Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《分子影像学杂志》
Abstract： Objective To explore the diagnostic value of pulmonary artery pressure value combined with right lower pulmonaryartery diameter in pulmonary heart disease. Methods Randomly selected from June 2014 to May 2016, 49 cases withpulmonary heart disease diagnosed as pulmonary heart disease group; 31 cases with chronic obstructive pulmonary diseasewere treated with the same time as the COPD group; and 30 cases of normal adults as control group. CT was used to measurethe diameter of the right lower pulmonary artery in each group, and the pulmonary artery pressure was measured byechocardiography. The indexes of each group were compared and the relationship between the indexes and the course ofpulmonary heart disease were analyzed. Results With the development of pulmonary heart disease, the diameter of the rightpulmonary artery increased, there were significant differences in the diameter of the main pulmonary artery and pulmonaryartery pressure between the control group and the pulmonary heart disease group. Pulmonary heart disease group and COPDgroup, the control group of the right lower pulmonary diameter/pulmonary artery pressure value comparison, the differencewas statistically significant. Conclusion The change of the right lower pulmonary diameter and pulmonary pressure value arerelated to the degree of the disease course of pulmonary heart disease. The value of right lower pulmonary diameter andpulmonary artery pressure value is a CT monitoring index in the diagnosis of pulmonary heart disease and its process.
Subjects: Library Science，Information Science >> Information Science submitted time 2024-04-18
Abstract： Abstract: Purpose/Significance The independent knowledge system is an integration of disciplinary system, academic system, and discourse system. The construction and refinement of China’s independent knowledge system in intelligence science is an inevitable requirement for the development of Chinese characteristic intelligence science and the needs of the times. Method/Process Academic journals serve as an important vehicle for the independent knowledge system of intelligence science in China. In this study, we selected 3173 intelligence science literature published in academic core journals between 2014 and 2023 as the subjects of observation. We conducted a thorough analysis of the academic core journals that published intelligence science articles, the themes set by these journals, and the frequency of keywords. We employed bibliometric and content analysis methods and utilized CiteSpace software for visualization observation to present the internal structure and general framework of China’s independent knowledge system in intelligence science. Result/Conclusion In the era of digital intelligence, the innovation of autonomous knowledge in Chinese intelligence studies focuses on exploring technology and emerging technologies as the guiding intelligence tools, researching intelligence work in the context of big data, studying intelligence application systems in the era of blockchain technology and artificial intelligence, and constructing disciplines of intelligence studies in this context.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2024-01-03
Abstract： A nonlinear dynamic simulation model based on coordinated control of speed and flow rate for the molten salt reactor and combined cycle systems is proposed here to ensure the coordination and stability between the molten salt reactor and power system. This model considers the impact of thermal properties of fluid variation on accuracy and has been validated with Simulink. This study reveals the capability of the control system to compensate for anomalous situations and maintain shaft stability in the event of perturbations occurring in high-temperature molten salt tank outlet parameters. Meanwhile, the control system's impact on the system's dynamic characteristics under molten salt disturbance is also analyzed. The results reveal that after the disturbance occurs, the controlled system benefits from the action of the control, and the overshoot and disturbance amplitude are positively correlated while the system power and frequency eventually return to the initial values. This simulation model provides a basis for utilizing molten salt reactors for power generation and maintaining grid stability.
Subjects: Nursing >> Nursing submitted time 2023-09-13
Abstract： This article observes the effect of ear acupoint pressure therapy on a patient with chest pain and insomnia anxiety, summarizes relevant nursing experience, and often uses ear acupoint pressure therapy in the implementation of traditional Chinese medicine characteristic treatment nursing. This treatment method usually combines routine care, dietary care, and emotional care. The nursing techniques and methods of ear acupoint pressure therapy have a direct and obvious effect, without any side effects, and improve the physical and mental state and quality of life of patients, which is the key to promoting their recovery.
