surface

摘要： With the fast evolution of wireless and networking communication technology,applications of surface acoustic wave(SAW),or Rayleigh wave,resonators are proliferating with fast shrinking sizes and increasing frequencies.It is inevitable that the smaller resonators will be under a strong electric field with induced large deformation,which has to be described in wave propagation equations with the consideration of nonlinearity.In this study,the formal nonlinear equations of motion are constructed by introducing the nonlinear constitutive relation and strain components in a standard procedure,and the equations are simplified by the extended Galerkin method through the elimination of harmonics.The wave velocity of the nonlinear SAW is obtained from approximated nonlinear equations and boundary conditions through a rigorous solution procedure.It is shown that if the amplitude is small enough,the nonlinear results are consistent with the linear results,demonstrating an alternative procedure for nonlinear analysis of SAW devices working in nonlinear state.

摘要： The oxidative desulphurization(ODS)has become mainly popular by rapid catalytic oxidation of dibenzothiophene(DBT)relied on efficient heterogeneous catalyst,V-based catalytic active species were regarded as the potential option in the activity-preferred ODS systems.Herein,we reported the redispersion of vanadium oxide(VO_(χ))on the mesoporous silica modified with manganese oxide(Mn_(3)O_(4)) through one progressive insertion approach of metal oxides in the silica.Impressively,mesoporeencaged vanadium-manganese oxides in the silica(VMn-MS)as the admirable output of excellent ODS catalyst was demonstrated compared to other monometal-modified counterparts and one-pot implanted one.The characterization results revealed the post-implanted VO_(χ) species not only deposited around the pre-covered Mn_(3)O_(4) on the mesoporous surface but also inserted the surface layer of Mn_(3)O_(4) inducing the amorphous evolution of aggregated Mn_(3)O_(4) and the reconstruction of final active sites.This integrated approach made the reconstructed active species afford more exposed catalytic sites and the tailored surface redox cycles owing to the electronic communication of V-Mn.The catalytic results demonstrated the excellent catalytic desulphurization efficiency(~100%)during 60 min at 80°C,which made the sulphur content reduce to 6 mg·L^(-1),remarkably superior to other comparative samples.The outstanding catalytic performance of VMn-MS catalyst can be ascribed to the synergistic effect of V-Mn dual metals rendering two different reaction pathways,which includes free-radical reaction and ring-forming reaction,where Mn site acted as active center triggering reactive free radicals which could be further optimized by surrounded V sites around Mn sites to promote the ODS process.

摘要： 随着Windows 11系统的到来,微软推出了全新的Sur face硬件产品,包括Sur faceLaptop Studio、Surface Pro 8等,其中小巧便携的Surface Go 3二合一平板电脑深受出行办公人士的青睐。作为微软Surface Go系列产品的继任者,在全新的Windows 11系统的加持下,Surface Go 3能带来怎样的使用体验呢?

摘要： 本刊2022年第57卷第3期发表的论文《南昌地区无偿献血者梅毒抗体血清学检测结果及感染状况分析》中的(Enzyme-labeled Immunosorbeng Assay,ELISA)更正为(Enzyme-labeled Immunosorbent Assay,ELISA);(Hepatitis B Surface Antigin,HBsAg/TP)更正为“(Hepatitis B Surface Antigen/Anti-TP)HBsAg/TP。”

摘要： 笔记本与平板,Surface诞生以来便改变了这两种设备的泾渭分明的情况。所以每年微软发布Surface新品,都会引来大家对于新形态笔记本的探究。Surface Laptop Studio,是微软对产品形态的另一次探索,它通过对笔记本铰链的重新设计,带来了一款以与往我们所认识完全不同的新形态产品,也是微软当季的全新旗舰笔记本。

