文献查找，我找到有个超声类比较全的站点。超声城市
我邮箱，也我一份，我也非常需要。
我都感觉已经不能在回答你的问题了，再回答就会被屏蔽了，第一篇文献已给你上传，希望对你的研究有所帮助，第二篇如还需要，请追问。 Effect of ultrasonic, thermal and ozone pre-treatments on waste activated sludge solubilisation and anaerobic biodegradability
您好，建议您去相关的专业学术网站或者是论坛上进行相关咨询。
《超声》百度网盘高清资源免费在线观看:链接: 提取码: smbw 《超声》导演: Rob Schroeder编剧: Conor Stechschulte主演: 文森特·卡塞瑟、切尔西·洛佩兹、布瑞达·伍尔、滕德·艾德比佩、蕾妮·库利、鲍勃·斯蒂芬森、达娜·林恩·拜伦、Jim Boeven、Chris Dougherty、波特·琳·杨、Tony Evangelista、达维达·威廉姆斯、马克·伯恩汉姆、Cheryl Dent、Gabe Fonseca类型: 剧情、科幻、悬疑制片国家/地区: 美国语言: 英语上映日期: 2021-06-15(翠贝卡电影节)、2022-03-11(美国)片长: 103分钟Driving home late at night during a heavy rainstorm, Glen experiences car Near where his car gets stuck, he spots a house, knocks on the door and is greeted by an oddly friendly middle-aged man, Arthur, and his younger wife, C The strange couple pours him a drink, and then more drinks, followed by an unexpected offer that Glen can’t Elsewhere, a young woman, Katie, is feeling emotionally weighed down by a secret romantic arrangement that feels like a textbook case of And at the same time, in a nondescript research facility, medical professional Julie begins questioning her role in a bizarre experiment, fearing that she’s doing more harm than
医学学术期刊的种类有数千种之多，主要包括三个等级，中文核心期刊，科技核心期刊，和普通期刊，很多省份会划分自己的一类，二类期刊标准，核心期刊大概就有1000多种，其中中文核心200多个，科技核心900多个，学术期刊又根据医学的分类细分为很多类别，比如护理的有中华现代护理杂志，泌尿外科有中华泌尿外科杂志。。。。。其它专业亦是如此，发表一篇跟专业相关的医学论文，可以适当提高职称晋升几率，具体的也可以跟专业机构咨询，希望能为您提供到帮助
左心声学造影现状 中国超声医学杂志 1993年9卷5期, 347~349 赵博文，王新房心肌声学造影的应用 中国医学影像技术 1994年10卷3期198 ~200 赵博文，王新房超声对比剂 国外医学临床放射学分册 1995年18卷4期224~225 赵博文，王新房声振微气泡右心声学造影20例报告 中国超声医学杂志1995年11 卷2期 95~99 赵博文，王新房经食道超声心动图诊断房间隔瘤2例 中国医学影像技术 1995年11卷5期 319~320 赵博文 高敏 范妙英 寿金朵 夏萍经食道超声心动图临床应用49例 浙江医学1995年17卷6期 321~325 赵博文 冼棠超 高敏，范妙英 寿金朵经食道超声心动图在心脏病手术中的应用 中国超声医学杂志 1995年11卷增刊1号23 赵博文 高敏，范妙英 寿金朵经食道超声心动图诊断房间隔瘤 中国超声医学杂志 1995年11卷 增刊1号 104 赵博文 高敏，范妙英 寿金朵左室条束改变155例分析 浙江医学 1996年第18卷3期 149~150 何红 冼棠超 赵博文彩色多谱勒血流显像诊断永存动脉干3例 浙江医学 1996年第 18卷4期 252~253 沈同芳 赵博文 范妙英 寿金朵前上纵隔纤维粘液肉瘤心腔内转移1例 中国超声医学杂志 1996年12卷5期 Page 68 赵博文 范妙英 寿金朵 冼棠超术中经食管超声心动图对二尖瓣位SJude碟瓣的评估 中国超声 医学杂志1997年13卷3期31~33 赵博文 范妙英 寿金朵经食管超声心动图诊断Ebstein畸形 中国医学影像技术 1997年 13卷2期 139~140 赵博文 冼棠超 范妙英 寿金朵术中经食管超声心动图在主动脉深插管监测中的应用 浙江医学 1998年第20卷3期 163 李洪根 赵博文 范妙英 寿金朵 吕江红Intraoperative transesophageal echocardiographic assessmentof SJude Medical (SJM) mitral Journal of Cardiology 1998 Vol Supplement II, 1998 Page 149 Zhao Bo-wen; Fan Miao-yin, Shou Jin-duo, Fan Xiao-min, Mizushige K, Matsuo HTransesophageal contrast echocardiography improving diagnosis of interatrial shunting in patients with atrial septal aneurysm Journal of Cardiology 1998 Vol 32 Supplement II, 1998 Page 150 Zhao Bo-wen; Fan Miao-yin, Shou Jin-duo, Fan Xiao-min, Mizushige K, Matsuo HAssessment of myocardial viability in patients with chronic coronary artery disease: comparison of myocardial contrast echaocardiography(MCE) and low dose dobutamine stress echocardiography Journal of Cardiology 1998 Vol Supplement II, 1998, 129 Zhao Bo- Mizushige K Watanabe K Takagi Y Ueda T Iwado Y Kondo I Matsuo H心脏手术中经食管超声心动图监测的应用 中国胸心血管外科临床 杂志 1999年第6卷1期, 33~34, 何启才 赵博文 李泽坚 王永清 郦志军 叶伟文Incidence and clinical significance of interatrial shunting in patients with atrial septal aneurysm detected by contrast transesophageal echocardiography Angiology 1999, Vol 50, 745~753, Bo-wen Zhao, Katsufumi Mizushige, Tang-chao Xian, Hirohide M彩色多普勒超声心动图诊断先天性三尖瓣闭锁 中国超声医学杂志 1999年15卷增刊1号, 64, 孙亚萍 赵博文声学造影经食道超声心动图对房间隔膨出瘤心房水平分流的研究 中国超声医学杂志 1999年15卷增刊1号, 65,心肌声学造影与多巴酚丁胺负荷超声心动图对慢性冠心病行PTCA术患者的心肌功能及血流灌注特点的对照研究 中国超声医学杂志 1999年15卷增刊1号 ,174, 赵博文 水重克文 渡边一史 高木雄一郎 植田 孝 古本 涉 岩藤泰庆 近藤 功 松尾裕英心脏手术中经食管超声心动图监测的应用 中华胸心血管外科杂志2000年第16卷1期, 42, 何启才 赵博文 李泽坚 王永清 郦志军 叶伟文心肌声学造影与多巴酚丁胺负荷超声心动图对慢性冠心病行PTC术患者的心肌功能及血流灌注特点的对照研究 临床超声医学杂志 2000年2卷 增刊 Page 44 赵博文 杨倩 范晓明 汤富刚 范妙英 吕江红 寿金朵 冼棠超 水重克文 渡边一史 植 田孝 高木雄一郎 松尾裕英彩色多普勒超声心动图诊断先天性三尖瓣闭锁 临床超声医学杂志 2001年15卷 , 64, 孙亚萍 赵博文彩色多普勒超声心动图及心脏声学造影诊断先天性三尖瓣闭锁 中国超声医学杂志 2001年17卷 11期, 874~ 875, 卢一丹 赵博文经心外膜超声心动图在先天性心脏病手术中的应用 中华胸心血管 外科杂志 2001年第17卷6期,345, 何启才何正富 赵博文声学造影经食管超声心动图对房间隔膨出瘤心房水平分流的研究 中华超声影像学杂志 2002年第11卷3期，181~ 182。