《边界》:俄侨在中国的知音——以1939年出版的全刊为例

《边界》是俄侨在哈尔滨创办的俄文周刊,存在时间长达18年。杂志图文并茂,内容十分丰富,是一本集文学性、趣味性、实用性三位一体的综合性期刊,是俄侨在中国办刊时间最长、发行量最大、波及面最广、影响力最持久、最受俄侨欢迎的杂志。本文以1939年出版发行的全部期刊为研究对象,全面梳理、分析、研究其内容,客观、真实地展示当时俄侨在中国的生活状况和精神追求。

语言与愤怒——对《边界》主人公克莱尔的女性主义话语分析

苏珊·格拉斯佩尔在《边界》中的女性话语试验展现了其最具先锋性的一面。剧中克莱尔的话语将其女性经验完全暴露在外,一方面成为克莱尔以"他者"姿态对抗父权体系的武器,另一方面又造成自我与他人交际的失败,并最终导致克莱尔的失控与疯癫。以女性主义话语理论分析克莱尔话语的女性特质,以及此种女性话语对克莱尔人际关系与命运的影响。

蓝蓝诗剧《边界》将在雅典演出

首部中国中学生排演的诗剧《边界》将于6月底在希腊雅典上演，这是第一次由中学生表演的诗剧在希腊首都演出。《边界》是中国诗人蓝蓝的作品，由青年实力导演孙晓星执导此剧，演员是来自北京首都师范大学附属育新学校的学生和老师，是中国中学生以戏剧的形式向西方戏剧的发源地希腊的特殊致敬。

《边界》

以北欧神话中坠入深海,环绕世界的尘世之蛇为灵感,融入流体画、彩瓷等元素,选取手镯为载体,表达世界环绕于皓腕。

乡愁的两种表达式——余光中《乡愁》与洛夫《边界望乡》比较

余光中《乡愁》和洛夫《边界望乡》为台湾乡愁诗歌的"双壁"。两位诗人都有着颠沛流离的人生经历,又不约而同走过由"西化"向传统回归的诗歌创作之路,时空阻隔所产生的乡愁为《乡愁》和《边界望乡》共同表现的内容。余光中《乡愁》在一静态的情境中创造完成,所表现出的乡愁情感具有普适性、共通性;诗作结构整齐,节奏静缓,意象朴素明朗,语言体现了一种纯净之美。坚持创造性为诗歌生命,洛夫近乡情怯而作《边界望乡》,抒发的是极具诗人个体性的乡愁体验;诗行参差,结构跌宕,节奏激越,意象新奇,诗歌语言散发出魔性的色彩。

“眺望原乡”解读——以《又见棕榈,又见棕榈》与《边界望乡》为例

於梨华的小说《又见棕榈,又见棕榈》与洛夫的诗歌《边界望乡》中均出现了"眺望原乡"这一经典场景,其中的主人公站在可以远眺大陆原乡却无法跨越的临界点上,时序错置和空间位移是其无法绕开的心灵症结,于是产生了强烈的悖谬感和孤绝感。这种由于历史归属感的缺失而生发的原乡感受自身具备了高度的精神张力,并构成了当代台湾文学中一种特有的沉重话语。

论《边界乡村》中的社会空间政治

本文以家屋、工作场所以及城市与乡村等社会空间为考察对象,分析威廉斯的自传体性质的小说《边界乡村》的社会空间中男性与女性、社会主义和资本主义信仰、殖民主与殖民者之间的对立冲突,进而揭示小说中所呈现的性别、阶级以及民族身份等权力结构和社会关系以及威廉斯对此的探索和思考。

字字看来皆是血——洛夫《边界望乡》解读

洛夫的《边界望乡》是台湾"乡愁文学"中可以和余光中的《乡愁》并驾齐驱的诗歌名作。它忠实地记录了"我"在落马洲边界登高远眺故国山水时产生的情感波澜,淋漓尽致地渲染了对故国可望而不可即的哀痛,寄寓着整整一代人难以割舍的家国情怀。同时诗歌在艺术上积极探索,既有现代诗新颖奇妙的意象美,又有古典诗歌传统的意境美,堪称中国当代诗歌史上"文质兼美"的典范。

Charge-balanced codoping enables exceeding doping limit and ultralow thermal conductivity

