CN1605899A - Primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator - Google Patents
Primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator Download PDFInfo
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- CN1605899A CN1605899A CN 200410066426 CN200410066426A CN1605899A CN 1605899 A CN1605899 A CN 1605899A CN 200410066426 CN200410066426 CN 200410066426 CN 200410066426 A CN200410066426 A CN 200410066426A CN 1605899 A CN1605899 A CN 1605899A
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Abstract
The invention discloses a primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator, wherein one end of the rotation shaft is provided with an encoder, the other side is provided with a crystal groove for accommodating a crystal fine voltage regulating plate and an a first crystal, the crystal press plate, the briquette water pipe flange are soldered for pressing the first crystal and connecting with the crystal groove, the encoder mounting rack is connected in turn with the encoder, the angle meter, transmission connection board and the transmission connection sleeve. The transmission sleeve is secured to the rotation shaft through an aligning key, the rotation shaft is provided with an angular contact bearing, one end of the bearing seat is connected with a magnetic fluid-tight assembly.
Description
Technical field
What the present invention relates to is a kind of driving rotating shaft system, and particularly a kind of primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator is used for the plant equipment field.
Background technology
At present, the first crystal rotating shaft drive system in the synchrotron radiation double-crystal monochromator mainly comprises rotating shaft, a brilliant carriage, Huber corner instrument, angle probe, vacuum sealing device and cooling system.Their structural design and relative position arrange that the performance to double-crystal monochromator has direct influence.
Find by literature search, described the first crystal rotating shaft drive system of the Hefei synchrotron radiation light source of having succeeded in developing (HLS) in " synchrotron radiation X-ray twin crystal monochromator energy scan " that people such as Wang Feng deliver August calendar year 2001 on " optical precision engineering " the 9th the 4th phase of volume.Point out in the literary composition that in the inboard of vacuum cavity, the carriage of clamping one crystalline substance directly fuses with turntable, the cavity outside is fixed with corner instrument and angle probe, the magnet fluid sealing bearing of developing voluntarily is housed, as the dynamic isolation of vacuum and atmosphere on the cover plate.Connect by shaft coupling between angle probe and the rotating shaft, their axis overlaps mutually.The weak point of this structure is that the shaft coupling between angle probe and the axle head is easy to generate torsional error, makes detector can not accurately reflect the corner of rotating shaft.And, during installation, must guarantee that shaft centerline must pass through a Jingjing face, and a brilliant carriage links to each other with turntable, because the alignment error between turntable and the rotating shaft, the mounting hardness that has increased and the complicacy of adjusting.In addition, the first crystal rotating shaft drive system of Hefei synchrotron radiation light source (HLS) does not design cooling system.
Summary of the invention
The objective of the invention is at deficiency of the prior art, a kind of double-crystal monochromator first crystal driving rotation axis system is provided.Make its mode guarantee the accuracy of rotating shaft system corner, and utilize the magnetic fluid vacuum transmission device to keep the interior condition of high vacuum degree of double-crystal monochromator cavity by high-precision incremental rotary encoder and rotating shaft direct connection.Most water-cooling channel has not only been saved the space directly vertically by rotating shaft, and in cooling first crystal, can also eliminate magnet fluid sealing assembly and rotating shaft to a certain extent because fricative heat.
The present invention realizes according to following technical scheme, the present invention includes: crystal fine tuning pressing plate, crystal pressing plate, the magnet fluid sealing assembly, angular contact bearing, corner instrument, positioning key, the plate that is in transmission connection, scrambler, the scrambler mounting bracket, pipe adapter, sleeve is in transmission connection, bearing seat, rotating shaft, O shape circle, the seam of briquetting water pipe flange, first crystal, micrometer adjusting screw.