Peer Review Status:Awaiting Review
Subjects: Mathematics >> Statistics and Probability submitted time 2019-07-21
Abstract： " Based on the point of view of neuroethology and cognition-psychology, general frame of theory for intelligent systems is presented by means of principle of relative entropy minimizing in this paper. Cream of the general frame of theory is to present and to prove basic principle of intelligent systems: entropy increases or decreases together with intelligence in the intelligent systems. The basic principle is of momentous theoretical significance and practical significance .From the basic principle can not only derive two kind of learning algorithms (statistical simulating annealing algorithms and annealing algorithms of mean-field theory approximation) for training large kinds of stochastic neural networks,but also can thoroughly dispel misgivings created by second law of thermodynamics on 'peoplespsychology ,hence make one be fully confident of facing life.Because of Human society, natural world, and even universe all are intelligent systems. "
Peer Review Status:Awaiting Review
Subjects: Physics >> The Physics of Elementary Particles and Fields submitted time 2017-08-24
Abstract： Kaluza-Klein photon in universal extra dimension models is one of the most attractive dark matter candidates as a weakly interacting massive particle. Having a characteristic split spectrum in split universal extra dimension the relic density of Kaluza-Klein photon with 900GeV mass is in good agreement with the observed dark matter amount in our Universe. Interestingly KaluzaKlein photon in the same mass range also provides excellent fits to the recently observed excesses in cosmic electron and positron fluxes. The amount of gamma-ray contributions, mostly from tau decays, can be significant around 300 GeV, thus can be observed or constrained by the forthcoming Fermi-LAT diffuse gamma-ray data.
Peer Review Status:Awaiting Review
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-02 Cooperative journals: 《热科学学报》
Abstract： In recent years, separating and extracting technologies of condensate gas have been developed by combining a swirl flow with non-equilibrium condensation phenomena of condensate gas generated in a supersonic flow. The technology can reduce the size of the device and does not use chemicals. However, there are many unresolved problems for performance of the separation, extraction and operating principle. Therefore it is necessary to research further in order to improve the performance of the equipment. In the present study, the numerical study was carried out to clarify the effect of the heterogeneous condensation on the characteristics of the swirling flow field in a supersonic annular nozzle, and the differences between homogeneous condensation and heterogeneous condensation in the flow field. As the results, it is found that the condensation flow with a swirl affects the position of sonic line, the generating position of condensate and the radial distribution ratio of liquid phase.
Subjects: Physics >> The Physics of Elementary Particles and Fields submitted time 2017-08-24
Abstract： We explicitly show that split-universal extra dimension (split-UED), a recently suggested extension of universal extra dimension (UED) model, can nicely explain recent anomalies in cosmic-ray positrons and electrons observed by PAMELA and ATIC/PPB-BETS. Kaluza-Klein (KK) dark matters mainly annihilate into leptons because the hadronic branching fraction is highly suppressed by large KK quark masses and the antiproton flux agrees very well with the observation where no excess is found . The flux of cosmic gamma-rays from pion decay is also highly suppressed and hardly detected in low energy region (Eγ . 20 GeV). Collider signatures of colored KK particles at the LHC, especially q1q1 production, are studied in detail. Due to the large split in masses of KK quarks and other particles, hard pT jets and missing ET are generated, which make it possible to suppress the standard model background and discover the signals.
Peer Review Status:Awaiting Review
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-02 Cooperative journals: 《热科学学报》
Abstract： The effects of different refrigerants on heat transfer performance of pulsating heat pipe (PHP) are investigated experimentally. The working temperature of pulsating heat pipe is kept in the range of 20 degrees C-50 degrees C. The startup time of the pulsating heat pipe with refrigerants can be shorter than 4 min, when heating power is in the range of 10W-100W. The startup time decreases with heating power. Thermal resistances of PHP with filling ratio 20.55% were obviously larger than those with other filling ratios. Thermal resistance of the PHP with R134a is much smaller than that with R404A and R600a. It indicates that the heat transfer ability of R134a is better. In addition, a correlation to predict thermal resistance of NIP with refrigerants was suggested.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-02 Cooperative journals: 《热科学学报》
Abstract： Numerical simulations were performed to predict the film cooling effectiveness on the fiat plate with a three-dimensional discrete-hole film cooling arrangement. The effects of basic geometrical characteristics of the holes, i.e. diameter D, length L and pitch S/D were studied. Different turbulent heat transfer models based on constant and variable turbulent Prandtl number approaches were considered. The variability of the turbulent Prandtl number Pr-t in the energy equation was assumed using an algebraic relation proposed by Kays and Crawford, or employing the Abe, Kondoh and Nagano eddy heat diffusivity closure with two differential transport equations for the temperature variance k(theta) and its destruction rate epsilon(theta). The obtained numerical results were directly compared with the data that came from an experiment based on Transient Liquid Crystal methodology. All implemented models for turbulent heat transfer performed sufficiently well for the considered case. It was confirmed, however, that the two-equation closure can give a detailed look into film cooling problems without using any time-consuming and inherently unsteady models.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-02 Cooperative journals: 《热科学学报》
Abstract： The present paper reports a comparison of experimental SPL spectral data related to the tonal noise generated by axial-flow fans. A nine blade rotor has been operated at free discharge conditions and in four geometrical configurations in which different kinds of tonal noise generating mechanisms are present: large-scale inlet turbulent structures, tip-gap flow, turbulent wakes, and rotor-stator interaction. The measurements have been taken in a hemi-anechoic chamber at constant rotational speed and, in order to vary the acoustic source strength, during low angular acceleration, linear speed ramps. In order to avoid erroneous quantitative evaluations if the acoustic propagation effects are not considered, the acoustic response functions of the different test configurations have been computed by means of the spectral decomposition method. Then, the properties of the tonal noise generating mechanisms have been studied. To this aim, the constant-Strouhal number SPL, obtained by means of measurements taken during the speed ramps, have been compared with the propagation function. Finally, the analysis of the phase of the acoustic pressure has allowed to distinguish between random and deterministic tonal noise generating mechanisms and to collect information about the presence of important propagation effects.
