摘要：An equivalent corrugation pitch-modulated （ECPM） distributed feedback （DFB） semiconductor laser with two equivalently assisted phase shifts （EAPS） was theoretically studied and experimentally demonstrated. The simulated results showed that the longitudinal photon density distribution of the ECPM ＋ EAPS DFB lasers was much more uniform than that of a sole ECPM DFB laser without EAPS, and the longitudinal spatial hole burning was therefore suppressed more effectively. The results of experiment showed that good single longitudinal mode operation was achieved, with side mode suppression ratio （SMSR） being over 35 dB, and the wavelength range was from 1,559.64 to 1,563.02 nm when the operation current was from 50 to 160 mA at the temperature of 25 ℃, and the SMSR increased to 46.29 dB when the injection current was 130 mA.

摘要：Based on the helix rotating screen and the digital micro-mirror device （DMD）, the former proto of volumetric-swept display system is improved. The 3-D display system adopting a helix rotating screen to construct an imaging space meliorate the defects, such as the smaller image space, the fewer voxels and the severer voxel overlap dead zone caused by planar rotating screen. DMD with spatial light modular （SLM） technology increases the transmission bandwidth of 3-D data in the voxel activation subsystem and activate multi-voxel once time. The volumetric-swept system based on helix rotating screen and DMD is developed. The experimental results show that the image space, the vision dead zone, the voxels on slice, and the voxel activation capacity of the designed proto are superior to the plane rotating screen system.

摘要：Based on the height of back-filled materials, thickness of ore body, height of boundary pillar and dipping angle of ore body and water pressure, the safety factors of all the pillars are calculated with the limit equilibrium method. The calculation results present that the safety factors of pillars in Sections 19, 20, 24, 28 are less than 1.3, and those of unstable sections are identified preliminarily. Further, a numerical investigation in Sections 18, 20, 22, 24, 25 and 28 implemented with numerical code RFPA20 is employed to further validate the pillar performance and the stability of stopes. The numerical results show the pillars in Sections 18, 22 and 24 are stable and the designed pillar size is suitable. The width of the ore body near Section 28 averages 20 m, failure occurs in the left stope, but the boundary pillars near Section 28 maintain good performance. The pillars in Sections 20 and 25 are unstable which are mainly affected by the Faults F8 and F18. The existence of faults alters the stress distribution, failure mode and water inrush pathway. This work provides a meaningful standard for boundary pillar and stope design in a mine as it transitions from an open pit to underground.

摘要：A materials design tool for developing Pb-free soldering alloys in electronic package was developed based on comprehensive experimental data of phase equilibria and thermodynamic properties data accumulated with the CALPHAD (calculation of phase diagrams) method and contains 10 elements,namely,Ag,Au,Bi,Cu,In,Ni,Sb,Sn,Zn and *** can handle the calculation of phase diagrams in all combinations of these elements and all composition *** addition,based on this tool,the liquidus,solidus,phase fractions and constitutions,equilibrium and non-equilibrium solidification behavior,surface tension and viscosity of liquid,diffusion reactions and microstructural evolution,*** be *** examples of the calculation and application of this tool are *** design tool is expected to be a powerful tool for the development of Pb-free solders,as well as for promoting the understanding of the interfacial phenomena between Cu substrate and Pb-free solders in electronic packaging technology.

摘要：To maximize the throughput of frequency-selective multicast channel, the minimum-phase Finite Impulse Response (FIR) precoder design is investigated in this paper. This problem can be solved in two steps. Firstly, we focus on designing a nonminimum-phase FIR precoder under the criterion of maximizing the throughput, and develop two efficient algorithms for the FIR precoder design from perspectives of frequency domain and time domain. In the second step, based on the theory of spectral factorization, the nonminimum-phase FIR precoder is transformed into the corresponding minimum-phase FIR precoder by a classic iterative algorithm without affecting the throughput. Numerical results indicate that the achievable rate of the proposed design has remarkable improvement over that of existing schemes, moreover, the group delay introduced by the FIR precoder is minimized.

