8 results about "Shear stress" patented technology

A process for forming a nano-composite including mixing a first and second thermoplastic polymer in a molten state forming a molten polymer blend. The second polymer is soluble in a first solvent and the first polymer is insoluble in the first solvent. The first polymer forms discontinuous regions in the second polymer. Next, the polymer blend is subjected to extensional flow, shear stress, and heat forming nanofibers where less than about 30% by volume of the nanofibers are bonded to other nanofibers.

Next the polymer blend with nanofibers is cooled and the first intermediate is formed into a pre-consolidation formation. The pre-consolidation formation is then consolidated causing nanofiber movement, randomization, and at least 70% by volume of the nanofibers to fuse to other nanofibers. According to one aspect, the second intermediate is then subjected to the first solvent to the dissolving away at least a portion of the second polymer.

According to an exemplary embodiment, a method for coupling a mechanical interface unit (34) to a suction ring unit (16) that is held on an eye by suction force comprises a step of bringing the interface unit relatively closer to the suction ring unit in an axial direction, into a first predetermined relative position of the two components that is preferably detected by suitable sensors. When the first relative position is reached, the evacuation of a suction chamber (42) formed between the interface unit, the suction ring unit and the surface of the eye is commenced, the negative pressure produced in the suction chamber establishing a contact between the surface of the eye and an applanation plate (40) held on the interface unit, or increasing the size of a region of existing contact. The sucking of the eye onto the applanation plate prevents the eye from being subjected to compressive and shearing stresses such as those that are often unavoidable when the plate is pressed against the eye.

The invention discloses a blood pressure measurement method and system. The method comprises the following steps that a blood pressure measurement expression with correction factors is set according to the relationship between shear stress and the blood flow velocity V; characteristic parameters of the blood flow velocity V of a measured object are obtained, meanwhile the blood pressure reference value of the measured object is directly collected through a pressure gauge, and inverse calculation is conducted on the blood pressure measurement expression to obtain a correction factor value; when the practical blood pressure measurement is conducted, the correction factor value of the corresponding measured object is read from a database, and the blood pressure measuring result is calculated on the basis of the blood pressure measurement expression and the characteristic parameters, collected in real time, of the blood flow velocity. The blood pressure measurement method and system are simple, safe, convenient in test, and can achieve remote real-time monitoring of the blood pressure of the user, are good in real-time detection performance, can cope with various accidents of sudden illness of a blood-pressure-disease patient timely, eliminate the damage to the human body by a traditional direct measurement method, store the correction factors and characteristic constant values of the different measured objects for blood pressure calculation, and are high in measurement accuracy.

The invention provides an intertidal zone sediment incipient motion measuring device and method. The device is composed of an upper structure, a lower structure and a fixed bracket. The upper structure is disposed over the lower structure, and is composed of a sleeve mandrel, an inner cylinder and an outer circle. The sleeve mandrel comprises an inner shaft and an outer shaft. The inner shaft is connected with the inner cylinder. The outer shaft is connected with the outer cylinder. An annular groove between the inner cylinder and the outer cylinder is fully filled with water. The lower structure is placed on a mud beach surface. The water in the annular groove between the inner cylinder and the outer cylinder is in contact with the mud beach surface. The fixed bracket is provided with a motor for driving the inner shaft and the outer shaft to rotate. The inner shaft and the outer shaft are rotated by the motor at the optimal speed ratio in order to drive the water in the annular groove between the inner cylinder and the outer cylinder to flow so as to produce uniform shear stress on the mud beach surface. Sediment incipient motion is determined when the turbidity of the water in the annular groove suddenly increases, and at this time, the critical shear stress of the sediment incipient motion of the beach surface can be obtained according to the rotation speed of the inner andouter cylinders.

