Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2024-05-14 Cooperative journals: 《中国全科医学》
Abstract： Background The pan-immune inflammatory value (PIV) and systemic immune-inflammatory index (SII) are considered novel inflammatory markers for assessing the risk of atherosclerotic cardiovascular diseases. However, few studies have confirmed the impact of PIV and SII on atherosclerotic plaques.
Objective To explore the relationship between PIV, SII, and vulnerable atherosclerotic plaques in patients with acute coronary syndrome (ACS) using optical coherence tomography (OCT) .
Methods This retrospective study included 525 ACS patients treated at the Second Affiliated Hospital of Zhengzhou University from December 2020 to June 2023. All patients underwent coronary angiography and OCT imaging. Patients were further categorized into low PIV (<337.86, 79 cases) and high PIV (≥337.86, 139 cases) groups based on the optimal PIV cutoff value, as well as into low SII (<775.63, 74 cases) and high SII (≥775.63, 144 cases) groups based on the optimal SII cutoff value. Data were collected and analyzed. Multifactorial ordinal Logistic regression analysis was used to explore the influencing factors of TCFA. Receiver operating characteristic (ROC) curves were plotted for PIV and SII in diagnosing TCFA, and the area under the curve (AUC) was calculated. Based on the diagnostic criteria for thin-cap fibroatheroma (TCFA), patients were divided into a non-TCFA group (112 cases) and a TCFA group (106 cases) .
Results The TCFA group had higher proportions of hypertension, diabetes, pan-PIV, SII, C-reactive protein (CRP), smoking history, and preoperative systolic pressure compared to the non-TCFA group (P<0.05). Multifactorial Logistic regression analysis showed that PIV (OR=1.015, 95%CI=1.010-1.020, P<0.001) and SII (OR=1.005, 95%CI=1.003-1.007, P<0.001) were risk factors for TCFA. ROC curve results indicated that the AUCs for PIV and SII in diagnosing TCFA were 0.785 (95%CI=0.725-0.845, P<0.001) and 0.707 (95%CI=0.639-0.776, P<0.001), respectively. The high PIV group showed higher rates of macrophage infiltration, punctate calcification, and vulnerable plaques than the low PIV group (P<0.05). The high SII group showed higher rates of macrophage infiltration, microchannels, and vulnerable plaques than the low SII group (P<0.05). The high PIV group had thinner fibrous caps, larger maximum lipid core angle, average lipid core angle, lipid core length, and lipid index compared to the low PIV group (P<0.05), and the high SII group had thinner fibrous caps, larger maximum lipid core angle, average lipid core angle, lipid core length, and lipid index compared to the low SII group (P<0.05) .
Conclusion High levels of PIV and SII may be associated with the incidence of vulnerable plaques in patients with ACS. PIV and SII levels have potential value in assessing the characteristics and vulnerability of coronary atherosclerotic plaques in ACS patients.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：【目的】为了深入了解中国图书出版中心的形成及传播方式。【方法】文章采用文献资料法，分析了中国图书产生的历史背景及基本特点和中国图书出版传播中心的形成规律，对中国图书出版传播形成的西安、北京、扬州、苏州、上海、南京、广州等主要中心城市进行了总结，并对其传播方式进行了分析。【结果】中国图书出版中心的形成具有很深的历史背景，在中华历史文化传承中逐步形成了中心城市，并在皇家图书收集、整理、出版、借阅，个人藏书家收藏、借阅、传抄、刻印，书院、家塾刻本与社团个人自费出版发行，现代出版社出版发行图书，图书网站及网店等历史长河中进行传播，逐步形成了现在的图书出版传播方式。【结论】以上研究使人们对中国图书传播的方式有了全新的认识，从而更好地推动中国图书出版的传播，发扬传统文化，促进经济发展。
Subjects: Library Science，Information Science >> Library Science submitted time 2023-08-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] In this paper, the present situation of the development of digital literacy in the United States is combed in order to trigger the reflection on digital literacy education in China and put forward the corresponding strategy and suggestions.[Method/process] The analysis of American websites, educational resources, government bills and industry projects of digital literacy shows that with the support of government departments, the development of action plans by industry associations, and the status of various types of libraries performing their own functions, the US digital literacy education is characterized by socialization and popularization, with the digital and public methods emphasizing on fair access, privacy protection and data security. [Result/conclusion] By learning from their experiences,our education department and libraries should follow the rapid development of our Internet industry to develop a framework, standards and long term action plans while appealing for government supports which play a key role in our digital literacy education and develop people's digital literacy.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Flower-like nanostructured SnS2 was synthesized by polyethylene glycol octylphenol ether (Triton X-100)-assisted hydrothermal method, the effect of the amount of surfactant Triton X-100 on the ingredient, morphology and electrochemical properties of the synthesized product was studied. Results show that the product is single- phase SnS2 with crystal structure of hexagonal CdI2. The Triton X-100 plays a dominative role in controlling the morphology of SnS2. With a dosage of 0.5 mL Triton X-100 the synthesized SnS2 possesses the highest degree of crystallinity with a fully flower-like morphology . A rechargeable Li-ion batteries with the as-prepared flowerlike nanostructured SnS2 as anode exhibits excellent electrochemical performance with high initial discharge specific capacity 1598 mAh穏- 1 and reversible capacity 656 mAh穏-1 respectively, in a voltage range of 0.01-1.2 V and a rate of 0.15C. After 50 cycles with a rate of 0.15C, the specific capacities retain 572 mAh穏-1 and capacity retention rate can reach 87.2%.
Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-02-27 Cooperative journals: 《干旱区地理》
Abstract： Drought is the main environmental stressor to crop growth and development and a pivotal natural constraint to high agricultural yield and harvest. Agricultural drought monitoring is typically based on meteorological observations, which, to some extent, cannot reflect the agricultural drought conditions on a regional scale. Taking the Gansu Province of China as the study area, the compositive meteorological drought index (CMDI) was constructed using a random forest regression model and the spatiotemporal pattern and change rule of drought during the crop-growing season (April to September) from 2011 to 2019 in the Gansu Province were analyzed based on MODIS, TRMM, ESA CCI, and other remote sensing data products as well as meteorological station data. The results are as follows: (1) the coefficient of determination (R2 ) of the CMDI and the measured value were all greater than 0.634 in each month; the CMDI has a high spatial correlation with the standardized precipitation evapotranspiration index, showing that the CMDI can reflect the occurrence and development of agricultural drought. (2) The agricultural drought in the Gansu Province exhibited an obvious pattern of regional differentiation, with the drought degree gradually increasing from southeast to northwest. Most parts of the Hexi region were in special and severe drought, the Longzhong region was in severe (medium) drought, and the Longdong, Longnan, and Gannan regions were in fluctuating drought. (3) From 2011 to 2019, the agricultural drought in the Gansu Province exhibited a significant fluctuating trend on both annual and monthly scales, and the drought degree was most moderate in 2012 and most severe in 2017. Agricultural drought has been reduced in the Gannan region in April-September, most areas in April and June, the Longdong region in May, and the Longnan region in September. However, the remaining regions experienced an increasing trend of drought during the crop-growing season from 2011 to 2019
Subjects: Astronomy >> Astrophysical processes submitted time 2019-11-13 Cooperative journals: 《天文研究与技术》
Abstract： 空间VLBI由于基线更长，在相同观测频率下，可获得比地基VLBI更高的分辨率。我国正在推进空间VLBI科学与技术研究。俄罗斯RadioAstron空间VLBI项目于2018年结束，其成功经验可资借鉴。该项目采用不同于常规地面VLBI的专用数据格式RDF（RadioAstron Data Format）记录观测数据，利用配备的星载或地面上行氢原子频标提供频率基准，数据经采集量化后传输至地面站，打上时标并记录于硬盘。为处理RadioAstron数据，本文分析了RDF格式，完成了RDF数据解码及VLBI相关处理，然后对比分析了Mark5B、VDIF等地面VLBI通用数据格式和RDF格式的特点。这些工作将为我国未来空间VLBI数据格式设计与处理积累经验。
Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：本研究旨在研究甜菜碱和L-肉碱对蒙寒杂交羊生长性能、屠宰性能、器官发育及脂肪沉积的影响。试验采用单因素试验设计，选取体重为（29.0±0.4） kg的蒙寒杂交羊270只，随机分为3组，每组3个重复，每个重复30只羊。对照组（CON组）饲喂基础饲粮，甜菜碱组（BN组）和L-肉碱组（L-CN组）分别在基础饲粮中添加1‰甜菜碱和0.4‰ L-肉碱。预试期15 d，正试期40 d。结果表明：1）L-CN组平均日采食量显著低于CON组和BN组（P0.05）。2）各组之间宰前活重、胴体重、屠宰率、眼积面积以及胴体脂肪含量值均无显著性差异（P>0.05）。3）各组之间内脏器官发育指标均无显著性差异（P>0.05）。4）L-CN组大肠重量及其所占宰前活重比例显著低于CON组（P0.05）。5）BN组和L-CN组总脂肪重量及其占宰前活重比例均显著低于CON组（P0.05）。由此可见，饲粮添加甜菜碱和L-肉碱均降低了蒙寒杂交羊的脂肪沉积量，而且主要降低了尾部脂肪的重量，提示我们甜菜碱和L-肉碱对蒙寒杂交羊降低体脂有一定的作用。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-20 Cooperative journals: 《计算机应用研究》
