Subjects: Medicine, Pharmacy >> Traditional Chinese Medicine and Chinese Materia Medica submitted time 2023-11-03
Abstract： This article reviews the clinical nursing of one patient with lumbar disc herniation syndrome treated with Chinese herbal ointment, and summarizes the nursing experience. Through the accurate nursing assessment of patients, the nursing goals of patients are clarified, and on the basis of routine nursing and health education, through the implementation of Chinese herbal ointment technology, it can effectively improve patients' pain and lower limb weakness. Traditional Chinese medicine ointment for the treatment of lumbar and lumbar disc herniation syndrome has obvious clinical efficacy, and has few adverse reactions, which is easy for patients to accept.
Peer Review Status:
Awaiting Review
Subjects: Statistics >> Social Statistics submitted time 2023-08-12 Cooperative journals: 《中国科学院院刊》
Abstract： After more than 50 years of development, the Xianghe station (XH), Institute of Atmospheric Physics, Chinese Academy of Sciences, has been equipped with comprehensive detection capabilities covering from the boundary layer to the middle and upper levels of the atmosphere. As one of the few atmospheric integrated field scientific test stations in the world, XH has joined a number of important networks. Many large international field campaigns have been carried out. Long-term continuous observation data are widely used to study exchange of energy and mass in the middle and upper atmosphere, atmospheric physical chemistry and air quality in the boundary layer, as well as assess and forecast solar energy. We would pursue the continuous development of advanced detection instruments to improve our detection capabilities of the thermodynamic properties of the middle and upper atmosphere as well as the physical and chemical processes within the boundary layer. Observation, testing and research will then be integrated to improve our understanding of the critical processes of the middle atmosphere, weather and climate effect of air pollution control measures, thereby, providing technological support for national climate and environmental diplomacy and national security.
Subjects: Geosciences >> Geography submitted time 2023-07-19 Cooperative journals: 《干旱区地理》
Abstract：水土资源是农业生产最重要的基础性资源，其空间的合理有效配置有利于资源的充分利用和区域可持续发展。以疏勒河流域为研究对象，基于水足迹理论核算流域农业生产水足迹变化规律，采用基尼系数和空间错配模型定量评估研究区20002020年农业水土资源的时空匹配动态趋势及其敏感性。结果表明：（1）20002020年疏勒河流域农业作物生产水足迹和作物种植面积总体呈波动下降趋势，作物生产水足迹峰值出现在2007、2018年，作物种植面积峰值出现在2009、2018年；流域年均蓝水足迹贡献率达90.9%，且与绿水足迹呈互补关系，表明蓝水是疏勒河流域农业用水的主要来源。（2）农业水土资源的空间匹配程度逐渐提高，总体处于较匹配的状态；蓝、绿水足迹与作物种植面积的空间不匹配程度逐渐得到改善，空间分布中均呈现出中部高、四周低的特点。（3）作物种植面积对作物生产水足迹变化呈中、高度敏感性的地区数量不断增加趋势。
Subjects: Nursing >> Nursing submitted time 2023-04-24
Abstract： To explore the causes and nursing strategies of peripherally inserted central catheters (PICC) removal difficulty in senior elderly patients. A senior elderly patient with PICC difficulty for removing was analyzed comprehensively. The main reasons for the difficulty of removal were the adhesion of the catheter tip to the wall of superior vena cava, the change of anatomical structure of the vein and the loss of elasticity of the catheter after repeated pulling. The senior elderly group has some characteristics different from the general patient group, such as long-term bed rest, limb loss, long-term intravenous parenteral nutrition and so on, During the use of PICC, attention should be paid to abnormal changes of catheter, consult with specialist nurses in time, and solve problems with multidisciplinary consultation when necessary, so as to avoid difficulties in removal caused by improper maintenance and improper removal operation and serious complications caused by removal failure.
Peer Review Status:Awaiting Review
Subjects: Library Science，Information Science >> Library Management submitted time 2023-04-21
Abstract： Purpose/Significance In response to the critical period of intelligent transformation and connotative development of university libraries, this paper explores the construction of a knowledge service system that is suitable for the development of first-class universities, leading innovative development in the new era from a interdisciplinary perspective, achieving a leapfrog transformation of the university library industry, and assisting in the high-quality development of higher education. Method/Process By analyzing the current situation and needs of library knowledge services, clarifying the connotation and implementation path of knowledge services, and taking the exploration and practice of knowledge services of Beijing Institute of Technology Library as an example, this paper constructs a knowledge service system that serves first-class universities from the aspects of construction goals and positioning, service platforms, and managementt and operation mechanism, and elaborates on the future development direction of library knowledge services. Results/Conclusion First class university libraries must seize the development opportunities of the new era, take knowledge as the core, innovate institutional mechanisms, build a knowledge service system that serves the construction of first-class universities, create a knowledge innovation development platform that can release digital productivity, and make contributions to promoting the digital construction of higher education and the construction of a cultural power.
