1,723,268 research outputs found
Social change and intergenerational family support amongst three cohorts of older people in China - a mixed methods study
No full textChina’s ageing process is accelerating as the large birth cohorts of the 1950s and 1960s enter their old age. Existing literature in China, as in many developing countries, has largely regarded older people as a homogeneous group and neglects the changing life experiences of different ageing cohorts and how their characteristics change accordingly. This study contributes to ageing research by using a life-course perspective and cohort lens to investigate the early life experiences and later life ageing scenarios amongst the cohorts born in the 1940s, 1950s and 1960s; cohorts whose lives have been shaped by China’s social and economic transformation over the past seven decades. It sheds light on the possible family care circumstances of future older people, represented by the 1960s cohort, and proposes relevant policy interventions.By employing a sequential-explanatory mixed methods approach, this research finds that: 1) Each birth cohort has been influenced by the transformation of the last 70 years in a distinctive way. Thus they have different needs and expectations for later life, and the vulnerable groups within each cohort are distinct and have specific primary needs. 2) Overall, there are four main influences on the patterns of intergenerational support between older people and their adult children: parents’ SES, parents’ needs, children’s SES, and the effect of investment.3) Although the 1960s cohort has fewer adult children ‘available’, they are better off, better educated, and more modern and independent than previous cohorts. Consequently, they are likely to expect more emotional rather than material support from their children. 4) Social support agencies need to collaborate, and to work alongside adult children, to provide long-term care for future cohorts of older people in China. More targeted social policies are needed to meet the specific needs of vulnerable groups amongst different cohorts of older people.Future research needs to address the following groups: older men who have experienced divorce, those older people who have migrated, and one-child families; and issues: technological development and ageing scenarios, and long-term care provision for rural and less-developed communities.<br/
Energy efficiency and classification accuracy trade-offs in accelerometry-based activity recognition
No full textDriven by growing real-world application 'such as healthcare challenges, accelerometry-based activity recognition has been widely studied as a potential context-aware subsystem for the future pervasive healthcare system. Reliable, accurate recognition and energy efficiency to enable long-term and non-intrusiveness activity monitoring are the key issues for practical use in healthcare applications. A great number of activity recognition systems have been proposed focusing on sensor node design and recognition algorithm development to achieve good classification performance, while the trade-offs between recognition accuracy and energy efficiency has not been investigated in depth. This research investigates this issue by comparing on-node and off-node activity recognition schemes through a practical development. The main contribution of this research is concluded as follows. Firstly, the trade-offs between classification accuracy and energy efficiency is raised as the key issue in sensor based activity recognition system to tackle the real world application challenges. Then this research presents a systematic, empirical design process for optimizing an activity recognition system with respect to the above issue. Such design process involves defining application, designing hardware platform, developing classification recognition algorithm, energy consumption modelling and real system performance evaluation. On-node and off-node classification schemes are the two design philosophies which are compared in this process. This research performs the first step to strike the energy-accuracy trade-offs in body sensor based activity recognition system. The future work should be generalised in two ways. First, different design schemes between the two extreme design philosophies are to be analysed. Then, more classification algorithms should be investigated.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
“It is not simply the loss of a child”: The challenges facing parents who have lost their only child in post-reproductive age in China
No full textThe death of one’s only child in post-reproductive age (in Chinese, shidu) is a traumatic event that has specific cultural implications in China. This study investigates the experience of a changed life and emerging challenges amongst Chinese shidu parents. Thematic analysis of 36 interviews revealed four main life consequences following shidu: impairment of psychological and physical health, weakening of social networks and interactions, loss of meaning in life, and lack of care and security. We suggest that health monitoring and mental health intervention, adequate social and community support, and improved social security are the critical needs in this vulnerable group
Euhybus newly recorded from Tibet with descriptions of two new species (Diptera: Empidoidea, Hybotinae)
No full textWang, Ning, Li, Zhu, Yang, Ding (2013): Euhybus newly recorded from Tibet with descriptions of two new species (Diptera: Empidoidea, Hybotinae). Zootaxa 3686 (3): 373-380, DOI: 10.11646/zootaxa.3686.3.
