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排序方式: 共有93条查询结果,搜索用时 121 毫秒
51.
52.
A. Breakstone R. Campanini H. B. Crawley M. Cuffiani G. M. Dallavalle M. M. Deninno K. Doroba D. Drijard F. Fabbri A. Firestone H. G. Fischer H. Flöge H. Frehse W. Geist L. Geßwein G. Giacomelli R. Gokieli M. S. Gorbics M. Gorski P. Hanke M. Heiden W. Herr L. D. Isenhower E. E. Kluge J. W. Lamsa T. Lohse R. Mankel W. T. Meyer T. Nakada M. Panter A. Putzer K. Rauschnabel B. Rensch F. Rimondi M. Schmelling G. P. Siroli R. Sosnowski M. Szczekowski O. Ullaland D. Wegener R. Yeung ABCDHW Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,40(1):41-47
Proton-proton interactions which result in a central cluster of massM x and two quasi-elastically scattered protons are generally described by Pomeron-Pomeron scattering. A study of this process at ISR energies with the Split Field Magnet detector is carried out in terms of transverse momentum behaviour for the centrally produced system of particles. The inclusivep T distribution for central hadrons is measured up to 3 GeV/c. Forp T <1.2 GeV/c, thep T distribution is exponential. Using a subsample of exclusive events, this exponential shape is shown to originate from a phase-space-like decay ofM x when convoluted with a transverse component of the pomeron momentum. In the highp T range, the shape of thep T distribution strongly depends on Feynman-x of the scattered protons in a way that can be described by hard parton scattering. 相似文献
53.
A study of the (3He, 7Be) reaction has been undertaken using a 70 MeV 3He beam. By surveying a wide range of target nuclides, namely 12, 13C, 16O, 24, 26Mg, 40, 42, 44Ca, 58, 60, 62, 64Ni, 90Zr, 120, 124Sn, 144Sm and 206Pb, systematics of the α-clustering phenomenon were investigated. In addition, masses and energy levels of 60Fe and 120Cd were measured. The 7Be particles were detected in a single wire proportional counter backed by a plastic scintillator in the focal plane of an Enge spectrometer to ensure adequate particle identification. Total energy resolution as small as 140 keV full width at half maximum was obtained, although in most cases the target thickness limited the energy resolution to larger values. Differential cross sections as low as 20 nb/sr were measured. The finite range programs LOLA and LOLITA were used to calculate differential cross sections for comparison to data, assuming the reaction to proceed by a direct α-transfer. The spectroscopic factors which were extracted show a marked decrease with increasing atomic mass number, implying a decrease in surface α-clustering for heavier nuclei. 相似文献
54.
B.Y. Oh W. Morris D.L. Parker G.A. Smith J. Whitmore R.J. Miller J.J. Phelan P.F. Schultz L. Voyvodic R. Walker R. Yaari E.W. Anderson H.B. Crawley W.J. Kernan F. Ogino R.G. Glasser D.G. Hill G. McClellan F. Svrcek 《Physics letters. [Part B]》1975,56(4):400-404
Significant positive correlations are seen for all charge combinations of pion pairs with small rapidity separation. Joint rapidity-azimuthal correlations show that this positive correlation occurs when like (unlike) pions are produced with small (large) separation in azimuth. 相似文献
55.
56.
B.Y. Oh M. Pratap G. Sionakides G.A. Smith J. Whitmore R.J. Miller J.J. Phelan P.F. Schultz L. Voyvodic R.J. Walker E.W. Anderson H.B. Crawley A. Firestone W.J. Kernan F. Ogino D.L. Parker D.G. Hill M. Kazuno F. Svrcek 《Nuclear Physics B》1976,116(1):13-27
Semi-inclusive π? cross sections in 200 and 300 GeV/c pp interactions are presented and compared with lower energy data. In the target fragmentation region the data are compared to the hypothesis of semi-inclusive KNO scaling. The energy and charge multiplicity dependences of the semi-inclusive cross sections in the central region are studied and a simple parametrization of the semi-inclusive density function is described. 相似文献
57.
