基于四次方程的三角解研究非球对称动态黑洞的"类视界面"

给出了具有实用价值的四方程的三角解正根公式，并以匀加速直线运动的Kerr黑洞为例，成功的研究了非球对称动态黑洞的“类视界面”。     

Textures and Exotic Vortices in Neutral Fermion Superfluids

There has been intense interest in various Fermion superfluids in neutral atom liquids and gases, including chiral p-wave pairing in ³He-A phase and Feshbach-resonanced ⁶Li atom gases and d-wave pairing in atom gases. It is particularly interesting to find exotic vortices and associated low-lying Fermionic excitations under rotation. Here we report on our efforts of those topics: (1) Majorana Fermion in chiral superfluids near a p-wave Feshbach resonance. (2) Possible half-quantum vortices in p-wave superfluids of trapped Fermion atom gases. (3) Stability of a half-quantum vortex in rotating superfluid ³He-A between parallel plates. (4) Majorana bound state in rotating superfluid ³He-A between parallel plates. (5) Non-Abelian Fractional vortex in d-wave Feshbach resonance superfluids. We will summarize some of those works in a coherent manner in order to bridge the understanding between cold atom community and superfluid ³He community by stressing the importance of cross fertilization between them.     

Theories of Linear Response in BCS Superfluids and How They Meet Fundamental Constraints

We address the importance of symmetry and symmetry breaking on linear response theories of fermionic BCS superfluids. The linear response theory of a noninteracting Fermi gas is reviewed and several consistency constraints are verified. The challenge to formulate linear response theories of BCS superfluids consistent with density and spin conservation laws comes from the presence of a broken U(1)_EM symmetry associated with electromagnetism (EM) and we discuss two routes for circumventing this. The first route follows Nambu’s integral-equation approach for the EM vertex function, but this method is not specific for BCS superfluids. We focus on the second route based on a consistent-fluctuation-of-the order-parameter (CFOP) approach where the gauge transformation and the fluctuations of the order parameter are treated on equal footing. The CFOP approach allows one to explicitly verify several important constraints: The EM vertex satisfies not only a Ward identity which guarantees charge conservation but also a Q-limit Ward identity associated with the compressibility sum rule. In contrast, the spin degrees of freedom associated with another U(1) _z symmetry are not affected by the Cooper-pair condensation that breaks only the U(1)_EM symmetry. As a consequence the collective modes from the fluctuations of the order parameter only couple to the density response function but decouple from the spin response function, which reflects the different fates of the two U(1) symmetries in the superfluid phase. Our formulation lays the ground work for applications to more general theories of BCS-Bose Einstein Condensation (BEC) crossover both above and below T _c .     

Faults in the testing and use of gravitational test working hypotheses

An example is given when Le Sage’s working hypothesis on gravity due to a misunderstanding was erroneously repudiated by Q. Majorana. Another example is given for the case of incorrect usage of this working hypothesis that led to erroneous denial of the unique experimental results of Majorana. __________ Translated from Izmeritel’naya Tekhnika, No. 4, pp. 7–12, April, 2006.     

Optimal bounded control of harmonically and stochastically excited strongly nonlinear oscillators

A procedure for designing optimal bounded control to minimize the response of harmonically and stochastically excited strongly nonlinear oscillators is proposed. First, the stochastic averaging method for controlled strongly nonlinear oscillators under combined harmonic and white noise excitations using generalized harmonic functions is introduced. Then, the dynamical programming equation for the control problem of minimizing response of the systems is formulated from the partially completed averaged Itô equations by using the dynamical programming principle. The optimal control law is derived from the dynamical programming equation and control constraint without solving the dynamical programming equation. Finally, the stationary probability density of the amplitude and mean amplitude of the optimally controlled systems are obtained from solving the reduced Fokker–Planck–Kolmogorov equation associated with fully completed averaged Itô equations. An example is given to illustrate the proposed procedure and the results obtained are verified by using those from digital simulation.     

