253results about How to "Stable baseline" patented technology

The invention relates to a design method for the formation configuration of distributed satellites with synthetic aperture radars (SAR). The method comprises the following five operation steps: step 1: designing the formation configuration of the distributed satellites and conforming fly-by path equations; step 2: confirming an optimal base line length range of the distributed satellites in start time; step 3: confirming an optimal base line sequence of the distributed satellites in start time; step 4: confirming track parameters of the formed satellites forming a concentric circle configuration; and step 5: calculating effective base lines and vertical path base lines in a track period. The invention provides the concentric circle formation configuration, uses the optimal base line combined constraint conditions of multi-base line interference SARs as design input parameters and designs a control law of radar antenna visual angles to realize that a distributed satellite SAR system can satisfy the design requirements of the optimal base line combined constraint conditions in any time in a track operation period and a basis is provided for the distributed satellite SAR system to obtain high-precision DEM products by a multi-base line interference SAR treatment method.

Methods and systems for spectrometer dark correction are described which achieve more stable baselines, especially towards the edges where intensity correction magnifies any non-zero results of dark subtraction, and changes in dark current due to changes in temperature of the camera window frame are typically more pronounced. The resulting induced curvature of the baseline makes quantitation difficult in these regions. Use of the invention may provide metrics for the identification of system failure states such as loss of camera vacuum seal, drift in the temperature stabilization, and light leaks. In system aspects of the invention, a processor receives signals from a light detector in the spectrometer and executes software programs to calculate spectral responses, sum or average results, and perform other operations necessary to carry out the disclosed methods. In most preferred embodiments, the light signals received from a sample are used for Raman analysis.

Methods and systems for spectrometer dark correction are described which achieve more stable baselines, especially towards the edges where intensity correction magnifies any non-zero results of dark subtraction, and changes in dark current due to changes in temperature of the camera window frame are typically more pronounced. The resulting induced curvature of the baseline makes quantitation difficult in these regions. Use of the invention may provide metrics for the identification of system failure states such as loss of camera vacuum seal, drift in the temperature stabilization, and light leaks. In system aspects of the invention, a processor receives signals from a light detector in the spectrometer and executes software programs to calculate spectral responses, sum or average results, and perform other operations necessary to carry out the disclosed methods. In most preferred embodiments, the light signals received from a sample are used for Raman analysis.

This invention relates to a fully differential non-inverting parallel amplifier for detecting biology electrical signal, including input buffer circuits, differential filter circuits, data selector, non-inverting parallel amplifying circuits and analog-digital circuits. The biology electrical signal, first impeded and converted by the input buffer circuits, and then low-pass filtered by the differential filter circuits, shall be amplified with its common mode signal rejected by passing through the data selector and non-inverting parallel amplifier circuits. At last, the amplified biology electrical signal is output by analog to digital conversion in the analog-digital circuits after its noises beyond signal high frequency band are filtered by anti-aliasing filter net. This invention, with low noise and high common mode rejection ratio, stable baseline, large signal input dynamic range, is reliable and not easy to be saturated. Furthermore, it can support mature PACE Detecting with a low cost. It is notable in social and economical benefits for its simple electrical circuits and easy use in any biology electrical testing equipments and controlling system.

The invention discloses a method for establishing a lonicerae and forsythiae powder UPLC fingerprint spectrum.The method can quickly and accurately identify authenticity and merits of a product and has the advantages of simplicity, convenience, stability, high precision, good repeatability and the like.By means of the method, kinds and quantity of chemical components contained in lonicerae and forsythiae powder can be comprehensively reflected, global description and evaluation are conducted on the quality of the lonicerae and forsythiae powder, the quality and the medicine effects of the lonicerae and forsythiae powder are truly combined, which is conductive to illuminating the function mechanism of the lonicerae and forsythiae powder, and a basis is provided for technical promotion and deep development of the lonicerae and forsythiae powder.By means of the method, the number of the chemical components detected in the lonicerae and forsythiae powder fingerprint spectrum is relatively large, characteristic peak height proportions are moderate, a base line is stable, and the separation degree, peak shapes and column efficiency are good.

The patent refers to the field of 'pharmaceutical preparations'. The invention discloses a quality analysis method of compound Ganmaoling tablets. In the method, high-performance liquid chromatography (HLPC) is used for measure the chlorogenic acid content, acetaminophen content and caffeine content of the compound Ganmaoling tablets, test product solution is prepared and reference product solution is prepared and measured. The quality analysis method of the invention can detect the acetaminophen, chlorogenic acid and caffeine components under the same color spectrum condition at the same time, so the test time and cost are saved and the working efficiency is improved; the test method has high sensitivity, high separating degree; the basic line is stable; a negative reference is not affected; and the accuracy, repeatability, linearity and stability of the test method meet scientific research and production requirements, and the detection method is suitable for promotion and application.

