Cyclic Sequences, Events and Evolution of the Sino-Korean Plate, with a Discussion on the Evolution of Molar-tooth Carbonates, Phosphorites and Source Rocks

This paper gives an account of the research that the authors conducted on the cyclic sequences, events and evolutionary history from Proterozoic to Meso-Cenozoic in the Sino-Korean plate based on the principle of the Cosmos-Earth System. The authors divided this plate into 20 super-cyclic or super-mega-cyclic periods and more than 100 Oort periods. The research focused on important sea flooding events, uplift interruption events, tilting movement events, molar-tooth carbonate events, thermal events, polarity reversal events, karst events, volcanic explosion events and storm events, as well as types of resource areas and paleotectonic evolution. By means of the isochronous theory of the Cosmos-Earth System periodicity and based on long-excentricity and periodicity, the authors elaborately studied the paleogeographic evolution of the aulacogen of the Sino-Korean plate, the oolitic beach platform formation, the development of foreland basin and continental rift valley basin, and reconstructed the evolution

Genetic Types of Meter-Scale Cyclic Sequences and Fabric Natures of Facies Succession

Different genetic types of meter-scale cyclic sequences in stratigraphic records result from episodic accumulation of strata related to Milankovitch cycles. The distinctive fabric natures of facies succession result from the sedimentation governed by different sediment sources and sedimentary dynamic conditions in different paleogeographical backgrounds, corresponding to high-frequency sea-level changes. Naturally, this is the fundamental criterion for the classification of genetic types of meter-scale cyclic sequences. The widespread development in stratigraphic records and the regular vertical stacking patterns in long-term sequences, the evolution characters of earth history and the genetic types reflected by specific fabric natures of facies successions in different paleogeographical settings, all that show meter-scale cyclic sequences are not only the elementary working units in stratigraphy and sedimentology, but also the replenishment and extension of parasequence of sequence stratigraphy. Two genetic kinds of facies succession for meter-scale cyclic sequence in neritic-facies strata of carbonate and clastic rocks, are normal grading succession mainly formed by tidal sedimentation and inverse grading succession chiefly made by wave sedimentation, and both of them constitute generally shallowing upward succession, the thickness of which ranges from several tens of centimeters to several meters. The classification of genetic types of meter-scale cyclic sequence could be made in terms of the fabric natures of facies succession, and carbonate meter-scale cyclic sequences could be divided into four types: L-M type, deep-water asymmetrical type, subtidal type and peritidal type. Clastic meter-scale cyclic sequences could be grouped into two types: tidal-dynamic type and wave-dynamic type. The boundaries of meter-scale cyclic sequences are marked by instantaneous punctuated surface formed by non-deposition resulting from high-frequency level changes, which include instantaneous exposed punctuated surface, drowned punctuated surface as well as their relative surface. The development of instantaneous punctuated surface used as the boundary of meter-scale cyclic sequence brings about the limitations of Walter's Law on the explanation of facies distribution in time and space, and reaffirm the importance of Sander's Rule on analysis of stratigraphic records. These non-continuous surface could be traced for long distance and some could be correlative within same basin range. The study of meter-scale cyclic sequences and their regularly vertical stacking patterns in long-term sequences indicate that the research into cyclicity of stratigraphic records is a useful way to get more regularity from stratigraphic records that are frequently complex as well as non-integrated.

Almost perfect sequences based on cyclic difference sets

The perfect sequences are so ideal that all out-of-phase autocorrelation coefficients are zero, and if the sequences are used as the coding modulating signal for the phase-modulated radar, there will be no interference of side lobes theoretically. However, it has been proved that there are no binary perfect sequences of period 4 〈 n ≤ 12100. Hence, the almost perfect sequences with all out-of-phase autocorrelation coefficients as zero except one are of great practice in engineering. Currently, the cyclic difference set is one of most effective tools to analyze the binary sequences with perfect periodic autocorrelation function. In this article, two characteristic formulas corresponding to the autocorrelation and symmetric structure of almost perfect sequences are calculated respectively. All almost perfect sequences with period n, which is a multiple of 4, can be figured out by the two formulas. Several almost perfect sequences with different periods have been hunted by the program based on the two formulas and then applied to the simulation program and practical application for ionospheric sounding.

