A Study of the Jet System of the Recovery Concerning Waste Heat of Steam Condensate

This paper presents a frame figure of the recovery system concerning waste heat of steam     

Tensile properties and fracture reliability of a glass-coated Co-based amorphous microwire

Co_68.15Fe_4.35Si_12.25B_15.25 (at%) amorphous microwires with a smooth surface and a circular cross-section were fabricated by the glass-coated melt spinning method. Their mechanical properties were evaluated through tensile tests of the glass-coated amorphous microwires, and their fracture reliability was estimated using two- and three-parameter Weibull analysis. X-ray diffraction and transmission electron microscopy results showed that these glass-coated Co-based microwires were mostly amorphous. The coated Co-based microwires exhibit a tensile strength of 1145 to 2457 MPa, with a mean value of 1727 MPa and a variance of 445 MPa. Weibull statistical analysis showed that the tensile two-parameter Weibull modulus of the amorphous microwires is 4.16 and the three-parameter Weibull modulus is 1.61 with a threshold value as high as 942 MPa. These results indicate that the fabricated microwires exhibit good tensile properties and fracture reliability, and thus appear to be good candidates for electronics reliability engineering applications.     

A Slip-Line Method for Calculating Extrusion Force of Steel Helmet with Cold Extrusion Moulding

1.TEEPLASTICDEFO~Af1ONOFSTEELELLIPSETHINPLMESteelhelmetwithcoldextrusionmouldingisdesignedaccordingtothestandardGB2428(wherethestandardheadsizeofapadultmanisgiven).Accordingtothestandardheadsizeoftheadultman,theconcaveandconvexmodelofsteelhelmetwithcoldextrusionmouldingisdesigned.Theconvexmodelisatensilemodelwithcomplexparabolashape.Thesteelthinplateedgemustbepressedundertwo-wayhydraulicpress.ThesimplifiedcalculatingmodelisshowninFig.1.Theedgeissimplifiedasfixedellipseboundar…     

Comparison of α particle detectors based on single-crystal diamond films grown in two types of gas atmospheres by microwave plasma-assisted chemical vapor deposition

Chemical vapor deposition(CVD)-grown diamond films have been developed as irradiation-resistant materials to replace or upgrade current detectors for use in extreme radiation environments. However, their sensitivity in practical applications has been inhibited by space charge stability issues caused by defects and impurities in pure diamond crystal materials. In this study, two high-quality CVD-grown single-crystal diamond(SCD) detectors with low content of nitrogen impurities were fabricated and characterized. The intrinsic properties of the SCD samples were characterized using Raman spectroscopy, stereomicroscopy, and X-ray diffraction with the rocking curve mode, cathode luminescence(CL), and infrared and ultraviolet-visible-near infrared spectroscopies. After packaging the detectors, the dark current and energy resolution under α particle irradiation were investigated. Dark currents of less than 5 pA at 100 V were obtained after annealing the electrodes, which is comparable with the optimal value previously reported. The detector that uses a diamond film with higher nitrogen content showed poor energy resolution, whereas the detector with more dislocations showed poor charge collection efficiency(CCE). This demonstrates that the nitrogen content in diamond has a significant effect on the energy resolution of detectors, while the dislocations in diamond largely contribute to the poor CCE of detectors.     

Efficient Synthesis of Optically Active Alcohols

1 Introduction Optically active secondary alcohols are versatile building blocks for synthesis of unnatural biological active compounds and functional materials. Therefore, study on efficient synthesis of optically active alcohols is becoming an important subject in synthetic organic chemistry. Catalytic asymmetric reduction of carbonyl compounds is a practical method to create chiral alcohols. For the past decades, a large number of catalytic methods have been developed to achieve this goal. …     

Optical dating of the Jingshuiwan Paleolithic site of Three Gorges, China

The Three Gorges region is located in the transi- tional zone between the upper and middle reaches of the Yangtze River, known as an important area for studying human origins and cultural developments in China. In the mid 1990s, a large scale Paleolithic …     

