Study on the law of air leakage in goaf under the influence of double-series coal seam mining.

In order to solve the engineering problem of a large amount of wind leakage in the 8106 comprehensive mining working face of the Carboniferous System under the influence of overlapping mining of two coal seams in Yongdingzhuang Mine, Datong Mining Area, this paper utilizes finite element numerical simulation software to study the wind leakage characteristics of the 8106 working face and the distribution range of the spontaneous combustion "three zones" of the mining area. The results show that, under the condition of external air leakage, the internal pressure of the goaf is greater than the external pressure, the upper pressure is greater than the lower pressure, and the seepage direction is from the top down and from the inside out. Under the condition of no external air leakage, the air leakage source is mainly concentrated in the air inlet lane.

Microstructure and Properties of Hollow Octet Nickel Lattice Materials.

In this study, electroless nickel plating and electrodeposition were used to deposit thin films on the polymer lattice template prepared by 3D printing, then seven Octet hollow nickel lattice materials with different structural parameters were synthesized by etching process at the expense of the polymer backbone. The microstructure and properties of the Octet structure nickel lattice were characterized by X-ray diffraction, Electron backscattering diffraction and transmission electron microscopy. According to the results, the average grain size of the electrodeposition Ni lattice material was 429 nm, and (001) weak texture was found along the direction of the film deposition.

Mechanical Properties and Constitutive Model of the Cement-Improved Loess under Freeze-Thaw Conditions.

Cement-improved loess (CIL) is used as a common filler for subgrade construction projects in loess areas. The freeze-thaw (F-T) conditions have a significant effect on the stability of cement-improved loess subgrades in seasonally frozen regions. In this paper, the CIL samples, experiencing different numbers of F-T cycles at varying freezing temperatures, were used in consolidated undrained triaxial compression tests to investigate the effect of F-T conditions on the mechanical properties of CIL.

Prognostic Significance of Membranous Carbonic Anhydrase IX Expression in Patients with Nonmetastatic Clear Cell Renal Cell Carcinoma of Different Tumor Stages.

There are paradoxical results regarding whether carbonic anhydrase IX (CAIX) is a prognostic biomarker for patients with clear cell renal cell carcinoma (ccRCC). The objective of this study was to evaluate prognostic significance of CAIX in nonmetastatic ccRCC patients of different stages. This is a retrospective study on 1263 patients with nonmetastatic ccRCC from January 2005 to June 2018.

Mental Health Outcomes in Perinatal Women During the Remission Phase of COVID-19 in China.

Background: Since the middle of March, the COVID-19 outbreak has been well contained in China. The prevention and control measures for the outbreak have been downgraded to a normalized level. However, until now, the change in level of psychological health amongst perinatal women during the remission phase of the COVID-19 outbreak has not been investigated in China.

Highly transparent TiO nanowires as charge-balancing layers for assembling electrochromic devices: effect of thickness on electrode potentials and electrochromic performance.

TiO nanowires with high transparency and good ion storage capacity were explored as the charge-balancing layers for assembling electrochromic devices (ECDs). Increase thickness of TiO nanowires layer lowers the driving potential of the entire ECDs accompanied with reduced potential at the EC layer electrode, which further leads to decreased optical contrast and switching speed of the ECDs. Meanwhile, it can be found that the EC layer electrodes possess larger charge densities than those of TiO nanowire electrodes during the electrochemical redox process of these ECDs.

All solid state electrochromic devices based on the LiF electrolyte.

The unsafe deposition process and slow deposition rate of the electrolyte layers are the main obstacles for electrochromic devices (ECDs) toward commercial application. In this work, an ECD with a structure of glass/ITO/WO/LiF/NiO/ITO has been prepared by electron beam and resistance evaporation methods. The LiF electrolyte is deposited by resistance evaporation with the LiF particles and shows promising potential as the Li based electrolyte in ECDs owing to its high transparency and good ionic conductivity.

Self-Perceived Pain in Chinese Patients With Cancer.

Background: Pain is one of the most burdensome and prevalent symptoms cancer patient report and it has severe negative impact on patient's quality of life. The aim of this study is to estimate the prevalence of pain and to test the association between demographic, clinical, psychological factors, and self-assessed pain in Chinese cancer population.

Methods: A total of 553 cancer patients were recruited in this cross-sectional study.

Effectiveness of pre-operative clown intervention on psychological distress: A systematic review and meta-analysis.