Subjects: Geosciences >> Geography submitted time 2023-04-07 Cooperative journals: 《干旱区地理》
Abstract： Ecosystem services are closely linked to sustainable human development. Studying the supply and demand characteristics of regional ecosystem services and comprehending their spatial matching status are essential prerequisites for achieving the efficient allocation of ecological resources and promoting regional ecological security. The water production, carbon sequestration, and food services of the Shule River Basin in the Gansu Province of China were all examined on the basis of multisource data and with the assistance of the InVEST model as well as the ArcGIS and GeoDA software. The following are the results of this study: (1) There are discrepancies between different regions and ecosystem services; except for water production services, the supply of other ecosystem services in the Shule River Basin is more than the demand. (2) The supply-demand ratio of comprehensive services in the Shule River Basin is 0.063, and the supply-demand ratios of different ecosystem services are carbon sequestration services (0.1854) >food services (0.0078) >water production services ( −0.0043). (3) Water production and carbon sequestration service spaces are mainly based on low-high-type and high-low-type spatial dislocation, respectively, whereas food service spaces are primarily based on low-low-type spatial matching, among which the spatial mismatch of water production services is the most severe.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： With the fast growth of the Chinese economy, the Chinese language has become one of the most widely spoken world languages. There is a steady growth of empirical studies on the neural mechanisms underlying the learning of Chinese as a second language (L2). Yet, research on the specific brain mechanisms and the corresponding theoretical models for Chinese L2 learning are still in their infancy. Research in the past two decades has revealed that: 1) Chinese tone learning relies on the brain areas of the right superior temporal gyrus and the inferior frontal gyrus when learners are at a lower L2 proficiency, and then shifts to the left superior temporal gyrus as they reach advanced proficiency; 2) Chinese character learning is related to the inferior frontal gyrus and the right fusiform gyrus, whereas Chinese phonological learning is closely related to the left temporal-parietal areas; 3) Overall, Chinese L2 learning relies more on right-hemisphere brain regions (e.g., inferior frontal gyrus, fusiform gyrus) at the early stages of L2 learning, and the reliance decreases with the improvement of L2 competence. To sum up, Chinese L2 learning undergoes a dynamic neural change from an early stage of right-hemisphere reliance to a later stage of left-lateralization or bilateralization. The findings support the Assimilation Hypothesis in the Assimilation-Accommodation Hypothesis (Perfetti & Liu, 2005) which argues that extra right-hemisphere brain regions are activated in L2 learning when the typical left-hemisphere regions for first language processing cannot adapt to L2 input processing. The findings above also support the Dynamic Restructuring Model (Pliatsikas et al., 2020), which states that learners’ brain functions and neural structures go through dynamic changes at different stages of L2 learning. Furthermore, L2 learning strategies and learners’ auditory perception abilities are found to influence brain functions, neural structures, and connectivity networks. These findings are in line with the prediction of the Unifying the Bilingual Experience Trajectories model (DeLuca et al., 2020) which claims that bilinguals’ linguistic and cognitive representations are strongly influenced by their language experiences (e.g., language typology, language usage, code-switching frequency, proficiency, and age of acquisition). The current theoretical models of L2 Chinese learning can be further strengthened by considering factors such as L1-L2 characteristics, individual differences, learning strategies, and learning contexts. Future research on Chinese L2 learning can investigate learners of varying characteristics (e.g., young learners and high-proficiency learners), triangulate research paradigms, and synthesize behavioural, functional and structural brain imaging data of language processing and production. Meanwhile, new neuroscience techniques have created the opportunity to investigate the socio-cognitive mechanisms of L2 learning under different interaction situations, such as teacher-student, student-student, and computer-student interactions. More future research in this field can advance the current theoretical models and understanding of neuroplasticity in Chinese L2 learning.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Much evidence shows that people living in low socioeconomic conditions often engage in "short-sighted behavior". They seem to focus on meeting short-term needs and aspirations rather than long-term benefits and returns, such as investing less in education, saving too little, and borrowing too much. These choices may further deepen their disadvantage and cause them to fall into the trap of "low socioeconomic status-behavioral decision-making-low socioeconomic status". Why are people living in low socioeconomic conditions more likely to be short-sighted? Previous studies believe that low socioeconomic status shapes individual preferences and values and impairs self-control. These defects make them more likely to make irrational behavioral decisions. However, in recent years, researchers have pointed out that the