“初生New独（A New Breed）”

一个属于中国年轻人自己的摄影展。所有的照片由 Lasalle设计学院的学生提供,它们将新一代聪慧,快速成长的城市青年的形象生动地展现了在我们面前。展会由TBWA＼CHINA广告公司设计主办,TBWA是一家目前在国内与众多处于领导地位的拥有年轻消费群的品牌合作的广告公司,例如:Adidas,Apple,和Chivas Regal．TBWA是 Media杂志评选出的区域性05年度最佳广告公司。     

Magnetically Induced Potential Noise (MIPN)—A New Method for the Characterization of Magnetic Materials and for New Sensor Applications

Abstract

This paper discusses a new methodology for characterizing the magnetic properties of ferromagnetic materials. The method uses an alternating electric current to periodically magnetize ferromagnetic materials. The periodic magnetization generates a high-frequency electric potential noise between two electrodes within the excitation circuit. The magnetically induced electric potential noise (MIPN) is related to the discontinuous processes that occur during magnetization similar to magnetic Barkhausen noise. This paper discusses the results of several experiments that measured both electric potential noise and Barkhausen noise signal. A comparison of the results showed that the MIPN correlates directly to magnetic Barkhausen noise. The MIPN signal is small when compared to Barkhausen noise, but it is still easy to measure under laboratory conditions. Therefore, MIPN could be an efficient technique for materials characterization and sensor technology, for example, as fiber stress sensors in a composite aircraft component.     

An Algorithm for the Construction of “D-Optimal” Experimental Designs

This paper presenm the algorithm “DETMAX” whose purpose is to construct experimental designs that are “D-optimal.” These are designs for which the determinant of X'X is maximum, where X is the “matrix of independent variables” in the usual linear model y = Xβ + ε. Although the algorithm does not guarantee D-optimality, it has performed well in many cases where D-optimal designs are known. Five examples are given, illustrating the use of DETMAX to construct designs “from scratch” and to augment existing data. A FORTRAN listing is available on request.     

Residual stresses in thermoplastic composites—A study of the literature—Part II: Experimental techniques

This study forms part of a literature survey on residual stresses in continuous fibre reinforced thermoplastic composites. After identification of the factors responsible for the thermal residual stress build-up in Part I [Parlevliet PP, Bersee HEN, Beukers A. Residual stresses in thermoplastic composites – A study of the literature – Part I: Formation of residual stresses. Composites Part A – Appl Sci Manuf, in press, doi:10.1016/j.compositesa.2005.12.025], experimental techniques to determine the magnitude and distribution of these stresses on various mechanical levels are outlined. The techniques are placed in the following categories: techniques utilising the intrinsic composite constituents’ material properties; techniques employing embedded “foreign” stress sensors; techniques based on in-plane and out-of-plane deformations, and destructive techniques.     

A “gel” model for coal

Coal is a sedimentary, organic rock which is almost never in a state of thermal equilibrium. Because of its importance, the thermal properties of this ill-characterized substance are of great interest. Recent work has shown that coal has many of the characteristics of a gel-type structure. We have made this observation the basis for a model study of the thermal properties of a gel system, using the equation-of-motion method to determine the density of states for the system and, thereby, its heat capacity. This model has one of the essential features of a model of coal, namely, a porous structure. With a hexagonal close-packed lattice as the basis for our gel, we have calculated the frequency spectrum for several particle densities. The disorder in the system has a marked effect on the frequency spectrum, shifting a larger number of modes from high to low frequencies. Also, for a gel with 3% vacancies, and in-plane, out-of-plane bond strengths at the ratio 2 1, there is a further shift to lower frequencies and the two-peaked spectrum expected for such an anisotropic structure develops. The heat capacity is affected only at low temperatures. We conclude that the gel model provides a satisfactory basis for development as a model of coal.Paper presented at the Ninth Symposium on Thermophysical Properties, June 24–27, 1985, Boulder, Colorado, U.S.A.     

Erratum to: “A microfluidic chip with hydrodynamic traps for in vitro microscopic investigations of single cells”

Technical Physics Letters -     

New method for obtaining “green” encapsulated fertilizers with nanoporous structure within the concept of sustainable development

Clean Technologies and Environmental Policy - Creating “green” organo-mineral fertilizers with a porous structure requires a systematic approach to the development of granules...     

Concentration and Separation of Actinides in Nitric Acid Media with Fibrous “Filled” Sorbents

The behavior of actinides in sorption from nitric acid solutions with fibrous filled sorbents was studied. It was found that the sorbents with methylpyrazole groups POLIORGS 4-n and 17-n and anion exchanger AV-17-n sorb completely only Pu(IV) from strongly acidic solutions. The other actinides studied [Am(III), U(VI), Pa(V), Np(V)], and also Eu(III), Tc(VII), and Cs(I) are not appreciably sorbed under these conditions. The sorbents are characterized by good kinetic properties and chemical stability in HNO₃ solutions. The possibility of using fibrous "filled" sorbents for concentrating plutonium from nitric acid solutions and separating plutonium from other radionuclides was demonstrated. Pu can be desorbed with 0.5-1 M HNO₃.     

Increasing the Entrapment of Protein-Loaded Liposomes with a Modified Freeze–Thaw Technique: A Preliminary Experimental Study

The objective of this study was to investigate the possibility of increasing the entrapment of protein-loaded liposomes with a modified freeze–thaw technique. Blank liposomes were prepared by ethanol injection method. Then recombinant human growth hormone (rhGH) was added to blank liposome suspension. rhGH encapsulation efficiency was enhanced by modified freeze–thaw technique. We separated each step and studied the effect of each parameter on encapsulation: incubation temperature (water bath from 0 to 15°C), incubation duration (from 5 to 90 min), number of freeze–thaw (from 0 to 4 cycle), and the ratio between rhGH and phospholipids (from 1:5 to 1:10). The effect of cryoprotectants on the encapsulation and particle size distribution was finally examined. rhGH encapsulation efficiency was determined by Bradford's dye-binding assay. Morphology and size distribution of rhGH liposomes were also observed. The optimum parameters for rhGH encapsulation were incubation temperature of 5°C, incubation duration of 40 min, and three to four cycles of freeze–thaw. The ratio between rhGH and phospholipids did not affect the encapsulation percentage. Trehalose exhibited the highest integrated value among the cryoprotectants investigated. From the results, this study demonstrates the suitability of the modified freeze–thaw technique for obtaining rhGH liposomes with high entrapment.