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"Yin, Lu"
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\الحزام والطريق\ : مبادرة نحو عولمة شاملة
هذا الكتاب هو الأول من نوعه الذي يتناول مفهوم العولمة الشاملة في ضوء مبادرة \"الحزام والطريق\" الصينية التي أعلن عنها الرئيس الصيني عام 2013، وهو يضم تفسيرات شاملة للعولمة الاقتصادية التي تعد المحور الأساسي لمفهوم العولمة الشاملة، ويستعرض هذا الكتاب في قسمين رئيسيين، الخلفية التاريخية لمبادرة الحزام والطريق، منذ نشأة طريق الحرير القديم، كما يتناول مفهوم العولمة الاقتصادية وقيودها، والتوسع الاقتصادي العالمي قبل الحرب العالمية الثانية، وحدود العولمة الاقتصادية وإمكاناتها، بالإضافة إلى تغيرات نمط الاقتصاد العالمي، وتحولات التنمية الصينية، وفكر ودلالة بناء \"الحزام والطريق\"، بما في ذلك الدلالة الجغرافية والاقتصادية والتجارية وغيرها، كما يتناول العلاقة بين بناء \"الحزام والطريق\" و\"استراتيجية التنمية الإقليمية\"، وبناء ممرات نقل برية عابرة للحدود، وصناعة نموذج \"استراتيجية الانطلاق العالمية\"، وبناء منصة للانفتاح على العالم، بالإضافة إلى التعاون الثقافي بين البلدان الواقعة على طول الحزام والطريق. أما القسم الثاني من الكتاب فيضم عددا من الدراسات والبحوث الأكاديمية التي تتناول المحتوى العلمي لمبادرة \"الحزام والطريق\" وتعزيز السلام والتنمية العالمية من خلال \"روح طريق الحرير\" وكذلك نقاط سوء الفهم حول المبادرة، بالإضافة إلى لقاءات مع مراسلي أكبر الشبكات الإعلامية الصينية، التي تناولت قيادة حقبة جديدة من العولمة الشاملة من أجل بناء هيكل اقتصادي عالمي أكثر توازنا وشمولا.
Book
Reducing the H0 tension with exponential acoustic dark energy
The Hubble tension arises from different observations between the late-time and early Universe. We explore a new model with dark fluid, called the exponential acoustic dark energy (eADE) model, to relieve the Hubble tension. The eADE model gives an exponential form of the equation of state (EoS) in the acoustic dark energy, which is the first time to explore an exponential form for the EoS. In this model, the gravitational effects from the acoustic oscillations of the model can impact the CMB phenomena at the matter radiation equally epoch. We give the constraints of the eADE model by the current cosmological dataset. The comparison of the phenomena with the standard model can be shown through CMB and matter power spectra. The fitting results of our model have H0=70.06-1.09+1.13 in 95% C.L. and a smaller best-fit value than ΛCDM.
Journal Article
Ultrafast water sensing and thermal imaging by a metal-organic framework with switchable luminescence
A convenient, fast and selective water analysis method is highly desirable in industrial and detection processes. Here a robust microporous Zn-MOF (metal–organic framework, Zn(hpi2cf)(DMF)(H
2
O)) is assembled from a dual-emissive H
2
hpi2cf (5-(2-(5-fluoro-2-hydroxyphenyl)-4,5-bis(4-fluorophenyl)-1
H
-imidazol-1-yl)isophthalic acid) ligand that exhibits characteristic excited state intramolecular proton transfer (ESIPT). This Zn-MOF contains amphipathic micropores (<3 Å) and undergoes extremely facile single-crystal-to-single-crystal transformation driven by reversible removal/uptake of coordinating water molecules simply stimulated by dry gas blowing or gentle heating at 70 °C, manifesting an excellent example of dynamic reversible coordination behaviour. The interconversion between the hydrated and dehydrated phases can turn the ligand ESIPT process on or off, resulting in sensitive two-colour photoluminescence switching over cycles. Therefore, this Zn-MOF represents an excellent PL water-sensing material, showing a fast (on the order of seconds) and highly selective response to water on a molecular level. Furthermore, paper or
in situ
grown ZnO-based sensing films have been fabricated and applied in humidity sensing (RH<1%), detection of traces of water (<0.05% v/v) in various organic solvents, thermal imaging and as a thermometer.
Fast and sensitive detection of water molecules in organic solvents and gases remains an important challenge. Here, Pan and co-workers design a metal-organic framework capable of ultrafast and reversible water sensing by photoluminescence switching via an excited state intramolecular proton transfer mechanism.
