Extrapolated Tikhonov method and inversion of 3D density images of gravity data

Tikhonov regularization（TR） method has played a very important role in the gravity data and magnetic data process. In this paper, the Tikhonov regularization method with respect to the inversion of gravity data is discussed. and the extrapolated TR method（EXTR） is introduced to improve the fitting error. Furthermore, the effect of the parameters in the EXTR method on the fitting error, number of iterations, and inversion results are discussed in details. The computation results using a synthetic model with the same and different densities indicated that. compared with the TR method, the EXTR method not only achieves the a priori fitting error level set by the interpreter but also increases the fitting precision, although it increases the computation time and number of iterations. And the EXTR inversion results are more compact than the TR inversion results, which are more divergent. The range of the inversion data is closer to the default range of the model parameters, and the model features and default model density distribution agree well.

不老的开拓者——“英国布鲁斯之父”约翰·梅奥尔

要是有谁准备来写现代摇滚乐史,那么他准不会落掉一个一辈子都没有搞过摇滚的人——约翰·梅奥尔(John Mayall),国际流行乐坛尽人皆知的“英国布鲁斯之父”。给摇滚修史扯上“布鲁斯(Blues)之父”,这不是风马牛不相及吗?非也。因为布鲁斯乃是摇滚乐诞生的根源,而约翰·梅奥尔1963年组创的“布鲁斯开拓者乐队”又是英国早期节奏与布鲁斯和后期以布鲁斯为基础的摇滚乐之间的桥梁。肩负“铺路架桥”重任的梅奥尔在振兴布鲁斯乐在英国发展的同时,也为摇滚乐的壮大扶植了一批杰出的乐手——当年他在乐队中不仅是主唱,而且还身兼键盘和口琴吹奏者,与他合作过的几位吉它手则先后组创或加盟一些著名的摇滚乐队成为璀璨的摇滚巨星:彼得·格林参加了“笑利特伍德·麦克”乐队,米克·泰勒于1969年加盟“滚石”乐队,约翰·麦维则投到“犯人”乐队旗下;最出色的乐手埃里克·科慕普顿则成功地使“奶油”乐队大放异彩……

小蝇子历险记(4)

可怕的拍子芊芊和维维跟着蚊子军团,历尽千辛万苦,终于到达了城市。现在,他们都在努力地找着房间的入口。突然,前方的墙壁上射出一道圆形的光柱。芊芊快速飞过去一看,原来,这是一个用来安装空调管的孔洞,可以一直通到屋子里。"我们从这里进去。"芊芊喜出望外,高声招呼大家从孔洞里钻进去。蚊子们一飞进屋子,就在各个角落潜伏起来,静静地等待着下口的机会。

微播报

@夏萌鳄鱼先生MOTOGP首战结束,洛伦佐以两秒的巨大优势领跑完赛,并在正赛跑进1分54秒尾,刷新了赛道纪录;杜卡迪的Desmo16表现强劲,Iannone非常抢眼,可惜过早摔车离赛,队友多维则以第二名的成绩稳定完赛;马奎兹在最后5圈和多维小争第二,无奈输了最后一个弯;37岁的老将罗西还能跟上第一集团的节奏,以第四名完赛。

GRAPH GRAMMAR METHOD FOR 3-D CORNER DETECTION

Most of local feature descriptors assume that the scene is planar. In the real scene, the captured images come from the 3-D world. 3-D corner as a novel invariant feature is important for the image matching and the object detection, while automatically discriminating 3-D corners from ordinary corners is difficult. A novel method for 3-D corner detection is proposed based on the image graph grammar, and it can detect the 3-D features of corners to some extent. Experimental results show that the method is valid and the 3-D corner is useful for image matching.

