77 research outputs found
Power law hopping of single particles in one-dimensional non-Hermitian quasicrystals
In this paper, a non-Hermitian Aubry-Andr\'e-Harper model with power-law
hoppings () and quasiperiodic parameter is studied, where
is the power-law index, is the hopping distance, and is a member of
the metallic mean family. We find that under the weak non-Hermitian effect,
there preserves regimes where the fraction of ergodic
eigenstates is -dependent as L ( is the system size)
similar to those in the Hermitian case. However, regimes are ruined
by the strong non-Hermitian effect. Moreover, by analyzing the fractal
dimension, we find that there are two types of edges aroused by the power-law
index in the single-particle spectrum, i.e., an ergodic-to-multifractal
edge for the long-range hopping case (), and an ergodic-to-localized edge
for the short-range hopping case (). Meanwhile, the existence of these two
types of edges is found to be robust against the non-Hermitian effect. By
employing the Simon-Spence theory, we analyzed the absence of the localized
states for . For the short-range hopping case, with the Avila's global
theory and the Sarnak method, we consider a specific example with to
reveal the presence of the intermediate phase and to analytically locate the
intermediate regime and the ergodic-to-multifractal edge, which are
self-consistent with the numerically results.Comment: 8 pages, 8 figure
catena-Poly[[[bis(methylamine)zinc(II)]-μ-4,4′-oxydibenzoato] N,N-dimethylacetamide solvate]
In the title zinc(II) coordination polymer, {[Zn(C14H8O5)(CH5N)2]·C4H9NO}n, each Zn(II) cation is tetrahedrally coordinated by two carboxylato O atoms of two oba anions (H2oba is 4,4′-oxydibenzoic acid), and two N atoms from two methylamine molecules. Each oba anion bridges two Zn(II) cations through the two carboxylate groups in a monodentate fashion, forming one-dimensional polymeric chains. These chains are linked via N–H⋯O hydrogen bonds, forming a two-dimensional supramolecular network
Isolation and Characterization of 89K Pathogenicity Island-Positive ST-7 Strains of Streptococcus suis Serotype 2 from Healthy Pigs, Northeast China
Streptococcus suis is a swine pathogen which can also cause severe infection, such as meningitis, and streptococcal-like toxic shock syndrome (STSS), in humans. In China, most of the S. suis infections in humans were reported in the southern areas with warm and humid climates, but little attention had been paid to the northern areas. Data presented here showed that the virulent serotypes 1, 2, 7, and 9 of S. suis could be steadily isolated from the healthy pigs in the pig farms in all the three provinces of Northeast China. Notably, a majority of the serotype 2 isolates belonged to the 89K pathogenicity island-positive ST-7 clone that had historically caused the human STSS outbreaks in the Sichuan and Jiangsu provinces of China, although the human STSS case caused by S. suis had never been reported in northern areas of China. Data presented here indicated that the survey of S. suis should be expanded to or reinforced in the northern areas of China
Gate-Tunable Critical Current of the Three-Dimensional Niobium Nano-Bridge Josephson Junction
Recent studies have shown that the critical currents of several metallic
superconducting nanowires and Dayem bridges can be locally tuned using a gate
voltage {V_g}. Here, we report a gate-tunable Josephson junction structure
constructed from a three-dimensional (3D) niobium nano-bridge junction (NBJ)
with a voltage gate on top. Measurements up to 6 K showed that the critical
current of this structure can be tuned to zero by increasing {V_g}. The
critical gate voltage Vgc was reduced to 16 V and may possibly be reduced
further by reducing the thickness of the insulation layer between the gate and
the NBJ. Furthermore, the flux modulation generated by Josephson interference
of two parallel 3D NBJs can also be tuned using {V_g} in a similar manner.
Therefore, we believe that this gate-tunable Josephson junction structure is
promising for superconducting circuit fabrication at high integration levels.Comment: 15 pages, 5 figure
Geometric Scaling of the Current-Phase Relation of Niobium Nano-Bridge Junctions
The nano-bridge junction (NBJ) is a type of Josephson junction that is
advantageous for the miniaturization of superconducting circuits. However, the
current-phase relation (CPR) of the NBJ usually deviates from a sinusoidal
function which has been explained by a simplified model with correlation only
to its effective length. Here, we investigated both measured and calculated
CPRs of niobium NBJs of a cuboidal shape with a three-dimensional bank
structure. From a sine-wave to a saw-tooth-like form, we showed that deviated
CPRs of NBJs can be described quantitatively by its skewness {\Delta}{\theta}.
