There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Twin related domain formation is examined as a strain relaxation mechanism for a heteroepitaxial tetragonal film on a cubic substrate. Elastic relaxations are calculated for a single twin band in which the c-axis of the tetragonal domains is either related by a 90° rotation about an axis in the plane of the film or by a 90° rotation about the surface normal. In all cases, the strain energy change is evaluated for both the film and the substrate. A domain pattern map is developed that predicts single domain and multiple domain fields depending on the relative misfit strains and domain wall energy. The concept of a critical thickness, hc, for domain formation is developed. For cases in which the c-axis is rotated 90° about an axis in the plane of the film, the critical thickness depends only on the relative coherency strain between the substrate and film and the ratio of the domain wall energy to the stored elastic energy. For the case of a pattern consisting of energetically equivalent domains with the c-axis in plane, the equilibrium distance of multiple domains is derived. For such multiple domains, a minimum wall separation distance exists which depends non-linearly on the film thickness.

Energy Release Due to Domain Formation in the Strained Epitaxy of Multivariant Films

The invention provides a method to release drugs from a polymer matrix upon demand without degrading the matrix. By applying ultrasound to a self-healable polymer matrix in physiological environment, compounds of both low-molecular and high-molecular weights encapsulated in the matrix are delivered at controlled rates, while the integrity and stiffness of the matrix are unaffected.

On-demand and reversible drug release by external cue

Polycyclic aromatic hydrocarbons in Fildes Peninsula, maritime Antarctica: Effects of human disturbance.

Web 2.0 refers to a collection of second generation web services, such as blogs, social bookmarking, wikis, podcasts, and Really Simple Syndicates (RSS) feeds. While the first generation web (Web 1.0) is about linking information available online, Web 2.0 emphasizes online collaboration and sharing among people. These new web services bring up new opportunities to innovate how we conduct research and education. We report the preliminary explorations of engineering education exploiting Web 2.0 services, through iMechanica (http://imechananica.org ). Hosted at Harvard University and powered by Drupal, an open-source content management system (CMS), iMechanica provides a platform for researchers, educators and students to experiment with innovative ideas on engineering education. For example, instructors can post syllabi, lecture notes, as well as slides and videos on iMechanica. Interested learners can view and study these posts, raise questions and make comments. Quite often an active discussion produces more useful information beyond an original post, and inspires new posts and further discussions. Furthermore, one can subscribe to these discussions through RSS feeds and is notified whenever a new entry is added to the thread of discussion. The instructing and learning through iMechanica are not limited within a specific institution or a specific curriculum. Anyone in the world can join such education processes, as either an instructor or a student, or both. These preliminary explorations of engineering education in the age of Web 2.0 hold the promise to build an online life-long learning environment without boundary.© 2007 ASME

Engineering Education in the Age of Web 2.0: Explorations Through iMechanica.org

Mechanical energy and electrical energy can be converted to each other by using a dielectric elastomer transducer. Large
voltage-induced deformation has been a major challenge in the practical applications. The voltage-induced deformation
of dielectric elastomer is restricted by electromechanical instability (EMI) and electric breakdown. We study the loading
path effect of dielectric elastomer and introduce various methods to achieve giant deformation in dielectric elastomer and
demonstrate the principles of operation in experiments. We use a computational model to analyze the operation of DE
generators and actuators to guide the experiment. In actuator mode, we get three designing parameters to vary the
actuation response of the device, and realize giant deformation with appropriate parameter group. In the generator mode,
energy flows in a device with inhomogeneous deformation is demonstrated.

Zhigang Suo

Papers

Energy Release Due to Domain Formation in the Strained Epitaxy of Multivariant Films

On-demand and reversible drug release by external cue

Polycyclic aromatic hydrocarbons in Fildes Peninsula, maritime Antarctica: Effects of human disturbance.

Engineering Education in the Age of Web 2.0: Explorations Through iMechanica.org

Modeling guided design of dielectric elastomer generators and actuators