赵博文 寿金朵 吕江红 范妙英 范晓明 汤富刚 徐海珊 杨倩 冼棠超自制声振微气泡心脏声学造影在先天性心脏病诊断中的应用研究中国超声诊断杂志，2002年第 3卷 第2 期89~91。马新光 赵博文寿金朵 范妙英 吕江红 范晓明 汤富刚 徐海珊 杨 倩 冼棠超术中经食管超声心动图对心脏瓣膜成形术的监测评估研究中国心血管杂志 2002年第 7卷 第 4期 286~287 赵博文 何启才 周大春 王永清 范晓明 汤富刚 范妙英 寿金朵 吕江红 徐海珊床边彩色多普勒超声心动图在急诊及ICU/CCU中的应用价值研究 中华急症医学杂志 2002年 11卷 第3期, 206, 赵博文 鲍德国 潘孔寒 范晓明 汤富刚 范妙英 寿金朵 吕江红 徐海珊 冼棠超术中经食管超声心动图在体外循环主动脉深插管监测中的应用研究 中国超声医学杂志 2002年第18卷第8期, 599~600, 赵博文 吕江红何启才 陈自立 周大春 范妙英 寿金朵 汤富刚 范晓明 徐海珊彩色多普勒超声心动图及心脏声学造影诊断主-肺动脉间隔缺损 中国超声医学杂志 2002年第18卷第9期 赵博文 吕江红 徐海珊 寿金朵 范妙英 汤富刚 范晓明胎儿超声心动图检测胎儿心律失常及其临床意义 中华超声影像学杂志2002年第11卷8期506~507。赵博文 宋伊丽 陈湫波 徐海珊 寿金朵 吕江红 汤富刚 范妙英 范晓明 冼棠超彩色多普勒超声心动图诊断钝性外伤性室间隔缺损1例 中华超声影像学杂志2002年第11卷10 期 615赵博文 范妙英 徐海珊 寿金朵 汤富刚 吕江红 范晓明Evaluation of valvuloplasty using intraoperative transesopghageal echocardiography(TEE) Clinical Medical Journal of C Scientific Sessions Abstracts of The 13th Congress of the International Cardiac Doppler Society(ICDS), Vol 9 Supplement P Zhao Bowen, He Qicai, Zhou Dacun, Wang Yongqing, Fan Xiaomin, Tang Fugang, Fan Miaoying, Shou Jindou, Lu Jianghong, Xu H谐波成像在胎儿超声心动图中的应用研究 中华超声影像学杂志 2002年第11卷11 期 673~ 赵博文 寿金朵 徐海珊 吕江红 范妙英 汤富刚 范晓明胎儿超声心动图检测胎儿三尖瓣反流及其临床意义 中华超声影像 学杂志2002年第11卷11期 694~695 赵博文 宋伊丽 徐海珊 吕江红 寿金朵 汤富刚 范妙英 范晓明彩色多普勒超声诊断移植肾动脉重度狭窄 1例 中国超声医学杂志 2002年第18卷第11期878 徐海珊 冯剑 赵博文术中经食管超声心动图监测冠状动脉旁路移植术同期二尖瓣成形 术1例。中国超声医学杂志 2003年第19卷第1期 64~65 潘美 赵博文 姚向平 王永清彩色多普勒超声对外周血管假性动脉瘤的诊断价值。浙江临床医学2003年第5卷1期 64 吕江红 范晓明 赵博文 汤富刚 范妙英 寿金朵A comparison study of harmonic imaging (HI) and fundamental imaging (FI) in fetal echocardiography。Journal of Zhejiang University(SCIENCE) 2003年4(3): 374~377 Zhao Bo-wen, Tang Fu-gang, Shou Jin-duo, Xu Hai-shan，Lu Jiang-Hong, Fan Miao-yin, Fan Xiao-min, Pan M超声诊断胎儿单心室并永存动脉干1例 中华超声影像学杂志 2003年第12卷 6期 384 潘美 赵博文胎儿超声心动图检测胎儿房性期前收缩的临床研究 中国超声医学杂志 2003年第19卷第7期 赵博文 潘美 宋伊丽 寿金朵 吕江红 徐海珊 汤富刚胎儿超声心动图对胎儿心脏内强回声结构的观察及其临床意义 中华超声影像学杂志 2003年第12卷 8 期 赵博文 潘美 宋伊丽 寿金朵 吕江红 徐海珊 汤富刚 范晓明 范妙英频谱多普勒及 M型超声心动图检测胎儿心律失常的临床应用研究 中国超声医学杂志2003年19卷8期591~594 赵博文 汤富刚 潘美徐海珊 寿金朵 吕江红 范晓明M型及多普勒超声心动图对扩张型心肌病患者Tei Index 的对照研究 临床超声学杂志 2004年 6卷1期 7~11 赵博文 潘 美 寿金朵 徐海珊 吕江红 汤富刚 范晓明 林 莎室间隔缺损并双腔右心室伴感染性心内膜炎多发赘生物1例 中华超声影像学杂志 2004年13卷2期 156 赵博文 潘美Tei 指数综合评估正常胎儿心室功能的定量研究 中华超声影像学杂志 2004年 13卷3期 165~169 赵博文 潘 美 汤富刚 范晓明 寿金朵 吕江红 徐海珊 林 莎Clinical applications of fetal echocardiography in detection of fetal arrhythmia : a retrospective evaluation of 451 fetuses Chinese Medical J ZHAO Bowen 赵博文, ZHANG Songying 张松英 Pan Mei 潘美, XU Haishan 徐海珊, SHOU Jinduo 寿金朵, LU Jianghong 吕江红,TANG Fugang 汤富刚, FAN Miaoying 范妙英, FAN Xiaoming范晓明 and Lin Sha 林莎 2004 Vol 117 3期 474~彩色多普勒超声心动图诊断儿童主动脉缩窄 中国超声医学杂志，2004年20卷3 期 221~222 赵博文 潘 美 罗叶旋 吕江红 寿金朵 徐海珊 林 莎彩色多普勒超声心动图诊断冠状动脉—肺动脉瘘 中国超声医学杂志，2004年20卷 4期 307~309 赵博文 潘 美 汤富刚 寿金朵 吕江红 徐海珊 林 莎胎儿超声心动图的研究进展 国外医学计划生育分册 2004, 23卷2期 潘美, 赵博文胎儿超声心动图检测胎儿心律失常及其临床意义 中华妇产科学杂志，2004年 39卷6期 365~368 赵博文 潘 美 张松英 宋伊丽 徐海珊 寿金朵 吕江红 林 莎 唐海林 《胎儿超声心动图对胎儿心血管畸形及心律失常的检测研究》2002年浙江大学医学院中青年科研启动基金 0万元《胎儿超声心动图对胎儿心血管畸形及心律失常的检测研究》2003年浙江省科学技术厅科技攻关项目，资助经费12万元。《急性冠脉阻塞和再灌注时收缩期及收缩期后室壁改变的动物试验研究》2003年浙江大学医学院附属邵逸夫医院科学基金， 3万元 《临床介入治疗新趋势》。山西高校联合出版社。1995年9月。《实用临床心律失常诊断与治疗》。复旦大学出版社。2003年9月。
Introduction vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 The term sonic is applied to ultrasound waves of very high Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 1013 At such high frequencies it is very difficult for a sound wave to propagate efficiently; indeed, above a frequency of about 25 × 1013 hertz, it is impossible for longitudinal waves to propagate at all, even in a liquid or a solid, because the molecules of the material in which the waves are traveling cannot pass the vibration along rapidly TableMany animals have the ability to hear sounds in the human ultrasonic frequency Some ranges of hearing for mammals and insects are compared with those of humans in the T A presumed sensitivity of roaches and