Abstract: A bulk acoustic wave resonator and a formation method thereof are provided. The method for forming the bulk acoustic wave resonator includes forming a sacrificial structure on a substrate. A seed layer is formed on the sacrificial structure. A bottom electrode is formed on the seed layer. A piezoelectric layer is formed on the bottom electrode. A top electrode is formed on the piezoelectric layer. The sacrificial structure is removed to form a cavity. The seed layer is etched through the cavity.

Abstract: A button mechanism is provided, including a button element, a magnet connected to the button, a hollow tube, a first coil, and a second coil. The first and second coils are disposed on the tube. When the first coil generates a first magnetic field, the magnet is magnetically attracted by the first coil, and the button element is positioned in the first position. When the second coil generates a second magnetic field, the magnet is attracted by the second coil, and the button element is positioned in the second position.

Abstract: A blood pressure device includes a first blood pressure measuring device, a second blood pressure measuring device, and a controller. The first blood pressure measuring device is to be worn on a first position of a wrist so as to obtain a first blood pressure information of the first position. The second blood pressure measuring device is to be worn on a second position of the wrist so as to obtain a second blood pressure information of the second position. The controller is electrically coupled to the first blood pressure measuring device and the second blood pressure measuring device so as to adjust tightness between the expanders and the user's skin, respectively. The controller receives, processes, and calculates a pulse transit time between the first blood pressure information and the second blood pressure information, and the controller obtains at least one blood pressure value based on the pulse transit time.

Abstract: The present invention relates to a non-enzymatic disposable uric acid detecting electrode strip which directly detects the concentration of uric acid in liquid sample under a low operation voltage of below 400 mV and pH value from 7.0 to 10.0. When the electrode strip is applied to detect the concentration of uric acid in human body, it avoids interference signals caused from any other components in blood and will not be interfered by ascorbic acid unless the concentration of ascorbic acid increases to 15 times of its normal concentration in blood. Not only serum but also whole-blood can be taken as a sample for detecting the uric acid concentration thereof. The uric acid detecting electrode strip is modified by a water soluble redox electron mediator. The electrode strip is easy to carry and can be easily made, particularly mass-produced.

Abstract: A process is disclosed for the preparation of D-lactic acid from lactate racemic mixture. It comprises the steps of: (i) hydrolysis of an alkyl lactate racemic mixture in the presence of an esterase as a catalyst to hydrolyze L-alkyl lactate; (ii) separation of unhydrolyzed D-alkyl lactate with an organic solvent, such as n-hexane or a high alcohol; and (iii) chemical hydrolysis of the separated portion obtained from step (ii) with a base to obtain D-lactic acid. The esterase can be selected from the group consisting of pig pancreas lipase of the trade name Sigma L-3126, wheat germ lipase of the trade name Sigma L-3001, Candida cyclindracea lipase of the trade name Sigma L-1754, Rhizopus lipase of the trade name Serva 27930, Mucor javanicus lipase of the trade name Fluca 62304, Aspergillus niger lipase of the trade name Fluca 62301, Rhizopus arrhizus lipase of the trade name Boehringer Mannherin 414590, and Candida cylindracea cholesterol esterase of the trade name Boehringer Mannherin 396800.

Abstract: Zinc salts of Cephalosporin C are dissolved in a solution of halides of univalent metals at a temperature of 0.degree.-25.degree. C. and the pH is adjusted to 1-2 prior to being ion exchanged with a sodium form cation-exchange resin packed in a column and being eluted with a water miscible solvent. The column can be further eluted with a solution of halides of univalent metals.