GAUSS PERIODS AND CYCLIC CODES FROM CYCLOTOMIC SEQUENCES OF SMALL ORDERS

Let p =ef +1 be an odd prime with positive integers e and f. In this paper, we calculate the values of Gauss periods of order e =3, 4, 6 over a finite field GF(q), where q is a prime with q≠p. As applications, several cyclotomic sequences of order e =3, 4, 6 are employed to construct a number of classes of cyclic codes over GF(q) with prime length. Under certain conditions, the linear complexity and reciprocal minimal polynomials of cyclotomic sequences are calculated, and the lower bounds on the minimum distances of these cyclic codes are obtained.

Base-level Chang and Sequence Stratigraphy of Lishu Fault Lacustrine Basin

Base-level is a kind of surface which controls sedimentation and erosion. So, it can be concluded that it is base-level change that controls the formation and internal structure of a sequence. A single cycle of base-level change can generate four sets of different stacking patterns. They are two sets of aggradation, one progradation and one retrogradation, which affects the features of the internal structure of a sequence. Lishu fault subsidence of Songliao basin is a typical half-graben lacustrine basin. Comprehensive base-level change analysis indicates that six base-level cycles and their related six sequences can be recognized between T 4 and T 5 seismic reflection surface. The contemporaneous fault is the main controlling factor of the fault lacustrine basin. There are obvious differences exist in the composition of sedimentary systems and all systems tracts between its steep slope (the side that basin control fault existed) and flat slope. Except highstand systems tract is composed of fan delta-lacustrine system, lowstand systems tract, transgressive systems tract and regressive systems tract are all made up of fan delta-underwater fan-lacustrine sedimentary systems in the side of steep slope.

Sequence Stratigraphic Features of Mesozoic－Cenozoic Nonmarine Sediments in Eastern China

The basic concepts of sequence stratigraphy can be applied to any cyclic successions regardless of their origin being marias or nonmarine .The storm base can be taken as the base level at the gentle slope side of a faulted basin for distinguishing the systems tractS as no shelf edge is present in nonmarihe fault6d basins. Most of coatinuous rethetions with high amplitude in seismic sections, misunderstood previously as the boundaries of stratigraphic unit, are maximum flooding surface (MFS)in fact. Abundant and diversified microfossils and nannofossils high content of organic carbon,various authigenic minerals such as glauconie,siderite are concentrated nearby these surfaces. It means that the open sea water invaded iato the faulted basins many times in Cretaceous and Paleogene, which make a restricted environment favourable for oil generation. The trend of lake level changes is similar to that of Haq's curve generally, however, the influence of local movements and autostrahgraphic events have to be colandered. The stratal patterns and models of nonmarine sequence are proposed.

基于CNN-LSTM的MIMO-OFDM信号盲调制识别算法

无线通信信号的盲调制识别技术作为非协作通信的核心技术之一,在提高频谱利用效率以及未知信号解调中起着至关重要的作用。另外,非协作通信中存在着电磁环境未知,噪声干扰严重,信噪比低等问题,因此在非协作通信下进行未知信号的盲调制识别较为困难。为解决非协作通信中多输入多输出正交频分复用(MultipleInput Multiple-Output Orthogonal Frequency Division Multiplexing, MIMO-OFDM)信号在低信噪比下子载波盲调制识别的问题,本文使用CNN(Convolutional Neural Network,CNN)网络与LSTM(Long Short-Term Memory,LSTM)网络构建一维CNN-LSTM网络进行盲调制识别。鉴于I/Q数据具有很强特征表达能力,该算法选取I/Q数据作为第一输入特征直接输入网络。同时为了弥补噪声对I/Q数据的干扰,本文还选用抗噪声能力强的循环谱作为另一输入特征,为进一步提升循环谱的抗噪声能力,本文对循环谱进行切片累加操作得到抗噪声性能更好的循环谱切片累加序列作为第二输入特征。仿真结果表明,本文所提方法可以在SNR=2 dB条件下实现对{BPSK,QPSK,8PSK,16QAM,32QAM,128QAM}调制方式的识别,并且识别精度达到98%。

