摘要：A combination of hydrogels and microfluidics allows the construction of biomimetic three-dimensional(3D)tissue models in vitro,which are also known as *** hydrogel patterningwith awell-controlled spatial distribution is typically achieved by embedding sophisticated microstructures to act as a ***,these physical barriers inevitably expose cells/tissues to a less physiologically relevant microenvironment than in vivo ***,we present a novel dissolvable temporary barrier(DTB)strategy that allows robust and flexible hydrogel patterning with great freedom of design and desirable flow stimuli for cellular *** key aspect of this approach is the patterning of a water-soluble rigid barrier as a guiding path for the hydrogel using stencil printing technology,followed by a barrier-free medium perfusion after the dissolution of the *** and multiple tissue compartments with different geometries can be established using either straight or curved DTB *** effectiveness of this strategy is further validated by generating a 3D vascular network through vasculogenesis and angiogenesis using a vascularized microtumor *** a new proof-of-concept in vasculature-on-a-chip,DTB enables seamless contact between the hydrogel and the culture medium in closed microdevices,which is an improved protocol for the fabrication ofmultiorgan ***,we expect it to serve as a promising paradigm for organ-on-a-chip devices for the development of tumor vascularization and drug evaluation in the future preclinical studies.

摘要：The recent discovery and realizations of higher-order topological insulators enrich the fundamental studies on topological ***,we report three-dimensional(3D)wave-steering capabilities enabled by topological boundary states at three different orders in a 3D phononic crystal with nontrivial bulk topology originated from the synergy of mirror symmetry of the unit cell and a non-symmorphic glide symmetry of the *** multitude of topological states brings diverse possibilities of wave *** judicious engineering of the boundary modes,we experimentally demonstrate two functionalities at different dimensions:2D negative refraction of sound wave enabled by a firstorder topological surface state with negative dispersion,and a 3D acoustic interferometer leveraging on second-order topological hinge *** work showcases that topological modes at different orders promise diverse wave steering applications across different dimensions.

摘要：A high-performance concrete （HPC） is required to have superior performance in various aspects such as workability,strength, durability, dimensional stability, segregation stability, and passing ability. The mix design of HPC is rather complicatedbecause the number of ingredients in HPC is usually more than those in conventional concrete and some of the required propertiesare conflicting with each other in the sense that improvement in one property would at the same time cause impairment of anotherproperty. However, there is still lack of understanding regarding how the various mix parameters should be optimised forachieving best overall performance. Most practitioners are still conducting mix design primarily through trial concrete mixing,which is laborious, ineffective, and often unable to timely respond to fluctuations in the properties of raw materials. To addressthese issues, the authors have been developing the packing and film thickness theories of concrete materials, in order to revamp themix design philosophy of HPC in terms of the water film thickness （WFT）, paste film thickness （PFT）, and mortar film thickness（MFT） in the concrete. Based on the findings from an extensive experimental programme, suitable ranges ofWFT, PFT, and MFThave been recommended.

摘要：Rechargeable lithium-sulfur batteries have been regarded as the promising next generation energy storage system due to their overwhelming advantages in energy ***,their practical implementations are hindered by severe capacity fading and low sulfur utilization,which are caused by polysulfide shuttling and the insulating nature of ***,sulfur-embedded porous multichannel carbon nanofibers coated with MnO2 nanosheets(CNFs@S/MnO2)are rationally designed and fabricated as cathode for lithiumsulfur *** high conductivity of porous multichannel carbon nanofibers facilitates the kinetics of electron and ion transport in the electrodes,and the porous structure encapsulates and sequesters sulfur in its interior void space to physically retard the dissolution of high-order ***,the MnO2 shell exhibits a combination of physical and chemical adsorption for high-order polysulfides,which could sequester polysulfides leaked from the carbon matrix after long-time charge/discharge cycles,resulting in enhanced cyclic *** a result,the electrode delivers a specific capacity of 1286 m A h g^-1 at 0.1 C and 728 m A h g^-1 at 3 *** the capacity could remain 774 m A h g^-1 after 600 cycles at 1 C.

摘要：The urban developments have been carried out by only professionals for a long time because of efficiency and safety. However, most residents are ordinary people. Therefore, it is necessary to change the awareness of sustainable living environments, not only on the construction side but also the residents. In recent years, the number of cases of residents＇ participation in planning, maintaining, and repairing increased. However, sometimes youths and children, who might spend a lifetime longer than adults in a city after the developments have been done, are not included in this ＂Residents＂. Conceming youth and children＇s participation, CFC （child friendly city） is one of the good practices for sustainable development. It was launched by UNICEF （United Nations Intemational Children＇s Emergency Fund） and UN-Habitat in the Habitat II in 1996. City governments, especially in European countries, started to view CFC as their key concept for preservation and/or sustainable development. CFC means not only being ＂Children＂ friendly but also ＂All people＂ friendly. Various effects have been reported since the Historic Cities/districts included CFC in their city planning as a common concept, especially in education, community re-development, and operation and maintenance by the community. It is expected that better city planning in preservation and sustainable development can be achieved by adding CFC concept. In this research, an ideal way of city planning involving resident participation and the possibility in the future are analyzed based on case studies. Then a strategy of sustainable development and community planning involving youth and children＇s participation is proposed.