摘要：Antibody-based fusion proteins are the next generation of antibody therapies for cancer and other ***20 antigen,which is overexpressed on cell membranes in nearly 95% of cases of B-cell Non-Hodgkin's Lymphoma,is an attractive target for the therapy of B-lymphoid *** (LDM) is a potent enediyne-containing antitumor antibiotic that now has entered phase II clinical *** this study,we prepared an engineered fusion protein,scFv-LDP,consisting of an anti-CD20 scFv fragment and the apoprotein LDP of LDM using DNA *** purification and refolding,scFv-LDP was found to bind specifically to CD20-positive lymphoma cells using ELISA and indirect immunofluorescent cytochemical staining *** energized fusion protein scFv-LDP-AE was obtained using molecular reconstitution of the active chromophore AE of LDM and *** assay revealed potent cytotoxicity of scFv-LDP-AE to CD20-positive Raji and Daudi cells,with IC 50 values of 1.21×10-11 and 6.24×10-11 mol L-1,*** in vivo subcutaneous xenograft model of CD20-positive B cell lymphoma in BALB/c (nu/nu) mice was also *** were given intravenously on day 14 and 21 after tumor *** terms of maximal tolerated doses,scFv-LDP-AE at 0.3 mg kg-1 suppressed tumor growth by 79.3%,and LDM at 0.05 mg kg-1 by 68.6% (P<0.05).Results suggested scFv-LDP-AE could be a potential candidate for tumor-targeting therapy.

摘要：机动车污染物排放是我国大气复合污染形成的重要原因之一.尽管柴油车在我国机动车保有量中所占比例不到20%,但其排放的颗粒污染物(PM)和氮氧化物(NO x)分担率均超过60%.因此,控制柴油车尾气排放成为我国亟待解决的大气污染问题.目前,氨选择性催化还原NOx技术(NH3-SCR)已规模化应用于柴油车污染排放控制,出于安全性考虑,以尿素水溶液作为氨的来源.但NH3-SCR技术应用于柴油车尾气净化存在如下缺点:需要布建庞大的尿素添加基础设施、后处理系统复杂等.与此相反,以车载燃油为还原剂来源的HC-SCR技术可有效规避上述难题,展现了较好的应用前景.但是,直接以柴油为还原剂时,HC-SCR对NO x净化的效率还难以满足日益严格的排放法规的要求,因此需要深入研究HC选择性还原NOx的微观机制与构效关系,并以此为指导,发展以车载燃料为还原剂来源的高效净化NOx的新原理和新方法.已有的研究表明,银/氧化铝(Ag/Al2O3)具有优异的催化乙醇选择性还原NOx的能力,是最有希望应用于柴油车尾气NOx净化的催化剂-还原剂组合体系.鉴于此,本论文以Ag/Al2O3催化剂上乙醇-SCR反应为研究对象,以密度泛函理论计算方法(DFT)搭建了Ag/Al2O3催化剂的理论模型,考察了反应物乙醇(CH3CH2OH)、关键中间体(烯醇式物种CH2=CHO-和-NCO)在Ag/Al2O3催化剂上的吸附特征,采用电子态密度分析(DOS)研究了以上物种被活化的电子机制,以期甄别Ag/Al2O3催化乙醇选择性还原NOx的活性位结构,为高性能的HC-SCR催化剂设计提供指导.依据化学态的不同,Ag/Al2O3催化剂上活性组分银可分为:高度分散的离子态(Ag+、在催化剂表面以Ag-O形式存在)、部分氧化团簇(Ag nδ+)和金属颗粒银(Ag n0),其中氧化态的银是催化乙醇选择性还原NOx的活性组分.Al2O3载体的主要暴露晶面为(110)和(100),在上述晶面上Al的配位状态存在明显差异,显著影响了银物种的锚定与分散,形成了具有不同键合特征的Ag-O-Al结构.基于对Al2O3暴露晶面上Al配位状态的分析,搭建了6种Ag-O-Al结构模型.结合Al MAS NMR对Ag/Al2O3实际催化剂的表征结果和理论模型吸附能的分析,获得了最为可能的两种Ag-O-Al结构:Ag-O-Al tetra(Al O4)和Ag-O-Al octa(Al O6);前者为AgO与Al2O3(110)面Al trip位键合形成的特征结构(Al最终为四配位),后者系AgO锚定于Al2O3(100)面Al penta位的能量最优结构(Al最终为六配位).在Ag-O-Al tetra上,Al tetra位具有较强的酸性,Ag、Al原子轨道的杂化融合有利于电子转移;以上特性促进CH3CH2OH、CH2=CHO-、-NCO的吸附活化.在HC-SCR反应中,关键中间体-NCO通过与NOx直接反应可形成最终产物N2和CO2.可见,-NCO中N=C键的拉伸活化、断裂对上述反应的发生至关重要.由电子态密度分析可知,N=Cσ键能向Ag-O-Al tetra中Altetra位转移电子,而Ag与Al的轨道融合能反馈电子到N=Cπ键;在这两种电子转移机制作用下,-NCO中的N=C键被最大程度弱化,有利其断裂,转化为最终产物N2和CO2.而Ag-O-Alocta上,并没有N=C键的活化拉伸,反而呈现出N=C键收缩趋势,不利于N=C键的断裂与最终产物的形成.由此推定,Ag-O-Al tetra是Ag/Al2O3催化剂上HC-SCR反应的活性中心.