铜绿假单胞菌单PilZ结构域蛋白PA0012和PA4324突变体生物学表型的初步筛选

目的 本研究以铜绿假单胞菌单PilZ结构域的环二鸟苷酸受体蛋白PA0012和PA4324为研究对象,研究这2个蛋白对生物学表型的影响。方法 本研究首先利用同源重组的方法对编码PA0012和PA4324蛋白的基因进行了敲除,得到敲除突变体菌株ΔPA0012和ΔPA4324。然后,将实验分为3组,以野生型菌株PAO1为对照,用这2个突变体进行了表型筛选,包括群集运动能力、感染生菜的能力、对线虫的致病力和蛋白酶活性等,采用单因素方差分析对各组间的差异进行统计分析。随后对这2个突变体和野生型菌株进行了RNA测序,分析2个单PilZ结构域蛋白突变导致的基因差异表达,在转录水平上综合分析2个蛋白对生物学表型的影响。结果 本研究发现这2个单PilZ结构域蛋白的突变均能导致铜绿假单胞菌的群集运动增强,感染生菜的能力减弱,对线虫的毒性和蛋白酶活性的影响则无显著变化。RNA测序结果表明,这2个蛋白突变均可导致铜绿假单胞菌中大量基因的差异表达,且有一些共同的差异基因。结论 铜绿假单胞菌的PA0012和PA4324突变均能增强其群集运动和减轻其对生菜的感染,为后续机制研究奠定了基础。

基于双序列反序的(4,L)规则girth-8 QC-LDPC短码

围长较大的短码长准循环(QC)低密度奇偶校验(LDPC)码的显式构造对于QC-LDPC短码的理论研究与工程应用具有重要意义。首先提出一种基于成对策略的贪婪搜索算法,并根据此算法在列重J为4时的经验结果,归纳总结出一种具有双序列反序特征的指数矩阵。随后证明了该指数矩阵对于任意行重L均对应于围长为8的QC-LDPC码。与现有的典型显式构造方法即最大公约数(GCD)方法相比,新QC-LDPC码提供的码长显著降低。最后,将指数矩阵的拆分拼接和掩膜处理技巧与新QC-LDPC码结合起来,设计出了译码性能在高信噪比区超过5G NR LDPC码的合成码。

基于Stanley序列的QC-LDPC码新颖构造方法

针对准循环低密度奇偶校验(quasi-cyclic low-density parity-check,QC-LDPC)码的短环结构会严重影响码字纠错性能的问题,基于Stanley序列(Stanley sequence,SS)提出一种围长至少为8的QC-LDPC码新颖构造方法。从Stanley序列中选取某些特定元素构成一个呈递增关系的集合,利用穷举算法搜索出满足无环4和环6条件的元素得到另一个递增集合,构造相应的指数矩阵,得到其奇偶校验矩阵。仿真结果表明,在误码率(bit error rate,BER)为10-6时,所构造的SS-QC-LDPC码与同码率码长的其他QC-LDPC码码型相比,其净编码增益均有一定提升,因而其纠错性能较好,且无错误平层现象。此外,该构造方法的计算复杂度较低。

基于原模图的8环QC-LDPC码构造方法

针对当前准循环低密度奇偶校验(Quasi-Cyclic Low-Density Parity-Check,QC-LDPC)码存在短环及纠错性能不够好的问题,基于原模图提出一种新颖的QC-LDPC码构造方法。该方法选择码长码率可灵活调整的原模图作为基矩阵,再结合具有特殊性质的卢卡斯数列和等差数列,通过原模图的低译码门限和数列的特殊性质,构造校验矩阵环长至少为8,且所需存储空间少,易于硬件实现。仿真结果表明:该方法构造的PLA-QC-LDPC(2400,1200)码与同等码长码率中基于卢卡斯数列和最大公约数序列的可快速编码的非规则LG-QC-LDPC码、基于素数和乘法表构造的PM-QC-LDPC码以及基于原模图和消除基本陷阱集的非规则PL-QC-LDPC码相比,净编码增益均有一定程度的提高。