rodents to frequencies in the 40 kilohertz region has led to the manufacture of “pest controllers” that emit loud sounds in that frequency range to drive the pests away, but they do not appear to work as Transducers An ultrasonic transducer is a device used to convert some other type of energy into an ultrasonic There are several basic types, classified by the energy source and by the medium into which the waves are being Mechanical devices include gas-driven, or pneumatic, transducers such as whistles as well as liquid-driven transducers such as hydrodynamic oscillators and vibrating These devices, limited to low ultrasonic frequencies, have a number of industrial applications, including drying, ultrasonic cleaning, and injection of fuel oil into Electromechanical transducers are far more versatile and include piezoelectric and magnetostrictive A magnetostrictive transducer makes use of a type of magnetic material in which an applied oscillating magnetic field squeezes the atoms of the material together, creating a periodic change in the length of the material and thus producing a high-frequency mechanical Magnetostrictive transducers are used primarily in the lower frequency ranges and are common in ultrasonic cleaners and ultrasonic machining By far the most popular and versatile type of ultrasonic transducer is the piezoelectric crystal, which converts an oscillating electric field applied to the crystal into a mechanical Piezoelectric crystals include quartz, Rochelle salt, and certain types of Piezoelectric transducers are readily employed over the entire frequency range and at all output Particular shapes can be chosen for particular For example, a disc shape provides a plane ultrasonic wave, while curving the radiating surface in a slightly concave or bowl shape creates an ultrasonic wave that will focus at a specific Piezoelectric and magnetostrictive transducers also are employed as ultrasonic receivers, picking up an ultrasonic vibration and converting it into an electrical Applications in research One of the important areas of scientific study in which ultrasonics has had an enormous impact is When water is boiled, bubbles form at the bottom of the container, rise in the water, and then collapse, leading to the sound of the boiling The boiling process and the resulting sounds have intrigued people since they were first observed, and they were the object of considerable research and calculation by the British physicists Osborne Reynolds and Lord Rayleigh, who applied the term cavitation to the process of formation of Because an ultrasonic wave can be used carefully to control cavitation, ultrasound has been a useful tool in the investigation of the The study of cavitation has also provided important information on intermolecular Research is being carried out on aspects of the cavitation process and its A contemporary subject of research involves emission of light as the cavity produced by a high-intensity ultrasonic wave This effect, called sonoluminescence, is believed to create instantaneous temperatures hotter than the surface of the S The speed of propagation of an ultrasonic wave is strongly dependent on the viscosity of the This property can be a useful tool in investigating the viscosity of Because the various parts of a living cell are distinguished by differing viscosities, acoustical microscopy can make use of this property of cells to “see” into living cells, as will be discussed below in Medical Ranging and navigating Sonar (sound navigation and ranging) has extensive marine By sending out pulses of sound or ultrasound and measuring the time required for the pulses to reflect off a distant object and return to the source, the location of that object can be ascertained and its motion This technique is used extensively to locate and track submarines at sea and to locate explosive mines below the