New Approach to Rock Classification Based on Sparse Representations

In geology, classification and lithological recognition of rocks plays an important role in the area of oil and gas exploration, mineral exploration and geological analysis. In other fields of activity such as construction and decoration, this classification makes sense and fully plays its role. However, this classification is slow, approximate and subjective. Automatic classification curbs this subjectivity and fills this gap by offering methods that reflect human perception. We propose a new approach to rock classification based on direct-view images of rocks. The aim is to take advantage of feature extraction methods to estimate a rock dictionary. In this work, we have developed a classification method obtained by concatenating four (4) K-SVD variants into a single signature. This method is based on the K-SVD algorithm combined with four (4) feature extraction techniques: DCT, Gabor filters, D-ALBPCSF and G-ALBPCSF, resulting in the four (4) variants named K-Gabor, K-DCT, KD-ALBPCSF and KD-ALBPCSF respectively. In this work, we developed a classification method obtained by concatenating four (4) variants of K-SVD. The performance of our method was evaluated on the basis of performance indicators such as accuracy with other 96% success rate.

Generalized Szasz Problems in Normal Classes of Algebras

Let A be a normal class of algebras. In the present paper, we characterize the following four problems for A: for which radical class R, there holds that(1) R(i1∧i2) = R(i1)∧R(i2);(2) R(i1∨i2) = R(i1)∨R(i2);(3) (i1∧i2) =i1∧i2;(4) (i1∨i2) = i1∨i2, for arbitrary algebra a∈A and any i1,i2∈La,where j denotes the ideal of a uniquely determined by R(a/j) = j/j?

Integration of Theory and Practice in Medical Morphology Curriculum in Postgraduate Training:A Flipped Classroom and Case-based Learning Exercise

Objective:The integration of training in theory and practice across the medical education spectrum is being encouraged to increase student understanding and skills in the sciences.This study aimed to determine the deciding factors that drive students'perceived advantages in class to improve precision education and the teaching model.Methods:A mixed strategy of an existing flipped classroom(FC)and a case-based learning(CBL)model was conducted in a medical morphology curriculum for 575 postgraduate students.The subjective learning evaluation of the individuals(learning time,engagement,study interest and concentration,and professional integration)was collected and analyzed after FC-CBL model learning.Results:The results from the general evaluation showed promising results of the medical morphology in the FC-CBL model.Students felt more engaged by instructors in person and benefited in terms of time-saving,flexible arrangements,and professional improvement.Our study contributed to the FC-CBL model in Research Design in postgraduate training in 4 categories:1)advancing a guideline of precision teaching according to individual characteristics;2)revealing whether a learning background is needed for a Research Design course to guide setting up a preliminary course;3)understanding the perceived advantages and their interfaces;and 4)barriers and/or improvement to implement the FC-CBL model in the Research Design class,such as a richer description of e-learning and hands-on practice.Conclusion:Undertaking a FC-CBL combined model could be a useful addition to pedagogy for medical morphology learning in postgraduate training.

NEUMANN PROBLEMS OF A CLASS OF ELLIPTIC EQUATIONS WITH DOUBLY CRITICAL SOBOLEV EXPONENTS

This paper deals with the Neumann problem for a class of semilinear elliptic equations -△u + u =|u|2*-2u+ μ|u|q-2u in Ω, au/ar= |u|(?)*-2u on aΩ, where 2 = 2N/N-2, s=2(N-1)/N-2, 1 <q<2,N(?)3,μ>γ denotes the unit outward normal to boundary aΩ. By vaxiational method and dual fountain theorem, the existence of infinitely many solutions with negative energy is proved.

COMPUTER COMPUTATION OF THE METHOD OF MULTIPLE SCALES-DIRICHLET PROBLEM FOR A CLASS OF SYSTEM OF NONLINEAR DIFFERENTIAL EQUATIONS

The method of boundary layer with multiple scales and computer algebra were applied to study the asymptotic behavior of solution of boundary value problems for a class of system of nonlinear differential equations . The asymptotic expansions of solution were constructed. The remainders were estimated. And an example was analysed. It provides a new foreground for the application of the method of boundary layer with multiple scales .

