摘要：The balanced operational amplifier including its merits and designing methods is discussed by comparing its performance to a conventional differential output amplifier when used in a single balanced stage. A balanced OTA circuit design is also presented.

摘要：In this paper three Banach spaces A(ф),A(ф)and A~1(ф)of functions holomor- phic in the unit ball B of ■~n are *** exhibit bounded projections from C(B)onto A(ф),from L~1(B)onto A~1(ф),and from L~∞(B)onto A(ф).Using these projections,we show that A(ф)~*≌A~1(ф)and A~1(ф)~*≌A(ф).

摘要：The design of an L_1 adaptive controller for hypersonic formation flight is presented. The traditional leader/wingman formation control problem is considered, with focused attention on dealing with the input disturbance and parametric variations, both of which are intrinsic properties of the system that result in undesired control performance. A proportional-derivative control scheme based on nonlinear dynamic inversion is implemented as the baseline controller, and an L_1 adaptive controller is augmented to the baseline controller to attenuate the effects of input disturbance and parametric variations. Simulation results illustrate the effectiveness of the proposed control scheme.

摘要：From the perturbation around the background spacetimes in the Gauss Bonnet gravity, we find the physical evidence that Ricci fiat AdS black holes and AdS solitons are different physical configurations and stay in different phases, this serves as a strong support to the previous mathematical and thermodynamieal arguments.

摘要：Hard-magnetic soft materials have attracted broad interests because of their flexible programmability,non-contact activation and rapid response in various applications such as soft robotics,biomedical devices and flexible *** multifunctional materials consist of a soft matrix embedded with hard-magnetic particles,and can exhibit large deformations under external magnetic ***,we develop a three-dimensional(3D)rod model to predict spatial deformations(extension,bending and twist)of slender hard-magnetic *** model follows Kirchhoff hypothesis and thus reduces the 3D magneto-elastic energy function to a one-dimensional(1D)***,the co-rotational formulation is applied to describe rigid body motion,and explicit time integration is adopted for the nonlinear ***,we explore finite bending,post-buckling and twisting of hard-magnetic elastica under external magnetic fields with different directions and *** examples with various configurations show superior efficiency and accuracy of the model(the difference less than 1%with only a small number of elements)compared to conventional solid *** model could be used to guide rational designs on programmable shape morphing of ferromagnetic slender structures.

摘要：This paper presents a practical concurrency control mechanism - ObjectLockingin OODBMS. Object-Locking can schedule transactions, each of themcan be considered as a sequence of high level operations defined on classes. Bythe properties of parallelity and coatativity between high level operations,proper lock modes for each operation are desigued and the compatibility matrixis constructed. With these lock modes, phatoms are kept away from databasesand a high degree of concurrency is achieved.

摘要：A novel FPGA chip FDP2008 （fudan Programmable Logic） has been designed and implemented with the SMIC 0.18μm CMOS logic 1P6M process. The new design method means that the configurable logic block can be configured as distributed RAM and a shift register. A universal programmable routing circuit is also presented; by adopting offset lines, complementary hanged end-lines and MUX ＋ Buffer routing switches, the whole FPGA chip is highly repeatable, and the signal delay is uniform and predictable over the total chip. A standard configuration interface SPI is added in the configuration circuit, and a group of highly sensitive amplifiers is used to magnify the read back data. FDP2008 contains 20 ×30 logic TILEs, 200 programmable IOBs and 10 × 4 kbit dual port block RAMs. The hardware software cooperation test shows that FDP2008 works correctly and efficiently.

摘要：This paper presents a universal field programmable gate array（FPGA） programmable routing circuit,focusing primarily on a delay *** the precondition of the routing resource＇s flexibility and routability,the number of programmable interconnect points（PIP） is reduced,and a multiplexer（MUX） plus a BUFFER structure is adopted as the programmable ***,the method of offset lines and the method of complementary hanged end-lines are applied to the TILE routing circuit and the I/O routing circuit,*** of the above features ensure that the whole FPGA chip is highly repeatable,and the signal delay is uniform and predictable over the total ***,the BUFFER driver is optimized to decrease the signal delay by up to 5%.The proposed routing circuit is applied to the fudan programmable device（FDP） FPGA,which has been taped out with an SMIC 0.18-μm logic 1P6M *** test result shows that the programmable routing resource works correctly,and the signal delay over the chip is highly uniform and predictable.

摘要：With the progress of high-bypass turbofan and the innovation of silencing nacelle in engine noise reduction, airframe noise has now become another important sound source besides the engine noise. Thus, reducing airframe noise makes a great contribution to the overall noise reduction of a civil aircraft. However, reducing airframe noise often leads to aerodynamic performance loss in the meantime. In this case, an approach based on artificial neural network is introduced. An established database serves as a basis and the training sample of a back propagation （BP） artificial neural network, which uses confidence coefficient reasoning method for optimization later on. Then the most satisfactory configuration is selected for validating computations through the trained BP network. On the basis of the artificial neural network approach, an optimization pro- cess of slat cove filler （SCF） for high lift devices （HLD） on the Trap Wing is presented. Aerody- namic performance of both the baseline and optimized configurations is investigated through unsteady detached eddy simulations （DES）, and a hybrid method, which combines unsteady DES method with acoustic analogy theory, is employed to validate the noise reduction effect. The numerical results indicate not merely a significant airframe noise reduction effect but also excellent aerodynamic performance retention simultaneously.

摘要：A novel toggled flip-flop（TFF） divide-by-two circuit（DTC） and its optimization method based on a large-signal analysis approach are *** reducing the output RC constant in tracking mode and making it large in latching mode,compressing the internal signal swing as well as compensating the current leaked in the latching mode, the operating frequency range is greatly *** in a SMIC 0.13μm RF CMOS process with a 1.2 V power supply,it can work under an ultra-wide frequency band ranging from 320 MHz to 29.6 *** results show that two phase-locked loops（PLLs） with the proposed DTC can achieve in-band phase noise of-94 dBc/Hz @ 10 kHz under 4224 MHz operating frequency and-84 dBc/Hz @ 10 kHz under 10 GHz operating frequency,respectively. The power consumption of the proposed DTC is reduced by almost 50%compared with the conventional counterparts.