surface of the Two boats at known locations can also use triangulation to locate and track a third boat or The distance over which these techniques can be used is limited by temperature gradients in the water, which bend the beam away from the surface and create shadow One of the advantages of ultrasonic waves over sound waves in underwater applications is that, because of their higher frequencies (or shorter wavelengths), the former will travel greater distances with less Ranging has also been used to map the bottom of the ocean, providing depth charts that are commonly used in navigation, particularly near coasts and in shallow Even small boats are now equipped with sonic ranging devices that determine and display the depth of the water so that the navigator can keep the boat from beaching on submerged sandbars or other shallow Modern fishing boats use ultrasonic ranging devices to locate schools of fish, substantially increasing their Even in the absence of visible light, bats can guide their flight and even locate flying insects (which they consume in flight) through the use of sonic Ultrasonic echolocation has also been used in traffic control applications and in counting and sorting items on an assembly Ultrasonic ranging provides the basis of the eye and vision systems for robots, and it has a number of important medical applications (see below) The Doppler effect If an ultrasonic wave is reflected off a moving obstacle, the frequency of the resulting wave will be changed, or Doppler- More specifically, if the obstacle is moving toward the source, the frequency of the reflected wave will be increased; and if the obstacle is moving away from the source, the frequency of the reflected wave will be The amount of the frequency shift can be used to determine the velocity of the moving Just as the Doppler shift for radar, an electromagnetic wave, can be used to determine the speed of a moving car, so can the speed of a moving submarine be determined by the Doppler shift of a sonar An important industrial application is the ultrasonic flow meter, in which reflecting ultrasound off a flowing liquid leads to a Doppler shift that is calibrated to provide the flow rate of the This technique also has been applied to blood flow in Many burglar alarms, both for home use and for use in commercial buildings, employ the ultrasonic Doppler shift Such alarms cannot be used where pets or moving curtains might activate Materials testing Nondestructive testing involves the use of ultrasonic echolocation to gather information on the integrity of mechanical Since changes in the material present an impedance mismatch from which an ultrasonic wave is reflected, ultrasonic testing can be used to identify faults, holes, cracks, or corrosion in materials, to inspect welds, to determine the quality of poured concrete, and to monitor metal Owing to the mechanism by which sound waves propagate in metals, ultrasound can be used to probe more deeply than any other form of Ultrasonic procedures are used to perform in-service inspection of structures in nuclear Structural flaws in materials can also be studied by subjecting the materials to stress and looking for acoustic emissions as the materials are Acoustic emission, the general name for this type of nondestructive study, has developed as a distinct field of High-intensity applications High-intensity ultrasound has achieved a variety of important Perhaps the most ubiquitous is ultrasonic cleaning, in which ultrasonic vibrations are set up in small liquid tanks in which objects are placed for Cavitation of the liquid by the ultrasound, as well as the vibration, create turbulence in the liquid and result in the cleaning Ultrasonic cleaning is very popular for jewelry and has also been used with such items as dentures, surgical instruments, and small Degreasing is often enhanced by ultrasonic