New Exact Solutions and Conservation Laws to （3＋1）-Dimensional Potential-YTSF Equation

Using the modified find some new exact solutions to Lie point symmetry groups and also get conservation laws, of the CK＇s direct method, we build the relationship between new solutions and old ones and the （3＋1）-dimensional potentiaial-YTSF equation. Baaed on the invariant group theory, Lie symmetries of the （3＋1）-dimensional potential-YTSF equation are obtained. We equation with the given Lie symmetry.

Symmetry Reduction, Exact Solutions, and Conservation Laws of （2＋1）-Dimensional Burgers Korteweg-de Vries Equation

Using the classical Lie method of infinitesimals, we first obtain the symmetry of the （2＋1）-dimensional Burgers-Korteweg-de-Vries （3D-BKdV） equation. Then we reduce the 3D-BKdV equation using the symmetry and give some exact solutions of the 3D-BKdV equation. When using the direct method, we restrict a condition and get a relationship between the new solutions and the old ones. Given a solution of the 3D-BKdV equation, we can get a new one from the relationship. The relationship between the symmetry obtained by using the classical Lie method and that obtained by using the direct method is also mentioned. At last, we give the conservation laws of the 3D-BKdV equation.

Seeing Rape as Rape： Philosophical and Historical Perspectives on Marriage Law

In this paper, I critically challenge the ability of legal reforms to recognize and integrate the way in which a rape victim sees rape. Current limitations to the law are mainly due to the accepted patriarchal view on law as a form of objective and rational knowledge, outside which there are only impracticable and irrational views. I investigate the case of marriage jurisprudence in the UK, as a prominent example, because it has long accepted marital rape as objectively and rationally part of a wife＇s duty. Even though changes have occurred which improve the marital rape jurisdiction and prejudicial disbelief concerning a woman＇s private life is still used in the courts to question the credibility of the victim. Over the past year, extensive efforts have been made to reform the management of rape cases. Whilst there is a need to acknowledge the seriousness of the accusation with rigorous legal principles which provide appropriate safeguards for the accused person as well as the complainant, especially bearing in mind the often ＂private＂ circumstances, with a concomitant lack of witnesses, it remains the case that the rate of attribution in attempts to secure successful prosecutions in rape case remains overwhelming. I show how a Wittgensteinian approach to law would take into consideration the shape ofgendered lives as they are experienced, and hence would not accept just one legal interpretation of marital law. The phenomenon of＂seeing-as＂ in Wittgenstein＇s philosophy can support the experience of being jolted into appreciating the feminist aspect of consent in marital sexual relationships.

Influences of nonassociated flow rules on three-dimensional seismic stability of loaded slopes

The influences of soil dilatancy angle on three-dimensional （3D） seismic stability of locally-loaded slopes in nonassociated flow rule materials were investigated using a new rotational collapse mechanism and quasi-static coefficient concept. Extended Bishop method and Boussinesq theorem were employed to establish the stress distribution along the rupture surfaces that are required to obtain the rate of internal energy dissipation for the nonassociated flow rule materials in rotational collapse mechanisms. Good agreement was observed by comparing the current results with those obtained using the translational or rotational mechanisms and numerical finite difference method. The results indicate that the seismic stability of slopes reduces by decreasing the dilatancy angle for nonassociated flow rule materials. The amount of the mentioned decrease is more significant in the case of mild slopes in frictional soils. A nearly infinite slope under local loading, whether its critical failure surface is 2D or 3D, not only depends on the magnitude of the external load, but also depends on the dilataney angle of soil and the coefficient of seismic load.

New double yield surface model for coarse granular materials incorporating nonlinear unified failure criterion

A new double-yield-sarface （DYS） model was developed to characterize the strength and deformation behaviors of coarse granular materials （CGMs）. Two kinds of deformation mechanisms, including the shear and compressive plastic deformation, were taken into account in this model, These two deformation mechanisms were described by the shear and compressive yield functions, respectively. The Lode angle dependent formulations of proposed model were deduced by incorporating a 3D nonlinear unified failure criterion. Some comparisons were presented between the numerical predictions of proposed model and test data of true triaxial tests on the modeled rockfills. The model predictions are in good agreement with the test data and capture the strain hardening and plastic volumetric dilation of CGMs. These findings verify the reasonability of current DYS model, and indicate that this model is well suited to reproduce the stress-strain-volume change behavior of CGMs in general.

