ISD单片语音录/放器件及电路设计

指出ＩＳＤ单片语言器件的独特之处，是采用直接模拟存储技术，语音信号以其原本的模拟形式直接存入模拟量存储器中并长远保存。省去了传统的Ａ／Ｄ和Ｄ／Ａ数模转换机制，能高保真的将语音内容再生。这是一种高新录／放技术。另外，给出的ＩＳＤ基本录／放电路十分简单易用。可方便地为微机系统、测控仪表电器和广播等设备所采用，使设备具有高效功能     

中国科学院院士业治铮教授简介

中国科学院院士业治铮教授简介ＢＲＩＥＦＩＮＴＲＯＤＵＣＴＩＯＮＯＦＰＲＯＦ．ＹＥＺＨＩＺＨＥＮＧ，ＡＮＡＣＡＤＥＭＩＣＩＡＮＯＦＡＣＡＤＥＭＩＡＳＩＮＩＣＡ业治铮教授是我国著名的沉积学家，我国海洋地质科学的奠基人之一，中国科学院院士。现任中国海洋地质...     

系统分析在渔业资源、生态环境工程研究中的应用

文章得到相建海、董金海以及邓景耀、李德尚、罗秉 征、唐启升、周名江研究员书面或口头上的帮助，在 此诚表谢意。 中国科学院海洋研究所调查研究报告第２９３５号。ＴＨＥ ＡＰＰＬＩＣＡＴＩＯＮＳ ＯＦ ＳＹＳＴＥＭ ＡＮＡＬＹＳＩＳ ＭＥＴＨＯＤＳ ＩＮ ＦＩＳＨＥＲＹＲＥＳＯＵＲＣＥＳ ＳＴＵＤＹ ＡＮＤ ＥＣＯＬＯＧＩＣＡＬ ＥＮＶＩＲＯＭＥＮＴＡＬ ＥＮＧＩ－ＮＥＥＲＩＮＧ 系统理论与系统分析应用于渔业资源、生态环境工程始于６０年代，现已成为定量研究渔业资源、生态环境工程必不可少的工具之一，并已为大家普遍接受。…     

关于龙门山区二叠纪灰岩飞来峰成因与时代的讨论

关于龙门山区二叠纪灰岩飞来峰成因与时代的讨论ＤＩＳＣＵＳＳＩＯＮＳＯＮＯＲＩＧＩＮＡＮＤＴＩＭＥＯＦＰＥＲＭＩＡＮＬＩＭＥＳＴＯＮＥＫＬＩＰＰＥＩＮＬＯＮＧＭＥＮＭＯＵＮＴＡＩＮＡＲＥＡ四川龙门山地区二叠纪灰岩超覆在中晚侏罗世地层之上的事实，早在我国...     

渤海局部海域风暴潮漫滩计算模式──ADI干湿网格模式在渤海局部海域风暴潮漫滩计算中的应用

采用ＡＤＩ干湿网格模式和一种大小区嵌套式的数值计算格式，考虑了天文潮与风暴潮的非线性耦合效应，对渤海局部海域的风暴潮漫滩进行了数值模拟。模拟结果与实测结果符合良好，证实ＡＤＩ干湿网格模式对海湾风暴潮漫滩计算的可行性。指出ＡＤＩ干湿网格模式对预报淹水受灾范围具有应用价值。     

南海及台湾海峡台风浪的数值计算研究

本文应用ＬＡＧＦＯＦＩＯ的建立第三代海浪模式，采用波数能谱直接模拟海浪谱的方法，进行南海及台湾海峡台风浪的后报和分析计算结果与实测值拟合较好，表明ＦＩＯ－ＳＯＡ方法适用于该海区台风浪的数值计算。     

Use of a new clone of Artemia parthenogenetica (OP1) to increase genetic variation

ＵｓｅｏｆａｎｅｗｃｌｏｎｅｏｆＡｒｔｅｍｉａｐａｒｔｈｅｎｏｇｅｎｅｔｉｃａ（ＯＰ１）ｔｏｉｎｃｒｅａｓｅｇｅｎｅｔｉｃｖａｒｉａｔｉｏｎ￥／／ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒｅａｒｅｐａｌｔｈｅｎｏｇｅｎｅｔｉｃａｎｄｂｉＳｅｘｕａｌｒｅｐｎｄｕ...     