Large-scale ultrasonic cleaners have also been developed for use in assembly Ultrasonic machining employs the high-intensity vibrations of a transducer to move a machine If necessary, a slurry containing carborundum grit may be used; diamond tools can also be A variation of this technique is ultrasonic drilling, which makes use of pneumatic vibrations at ultrasonic frequencies in place of the standard rotary drill Holes of virtually any shape can be drilled in hard or brittle materials such as glass, germanium, or Ultrasonic soldering has become important, especially for soldering unusual or difficult materials and for very clean The ultrasonic vibrations perform the function of cleaning the surface, even removing the oxide layer on aluminum so that the material can be Because the surfaces can be made extremely clean and free from the normal thin oxide layer, soldering flux becomes Chemical and electrical uses The chemical effects of ultrasound arise from an electrical discharge that accompanies the cavitation This forms a basis for ultrasound's acting as a catalyst in certain chemical reactions, including oxidation, reduction, hydrolysis, polymerization and depolymerization, and molecular With ultrasound, some chemical processes can be carried out more rapidly, at lower temperatures, or more The ultrasonic delay line is a thin layer of piezoelectric material used to produce a short, precise delay in an electrical The electrical signal creates a mechanical vibration in the piezoelectric crystal that passes through the crystal and is converted back to an electrical A very precise time delay can be achieved by constructing a crystal with the proper These devices are employed in fast electronic timing Medical applications Although ultrasound competes with other forms of medical imaging, such as X-ray techniques and magnetic resonance imaging, it has certain desirable features—for example, Doppler motion study—that the other techniques cannot In addition, among the various modern techniques for the imaging of internal organs, ultrasonic devices are by far the least Ultrasound is also used for treating joint pains and for treating certain types of tumours for which it is desirable to produce localized A very effective use of ultrasound deriving from its nature as a mechanical vibration is the elimination of kidney and bladder Diagnosis Much medical diagnostic imaging is carried out with X Because of the high photon energies of the X ray, this type of radiation is highly ionizing—that is, X rays are readily capable of destroying molecular bonds in the body tissue through which they This destruction can lead to changes in the function of the tissue involved or, in extreme cases, its One of the important advantages of ultrasound is that it is a mechanical vibration and is therefore a nonionizing form of Thus, it is usable in many sensitive circumstances where X rays might be Also, the resolution of X rays is limited owing to their great penetrating ability and the slight differences between soft Ultrasound, on the other hand, gives good contrast between various types of soft Ultrasonic scanning in medical diagnosis uses the same principle as Pulses of high-frequency ultrasound, generally above one megahertz, are created by a piezoelectric transducer and directed into the As the ultrasound traverses various internal organs, it encounters changes in acoustic impedance, which cause The amount and time delay of the various reflections can be analyzed to obtain information regarding the internal In the B-scan mode, a linear array of transducers is used to scan a plane in the body, and the resultant data is displayed on a television screen as a two-dimensional The A-scan technique uses a single transducer to scan along a line in the body, and the echoes are plotted as a function of This technique is used for measuring the