Materials with low thermal conductivity are applied extensively in energy management,and breaking the amorphous limits of thermal conductivity to solids has attracted widespread attention from scientists.Doping is a common strategy for achieving low thermal conductivity that can offer abundant scattering centers in which heavier dopants always result in lower phonon group velocities and lower thermal conductivities.However,the amount of equivalent heavyatom single dopant available is limited.Unfortunately,nonequivalent heavy dopants have finite solubility because of charge imbalance.Here,we propose a charge balance strategy for SnS by substituting Sn2+with Ag^(+)and heavy Bi^(3+),improving the doping limit of Ag from 2%to 3%.Ag and Bi codoping increases the point defect concentration and introduces abundant boundaries simultaneously,scattering the phonons at both the atomic scale and nanoscale.The thermal conductivity of Ag0.03Bi0.03Sn0.94S decreased to 0.535 W·m^(−1)·K^(−1)at room temperature and 0.388 W·m^(−1)·K^(−1)at 275°C,which is below the amorphous limit of 0.450 W·m^(−1)·K^(−1)for SnS.This strategy offers a simple way to enhance the doping limit and achieve ultralow thermal conductivity in solids below the amorphous limit without precise structural modification.

Influence of the boundary effect on the mechanical response test of pavement cushion under the wetting effect of silt

Through a self-developed model test system,the mechanical properties of silt and the deformation characteristics of airport runways were investigated during the period of subgrade wetting.Based on the test results,the reliability of the numerical simulation results was verified.Numerical models with different sizes were established.Under the same cushion parameter and loading width ranges,the effects of the cushion parameters and loading conditions on the mechanical responses of the cushion before and after subgrade wetting were analyzed.The results show that the internal friction angles of silt with different wetting degrees are approximately 34°.The cohesion is from 8 to 44 kPa,and the elastic modulus is from 15 to 34 MPa.Before and after subgrade wetting,the variation rates of the cushion horizontal tensile stresses with the same cushion parameters and loading width ranges are different under the influence of boundary effects.After subgrade wetting,the difference in the variation rates of the cushion horizontal tensile stresses under the same cushion parameter range decreases compared with that before subgrade wetting;however,this difference increases under the same loading width range.Before and after subgrade wetting,the influence of the boundary effect on the mechanical response evaluation of the cushion is not beneficial for optimizing the pavement design parameters.When the cushion thickness is more than 0.25 m,the influence of the boundary effect can be disregarded.

A Computational Framework for Parachute Inflation Based on Immersed Boundary/Finite Element Approach

A computational framework for parachute inflation is developed based on the immersed boundary/finite element approach within the open-source IBAMR library.The fluid motion is solved by Peskin's diffuse-interface immersed boundary(IB)method,which is attractive for simulating moving-boundary flows with large deformations.The adaptive mesh refinement technique is employed to reduce the computational cost while retain the desired resolution.The dynamic response of the parachute is solved with the finite element approach.The canopy and cables of the parachute system are modeled with the hyperelastic material.A tether force is introduced to impose rigidity constraints for the parachute system.The accuracy and reliability of the present framework is validated by simulating inflation of a constrained square plate.Application of the present framework on several canonical cases further demonstrates its versatility for simulation of parachute inflation.

Oriented Bounding Box Object Detection Model Based on Improved YOLOv8

In the study of oriented bounding boxes(OBB)object detection in high-resolution remote sensing images,the problem of missed and wrong detection of small targets occurs because the targets are too small and have different orientations.Existing OBB object detection for remote sensing images,although making good progress,mainly focuses on directional modeling,while less consideration is given to the size of the object as well as the problem of missed detection.In this study,a method based on improved YOLOv8 was proposed for detecting oriented objects in remote sensing images,which can improve the detection precision of oriented objects in remote sensing images.Firstly,the ResCBAMG module was innovatively designed,which could better extract channel and spatial correlation information.Secondly,the innovative top-down feature fusion layer network structure was proposed in conjunction with the Efficient Channel Attention(ECA)attention module,which helped to capture inter-local cross-channel interaction information appropriately.Finally,we introduced an innovative ResCBAMG module between the different C2f modules and detection heads of the bottom-up feature fusion layer.This innovative structure helped the model to better focus on the target area.The precision and robustness of oriented target detection were also improved.Experimental results on the DOTA-v1.5 dataset showed that the detection Precision,mAP@0.5,and mAP@0.5:0.95 metrics of the improved model are better compared to the original model.This improvement is effective in detecting small targets and complex scenes.