Subjects: Library Science，Information Science >> Library Management submitted time 2023-12-25
Abstract： This article takes the practical case of reading promotion in university libraries as a guide, and conducts design and research from four aspects: system construction, system improvement, publicity methods, and characteristic activities of reading promotion. It focuses on the integration of campus reading culture and ideological construction of university youth, continuously enriching and developing the forms and contents of traditional Chinese cultural education, establishing and improving the community system of university youth reading, constructing classroom education, academic education, social practice, and so on A campus reading culture promotion system that integrates multiple themed activities.
Peer Review Status:Awaiting Review
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-13 Cooperative journals: 《广西植物》
Abstract： In this study, the species diversity and geographical distribution pattern of wild Gesneriaceae in Guizhou Province were studied based on the establishment of a list and geographical distribution database of wild Gesneriaceae in Guizhou Province. Through the literature and a field investigation, the species composition, endemism, horizontal distribution, vertical distribution and similarity were analysed. Finally, the hotspots of Gesneriaceae in Guizhou were determined by a complementary algorithm. The results were as follows: There are 153 species (including subspecies) of Gesneriaceae in Guizhou Province, belonging to 2 tribes, 8 subtribes, and 28 genera. These plants are distributed among 75 county-level administrative districts. There are 128 species endemic to China and 45 endemic to Guizhou, and the vertical distribution is the most abundant at altitudes of 900-1 300 m. The calculation of the provincial similarity coefficient showed that Guizhou and Guangxi had the highest similarity. Finally, 10 hot spots were selected, representing 75% of the Gesneriaceae plants. Guizhou Province is a typical karst plateau mountainous area that is rich in species of Gesneriaceae, especially Oreocharis, Primulina, Petrocodon and Paraboea, which have high species diversity and regional specificity. This study can provide a theoretical reference for the conservation and sustainable utilization of Gesneriaceae plant resources in Guizhou Province.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-02 Cooperative journals: 《广西植物》
Abstract：在进行多肉植物资源调查时，在我国山东发现一仙人掌科仙人掌属新记录种——匍地仙人掌[Opuntia humifusa (Raf.) Raf.]。该种具有独特的匍匐生长习性，叶状茎深绿色，无白霜，无针状刺，花黄色，与国内分布的仙人掌属其他物种区别明显。匍地仙人掌原产于北美洲，是仙人掌科为数不多的耐寒种类之一，现归化于中国山东省日照市五莲县，系目前发现的在我国野外分布最北的仙人掌科植物。该种可能于? 20 世纪? 50 年代在国家推广中药材时期引入种植，人类活动致使其种群逐渐扩散。同时，对匍地仙人掌与江苏报道的二色仙人掌之间的分类学问题进行了论述，并对将来匍地仙人掌在我国暖温带地区合理的开发利用进行了展望。
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-02 Cooperative journals: 《广西植物》
Abstract：全缘凤尾蕨在贵州分布广泛，资源丰富，具有清热利湿，活血消肿的功效，其化学成分和生物活性研究迄今未见文献报道。该文对全缘凤尾蕨的化学成分进行研究，旨在探明该植物的物质基础、寻找相关的活性成分和先导化合物，为合理利用其资源奠定科学基础。该研究用α-tocospirone （1）、环鸦片甾烯醇（2）、(2S,3S)-pterosin C（3）、(2R,3S)-pterosin C（4）、pterosin B （5）、pterosin F（6）、α-紫罗兰酮’）、ficusol（9）、棕榈酸（β-谷甾醇（18）。所有化合物均为首次从该植物中分离得到。
Subjects: Biology >> Botany >> Applied botany submitted time 2020-04-03 Cooperative journals: 《广西植物》