Its connected mode is: process the outstanding circular axle head that a center overlaps with the rotating shaft center at an end of rotating shaft, open a screw therein in the heart, use socket head cap screw that scrambler the carries center pit by scrambler to be screwed into screw on the axle head.The scrambler hole just in time cooperates with axle head, and wherein the diameter precision in scrambler hole is φ 15
0 + 0.005Mm, axle head diameter precision is φ 15
-0.005 -0.001Mm, end axial surface axial runout are 0.01mm.Near the outstanding axle head surface need contact with the surface of scrambler, so required surperficial axial runout is 0.0005mm.The scrambler mounting bracket is connected with the flange section of scrambler, and the housing with the corner instrument is connected again.The corner instrument is fixedlyed connected between the plate with being in transmission connection, and the plate that is in transmission connection is connected with the cover that is in transmission connection, be in transmission connection overlap and rotating shaft between fix with positioning key, be connected with rotating shaft by holding screw simultaneously.A pair of angular contact bearing is installed in the rotating shaft back-to-back, is supported by bearing seat.
The other end of rotating shaft is provided with the crystal groove, after the crystal fine tuning pressing plate is packed in the crystal groove, put into first crystal again, crystal pressing plate, the seam of briquetting water pipe flange are pushed down the first brilliant back and are connected with the crystal groove, are connected with seal with O ring respectively between the seam of briquetting water pipe flange and first crystal on side face.Bottom surface at the crystal groove is screwed with the adjustment screw.Also have many microchannels on other first crystal.
That end mill in the rotating shaft that is connected with scrambler goes out two and centrosymmetric circular groove, makes a call to two elongated passages along the axial of rotating shaft respectively from the groove center, and clogs with plug screw.Two passages near the other end of rotating shaft the time, change into vertical with original direction radially, lead to the outside respectively.Lead to two outside holes and join with the seam of briquetting water pipe flange respectively, be connected by seal with O ring respectively between the flange in the seam of briquetting water pipe flange and the rotating shaft, be screwed again.The hole of making a call to two symmetries on the shaft part of scrambler mounting bracket place communicates with two passages, difference tubular stinger joint in these two holes.
The magnet fluid sealing assembly comprises: magnetic fluid, permanent magnet, magnetic pole, O RunddichtringO, gland, housing.Its connected mode is: process two sections multi-stage annular gaps in rotating shaft, wherein be full of magnetic fluid, magnetic fluid mainly is made up of refined oil and diester, has the higher magnetization and viscosity.Magnetic pole is installed in respectively on two sections multistage gaps, and permanent magnet places between the magnetic pole, and the magnetic flux that permanent magnet produces forms the action of a magnetic field in magnetic fluid through magnetic pole, magnetic fluid is held in the gap, form magnetic fluid " O " type ring, thereby the gap is blocked, reach the purpose of sealing.At magnetic pole and permanent magnet overcoat upper shell, O shape circle is installed between housing and the magnetic pole again, gland is installed then, be screwed between housing and the gland to play the effect of static seal.
Bearing seat is welded by metal dish and metallic sheath two parts, is connected with screw between the housing of metal dish one end and corner instrument, and metallic sheath one end is connected by screw with the housing of magnet fluid sealing assembly, and O shape circle is installed.The flange section of metallic sheath is connected by screw with vacuum cavity again, uses seal with O ring to connect simultaneously.
When the present invention moves, the corner instrument carries stepper motor, to the stepper motor energising, drives the turbine and worm transmission in the corner instrument, make the corner instrument drive rotating shaft and rotate, drive first crystal simultaneously along with rotating shaft is rotated together around axis by the plate that is in transmission connection, be in transmission connection sleeve and positioning key.Then form relative rotation between fixed magnet fluid sealing assembly and the rotating shaft, make annular gap, permanent magnet and magnetic pole on magnetic fluid and the rotation axis form the dynamic seal (packing) loop, guarantee the condition of high vacuum degree in left side of the rotating shaft at the first crystal place.Rotating shaft is passed to scrambler by the connection of screw with rotation, and scrambler is directly measured the promptly actual Bragg corner of corner of rotating shaft, and its reading accuracy is one rad.From the ionized water of a pipe adapter injection uniform temperature and speed, water flows into along a passage, and seam flows to the microchannel of first crystal through briquetting water pipe flange, forms microchannel type cooling structure.Ionized water flows out by another pipe adapter from another briquetting water pipe flange seam and another passage again, thereby finishes the function of the first crystal water-cooled.
