Standardization in the Cultural Heritage in China

China has begun its standardization process in the cultural heritage since 1960.The standards contributed a lot to the development of the heritage conservation practices. In this paper, the author summaries the existing condition of standardization in the cultural heritages and museums field in China, and presents Standards for the Classification of Collected Cultural Heritages. Also this paper points out the problems which exist in the standardization in the cultural heritage, and gives the advice to solve these problems.     

Increase or decrease in stability after nucleotomy? Conflicting in vitro and in vivo results in the sheep model

Nucleotomy is a common surgical procedure to treat disc herniations. The potential occurrence of segmental instability after surgery, however, is suspected to necessitate re-operation and fusion. Although in vitro studies support the theory of destabilization after nucleotomy, a prior, in-house animal study contrarily revealed an increase in stability after surgery. To identify which structural compartment of the motion segment is decisive for increased stability after nucleotomy in vivo, the flexibilities of ovine motion segments were measured after different stepwise reductions at the anterior and posterior spinal column. Different test groups were used in which nucleotomy had been performed during surgery in vivo and under isolated in vitro conditions, respectively. In accordance with expectations, in vitro nucleotomy on ovine motion segments significantly increased flexibility. By contrast, nucleotomy significantly decreased flexibility 12 weeks after surgery. After removal of the posterior structures, however, the differences in flexibility diminished. The present results thus suggest that it might not exclusively be the trauma to the intervertebral disc during surgery which is decisive for post-operative stability, but rather adaptive mechanisms in the posterior structures. Therefore, care should be taken to minimize the damage to the posterior structures in the course of the surgical approach, which more likely compromises stability.     

Nonmetal-Metal Transition in Solutions of Metals in Molten Salts

Solutions of metals in molten salts present a rich phenomenology: localisatlon of electrons in disordered ionic media, activated electron transport increasing with metal concentration towards a nonmetal-metal (NM-M) transition, and liquid-liquid phase separation. A brief review of progress in the study of these systems is given in this article, with main focus on the NM-M transition. After recalling the known NM-M behaviour of the component elements in the case of expanded fluid alkali metals and mercury and of solid halogens under pressure, the article focuses on liquid metal-molten salt solutions and traces the different NM-M behaviours of the alkalis in their halides and of metals added to polyvalent metal halides.     

Behaviour of Rare Earths in Solid Solution in Steel

The contents of rare earth metals(REM) insolid solution in 16 Mn steel were determined bymeans of inductive coupling plasma (ICP)spectroscopy.The amount of REM in solid solutionis only a few ppm in the steel with MnS inclusions,which rises slightly with the increasing of REMcontent in steel.At RE/S>1.9,the MnS inclu-sions in steel disappear completely,the REM con-tent in solid solution increases rapidly with the in-creasing of REM content.The solubility of ceriumin 16 Mn steel(st 52)is less than 0.011 wt—％ atroom temperature.The results obtained indicate that REM in sol-id solution reduce the amount of pearlite and in-crease that of ferrite and its microhardness.Dis-solved REM oculd increase temperature of criticalpoints,alleviate band structnre and suppressgrowth of austenite grains.     

Biomaterials affect cell-cell interactions in vitro in tissue engineering

The facts that most tissues or organs consist of a variety of cells suggest that interactions between different types of cells play critical roles in tissue or organ development.In tissue engineering,the effects of biomaterials on cell-cell interactions have recently attracted increasing attention for better elucidating the mechanisms through which biomaterials promote tissue regeneration.Numerous studies have focused on these effects of biomaterials on cell-cell interactions.In this review,comprehensive information was provided about the existing cell co-culture technologies and the main behavioral modes of cell-cell interactions.The effects of biomaterials on the cell-cell interactions in various types of tissue regeneration have been summarized and discussed.In the end,the existing problems and future perspectives that would help promote the research of biomaterials in tissue engineering have been proposed.This article can help researchers to understand the progress and importance of studying the effects of biomaterials on cell-cell interactions in tissue engineering and to choose the optimal cell-cell co-culture models for designing experiments.     

Phuket in Thailand

phuket,来自马来语中的“bukit”,即为小山的意思。那里有布满白色细纱的海岸线,被茂盛的红树林覆盖的东部海岸, 北部蔓延到南部将整个岛屿划分为两部分的小型山脉。在湿润的雨季来临时,直倾下来的瀑布的水流淌入斜坡上的岩石池里,秀丽壮观。 phuket拥有温季、雨季和热季。众所周知温季的phuket可以称为人间天堂,但是Dave没有选择那个美丽的季节,而在这个最让人难以忍耐的热季前往,他是为了得到什么呢?     