摘要： Elucidating the confinement effect harbours tremendous significance for isobutane alkylation with C_(4) olefin.Herein,the confinement effect over zeolite catalysts was elucidated by combining DFT calculations,experiments(using the novel Beta zeolite exposing only external surfaces(Beta-E)and conventional Beta-I zeolite with both external and internal surfaces)and multi-techniques(e.g.,TGA-DTG,HRTEM,SEM and XRD).It is found that the main active sites for C_(4) alkylation reaction are located on internal surface rather than external surface.On the external surface,the hydride transfer reaction does not occur because the H-shared intermediate cannot be formed without the confinement effect.Moreover,the external surface has stronger selectivity for C_(4) olefin adsorption than isobutane,leading to enhanced oligomerization reactions.Therefore,the suitable micropore with confinement effect is essential for zeolite-catalyzed C_(4) alkylation.The atomic-scale insights of this work are of great referential importance to the design of highly effective zeolite catalyst.

摘要： Sulfonic acid functionalized titanate nanotubes were prepared by the sulphonation reaction of hydrothermally synthesized TiO_(2) nanotubes(TNTs) using chlorosulfonic acid as the sulfating agent.The as-prepared catalysts were characterized by fourier transform infrared(FT-IR)spectroscopy,transmission electron microscopy(TEM),scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EDX),Xray diffraction(XRD) analysis,thermogravimetry-differential thermal gravimetry(TG-DTG) and X-ray photoelectron spectroscopy(XPS)techniques.The characterization results revealed that the catalysts retained the tubular structure of the TNTs and possessed a large number of active sulfonic acid sites.The catalytic performance of the catalysts for the synthesis of n-butyl levulinate was investigated via the alcoholysis of biomass-derived furfuryl alcohol under atmospheric pressure.The effects of the reaction factors such as the catalyst dosage,reaction time,and temperature on the alcoholysis of the furfuryl alcohol were systematically studied.Under mild conditions,about 79.9% yield of n-butyl levulinate was achieved.In addition,the catalysts showed a stable catalytic performance after four consecutive cycles.Furthermore,no leaching of the active species was observed during the hot filtration testing,which can be attributed to the covalently linked –SO_(3)H groups on the TNTs surface.In addition,the opened tubular nanostructure of the catalyst and the introduced strong Br?nsted acid sites exhibited synergistic effects,which facilitated the selective conversion of the furfuryl alcohol to butyl levulinate.

摘要： Traditional explosives have characteristics of high risk,large vibration,and poor directional fracturing.Consequently,an instantaneous expander with a single crack surface(IESCS),which is a novel nonexplosive directional rock-breaking technique,has been developed.The directional roof-cutting mechanism of the IESCS method,driven by high-pressure gas,was theoretically analyzed.Laboratory experiments and numerical simulations proved the directional slitting effect of the IESCS method to be excellent.Compared with shaped-charge blasting,the charge of IESCS was reduced by 8.9%,but the crack rate increased by 9%in field tests.After IESCS pre-splitting,the roof directionally collapsed along the cutting line,and the gangue filled the goaf.Moreover,the directional roof cutting by the IESCS could decrease roadway stress.The average pressure of hydraulic supports on the cutting side of the roof was 31%lower than that on the non-cutting side of the roof after pre-splitting.After the self-formed roadway constructed by the IESCS was stabilized,the final relative displacement of the roof and floor was 157.3 mm,meeting the required standard of the next working face.Thus,the IESCS was effectively applied to directional roof pre-splitting.The results demonstrate the promising potential of IESCS in the mining and geotechnical fields.

摘要： Transition-metal phosphides have been of concern as efficient electrocatalysts for oxygen evolution reaction(OER)due to its high conductivity and earth-abundance reserves.However,oxide overlayers formed on their surface by spontaneously atmospheric oxidation are usually neglected,thus confusing the establishment of structure–performance relationship.Herein,we successfully etched the oxide overlayers of NiFe phosphide(NiFeP)by a dielectric barrier discharge(DBD)plasma technique,aiming to reveal the influence of the oxide overlayers on its electrocatalytic performance for OER.It is found that etching the oxide overlayers can accelerate the surface reconstruction process of NiFeP and facilitate the formation of metal hydroxides,which are key intermediate phases for OER.Consequently,the etched NiFeP-DBD material shows remarkably enhanced OER activity with an overpotential of 265 mV at a current density of 10 mA cm^(-2).The finding of this work probably brings a significant impact to understand the structure–performance relationship of metal phosphide in electrooxidation reaction.