distances or sizes of internal The M-scan mode is used to record the motion of internal organs, as in the study of heart Greater resolution is obtained in ultrasonic imaging by using higher frequencies—, shorter A limitation of this property of waves is that higher frequencies tend to be much more strongly Because it is nonionizing, ultrasound has become one of the staples of obstetric During the process of drawing amniotic fluid in testing for birth defects, ultrasonic imaging is used to guide the needle and thus avoid damage to the fetus or surrounding Ultrasonic imaging of the fetus can be used to determine the date of conception, to identify multiple births, and to diagnose abnormalities in the development of the Ultrasonic Doppler techniques have become very important in diagnosing problems in blood In one technique, a three-megahertz ultrasonic beam is reflected off typical oncoming arterial blood with a Doppler shift of a few kilohertz—a frequency difference that can be heard directly by a Using this technique, it is possible to monitor the heartbeat of a fetus long before a stethoscope can pick up the Arterial diseases such as arteriosclerosis can also be diagnosed, and the healing of arteries can be monitored following A combination of B-scan imaging and Doppler imaging, known as duplex scanning, can identify arteries and immediately measure their blood flow; this has been extensively used to diagnose heart valve Using ultrasound with frequencies up to 2,000 megahertz, which has a wavelength of 75 micrometre in soft tissues (as compared with a wavelength of about 55 micrometre for light), ultrasonic microscopes have been developed that rival light microscopes in their The distinct advantage of ultrasonic microscopes lies in their ability to distinguish various parts of a cell by their Also, because they require no artificial contrast mediums, which kill the cells, acoustic microscopy can study actual living Therapy and surgery Because ultrasound is a mechanical vibration and can be well focused at high frequencies, it can be used to create internal heating of localized tissue without harmful effects on nearby This technique can be employed to relieve pains in joints, particularly in the back and Also, research is now being carried out in the treatment of certain types of cancer by local heating, since focusing intense ultrasonic waves can heat the area of a tumour while not significantly affecting surrounding Trackless surgery—that is, surgery that does not require an incision or track from the skin to the affected area—has been developed for several Focused ultrasound has been used for the treatment of Parkinson's disease by creating brain lesions in areas that are inaccessible to traditional A common application of this technique is the destruction of kidney stones with shock waves formed by bursts of focused In some cases, a device called an ultrasonic lithotripter focuses the ultrasound with the help of X-ray guidance, but a more common technique for destruction of kidney stones, known as endoscopic ultrasonic disintegration, uses a small metal rod inserted through the skin to deliver ultrasound in the 22- to 30-kilohertz frequency Infrasonics The term infrasonics refers to waves of a frequency below the range of human hearing—, below about 20 Such waves occur in nature in earthquakes, waterfalls, ocean waves, volcanoes, and a variety of atmospheric phenomena such as wind, thunder, and weather Calculating the motion of these waves and predicting the weather using these calculations, among other information, is one of the great challenges for modern high-speed TableAircraft, automobiles, or other rapidly moving objects, as well as air handlers and blowers in buildings, also produce substantial amounts of infrasonic Studies have shown that many people experience adverse reactions to large intensities of