The microstrip antenna with PBG used for 3G system

Aiming at the request of the antenna used for 3G system, we first analyze the characteristics of microstrip antenna and design methods of size structure, and then design the microstrip antenna with PBG by using MWO. The detailed analysis inquiries into the influence on the reflection coefficient S-11 by key parameters, such as the length of PBG sides, the structural periodicity of PBG, the feeding point of antenna, the dielectric constant and thickness of circuit board have been studied. Finally, the design principles and advantages of the microstrip antenna with PBG are summarized

A Novel Printed Folded Dipole Antenna Used for Modem RFID System

For the minimization of RFID tag antenna, we designed a printed folded dipole antenna working at 2.4 GHz. And a mirror compensation technology was introduced to improve the radiation feature of antenna with better return loss characteristic and directivity. The simulated results show that when VSWR (Vertical Standing Wave Ratio) is less than 2, the antenna bandwidth is up to 0.39 GHz absolutely and to 15.48% relatively. Considering engineering processes, the influences of dielectric constant epsilon(r), board thickness, folding degree and other parameters on the properties of this antenna are particularly studied. On the basis, a dual-frequency folded dipole antenna is proposed, which can work in two main frequency for RFED system, i.e. 915 MHz and 2.4 GHz. Moreover, an antenna sample made on this novel structure has been tested and the results show that the bandwidth of antenna is improved in further, along with hemisphere directional radiation characteristics

A Novel Ceramic Fractal Antenna for Modern RFID System

A novel double bands ceramic fractal antenna working at 2.4 GHz and 5.8 GHz is designed for the minimization requirement of RFID tag antenna. The simulated results show that when VSWR (Vertical Standing Wave Ratio) is less than 2, the antenna absolute bandwidths are up to 0.39 GHz and 1.85 GHz in 2.4 GHz and 5.8 GHz respectively, with relative bandwidths up to 15.20% and 35.82% respectively,. Considering engineering processes, the influence of dielectric constant F, and substrate thickness are studied in detail. At last we proposed an optimized antenna with duel fractal structure, which can cover all primary frequency bands of RFID system, from 2.17 GHz to 7.05 GHz

A Ceramic Spiral Antenna used for Modern RFID System

For the requirements of wideband RFID antenna, we designed a ceramic spiral antenna working at 915 MHz. The simulated results show that when VSWR (Vertical Standing Wave Ratio) is less than 2, the antenna bandwidth is up to 1.22 GHz (0.57 similar to 1.79 GHz) absolutely and to 133.21% relatively at the central frequency of 0.9 GHz. Considering engineering processes, the influence of dielectric constant epsilon(r) and thickness of circuit board are particularly studied. On this basis, a dual-frequency ceramic spiral antenna is proposed, which can work with respect to all the main frequencies of RFID system, i.e. 915 MHz and 2.4 GHz

Fusobacterium nucleatum induces colon anastomosis leak by activating epithelial cells to express MMP9

BackgroundDespite advances in anastomotic techniques and perioperative care, the incidence of anastomotic leak (AL) has not substantially decreased over time. Although it is known that AL etiology is multifactorial and the mechanisms involved remain unclear, there is accumulating evidence pointing at AL related to gut microbiota.MethodWe firstly performed a clinical study to analyze the gut microbiota between colorectal cancer patients who developed AL and those who did not (nAL) using 16S-rRNA sequencing and quantitative real-time PCR to identify AL risk bacterial taxa. Then we built a rat anastomosis model and performed a bacteria transplantation to ensure the cause-effect relationship. The anastomotic healing score was used to evaluate the healing of anastomosis. In addition, we assessed the adhesion ability of bacteria by staining with fluorescein isothiocyanate and attachment assay. The expression of matrix metalloproteinase 9 (MMP9) was detected by western blot, and the activity was detected by gelatin zymography.ResultsWe found that the abundance and positive rate of Fusobacterium nucleatum (Fn) were higher in the AL patients. Exposure of the rat’s colon anastomosis to Fn contributes to the loss of submucosa collagen I and III, leading to AL’s pathogenesis. Fn can attach to the gut epithelial cells and stimulate intestinal MMP9 expression in vitro and in vivo. We further confirmed that these effects of Fn depended on the E-cadherin/β-catenin signaling pathway.ConclusionThis work demonstrates that Fn attaches and then stimulates the expression of epithelial cells MMP9 by the E-cadherin/β-catenin signaling pathway. These effects contribute to collagen break down in the intestinal tissue, finally leading to AL

THREE TO TWO CURVE FRACTAL FOLDED DIPOLE ANTENNA FOR RFID APPLICATION

Fujian Provincial Key Project [2007H0036]; Guangdong Provincial Education Ministry of China [2007B090400059]A 3/2 curve fractal dipole antenna was proposed for radio-frequency identification application. with mirror and photonic hand gap structure. Sonic properties of the antenna. such as return loss and bandwidth have been simulated and investigated. The results show that the absolute bandwidths of antenna are up to 0.28 GHz and 0.41 GHz at 2.4 GHz and 5.8 GHz, respectively accordingly the relative bandwidths up to 9.76% and 6.87%. With a prototype fabricated, we also verified the good performance of the antenna through the comparison of measured and simulated results. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1827-1830, 2010: Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.2532

A Dual-frequency Ceramic Spiral Antenna with Rectangle PBG Structure Array used for Modern RFID System