seemingly irrational behavior of people living in low socioeconomic conditions is an adaptive response to a threatening environment. People who live in low socioeconomic conditions always face various risks and threats, such as resource scarcity, environmental instability and unpredictability, and a bad childhood environment. If the current demand is high and the future is uncertain, it is more beneficial to obtain the smaller benefits available at present than to wait for the larger returns in the future. Scarcity theory, construction level theory, and life history theory are three representative theoretical viewpoints that answer the mechanism behind the “short-sighted behavior” of the people who live in low socioeconomic conditions from the perspective of the interaction between individual and the environment. The psychological shift model integrates them from the perspective of threat, regards the "short-sighted" behavior of the people living in low socioeconomic conditions as the product of the operation of the general social and psychological mechanism, and points out that the psychological shift triggered by threat perception is the internal mechanism of low socioeconomic status affecting intertemporal choice. Specifically, the experience of living in low socioeconomic conditions induces a “psychological shift” in response to socioecological cues. At the cognitive level, they focus on things related to scarcity when facing the threat of scarcity. At the level of thinking, they represent events concretely and contextually when facing uncertain threats. At the behavioral strategy level, once the threat cues appear, people who experience low socioeconomic conditions in childhood may notice the threat faster and switch to the fast life history strategy. These psychological shifts lead to the occurrence of "short-sighted behavior". To attribute a more practical policy value to the psychological shift model, future research can be carried out from the following aspects: First, the research perspective that "short-sightedness" is the survival strategy of people living in low socioeconomic conditions in a threatening environment needs to be further popularized. This adaptive perspective more comprehensively and accurately describes the intertemporal choice process of people living in low socioeconomic conditions, reduces the stigmatization of people living in low socioeconomic conditions to a great extent. Second, the mechanism of poverty affecting intertemporal choice needs to be further studied. The novel and enlightening psychological shift model from the perspective of threat needs much empirical research to confirm. The multilevel relationship between low socioeconomic status and intertemporal choice in different development stages still needs to be discussed. Finally, “short-sighted behavior” intervention for people living in low socioeconomic conditions needs to be carried out widely and deeply. Based on the core mechanism of eliminating threats to reduce short-sighted behavior, future studies should combine the valuable experience accumulated in the process of poverty alleviation and the internationally agreed strategies that can significantly reduce the “short-sightedness” of the people living in low socioeconomic conditions. These actions may help develop an effective intervention program in line with China's national conditions, so as to provide scientific psychological paths for realizing common prosperity.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Having lower socioeconomic status is one of the most well-established social predictors of poor health. However, little is known about why some lower-class individuals maintain good physical health despite experiencing adversity. From a large number of empirical studies, researchers have found that psychological factors such as the “shift-and-persist” strategy can effectively protect the health of lower-class individuals in adversity and prevent them from developing certain diseases. The present study shows that in the midst of adversity, some individuals find role models who teach them to trust others, better regulate their emotions, and focus on their future. A role model is any individual who serves as an attachment figure and provides inspiration to a child and can be a parent, extended family member, or teacher. Over a lifetime, lower-class individuals with such role models develop an approach to coping with stress that helps them accept pressures and reappraisals (shift) while enduring adversity by maintaining a sense of meaning and optimism (persist). In contrast, among higher-class individuals, proactive efforts to cope aimed at eliminating stressors and the pursuit of future goals may be more effective, given such individuals' greater access to resources for engaging in preventive behaviors, resolving situations, and influencing outcomes. The “shift-and-persist” model proposes that for lower-class individuals, developing a way of life that values changing oneself in coping with pressure while insisting on enduring adversity with strength and maintaining optimism and hope for the future can reduce the stress response, thereby protecting one's health. Why can the “shift-and-persist” strategy effectively protect the health of the lower class? Researchers have explained how a “shift-and-persist” strategy can affect the health of the lower class in reference to physiology and behavior. Specifically, the approach balances adaptation to stress and persistence at the same time, changes the physiological pathway of stress, and inhibits the physiological stress response of the lower-class in