中国男人：达则分手美国男人：穷则离异
[阅读全文]
智慧人生
人生随缘 看不惯别人是自寻烦恼 .可以不拥有任何东西，除了对生活的激情。好好生活,你的生命是一次性的。
博文
(2004-12-30 20:16:50)
(2004-12-30 20:14:54)
美国人总是在恋爱中寻找快乐。他们期望娱乐、性欲的满足和幸福。当一个男人和一个女人相爱，他们就一起娱乐，一起过性生活，然后，当双方感到能够给彼此带来幸福时，他们就结婚了，并期待永久的幸福。当娱乐和性欲消退的时候，当幸福不再的时候，当生活尽显单调乏味的时候，婚姻就出现了危机。
中国人，至少是我这一代或老一代人，对爱情具有完[阅读全文]
中国人，至少是我这一代或老一代人，对爱情具有完[阅读全文]
(2004-12-30 06:29:10)
Whatisnoticeableabouttheacousticfieldbeforeandafterprocessing?Thecenterofthebeamthatcontainstheharmonicfrequencieshasbeenfilteredoutusingconventionalprocessingtechniques.Theillustrationtotheleftoftheacousticfieldshowsthereceivefilterprocessingthesamefrequenciesaswerecontainedinthetransmittedsignal.Whatisnoticeableabouttheacousticfieldbeforeandafterprocessing?Thecenterofthebeamthatcontainstheh...[阅读全文]
(2004-12-30 06:24:55)
Thisillustrationshowshowharmonicprocessingfiltersoutthefundamentalfrequenciesandusesonlytheharmonicfrequencies.Noticethatthereceivefilterhasshifteduptotwicethetransmittedsignal.Thisindicatesthatthesystemisnowusingonlytheharmonicfrequenciesandisfilteringoutordiscardingthefundamentalsignal.[阅读全文]
(2004-12-30 06:18:38)
Thismoduleexplainsthedifferencebetweenconventionalandharmonicimagingfields,processingtechniquesandtheimpactharmonicprocessinghasonimageartifacts.
Thisillustrationisanexampleofatypicalacousticfield.Thehighestenergyisconcentratedinthecenterofthebeam,andasaresult,theharmonicenergyislocatedinthecenterofthebeam.Thewavehastotravelsomedistancetobecomedistortedenoughtogenerateharmonics.Itisforthisreas...[阅读全文]
(2004-12-30 06:09:41)
Harmonicfrequenciesareequaltotwicethetransmittedfrequencies.Forexample,a3mHztransducertransmitsat3MHzandwillreceiveat6MHzinTissueHarmonicImaging.Ifascanheadistransmittingarangeoffrequenciesfrom5.0-7.5mHz,thegeneratedfrequenciesare10-15MHz.
Theillustrationabovedemonstratesthedifferencebetweenthetransmittedfrequenciesandtheharmonicfrequencies.ThebandwidthrequiredforTissueHarmonicImagingiswiderth...[阅读全文]
(2004-12-30 06:07:20)
Asanoceanwavenearstheshore,thebottompartofthewavebeginstoslowdownduetothedragofthebottomsurfaceitistravelingover,butthetopofthewavecontinuestravelingatthesamespeed.Eventuallythetopofthewavewillbetravelingfasterthanthebottomofthewave.Thewavethenbeginstochangeshapeandthetopofthewavecrashesontotheshore.http://theonlinelearningcenter.com/Assets/module_medias/Module37_wave1.mov[阅读全文]
(2004-12-30 06:02:04)
Inthismoduleyouwilllearnwhatharmonicimagingis,howharmonicfrequenciesaregeneratedandhowthesefrequenciesdifferfromconventionalultrasound.WhatisTissueHarmonicImaging?THIisthereceptionandprocessingofharmonicfrequenciesgeneratedbytissue.Wheredoharmonicfrequenciescomefrom?Asoundwavetravelingthroughthebodyisapressurewave.Tissueissomewhatcompressiblewhenpressurewavespassthrough.Thespeedofsoundisalsoaffect...[阅读全文]
(2004-12-30 05:50:00)
InTissueHarmonicImagingthefrequenciesgeneratedbytissuearereceivedandprocessedbythesystemtoimprovecontrastresolution,decreasenoiseandincreaseborderdelineation.
Thiscoursedescribeshowharmonicfrequenciesaregeneratedandprocessedtoimproveimagequality.
UponcompletionofthiscoursetheparticipantwillunderstandthefundamentalprinciplesofTissueHarmonicImaging.Theparticipantwillbeabletoexplainhowthispro...[阅读全文]
Thiscoursedescribeshowharmonicfrequenciesaregeneratedandprocessedtoimproveimagequality.
UponcompletionofthiscoursetheparticipantwillunderstandthefundamentalprinciplesofTissueHarmonicImaging.Theparticipantwillbeabletoexplainhowthispro...[阅读全文]
(2004-12-30 05:33:49)
长久以来，各国专家都在致力于研究能使人变得更聪明的方法。最近，德国科学家研究发现，能使人变聪明的最简单的方法其实就是有规律的性爱。该研究报告指出，有规律的性爱不仅能够使人的身体亢奋，还能够刺激人的大脑，让大脑变得异常活跃，从而使人变得更加聪明。而这个作用在女性身上将表现得更为明显。该研究报告发表在英国著名的“阿娜诺娃”网站上。倍可[阅读全文]
