Ginzburg-Landau-type theory of non-polarized spin superconductivity

Since the concept of spin superconductor was proposed, all the related studies concentrate on spin-polarized case. Here, we generalize the study to spin-non-polarized case. The free energy of non-polarized spin superconductor is obtained, and the Ginzburg-Landau-type equations are derived by using the variational method. These Ginzburg-Landau-type equations can be reduced to the spin-polarized case when the spin direction is fixed. Moreover, the expressions of super linear and angular spin currents inside the superconductor are derived. We demonstrate that the electric field induced by super spin current is equal to the one induced by equivalent charge obtained from the second Ginzburg-Landau-type equation, which shows self-consistency of our theory. By applying these Ginzburg-Landau-type equations, the effect of electric field on the superconductor is also studied. These results will help us get a better understanding of the spin superconductor and the related topics such as Bose-Einstein condensate of magnons and spin superfluidity.Comment: 9 pages, 5 figure

catena-Poly[[iodidocopper(I)]-μ-4,4′,6,6′-tetra­methyl-2,2′-(ethyl­enedithio)dipyrimidine-κ2 N:N′]

In the title coordination polymer, [CuI(C14H18N4S2)]n, the CuI center is trigonally coordinated by two pyrimidine N-atom donors from two distinct dithio­ether ligands and one iodide anion. The Cu and I atoms are located on a twofold axis, whereas the midpoint of the central C—C bond of the dithio­ether ligand is located on an inversion center. Each organic ligand, acting in a bidentate mode, bridges two CuI ions, resulting in the formation of polymeric zigzag chains. The dihedral angle between the two pyrimidine units bonded to the metal center is 88.01 (2)°. The crystal packing is mainly stabilized by van der Waals forces and π–π stacking inter­actions, with an inter­planar distance between the pyrimidine rings of adjacent chains of 3.638 (3) Å

Impulse-based reciprocal measurement of the transfer functions of underwater structure

An impulse-based reciprocal method is proposed for measuring the transfer functions of underwater structure. This method uses an impulse sound source, and the volume velocity of source is derived from the detected sound pressure. The influences of the reverberant sound field on the detected sound pressure are eliminated by an operation with time gates. Numerical simulation verifies that this impulses-based reciprocal measurement can obtain results with accuracy similar to the traditional reciprocal measurement method using electromagnetic source. Because much less time is required in the impulse-based measurement, the time efficiency is boosted. This method is also validated in a lake experiment, and the experimental result shows that the influences of the reverberant field on the derived volume velocity are eliminated

Zonal Patterns of Delta C-13, Delta N-15 and Po-210 In the Tropical and Subtropical North Pacific

Nitrogen fixation process may supply a significant fraction of bioavailable nitrogen to surface waters, increase the oceanic sequestration of atmospheric CO2, and alter the distribution of geochemical parameters. We report a zonal pattern of delta N-15 and delta C-13 in particulate organic matter (POM), and ratios of particulate Po-210 to dissolved Po-210 along a transect through the subtropical and tropical North Pacific. Both N-15 and Po-210 signals indicated an enhanced N-2 fixation in the northwestern subtropical North Pacific. The eastward decrease of N-2 fixation along this transect testified the role of aeolian Fe and P in controlling marine N-2 fixation. Associated with the zonal variations of N-15 and Po-210, the delta C-13 of suspended POM increased eastward, reflecting the decrease of anthropogenic CO2 concentration in surface seawater from west to east in the study area. Our results highlight the need to examine more closely the mechanisms of possible longitudinal variation in N-2 fixation in the ocean and the role of aeolian Fe and P in controlling marine N-2 fixation and anthropogenic CO2

Chlorido[6-phenyl-4-(p-tol­yl)-2,2′-bipyridyl-κ2 N,N′]platinum(II)

The asymmetric unit of the title compound, [Pt(C23H17N2)Cl], contains two independent mol­ecules with distinct dihedral angles between the central pyridyl and methylbenzene rings [7.77 (2) and 24.07 (2)°]. Short inter­molecular distances [3.582 (6) and 3.600 (6) Å] between the outer pyridine and the PtNC3 and PtN2C2 rings, respectively, indicate the existence of π–π inter­actions, which link the mol­ecules into stacks along the a axis. The crystal structure is further stabilized by weak C—H⋯π inter­actions

Association of renin–angiotensin system inhibitors use with short- and long-term mortality in patients with aortic stenosis: A systematic review and meta-analysis

PurposeThe present study aimed to investigate the association of renin–angiotensin system inhibitors (RASi) with short- and long-term mortality in patients with aortic stenosis (AS).MethodsA systematic search was performed in PubMed, Embase, and Cochrane library databases for relevant studies published before March 2022. Studies meeting the inclusion criteria were included to assess the effect of RASi on short-term (≤30 days) and long-term (≥1 year) mortality in patients with AS.ResultsA total of 11 studies were included in the meta-analysis. Our results demonstrated that RASi reduced short-term mortality (OR = 0.76, 95% CI 0.63–0.93, p = 0.008) after aortic valve replacement (AVR). Subgroup analysis revealed that RASi was still associated with lower short-term mortality after transcatheter aortic valve replacement (TAVR); however, the association was relatively weak in patients who underwent surgical aortic valve replacement (SAVR). For long-term mortality, the pooled OR was 1.04 (95% CI 0.88–1.24, p = 0.63) after sensitivity analysis in patients who did not undergo AVR. In addition, our study confirmed that RASi significantly reduced long-term mortality (OR = 0.57, 95% CI 0.44–0.74, p < 0.0001) in patients who underwent AVR. Subgroup analysis showed that both TAVR and SAVR groups treated with RASi had lower long-term mortality.ConclusionRenin–angiotensin system inhibitors did not change long-term mortality in AS patients who did not undergo AVR. However, RASi reduced short- and long-term mortality in patients who underwent AVR

Progress in Research and Application of Insect-resistant Packaging for Grain Storage

Stored grain is extremely vulnerable to the storage insects during storage and processing. At present, chemical control is still the main method for controlling stored grain insects. However, the increasing resistance of insects caused by long-term use of chemical control raises unprecedented challenges. Insect-repellent packaging, as a traditional and emerging physical insect prevention method, has increasingly attracted widespread attention among people. The types and characteristics of food packaging materials, the types and application of insect-repellent packaging, the research and evaluating methods of insect-repellent packaging at home and abroad, and the problems existing in the practical application of insect-repellent packaging were reviewed, and the development trend of insect-repellent packaging was prospected, so as to provide reference information for the scientific and efficient use of insect-repellent packaging, development of new insect-repellent packaging to control stored grain insects in the future