the face of adversity. In other words, the “shift-and-persist” strategy reduces responses to stress, thereby reducing the acute physiological activation of the hypothalamic-pituitary-adrenocortical (HPA) axis. Over time, this prevents the development of the pathogenic process and ultimately slows pathogenic disease processes over the long term among lower-class individuals. Specifically, first, a “shift-and-persist” strategy can effectively reduce the repeated activation of the HPA axis among lower-class individuals and then play a protective role in health. Cortisol, the end product of the HPA axis, is one of the most widely used physiological indicators of psychosocial stress, and researchers often use it as an indicator of HPA axis activity. Second, a “shift-and-persist” strategy can effectively regulate the inflammatory process of lower-class individuals to reduce the risk of developing chronic diseases. Low-grade inflammation has been implicated in the pathogenesis and expression of several chronic diseases associated with aging. Lower-class individuals are also more likely to engage in unhealthy behaviors, such as smoking, sedentary lifestyles and following a high-fat diet. These unhealthy behaviors increase the risk of developing cardiovascular disease and cancer and of early death. Preliminary evidence shows that different dimensions of the “shift-and-persist” strategy can reduce the health-threatening behavior of lower-class individuals to reduce the risk of disease. In sum, the “shift-and-persist” strategy has drawn interest from researchers, its theoretical and practical value has been continuously examined, and it presents good development prospects. To address the problem of health poverty in a period of relative-poverty in China and better serve the health of lower-class individuals, future research can focus on the following aspects. First, research must be conducted in a longitudinal fashion to establish whether “shift-and-persist” strategies can predict health trajectories over time in children and adults. Second, from a multilevel and multipath perspective, studies must comprehensively investigate the mechanism by which a “shift-and-persist” strategy affects the health of lower-class individuals. Finally, future studies should vigorously develop intervention programs to promote a “shift-and-persist” strategy.
submitted time 2023-03-25 Cooperative journals: 《心理科学进展》
Abstract： With the fast growth of the Chinese economy, the Chinese language has become one of the most widely spoken world languages. There is a steady growth of empirical studies on the neural mechanisms underlying the learning of Chinese as a second language (L2). Yet, research on the specific brain mechanisms and the corresponding theoretical models for Chinese L2 learning are still in their infancy. Research in the past two decades has revealed that: 1) Chinese tone learning relies on the brain areas of the right superior temporal gyrus and the inferior frontal gyrus when learners are at a lower L2 proficiency, and then shifts to the left superior temporal gyrus as they reach advanced proficiency; 2) Chinese character learning is related to the inferior frontal gyrus and the right fusiform gyrus, whereas Chinese phonological learning is closely related to the left temporal-parietal areas; 3) Overall, Chinese L2 learning relies more on right-hemisphere brain regions (e.g., inferior frontal gyrus, fusiform gyrus) at the early stages of L2 learning, and the reliance decreases with the improvement of L2 competence. To sum up, Chinese L2 learning undergoes a dynamic neural change from an early stage of right-hemisphere reliance to a later stage of left-lateralization or bilateralization. The findings support the Assimilation Hypothesis in the Assimilation-Accommodation Hypothesis (Perfetti & Liu, 2005) which argues that extra right-hemisphere brain regions are activated in L2 learning when the typical left-hemisphere regions for first language processing cannot adapt to L2 input processing. The findings above also support the Dynamic Restructuring Model (Pliatsikas et al., 2020), which states that learners’ brain functions and neural structures go through dynamic changes at different stages of L2 learning. Furthermore, L2 learning strategies and learners’ auditory perception abilities are found to influence brain functions, neural structures, and connectivity networks. These findings are in line with the prediction of the Unifying the Bilingual Experience Trajectories model (DeLuca et al., 2020) which claims that bilinguals’ linguistic and cognitive representations are strongly influenced by their language experiences (e.g., language typology, language usage, code-switching frequency, proficiency, and age of acquisition). The current theoretical models of L2 Chinese learning can be further strengthened by considering factors such as L1-L2 characteristics, individual differences, learning strategies, and learning contexts. Future research on Chinese L2 learning can investigate learners of varying characteristics (e.g., young learners and high-proficiency learners), triangulate research paradigms, and synthesize behavioural, functional and structural brain imaging data of language processing and production. Meanwhile, new neuroscience techniques have created the opportunity to investigate the socio-cognitive mechanisms of L2 learning under different interaction situations, such as teacher-student, student-student, and computer-student interactions. More future research in this field can advance the current theoretical models and understanding of neuroplasticity in Chinese L2 learning.
