Search

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng is the property of Journal of Engineering for Thermal Energy & Power and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Tropical Medicine is the property of China Tropical Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to explore the failure mechanism of standard sand-steel plate interaction and analyze the stress and deformation of the contact surface, the monotonic shear test of standard sand-steel plate was carried out by using a special semi-mold direct shear apparatus with an observation window. The stress and deformation characteristics were studied, and the microscopic analysis was carried out by using MiVnt and PFC2D. The test results showed that the shear stress-displacement curve of the standard sand-steel plate contact surface exhibits work hardening, which can be regarded as an ideal elastoplastic model. The curve is divided into three stages: linear growth, slow growth and horizontal development. The change law of the porosity of the contact zone during the shearing process is consistent with the change law of the pore size. During the monotonic shear process, the motion state of the particles on the contact surface is divided into three categories, corresponding to the three stages of the shear stress-displacement curve. The contact surface transmits the shear stress through the movement of the particles. [ABSTRACT FROM AUTHOR]

Objective To investigate the effects of hydrogen charging on the hydrogen damage behavior of tubes in sour gas environment, the tensile mechanical properties of three high-strength steels before and after hydrogen charging should be evaluated. Methods The hydrogen damage behavior of the three high-strength steels was investigated by electrochemical hydrogen charging experiments, MTS tensile testing and fracture microscopic morphological analysis. Results The results showed that the tensile mechanical properties of the three steels were significantly reduced after hydrogen charging, indicating that plastic damage occurred in all three steels, and the greater the strength of the steel, the greater the reduction; and the stronger the hydrogen embrittlement of material, the lower the hydrogen damage resistance of material. Conclusion The hydrogen damage evaluation method for high-strength steel used in this article can provide a technical reference for evaluating the suitability of oil well pipes in sour gas environment. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Ophthalmology & Otorhinolaryngology is the property of Eye & ENT Hospital of Fudan University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To explore mechanic texture of sand landslide, a centrifuge modelling test device for rainfall induced landslide was developed to carry out coarse sand centrifuge model test. Based on the test results, the improved discrete element numerical simulation program was used to study the meso scale process of landslide, and the centrifuge model test was supplemented from the perspective of meso scale and discontinuity. The results show that: the meso mechanism of coarse sand landslide is that the water in the slope cannot be discharged in time, resulting in the soil particles suspended in the water particles, the contact between the soil particles is reduced or even separated, the interaction between the soil particles is transformed into the interaction between the soil particles and the water particles, the fluid characteristics of the soil appear, and the shear strength is lost. There are two possible forms of landslide development: the force exerted by the water particles on the soil particles is exactly equal to the contact force of the soil particles at this position, which shows the overall sliding. The force exerted by the water particles on the soil particles is equal to the sum of the gravity of the soil particles and the contact force of the front soil particles, which shows that the rear landslide develops forward. [ABSTRACT FROM AUTHOR]

Copyright of Forest Research is the property of Forest Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oncology is the property of Chinese Journal of Oncology / Zhonghua Zhongliu Zazhi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China Medical University is the property of Journal of China Medical University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rare Metal Materials & Engineering is the property of Northwest Institute for Nonferrous Metal Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To investigate the dynamic expressions of nerve growth factor (NGF). And its tyrosinekinase A (TrkA ) receptor in lung tissue of rats with cerebral ischemia. Methods: Thirty two adult male SD rats were randomly divided into four groups using a random number table ( n = 8each): Sham-operated group, Cerebral ischemia group (6 h, 24 h, 48 h). We established a rat model of cerebral ischemia by permanent middle cerebral artery occlusion (pMCAO). At different time points after pMCAO, the rats were sacrificed and lung tisues were excised for analysis of wet/dry (W/D) weight ratio and HE examination. A t the same time, the expression of NGF and TrkA in lung tissues were detected by Western Blot analysis.Results: Compared with sham-operated group, W/D of lung tissue increased significantly at 24h and 48h after cerebral ischemia (P < 0.05), especially in 24 h group (P < 0.01). Mild hyperemia, edema and inflammatory changes were observed in lung tissue at 6 hours after cerebral ischemia. While the destruction of alveolar structure was obvious at 24 and 48 hours after cerebral ischemia. The pathological score of lung tissues in 24 and 48 hours was significantly higher than that in sham-operated group (P<0.05). Interestingly, the expression of NGF in lung tissue increased at 24 h after cerebral ischemia (P < 0.05), but decreased at 48h, which still higher than that in sham-operated group (P < 0.05); TrkA began to decrease at 6 h after cerebral ischemia (P > 0.05), decreased significantly at 24 h (P < 0.05), and increased at 48 h, but still significantly lower than that in sham-operated group (P <0.05). Conclusions: The dynamic changes of NGF/TrkA in rat lung tissue may be involved in the pathophysiological process of lung injury after cerebral ischemia. [ABSTRACT FROM AUTHOR]