摘要： Extrinsic information,from satellite observations and the outputs of spatial models,and intrinsic information,from ground observations and spatial sampling,provide two different but complementary streams of information about the Earth’s surface.These extrinsic and intrinsic informations are indispensable for the modelling of the Earth’s surface systems along with an appropriate method for integrating these two kinds of information.Building on this idea,the fundamental theorem for Earth’s surface system modeling(FTESM)was proposed,from which several corollaries have been deduced,corresponding to spatial interpolation,spatial upscaling,spatial downscaling,data fusion and model-data assimilation,respectively(Yue et al.,2016).

摘要： 本发明公开了一种Gaussian‑Surface保边滤波算法、基于该Gaussian‑Surface保边滤波算法的显示屏Mura缺陷检测方法及其装置，包括对目标图像感兴趣区域的提取，重新构建背景图像，区域生长分割Mura缺陷，计算并标记Mura缺陷。本发明同时提供一种显示屏Mura缺陷检测装置，包括图像获取单元、图像预处理单元、图像提取单元、构建背景图像单元、分割Mura缺陷单元、标记Mura缺陷单元，通过对图像获取单元所获得的原图进行Gaussian‑Surface保边滤波处理后，再提取感兴趣区域，实现对主动发光型显示屏的边界精确界定，能够获取更加精准的发光区域边界位置，避免普通滤波算法实施后边界的模糊，造成边缘缺陷的漏检。

摘要： 本发明培育出导入基因仅在一部分细胞、例如花瓣的L1层的细胞等中存在，而在其他细胞、例如花粉细胞、胚珠细胞等的生殖细胞中不存在的月季。本发明的月季即使与其他月季杂交，导入基因也不会向其他月季转移，所以，可完全否定导入基因扩散的可能性。

摘要： 本实用新型涉及电子设备技术领域，且公开了一种Surface用拓展坞，包括拓展坞本体，所述拓展坞本体的一侧安装有USB插头，所述拓展坞本体的一侧安装有miniDP插头，所述拓展坞本体的顶部与底部均栓接有滑套，所述滑套的内部套接有U形件，所述U形件的内部安装有螺纹套，所述螺纹套的内部螺纹连接有限位螺栓，所述拓展坞本体的一侧安装有两个USB插口，所述拓展坞本体的一侧安装有网线插口；本实用新型通过将USB插头和miniDP插头与电脑插接，随后将U形件与电脑进行卡接，然后拧动限位螺栓，使限位螺栓通过螺纹套的配合进行移动，之后限位螺栓通过胶套的配合对拓展坞本体进行限位固定，从而能够有效避免使用者拉扯造成拓展坞本体松动。

摘要： 本实用新型属于机器人技术领域，尤其是涉及一种用于surface4机器人的控制装置。包括壳体，所述的壳体内设有控制电路板，所述的壳体和控制电路板之间设有减震机构，所述的减震机构包括设于控制电路板两侧的减震垫，所述的减震垫的一侧与壳体相贴合，减震垫的另一侧开有与控制电路板相配合的固定槽，所述的控制电路板的边缘插入到固定槽中，所述的壳体的外壁上设有缓冲垫，所述的缓冲垫的外表面上设有粘附结构，所述的粘附结构包括粘附层，所述的粘附层的上表面粘附有能够阻隔粘附层与其他物质粘附的防粘附膜，所述的防粘附膜通过连接条与其他固定配件相连接。优点在于：具有减震功能，且能够避免控制装置在地震环境中与地面多次撞击。