Subjects: Psychology >> Physiological Psychology submitted time 2021-12-17
Abstract： " Having lower socioeconomic status is one of the most well-established social predictors of poor health. However, little is known about why some lower-class individuals maintain good physical health despite experiencing adversity. From a large number of empirical studies, researchers have found that psychological factors such as the "shift-and-persist" strategy can effectively protect the health of lower-class individuals in adversity and prevent them from developing certain diseases. Specifically,the “shift-and-persist” strategy reduces responses to stress, thereby reducing the acute physiological activation of the HPA axis. Over time, this prevents the development of the pathogenic process and ultimately slows pathogenic disease processes over the long term among lower-class individuals. Meanwhile, Preliminary evidence shows that different dimensions of the “shift-and-persist” strategy can reduce the health-threatening behavior of lower-class individuals to reduce the risk of disease.To address the problem of health poverty in a period of relative-poverty in China and better serve the health of lower-class individuals, future research should vigorously develop intervention programs on the basis of in-depth exploration of the core mechanism. "
Peer Review Status:Awaiting Review
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2018-06-15 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To compare the medium- and long-term effect of pneumatic ballistic extracorporeal shock wave versus ultrasound-guided hormone injection in the treatment of plantar fasciitis. Methods The clinical data were collected from patients with plantar fasciitis admitted to PLA General Hospital pain department from September, 2015 to February, 2017. The patients were randomly divided into ultrasound-guided drug injection group and shock wave group. The therapeutic parameters including the numerical rating scale (NRS) scores in the first step pain in the morning, American Orthopedic Foot and Ankle Society (AOFAS) Ankle Hindfoot Scale, and thickness of the plantar fascia were monitored before and at 1 week, 1 month, 3 months, and 6 months after the treatment. The recurrence rate, effectiveness, and patient satisfaction were compared between the two groups at 6 months after the treatment. Results Thirty-nine patients were enrolled in shock wave group and 38 patients in ultrasound group. The NRS scores in the first step pain in the morning were lowered after treatment in both groups (P<0.05), and the scores were significantly lower in ultrasound group than in shock wave group at 1 week and 1 month (P<0.01), but significantly higher in ultrasound group than in shock wave group at 3 and 6 months after treatment (P<0.05). The AOFAS functional scores were increased in both groups (P<0.05) at 6 months after treatment, was significantly lower in ultrasound group than in shock wave group than group B (90.44�3.27 vs 75.76�1.40; P<0.05). The effective rates in shock wave group and ultrasound group were 92.31% and 76.32%, respectively (P<0.05). Recurrence was found in 1 patient (2.56%) in shock wave group and in 8 (21.05%) in ultrasound group (P<0.05). The patient satisfaction scores were significantly higher in shock wave group than in ultrasound group (8.13�.67 vs 6.63�.75, P=0.048). Conclusion Pneumatic ballistic extracorporeal shock achieves better medium- and long-term outcomes than ultrasound-guided hormone injection in the treatment of plantar fasciitis.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-04-17 Cooperative journals: 《计算机应用研究》
Abstract： In order to solve long time consuming problems of single CPU computed tomographic reconstruction and the problems of high cost and high energy consumption in the reconstruction using CPU cluster, this paper proposed a heterogeneous reconstruction model of CPU multithreads +GPU . This model used the CPU multithread pipelining pattern, it divided the whole task into several stages, and it connected each two adjacent phases by a loop buffer. Once the calculation of the current task stage completes, the data would be put into the loop buffer, and then the next computing task would continue to execute. When the data in the loop buffers was detected by the latter stage, the data would be removed from the loop buffers and calculated. In this way, each thread processes tasks in a parallel way. For a time consuming bottleneck module, the parallel acceleration of GPU was adopted to give full play to the computing resources of CPU and GPU. The CPU multithreads +GPU model is 16.45 times faster than the CPU multithreaded model, and accelerates more than 20.5 times faster than serial CT image reconstruction. By燾omparing with爀xperimental爎esults of CPU serial program, the result of the CPU multithreads +GPU model can meet the experimental design requirement in the range of error tolerance. The image reconstruction model proposed by using low cost GPU has greatly enhanced performance, greatly reduces the cost and power consumption of the CT system . The reduction in cost and power consumption will lead to a reduction in the cost of CT medical diagnosis, which will eventually benefit patients.
