Solution-combusting preparation of mono-dispersed Mn3O4 nanoparticles for electrochemical applications

Manganese oxide (Mn₃O₄) nanoparticles with average diameter of 15 nm were prepared using alcohol solution of manganese chloride as starting material via a facile solution-combusting method. The flame core zone was chosen to prepare mono-dispersed and high crystalline products, which were employed to modify glassy carbon electrode and detect dopamine via cyclic voltammetry. The results exhibited excellent electrochemical sensitivity. A linear relationship between the concentration of dopamine and its oxidation peak current was obtained by differential pulse voltammetry, which will find wide application in the biological detection.     

Magnetic Screening of the Potential Targeted Protein of Salvianolic Acid B Using T7 Phage Display Library

Salvianolic acid B is one of the effective components from the Chinese traditional drug Salvia miltiorrhiza (Danshen), which is widely used as a usual clinic drug for atherosclerosis-related disorder patients in China. But the targeting protein of salvianolic acid B is still not known. The possible targeting proteins of salvianolic acid B were explored by high throughput screening in this paper. Attached to the magnetic nanoparticles, salvianolic acid B was used for screening the high-affinity protein from the displaying cDNA peptide library phage. After biopanning, the selected protein or peptide sequences were used to explore the whole proteins containing the selected sequences in the National Center for Biotechnology Information website using blast. One of the selected phages was carried out by affinity analysis with salvianolic acid B using capillary electrophoresis (CE). The CE results indicated that the protein or peptide on the surface of the selected phages could bind the drug salvianolic acid B. The results are helpful to preliminarily explain the pharmacology of salvianolic acid B.     

Clocked power control circuit for inductively powered devices

Inductively powered devices are finding increasing use in many applications, such as biomedical implants and radio frequency identification (RFID) tags. In these systems, because of transmitter and receiver movements, the receiver coil may get close to the transmitter coil, which results in more than needed power delivered to the receiver load. This increases heat dissipated in the receiver circuit. In order to avoid overheating the receiver in such a high magnetic field (short coil separation distance) condition, the received power should be monitored and controlled. This paper introduces a clocked power control circuit integrated in the implant receiver, which is an independent, automatic power adjustment solution to limit heat dissipation with response to the coil separation distance. In this circuit, the rectified voltage across the load is monitored, and converted to a digital representation to selectively detune the receiver inductor-capacitor (LC) tank. To demonstrate this concept, a design example applied to inductively powered implants is given. Measurements on the prototype with a varied coil separation distance validate the desired power control functionality. Less power dissipation is achieved for the receiver compared to no power control condition.     

浅谈海面覆盖

上海有172km的海岸线。由于GSM无线设备TA值的限制，因此延海设置的基站理论上仅能覆盖35km左右的海岸范用，而事实上，同时因为兀线设备发射功率、天线挂高等相关因素的影响，无线覆盖距离只有十几公里。如果要突破无线信号35km的覆盖极限，就必须对无线信号在海面上的传播方式进行研究，并采用新兴的无线技术——“扩展小区”技术。     

Flattened chromatic dispersion in square photonic crystal fibers with low confinement losses

This research presents a simple index-guiding square photonic crystal fibers (SPCFs) that has a silica core surrounded by air hole with two different diameters. It is demonstrated that the designed two-different-size hole-arrayed index-guiding SPCFs has a ultra-flattened chromatic dispersion of 0 ± 0.9 ps/(nm·km) in a wavelength range of 1.34 to 1.61 μm and low confinement loss of less than 10⁻⁷ dB/m in a wavelength range of 1.2 to 1.7 μm. It has also been shown that the proposed SPCFs show reasonable dispersion tolerance.     

Characterization of microstructures induced in the workpiece of aluminum alloy by excimer laser micromachining

Excimer laser emitting at 248 nm is applied to produce microstructures on the surface of aluminum alloy. The surface morphology shows that hotspots and thermal fluidic structures both come to light. Two possible mechanisms of hotspots formation are proposed: near-field diffraction and interference, and extremely fast rapid thermal annealing. And for the formation of thermal fluidic pattern structure, a thin film model is applied.