For wideband RFID systems, we designed a dual-frequency ceramic spiral antenna with rectangle PBG structure array, working well with respect to the main frequencies of 915 MHz and 2.4 GHz. The size of the antenna is minimized obviously, only 30 mm x 30 mm x 1 mm. The simulated results show that the working center frequency in lower and higher frequency sections are 0.95 GHz and 2.55 GHz separately, at which the return loss values S(11) are -23.22 dB and -15.98 dB respectively. And for VSWR less than 2, the absolute antenna bandwidths apartly are up to 0.254 GHz (0.837 similar to 1.091 GHz) and 1.02 GHz (2.157 similar to 3.177GHz). Considering engineering processes, the influences of dielectric constant epsilon(r) and thickness of circuit board on the performance of antenna are particularly studied. We also discussed the rectangle PBG structure array in detail, including its length, width and arrangement regulation. At last, the contrast analysis on different radiation characteristics of the antenna while being sticked on various materials has been done to validate the function stability

An Antenna with fractal PBG Structure designed for Modern UWB System

For the requirements of ultra-wideband (UWB) antenna, we designed a meandered-line antenna with fractal PBG structure, which can completely cover all the frequency segments of UWB system. (3.1 similar to 10.6 GHz). The size of the antenna is minimized greatly, only 30 mm x 32 mm x 0.8 mm. The simulated results show that for VSWR less than 2, the working frequency segment of the antenna is 2.91 similar to 11.53 GHz, at which the lowest return loss value S(11) is -17.17 dB. Meanwhile, the antenna bandwidth is up to 8.62 GHz absolutely and 119.39% relatively; the frequency multiple bandwidth is up to 3.96 GHz. Considering the engineering processes, the influences of dielectric constant epsilon(r) and thickness of circuit board on the antenna's performance are particularly studied. We also discussed the fractal PBG structure in detail, including its size and arrangement regulation. At last, the contrast analysis on different radiation characteristics of the antenna while being sticked on various materials has been done to validate the function stability

Derived Neutrophil-Lymphocyte Ratio and C-Reactive Protein as Prognostic Factors for Early-Stage Non-Small Cell Lung Cancer Treated with Stereotactic Body Radiation Therapy

Objectives: To explore the relationship between peripheral blood inflammation parameters and overall survival (OS) and progression-free survival (PFS) of early-stage non-small cell lung cancer patients who underwent stereotactic body radiotherapy (SBRT). Patients and methods: In this study, eligible patients treated with SBRT from 2013 to 2018, and both serum complete blood count and blood biochemical results were available prior to (within 60 days) radiotherapy were included. Results: A review of hospital registries identified 148 patients, and the 5-year OS and PFS of the entire cohort were 69.8% and 65.6%, respectively, with the median follow-up time was 52.8 months. Multivariable analysis showed that derived neutrophil-lymphocyte ratio (dNLR) ≥1.4 and C-reactive protein (CRP) ≥2.9 were statistically and independently associated with worse OS (HR = 4.62, 95% CI 1.89–11.27, p = 0.001; HR = 2.92, 95% CI 1.49–5.70, p = 0.002, respectively). The 5-year OS for patients with dNLR below and equal to or above the 1.4 were 85.3% and 62.9% (p = 0.002), respectively, and 76.7% for the low CRP group versus 58.5% for the high CRP group (p = 0.030). Higher serum level of post-treatment CRP also independent parameters for inferior PFS (HR = 4.83, 95% CI 1.28–18.25, p = 0.020). Conclusions: Our results demonstrate that dNLR and CRP are associated with the outcomes of early-stage NSCLC patients treated with SBRT, which may assist in selecting optimal nursing care and therapeutic scheme for every individual

Naringenin Protects against Acute Pancreatitis in Two Experimental Models in Mice by NLRP3 and Nrf2/HO-1 Pathways

Background. Naringenin (Nar) is a type of flavonoid and has been shown to have anti-inflammatory and antioxidative properties. However, the effects of Nar on acute pancreatitis (AP) have not been well studied. In this study, we aimed to investigate the function of Nar in a mouse model of AP. Methods. Mild acute pancreatitis (MAP) was induced by caerulein (Cae), and severe acute pancreatitis (SAP) was induced by L-arginine in mice. Nar was administered intraperitoneally at doses of 25, 50, or 100 mg/kg following MAP induction and at a dose of 100 mg/kg following SAP induction. The serum levels of cytokines, lipase, and amylase were determined, and pancreatic and pulmonary tissues were harvested. Results. The serum levels of amylase, lipase, and cytokines were significantly decreased in both MAP and SAP models after Nar treatment. The malondialdehyde (MDA) levels of the pancreatic tissue was significantly reduced in both MAP and SAP after Nar treatment. In contrast, glutathione peroxidase (GPx), glutathione reductase (GR), glutathione S-transferase (GST), total sulfhydryl (T-SH), and non-proteinsulthydryl (NP-SH) were markedly increased in both MAP and SAP after Nar treatment. The injury in pancreatic and pulmonary tissues was markedly improved as evidenced by the inhibited expression of myeloperoxidase, nod-like receptor protein 3, and interleukin 1 beta as well as the enhanced expression of nuclear factor erythroid 2-related factor 2/heme oxygenase-1 in pancreatic tissues. Conclusions. Nar exerted protective effects on Cae-induced MAP and L-arginine-induced SAP in mice, suggesting that Nar may be a potential therapeutic intervention for AP