摘要:
This invention pertains to materials and methods relating to the biological fixation of one tissue type to another different tissue type, i.e., the fixation of cartilage to bone. A scaffold apparatus for osteochondral tissue engineering is described. The apparatus comprises regions of varying matrices which provide a functional interface between multiple tissue types. Further, a method for preparing the scaffold apparatus is provided. Methods for treating osteochondral tissue injury and cartilage degeneration using the scaffold apparatus are also described. In addition, a method for evaluating cell-mediated and scaffold-related parameters of development and maintenance of multiple tissue zones in vitro is described.
摘要:
The present invention relates to an andrographolide derivative of the formula (I), wherein R1, R2 and R3 are same or different substituents selected from hydrogen, substituted or unsubstituted organic acid radicals, inorganic acid radicals, alkyl, aryl or heteroaryl, and at least one of R1, R2 and R3 is R-lipoic acid, S-lipoic acid or a mixture thereof, or corresponding dihydrolipoic acids thereof, or N-acetylcysteine radical. The derivative has good antitumor effect, can induce apoptosis of tumor cells, can directly kill Gram-positive bacteria (staphylococcus aureus) and drug resistance bacteria (MRSA5676 and MRSA5677), can inhibit the QS-system of Gram-negative bacteria (Pseudomonas aeruginosa), can inhibit and destroy the formation of biofilm of Pseudomonas aeruginosa; and exhibits significant hypoglycemic effect, so that it can be used in manufacture of medicaments for treatment of cancers, inflammation, diabetes, and bacterial and viral infections.
摘要:
The present invention provides novel nitrones, their preparation and use. The novel compounds have the following formula: I The compounds of the present invention have strong antioxidative activity, and are thrombolytic. These compounds can be used to treat and/or prevent diseases caused by overproduction of free radicals and/or formation of thrombus.
摘要:
An x-ray detector is provided for use in imaging systems. The x-ray detector includes a detector subsystem configured to output electrical signals in response to reception of x-rays. The detector subsystem includes an imaging panel, a support layer and a low density core disposed between the imaging panel and the support layer.
摘要:
An x-ray detector is provided for use in imaging systems. The x-ray detector includes a detector subsystem configured to output electrical signals in response to reception of x-rays. The detector subsystem includes an imaging panel, a support layer and a low density core disposed between the imaging panel and the support layer.
摘要:
A clearance measurement system is provided. The clearance measurement system includes a reference geometry disposed on a first object having an otherwise continuous surface geometry and a sensor disposed on a second object, wherein the sensor is configured to generate a first signal representative of a first sensed parameter from the first object and a second signal representative of a second sensed parameter from the reference geometry. The clearance measurement system also includes a processing unit configured to process the first and second signals to estimate a clearance between the first and second objects based upon a measurement difference between the first and second sensed parameters.
摘要:
A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.
摘要:
The disclosure relates to a rapid and high precision centroiding method for spots image comprising the following steps. First, the method requires convoluting the gray value of a pixel with a Gaussian filter and judging whether the result thereof exceeds a predetermined threshold. If the value exceeds the predetermined threshold, the method requires marking the current pixel with a flag to identify which spot it belongs to, and then accumulating the product of the gray value and a coordinate value of the same spot; and at the same time, accumulating the gray value of the same spot; and saving the results of the accumulation respectively. If the gray value of the pixel does not exceed the predetermined threshold, the method requires marking the current pixel as a background flag. After all pixels of the image has been disposed of completely, the method includes calculating a quotient of the accumulations of the product of the gray value and the coordinate value and the accumulations of the gray value, and outputting the quotients. At the same time, a centroiding system for spots image is also presented.
摘要:
A method for calibration of a digital celestial sensor is disclosed. First, an integrated mathematic model for imaging of a celestial sensor is established according to external and internal parameters of the calibration system of the celestial sensor. Second, by rotating two axes of a rotator by different angles, calibration points data are acquired and sent to a processing computer through an interface circuit. Finally, a two-step calibration program is implemented to calculate the calibration parameters by substituting calibration points' data to the integrated mathematic model. An application device of the calibration method is also provided. The device may include a celestial simulator to provide simulated sunlight or starlight, a two-axis rotator to acquire different calibration points' data, and a processing computer to record the calibration points' data and calculate the calibration parameters.
摘要:
The disclosure relates to a signal processing method for multi aperture sun sensor comprising the following steps: reading the information of sunspots in a row from a centroid coordinate memory, judging the absence of sunspots in that row, identifying the row and column index of the sunspots in the complete row, selecting the corresponding calibration parameter based on the row and column index, calculating attitude with the attitude calculation module the corresponding to identified sunspots, averaging the accumulated attitude of all sunspots and outputting the final attitude. At the same time, a signal processing device for multi aperture sun sensor is also presented. It is comprised of a sunspot absence judgment and an identification module and an attitude calculation module. The disclosure implements the integration of sun sensors without additional image processor or attitude processor, reduces field programmable gate array resource and improves the reliability of sun sensors.