摘要：Interpolating a set of planar points is a common problem in CAD. Most constructions of interpolation functions are based on the parameters at the sample points. Assigning parameters to all sample points is a vital step before constructing interpolation functions. The most widely used parameterization method is accumulative chord length parameterization. In this paper, we give out a better method based on the interpolation of conics. Based on this method, a sequence of fairer Hermite curves can be constructed.

摘要：Generation of Product Concept needs to give full play to the designers' innovative potential and collaborative work of experts in different fields. However, the collaborative innovative capabilities of geographically distributed designers are often limited and hindered by space and time. Therefore, on the basis of the requirements analysis of Internet based collaborative conceptual design and the research work we have done, this paper proposes the overall framework of supporting collaborative conceptual design on Internet. Based on this overall framework, the authors further put forward collaborative conceptual design process model that includes three stages: concept generation, concept communication and optimal product concept selection. At the end of the paper, the experiment environment of collaborative design is described. The overall framework and collaborative conceptual design process model proposed can take full advantage of Internet and give full play to experts' experiences and wisdom, so that the rapid development and innovative design of product can be provided with effectively and efficiently implemental mode and support on Internet.

摘要：Rapid technological development and population growth are responsible for a series of imminent environmental problems and an ineluctable energy *** application of semiconductor nanomaterials in photocatalysis or photoelectrocatalysis(PEC)for either the degradation of contaminants in the environment or the generation of hydrogen as clean fuel is an effective approach to alleviate these ***,the efficiency of such processes remains suboptimal for real *** construction of a built-in electric field is considered to efficiently enhance carrier separation and reduce carrier recombination to improve catalytic *** the past decade,as a new method to enhance the built-in electric field,the piezoelectric effect from piezoelectric materials has been extensively *** this review,we provide an overview of the properties of piezoelectric materials and the mechanisms of piezoelectricity and ferroelectricity for a built-in electric ***,piezoelectric and ferroelectric polarization regulated built-in electric fields that mediate catalysis are ***,the applications of piezoelectric semiconductor materials are also highlighted,including degradation of pollutants,bacteria disinfection,water splitting for H2 generation,and organic *** conclude by discussing the challenges in the field and the exciting opportunities to further improve piezo-catalytic efficiency.

摘要：Flexible supercapacitors(SCs)have become a popular research topic due to their extra-long service life,foldability,and ***,their low energy density restricts their ***,we synthesized phosphorus-doped bimetallic sulfides embedded in heteroatom-doped(N,S,and P)carbon shells(P-ZCS/HC)using a simple approach to create high-performance flexible *** three-dimensional architecture made by interlaced nanosheets was preserved,and raised nanoparticles appeared on the rough surface during the annealing operation,increasing the specific surface area and potential exposure to the *** is noteworthy that the optimal P-ZCS/HC electrode possessed a remarkable capacity of 1080 C g^(-1)at 1 A g^(-1)along with superb cycling *** extraordinary properties were primarily caused by plentiful redox reactions,enhanced conductivity,and synergic effects of the P-doped metal sulfides and heteroatom-doped carbon *** functional theory simulations confirmed the good function of the P-doped electrodes and their ability to boost conductivity,improve reactive dynamics,and promote ***,the assembled all-solid-state hybrid SC exhibited a maximum energy density of 62.9 W h kg^(-1)and a power density of 16 k W kg^(-1),while being able to maintain 92.0%of its initial capacity after 10,000 *** systematic report provides new insight into the design and synthesis of electrodes with complex components and outstanding structures for the flexible energy field.

摘要：Image enhancement plays an important role in many applications of medical imaging. Image enhancement technologies can improve the qualities of medical images with low contrast and high level noise by stretching contrast, suppressing noise and so on. Such images processed by image enhancement technologies are helpful to doctors in analyses and diagnoses. In this paper, we present a technical review of various existing image enhancement methodologies which are often emoloved.