Improvement in anodes used in Hall-Héroult cells

 After nearly 100 years of aluminum production with the Hall-Héroult cell, major innovations are being considered, mainly in the materials of construction and the electrodes. This article presents a brief review of some of the innovations made in anode materials. Such improvements lead to better cell efficiencies and environmental benefits; and open the door for improved cell designs hithertofore not possible with available cell materials. Received: 17 November 1998 / Accepted: 19 March 1999     

Tissue differentiation in an in vivo bioreactor: in silico investigations of scaffold stiffness

Scaffold design remains a main challenge in tissue engineering due to the large number of requirements that need to be met in order to create functional tissues in vivo. Computer simulations of tissue differentiation within scaffolds could serve as a powerful tool in elucidating the design requirements for scaffolds in tissue engineering. In this study, a lattice-based model of a 3D porous scaffold construct derived from micro CT and a mechano-biological simulation of a bone chamber experiment were combined to investigate the effect of scaffold stiffness on tissue differentiation inside the chamber. The results indicate that higher scaffold stiffness, holding pore structure constant, enhances bone formation. This study demonstrates that a lattice approach is very suitable for modelling scaffolds in mechano-biological simulations, since it can accurately represent the micro-porous geometries of scaffolds in a 3D environment and reduce computational costs at the same time.     

Mandatory implementation in recycling waste household appliances expected in 2007

China first Administrative Regulations for Waste Household Appliances and Electronic Products Recycling drafted by National Development and Reform Commission is currently under process of examination and approval, which is expected to be officially promulgated for mandatory implementation in early 2007. The drafting version of the Regulations specifies that household electric appliance distributors and after-service institutions have obligation to recycle waste household appliances. Where a distributor or after-service institution doesn't accept manufacture's consignment or refuse to accept waste appliance returned by consumers, or fails to hand over the accepted waste appliances to appropriate manufactures for treatment, the maximal penalty up to RMB100,000 can be applied to above said violations. Promulgation of the Regulation also means the end of the disorder of waste electronics recycling business.     

Thermodynamics of Bainitic Formation in Carbon-depleted Region in Fe-C Alloys

Thermodynamic analysis for the formation of bainitic ferrite in carbon -depleted region has been conducted. The results show that the driving force of bainitic formation increases with depleting of carbon in parent austenite and with decreasing the transformation temperature. The critical driving force (absolute value) at the Bs temperature is 600-1 200 J / mol, which increases as the mean carbon content of Fe-C alloys increases. The freshly-formed bainitic ferrite has partial supersaturation of carbon, which increases smoothly with decreasing the transformation temperature Therefore, the displacive formation of bainitic ferrite in carbon-depleted region is thermodynamically feasible in the whole temperature range of bainitic reaction.     

Sustained-release of Cyclosporin A pellets: preparation,in vitro release,pharmacokinetic studies and in vitro–in vivo correlation in beagle dogs

The aim of this study was to develop Cyclosporin A (CsA) sustained-release pellets which could maintain CsA blood concentration within the therapeutic window throughout dosing interval and to investigate the in vitro–in vivo correlation (IVIVC) in beagle dogs. The CsA sustained-release pellets (CsA pellets) were prepared by a double coating method and characterized in vitro as well as in vivo. Consequently, the CsA pellets obtained were spherical in shape, with a desirable drug loading (7.18?±?0.17?g/100?g), good stability and showed a sustained-release effect. The C_max, T_max and AUC_0–24 of CsA pellets from the in vivo pharmacokinetics evaluation was 268.22?±?15.99?ng/ml, 6?±?0?h and 3205.00?±?149.55?ng·h/ml, respectively. Compared with Neoral®, CsA pellets significantly prolonged the duration of action, reduced the peak blood concentration and could maintain a relatively high concentration level till 24?h. The relative bioavailability of CsA pellets was 125.68?±?5.37% that of Neoral®. Moreover, there was a good correlation between the in vitro dissolution and in vivo absorption of the pellets. In conclusion, CsA pellets which could ensure a constant systemic blood concentration within the therapeutic window for 24?h were prepared successfully. Meanwhile, this formulation possessed a good IVIVC.     

Analyzing fault in pedestrian–motor vehicle crashes in North Carolina

Crashes between pedestrians and motor vehicles are an important traffic safety concern. This paper explores the assignment of fault in such crashes, where observed factors are associated with pedestrian at fault, driver at fault, or both at fault. The analysis is based on police reported crash data for 1997 through 2000 in North Carolina, U.S.A.The results show that pedestrians are found at fault in 59% of the crashes, drivers in 32%, and both are found at fault in 9%. The results indicate drivers need to take greater notice of pedestrians when drivers are turning, merging, and backing up as these are some of the prime factors associated with the driver being found at fault in a crash.Pedestrians must apply greater caution when crossing streets, waiting to cross, and when walking along roads, as these are correlated with pedestrians being found at fault. The results suggest a need for campaigns focused on positively affecting pedestrian street-crossing behavior in combination with added jaywalking enforcement. The results also indicate that campaigns to increase the use of pedestrian visibility improvements at night can have a significant positive impact on traffic safety. Intoxication is a concern and the results show that it is not only driver intoxication that is affecting safety, but also pedestrian intoxication.The findings show in combination with other research in the field, that results from traffic safety studies are not necessarily transferable between distant geographic locations, and that location-specific safety research needs to take place. It is also important to further study the specific effects of the design of the pedestrian environment on safety, e.g. crosswalk spacing, signal timings, etc., which together may affect pedestrian safety and pedestrian behavior.     