采用峰值荷载法确定全级配水工混凝土断裂参数

该文采用峰值荷载法研究了全级配水工混凝土试件的断裂参数。通过有限元方法,得到了适用于全级配水工混凝土的非标准楔入劈拉试件的应力强度因子K、裂缝嘴张开口位移CMOD计算公式以及裂缝张开位移COD与CMOD比值COD/CMOD的相关曲线。基于相关断裂试验,通过该文所提公式得到了全级配水工混凝土的等效断裂韧度与临界裂缝尖端张开口位移CTOD_c等断裂参数。研究结果表明：峰值荷载法可应用于截面尺寸不同而缝高比相同的全级配水工混凝土试件,峰值荷载法只需实测各试件的峰值荷载,就可方便确定全级配水工混凝土的断裂参数。     

Determining volumetric properties and permeability of asphalt-treated permeable base mixtures

The volumetric properties of drainage layer mixtures are important parameters to pavement design but hard to determine due to large air void contents. The currently available methods including Dimensional method, Parafilm method and vacuum sealing method to determine the specific gravity and consequently the air void content of the asphalt-treated permeable base (ATPB) mixture have been compared, and the most feasible test method to determine the air void content of the ATPB specimens has been recommended. It is found that significant difference exists among these methods as the air void content increases. The ANOVA suggests that for specimens of 24% or larger air void contents the vacuum sealing method should be chosen for better results. The permeability of two typically used drainage layer mixtures of Virginia and Oklahoma was also determined in the laboratory and correlated with volumetric characteristics.     

重力坝动力特性测试方法模型试验研究

目前水工结构的动力破坏特性越来越受到关注,其中动力特性是其研究的一个重要方面。通过模型试验的方法研究重力坝模型动力特性的测试方法。重点研究了环境激励法测试结构动力特性的效果,并与传统测力法进行了比较。试验结果表明采用环境激励的方法,可只根据结构的振动响应数据,有效地测试结构的动力特性。并且在不同大小环境激励下结构的振型没有发生变化,频率与阻尼比变化很小。试验结果还表明通过环境激励法与通过传统激励法测试的振型、频率与阻尼比相差很小,可认为采用这两种方法测试的结构动力特性一致。同时还说明环境激励法可有效地测试有损伤结构的动力特性。试验结果为使用环境激励法测试实际在线重力坝结构的动力特性提供了依据。     

极限荷载的突变模型研究

结构的极限荷载是研究结构整体失效破坏和安全度的重要内容,该文以混凝土重力坝为对象,采用突变理论来研究混凝土重力坝的极限荷载,探讨重力坝沿建基面破坏时不同突变模型对极限荷载的影响。假定重力坝坝体和地基为刚性体,建基面存在一薄弱结合面,以建基面水平方向的位移为状态变量,施加的上游水压力为控制变量,分别建立反映此模型沿建基面...     

New Horizons for Diagnostics and Therapeutic Applications of Graphene and Graphene Oxide

Graphene, a one‐atom‐thick two‐dimensional (2D) layer of sp²‐bonded carbon, has received worldwide attention owing to its extraordinary physical and chemical properties. Recently, great efforts have been devoted to explore potential applications of graphene and its oxide in life science, especially in disease‐related diagnostics, near‐Infrared (NIR) phototherapy and imaging. Here we will introduce recent advances and new horizons in this area, and focus on the rising progress on NIR photothermal therapy for cancer and Alzheimer's disease (AD), human telomerase detection, stem cell proliferation and differentiation on graphene substrate, diagnosis of cancer cell and related biomarkers, drug/nucleotide/peptide delivery and cell imaging, which have not been comprehensively reviewed. We hope to provide an outlook to the applications of graphene and its oxide, especially on the new horizons in this field, and inspire broader interests across various disciplines.     

露天矿逐孔爆破技术的应用及效果

文章介绍了逐孔起爆技术在部分矿山实际应用的炮孔布置网络和爆破技术效果分析,提出今后需积极探索高精度导爆管雷管孔间延时与孔间应力波幅值叠加原理更好的统一与规范,以推动爆破技术的进步。     

立井深孔直眼掏槽大直径中心空孔作用分析和参数计算

为提高立井基岩段掘进爆破效率,改善破碎块度,采用理论分析和数值模拟相结合的方法,探讨深孔直眼掏槽大直径中心空孔的作用机理。理论研究表明:空孔为装药掏槽炮孔提供了一个与其相平行的辅助自由面和破碎岩石的补偿空间,加大了爆炸应力波的反射拉伸作用,空孔的存在造成了槽腔岩石中的拉应力集中,从而增大了岩石中的拉应力作用强度,引起槽腔中裂隙的进一步扩展延伸,使槽腔内岩石的破裂和破碎更充分。数值模拟结果进一步验证了大直径中心空孔所具有的应力叠加和反射拉伸作用。在此基础上,对空孔与装药孔间距的合理取值进行了理论分析计算,中心空孔应处在掏槽孔形成的爆破裂隙区之内,并选用较大的松动爆破作用指数进行设计。     