一种循环谱特征提取的直扩信号智能识别方法

为解决传统信号识别方法对直接序列扩频信号识别率低、智能化程度不高等问题,提出一种基于循环谱特征提取的直扩信号智能识别算法。在深入分析直扩信号循环谱特征基础上,以直扩信号循环谱独特的稀疏特性为依据,设计一种稀疏滤波-卷积神经网络模型对提取的循环谱等高线图进行识别,采用无监督预训练和有监督训练微调的方式对网络参数进行更新,提升网络对信号整体特征的表达能力和对小数据量信号样本的学习能力。仿真结果表明:本文算法能够有效识别直接序列扩频信号,在不低于-10 dB高斯噪声条件下对采用正交相移键控调制的直扩信号识别准确率达到98%以上;在混合其他调制信号条件下,相较于常见的几种深度学习算法,本文提出的算法具有更高的识别准确率和鲁棒性。

新型直接序列扩频通信方法

针对传统直接序列扩频通信复杂多径环境下性能受限且频谱利用效率低的问题,提出了一种时频混合直接序列扩频接收机结构的循环前缀(CP)块传输结构扩频系统,采用频域最大比合并(MRC)同时实现均衡和解扩过程,在获得最佳接收性能的同时,省略了IFFT过程,显著降低了计算复杂度。在此基础上,提出了利用恒包络零自相关(CAZAC)序列取代m序列作为扩频序列,在不增加计算复杂度的同时显著提升系统的性能。最后,提出了一种基于循环码移位键控(CCSK)的高速扩频通信方法,解决了传统直接序列扩频频谱利用效率低、传输速率受限的问题,并利用傅里叶变换时域循环移位的性质,设计了一种低实现复杂度的CCSK解扩方法,将CCSK解扩所需的乘法次数由O(N^(2))降为O(Nlog N),极大减少了资源消耗。仿真结果表明,相较于已有直接序列扩频方法,所提方法无论是在高斯还是复杂多径信道环境下均获得了3 dB左右的性能增益。

Linear recurring sequences and subfield subcodes of cyclic codes

Linear recurring sequences over finite fields play an important role in coding theory and cryptography. It is known that subfield subcodes of linear codes yield some good codes. In this paper, we study linear recurring sequences and subfield subcodes. Let Mqm(f(x)) denote the set of all linear recurring sequences over Fqm with characteristic polynomial f(x) over Fqm . Denote the restriction of Mqm(f(x)) to sequences over Fq and the set after applying trace function to each sequence in Mqm(f(x)) by Mqm(f(x)) | Fq and Tr( Mqm(f(x))), respectively. It is shown that these two sets are both complete sets of linear recurring sequences over Fq with some characteristic polynomials over Fq. In this paper, we firstly determine the characteristic polynomials for these two sets. Then, using these results, we determine the generator polynomials of subfield subcodes and trace codes of cyclic codes over Fqm .

濮城油田沙三上地层基准面旋回及储层流动单元

根据基准面旋回和可容纳空间变化原理 ,研究了东濮凹陷濮城油田沙三上亚段长期、中期、短期基准面旋回 ,划分出长期基准面旋回 1个、中期基准面旋回 10个、短期基准面旋回 5 0个 ,并对三种类型的短期基准面旋回结构特征及分布进行了详细描述。在高分辨率层序地层划分对比的基础上 ,建立了高精度层序地层格架。利用储层非均质性的层次性及流动单元层次性与基准面旋回级次性的相关性 ,对储层流动单元进行了划分 ,为精细储层研究提供了一种新的思路。

环脂肽氨基酸顺序的质谱测定

从一株枯草芽孢杆菌的培养液中分离得到一种生物表面活性剂,红外光谱、茚三酮显色及质谱分析表明它是一种具有环状结构的脂肽.质谱显示脂肽的脂肪酸部分为β羟基脂肪酸;氨基酸分析表明肽部分由4个亮氨酸、1个天门东氨酸、1个缬氨酸和1个谷氨酸组成.利用串联飞行时间质谱测定了环脂肽的分子量及质谱图.根据分子量的氮规则和质谱碎片产生的简单断裂、双氢转移机制、McLafferty等单氢重排机制,直接确定了未水解的环脂肽中脂肪链的长度以及氨基酸连接的顺序.质谱中的峰可以得到合理解释.确定了该环脂肽的环状结构.