The present invention has substantive distinguishing features and marked improvement.Adopted this technology of magnet fluid sealing, for adapting to vacuum environment, magnetic fluid seal circle standard design pressure is greater than two atmospheric pressure, so be perfectly safe.And magnetic fluid surrounds whole rotating shaft, becomes the O-ring seal of elements such as secluding air, aqueous vapor, smog, and can guarantee does not almost have leakage, do not have the machinery wearing and tearing, long service life.Take the mode of rotating shaft and scrambler direct connection, can eliminate the error that the torsional deflection because of shaft coupling produces, improved the precision of Bragg corner, help the validity of double-crystal monochromator work.The corner instrument that is adopted has characteristics such as high precision, high capacity and compact conformation, and its outside surface is through polishing, anodizing, chromium plating, and small step journey angle is 0.18 ", repeatable accuracy is less than 2 ", maximum carrying lotus reaches 3600N.Its stepper motor that carries adopts three-phase hybrid stepping motor, drives secondary and 1: 20 the gear-shift mechanism of 1: 360 refining in corner instrument turbine and worm with 1000 step/commentaries on classics, generation smoothly, without male offspring towards and the high angular displacement of repeatable accuracy.And, between being in transmission connection sleeve and rotating shaft, the link of corner instrument not only is connected by positioning key, and also use holding screw to fix, can not produce hysteresis phenomenon when making the corner instrument drive the rotating shaft rotation because of the gap between positioning key and the keyway.Among the present invention, the crystal groove of placing first crystal is directly to be processed by rotating shaft, avoided the error of installation process, and the crystal fine tuning pressing plate has been housed under first crystal and adjusts screw, the position that can accurately adjust the first crystal crystal face makes it to pass through shaft centerline.The passage of water-cooling system of the present invention is through rotating shaft inside, and instrument can suitably not reduce the total system size, goes back countershaft and goes up the parts of installing, and plays certain cooling effect as bearing, magnet fluid sealing parts etc.
Description of drawings
Fig. 1 structure forward of the present invention diagrammatic cross-section
Fig. 2 first crystal and water-cooling structure plan structure synoptic diagram
Fig. 3 first crystal and water-cooling structure side-looking structural representation
Fig. 4 magnet fluid sealing modular construction synoptic diagram
Embodiment
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention includes: 1,2 crystal pressing plate 2 of crystal fine tuning pressing plate, 3,2 angular contact bearings 4 of magnet fluid sealing assembly, O shape circle 16,20, the corner instrument 6 of band stepper motor, positioning key 7, plate 8 is in transmission connection, scrambler mounting bracket 9, scrambler 10, pipe adapter 12, the sleeve 13 that is in transmission connection, bearing seat 14, rotating shaft 15,2 briquetting water pipe flanges seam, 17, the first crystal 18, micrometer adjusting screw 19.
Its connected mode is: the end in rotating shaft 15 processes the outstanding circular axle head that a center overlaps with rotating shaft 15 centers, open a screw therein in the heart, use socket head cap screw that scrambler 10 the carries center pit by scrambler 10 to be screwed into screw on the axle head.The scrambler hole just in time cooperates with axle head, and wherein the diameter precision in scrambler hole is φ 15
0 + 0.005Mm, axle head diameter precision is φ 15
-0.005 -0.001Mm, end axial surface axial runout are 0.01mm.Near the outstanding axle head surface need contact with the surface of scrambler 10, so required surperficial axial runout is 0.0005mm.Scrambler mounting bracket 9 is connected by the flange section of screw with scrambler 10, and the housing with corner instrument 6 is connected with screw again.Corner instrument 6 is connected by screw retention between the plate 8 with being in transmission connection, and the plate 8 that is in transmission connection is connected with the cover 13 that is in transmission connection with screw again, and usefulness positioning key 7 is fixed between be in transmission connection cover 13 and the rotating shaft 15, is connected with rotating shaft 15 by holding screw simultaneously.A pair of angular contact bearing 4 is installed in the rotating shaft 15 back-to-back, is supported by bearing seat 14, bearing seat 14 1 ends are connected with magnet fluid sealing assembly 3.