NURBS machining and feed rate adjustment for high-speed cutting of complex sculptured surfaces

Owing to the enormous engineering advancement in modern industry, the competition in the development of advanced manufacturing technologies has been increasingly intense as can be seen in automobile, aerospace and various industries. Not only has product quality improved tremendously, but also the demand over production speed has become higher. Therefore, high-speed and high-accuracy production has become a very important goal of modern manufacturing companies. Thanks to ever increasing computer speed and the open architecture of new controllers in computer-controlled machines, the capability and flexibility of today's CNC machines allow us to machine contoured geometry using non-uniform rational B-spline (NURBS) curves directly from the free-form surfaces of a complex CAD/CAM model. As a result, machining accuracy and product quality can be greatly improved while machining time is also significantly reduced. This paper proposes a post-processing approach to convert G1 NC codes from most CAD/CAM systems to NURBS NC paths for highspeed contour machining. The NURBS interpolation strategy that takes into account the optimized cutting feed rate based on machine dynamic response and curvature of the NURBS curve is also developed. Experiments show that the implemented NURBS cutting can significantly improve machining accuracy and reduce cutting time and therefore satisfies the requirements of today's highspeed and-accuracy machining needs.     

大直径浅孔在控制爆破中的应用

在核电南路的施工中,用大直径钻机实施钻爆。采用有效措施,对震动和飞石进行了控制,成功地完成了大孔在浅孔控制爆破中的应用。     

Rolling horizon planning in supply chains: review,implications and directions for future research

Due to their complexity and extensive application in industry, rolling horizon planning systems have received considerable attention in the literature. Of particular interest is the impact of different lot-sizing rules and policy variables on replenishment schedule cost and stability. Past research indicates that exact lot-sizing approaches may not perform the best in rolling horizon environments and that a single algorithm seldom performs well on both schedule cost and stability. In addition, a rolling horizon policy that performs well in one operating environment may perform poorly under different conditions. While rolling horizon research typically assumes a single planner, or planning layer, recent trends in outsourcing and global operations call for the study of supply chains that are characterised by multiple planning layers with information sharing and coordination among them. This article reviews the rolling horizon planning literature and synthesises the findings, extends the research taxonomy to include emerging research on supply chain systems with multiple planning layers and joint inventory replenishment, and provides several promising future research directions. This survey provides a starting point for anyone conducting research in this important research area.     

Discounting risks in the far future

Risks to life and health in the future must be discounted in quantitative risk analysis. Yet, risks in the distant future become trivialized if any reasonable constant interest rate is used. Our responsibility toward future generations rules out such drastic discounting. A solution to this problem is proposed here, resting on the ethical principle that our duty with respect to saving lives is the same to all generations, whether in the near or far future. It is shown that when a choice between prospects involving different risks has a financing horizon T, then ordinary principles of discounting apply up to this time T, while no further discounting is justifiable after T. The principle implies that risk events beyond the financing horizon should be valued as if they occurred at the financing horizon.     

预裂孔逐孔起爆在露天矿破碎带边坡的应用

攀枝花铁矿进入中深部开采后,露天采场的边坡高度已达105~555m。随着边坡高度的增加,高陡边坡的局部沉降、垮塌频发,严重威胁采场内人员和设备的安全。针对露天采场的不稳定边坡主要集中在破碎带部位,破碎带的爆破预裂效果较差并且有爆破产生的振动等问题,根据预裂爆破成缝机理,结合破碎带边坡地质特征和延时爆破理论,对破碎带预裂效果较差的原因进行了分析。认为预裂孔逐孔起爆更有利于破碎带边坡的预裂效果,同时能够"引导"、减轻爆生气体向预留边坡方向的作用,还能降低爆破振动对预留边坡的破坏作用。通过预裂孔同时起爆和逐孔起爆在破碎带部位的对比实验,取得了预裂孔逐孔起爆在孔痕率和爆破减振率上优于预裂孔同时起爆的实验效果。     

平衡锁定元件在高液压回路中的应用与探讨

本文结合工程实际问题，就油缸承重下降问题在高液压回路中系统压力变化机理、元件选择及参数应用等方面进行了分析和探讨，并解决了工程中遇到的实际问题。