Poly[triaqua­(μ-butane-1,2,3,4-tetra­carboxyl­ato)dicadmium(II)]

The asymmetric unit of the title CdII coordination polymer, [Cd2(C8H6O8)(H2O)3]n, contains two crystallographically independent CdII cations, one-half each of two independent anionic butane-1,2,3,4-tetra­carboxyl­ate units (L) and three water mol­ecules. Both anionic units lie on inversion centers. One of the CdII ions is six-coordinated by four carboxyl­ate O atoms from four L anions and two water O atoms in a distorted octa­hedral coordination environment. The other CdII ion is eight-coordinated by seven carboxyl­ate O atoms from four L anions and one water O atom. The anionic units bridge neighboring CdII centers, forming a three-dimensional framework. O—H⋯O hydrogen-bonding inter­actions between the water mol­ecules and carboxyl­ate O atoms further stabilize the structure

Transverse momentum resummation for color sextet and antitriplet scalar production at the LHC

We study the factorization and resummation of the transverse momentum spectrum of the color sextet and antitriplet scalars produced at the LHC based on soft-collinear effective theory. Compared to Z boson and Higgs production, a soft function is required to account for the soft gluon emission from the final-state colored scalar. The soft function is calculated at the next-to-leading order, and the resummation is performed at the approximate next-to-next-to-leading logarithmic accuracy. The non-perturbative effects and PDF uncertainties are also discussed.Comment: 20 pages, 7 figure

Poly[[μ2-2,2′-diethyl-1,1′-(butane-1,4-di­yl)diimidazole-κ2 N 3:N 3′](μ2-5-hydroxy­isophthalato-κ2 O 1:O 3)zinc]

In the title coordination polymer, [Zn(C8H4O5)(C14H22N4)]n, the ZnII cation is coordinated by an O2N2 donor set in a distorted tetra­hedral geometry. The ZnII ions are linked by μ2-OH-bdc (OH-H2bdc = 5-hy­droxy­isophthalic acid) and bbie ligands [bbie = 2,2′-diethyl-1,1′-(butane-1,4-di­yl)diimidazole], forming a two-dimensional layer parallel to the ab plane. The layers are further connected through intermolecular C—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional supramolecular structure. In the bbie ligand, the two C atoms in the ethyl group are each disordered over two positions with a site-occupancy ratio of 0.69:0.31

Reduction of motion artifact in pulse oximetry by smoothed pseudo Wigner-Ville distribution

BACKGROUND: The pulse oximeter, a medical device capable of measuring blood oxygen saturation (SpO2), has been shown to be a valuable device for monitoring patients in critical conditions. In order to incorporate the technique into a wearable device which can be used in ambulatory settings, the influence of motion artifacts on the estimated SpO2 must be reduced. This study investigates the use of the smoothed psuedo Wigner-Ville distribution (SPWVD) for the reduction of motion artifacts affecting pulse oximetry. METHODS: The SPWVD approach is compared with two techniques currently used in this field, i.e. the weighted moving average (WMA) and the fast Fourier transform (FFT) approaches. SpO2 and pulse rate were estimated from a photoplethysmographic (PPG) signal recorded when subject is in a resting position as well as in the act of performing four types of motions: horizontal and vertical movements of the hand, and bending and pressing motions of the finger. For each condition, 24 sets of PPG signals collected from 6 subjects, each of 30 seconds, were studied with reference to the PPG signal recorded simultaneously from the subject's other hand, which was stationary at all times. RESULTS AND DISCUSSION: The SPWVD approach shows significant improvement (p < 0.05), as compared to traditional approaches, when subjects bend their finger or press their finger against the sensor. In addition, the SPWVD approach also reduces the mean absolute pulse rate error significantly (p < 0.05) from 16.4 bpm and 11.2 bpm for the WMA and FFT approaches, respectively, to 5.62 bpm. CONCLUSION: The results suggested that the SPWVD approach could potentially be used to reduce motion artifact on wearable pulse oximeters

Spatial popularity and similarity of watching videos in a large city

With the popularity of watching mobile videos, many works focus on the geographic features of user viewing behaviors, but few study them in the context of an entire metropolitan city. Different regions of a large city have different intensity of economy activities with respect to their different distances to the downtown, and how this will influence video popularity and similarity is still unclear. To quantitatively study the spatial popularity and similarity of watching videos in a large urban environment, we collect a dataset with two-month video view requests from the largest network provider in Shanghai, containing top six content providers, and study the spatial features of video access in regions of different scales. We find that 1) video popularity and similarity exist at different scales of city division; 2) the concentration of video popularity becomes higher as the region is closer to downtown; 3) when comparing the regions of same scale, the similarity of popular videos becomes lower as the region is farther away from the downtown. Finally, we correlate our findings with cache deployment, advertising and video recommendation to illustrate the implication

Poly[[diaqua­bis­(μ3-3-carboxyl­ato-4-hy­droxy­benzene­sulfonato)­tri-μ2-pyrazine-tetra­silver(I)] dihydrate]

The title coordination polymer, {[Ag4(C7H4O6S)2(C4H4N2)3(H2O)2]·2H2O}n, contains two independent AgI ions. One AgI ion is coordinated by one O atom from a 3-carboxyl­ato-4-hy­droxy­benzene­sulfonate (L) ligand, two N atoms from two pyrazine ligands and a water mol­ecule. The other AgI ion is coordinated by two O atoms from two L ligands and one N atom from a pyrazine ligand. One of the pyrazine ligands lies on an inversion center. The L and pyrazine ligands link the AgI ions into polymeric layers parallel to the ac plane. The layers are connected by inter­molecular O—H⋯O hydrogen bonds. An intra­molecular O—H⋯O hydrogen bond is also present in the L ligand