On Differential Equations Describing 3-Dimensional Hyperbolic Spaces

In this paper, we introduce the notion of a （2＋1）-dimenslonal differential equation describing three-dimensional hyperbolic spaces （3-h.s.）. The （2＋1）-dimensional coupled nonlinear Schrodinger equation and its sister equation, the （2＋1）-dimensional coupled derivative nonlinear Schrodinger equation, are shown to describe 3-h.s, The （2 ＋ 1 ）-dimensional generalized HF model：St=（1/2i[S,Sy]＋2iσS）x,σx=-1/4i tr（SSxSy）, in which S ∈ GLc（2）/GLc（1）×GLc（1）,provides another example of （2＋1）-dimensional differential equations describing 3-h.s. As a direct con-sequence, the geometric construction of an infinire number of conservation lairs of such equations is illustrated. Furthermore we display a new infinite number of conservation lairs of the （2＋1）-dimensional nonlinear Schrodinger equation and the （2＋1）-dimensional derivative nonlinear Schrodinger equation by a geometric way.

Analytical Algorithms for the Blend Ratios by Fibre-bundle Tensile Curves Part I: Typical Tensile Curve and the Strength and Work Methods

The blend ratio and tensile properties are vital important characteristics of blended fibre bundles. Fibre-bundle tensile behaviour has been measured by means of the Sirolan-Tensor in order to derive a typical specific stress — extension curve. According to the typical tensile curve, the relationships between the blend ratio and the tensile parameters are discussed and established. Two new algorithms, so-called the strength method and the work method, have been developed for the blend-ratio estimation of blended fibre bundles. The relevant blend-ratios and calculations of the two methods are defined in detail. Also, the characteristics have been explained for every calculation and compared to each others. The experimental results show that the blend ratios estimated from the theoretical methods are high coincidence with the measured results. Meanwhile, the specific stress — extension curve of blended fibre bundles depends directly on the blend ratios of the fibre bundles.

A modeling method for virtual scene based on multi-view image sequence

Through the analysis and comparison of shortcomings and advantages of existing technologies on object modeling in 3D applications,we propose a new modeling method for virtual scene based on multi-view image sequence to model irregular objects efficiently in 3D application.In 3D scene,this method can get better visual effect by tracking the viewer's real-time perspective position and projecting the photos from different perspectives dynamically.The philosophy of design,the steps of development and some other relevant topics are discussed in details,and the validity of the algorithm is analyzed.The results demonstrate that this method represents more superiority on simulating irregular objects by applying it to the modeling of virtual museum.

Use of Lightweight 3d Wire Panels to Construct Low Rise Structures in Seismic Areas： Some Applications and Design Rules

In high seismic regions of the world, including Turkey, there are too many low-rise residential buildings made of rigid masonry walls or flexible moment-resistant frames with brittle masonry partitioning walls. During even moderate earthquakes, these buildings suffer heavy damages and brittle failures causing hundreds if not thousands of people to lose their lives and homes. Hence it is essential to build a house with lightweight materials that have an earthquake resistance with a proper safety. Recently in some countries such as USA, Italy, China and Turkey; a new building system called 3D wire panel building system use prefabricated lightweight panels to construct low-rise buildings up to three stories. The panels are fabricated from polystyrene, steel, and shotcrete concrete .The lightweight of these panels, easy handling, high construction speed, good heat insulation properties, in addition to their low cost by avoiding formwork and need for skilled workers make it an acceptable construction practice. In the literature, there is no enough information on the design rules of this new building system .This paper presents some hits on the design rules and some applications in Turkey such as construction of a factory, construction of a three story villa and construction of mosque domes.

