In this paper, an efficient direct data domain space-time adaptive processing (STAP) algorithm for moving targets detection is proposed, which is achieved based on the distinct spectrum features of clutter and target signals in the angle-Doppler domain. To reduce the computational complexity, the high-resolution angle-Doppler spectrum is obtained by finding the sparsest coefficients in the angle domain using the reduced-dimension data within each Doppler bin. Moreover, we will then present a knowledge-aided block-size detection algorithm that can discriminate between the moving targets and the clutter based on the extracted spectrum features. The feasibility and effectiveness of the proposed method are validated through both numerical simulations and raw data processing results.
This paper presents a method of software fault diagnosis based on program slicing and expert system.This method first analyze fault information.Then use coarse-grained diagnosis and fine-grained diagnosis,make certain the fault position of the software.Finally,it is necessary to make sure the correctness of modification.
The wound healing process is divided into four phases of hemostasis, inflammation, proliferation, and remodeling that each wound needs to go through to heal normally. Each phase is crucial to the healing of the wound. Herein, for the first time, we describe an emerging bifunctional hybrid fiber membrane of ZnO–Fe2O3/kaolinite nanoclay/poly-(3-caprolactone)-gelatin (ZnO–Fe2O3/Kaol/PG) that concurrently controls bleeding, prevents bacterial colonization, reduces excessive inflammation, and facilitates wound healing for the early emergency self-rescue. Topical treatment with the fiber membrane in bacteria-infected mice models could accelerate wound healing through reducing bacterial growth, and promote cell proliferation and neovascularization, which is attributed to the antibacterial and anti-inflammatory activity of ZnO–Fe2O3/Kaol. Kaolin can activate the intrinsic coagulation cascade, in addition, it can concentrate on blood platelets, RBCs, and clotting factors by absorbing fluid. Fe2O3 can facilitate RBC aggregation and clotting, while ZnO can mediate the inhibition of the release of pro-inflammatory cytokines and antibacterial effect. The fibrous architecture of PG electrostatically spun fibers can provide an appropriate environment for wound healing. Here, for the first time, we found that ZnO–Fe2O3/Kaol can control bleeding quickly for wound injury and protect the wound from external bacterial infection and reduces inflammation. The versatility and portability of the as-prepared hybrid fiber membrane make it an effective strategy for hemorrhage control and wound healing.
Acidithiobacillus ferrooxidans (A.f) is a Gram-negative chemolithotrophic bacterium capable of oxidizing ferrous iron, elemental sulfur and inorganic sulfur compounds. Fe(II)-oxidizing enzyme plays a key role in Fe(II)-oxidizing system. Different A.f strains, which were isolated and purified from various ecological niches, showed obviously phenotypic diversity in growth rate and oxidation of Fe~(2+). The Fe(II)-oxidizing enzyme gene(iro) in five strains was (identified) by PCR, then sequenced and aligned. The results revealed a putative highly variable region in CDS between the 187th and 195th bp. In strain YTW, positions of 187～189 corresponded to Thr→Pro; positions of 193～195 to Met→Asn in strain TK and to Met→Ile in strain BY. However, position of 219 corresponded to T→C in all strains. For upstream of CDS, sequences in all strains were identical to the GenBank sequence (E03451), but downstream of CDS, the sequences existed some variable sites.
The hinterland is very impartment to a port, so we must improve the scientific and rationality of the present port hinterland segmentation. This thesis chooses Newton Model as Empirical Methods, establishment of evaluation index system of the port gravitation. Then chooses Guangzhou port and Shenzhen port as the example the finally result is obtained with Multi-level fuzzy comprehensive evaluation method. It's easy to found that the hinterland distinction circle closer to the vertical bisector and hinterland division have to do with the distance between two ports in a more recent area. But the advantage of Shenzhen Port hinterland gradually emerges in the remote region.
The multi-sensor integrated navigation system is one of the developing directions of integrated naviga tion.Aiming at the complex environment,the multi-model adaptive algorithm can solve the problem of model and parameter uncertainty,and the multi-scale fusion algorithm which combines the dynamic system analysis method based on model with multi-scale signal transformation method having statistical characteristics can effec tively increase system’s filtering precision.Thus,in this paper,multi-model estimation was combined with multiscale filtering method to form multi-model and multi-scale filtering method.After this method was used to multi-sensor integrated navigation system,the simulated results showed that this method could increase system filtering precision more than multi-model algorithm and single-model multi-scale filtering method.
This paper analyzes the convergence rate of sample matrix inversion (SMI) filter used by array receivers in pulse interference environment. Firstly, the convergence characteristics of SMI filter under pulse interference are deduced, and the relationship between the convergence speed and length of training samples and duty of interference is given. Then, the results of signal simulation are consistent with those of numerical analysis, which verifies the correctness of theoretical analysis. The results show that the convergence speed of SMI filter decreases under pulse interference, and the SMI filter needs more training samples to suppress the pulse interference effectively.
The Stackelberg model is often used to study on the suck cost and the barriers to entry between the enterprises competition. The paper analyzes the situation of two port enterprises competition in the intra-regional by means of the Stackelberg model and the HSS. It studies on two port enterprises competition under the hypothesis of no fixed entry cost and with the fixed entry cost based on the features of them. The former reflects the first-mover advantage of the leading port; the later analyzes the monopoly condition of the leading port. Combined with the hub-and-spoke system (HSS), it also analyzes the first-mover advantage of the leading port enterprise. The paper studies on the competition of the regional hub port between Dalian port and Yingkou port in the Northeast of China. It can be got that Dalian port has the first-mover advantage significantly, and with the strengthening in the separation of enterprise from government, this advantage will make Dalian port take the monopoly position in the future.
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