Archives, Room Use Only - TK6545.L4 M55 1925

Archives, Room Use Only - TK9.F54 1931

Archives, Room Use Only - TK151.B43 1901

Archives, Room Use Only - TK5743.G74 1915

Archives, Room Use Only - TK5107.5.F8 M66 1921

Archives, Room Use Only - QC761.W54 1876

Police confused over appropriate provisions to be invoked against offenders

Delhi Police has arrested AAP MLA from Devli Prakash Jarwal and his aide, Kapil Nagar, for allegedly abetting the suicide of a doctor who used to run a water tanker business in the area. The doctor, Rajender Singh, had accused Jarwal and Nagar of extorting money from him for letting him run the business.

Praising the Centre for CAA, he said: "I do not understand why Muslims are protesting against the Citizenship Amendment Act. CAA is not for the Muslims who were born here."

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Doctor suicide: AAP legislator held in Delhi

The Kuniyamuthur police here have registered a case against Naam Tamilar Katchi coordinator Seeman for allegedly speaking against the Central Governme

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X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of the monochromated beam is inevitable. Here we report performance tests of novel, asymmetrically cut, channel-cut crystals which reduce the beam movements by more than a factor of 20 relative to the symmetric case over the typical energy range of an EXAFS spectrum at the Cu K-edge. In addition, the presented formulas for the beam offset including the asymmetry angle directly indicate the importance of this value, which has been commonly neglected so far in the operation of double-crystal monochromators.

Small-animal physiology studies are typically complicated, but the level of complexity is greatly increased when performing live-animal X-ray imaging studies at synchrotron and compact light sources. This group has extensive experience in these types of studies at the SPring-8 and Australian synchrotrons, as well as the Munich Compact Light Source. These experimental settings produce unique challenges. Experiments are always performed in an isolated radiation enclosure not specifically designed for live-animal imaging. This requires equipment adapted to physiological monitoring and test-substance delivery, as well as shuttering to reduce the radiation dose. Experiment designs must also take into account the fixed location, size and orientation of the X-ray beam. This article describes the techniques developed to overcome the challenges involved in respiratory X-ray imaging of live animals at synchrotrons, now enabling increasingly sophisticated imaging protocols.

Multilayer monochromator devices are commonly used at (imaging) beamlines of synchrotron facilities to shape the X-ray beam to relatively small bandwidth and high intensity. However, stripe artefacts are often observed and can deteriorate the image quality. Although the intensity distribution of these artefacts has been described in the literature, their spectral distribution is currently unknown. To assess the spatio-spectral properties of the monochromated X-ray beam, the direct beam has been measured for the first time using a hyperspectral X-ray detector. The results show a large number of spectral features with different spatial distributions for a [Ru, B4C] strip monochromator, associated primarily with the higher-order harmonics of the undulator and monochromator. It is found that their relative contributions are sufficiently low to avoid an influence on the imaging data. The [V, B4C] strip suppresses these high-order harmonics even more than the former, yet at the cost of reduced efficiency.