Aim: This study aims to provide an overview of the current knowledge available on the effectiveness of pre-operative clown intervention on psychological distress in children and parents.

Methods: PubMed, MEDLINE, Embase and PsycINFO databases were searched to identify relevant studies. Systematic review procedures were followed including a quality assessment.

2-Methoxyestradiol prevents monocyte adhesion to vascular endothelial cells via downregulation of VCAM-1 expression.

2-Methoxyestradiol (2-ME) reduces atherosclerotic lesion formation. However, the underlying mechanisms remain largely unknown. In this work, we investigated the effect of 2-ME on monocyte adhesion to vascular endothelial cells.

2-methoxyestradiol induces vasodilation by stimulating NO release via PPARγ/PI3K/Akt pathway.

The endogenous estradiol metabolite 2-methoxyestradiol (2-ME) reduces atherosclerotic lesion formation, while the underlying mechanisms remain obscure. In this work, we investigated the vasodilatory effect of 2-ME and the role of nitric oxide (NO) involved. In vivo studies using noninvasive tail-cuff methods showed that 2-ME decreased blood pressure in Sprague Dawley rats.

Complete genome sequence of Staphylococcus aureus T0131, an ST239-MRSA-SCCmec type III clone isolated in China.

We report here the complete genome sequence of Staphylococcus aureus T0131, which is a multiresistant clinical isolate recovered in China and the first sequenced epidemic ST239-MRSA-SCCmec type III strain obtained in Asia. Comparison with two published genomes of ST239 reveals the polymorphism among strains of this type from different continents.

[Effect of epidural anesthesia on hemorheology in patients undergoing gynecological laparoscopy].

Objective: To evaluate the effect of epidural anesthesia and patient-controlled epidural analgesia (PCEA) on hemorheology and the incidence of deep venous thrombosis in patients undergoing gynecological laparoscopy.

Methods: One hundred ASA I-II patients undergoing gynecological laparoscopy were randomly allocated into 2 groups to receive general-epidural anesthesia combined with PCEA (GE group) and general anesthesia (G group). Blood samples were taken before anesthesia (T(0)), before operation (T(1)), 30 min after pneumoperitoneum (T(2)), 30 min after pneumoperitoneum cease (T(3)), and 24 and 48 h after the operation (T(4), T(5)) for hemorheological tests.

[Effect of intrathecal administration of sufentanil at different doses on bupivacaine spinal anesthesia in gynecologic laparoscopy].

Objective: To investigate the effect of sufentanil administered intrathecally at different doses on the clinical effect of bupivacaine spinal anesthesia in gynecologic laparoscopy.

Methods: Sixty patients with ectopic pregnancy undergoing elective laparoscopy (ASA class I-II) were randomized into 4 groups (groups A, B, C and D), and received spinal anesthesia with 15 mg bupivacaine and sufentanil at 0, 2.5, 5 and 7.

[Application of flurbiprofen preemptive analgesia combined with intravenous propofol anesthesia in induced abortion].

Objective: To investigate the effect of flurbiprofen preemptive analgesia combined with intravenous propofol anesthesia in induced abortion.

Methods: Totally 175 women (ASA class I) undergoing induced abortion were randomized into 5 groups. In K10, K5, and K1 groups, the patients were given 50 mg flurbiprofen 10, 5 and 1 min before the operation, respectively, and in F group, 1 microg/kg of fentanyl was administered 10 min before the operation.

[Comparison of levobupivacaine, ropivacaine and racemic bupivacaine in patient-controlled epidural analgesia after cesarean section].

Objective: To compare efficacy and side effects of patient-controlled epidural analgesia (PCEA) with levobupivacaine, ropivacaine and racemic bupivacaine after cesarean section.

Methods: In this prospective, randomized double-blind study, 90 ASA I-II full-term nulliparous women (aged 25-38 years with body weight of 59-87 kg) undergoing elective cesarean section under spinal-epidural anesthesia equally allocated into 3 groups. PCEA was administered with 0.

[Platysma myocutaneous flaps in reconstruction of oral defect caused by tumor resection].

Objective: To study the method and feasibility of platysma myocutaneous flap in reconstruction of oral defects.

Methods: From March 2003 to June 2004, 15 patients with defects of tongue, floor of mouth, bucca, lateral pharynx and soft palate were treated with platysma myocutaneous flaps. There were 12 males and 3 females with an age range of 41-77 years.