ON A NEW CLASS OF FUNCTION SPACES

In this paper we shall introduce a class of new function spaces. They are generalizations of some Orlicz spaces and Orlicz-Sobolev spaces, and they are derived from the results of the investigation on imbedding relations between some Orlicz-Sobolev spaces.

ON THE MINIMUM OF A CLASS OF NONLINEAR FUNCTIONALS

In this paper, we will introduce the definition of a class of nonlinear functionals and some examples about it and then offer a theorem of the minimum about a class of nonlinear functionals on the close central ball in the metric linear space with 'β-degree circular homogeneous' metric.

A CLASS OF COMMUTATIVE RINGS WITH PRIME FORMULAS

Model theory is usually regarded as a comparatively abstract branch of mathematical logic. In this paper we will record, along the same line as what was done in [1], another one of our trials of finding new applications of model-theoretic conclusions to other branches of mathematics, Considering certain residue class rings of the ring I of

ON INITIAL VALUE PROBLEM OF A CLASS OF DEGENERATE EQUATION

<正> Ⅰ.INTRODUCTION The initial value problem of degenerate equation as is well-known, has the so-called discrete phenomena in C~∞ If it is discussed in a class of analytic functions, then the initial value problem has another strange phenomena, that is, the solution of the equation (p≠0) is determined entirely by only one initial value conditiont.This shows that the degenerate equation

A CLASS OF PROBABILISTIC LINEAR NORMED SPACES AND RANDOM OPERATORS

The concept of probabilistic metric spaces was introduced by Menger in 1942.Based on the similar idea, the concept of random normed spaces (i. e. probabilistie linear normed spaces) was presented by Serstnev.Since then, Bocsan, Dumitrescu and You Zhaoyong et al. have been working in this field. In this paper, based upon the study of a class of probabilistic linear normed spaces: B-spaces, we study random operators, which can be used as one of new

腹腔镜局部进展期远端胃癌D2根治术标准操作流程:CLASS-01研究共识

腹腔镜对比开腹手术治疗局部进展期远端胃癌的前瞻性、多中心、随机对照研究(CLASS-01),为局部进展期胃癌微创外科提供了高级别循证医学证据。结果表明,经验丰富的团队实施腹腔镜远端胃癌D2根治术治疗局部进展期患者是安全、有效的,具有显著的微创优势。这一研究成果引起了学术界的广泛关注。为了在临床实践中正确地认识和科学地应用该研究的成果,本文发布CLASS-01研究共识,以飨读者。内容包括相关定义、手术适应证、器械准备、围手术期处理、手术原则与标准操作流程以及质量控制等关键问题。相关标准操作流程是CLASS-01研究方案撰写时,研究者之间达成的共识,其中的基本原则参考了国际国内权威指南,也充分考虑了我国腹腔镜胃癌外科的实际状况,对我国局部进展期胃癌腹腔镜外科技术的科学发展与合理推广,具有重要的指导意义。

A CLASS OF STRONGLY NONLINEAR SINGULARLY PERTURBED INTERIOR LAYER PROBLEMS

In this paper, a class of strongly nonlinear singularly perturbed interior layer problems are considered by the theory of differential inequalities and the corrective theory of interior layer. The existence of solution is proved and the asymptotic behavior of solution for the boundary value problems are studied. And the satisfying result is obtained.

GLOBAL EXISTENCE FOR A CLASS OF SYSTEMSOF NONLINEAR WAVE EQUATIONS INTHREE SPACE DIMENSIONS

Consider a system of nonlinear wave equations (e)2t-c2i△xui=Fi(u,(e)u,(e)x(e)u) in (0,∞)×(R)3 for i=1,┈,m,where Fi(i=1,┈,m) are smooth functions of degree 2 near the origin of their arguments, and u=(u1,┈,um),while (e)u and (e)x(e)u represent the first and (second derivatives of u, respectively. In this paper, the author presents a new class of nonlinearity for which the global existence of small solutions is ensured. For example, global existence of small solutions for((e)2t- c21Δx)u1 = u2((e)tu2) + arbitrary cubic terms,((e)2t - c22Δx)u2=u1((e)tu2) + ((e)tu1)u2 + arbitrary cubic termswill be established, provided that c21 ≠ c22.