摘要：目的:基于常用的数值模拟软件FLAC^(3D)进行二次开发,弥补现有数值模拟方法的缺陷,提出一种准确有效的隧道/巷道拱架支护数值模拟方法。创新点:1.引入抗弯和抗压能力的相关性,改进梁单元压弯极限判据;2.通过FISH语言编程,实现梁单元修正和拱架精确模拟。方法:1.通过对FLAC^(3D)中梁单元支撑理论的分析,明确其存在的缺陷,并利用算例进行证实(图4~6);2.基于传统强度理论,对梁单元现有压弯极限判据进行改进(图7和8);3.通过FISH语言编程,实现梁单元修正模型嵌入(图9);4.通过算例分析,对新模拟方法的效果进行验证(图10和13)。结论:1.改进了梁单元压弯极限判据,通过FISH语言编程实现了梁单元的修正及拱架屈服失效的模拟。2.构件压弯试验和巷道拱架支护实例分析表明:修正模型体现了在压弯组合荷载作用下梁单元屈服时弯矩和轴力的相关性;实现程序是有效的且灵敏度较高;提出的新模拟方法使计算偏差得到有效压制,拱架模型呈现出的力学行为及围岩支护作用更加接近实际,计算精度和设计可靠度更高。

摘要：A special PLC is designed for the control system of garbage truck,based on the feature and applications of vehicular electrical *** purpose is developing a kind of mature products to control the hydraulic *** general design plans are described,in detail,and the design points are analyzed and summarized.

摘要：The one-pot assembly reaction of a trilacunary,lone-pair-containing[B-α-SbW9O33]*** with Co2+ions in an aqueous medium led to the isolation of a novel{SbO3(H2O)3}bridging,dicobalt-substituted,sandwich-type tungstoantimonate{Co2Sb2(H2O)10[B-β-SbW9O33]2}^4–(1a).This compound was structurally characterized in the solid state by single-crystal X-ray diffraction,elemental analyses,thermogravimetric analysis,and IR *** most remarkable feature was that 1a comprises two trilacunary[B-β-SbW9O33]9^-fragments trapping a novel,centrally symmetric,rhomb-like{Co2Sb2}belt with 10 terminal water *** combined with the photosensitizer[Ru(bpy)3]^2+and the sacrificial electron acceptor S2O82.,1a exhibited efficient catalytic activity for water oxidation with a remarkable turnover number(TON)of 193,initial turnover frequency(TOFinitial)of 5.3 s^-1,O2 yield of 30.8%,and quantum yield(ФQY)of 36.2%under light-driven conditions.

摘要：针对地板生产设备大多数处于半自动化状态,且存在着加工精度和加工效率不高等缺陷,提出了强化地板数控横向开榫机主机结构的设计。通过对横向开榫机加工工艺分析,利用三维软件solirlworks对强化地板数控横向开榫机主机结构进行实体建模,确定了强化地板数控横向开榫机主机总体结构,并对齐边锯、粗铣的切削力和切削功率进行设计计算,完成了强化地板数控横向开榫机粗铣主轴件、齐边锯组件、精铣主轴件、抛光主轴组件、主机机架等结构的设计研究。设计的强化地板数控横向开榫机主轴结构简单,具有强度高、加工效率高、稳定性较好、制造成本低的优点。

摘要：In this paper,we utilize the variational limiting equilibrium(LE) procedure to theoretically determine the slope stability of homogeneous coral sand in the South China *** establishing a reasonable functional and calculating its extremum,we can deduce the stability factor of a coral reef identical to that obtained by upper bound *** determine the accuracy of the results obtained using the variational LE procedure,we present some classical examples of homogeneous sand slopes without a hard shell and compare our results with those obtained by the upper bound theorem of plasticity.A series of extensive calculations and comparisons reveal that the results obtained by our proposed analysis method and those obtained using classical methods are slightly different,but the variational results are *** the other hand,our method solves some stability factors for reef slopes covered with a hard shell,which indicates that the existence of a hard reef shell may significantly enhance the stability of a reef slope,and that there is strong nonlinear relationship between reef stability and the mechanical characteristics of the reef shell,such as its thickness and ***,based on the variational results presented in this paper,we present a useful chart that offers a convenient and straightforward way to determine the maximum stability factor of reef *** into account the influence of the hard reef shell,we found that,in some limit equilibrium cases,the limit stability factor and critical height of a coral slope could be improved ***,this issue deserves careful attention in engineering practice.