infrasonic frequencies, developing headaches, nausea, blurred vision, and On the other hand, a number of animals are sensitive to infrasonic frequencies, as indicated in the T It is believed by many zoologists that this sensitivity in animals such as elephants may be helpful in providing them with early warning of earthquakes and weather It has been suggested that the sensitivity of birds to infrasound aids their navigation and even affects their One of the most important examples of infrasonic waves in nature is in Three principal types of earthquake wave exist: the S-wave, a transverse body wave; the P-wave, a longitudinal body wave; and the L-wave, which propagates along the boundary of stratified L-waves, which are of great importance in earthquake engineering, propagate in a similar way to water waves, at low velocities that are dependent on S-waves are transverse body waves and thus can only be propagated within solid bodies such as P-waves are longitudinal waves similar to sound waves; they propagate at the speed of sound and have large When P-waves propagating from the epicentre of an earthquake reach the surface of the Earth, they are converted into L-waves, which may then damage surface The great range of P-waves makes them useful in identifying earthquakes from observation points a great distance from the In many cases, the most severe shock from an earthquake is preceded by smaller shocks, which provide advance warning of the greater shock to Underground nuclear explosions also produce P-waves, allowing them to be monitored from any point in the world if they are of sufficient The reflection of man-made seismic shocks has helped to identify possible locations of oil and natural-gas Distinctive rock formations in which these minerals are likely to be found can be identified by sonic ranging, primarily at infrasonic
'08 Paris[ Lay Language Paper Index | Press Room ] --------------------------------------------------------------------------------Accurate measurement of distance and velocity using ultrasonic wavesShinnosuke Hirata - jp Department of Information Processing Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology G2-32, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan Minoru Kuribayashi Kurosawa (Tokyo Institute of Technology, Japan) Takashi Katagiri (Sutekina I, Japan) Popular version of paper 1pSPb6 Presented Monday Afternoon, June 30, 2008 Acoustics '08 Paris, Palais des Congrès, Paris, FranceBats use echolocation for environment That is, they use reflected sound waves to measure the distance, the velocity, and the scale of insects or Echolocation includes broadcasting ultrasonic waves and then perceiving echoes reflected from the surface of the T echnological application of echolocation using ultrasonic sensors has been studied and used for environment recognition in autonomous mobile robots, because of two advantages: the advantage of ultrasonic waves which can easily reflect from structures, and the advantage of ultrasonic sensors which are cheap, small, and The method of distance measurement using ultrasonic waves is based on the pulse-echo method, which determines the distance of an object by measurement of time-of-flight (TOF), as illustrated in Figure The TOF is the interval from transmission of an ultrasonic pulse to reception of an echo re flected from the The distance is calculated from the product of the TOF and the acoustic Fig 1: Distance measurement by the pulse-echo The method of velocity measurement using ultrasonic waves is based on the pulse-Doppler When the object is moving, due to the Doppler effect introduced by the motion of the object, the reflected echo is Doppler- The frequency of Doppler-shifted echo is increased or decreased in proportion to the velocity of the Therefore, the pulse-Doppler method determines the velocity of the object by measurement of