星载SSM／I微波遥感渤海海冰的辐射特征分析

根据我国渤海区域星载微波遥感ＤＭＳＰ ＳＳＭ／Ｉ１９９４￣１９９６年的观察数据的研究,指出现有的星载微波遥感海冰的数据标定和验证ＴＢＩ和ＯＳＩ算法是不适用的。用２２和８５ＧＨｚ的散射指数ＳＩ和１９ＧＨｚ的极化指数ＰＩ,讨论了渤海区域海冰的主要辐射特征,用矢量辐射传输理论数值模拟了ＳＩ、ＰＩ与海冰覆盖及其厚度变化的定量关系,用ＳＩ－ＰＩ图规划了渤海区域性海冰的识别方法,给出了渤海海冰的空间分布及其辐     

星载SSM/Ⅰ微波遥感渤海海冰的辐射特征分析

根据我国渤海区域星载微波遥感ＤＭＳＰＳＳＭ／Ｉ１９９４～１９９６年的观察数据的研究,指出现有的星载微波遥感海冰的数据标定和验证ＴＢＩ和ＯＳＩ算法是不适用的。用２２和８５ＧＨｚ的散射指数ＳＩ和１９ＧＨｚ的极化指数ＰＩ,讨论了渤海区域海冰的主要辐射特征,用矢量辐射传输理论数值模拟了ＳＩ、ＰＩ与海冰覆盖及其厚度变化的定量关系,用ＳＩ－ＰＩ图规划了渤海区域性海冰的识别方法,给出了渤海海冰的空间分布及其辐射特征的时间序列变化。     

盐生隐杆藻多糖的提纯及含量分析

盐生隐杆藻（Ａｐｈａｎｏｔｈｅｃｅｈａｌｏｐｈｙｔｉｃａ）的培养液经透析醇析得胞外粗多糖ＥＰＩ，藻细胞经热水抽提，醇析得胞内粗多糖ＩＰＩ，它们均含有１７种微量元素。ＥＰＩ经脱蛋白，ＩＰＩ经脱蛋白脱色得半精品ＥＰⅡ和ＩＰⅡ，半精品分别经ＤＥ－５２和ＤＥＡＥ－Ｓｅｐｈａｄｅｘ－Ａ－２５柱层析纯化得精品ＥＰⅢ和ＩＰⅢ。它们经纸层析，琼脂糖电泳和ＤＥＡＥ－Ｓｅｐｈａｄｅｘ－Ａ－２５柱层析证明为同一组份。红     

双通道实时数据采集处理系统的设计与实现

本文提出了一种基于 TMS32 0 C31串行接口的双通道实时数据采集处理系统的设计与实现方案 ,该设计以 TMS32 0 C31和 TL C32 0 AD5 0 C为核心器件 ,具有两个独立的 A/D,D/A通道 ,能够实现 32位浮点计算和 16位数据采集与回放。应用该系统进行归一化最小均方误差 (Normal-ized L east Mean Square,NLMS)算法实时自适应噪声抵消实验 ,实验结果表明 ,该系统能够实现实时的自适应噪声抵消 ,可广泛应用于实时语音信号处理等领域。     

深海柱样粒度分维特征及其古海洋学意义

对南海69柱样粒度数据分析表明,晚更新世以来,粒度在0,2～11um的标度范围内具有分形特征,粒度分维值为1．72～2．02,平均1．84。与同期亚北极B2-9柱地层对比,69柱粒度分维值明显比B2—9柱的高,B2—9柱的粒度在0,2～16um标度范围内具有分形特征,粒度分维值为1.74～1．79,平均1．77。同一柱样不同时期粒度分维值明显不同,南海69柱氧同位素1期(冰后期)为1．88,氧同位素2期(冰期)为1．81,温暖的冰后期粒度分维值高且变化幅度大,寒冷的冰期粒度分维值低且变化幅度小,表明粒度分维值对沉积物的形成环境演化具有良好的指示意义。     

利用高速DSP器件实现水下视频图像的数字化

以美国ＴＩ公司的第五代ＤＳＰ器件ＴＭＳ３２０Ｃ５０组成的水下视频图像数字化系统,利用独特的软件采集方法灵活地实现３种不同点阵数的图像数据采集,系统同时采用“内存页扩展”的方式实现了可以达４Ｇｂ（ｂｙｔｅｓ）容量的外部数据存贮的扩展,系统还设计了Ｃ５０芯片与高速Ａ／Ｄ及存取时间为７０ｎｓ的静态ＲＡＭ两种一同速度外设的接口电路,该系统较好地实现了水下视频图像模拟信号在规定时间内的数字化以及相应的数据笮     

A low-density extended acoustic sensor for low-frequency arrays

A novel PVDF hydrophone is described which has a sensitivity of -183 dBV/μPa or better and can be made in lengths from 4 cm to more than 1 m, and in diameters from 8 mm to >40 mm. It is based on a piezoelectric PVDF cable which allows considerable design freedom because of its very great mechanical flexibility and high longitudinal piezoelectric coefficient. The design centres on a helical structure which translates a hydrostatic pressure field into a longitudinal compressive strain in the cable and thus makes use of the very sensitive mode. Excellent pressure stability can be achieved, with devices showing a pressure dependency of 0.04 dB/MPa. The device has a flat frequency response from less than 1 Hz to several kHz and a density in the region of 1800 kg/m³, making it suitable for application in low-frequency sonar     