Subjects: Biology >> Bioengineering submitted time 2017-11-21 Cooperative journals: 《中国生物工程杂志》
Abstract：抗菌肽因其具有广谱抗菌活性、不容易引起抵抗性，被认为是先天免疫系统对抗微生物感染的多功能工具。然而，因天然抗菌肽存在抗菌活性低、稳定性低、溶血性高等问题，使其较难应用于临床，所以研究人员对抗菌肽进行改良设计以期获得更高抗菌活性、更低溶血活性的新型抗菌肽。另外，天然抗菌肽作为一类免疫效应因子而被发现，其表现出的抑菌、免疫调节、内毒素中和等作用，使得研究人员对抗菌肽在抗炎作用的研究表现出极大的兴趣。本文就抗菌肽的药物设计方法及抗炎作用机制进行了综述。
Subjects: Biology >> Bioengineering submitted time 2017-11-21 Cooperative journals: 《中国生物工程杂志》
Abstract：抗菌肽因其具有广谱抗菌活性、不容易引起抵抗性，被认为是先天免疫系统对抗微生物感染的多功能工具。然而，因天然抗菌肽存在抗菌活性低、稳定性低、溶血性高等问题，使其较难应用于临床，所以研究人员对抗菌肽进行改良设计以期获得更高抗菌活性、更低溶血活性的新型抗菌肽。另外，天然抗菌肽作为一类免疫效应因子而被发现，其表现出的抑菌、免疫调节、内毒素中和等作用，使得研究人员对抗菌肽在抗炎作用的研究表现出极大的兴趣。本文就抗菌肽的药物设计方法及抗炎作用机制进行了综述。
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2017-03-26
Abstract：稀土三价钐离子掺杂不同基质发光材料由于在照明、显示器件、激光等许多领域都具有广泛的应用前景而受到广泛关注并得到深入研究.本文介绍了三价钐离子的能级结构、荧光物质发光性能的影响因素及三价钐离子掺杂不同基质发光材料的发光机理和发光性能,提出了稀土荧光物质在户外领域应用时存在的问题及解决问题的途径,对荧光物质/聚合物复合材料的发展方向进行了展望.认为制备工艺简单、成本低、化学性能稳定、转光效率高的荧光物质/聚合物复合材料兼备聚合物和荧光物质二者的优点,作为一种新型的功能复合材料具有较大的市场前景.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2017-03-26
Abstract：正电子湮没谱学技术成为研究材料微观结构的特色表征技术,是基于正电子在材料中与微观缺陷的捕获湮没机制近年来正电子湮没多参数测量技术的发展,进一步拓展了其在新型功能材料微观结构研究中的应用.本文综合正电子湮没寿命谱及多参数测量技术,针对近年来材料辐照改性、辐照损伤等复杂微观缺陷结构的研究,以二元Fe-Cu合金辐照损伤缺陷及微量Cu析出物的微观结构研究为基础,综合论述正电子湮没谱学技术在Fe-Cu合金复杂微观缺陷结构研究中的应用研究进展.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2017-03-24
Abstract：有机－无机杂化膜兼具高分子膜和无机膜的特点,可克服常规分离膜遭遇的渗透性与选择性能间的trade-off问题,是一种有广泛用途的膜材料研究表明,应用正电子湮没寿命谱和正电子湮没符合多普勒展宽能谱等正电子湮没谱学技术能从微观尺度对聚合物-金属有机骨架材料杂化膜PDMS-MIL-101(Cr)的微观结构进行了表征,结果表明,随着MOFs添加量的增大,交联位置处的空位和聚合物基体的自由体积的尺寸都变小,MOFs进入了聚合物的自由体积.杂化膜的正电子湮没符合多普勒展宽能谱显示,MIL-101(Cr)亚纳米粒子的加入使得正电子在聚合物基体PDMS氧原子上的偏向湮没效应减弱,部分正电子与来自MIL-101(Cr)亚纳米粒子中金属原子的电子发生湮没,表明MOFs进入自由体积后与PDMS中的氧原子形成键,遮挡了自由体积周围的部分氧原子 .结果表明,应用正电子湮没谱学技术从微观尺度上表征有机-无机杂化膜的微观结构是非常有效的实验分析方法.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2017-03-24
Abstract：对稀土铕离子掺杂聚合物基荧光材料的制备方法进行了分析归纳,介绍了稀土离子配位数及离子簇的存在对发光性能的影响机制,同时列举了聚合物基荧光复合材料在农业、生物医学、防伪鉴别等方面的应用.针对实践应用对物理性能的要求,提出了传统方法制得的材料在应用中存在的问题并对具有综合特性的方法进行了展望.认为针对不同应用制备镶嵌荧光物质的前体作为复合材料两相的桥梁,具有极大的应用前景.
Peer Review Status:Awaiting Review
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