving unit on the base respectively; the sliding table is positioned between the first differential hydraulic cylinder driving unit and the second differential hydraulic cylinder driving unit; the sliding table is connected with the first differential hydraulic cylinder driving unit and the second differential hydraulic cylinder driving unit respectively through a first connecting block and a second connecting block; the supporting rod penetrates the side central position of the sliding table along the transverse direction; and loads are arranged on the supporting rod and on the two sides of the sliding table. When the experiment table is used for performing hydraulic pressure servo control experiment research and hydraulic system position servo control research, an experiment on an actual heavy-load big-inertia equipment mechanical system can be moved to a lab, so that the experiment cost and risk can be largely reduced.

Provided is a detection method for silica separation performance of a filter element of a nuclear power plant water filter. The detection method is the laboratory detection method that the filter element of the nuclear power plant water filter is simulated to determine separated silica in a working state and comprises the steps that a detected filter element is installed in a detection system pipeline, an experimental medium is sampled and submitted for detection regularly under the condition that the experimental medium passes through the filter element at rated flow and the maximum working temperature is kept, whether silica separated out from the filter element exceeds the standard or not is judged through analysis on detection data after detection, and detection is conducted according to the standard of SL 91.2-1994 'determination of silica (dissolved) (hetropoly blue method)'. According to the detection method, simulative detection on silica separated out from the filter element of the nuclear power plant water filter can be achieved at the rated flow at the maximum working temperature in the state that ingredients of the filter element approach to those of the working medium. Therefore, specific running parameters of the filter element can be acquired under the approximate real working condition, the verification efficiency of the filter element performance is improved, and a risk influence of a new filter element product on the running safety of a nuclear power system is reduced.

The invention provides a test tube clamping device. The test tube clamping device comprises clamping rings, a tensioning belt, a movable block and a supporting rod, wherein each clamping ring is an arc-shaped semi-ring with an angle smaller than 150 degrees, and the two clamping rings are arranged; the two clamping rings are arranged horizontally and oppositely; the movable block is arranged between edge end parts of the two clamping rings and is close to rear ends of the two clamping rings; the supporting rod is vertically arranged; the movable block is movably fixed at the bottom of the supporting rod; the movable direction of the movable block is vertical to the radial direction of the supporting rod; and the tensioning belt is fixed at the rear ends of the clamping rings and is arranged along the inner sides of the clamping rings, and the movable block is arranged toward one side of the supporting rod. Non-manual operation of separately taking tubes in a sterile environment is realized through a pure mechanical, low-cost and easily-maintaining manner and is stable and reliable; experiment risks can be effectively reduced, and disinfection and sterilization resources are solved; and the test tube clamping device is simple in structure and easy to maintain, and provides reliable guarantees to large-batch strain experiments of middle-size and small-size enterprises.