摘要：This paper describes the deployment optimization technology and the cross-layer design of a surveil-lance WSN system applied in relic *** the typical technical challenges in the applicationcontext of relic protection,we firstly propose a deployment technology based on ant colony optimization al-gorithm(DT-ACO)to overcome the difficulties in communication connectivity and sensing ***,DT-ACO minimizes the overall cost of the system as much as *** we proposea novel power-aware cross-layer scheme(PACS)to facilitate adjustable system lifetime and *** performance analysis shows that we achieve lower device cost,significant extension of thesystem lifetime and improvement on the data delivery rate compared with the traditional methods.

摘要：A biomimetic underwater vehicle propelled by two undulating long-fins is introduced in this paper. The concerned vehicle is propelled by two symmetrical undulating long-fins installed on both sides. Ten servo motors are employed to drive the long-fins and cosine wave function is employed for motor control. A real-time control system is designed for controlling the long-fins by adjusting its oscillating frequency and oscillating amplitude. An inertial measurement unit is installed to collect the accelerations and angular velocity. To obtain the relationship between oscillating frequency/amplitude and swimming performance, kinematic analysis and hydromechanic analysis are given. By dividing the long-fin into many small elements and computing the hydrodynamic force acting on each element, the instantaneous thrust generated by the long-fin is obtained. Then the average thrust of the long-fin is obtained by summing up the forces acted on the elements in one undulating period. Then swimming experiments are carried out to validate the vehicle design and kinematic analysis and hydromechanic analysis. And two swimming motion modes including marching and rotating locomotion are chosen. Finally, discussions between the swimming performance and the oscillating parameters are given.

摘要：Sodium ions(Na+) and ether electrolyte coinserted graphite possesses a considerable volume expansion effect. However, the mechanism fails to clearly explain its stability. In response to this deficiency, the co-inserted reaction is proposed, which is affected by the Lorentz force of the applied electric field under the high-current condition. The Na^(+) ions are separated out, while the ethylene glycol dimethyl ether molecules remain between the graphite layers. This insight provides a reasonable explanation for the extraordinary stability of this material. In situ X-ray diffraction and density functional theory calculations confirm the separation and release of Na+. On the basis of this result, unmodified commercial graphite was stably cycled 6400 times at a current density of up to 10 A g^(-1), and the capacity retention rate was as high as 97.2%. The full battery assembled in the laboratory has a maximum output power of 14,846 W kg^(-1)and an output energy density of 103 W h kg^(-1)(relative to the weight of anodic and cathodic active materials). The new mechanism provides innovative ideas for the design of large-scale energy storage devices.