The other end of rotating shaft 15 is provided with a crystal groove, pack into crystal fine tuning pressing plate 1 in the crystal groove after, put into again and be connected with screw with the crystal groove after 18,2 crystal pressing plates 2 of first crystal are pushed down the crystal face edge of first crystal 18.2 briquetting water pipe flanges seam 17 is connected with screw with the crystal groove after pushing down the side of first crystal 18, is tightly connected with 2 O shapes circles 16 respectively between briquetting water pipe flange seam 17 and first crystal, 18 sides.Bottom surface at the crystal groove is screwed with 4 adjustment screws 19.Also have many microchannels on other first crystal 18.
That end mill in the rotating shaft 15 that is connected with scrambler 10 goes out two and centrosymmetric circular groove, makes a call to two elongated passages along the axial of rotating shaft 15 respectively from the groove center, and clogs with 2 plug screws 11.Two passages near the other end of rotating shaft 15 time, change into vertical with original direction radially, lead to the outside respectively.Lead to two outside holes and join with 2 briquetting water pipe flanges seam 17 respectively, be tightly connected by O shape circle 20 respectively between flange in the briquetting water pipe flange seam 17 and the rotating shaft 15, be screwed again.The hole of making a call to two symmetries on scrambler mounting bracket 9 place shaft parts communicates with two passages, inserts 2 pipe adapters 12 respectively in these two holes.
Magnet fluid sealing assembly 3 comprises: magnetic fluid 26,23,2 magnetic poles 24 of permanent magnet, O RunddichtringO 25, gland 27, housing 21.Its connected mode is: process two sections multi-stage annular gaps in rotating shaft 15, wherein be full of magnetic fluid 26, magnetic fluid 26 mainly is made up of refined oil and diester, has the higher magnetization and viscosity.2 magnetic poles 24 are installed in respectively on two sections multistage gaps, permanent magnet 23 places between the magnetic pole 24, the magnetic flux that permanent magnet 23 produces forms the action of a magnetic field in magnetic fluid 26 through magnetic pole 24, magnetic fluid 26 is held in the gap, form magnetic fluid " O " type ring, thereby the gap is blocked, reached the purpose of sealing.At magnetic pole 24 and permanent magnet 26 overcoat upper shells 21, O shape circle 25 is installed between housing 21 and the magnetic pole 24 again, gland 27 is installed then, be screwed between housing 21 and the gland 27 to play the effect of static seal.
When the present invention moves, the stepper motor energising of carrying for corner instrument 6, drive the turbine and worm transmission in the corner instrument 6, make corner instrument 6 drive rotating shafts 15 and rotate, drive first crystal 18 simultaneously along with rotating shaft 15 is rotated together around axis by the plate 8 that is in transmission connection, be in transmission connection sleeve 13 and positioning key 7.Then form relative rotation between fixed magnet fluid sealing assembly 3 and the rotating shaft 15, make annular gap on magnetic fluid 26 and the rotation axis 15, permanent magnet 25 and magnetic pole 27 form the dynamic seal (packing) loops, guarantee the condition of high vacuum degree in left side of the rotating shaft 15 at first crystal, 18 places.Rotating shaft 15 is passed to scrambler 10 by the connection of screw with rotation, and scrambler 10 is directly measured the promptly actual Bragg corner of corner of rotating shaft 15, and its reading accuracy is one rad.From the ionized water of a pipe adapter 12 injection uniform temperatures and speed, water flows into along a passage, and process briquetting water pipe flange seam 17 flows to the microchannel of first crystal 18, forms microchannel type cooling structure.Ionized water flows out by another pipe adapter 12 from another briquetting water pipe flange seam 17 and another passage again, thereby finishes the function of a brilliant water-cooled.