Journal Article
A self-sustainable wearable multi-modular E-textile bioenergy microgrid system
Despite the fast development of various energy harvesting and storage devices, their judicious integration into efficient, autonomous, and sustainable wearable systems has not been widely explored. Here, we introduce the concept and design principles of e-textile microgrids by demonstrating a multi-module bioenergy microgrid system. Unlike earlier hybrid wearable systems, the presented e-textile microgrid relies solely on human activity to work synergistically, harvesting biochemical and biomechanical energy using sweat-based biofuel cells and triboelectric generators, and regulating the harvested energy via supercapacitors for high-power output. Through energy budgeting, the e-textile system can efficiently power liquid crystal displays continuously or a sweat sensor-electrochromic display system in pulsed sessions, with half the booting time and triple the runtime in a 10-min exercise session. Implementing “compatible form factors, commensurate performance, and complementary functionality” design principles, the flexible, textile-based bioenergy microgrid offers attractive prospects for the design and operation of efficient, sustainable, and autonomous wearable systems.
Though energy-harvesting wearable systems have been reported in the literature, their system design imposes limitations that hinder their overall performance. Here, the authors report a system-level wearable e-textile microgrid system that relies solely on human activity for energy harvesting.
Journal Article
Mental Health and Psychosocial Problems of Medical Health Workers during the COVID-19 Epidemic in China
Objective: We explored whether medical health workers had more psychosocial problems than nonmedical health workers during the COVID-19 outbreak. Methods: An online survey was run from February 19 to March 6, 2020; a total of 2,182 Chinese subjects participated. Mental health variables were assessed via the Insomnia Severity Index (ISI), the Symptom Check List-revised (SCL-90-R), and the Patient Health Questionnaire-4 (PHQ-4), which included a 2-item anxiety scale and a 2-item depression scale (PHQ-2). Results: Compared with nonmedical health workers (n = 1,255), medical health workers (n = 927) had a higher prevalence of insomnia (38.4 vs. 30.5%, p < 0.01), anxiety (13.0 vs. 8.5%, p < 0.01), depression (12.2 vs. 9.5%; p< 0.04), somatization (1.6 vs. 0.4%; p < 0.01), and obsessive-compulsive symptoms (5.3 vs. 2.2%; p < 0.01). They also had higher total scores of ISI, GAD-2, PHQ-2, and SCL-90-R obsessive-compulsive symptoms (p ≤ 0.01). Among medical health workers, having organic disease was an independent factor for insomnia, anxiety, depression, somatization, and obsessive-compulsive symptoms (p < 0.05 or 0.01). Living in rural areas, being female, and being at risk of contact with COVID-19 patients were the most common risk factors for insomnia, anxiety, obsessive-compulsive symptoms, and depression (p < 0.01 or 0.05). Among nonmedical health workers, having organic disease was a risk factor for insomnia, depression, and obsessive-compulsive symptoms (p < 0.01 or 0.05). Conclusions: During the COVID-19 outbreak, medical health workers had psychosocial problems and risk factors for developing them. They were in need of attention and recovery programs.
Journal Article
Base Station Selection for Hybrid TDOA/RTT/DOA Positioning in Mixed LOS/NLOS Environment
The fifth generation (5G) cellular communication system is designed to support Time Difference of Arrival (TDOA), Round-Trip Time (RTT), and Direction of Arrival (DOA) measurements for indoor positioning. To mitigate the positioning error caused by non-line-of-sight (NLOS), existing base station selection methods identify channel conditions and only use line-of-sight (LOS) signals for positioning. However, different selected base station combination would lead to a different geometric dilution of precision (GDOP), base station selection based only on channel condition is not fully applicable for the hybrid positioning. This paper derives the GDOP for the hybrid TDOA, RTT, and DOA positioning, and proposes a GDOP-assisted base station selection method, which is based on both channel conditions and GDOP value changes. The simulation shows that using the proposed base station selection method could lead to higher positioning accuracy than base station selection based only on channel condition. In the simulation, in the side region of the scenario, where the change of selected base station combination causes a notable increment in GDOP value, the positioning accuracy improvement caused by the proposed method is greater than that in the center region.
Journal Article
Homochiral D4-symmetric metal–organic cages from stereogenic Ru(II) metalloligands for effective enantioseparation of atropisomeric molecules
Absolute chiral environments are rare in regular polyhedral and prismatic architectures, but are achievable from self-assembly of metal–organic cages/containers (MOCs), which endow us with a promising ability to imitate natural organization systems to accomplish stereochemical recognition, catalysis and separation. Here we report a general assembly approach to homochiral MOCs with robust chemical viability suitable for various practical applications. A stepwise process for assembly of enantiopure
ΔΔΔΔΔΔΔΔ
- and
ΛΛΛΛΛΛΛΛ-
Pd
6
(RuL
3
)
8
MOCs is accomplished by pre-resolution of the
Δ
/
Λ
-Ru-metalloligand precursors. The obtained Pd–Ru bimetallic MOCs feature in large
D
4
-symmetric chiral space imposed by the predetermined Ru(II)-octahedral stereoconfigurations, which are substitutionally inert, stable, water-soluble and are capable of encapsulating a dozen guests per cage. Chiral resolution tests reveal diverse host–guest stereoselectivity towards different chiral molecules, which demonstrate enantioseparation ability for atropisomeric compounds with
C
2
symmetry. NMR studies indicate a distinctive resolution process depending on guest exchange dynamics, which is differentiable between host–guest diastereomers.