A survey of ²²²Rn in drinking water in Mexico City

In Mexico City there are more than 22 millions of inhabitants (10 in the metropolitan area and 12 in the suburban zone) exposed to drinking water. The local epidemiological authorities recognised that exposure to radon contaminated drinking water is a potential health hazard, as has been considered worldwide. The United States Environmental Protection Agency has proposed a limit of 11.1 Bq l(-1) for the radon level in drinking water. In Mexico a maximum contamination level of radon in drinking water has not yet even considered. In this work, a (222)Rn study of drinking water in Mexico City has revealed a range of concentrations from background level to 3.8 Bq l(-1). (222)Rn was calculated using a portable degassing system (AquaKIT) associated with an AlphaGUARD measuring system. Samples from 70 wells of the water system of the south of the Valley Basin of Mexico City and from houses of some other political administrative divisions of Mexico City were taken.     

Error correction in bit‐sliced systems with redundancy in time

Abstract

A new error correction scheme for bit‐sliced arithmetic processors is presented. The method adopted for fault location is an extension of a concurrent error detection scheme named RESO (recomputing with shifted operands). The proposed scheme requires two consecutive computation steps for normal operations and the possible locations of faults, if any, can be located provided that the failures are confined to a certain number of adjacent bit‐slices. We can thus figure out those bit‐slices which are definitely fault‐free. Recomputation is then carried out through these fault‐free bit‐slices and a correct computation can be resulted. A design of the control circuitry as well as the switching mechanism is introduced. The assumption that the failures are confined to a small area of an integrated circuit and the precise nature of the failure is not known makes this scheme very attractive to VLSI circuits.     

搜寻烘焙in大街小巷

北京Beijing啡客站地址:北京市朝阳区定福庄东街2号楼底商2-1单品推荐:鲜果冰激凌松饼、巧克力松饼Maan coffee漫咖啡(酒仙桥店)地址:朝阳区将台西路9-7号(近珀丽酒店)单品推荐:巧克力松饼、芝士松饼蜂蜜蛋糕莫菲蛋糕地址:大兴区亦庄经济开发区科创五街光联工业园1号楼3-4楼单品推荐:德式烤奶酪、提拉米苏、香浓巧克力85度C(新世界青春馆店)地址:东城区崇文门外大街3-5号新世界百货青春馆1楼(地铁崇文门站南)单品推荐:凯撒大帝、照烧小丸子、芝士球     

Stereology in Materials Science

Quantitative analysis of populations having ageometric structure,which has developed into aspecial scientific subject called microstructology orstereology,is of great importance to thecharacterization and evaluation of microstructuresand their evolution in various processes.This paper,besides a brief discussion on those topics such as therecent developments of computer assisted imageanalysis,mathematical morphology,and fractalanalysis,will mainly focus on the scope,fundamen-tals,present status,and perspectives of classicalstereology.Several case examples of its applicationto materials science will also be given.     

The Behaviour of Mg in γ-phase in a Ni-base Superalloy

1.IntroductionSince the biginning of 1960s,the effectof Mg upon superalloy has been studiedand some satisfactory developments havebeen achieved.The role of Mg on the alloycan be summarized as follows:(1)Themechanical plasticity of Ni-base superalloycan be improved by adding Mg asdesulphurizer,because of forming insolubleMgS instead of other low melting eutectic     

Spintronics in Two-Dimensional Materials

Spintronics,exploiting the spin degree of electrons as the information vector,is an attractive field for implementing the beyond Complemetary metal-oxide-semiconductor(CMOS)devices.Recently,two-dimensional(2D)materials have been drawing tremendous attention in spintronics owing to their distinctive spin-dependent properties,such as the ultralong spin relaxation time of graphene and the spin-valley locking of transition metal dichalcogenides.Moreover,the related heterostructures provide an unprecedented probability of combining the di erent characteristics via proximity e ect,which could remedy the limitation of individual 2D materials.Hence,the proximity engineering has been growing extremely fast and has made significant achievements in the spin injection and manipulation.Nevertheless,there are still challenges toward practical application;for example,the mechanism of spin relaxation in 2D materials is unclear,and the high-effciency spin gating is not yet achieved.In this review,we focus on 2D materials and related heterostructures to systematically summarize the progress of the spin injection,transport,manipulation,and application for information storage and processing.We also highlight the current challenges and future perspectives on the studies of spintronic devices based on 2D materials.