Multi-dimensional evaluation method in music creation and performance of comedy

Multidimensional Scale Evaluation Rules as a performer in the field of learning assessment is feasible, but for each dimension settings, level settings and value setting need to be developed according to the actual raters, object evaluation, the focus of the evaluation. Scores of overall dimensions use variance analysis, and the results show a significant difference. In sub-dimension score comparison, the high group and low group both got higher scores in the degree of difficulty performing works and read music accuracy. The high group and low group are different on dimensions of the lowest score. Total scores in the scale of multi-dimensional evaluation of rules are positively correlated on the scores on the improvising horizontal dimension, but the correlation is not very high level, that is not all students who is better in playing levels, and they can get higher scores on the improvising horizontal dimension. Using multi-dimensional scale scores and teacher direct evaluation rules score are significantly different for student achievement.

3D structure parameterization design and modeling for irregular structure of stope bottom

Stope mining design is a very important and complicated task in daily production design and technical management of an underground mine.Based on workface technology and human-computer interaction technology,this study introduces a method of 3D parametric design for the irregular structure of stope bottoms,and focuses on solving technical problems in surface modeling of stope bottom structure.Optimization of the minimum span length algorithm(MSLA) and the shortest path search algorithm(SPSA) is conducted to solve the problem of contour-line based instant modeling of stope bottom structures,which makes possible the 3D parametric design for irregular structure of stope bottom.Implementation process and relevant methods of the proposed algorithms are also presented.Feasibility and reliability of the proposed modeling method are testified in a case study.In practice,the proposed 3 D parameterization design method for irregular structure stope bottom proves to be very helpful to precise 3D parametric design.This method is capable of contributing to improved efficiency and precision of stope design,and is worthy of promotion.

Bringing Systematic Thinking of Landscape Justice Into Global Design Practice

Design increasingly plays a pivotal role in achieving justice for all.However,there are often gaps between visions and implementation due to the variety of factors and stakeholders involved in design practice.Through literature review and a keyword co-occurrence analysis,this paper investigates current landscape justice research and identifies the distinguishing concerns in design,and highlights the importance of systematic thinking in achieving landscape justice.By examining the practices of the British company Building Design Partnership(BDP),a multinational design company,this paper identifies BDP’s three key design principles as experiences can be followed for landscape justice:design for inclusion,design for resilience,and design for future ecosystems.The paper also addresses potential challenges and conflicts in implementing landscape justice across different contexts and highlights multinational design companies’efforts to mediate between various stakeholders.Finally,this paper demonstrates that design companies can contribute to 1)bridging social and environmental justice through landscape design,2)achieving the visions promoted by scholars,3)identifying and deploying diverse approaches to achieving landscape justice with their sensitivity to practical problems,and 4)fostering integrated feedback loops via both top-down and bottom-up approaches to ensure effective implementation of landscape justice.

西安碑林

本期封底刊登的图片是西安碑林的外景。碑林是全国第一批重点文物保护单位,位于今陕西省西安市三学街。它初建于北宋元祜五年(公元1090年),开始主要是为了保存唐朝开成年间镌刻的《二十三经》碑石,后来历代各种石碑陆续运至此地,数量不断增加,现已有六个陈列室、六个游廊和一个碑亭,共展出碑石墓志一千多块,成为举世闻名的石碑集中地。

以色列政局风云变幻

耶路撒冷专电 以色列副总理兼外长利维3月30日突然宣布辞职,使以朝野震惊。但到4月7日,他又宣布继续留任,使不少人感到意外。 以色列人都知道,利维心高气盛,雄心勃勃,觊觎总理宝座有年。当初他宣布辞职,多数人不相信是出乎真心。总理沙米尔说他在“开玩笑”,还有阁员称之为“政治讹诈”。而利维则说他“一天也不想多干”,将向4月5日内阁例会提出正式辞呈,并“