Health, safety and environmental study of glass bubble application drilling and completion fluids / Wang Ning
Full text linkLightweight drilling and completion fluids are widely used for near-balanced, balanced or under-balanced drilling to reduce loss of fluids which can cause serious problems. They are also used to protect the reservoirs during the drilling process. As a newly introduced technology, glass bubbles, also known as Hollow Glass Spheres (HGS), are now being used to obtain lightweight fluids instead of other technologies such as air/dust drilling, as they are more environmentally friendly and low-cost. The health, safety, and environmental impacts of the application of glass bubbles in drilling and completion fluids have been previously reviewed and studied. By doing literature review and analyzing the process of their application, two health, safety, and environmental risks were found: lung disease attributable to inhalation of glass bubble dust and physical injury resulting from direct contact with glass bubbles. To avoid such risks, several suggested measures have been proposed. Moreover, the environmental impact of the application of glass bubbles in drilling and completion fluids is quite unobvious, and so there is an opportunity and reason to conduct further investigation and research on this subject matte
Ci xing na mi ke li de jin gang shi liang zi chuan gan: ji chu he ying yong
No full textPh.D.Magnetic nanoparticles have broad applications in information storage, bio-medicine, life science, and paleology. They are also an interesting platform for studying condensed matter physics at the nanoscale. However, it is challenging to study the magnetic properties of individual nanoparticles under ambient conditions. The nitrogen-vacancy (NV) center in diamond is promising for nanoscale quantum sensing due to its atomic size and long spin coherence time. It is an ideal probe to study nanomagnetism.This thesis presents our experimental studies of single magnetic nanoparticles (MNPs) near their phase transition temperatures, with nearby NV centers as nanoscale sensors. Firstly, we observe the phase transition of a single MNP using nanodiamond sensors. The magnetization critical exponent of single MNPs is extracted from the magnetization curve. Then, we design and experimentally demonstrate a hybrid nano-thermometer composed of NV centers and an MNP. The temperature sensitivity is enhanced by the magnetic criticality of the MNP near its ferromagnetism-paramagnetism transition. We achieve a sensitivity of 11 mK/√Hz under ambient conditions. A nano-thermometer with such sensitivity may have wide applications for studying nanoscale thermal processes. Based on the hybrid system, we observe the real-time superparamagnetic (SPM) reversal of a single MNP under ambient conditions. The SPM reversal rate monitored by the nearby NV centers covers six orders of magnitude in the time domain within 10 K temperature variation. The SPM reversal rate as a function of the temperature indicates that the Néel-Arrhenius law is still valid when the temperature is ~ TC/20 below the critical temperature. Our method provides a supplementary platform to study the magnetization dynamics, critical behaviors, and spin fluctuations of small systems.磁性納米顆粒在信息存儲，生命科學和醫學以及古磁學中有廣泛的應 用。它們也是研究納米尺度下凝聚態物理問題的重要平台。然而，在室溫 大氣環境下研究單顆納米顆粒的磁學性質是具有挑戰性的。金剛石中的氮 空位中心憑藉其原子尺度的空間分辨率和極長的自旋相干時間成為納米尺 度量子傳感工具。它也是研究納米磁性的理想探針。本論文以金剛石氮空位中心為量子探針，圍繞單個磁性納米顆粒在 相變點附近的基礎物理問題和應用展開一系列研究。首先，我們用金剛 石氮空位中心觀測到了單顆磁性納米顆粒的鐵磁-順磁相變。從它們的磁 化曲線中可以得到單顆磁性納米顆粒的相變臨界指數。隨後，我們提出 並實現了一個由含有集群氮空位中心的納米金剛石和一個磁性納米顆粒 組合成的複合納米溫度計。由於鐵磁到順磁相變的加強作用，我們實現 了11 mK/√Hz的溫度探測靈敏度。這是目前可以工作在室溫大氣環境下 的最靈敏納米溫度計，將會在納米測溫學中有許多應用。進一步地，基於 這樣一個複合體系，我們實時觀測到了單顆磁性納米顆粒的超順磁翻轉， 其超順磁翻轉時間在10度以內就變化了六個數量級。實驗顯示在溫度近 於1/20居里溫度時，Néel-Arrhenius 定律仍然成立。我們的方法為研究納 米系統的磁化動力學，臨界行為和自旋漲落提供了新的平台和思路Wang, Ning = 磁性納米顆粒的金剛石量子傳感 : 基礎和應用 / 王宁.Thesis Ph.D. Chinese University of Hong Kong 2019.Includes bibliographical references (leaves 132-163).Abstracts also in Chinese.Title from PDF title page (viewed on …).Wang, Ning = Ci xing na mi ke li de jin gang shi liang zi chuan gan : ji chu he ying yong / Wang Ning
Rhaphium (Diptera: Dolichopodidae: Rhaphiinae) from China with six new species
No full textTang, Chufei, Wang, Ning, Yang, Ding (2016): Rhaphium (Diptera: Dolichopodidae: Rhaphiinae) from China with six new species. Zootaxa 4162 (3): 581-593, DOI: http://doi.org/10.11646/zootaxa.4162.3.1
FIGURES 17–20 in New species of Hybos Meigen from Northwest China (Diptera: Empidoidea, Hybotinae)
No full textFIGURES 17–20. Hybos xii sp. nov. (male). 17. Genitalia, dorsal view; 18. right surstylus; 19. left surstylus; 20. hypandrium, ventral view. Scale bar = 0.1 mm.Published as part of Li, Zhu, Wang, Ning & Yang, Ding, 2014, New species of Hybos Meigen from Northwest China (Diptera: Empidoidea, Hybotinae), pp. 166-180 in Zootaxa 3786 (2) on page 178, DOI: 10.11646/zootaxa.3786.2.5, http://zenodo.org/record/22962
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