Transient sonar signal classification using hidden Markov modelsand neural nets

In ocean surveillance, a number of different types of transient signals are observed. These sonar signals are waveforms in one dimension (1-D). The hidden Markov model (HMM) is well suited to classification of 1-D signals such as speech. In HMM methodology, the signal is divided into a sequence of frames, and each frame is represented by a feature vector. This sequence of feature vectors is then modeled by one HMM. Thus, the HMM methodology is highly suitable for classifying the patterns that are made of concatenated sequences of micro patterns. The sonar transient signals often display an evolutionary pattern over the time scale. Following this intuition, the application of HMM's to sonar transient classification is proposed and discussed in this paper. Toward this goal, three different feature vectors based on an autoregressive (AR) model, Fourier power spectra, and wavelet transforms are considered in our work. In our implementation, one HMM is developed for each class of signals. During testing, the signal to be recognized is matched against all models. The best matched model identifies the signal class. The neural net (NN) classifier has been successfully used previously for sonar transient classification. The same set of features as mentioned above is then used with a multilayer perceptron NN classifier. Some experimental results using “DARPA standard data set I” with HMM and MLP-NN classification schemes are presented. A combined NN/HMM classifier is proposed, and its performance is evaluated with respect to individual classifiers     

Gravity effect of spreading ridges: comparison of 2D and spherical models

Because of its importance to many Earth science analyses, it is worth assessing whether gravity modelling can be simplified depending on the intended purpose and required precision. While it is obvious that large-scale gravity studies should account for the sphericity of the Earth, each case should be examined on its own merits. Demonstrations are useful for providing estimates of the errors in much simpler 2D modelling. The example of the Mid-Atlantic Ridge serves to compare “large” 2D and spherical 3D models. My model extends horizontally ±2,000 km (±18°) from the model profile across and along the straight ridge axis (along a great circle) and to a depth of 82 km across the axis. 3D modelling would generally be considered obligatory, but this is not clearly necessary from this study. The density structure is highly idealised, the asthenospheric uplift or lithosphere thinning is simplified. The Bouguer anomaly is fitted by least-squares for the density contrast, and the 2D–3D difference of the results is taken as the error. A lithosphere–asthenosphere density contrast of 86.56 kg/m³ was computed for the 2D model, and 84.14 kg/m³ for the spherical model. The difference is small, in the order of 3%, well within all the other uncertainties. My study shows that despite the significant sphericity of the structure, 2D models are well suited for such ridge studies, or generally for models with a laterally extended layered structure, and that spherical modelling can be applied discriminately.     

人工半封闭港湾有孔虫埋葬群空间分布研究--以江苏连云港港区为例

连云港港区60个表层沉积样品的定量分析表明,与港区水动力、底形等沉积环境条件相适应,该区有孔虫埋葬群可分为口门、湾中、湾顶三大群个组合,并可进一步区分出若干六个亚类组合：（A）湾项浅水区——丰度值最低,胶结壳有孔虫含量最高,活体含量高;（B）鸽岛沉积区——与A紧邻,但以丰度值高相区别;（C）西岸码头深水区——水深,丰度高,活体少,浮游个体多;（D）东侧浅水区——水浅,埋葬群特征与C相近;（E）涨潮三角洲区--沉积物粒径小,丰度高,胶结壳含量最低;（F）口门高能区——以沉积物粒径较低区别于E区.     

Images of the seabed in the Faroe-Shetland Channel from commercial 3D seismic data

A large number of 3D deep seismic surveys in the Faroe-Shetland Channel gives continuous coverage over most of the region. These surveys were designed primarily to image depths in excess of 4 km, use low frequency sources and are recorded at low temporal sample rates. However, commercial 3D data can generate highly detailed images of the seabed due to the high spatial sample rate, typically 12.5 m. This is particularly true in waters below 200 m. Despite geophysical artefacts, the images reveal that there are a number of sedimentary processes at work adjacent to and within this channel. On the West Shetland Shelf, iceberg scouring and moraines reflect the impact of glaciation. On the West Shetland slope there is clear evidence for down-slope processes, such as debris flows, linear erosion channels, basal fans and (one case) slope failure. Along-slope processes are also active as indicated by the presence of sediment waves and contourite mounds. On the floor of the basin, polygonal cracking can be observed. The most spectacular feature appears to be the Judd Deeps, a system of cliffs approximately 200 m high and 40 km across. Traditionally, seabed investigation has been performed using high-resolution surveys. This study shows that deep exploration data can also provide useful images of the seafloor.     

Evolution of Interface Soliton over Topography

Several ray-type 1D and 2D KdV equations for two-layer stratified ocean with topographic effect are derived in detail in the present study.A simplified version of these equations,ray type 1D KdV equation,is used to calculate numerically the disintegration of initial interface soliton from the deep sea to the continental shelf.At the same time,a laboratory experiment is carried out in a 2D stratified flow and internal wave tank to examine the numerical results.A comparison of the numerical results with the experimental results shows that they are in good agreement.The numerical results also show that the ray-type KdV equation has high accuracy in describing the evolution of initial interface waves in shelf/slope regions.Form these results,it can be concluded that the fission process is a dominant generating mechanism of interface soliton packets on the continental shelf.