Copyright of China Petroleum Machinery is the property of China Petroleum Machinery Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To investigate the association of lipid profiles and triglyceride-glucose (TyG) index at the first visit with the risk of gestational diabetes mellitus (GDM). Methods Between June 2014 and February 2018, a total of 545 pregnant women were divided into normal glucose tolerance (NGT, n=157) and GDM (n=388) according to 75 g oral glucose tolerance test. The characteristic and metabolic indexes, such as TyGindex, triglyceride (TG), high density lipoprotein-cholesterol (HDL-C), were comparedusing Student's t -test or Mann-Whitney U test. Logistic regression was used to analyze the risk factors of GDM during pregnancy. Receiver operating characteristic curve predicted the threshold of each indicator affecting the occurrence of GDM. Results The results showed that the level of TG [2.09 (1.44, 2.94) vs 1.47 (1.02, 2.64) mmol/L, Z=-2.169, P=0.030], TyG index [1.75 (1.38, 2.13) vs 1.16 (0.84, 1.70), Z=-3.910, P<0.001], and TG/HDL-C [1.30 (0.86, 1.74) vs 0.96(0.71, 1.44), Z=-2.283, P=0.022] in GDM were significantly higher than NGT. Maternal age, pre-gestational weight, pre-gestational maximum weight, pre-gestational body mass index, proportion of overweight and obesity, prenatal weight, first-degree relatives family history of diabetes, acanthosis, and the incidence of previous adverse pregnancy outcomes were also higher in GDM (P<0.05). Adjusted confounding factors, TyG index [odds ratio (OR)=24.138, 95% confidence interval (CI) 4.167- 139.862, P<0.001] was a risk factor for GDM. With the increase of TyG index, the risk of GDM increased significantly (P<0.05). ROC curves showed that the cut-off values of TyG index and TG were 1.38 [sensitivity 75.5% and specificity 65.6%; area under the curve (AUC) 0.730, 95% CI: 0.632-0.827, P<0.001], and 51.59 mmol / L (sensitivity 72.6% and specificity 54.3%; AUC 0.623, 95%CI: 0.513 - 0.732, P=0.056), respectively. Conclusion Pregnant women with TyG index>1.38 is prone to occur GDM during pregnancy. [ABSTRACT FROM AUTHOR]

Copyright of CT Theory & Applications is the property of Editorial Department of CT Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nankai Journal: Philosophy, Literature & Social Science Edition / Nankai Xuebao: Zhexue Shehui Kezue Ban is the property of Nankai Xuebao Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Diabetes Mellitus is the property of Chinese Journal of Diabetes Mellitus and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To explore the correlation between the silent information regulator factor 2 related enzyme 1 (SIRT1) protein expression in peripheral blood mononuclear cells（PBMCs）and exacerbation risk in patients with chronic obstructive pulmonary disease(COPD). Method: Thirty COPD patients recruited from our hospital during May 2014 to May 2015 were divided into COPD low risk group and COPD high risk group. Each group contained 15 patients. The control group contained 20 healthy no-smoking subjects. The SIRT1 protein expression in PBMCs was measured with Western blot method. Result: Compared with control group (0.75± 0.06) , the SIRT1 protein expression was significantly reduced in PBMCs of low risk COPD patients (0.49± 0.09, P＜0.05）. Compared with COPD low risk group, the SIRT1 protein expression was also obviously decreased in PBMCs of high risk COPD patients (0.28± 0.09, P＜0.05）. Pearson line correlation revealed that the SIRT1 protein was positively correlated with FEV1%predicted value（r=0.757, P＜ 0.05）and negatively correlated with the exacerbation frequency（r=-0.776, P＜0.05）. Conclusion: The protein expression of SIRT1 in PBMCs in COPD patients is obviously decreased, which is closely correlatd with exacerbation frequency. [ABSTRACT FROM AUTHOR]

Copyright of Hydrographic Surveying & Charting / Haiyang Cehui is the property of Hydrographic Surveying & Charting Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Direct time delay (DTD) compensation is an effective method for beamforming of ultra-wideband (UWB) signal. The digital beam-forming (DBF) performance is directly related to the frequency response of the DTD filter. Based on the analysis of problems existing in Lagrange interpolation filter, a novel method utilizing interpolation filter sets with fixed coefficients is presented to implement DBF. High-order Hermite interpolation filter sets with simple structure combing multi-channel up-sampling technology are applied to DTD and the DBF of UWB signals is achieved by multi-channel delay compensation- Theoretical analysis and simulation results show that the proposed method is featured by a more ac_ curate recovery of UWB signals when sampling rate is less than the Nyquist rate. It has a better real-time and an obviously superior DBF performance compared to the traditional methods such as Lagrange. [ABSTRACT FROM AUTHOR]

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)