Abstract：嫁接栽培是茄果类蔬菜防治土传病害和提高产量的重要措施之一。茄子野生近缘种托鲁巴姆（Solanums torvum）因综合抗性强，成为了茄子和番茄嫁接的常用优良砧木。但是，由于托鲁巴姆种子的发芽率、发芽势和发芽指数较低，苗龄较长，限制了其在工厂化育苗中的大规模应用，因此迫切需要开发其他方法及相应技术体系提高托鲁巴姆的育苗效率，降低育苗成本。本研究探索并优化了试管内微扦插繁殖托鲁巴姆技术，以无菌播种获得初代无菌苗的茎段为外植体，通过在培养基中添加植物生长调节剂，对比不同浓度植物生长调节剂对托鲁巴姆微扦插繁殖过程中的影响。结果表明托鲁巴姆在不同培养基中，腋芽诱导、继代增殖和生根培养的效果存在显著差异，初代芽诱导的最佳培养基为 MS+KT 0.5 mg·L-1+IBA 0.1 mg·L-1，出芽率达 90%；继代扦插最佳培养基为 MS+IBA 0.4 mg·L-1，培养 30 d 的增殖系数达 6.11，植株长势健壮；最佳生根培养基为 1/2MS+IBA 0.2 mg·L-1，生根培养 30 d，单株一级根数 4.56 条，最长根长 125.80 mm、根粗 0.50 mm，根系发达。采用试管内微扦插技术繁殖托鲁巴姆种苗，操作简单，增殖系数较高，可满足快速繁育种苗的要求，本研究结果为托鲁巴姆的工厂化规模育苗提供了新途径。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：以数据分析需求的视角描述了新媒体数据采集目标的设定及采集方式;在介绍以促进质量与效率为目的的新媒体数据预处理之后,以实例化方式着力阐述了矩阵分析法、相关性分析法及回归分析法为代表的统计分析和BP神经网络为代表的算法模型等经典分析方法的概念、原理及实现方法;讲述针对海量数据的大数据分析功能及基于Hadoop的KNN分类算法的应用设计,为新媒体运营企业从容应对新媒体数据分析提供了理论依据和技术支撑。
Subjects: Astronomy >> Astrophysical processes submitted time 2023-06-07 Cooperative journals: 《天文学进展》
Abstract： Deep learning for gravitational wave detection has been a hot spot in recent years. The matched filtering method can be regarded as a neural network with a single convolutional layer, and the template is stored in the convolution kernel. By increasing the depth of the model, similar detection effects can be obtained while the parameter number is greatly reduced. We study the deep learning gravitational wave detection models with different convolution kernel sizes, convolution kernel number, and convolution layer number. In addition, we investigate the detection effect of the model with batch normalization before the fully connected layer, and find that the detection accuracy of the model with a single convolutional layer increase from about 50% to more than 90% when the batch normalization is applied. A potential new method is provided for the compression of the number of matched filtering templates. By adding BN and full connection layer after matching filter, the number of matching templates may be greatly reduced. The generalization ability of the optimized CNN models on different background noise is also investigated. We find that the model trained by the data with H1 background noise can be used to detect the data with L1 background noise, but the accuracy is slightly reduced.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-02 Cooperative journals: 《热科学学报》
Abstract： Jet spreading width is one of the important characteristics of water jets discharging into the air. Many researchers have dealt with measuring this width, and contact measuring methods on the water jet surface were employed in a lot of the cases. In order to avoid undesirable effects caused by the contact on the jet surface, we introduce non-contact measuring methods with a laser instrument to the measurements of jet spreading width. In measurements, a transmitter emits sheet-like laser beam to a receiver. The water jet between the transmitter and the receiver interrupts the laser beam and makes a shadow. The minimum and maximum values of the shadow width are measured. In addition, pictures of the water jet are taken with a scale, and the shadow width is measured from the pictures. The experiments on various needle strokes were performed. Three kinds of width consistent with the jet structure were obtained. In the results, it can be concluded that our non-contact measuring methods are feasible. The data of jet spreading widths and jet taper were obtained and are useful for future applications.
Subjects: Digital Publishing >> Digital Newspaper submitted time 2023-03-24
Abstract： 随着网络技术不断发展，社交媒体也不断丰富了起来，社交媒体日益成为流行的信息传播平台，各类舆情事件在网络中层出不穷，由于互联网的匿名性与去中心化，网民可以对舆情事件、舆情当事人肆无忌惮的发表自己的想法与言语这就导致网络暴力事件的频频发生。这些由网络舆情演化而来的网络暴力事件传播速度之快、涉及领域之广、当事人受到伤害之大再次将网络暴力推向热议话题拒绝网络暴力的呼声也愈发强烈。我国在2020 年 3 月1 日正式颁布《网络信息内容生态治理规定》，其中就明令禁止网络暴力与人肉搜索，学术界对网络暴力的研究也逐渐增多。
Peer Review Status:Awaiting Review
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