increase or decrease in the frequency, as illustrated in Figure 2 Fig 2: Velocity measurement by the pulse-Doppler Furthermore, the TOF of the Doppler-shifted echo in Figure 2 is different from the TOF of the echo in Figure The TOF is also Doppler-shifted in proportion to the velocity of the Velocity measurement with high resolution and calibration of the Doppler-shifted TOF is required to measure an accurate distance to the However, frequency analysis by the Fourier transform cannot measure the velocity with high resolution ( velocity resolution: 85 m/s at the window of the Fourier transform : 10 ms) In the proposed method of distance and velocity measurement, two LPM (Linear-period modulated) ultrasonic waves are continuously The period of the LPM signal linearly increases with time as illustrated in Figure 3 The received signal, which includes the reflected echo, is correlated with the LPM signal, which is a cross-correlation operation, as illustrated in Figure 4 Cross-correlation operation is the method for effective improvement of the resolution of the TOF The cross-correlation function of the reflected echo, two continuous LPM signals, and the LPM signal has two The first peak of the cross-correlation function shows the Doppler-shifted TOF, and the interval of the first peak and the second peak shows the length of the LPM signal The length is also Doppler-shifted in proportion to the velocity of the Therefore, the velocity can be calculated from the Doppler-shifted The proposed method can measure the distance and the velocity of the object with high resolution because of high sampling frequency of signal processing (, velocity resolution: 005 m/s at sampling frequency: 5 MHz) Fig 3: The linear-period modulated Fig 4: Design of the proposed method of distance and velocity measurement by transmitting two continuous LPM The measured velocities and their errors, which are examined by computer simulation, are illustrated in Figure The velocity of the object can be measured with high resolution by the proposed By calibrating the Doppler-shifted TOF with the measured velocity , the distance of the moving object can be accurately measured Fig 5: The velocities and their errors measured by the proposed
不是 《声学学报》（中、英文版）两刊，是中国科学院声学研究所主办，中国声学学会、声学学报编辑委员会编辑出版的学术性刊物，刊载具有创造性的声学研究论文、实验性论文和重要应用性论文（包括实验工作、理论和应用研究、仪器研制）。 《声学学报》(ACTA ACUSTICA, Chinese version) and the 《Chinese Journal of Acoustics》 (in English) are the publications of the Institute of Acoustics, The Chinese Academy of Sciences, edited by the Acoustical Society of China and the Editorial Board of Chinese Journal of Acoustics, to publish original works in all branches of acoustics, and to promote the international understanding and collaboration in the field of 《声学学报》(ACTA ACUSTICA, Chinese version) is bimonthly, six issues in a year with about 96 pp of scientific material in each issues, distributed through post office of C ISSN: 0371--0025, CODEN SHGHAS 《Chinese Journal of Acoustics》 (in English) is quarterly, four issues in a year, 96 pages, distributed abroad through Allerton Press I New Y ISSN: 0217--9776, CODEN CJACDS
在国内，核心期刊已经是高水平的期刊了，但真不敢说是最高水平。像二楼一样分类述说更好一些，期刊分很多专业和种类，没个期刊也只能作为这个领域的高水平啊
一部分收一部分不收并不是外文期刊都不收版面费，有一部分外文期刊确实不收版面费，但还有很大一部分外文期刊是收版面费的，而且费用都比较高，一般都是一千到四千美元不等，折合人民币大概几千到几万不等，所以你所说的外文期刊不收版面费是不准确的。不收版面费的期刊，下载全文时可能要付一定的费用。扩展资料：物理学三大期刊物理学报、物理学进展、高压物理学报、工程热物理学报、计算物理、原子核物理评论、原子能科学技术、中国科学（物理学,力学,天文学）、光学学报。中国激光，发光学报，光子学报。声学学报，原子与分子物理学报，光谱学与光谱分析，量子电子学报，量子光学学报，物理，低温物理学报，计算物理，核聚变与等离子体物理，大学物理，波谱学杂志，光散射学报。物理学是研究物质运动最一般规律和物质基本结构的学科。作为自然科学的带头学科，物理学研究大至宇宙，小至基本粒子等一切物质最基本的运动形式和规律，因此成为其他各自然科学学科的研究基础。它的理论结构充分地运用数学作为自己的工作语言，以实验作为检验理论正确性的唯一标准，它是当今最精密的一门自然科学学科。
如果你是假性近视可以通过治疗达到很好的效果，如果是真性近视就只能戴眼镜了，等到视力稳定后可以通过激光治疗近视把眼镜彻底摘掉！麻烦采纳，谢谢!
从小学到高中 从来没有好好做过学校里的眼保健操 但视力无人能及 不清楚自己的视力是几点几 反正各种视力表上有的我都能看得见 算是视力满格了吧同样的 在我们的职业圈子中 也有很多人 不把眼保健操当回事 看书看电视看电脑手机等等 十几个小时也没什么影响 感觉视力好坏还是基因占主导因素吧