HKUST Institutional Repository
(5.015 recursos)
Repository of Hong Kong University of Science and Technology. Managed by the HKUST Library.
Mostrando recursos 1 - 6 de 6
1.
Rapid vapor generator - Liao, Qiang; Zhao, Tian-Shou; Cheng, Ping
The invention relates to an electrically-energized device for the rapid generation of steam or other vapors. The high-speed steam generator includes a wicked evaporator, a liquid reservoir, a liquid supply pipe, and a vapor transport tube. The evaporator consists of a low-thermal-conductivity porous wick, heated from a downward-facing grooved heating block that is in intimate contact with the upper surface of the wick structure. The grooved heating block is made of a copper block in which electric cartridge heaters are installed. As a heat load is applied on the heating block, an extremely steep temperature gradient is established immediately at...
2.
Positioning apparatus for hard disk servowriter - Cai, Li-Long; Zhou, Weidong
A servowriter positioning apparatus for hard disk drives comprises and optical read head 2 for directing three focussed light beams on grating sections formed at the end of a grating memer 1 connected to the servo write head(s) 3 in order to indicate the position and movement of the head(s) 3. The optical read head 2 may be based on CD or DVD technology. The servo write head(s) 3 are mounted on an actuator arm 5 to which the grating member 1 is fixed for rotation therewith and which are both driven in rotation by a rotary actuator. The grating...
3.
Laser interferometer system for straightness measurements - Cai, Li-Long; Zhang, Jihua
A laser interferometer system in particular for measuring the straightness of an object is described. This interferometer employs triangular prisms to refract the laser beams by certain angles with respect to the principal axis of the incident beam. Two configurations are described. One is for high accuracy in short range measurements, the other can handle long range measurements with high resolution that is not related to the range. For the latter the interferometer comprises a laser source, a beam splitter, a plane reflector, two first triangular prisms, a second prism, a right angle prism reflector and a detector system. The...
4.
Formic acid-graphite intercalation compound - Kang, Feiyu; Leng, Yang; Zhang, Tong-Yi
A graphite intercalation compound is disclosed in which formic acid (HCOOH) is the intercalate. The GIC may be formed by an electrochemical process using formic acid solution as both the electrolyte and as the intercalate source.The resulting formic acid GIC may be expanded by rapid heating to produce an expanded graphite product that in turn may be mechanically processed into flexible graphite.
5.
Rotary motor driven by a piezoelectric composite laminate - Lee, Ricky Shi-Wei; Li, Hing Leung
There is described a rotary motor in which a rotor disc is driven by a plate-like driving member comprising a laminate of piezoelectric material sandwiched between outer layers of anisotropic material. When a voltage is applied to the rotor disc the driving member expands into driving contact with the rotor disc and?at the same time?owing to the anisotropy of the outer layers, twists with a torsional movement and this torsional movement imparts a rotary movement to the rotor disc.
6.
Auto focus laser encoder having three light beams and a reflective grating - Cai, Li-Long; Zhang, Jihua
An auto-focus laser incremental encoder for measuring linear or rotary motion or position of an object is described. An optical read head focuses three laser beams on the surface of a scaling grating. The grating is a reflection type grating where the height difference between adjacent pixels is one quarter of the wavelength of the laser light whereby the pitch of the grating can be detected by interferometric reflection. There are two sections of grating displaced with respect to each other so that a direction of movement can be readily determined. The third beam acts to provide an autofocus and...
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