高速双光谱遥感图像传输系统

提出并设计了一种高速舣光谱遥感图像传输系统.对该系统所采用的传输策略,传输帧结构以及时序恢复等问题进行了深入的研究.首先,将双探测器一行数据中有效部分提取后传输,采用行有效标志中断发送的方式在接收端恢复时序,保证了系统输入输出数据、时序的完全一致;接着,采用发送与接收缓存机制,利用时分复用打法将双探测器的数据在单根光纤...     

新型罗丹明B席夫碱荧光探针的光谱性质研究

合成了一种席夫碱结构的罗丹明B衍生物.研究表明,该衍生物能与Fe3+形成稳定配合物,同时伴随显著的荧光增敏和吸收增强.衍生物不仅对Fe3+呈现良好的荧光及比色探针性能,其与金属离子形成的配合物也是一种研究牛血清白蛋白的高灵敏荧光探钊.     

有限长带电导体直线的电荷分布

通过3种方式给出有限长带电导体直线的电荷密度分布,结果表明电荷分布并不均匀.     

X-Y振镜扫描式舌诊高光谱采集系统

针对目前舌诊研究中在舌体信息全面获取方面存在严重不足,将高光谱技术用到舌诊的研究中来,提出了一种基于X-Y振镜扫描式舌诊高光谱采集系统.通过模拟实验,采集与舌体大小相似图片的高光谱信息,验证了该系统可以用于舌体高光谱信息采集,实验结果表明,与现有舌诊客观化研究相比,该系统可以获得更多的舌体信息,为舌诊客观化研究提供了一...     

Make-or-buy service capacity decision in a supply chain providing after-sales service

We consider a supply chain comprising a manufacturer and a retailer. The manufacturer supplies a product to the retailer, while the retailer sells the product bundled with after-sales service to consumers in a fully competitive market. The sales volume is affected by the retailer’s service-level commitment. The retailer can build service capacity in-house at a deterministic price before service demand is realized, or buy the service from an outsourcing market at an uncertain price after service demand realization. We find that the outsourcing market encourages the retailer to make a higher level of service commitment, while prompting the manufacturer to reduce the wholesale price, resulting in more demand realization. We analyze how the expected cost of the service in the outsourcing market and the retailer’s risk attitude affect the decisions of both parties. We derive the conditions under which the retailer is willing to build service capacity in-house and under which it will buy the service from the outsourcing market. Moreover, we find that the manufacturer’s sharing with the retailer the cost to build service capacity improves the profits of both parties.     

第一类弱奇异核Fredholm积分方程的数值求解

第一类弱奇异核Fredholm积分方程由于奇异及本质的不适定性,给求解带来很大难度．本文首先利用克雷斯变换将方程转化,并对转化后的方程进行高斯一勒让德离散,得到一离散不适定的线性方程组,结合正则化方法对该类问题进行数值求解．最后给出了数值模拟,验证了本文方法的可行性及有效性．     

Non-Positive Curvature and Global Invertibility of Maps

Let F:M→N be a C ¹ map between Riemannian manifolds of the same dimension, M complete, N Cartan–Hadamard. We show that F is a C ¹ diffeomorphism if inf _x∈M |d(B _ζ °F)(x)|>0 for all ζ∈N(∞) and Busemann functions B _ζ . This generalizes the Cartan–Hadamard theorem and the Hadamard invertibility criterion, which requires inf _x∈M ∥DF(x)^?1∥^?1=inf _ζ∈N(∞)inf _x∈M |d(B _ζ °F)(x)|>0. Our proofs use a version of the shooting method for two-point boundary value problems. These ideas lead to new results about the size of the critical set of a function f∈C ²(? ⁿ ,?): a) If \(\inf_{x\in \mathbb{R}^{n}}|\operatorname{Hess} f(x)v|>0\) for all v≠0 then the function f has precisely one critical point. (b) If g∈C ²(? ⁿ ,?) is the C ¹ local uniform limit of functions as in a), and \(\operatorname{Hess} g(x)\) is nowhere singular, then g has at most one critical point. The totality of functions described in (b) properly contains the class consisting of all C ² strictly convex functions defined on ? ⁿ .     

A unified proof on the partial regularity for suitable weak solutions of non-stationary and stationary Navier–Stokes equations

The partial regularity of the suitable weak solutions to the Navier–Stokes equations in Rⁿ${\mathbb{R}}^n$ with n=2,3,4$n=2,3,4$ and the stationary Navier–Stokes equations in Rⁿ${\mathbb{R}}^n$ for n=2,3,4,5,6$n=2,3,4,5,6$ are investigated in this paper. Using some elementary observation of these equations together with De Giorgi iteration method, we present a unified proof on the results of Caffarelli, Kohn and Nirenberg [1], Struwe [17], Dong and Du [5], and Dong and Strain [7]. Particularly, we obtain the partial regularity of the suitable weak solutions to the 4d non-stationary Navier–Stokes equations, which improves the previous result of [5], where Dong and Du studied the partial regularity of smooth solutions of the 4d Navier–Stokes equations at the first blow-up time.