Homochiral molecular capsules offer potential applications in chiral separation and stereospecific catalysis. Here, by pre-resolution of
Δ/Λ
-metalloligand precursors, the authors are able to assemble enantiopure supramolecular cages capable of stereoselective host-guest behaviour.
Journal Article
The Use and Perception of Electronic Cigarettes and Snus among the U.S. Population
E-cigarettes have generated controversy in the tobacco control field similar to that of Swedish snus, which came to the U.S. market six years earlier. Some argue that e-cigarettes have great potential to help smokers quit regular cigarettes while others contend they should be banned for lack of safety and efficacy data. This study examined population data from the U.S.
A U.S. population survey with a national probability sample (N=10,041) was conducted (February 24 to March 8, 2012, before any major paid advertisement of e-cigarettes appeared on television). Survey respondents were asked if they had heard about e-cigarettes, where they had heard about them, whether they had used e-cigarettes or snus, how often they used them, and why they used them. Responses were weighted to represent the entire U.S. population.
A high proportion, 75.4%, reported having heard about e-cigarettes. Television ranked as the number one source of information, followed by \"in-person conversation\" and \"Internet.\" About 8.1% had tried e-cigarettes, and 1.4% were current users. These rates were twice those of snus (4.3% and 0.8%, respectively). Among current smokers, 32.2% had tried e-cigarettes, and 6.3% were current users. Over 80% of current e-cigarette users were non-daily users. Women were significantly more likely to have tried e-cigarettes than men. Those who had tried e-cigarettes were more likely than those who tried snus to report their products being safer than regular cigarettes (49.9% vs. 10.8%). Almost half (49.5%) of current smokers were susceptible to using e-cigarettes in the future.
That e-cigarettes have surpassed snus in adoption rate, even before any promotion by major tobacco companies, suggests that the former have tapped into smokers' intuitive preference for potentially harm-reducing products, probably due to the product design. E-cigarette use is likely to increase in the next few years.
Journal Article
A wearable cardiac ultrasound imager
Continuous imaging of cardiac functions is highly desirable for the assessment of long-term cardiovascular health, detection of acute cardiac dysfunction and clinical management of critically ill or surgical patients
1
–
4
. However, conventional non-invasive approaches to image the cardiac function cannot provide continuous measurements owing to device bulkiness
5
–
11
, and existing wearable cardiac devices can only capture signals on the skin
12
–
16
. Here we report a wearable ultrasonic device for continuous, real-time and direct cardiac function assessment. We introduce innovations in device design and material fabrication that improve the mechanical coupling between the device and human skin, allowing the left ventricle to be examined from different views during motion. We also develop a deep learning model that automatically extracts the left ventricular volume from the continuous image recording, yielding waveforms of key cardiac performance indices such as stroke volume, cardiac output and ejection fraction. This technology enables dynamic wearable monitoring of cardiac performance with substantially improved accuracy in various environments.
Innovations in device design, material fabrication and deep learning are described, leading to a wearable ultrasound transducer capable of dynamic cardiac imaging in various environments and under different conditions.
Journal Article
Research on the Coordination of Fresh Food Supply Chain Based on the Perspective of Blockchain and Low Carbon
We consider a three-stage fresh agricultural product supply chain consisting of a supplier, a third-party logistics service provider (TPLSP), and a retailer and discuss the coordination mechanism of “revenue sharing + double cost sharing” contracts and “two-part tariff + revenue sharing + double cost sharing” contracts between the supplier, TPLSP, and the retailer. Based on this, we not only explore the conditions for supply chain full coordination and Pareto improvement but also analyze the effect of blockchain technology application cost, consumer environmental protection awareness, freshness preference, green trust level on carbon emission reduction level, fresh-keeping effort level, price decisions, and profits by comparing three different decision-making models. Results show that the improvement of the green trust level can help to improve the carbon emission reduction level, fresh-keeping effort level, price decisions, and profits. The application of blockchain technology can reduce transaction costs and improve consumer green trust levels, thereby increasing market demand and profits. When environmental protection awareness and freshness preference are higher than a certain value, the unit retail price of fresh products under decentralized decision-making is the highest with the blockchain technology applied. TPLSP can increase the wholesale, service, and retail prices of fresh products by appropriately increasing the blockchain technology application cost-sharing ratio. When 15
Journal Article