ON THE RELIABILITY BOUNDS IN κ-HNBUE AND κ-HNWUE CLASSES

k-HNBUE class and its dual were introduced by Basu and Ebrahimi [2]. In this paper wegive a generalized definition, and discuss their reliability bounds based on the known mean.

右股外侧皮神经变异1例

笔者在行一男性右下肢标本解剖时,发现该标本股外侧皮神经(LFCN)跨髂嵴上缘距右髂前上棘(ASIS)约9cm处穿腹内、外斜肌浅出,且该股外侧皮神经与髂腹下神经共干起源(图1)。与《中国人解剖学数值》中股外侧皮神经出腹股沟韧带的描述比较,该标本股外侧皮神经的走行存在变异^([1])。为积累国人股外侧皮神经资料,现将该变异报道如下。

A CLASS OF PP L-STATISTICS FOR TESTS

Applying projection pursuit (PP) techniques, this paper takes L-statistics as projectionindices to construct a class of statistics for multivariate tests. The asymptotic distributions ofthe test statistics under null hypothesis are derived theoretically. Some simple applications tolocation and dispersion problems are given.

HIV相关隐球菌脑膜炎免疫重建综合征研究进展

免疫重建综合征是HIV相关隐球菌脑膜炎常见的并发症,该并发症的发生增加了HIV相关隐球菌脑膜炎的死亡率。目前,对于HIV相关隐球菌脑膜炎免疫重建综合征的发病机制尚不清楚,给该病的防治带来了困难。本文综述了HIV相关隐球菌脑膜炎免疫重建综合征发病机制、危险因素及诊疗新进展。

影响中国人群心理健康的人口因素及机制——基于省级面板数据的实证研究

目的:分析城镇化、老龄化、人口流动率对医院精神科就诊比例的影响以及独居率的调节作用。方法:基于2010—2019年省级面板数据和Hausman-Taylor模型进行实证研究。结果:城镇化和人口流动率分别与医院精神科就诊比例负相关和正相关。城镇化与老龄化的交互项、城镇化与独居率的交互项均与医院精神科就诊比例负相关,老龄化与独居率的交互项与医院精神科就诊比例正相关。结论:城镇化和人口流动分别是中国人群心理健康的保护因素和风险因素,城镇化改善了老龄化对中国人群心理健康的不利影响。独居率的上升扩大了城镇化对心理健康的保护作用,加深了老龄化带来的心理健康问题。推进新型城镇化的同时,需重视农村老年人口、流动人口以及独居人口的心理健康评估和干预。

鸡骨草辛素合成工艺及质量评价研究

以对香豆酸和L-酪氨酸甲酯为前体开展鸡骨草辛素合成研究,通过时间和溶剂考察确定最佳工艺为:先光合成4,4′-二羟基-α-吐昔酸,再将其与L-酪氨酸甲酯、N,N′-二环己基碳二亚胺和1-羟基苯并三唑按摩尔比1∶2.2∶2∶2投入二氯甲烷和二甲基甲酰胺混合反应溶剂中(体积比1∶1),室温反应15 h,分离中间体,再加入含0.01 mol·L^(-1)氢氧化钠的50%甲醇水溶液,脱甲基反应15 h,柱层析分离出目标产物。经g级放大试验,鸡骨草辛素总产率稳定在95%,粗品纯度大于90%,重结晶后纯度可达98%。UPLC法可用于鸡骨草辛素含量测定,其回归方程为y=8 684.1x+24.352(r=0.999 9),在0.020 08~0.401 6μg之间与峰面积具有良好的线性关系。本文研究结果为鸡骨草辛素进一步的研究和应用奠定基础。

国际传播视域下儒家文化的世界影响及其价值

儒家文化作为中华优秀传统文化和中华文明的精神标识,不仅是民族的,也是世界的,具有普适价值,在不同历史时期对东亚文化乃至欧美西方国家的哲学、文学和伦理学都产生了重要影响,与世界不同文化美美与共,交融共生。在新的历史时代,面对百年未有之大变局和当下全球治理面临的和平赤字、发展赤字、治理赤字和信任赤字等诸多挑战,儒家文化的独特价值和社会能动性更加彰显。推动构建人类命运共同体,世界更加需要儒家文化,更加需要深化文明交流互鉴,消弭分歧,包容合作,建设持久繁荣的和谐世界。