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Open access

Bo Li and Na Ma

Integrability Formulas. Part III

In this article, we give several differentiation and integrability formulas of composite trigonometric function.

Open access

Bo Li and Na Ma

Integrability Formulas. Part I

In this article, we give several differentiation and integrability formulas of special and composite functions including the trigonometric function, and the polynomial function.

Open access

Hong Li, Na Li and Li-Li Chen

Abstract

Background: The role of nursing in the management of chest drains is diverse and important. There is a paucity of data regarding the management of chest drains by nurses.

Objective: To establish an evaluation system for nurses to help guide the care of patients being treated with closed thoracic drainage tubes.

Methods: An ADC (availability, dependability, and capacity) model was used as the framework to evaluate treatment guidelines. A questionnaire was developed and tested for reliability and validity based on experimental models of thoracic drainage. Patients were subsequently randomly selected and screened using the effectiveness assessment form.

Results: Overall dimension scores and subgroups were correlated (r > 0.7). Test-retest reliability met required standards (r = 0.769-0.889, p < 0.01). The correlation coefficient between scores of each dimension and total score was 0.542 to 0.920, and correlation coefficients for each item and its dimension were 0.429 to 0.887.

Conclusions: The proposed assessment form provides an evidence-based tool for nurses to effectively manage patients with closed thoracic drainage systems. Experimental and clinical measures confirm the tool’s reliability and validity.

Open access

Bo Li, Na Ma and Xiquan Liang

Integrability Formulas. Part II

In this article, we give several differentiation and integrability formulas of special and composite functions including trigonometric function, and polynomial function.

Open access

Jin-qian Zhang, Li-cheng Zhang, Na Ren, Ming Zhang, Li-min Guo, Xing-wang Li and Jun Cheng

Abstract

Objective Patients with H1N1 virus infection were hospitalized and quarantined, and some of them developed into acute respiratory failure, and were transfered to the medical intensive care unit of Beijing Ditan Hospital, Capital Medical University in Beijing, China.

Methods The clinical features and preliminary epidemiologic findings among 30 patients with confirmed H1N1 virus infection who developed into acute respiratory failure for ventilatory support were investigated.

Results A total of 30 patients (37.43 ± 18.80 years old) with 2009 influenza A (H1N1) related acute respiratory distress syndrome (ARDS) received treatment with mechanical ventilation, 15 cases of whom were male and 17 cases died of ARDS. Fatal cases were significantly associated with an APACHE Ⅱ score (P = 0.016), but not with PaO2/FIO2 (P = 0.912) and chest radiograph (P = 0.333). The most common complication was acute renal failure (n = 9). Five patients received extracorporeal membrane oxygenation (ECMO), 3 of whom died and the others survived. The major causes of death were multiple organ dysfunction syndrome (MODS) (39%), intractable respiratory failure (27%) and sepsis (20%).

Conclusions Most patients with respiratory failure due to influenza A (H1N1) virus infection were young, with a high mortality, particularly associated with APACHE ∥ score, secondary infection of lung or type 2 diabetes mellitus.

Open access

Yi-Ming Zhang, Dong-Xu Yu, Bai-Shuang Yin, Xin-Ran Li, Li-Na Li, Ya-Nan Li, Yu-Xin Wang, Yu Chen, Wen-Han Liu and Li Gao

Abstract

Introduction: Xylazine, a type of α2-adrenoceptors, is a commonly used drug in veterinary medicine. Xylazine-induced changes in the content of amino acid neurotransmitters – glycine (Gly) and aspartic acid (Asp), in different brain regions and neurons were studied.

Material and Methods: Wistar rats were administered 50 mg/kg or 70 mg/kg of xylazine by intraperitoneal injection. In addition, in vitro experiments were conducted, in which neurons were treated with 15 μg/mL, 25 μg/mL, 35 μg/mL, and 45 μg/mL of xylazine. Test methods were based on the enzyme-linked immunosorbent assays (ELISA).