Symbols detection for frequency-selective V-BLAST OFDM systems

1.INTRODUCTION TheverticalBellLabslayeredspace time(V BLAST)architecture[1]isonemostpromisingspace timecoding(STC)technique.Theprovisioningca pacityoftheV BLASTarchitecturecanmorenear thetheoreticalupper limitofchannelcapacity[2].Therefore,quiteanumberofresearchersproposedto deploytheV BLASTarchitectureinwirelesslocal loop(WLL)andwirelesslocalareanetwork(WLAN)[3].Conventionally,themultiple inputmultiple out put(MIMO)wirelesschannelsintheV BLASTar chitectureareassumedtobefl…     

Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia

Recent fieldwork has extended the distribution of the Daohugou Bed deposits from the Daohugou Village to its several neighboring areas. The fossil-bearing Daohugou deposits uncomformably overlie complex bedrocks, and comprise three major parts. The red shales in the lower part were misidentified as belonging to the Tuchengzi Formation. Field excavation has indicated that the shales of upper part of the bed are the major fossil-bearing horizon. Due to strong tectonic activities, sediments were often folded with the sequences inverted in the region. Some newly recognized contacts between the Daohugou Bed and the volcanic rocks showed that the ignimbrite of the Tiaojishan Formation （159-164 Ma） underlies the Daohugou deposits, rather than overlying the latter as previously proposed. Thus, the age of the Daohugou deposits should be younger than the age of the ignimbrite, and thus it was incorrect to correlate the Daohugou Bed with the Middle Jurassic Jiulongshan Formation. Although biostratigraphic studies based on conchostracans and insects support a Middle Jurassic-early Late Jurassic age for the Daohugou deposits, vertebrate fossils such as Liaoxitriton, Jeholopterus and feathered maniraptorans show much resemblance to those of the Yixian Formation. In other words, despite the absence of Lycoptera, a typical fish of the Jehol Biota, the Daohugou vertebrate assemblage is closer to that of the Early Cretaceous Jehol Biota than to any other biota. We propose that the Daohugou fossil assemblage probably represents the earliest evolutionary stage of the Jehol Biota based on both vertebrate biostratigraphy and the sedimentological and volcanic features which suggest the Daohugou deposit belongs to the same cycle of volcanism and sedimentation as the Yixian Formation of the Jehol Group.     

Recognition of bacterial glycosphingolipids by natural killer T cells

Natural killer T (NKT) cells constitute a highly conserved T lymphocyte subpopulation that has the potential to regulate many types of immune responses through the rapid secretion of cytokines. NKT cells recognize glycolipids presented by CD1d, a class I-like antigen-presenting molecule. They have an invariant T-cell antigen receptor (TCR) alpha-chain, but whether this invariant TCR recognizes microbial antigens is still controversial. Here we show that most mouse and human NKT cells recognize glycosphingolipids from Sphingomonas, Gram-negative bacteria that do not contain lipopolysaccharide. NKT cells are activated in vivo after exposure to these bacterial antigens or bacteria, and mice that lack NKT cells have a marked defect in the clearance of Sphingomonas from the liver. These data suggest that NKT cells are T lymphocytes that provide an innate-type immune response to certain microorganisms through recognition by their antigen receptor, and that they might be useful in providing protection from bacteria that cannot be detected by pattern recognition receptors such as Toll-like receptor 4.     

Research on Reservoir-induced Earthquake Monitoring of Yangtze Three Gorges Area

1Introduction　TheThreeGorgesProject (TGP)ontheYangtzeRiverisoneofthegrandestwaterconservancyprojectsintheworld .Withadepthof 1 85meters,thereser voircanaccommodatewaterof39.3bil lioncubicmeters.Thepowergenerationcapacityis 1 8 2millionkilowatts.Whencompleted ,theprojectwillsup plyahugeamountofelectricityandhaveafunctionofservingthefloodcon trolpurpose,facilitatingshippingandadjustingthewaterfluxofthetrunksoftheYangtzeRiver.Itwillprovetobeahighlyefficientandcomprehensivehydraulicproject.A…