The invention provides a composition for eyes and having improved drying protection and retention, and belongs to the field of pharmaceutical preparations. The composition includes cyclosporin, nano micelle in-situ gel, and hyaluronic acid or a pharmaceutically acceptable salt thereof; and the composition is in a liquid form at normal temperature or low temperature, is a hydrosol form when the temperature is more than 35 DEG C, and can still maintain complete under the shear stress caused by the eyelid blinking of patients. A preparation method includes providing first solute and second solute; and mixing the solute under a condition of taking water as a substrate so that the composition including gel dispersoid can be formed. The provided composition is high in bioavailability and small in effect on eye pain and irritation, cannot cause the blurring of vision, can improve the compliance of the patients and/or reduce side-effects, can enhance ocular surface health, and has antibacterial and antiseptic effects; and the preparation method can increase adhesiveness, enhance gelation temperature, prolong retention and effective acting time, rising encapsulation yield, avoid self-agglomeration phenomenon, and enhance antioxidant protection effects and stability performance.

The invention discloses a soil-rock interface original sample torsional shear test device, comprising a bearing frame in which a sample fixing unit is arranged; a normal stress loading unit is arranged above the sample fixing unit; an annular shear unit is arranged on the lateral side of the sample fixing unit; the sample fixing unit comprises a sleeve, a sample and a rock plate; the sample is placed into the sleeve that is placed on the rock plate; a fixed shaft rod at the bottom of the bearing frame penetrates through the rock plate, and the sleeve stretches into the sample; the normal stress loading unit comprises a force transferring plate, a jack, a pressure sensor and a cushion plate sequentially arranged on the sleeve; the annular shearing unit comprises a worm and gear mechanism installed on the sleeve. According to the soil-rock interface original sample torsional shear test device provided by the invention, the torsional shear test of the in-situ sample can be performed, andmeanwhile, the non-uniform distribution of the shearing stress on the shearing surface can be avoided.

The invention relates to a hydrolysis saccharification process of alternanthera philoxeroides. Metal substance pollutants (iron, cobalt and nickel) in alternanthera philoxeroides raw materials are absorbed by adopting magnetic force, so that subsequent mechanical abrasion and contents of metal ions in treating fluid are reduced, and a good fermentation condition is created for detoxification of selected cupriavidus metallidurans; then solid-liquid separation is realized by adopting an extrusion method, hydrolysis on lipids and protein contained in liquid-state materials is carried out by adopting an NaOH solution, and then hydrolysis treatment is further carried out by adopting trypsase, so that the hydrolysis is more completely carried out; meanwhile, extruded solids are dried and crushedand then dropped into a sulfuric acid solution to carry out acidolysis; through electrorheological fluid shear stress effect treatment, cellulase is then added and enzymatic treatment is carried out,so that the effect is good and energy consumption is low. According to the hydrolysis saccharification process of the alternanthera philoxeroides disclosed by the invention, the raw material treatment efficiency is improved to the maximum extent, and finally, saccharified hydrolytic solutions rich in nutrient substances such as glucose, amino acid, small molecule chain lipids and the like are obtained, so that the glucose content is high, and the glucose can be conveniently supplied for further fermentation, and the production efficiency is improved.

The invention relates to the technical field of metallurgy, in particular to a method for prolonging the service life of a KR stirring head. The method comprises the steps that 1, the ratio of the length of blades of the KR stirring head to the diameter of a hot metal ladle is controlled to be 0.35-0.45, and the ratio of the area of the surface facing iron of the blades of the KR stirring head to the area of the longitudinal section of the hot metal ladle is controlled to be 0.10-0.12; 2, before entering hot metal to be stirred, the KR stirring head is controlled to be baked for 5-20 min above the hot metal ladle; and 3, in the desulfurization process, the maximum rotating speed of the KR stirring head is controlled to be 70-100 rpm, and the ratio of the immersion depth of the KR stirring head to the depth of the hot metal is controlled to be 0.35-0.50. According to the method for prolonging the service life of the KR stirring head provided by the embodiment of the invention, the interior of the KR stirring head is prevented from producing cracks on the premise that efficient desulfurization is ensured, the shearing stress on the KR stirring head is reduced, and the service life of the KR stirring head is prolonged.