The invention discloses a full-differential same-phase parallel amplifying device for acquiring a bioelectric signal. The amplifying device comprises an input buffer circuit, a differential filtering circuit, a data selector, a same-phase parallel amplifying circuit and an analog-digital conversion circuit which are connected sequentially. The input buffer circuit performs impedance conversion on the bioelectric signal first; the bioelectric signal subjected to low-pass filtering by the differential filtering circuit passes through the data selector and the same-phase parallel amplifying circuit; the bioelectric signal is amplified and a common-mode signal is suppressed; the noise of the bioelectric signal outside a signal high-frequency band is filtered through an anti-aliasing filtering network; and the amplified signal is subjected to analog-digital conversion by the analog-digital conversion circuit and then is output. The noise and common-mode suppression ratio can reach a high index, a base line is stable, a dynamic signal input range is wide, signals are difficult to saturate, and the device has high in reliability and can support perfect PACE detection. Meanwhile, the circuits are simple and are low in cost, and the device can be used for various bioelectric detection instruments and systems and has obvious economic benefit.

The invention relates to a method for simultaneously detecting multiple sugars and sugar alcohols in food. An HPLC-differential refraction detection method is adopted as the method; the method is characterized by comprising the HPLC chromatographic conditions that an amide-bonded column is adopted as a chromatographic column, single mobile phases of acetone, water and triethylamine are adopted as mobile phases, isocratic elution is performed, the column temperature is 70 DEG C, the flowing velocity is 0.8 ml/min, and the sample injection amount is 10 milliliters. The detection method can be suitable for the food such as honey, wine and baijiu; detection can be performed only by simply processing a sample, the method is rapid, high in recovery rate, wide in linear range, good in correlation coefficient and low in detection limit, and the blank of simultaneous detection on the sugars and sugar alcohols in the food in China is filled up.

The invention relates to a fingerprint spectrum detection method for meridian warming decoction. The method comprises the following steps: 1) preparing a test solution; weighing 1-2g of angelica sinensis, 1-2g of ligusticum wallichii, 1-2g of radix paeoniae alba, 1-2g of cinnamon, 1-2g of moutan bark, 1-2g of curcuma zedoary powder, weighing 3-4g of ginseng powder, 3-4g of liquorice powder and 3-4g of radix achyranthis bidentatae powder; adding 250-350mL of water, uniformly mixing, heating to boil with strong fire, slowly decocting with slow fire, filtering while the decoction is about 150-170mL, and adding water into the filtrate to dilute to 240-260mL; precisely sucking 8-12mL of the standard decoction of the meridian warming decoction, adding methanol to dilute to 40-60mL, sealing, weighing the mass, carrying out ultrasonic (the power is 180-220W and the frequency is 40-60kHz) treatment for 8-12min, standing overnight, weighing the mass again, supplementing the lost mass with methanol, uniformly shaking, filtering, and taking the subsequent filtrate, thereby obtaining the test solution; 2) detecting: taking and injecting 5-15 [mu]L of the test solution obtained in the previous step into a high performance liquid chromatograph, and obtaining a chromatogram; and 3) performing result judgment: comparing the chromatogram obtained in the previous step with a standard control fingerprint, and if the similarity is greater than 90%, the sample being qualified.

The invention relates to a fingerprint detection method for Shenshuaining granule. The detection method employs HPLC for detection, and comprises the following steps: a, determining chromatographic condition; b, preparing a tested object solution; and c, establishing fingerprint. The chromatographic conditions in the step comprise that the chromatographic column is C18 chromatographic column; the mobile phase comprises a mobile phase A and a mobile phase B with the ratio of 5%:95%-100%:0%, the mobile A is acetonitrile or methanol, and the mobile phase B is water, a phosphoric acid aqueous solution with the concentration of 0.01%-0.5% or a formic acid aqueous solution with the concentration of 0.01%-0.5%; the detection wave length is 190-450 nm; the column temperature is 20-40 DEG C; the volume flow is 0.8-1.2 mL/min; the sample size is 5-100 mu L; and the elution program employs gradient elution and the elution time is 80-100 min. The detection method is simple, rapid, easy to operate, high in precision, good in stability and good in reappearance, possesses many characteristic peaks, and can well provide quality control basis for production of Shenshuaining granule.