Review on hot spinning for difficult-to-deform lightweight metals

Hot spinning process has attracted significant attention because it can be used to manufacture complex parts, extend the forming limit of materials, decrease forming forces and reduce process chains. In this paper, we review researches on lightweight metals spun at elevated temperatures since they are difficult to deform at room temperature. These metals include light alloys, such as titanium, magnesium and aluminum alloys, and metal composites. Then, the heating methods used in the hot spinning process and the treatment methods employed for the temperature boundary condition in finite element analyses for the process were discussed. Finally, the future development directions for the hot spinning process of lightweight but difficult-to-deform alloys were highlighted.

Variable-coordinate forward modeling of irregular surface based on dual-variable grid

The mapping method is a forward-modeling method that transforms the irregular surface to horizontal by mapping the rectangular grid as curved; moreover, the wave field calculations move from the physical domain to the calculation domain. The mapping method deals with the irregular surface and the low-velocity layer underneath it using a fine grid. For the deeper high-velocity layers, the use of a fine grid causes local oversampling. In addition, when the irregular surface is transformed to horizontal, the flattened interface below the surface is transformed to curved, which produces inaccurate modeling results because of the presence of ladder-like burrs in the simulated seismic wave. Thus, we propose the mapping method based on the dual-variable finite-difference staggered grid. The proposed method uses different size grid spacings in different regions and locally variable time steps to match the size variability of grid spacings. Numerical examples suggest that the proposed method requires less memory storage capacity and improves the computational efficiency compared with forward modeling methods based on the conventional grid.

3D electrical resistivity inversion using prior spatial shape constraints

To minimize the number of solutions in 3D resistivity inversion, an inherent problem in inversion, the amount of data considered have to be large and prior constraints need to be applied. Geological and geophysical data regarding the extent of a geological anomaly are important prior information. We propose the use of shape constraints in 3D electrical resistivity inversion, Three weighted orthogonal vectors （a normal and two tangent vectors） were used to control the resistivity differences at the boundaries of the anomaly. The spatial shape of the anomaly and the constraints on the boundaries of the anomaly are thus established. We incorporated the spatial shape constraints in the objective function of the 3D resistivity inversion and constructed the 3D resistivity inversion equation with spatial shape constraints. Subsequently, we used numerical modeling based on prior spatial shape data to constrain the direction vectors and weights of the 3D resistivity inversion. We established a reasonable range between the direction vectors and weights, and verified the feasibility and effectiveness of using spatial shape prior constraints in reducing excessive structures and the number of solutions. We applied the prior spatially shape-constrained inversion method to locate the aquifer at the Guangzhou subway. The spatial shape constraints were taken from ground penetrating radar data. The inversion results for the location and shape of the aquifer agree well with drilling data, and the number of inversion solutions is significantly reduced.

Studies on phase and group velocities from acoustic logging

It is still argued whether we measure phase or group velocities using acoustic logging tools. In this paper, three kinds of models are used to investigate this problem by theoretical analyses and numerical simulations. First, we use the plane-wave superposition model containing two plane waves with different velocities and able to change the values of phase velocity and group velocity. The numerical results show that whether phase velocity is higher or lower than group velocity, using the slowness-time coherence （STC） method we can only get phase velocities. Second, according to the results of the dispersion analysis and branch-cut integration, in a rigid boundary borehole model the results of dispersion curves and the waveforms of the first-order mode show that the velocities obtained by the STC method are phase velocities while group velocities obtained by arrival time picking. Finally, dipole logging in a slow formation model is investigated using dispersion analysis and real-axis integration. The results of dispersion curves and full wave trains show similar conclusions as the borehole model with rigid boundary conditions.

NUMERICAL MODEL OF WAVE FORCES ON CONTINUOUS CYLINDER STRUCTURES

A numerical model of wave force upon continuous cylinder structures with a large diameter using the boundary element method (BEM) is presented. A numerical model of reflecting wave upon continuous cylinders was established on the basis of linear wave theory.The fundamental solution to the Helmholtz equation within an infinite strip area that explicitly satisfies two infinite parallel boundaries is used together with Radiation condition rather than the solution of an infinite area.According to the proposed theory and method,the computer programs have been composed in Visual C ++ Development Studio.Several examples show that the technique and its program are feasible and efficient.And the wave forces upon continuous cylinders can be decreased by as much as 14%～24% under a ratio of D/L= 0.09～0.19 compared with the square caissons.