摘要：Etiquette （禮 Li, or ceremonial rules） is essentially a narrative symbol laden on human body （體 Ti）. The practice and belief in etiquette and body are observable points which cannot be ignored in genetics exploration of ＂etiquette＂. This article makees an archaeological excavation on ＂Li＂ （禮）,＂Ti＂ （體）, and the metaphorical meaning of such phrases as ＂ringing jade to show etiquette＂ （鸣玉以相 ）, ＂practicing etiquette by wearing jade＂ （佩玉践形） and so on.

摘要：The predictions of the multiple-regime flows from continuum regime to free molecular regime are crucial for the aerodynamic design in a large number of engineering applications,such as the near-space craft,the ultra-low orbit spacecraft and the micro-electro-mechanical systems(MEMS).Since the essence of this multiple-regime problem is a complex system composed by different scales and mechanics,the modeling and numerical prediction of these multiple-regime flows are very challenging at both theoretical and practical ***,the single flow field with multiple flow regimes will make the problem extremly ***,this typical flow field is very common in hypersonic application and important for the development of multiple-regime *** the other hand,both the constructions of the low density wind tunnel with high enthalpy and the high altitude flight experiment are also very challenging at the present ***,the researches on the multiple-regime flows and the corresponding complex science hit a worldwide *** paper reviews the breakthroughs in the computational methods for multiple-regime flows in the last ten years,which can be used as numerical experimental tools for studying the multiple-scale flow mechanism and providing data for aerodynamic designs and thermal *** paper focuses on the progress of the unified wave-particle methods established in recent years,which are proved to be both accurate and efficient for multiple-regime flows with extremly high speed.

摘要：Bismuth‐based photocatalysts are a class of excellent visible‐light photocatalysts;however,their redox activity is relatively poor and the efficiency of photogenerated carrier separation is low,limiting their development and application in the field of *** address these issues,a series of polyoxometalate PW_(12)O_(40)^(3–)‐doped Bi_(2)O_(3–x)/Bi Schottky photocatalysts PW_(12)@Bi_(2)O_(3–x)/Bi‐n(PBOB‐n,where n is the amount of NaBH4,i.e.,6,12,18,24,and 48 mg)were prepared by a simple electrospinning/calcination/in‐situ NaBH4 reduction *** this composite photocatalyst,the doping of PW_(12) could effectively adjust the electronic structure of Bi_(2)O_(3–x) and improve its redox *** a shallow electron trap,PW_(12) promoted the separation of the photogenerated ***,desirable Schottky junction between the metal Bi nanoparticles and PW_(12)@Bi_(2)O_(3–x) further accelerated the separation of the photogenerated *** synergistic effect of the aforementioned factors endowed PBOB‐n with excellent photocatalytic *** the samples,PBOB‐18 exhibited superior photocatalytic *** visible‐light irradiation,93.7%(20 mg catalyst)of 20 ppm tetrabromobisphenol A(TBBPA,20 mL)was degraded in 60 *** activity was 4.4 times higher than that of Bi_(2)O_(3).PBOB‐18 also exhibited an ultrahigh photocatalytic performance for the removal of *** removal rate(600 ppb)reached 83.3%in 30 min,making it one of the most active Bi‐based ***,the photocatalytic mechanisms of PBOB‐18 for TBBPA and NO have been *** work provides a new direction and reference for the design of low‐cost,efficient,stable,and versatile photocatalysts.

摘要：Temperature is a significant load on bridges,particularly for long-span steel box girder *** study investigates the temperature-induced static responses of a long-span suspension bridge under real service environmental conditions using numerical simulations and field *** 2 D finite element(FE)models of a typical section for the box girder,main cable,hanger,tower column,and crossbeam are *** thermal boundary conditions are determined strictly according to the surrounding environments of a typical sunny day and applied to the FE models.A transient heat-transfer analysis is performed and the time-dependent temperature and its distribution on the bridge are *** addition,a fine,3 D FE model of the bridge is developed for a structural *** calculated temperatures are applied to the 3 D model and the temperature-induced structural responses are *** simulated temperatures and the associated static responses have good agreement with the measured counterparts and support the numerical simulation *** main cable and bridge deck make the greatest contributions to the temperature effects on the suspension *** static responses of bridge caused by the design vehicle load are also *** daily variation of the temperature-induced static responses is comparable with,even higher than,that of the design vehicle load.

摘要：A WiFi-ZigBee hybrid BAN solution, namely WiZBAN, is proposed and implemented to cater for the development of high traffic AMI for smart grid application. It is important to highlight that the major challenge of WiZBAN is to handle the high density environment which results in heavy traffic loading and weak signal propagation. To overcome the captioned problem, Vertical Backbone Communication (VBC) and Horizontal Floor Communication (HFC) are defined for WiZBAN. The WiZBAN consists of WiZBAN Gateway (WiZGW), WiZBAN Meter Hub (WiZBAN) and WiZBAN In Home Display (WiZIHD) which caters for the smart grids services including smart metering and demand response. The WiZGW is the entrance of WiZBAN and connects WiZBAN to utilities. The WiZGW also teams up with WiZMH to enables VBC. On the other hand, WiZMH serves as the interception point of VBC and HFC. It interacts with smart meters and sets up the HFC together with WiZIHD to provide the user interface for end users. To shorten the transmission time, WiFi is adopted for VBC while ZigBee is applied to HCF to overcome the weak signal propagation. To investigate the performance of WiZBAN, a case study has been conducted based on an existing 23 floor residential building. From the measured and simulated results, the average round trip delay of demand response and smart metering are found to be 0.6 s and 9 s respectively.