A. Breakstone R. Campanini H. B. Crawley M. Cuffiani G. M. Dallavalle M. M. Deninno K. Doroba D. Drijard F. Fabbri A. Firestone H. G. Fischer H. Flöge H. Frehse W. Geist L. Gesswein G. Giacomelli R. Gokieli M. Gorbics M. Gorski P. Hanke M. Heiden W. Herr D. Isenhower E. E. Kluge J. W. Lamsa T. Lohse R. Mankel W. T. Meyer T. Nakada M. Panter A. Putzer K. Rauschnabel B. Rensch F. Rimondi M. Schmelling G. P. Siroli R. Sosnowski M. Szczekowski O. Ullaland D. Wegener R. Yeung 《Zeitschrift fur Physik C Particles and Fields》1988,40(2):207-214
The contribution of single diffraction dissociation to highp T particle production has been determined with the split field magnet detector. For transverse momentap T >2 GeV/c and production angles θ>10° it is found to be less than 5% for all types of trigger particles. Specifically, a diffractive origin of the large production cross section for highp T protons can be excluded. The contributions found to highp T production are found to be in good agreement with extrapolations of the relative particle yields from single diffraction dissociation observed in inelastic minimum bias events. 相似文献
58.
Matt Jellicoe Aghil Igder Clarence Chuah Darryl B. Jones Xuan Luo Keith A. Stubbs Emily M. Crawley Scott J. Pye Nikita Joseph Kasturi Vimalananthan Zoe Gardner David P. Harvey Xianjue Chen Filomena Salvemini Shan He Wei Zhang Justin M. Chalker Jamie S. Quinton Youhong Tang Colin L. Raston 《Chemical science》2022,13(12):3375
Mixing immiscible liquids typically requires the use of auxiliary substances including phase transfer catalysts, microgels, surfactants, complex polymers and nano-particles and/or micromixers. Centrifugally separated immiscible liquids of different densities in a 45° tilted rotating tube offer scope for avoiding their use. Micron to submicron size topological flow regimes in the thin films induce high inter-phase mass transfer depending on the nature of the two liquids. A hemispherical base tube creates a Coriolis force as a ‘spinning top’ (ST) topological fluid flow in the less dense liquid which penetrates the denser layer of liquid, delivering liquid from the upper layer through the lower layer to the surface of the tube with the thickness of the layers determined using neutron imaging. Similarly, double helical (DH) topological flow in the less dense liquid, arising from Faraday wave eddy currents twisted by Coriolis forces, impact through the less dense liquid onto the surface of the tube. The lateral dimensions of these topological flows have been determined using ‘molecular drilling’ impacting on a thin layer of polysulfone on the surface of the tube and self-assembly of nanoparticles at the interface of the two liquids. At high rotation speeds, DH flow also occurs in the denser layer, with a critical rotational speed reached resulting in rapid phase demixing of preformed emulsions of two immiscible liquids. ST flow is perturbed relative to double helical flow by changing the shape of the base of the tube while maintaining high mass transfer between phases as demonstrated by circumventing the need for phase transfer catalysts. The findings presented here have implications for overcoming mass transfer limitations at interfaces of liquids, and provide new methods for extractions and separation science, and avoiding the formation of emulsions.Micron to submicron size Coriolis and Faraday wave induced high shear topological flow regimes in 45° titled rapidly rotating tubes result in high inter-phase mass transfer of immiscible liquids and spontaneous demixing. 相似文献
59.
Emily M. Crawley Scott Pye Briony E. Forbes Colin L. Raston 《Molecules (Basel, Switzerland)》2022,27(3)
In peptide production, oxidative sulfitolysis can be used to protect the cysteine residues during purification, and the introduction of a negative charge aids solubility. Subsequent controlled reduction aids in ensuring correct disulfide bridging. In vivo, these problems are overcome through interaction with chaperones. Here, a versatile peptide production process has been developed using an angled vortex fluidic device (VFD), which expands the viable pH range of oxidative sulfitolysis from pH 10.5 under batch conditions, to full conversion within 20 min at pH 9–10.5 utilising the VFD. VFD processing gave 10-fold greater conversion than using traditional batch processing, which has potential in many applications of the sulfitolysis reaction. 相似文献
60.
荧光寿命的快速傅里叶变换拟合方法 总被引:5,自引:2,他引:5
介绍了一种利用快速傅里叶变换算法对稀土掺杂物质的荧光寿命进行数据拟合的方法。稀土掺杂物质可用来制备多种光学传感器,用于温度、pH值等多种参量测量领域。本方法利用快速傅里叶变换(FFT)结果作为基础,从非零项的相位角的正切值得出被测的荧光寿命,具有速度快、误差小、不受本底干扰等一系列优点。以掺铒光纤为例,通过数字仿真将本方法与其它几种传统的拟合方法进行了比较。快速傅里叶变换方法的测量偏差不到Prony方法的50%,为对数似合(log-fit)方法测量偏差的1/6。另外,快速傅里叶变换方法由于不受本底噪声影响,可以不必在信号处理时去掉本底噪声,因而可以明显缩短测量时间。 相似文献