Claims (6)
1, a kind of primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator, comprise: crystal fine tuning pressing plate (1), crystal pressing plate (2), magnet fluid sealing assembly (3), angular contact bearing (4), corner instrument (6), positioning key (7), plate (8) is in transmission connection, scrambler mounting bracket (9), scrambler (10), pipe adapter (12), sleeve (13) is in transmission connection, bearing seat (14), rotating shaft (15), O shape circle (16,20), briquetting water pipe flange seam (17), first crystal (18) and micrometer adjusting screw (19), it is characterized in that, rotating shaft (15) one ends are provided with circular axle head, scrambler (10) is arranged on the circular axle head of rotating shaft (15), the other end of rotating shaft (15) is provided with the crystal groove, after crystal fine tuning pressing plate (1) is packed in the crystal groove, put into first crystal (18) again, crystal pressing plate (2), briquetting water pipe flange seam (17) is pushed down first crystal (18) back and is connected with the crystal groove, be tightly connected with O shape circle (16) between briquetting water pipe flange seam (17) and first crystal (18) side, the bottom surface of crystal groove is screwed with adjusts screw (19), scrambler mounting bracket (9) is connected with scrambler (10), housing with corner instrument (6) is connected again, corner instrument (6) is fixedlyed connected with the plate that is in transmission connection (8), the plate (8) that is in transmission connection is connected with the cover (13) that is in transmission connection, it is fixing with positioning key (7) between cover (13) and the rotating shaft (15) to be in transmission connection, be provided with a pair of angular contact bearing (4) in the rotating shaft (15) back-to-back, support by bearing seat (14), bearing seat (14) one ends are connected with magnet fluid sealing assembly (3), one end of the rotating shaft (15) that is connected with scrambler (10) is provided with two passages, two passages join with briquetting water pipe flange seam (17) respectively, be tightly connected by O shape circle (20) between flange in the briquetting water pipe flange seam (17) and the rotating shaft (15), establish the hole of two symmetries on the shaft part of scrambler mounting bracket (9) place, difference tubular stinger joint (12) in these two holes.
2, primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator according to claim 1, it is characterized in that, the circular axle head of rotating shaft (15), it is the outstanding circular axle head that the center overlaps with rotating shaft (15) center, a screw is arranged on circular axle head center, scrambler (10) is screwed into screw on the circular axle head by the socket head cap screw that carries through the center pit of scrambler (10), and the scrambler hole just in time cooperates with circular axle head, and wherein the diameter precision in scrambler hole is φ 15
0 + 0.005Mm, circular axle head diameter precision is φ 15
-0.005 -0.001Mm, circular shaft end surfaces axial runout is 0.01mm, and near the surface the outstanding axle head contacts with the surface of scrambler (10), and surperficial axial runout is 0.0005mm.
3, according to claim 1 or 2 described primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator, it is characterized in that, one end of the rotating shaft (15) that is connected with scrambler (10) is provided with two and centrosymmetric circular groove, axially make a call to two elongated passages along rotating shaft (15) respectively from the groove center, and clog with plug screw (11), two passages are near the other end of rotating shaft (15) time, change into vertical with original direction radially, lead to the outside respectively, lead to two outside passages and join with briquetting water pipe flange seam (17) respectively, two holes on the shaft part of scrambler mounting bracket (9) place communicate with two passages.
4, primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator according to claim 1, it is characterized in that, crystal pressing plate (2) is connected with screw with the crystal groove after pushing down the crystal face edge of first crystal (18), briquetting water pipe flange seam (17) is connected with screw with the crystal groove after pushing down the side of first crystal (18), and first crystal also is provided with many microchannels on (18).
5, primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator according to claim 1, it is characterized in that, magnet fluid sealing assembly (3) comprises magnetic fluid (26), permanent magnet (23), magnetic pole (24), O shape circle (25), gland (27), housing (21), its annexation is: two sections multi-stage annular gaps are set in rotating shaft (15), wherein be full of magnetic fluid (26), magnetic pole (24) is arranged on two sections multistage gaps, and permanent magnet (23) places between the magnetic pole (24), the magnetic flux that permanent magnet (23) produces forms the action of a magnetic field in magnetic fluid (26) through magnetic pole (24), magnetic fluid (26) is held in the gap, form magnetic fluid " O " type ring, thereby the gap is blocked, again at magnetic pole (24) and permanent magnet (26) overcoat upper shell (21), O shape circle (25) is set between housing (21) and the magnetic pole (24), gland (27) is set then, be screwed between housing (21) and the gland (27).
6, according to claim 1 or 5 described primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator, it is characterized in that, bearing seat (14) is welded by metal dish and metallic sheath two parts, metal dish one end is connected with the housing of corner instrument (6), metallic sheath one end is connected with the housing (21) of magnet fluid sealing assembly (3), and O shape circle (22) is set, the flange section of metallic sheath is connected with vacuum cavity again, simultaneously by O shape circle (5) sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100664263A CN1303453C (en) | 2004-09-16 | 2004-09-16 | Primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100664263A CN1303453C (en) | 2004-09-16 | 2004-09-16 | Primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1605899A true CN1605899A (en) | 2005-04-13 |
| CN1303453C CN1303453C (en) | 2007-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100664263A Expired - Fee Related CN1303453C (en) | 2004-09-16 | 2004-09-16 | Primary crystal driving rotation axis system for synchrotron radiation bicrystal monochromator |
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| CN (1) | CN1303453C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775649A (en) * | 2014-01-15 | 2014-05-07 | 中国科学院半导体研究所 | Sealing transmission device |
| CN106444850A (en) * | 2016-09-26 | 2017-02-22 | 西安应用光学研究所 | Position turning table applicable to vehicle-mounted reconnaissance system and mounting method of position turning table |
| CN112748136A (en) * | 2020-12-07 | 2021-05-04 | 中国科学院高能物理研究所 | Fast scanning X-ray absorption fine structure spectroscopy monochromator |
| CN113551651A (en) * | 2016-01-05 | 2021-10-26 | 上海筑邦测控科技有限公司 | Inclination angle sensor based on drop hammer position video identification technology |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157702A (en) * | 1990-12-14 | 1992-10-20 | Wisconsin Alumni Research Foundation | Mechanically actuated double crystal monochromater |
| US5268954A (en) * | 1992-10-14 | 1993-12-07 | Wisconsin Alumni Research Foundation | Mounting apparatus for double crystal monochromators and the like |
| JP2001188097A (en) * | 1999-12-28 | 2001-07-10 | Rigaku Corp | X-ray beam regulator |
| CN1403850A (en) * | 2002-10-24 | 2003-03-19 | 上海交通大学 | Two-dimensional precise angle trimmer for the second crystal of double-crystal monochromator |
-
2004
- 2004-09-16 CN CNB2004100664263A patent/CN1303453C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775649A (en) * | 2014-01-15 | 2014-05-07 | 中国科学院半导体研究所 | Sealing transmission device |
| CN103775649B (en) * | 2014-01-15 | 2016-03-02 | 中国科学院半导体研究所 | Sealed gearing device |
| CN113551651A (en) * | 2016-01-05 | 2021-10-26 | 上海筑邦测控科技有限公司 | Inclination angle sensor based on drop hammer position video identification technology |
| CN106444850A (en) * | 2016-09-26 | 2017-02-22 | 西安应用光学研究所 | Position turning table applicable to vehicle-mounted reconnaissance system and mounting method of position turning table |
| CN106444850B (en) * | 2016-09-26 | 2019-03-29 | 西安应用光学研究所 | A kind of azimuth rotating platform and its installation method suitable for vehicle-mounted reconnaissance system |
| CN112748136A (en) * | 2020-12-07 | 2021-05-04 | 中国科学院高能物理研究所 | Fast scanning X-ray absorption fine structure spectroscopy monochromator |
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|---|---|
| CN1303453C (en) | 2007-03-07 |
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