Results: During anaesthesia, Asp levels in each brain area were significantly lower compared to the control group. Except for the cerebrum, levels of Gly in other brain areas were significantly increased during the anaesthesia period. In vitro, xylazine-related neuron secretion of Gly increased significantly compared to the control group at 60 min and 90 min. Moreover, xylazine caused a significant decrease in the levels of Asp secreted by neurons at 20 min, but gradually returned to the level of the control group.

Conclusion: The data showed that during anaesthesia the overall levels of Asp decreased and overall levels of Gly increased. In addition, the inhibitory effect of xylazine on Asp and the promotion of Gly were dose-dependent. Our data showed that different effects of xylazine on excitatory and inhibitory neurotransmitters provided a theoretical basis for the mechanism of xylazine activity in clinical anaesthesia.

Open access

Xiaohui Lu, Wei Li, Xianwen Lu, Mingjiang Jin, Na Min and Xuejun Jin

Abstract

This study presents mechanical spectroscopy of bearing steel subjected to different heat treatments. A non-thermally activated maximum, P1, was found at 130°C, in quenched martensitic samples, which were austenitized at 1050°C and 860°C, and presented twin martensite microstructures. It is suggested that the mechanism of the P1 maximum, observed on the low-temperature side of Snoek-Köster peak, is related to the change of defect configurations in twinned martensite assisted with high mobility of the solute carbon atoms under an external harmonic stress field applied during mechanical loss measurements.

Open access

Na Li, Jiquan Yang, Aiqing Guo, Yijian Liu and Hai Liu

Abstract

The aim of this paper is to address the surface reconstruction from point cloud in reverser engineering. The data was acquired through a 3D scan device and was processed as point cloud data. The points in cloud were connected to build 3D surface. The points cloud was processed in four steps to get 3D information surface. First, the subtraction scheme was used to get cover boxes ended with the set of convex was found under the convergence rule. Secondly, the points in the box were projected to the directions which were close to the normal direction method. Thirdly the overlap was avoided by using convergence rule and inner subdivision rule. Finally the information model was used to reconstruction. The method was used in landslide monitoring of Three Gorges area for 3D surface reconstruction and monitoring. The reconstruction method obtains high precision and low complexity. It is effective for large scale monitoring.

Open access

Chao Meng, Na Li, Zhaoxiao Tong, Huangxin Yan and Shenxiao Min

Abstract

Viral hepatitis C is one of the most prevalent infectious diseases in the world and may cause serious hepatic diseases in the future. Hepatitis C-infected people account for approximately 2% to 3% of the world’s population. The main causes of hepatitis C infection in developing countries are unsafe medical injection and contaminated blood and blood products; whereas in developed countries, it is mainly caused by injection, drug abuse, and high-risk sexual behavior. The focus of hepatitis C prevention and control should be placed on safer blood supply, safer health care and related unnecessary injection, reduction of injection drug use, and high-risk sexual behavior because effective vaccine and postexposure prophylaxis are not yet available.

Open access

Wei Wang, Na Li, Fang Zhang, Aizhao Zhou and Snow Chi

Abstract

In order to properly understand the effect of freezing-thawing circle (FTC) to mechanical behavior of costal soft soil (CSS), unconfined compressive test is conducted. Six kind FTC times are designed from zero to five. The tested data show that: (1) unconfined compressive strength of CCS decreases nonlinearly with more FTC, and the strength after five FTC times becomes about 22% of its original strength without any freezing-thawing experience; (2) stress-strain curves of all unconfined compressive samples can be well fitted by three-parameter hyperbolic model; (3) and relationship between two parameters and FTC times can be fitted by exponent function, while another parameter can be considered as 0.95. Consequently, one composite hyperbolic- exponent empirical formula is established in order to describe freezing-thawing-dependent stress-strain behavior of CSS. Finally, good agreements have been found between tested data and simulated results.