The invention provides a cigarette flavoring uniformity detection method based on an additional marker. The method comprises the following steps: adding a phenylethanolate compound serving as an additional marker into a tobacco essence, wherein the tobacco essence containing the additional marker is added to tobacco shreds through a flavoring process, balancing, grinding and sieving different batches of flavored cut tobaccos, performing accelerated solvent extraction to respectively obtain extract liquor of different batches of cut tobaccos, performing gas chromatography-tandem mass spectrometry analysis on the extract liquor to obtain the content of additional markers in a plurality of extract liquor, and further conducting calculation to obtain the flavoring uniformity of cigarettes. According to the cigarette flavoring uniformity method based on the additional marker, compounds except essence and tobacco shred components are selected as the additional marker, the uniformity of the cigarette flavoring process can be evaluated more objectively, scientifically and accurately in a quantified mode, and the method has very important significance in evaluating the tobacco shred makingprocess and stabilizing the product quality.

The invention relates to a method for simultaneously detecting multiple sugars and sugar alcohols in dairy products. The method is an HPLC-RID (high performance liquid chromatography-refractive index detection) method and is characterized in that the chromatographic condition of HPLC is as follows: an amido bond column is adopted as a chromatographic column, a single mobile phase of acetone, water and trithylamine is adopted, and isocratic elution is performed; the column temperature is 70 DEG C; the flow velocity is 0.8 ml/min; the sample size is 10 mu L. The detection method is applicable to the dairy products such as milk, cakes, candy, milk powder and the like. Detection can be performed after samples are treated simply. The method is quick, high in recovery rate, wide in linear range, good in correlation coefficient and low in detection limit and fills up the blank of simultaneous detection of the sugars and the sugar alcohols in the dairy products.

The invention discloses an Fmoc-protected amino acid purity and related substance analysis method. The method comprises the following steps of S1, preparing an Fmoc-Osu impurity control solution, andenabling the ratio of Fmoc-Osu to Fmoc-protected amino acid to be (0.1-1.0): 100 to obtain an Fmoc-Osu impurity control solution; S2, preparing a related impurity control solution, enabling the ratioof single related impurity to Fmoc-protected amino acids to be 0.1-1.0: 1 100, obtaining a plurality of reference substance solutions, etc. According to the invention, a mobile phase, an impurity control solution and the gradient elution conditions are comprehensively designed and optimized, the analysis method is applied to the operation process of the system, the baseline is smooth, no interference peak basically exists in a blank test, the impurity separation effect is prominent, and the specificity is good. The test data shows that the detection limit can achieve 0.002%, the sensitivity isextremely high, the detection result can provide the reliable and effective information for the research, the production and the purification of the product, the solid foundation is established for the protected amino acid quality control standard, and the positive effect is provided for the quality control of the final product.

The invention discloses a method for detecting ingredients of Mailuoning oral liquid for clearing heat, nourishing yin, activating blood circulation and removing blood stasis. The method comprises thefollowing steps: performing HPLC detection on a Mailuoning oral liquid test solution and a standard solution, wherein the chromatographic conditions are as follows: a C18 chromatographic column, anda column temperature of 25-40 DEG C; using methanol as a mobile phase A, using an aqueous acid solution as a mobile phase B, performing gradient elution, recording a chromatogram, calculating the similarity of a test sample by using similarity software with a fingerprint of the Mailuoning oral liquid as the reference, wherein the fingerprint of the test sample should be similar with a standard fingerprint; and calculating the contents of the ingredients in the Mailuoning oral liquid by using an external standard one point method. The method disclosed by the invention has good precision, linearrelationship, stability, repeatability, high recovery rate and good durability; the method disclosed by the invention has the advantages of good degree of separation and reproducibility of the fingerprint of the Mailuoning oral liquid, and comprehensive information, 21 common peaks are marked in total, the similarity of each batch of samples is above 0.95, and the quality of the Mailuoning oral liquid can be evaluated comprehensively, objectively and scientifically.

A method and apparatus for detection of pteridine levels in a biological sample using CE-LIF which is useful for early cancer screening involving fully oxidizing pteridine compounds in a sample such as a urine sample, subjecting to CE-LIF to assess compound concentration, and compare to expected levels in for healthy or cancer-bearing patients.

The invention belongs to the field of medical domestic fungus analysis and detection and relates to a method for simultaneous detection of guanosine, uridine and adenosine in Morchella esculenta by HPLC. The method comprises adding water into Morchella esculenta powder, carrying out constant temperature ultrasonic extraction, carrying out full shaking, taking the supernatant, filtering the supernatant through a water filter head, carrying out standing to obtain a sample solution to be detected, preparing a nucleoside reference solution and detecting nucleoside components in Morchella esculenta through HPLC. The method for detecting nucleoside components in Morchella esculenta has high stability, good repeatability and a good precision, produces a reliable and convenient result and can provide scientific basis for quality control of Morchella esculenta.