Abstract： In order to take into account the fidelity and computational efficiency of cloth simulation, this paper presented a construction method of multi-resolution cloth based on low-resolution cloth sampling. Firstly, through sampling a simulation example of low-resolution cloth movement several times, this paper obtained the average deformation degree, which represented by the average deformation degree of the vertex and the edge collision mark. Then, according to the results of sampling, it divided the region of low-resolution into high deformation area, middle deformation area and low deformation area. Next, it used the improved adaptive subdivision algorithm to refine the three deformation areas in different extent, so as to construct the multi-resolution geometric model. Finally, through the definition of the mass and the spring coefficient of the cloth, it obtained the multi-resolution physical model. This paper reduces multi-resolution grid number and improves computational efficiency relative to the high-resolution grid. It also improves the fidelity of cloth simulation compare to the low-resolution grid.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-20 Cooperative journals: 《计算机应用研究》
Abstract： To realize the rapid collision detection between cloth and human body in cloth simulation, a collision detection method based on ellipsoid fitting is proposed. Firstly, the geometric distance isoline was used as the basic data. And the model feature points was extracted by combining the linear relationship between body size and height with the structural features of the human body, which realized the semantic segmentation of the model. Secondly, the average of the radial distance was used to represent the fitting error between an ellipsoid and the model. And the number of cluster centers was gradually increased by bisecting K-means clustering algorithm based on pruning optimization. It could realize the rapid clustering of human model and generate a series of minimum ellipsoids. Finally, cloth grid points was detected with the ellipsoids instead of the model. Simulation experiments show that this method not only realizes the fast fitting of the human model, but also effectively improves the computational efficiency of collision detection.
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究丁酸梭菌（Clostridium butyricum）对罗斯308肉鸡生长性能、抗氧化能力、免疫功能和血清生化指标的影响。将540羽1日龄健康罗斯308肉鸡随机分为3组，每组6个重复，每个重复30羽。试验分对照组，饲喂不含抗生素的基础饲粮；抗生素组，在基础饲粮中添加10 mg/kg硫酸粘杆菌素和50 mg/kg杆菌肽锌；丁酸梭菌组，在基础饲粮中添加3×108 CFU/kg丁酸梭菌。试验期42 d。结果表明：1）与对照组相比，丁酸梭菌组和抗生素组肉鸡体重、平均日增重和平均日采食量均显著提高（P0.05）和47.62%（P<0.05）。4）与对照组相比，丁酸梭菌组肉鸡血清总蛋白（TP）含量显著升高（P<0.05），且在21和42日龄时，TP含量分别比抗生素组提高31.33%（P<0.05）和52.27%（P<0.05）。与对照组相比，丁酸梭菌组21和42日龄肉鸡血氨含量显著降低（P<0.05）。由此可见，饲粮中添加丁酸梭菌能够提高肉鸡血清抗氧化能力并增强机体免疫功能，促进蛋白质代谢，进而改善肉鸡的生长性能，且添加丁酸梭菌能减少肉鸡氨排放。
Subjects: Astronomy >> Astrophysical processes submitted time 2017-09-26 Cooperative journals: 《天文研究与技术》
Abstract：为研究VLBI对探测器的数据处理方法并评估其处理能力，现有做法需基于测站VLBI终端接收的探测器信号进行。采用信号仿真方法可以根据设计轨道与信标特点利用计算机生成需要的探测器VLBI信号，相比试验观测具有独特优势。观测试验时，测站终端接收探测器下行射频信号，通过混频变换为中频信号，再进行数字化采集数据。仿真信号时，为减少计算规模，直接构造数字中频信号，二次采样后提取通道信号，获得数字终端的VLBI仿真信号。由于探测器相对VLBI测站运动，测站接收的探测器下行信号反映目标的视向速度变化。根据探测器信号时延模型，研究了探测器点频信号和有限带宽信号多普勒效应的模拟方法。通过仿真信号与VLBI终端接收信号的对比以及对VLBI相关处理结果的分析，验证了探测器VLBI信号仿真方法的可行性，为后续仿真技术在月球与火星探测器中的VLBI测定轨应用奠定了技术基础。
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