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公开(公告)号：US5175508A
公开(公告)日：1992-12-29
申请号：US802686
申请日：1991-12-05
摘要： A voltage-controlled amplifier employs an operational amplifier with negative feedback for setting the gain. A voltage variable resistance such as a junction-field-effect transistor (JFET) is employed as part of a variable voltage divider for controlling the amplifier gain. Resistors in series and in parallel with the JFET determine minimum and maximum resistances corresponding to upper and lower limits for the amplifier gain. Thus, multiple channels of an amplifier can be provided with closely matched characteristics even using separate JFETs in each separate channel which have unmatched characteristics.
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公开(公告)号：US5138280A
公开(公告)日：1992-08-11
申请号：US802590
申请日：1991-12-05
CPC分类号： H03G1/007 , H03G3/3015
摘要： A multichannel amplifier employs field-effect transistors to vary the gain of operational amplifiers in each respective channel. Gain matching of the respective channels is obtained by providing each channel with a respective DC bias voltage which compensates for differences in pinch-off voltage of the field-effect transistors. The invention permits the use of inexpensive, unmatched JFETs in the amplifier. Close gain tracking achieves very accurate stereo imaging in an audio system.
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公开(公告)号：US20110210075A1
公开(公告)日：2011-09-01
申请号：US13061714
申请日：2009-09-02
CPC分类号： C02F1/463 , C02F1/305 , C02F1/32 , C02F1/36 , C02F1/4602 , C02F1/4608 , C02F1/68 , C02F5/02 , C02F2101/20 , C02F2101/32 , C02F2201/003 , C02F2303/04
摘要： The present invention provides electrocoagulation devices and methods for using the same to treat water to remove at least a portion of suspended, dissolved solids, or a combination thereof.
摘要翻译： 本发明提供电凝装置及其使用方法，用于处理水以去除至少一部分悬浮的，溶解的固体或其组合。
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公开(公告)号：US20100320155A1
公开(公告)日：2010-12-23
申请号：US12866893
申请日：2009-02-11
CPC分类号： C02F1/5236 , C02F1/302 , C02F1/305 , C02F1/32 , C02F1/36 , C02F1/4608 , C02F1/66 , C02F5/00 , C02F2209/06
摘要： The invention provides methods for treating aqueous solutions to remove dissolved metallic ions.
摘要翻译： 本发明提供了处理水溶液以除去溶解的金属离子的方法。
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公开(公告)号：US20110233136A1
公开(公告)日：2011-09-29
申请号：US13061715
申请日：2009-09-02
IPC分类号： C02F9/00
CPC分类号： C02F9/00 , C02F1/20 , C02F1/281 , C02F1/465 , C02F1/4672 , C02F2103/365 , C02F2303/02
摘要： The present invention provides a process for treating water that comprises chloride ions, other ions (e.g., ferrous ions, sulfide ions, or sulfite ions) and microorganisms.
摘要翻译： 本发明提供一种处理含有氯离子，其他离子（如亚铁离子，硫化物离子或亚硫酸根离子）和微生物的水的方法。
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公开(公告)号：US20110064634A1
公开(公告)日：2011-03-17
申请号：US12866892
申请日：2009-02-11
IPC分类号： B01D53/62
CPC分类号： B01D53/62 , B01D53/323 , B01D53/77 , B01D2251/304 , B01D2251/40 , B01D2251/606 , B01D2257/504 , B01D2259/804 , B01D2259/806 , B01D2259/812 , B01D2259/816 , B01D2259/818 , Y02A50/2342 , Y02C10/04
摘要： The present invention provides methods and apparatuses for removing carbon dioxide from gaseous emissions. In particular, the present invention provides methods and apparatuses for removing carbon dioxide from gaseous emissions as a metallic carbonate precipitate.
摘要翻译： 本发明提供从气体排放物中除去二氧化碳的方法和装置。 特别地，本发明提供了作为金属碳酸盐沉淀物从气体排放物中除去二氧化碳的方法和装置。
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