米级旋回层序的成因类型及其相序组构特征

与米兰柯维奇旋回存在成因联系的幕式地层堆积作用的结果 ,是在地层记录中形成各种类型的米级旋回层序。在不同的古地理背景中 ,受物质来源及沉积动力学背景的控制 ,故发育具有不同相序组构的不同类型的米级旋回层序。因此 ,相序组构特征就成为米级旋回层序类型划分的基本准则。地层记录中米级旋回层序的广泛发育 ,以及它们在长周期层序中的有序垂直叠加形式和地史演化特征 ,由不同相序组构所反映的成因类型以及由不同类型所指示的沉积动力背景等等 ,不但表明了米级旋回层序是描述地层结构的基本工作单元 ,而且是对“准层序”的延展和补充。在海相地层中 ,不管是碳酸盐岩还是陆源碎屑岩地层 ,这种厚几厘米至几米的米级旋回层序 ,大致都可以划分为正粒序和反粒序两种相序组构 ,正粒序组构主要是潮汐作用的结果 ,而反粒序主要是以波浪作用为主的浅海环境的产物 ;不管是正粒序还是反粒序序列 ,均构成总体向上变浅序列。由此 ,碳酸盐岩米级旋回层序可划分为L—M型、深水非对称型、潮下型及环潮坪型 ;碎屑岩米级旋回层序可划分为潮汐动力型及波浪动力型。米级旋回层序的界面是由高频率海平面变化所产生的非沉积作用面 ,包括瞬时暴露间断面和瞬时加深淹没间断面乃至它们的相关面 ,这些在区域上延伸较远 ,甚至?

塔里木盆地巴楚地区石炭系高频旋回层序分析

高频旋回层序是海平面高频振荡的结果和产物。通过对塔里木盆地巴楚地区石炭系地面、钻井剖面的详细解析，首次总结出７个高频旋回层序类型，识别出５０余个五级（或六级）高频旋回层序，它们在纵向上有规律地组合、叠加，组成８个四级旋回层序，３个三级旋回层序及２个二级旋回层序，构成了塔里木盆地巴楚地区石炭系的层序地层格架，同时也反映了该区石炭纪海平面的变化规律及其沉积响应。

Fischer图解及其在旋回层序研究中的应用──以北京西山张夏组为例

Ｆｉｓｃｈｅｒ图解（又称为容纳空间图解）为人们研究沉积旋回在空间上的叠置规律、相对海平面变化、层序级次的划分以及地层层序对比等提供了一种客观实用的方法。本文较详细地讨论了该图解的绘制方法及应注意的问题。运用该图解，将北京西山下苇甸剖面张夏组划分为１个大的三级旋回层序和４个四级旋回层序，根据图解反映的相对海平面变化讨论了旋回层序与构造运动间的关系，提出华北板块晚寒武世之前的＂翘翘板运动＂应始于中寒武世张夏期之早期到中期。

四川盆地须家河组层序地层格架及沉积体系分布规律探讨

不同学者针对四川盆地上三叠统地层特征及沉积演化规律从不同角度进行了诸多研究,但各自获得的地质认识却存在一定的差异。为此,在地表露头和钻测井资料分析、地震层序分析的基础上,将四川盆地须家河组划分为2个超长期基准面旋回层序,为须上盆、须下盆2大成盆期的沉积响应;盆地周缘造山旋回变化是控制2大成盆期砂体分布的主导因素,纵向上总体具阶梯状分布特征,由坳陷中心向周边逐层超覆并阶梯状退积。须家河组主要为陆相河湖三角洲沉积体系,主要发育冲积扇—冲积平原—曲流河或辫状河三角洲—湖泊和冲积扇—扇三角洲—湖泊沉积体系模式。须下盆沉积体系受西低东高大型缓坡古地貌特征控制,总体具有不对称分布特点,湖盆中心位于川西坳陷中南段;前陆造山对须上盆沉积体系分布具有明显的控制作用,沉积体系呈近于对称的环带状分布,前陆隆起及湖盆东移,湖盆走向明显的受古龙门山控制。