Furthermore, the measured dependency of {\Delta}{\theta} on the critical
current {I_0} from 108 NBJs turned out to be consistent with the calculated
ones derived from the change in geometric dimensions. It suggested that the
CPRs of NBJs can be tuned by their geometric dimensions. In addition, the
calculated scaling behavior of {\Delta}{\theta} versus {I_0} in
three-dimensional space was provided for the future design of superconducting
circuits of a high integration level by using niobium NBJs.Comment: 20 pages, 10 figure
Isolation and Characterization of 89K Pathogenicity Island-Positive ST-7 Strains of Streptococcus suis Serotype 2 from Healthy Pigs, Northeast China
Relationships Between Social Support, Loneliness, and Internet Addiction in Chinese Postsecondary Students: A Longitudinal Cross-Lagged Analysis
Using the Internet has become one of the most popular leisure activities among postsecondary students in China. Concern about the large number of students using the Internet has led to an increase in research on the influencing factors of Internet addiction and the negative consequences caused by it. This short-term longitudinal study examined the associations among three dimensions of social support [objective support (OS), subjective support (SS), and support utilization (SU)], loneliness, and the four dimensions of Internet addiction (compulsive Internet use [CIU] & withdrawal from Internet addiction [WIA], tolerance of Internet addiction [TIA], time-management problems [TMPs], and interpersonal and health problems [IHPs]) in a Chinese sample. A total of 169 postsecondary first-year students (88 girls and 81 boys; mean age = 18.31 years) participated in the study. The questionnaire measurements were taken at the beginning of the school year (T1), 6 months later (T2), and 1 year later (T3). Cross-lagged and structural equation modeling analyses indicated that (a) OS (T1) and SU (T1) negatively predicted loneliness (T2); and loneliness (T2) negatively predicted OS (T3) and SU(T3); (b) CIU & WIA (T1) and TMPs (T1) positively predicted loneliness (T2); and loneliness (T2) positively predicted CIU & WIA (T3), TIA (T3), TMP (T3), and IHP (T3); (c) SS (T1) directly affected TIA (T3) and TMP (T3); and (d) loneliness (T2) played a mediating role in the relationships between OS (T1) and CIU (T3), OS (T1) and TMP (T3), OS (T1) and IHP (T3), and SU (T1) and IHP (T3). Finally, interventions for Internet addiction and implications for future studies were discussed
Expression and clinical value of CXCR4 in high grade gastroenteropancreatic neuroendocrine neoplasms
BackgroundCXC chemokine receptor 4 (CXCR4) is associated with the progression and metastasis of numerous malignant tumors. However, its relationship with Gastroenteropancreatic Neuroendocrine Neoplasms Grade 3 (GEP-NENs G3) is unclear. The aim of this study was to characterize the expression of CXCR4 in GEP-NENS and to explore the clinical and prognostic value of CXCR4.MethodsThis study retrospectively collected clinical and pathological data from patients with GEP-NENs who receiving surgery in Qilu Hospital of Shandong University from January 2013 to April 2021, and obtained the overall survival of the patients based on follow-up. Immunohistochemistry (IHC) was performed on pathological paraffin sections to observe CXCR4 staining. Groups were made according to pathological findings. Kaplan-Meier (K-M) curve was used to evaluate prognosis. SPSS 26.0 was used for statistical analysis.Results100 GEP-NENs G3 patients were enrolled in this study. There was a significant difference in primary sites (P=0.002), Ki-67 index (P<0.001), and Carcinoembryonic Antigen (CEA) elevation (P=0.008) between neuroendocrine tumor (NET) G3 and neuroendocrine carcinoma (NEC). CXCR4 was highly expressed only in tumors, low or no expressed in adjacent tissues (P<0.001). The expression level of CXCR4 in NEC was significantly higher than that in NET G3 (P=0.038). The K-M curves showed that there was no significant difference in overall survival between patients with high CXCR4 expression and patients with low CXCR4 expression, either in GEP-NEN G3 or NEC (P=0.920, P=0.842. respectively).ConclusionDifferential expression of CXCR4 was found between tumor and adjacent tissues and between NET G3 and NEC. Our results demonstrated that CXCR4 can be served as a new IHC diagnostic indicator in the diagnosis and differential diagnosis of GEP-NENs G3. Further studies with multi-center, large sample size and longer follow-up are needed to confirm the correlation between CXCR4 expression level and prognosis
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