一种基于强非局域正交直积态的新型量子密封投标拍卖协议

量子密封投标拍卖(Quantum sealed-bid auctions,QSA)作为一种特殊的交易形式在经济和金融领域有着重要的应用。利用一组强非局域正交直积(Strongly nonlocal orthogonal product,SNOP)态,提出了一种新型量子密封投标拍卖协议。在该协议中,不需要制备纠缠态,同时第三方拍卖中心不参与拍卖和验证过程,解决了第三方参与权限过大的问题,提高了协议的实用性。由于SNOP态的局域不可区分的特性,攻击者即使获得部分粒子也无法还原秘密信息,保证了协议的安全性。并且所有参与者都可以参与验证获胜者的出价,安全高效地解决了多方合谋的问题。安全性和完整性分析表明,该协议能够满足安全密封投标拍卖的所有要求,包括匿名性、公开可验证性、公平性、可追溯性、不可抵赖性和竞拍人的责任制。

利用正交直积态的量子密钥分配协议

基于量子密钥分配协议是目前实现密钥分配最安全的方法,两个三态量子位组成的复合系统中存在一组正交直积态,它可以表现出非定域性。该文提出了一个建立在该系统的非定域性基础上的量子密钥分配协议,协议双方通过交换量子位和集体测量建立起共享的密钥。量子力学的基本原理保证了该协议是无条件安全的,没有第三方可以窃取密钥而不被发现。该协议不需要纠缠态,也不需要做任何量子操作。因此,它更容易在实践中实现,同时具有更高的可靠性与健壮性。

一种基于局域不可区分正交直积态的新型量子保密求和协议

量子保密求和是量子安全计算的基础,目的是在保护参与者私有信息的前提下求出参与者秘密信息的和。提出了一种新型的量子保密求和协议,即以两体量子系统中的局域不可区分正交直积态作为载体,利用移位操作将秘密编码在正交直积态上,进而完成秘密求和。理论分析表明,本文所提出的协议可以确保正确性,即多个参与者最后可以成功计算出他们秘密的和。同时,协议的安全性可以得到保障,即无论是外部攻击者还是内部参与者都不能获得除自己的秘密与结果之外的任何信息。最后,对协议进行了进一步的分析和讨论,并对可能的研究方向进行了展望。

怀念“三诊大夫”温肇桐先生

今年元月二十三日中午,我刚从石子岗参加一位同志的"遗体告别会"归来,积寅递给我一份温肇桐逝世的讣告,并说,下午一时半学校有车子去常熟。我控制着感情奔回卧室,没等把房门掩好,就失声哭泣了。泪水滴入砚台,我不由自主地磨起墨来。隔了半个小时,我把一副墨迹(也可说是泪迹)未干的挽联送交积寅,托他带去常熟。这副挥泪捷书的挽联表达了我对这位卓有成就的美术史论家、美术教育家的悼念之情。

Electrodeposition of cobalt in double-membrane three-compartment electrolytic reactor

The process parameters were optimized for the electrodeposition of cobalt from cobalt chloride solution in the membrane electrolytic reactor. Effects of parameters such as catholyte composition, current density and temperature on the current efficiency, specific power consumption and quality of deposition were studied. The catholyte was a mixed solution of cobalt chloride, the initial middle electrolyte consisted of diluted hydrochloric acid, and the anolyte was sulfuric acid. An anion exchange membrane separated the catholyte from the middle electrolyte, and a cation exchange membrane separated the anolyte from the middle electrolyte. The results showed that a maximum current efficiency of 97.5% was attained under the optimum experimental condition of an catholyte composition of 80 g/L Co^2＋, 20 g/L H3BO3, 3 g/L NaF and pH of 4, at a cathode current density of 250 A/m2 and a temperature of 50 ℃ HCl could be produced in the middle compartment electrochemically up to 0.45 mol/L.

Fast alternating direction method of multipliers for total-variation-based image restoration

A novel algorithm, i.e. the fast alternating direction method of multipliers （ADMM）, is applied to solve the classical total-variation （ TV ）-based model for image reconstruction. First, the TV-based model is reformulated as a linear equality constrained problem where the objective function is separable. Then, by introducing the augmented Lagrangian function, the two variables are alternatively minimized by the Gauss-Seidel idea. Finally, the dual variable is updated. Because the approach makes full use of the special structure of the problem and decomposes the original problem into several low-dimensional sub-problems, the per iteration computational complexity of the approach is dominated by two fast Fourier transforms. Elementary experimental results indicate that the proposed approach is more stable and efficient compared with some state-of-the-art algorithms.

包头与阴山赵秦汉长城的关系初探

长城,是中国文化在中华大地上刻画出的一条深沉的、有形的线。它的高大绵长,存在的恒久,功能的显赫,影响的深远,是当今世界上任何其他文化遗留所无可比拟的。长城内外有许许多多的城市,如同中国文化景观的星辰,在太空中构成一幅幅美妙的图画。包头和它附近的赵、秦、汉长城,就构成了这许多画卷中动人的一幅。长城这条有形的文化界线,乃自然和人文的混合产物。换言之,也就是气侯、植被和人类经济活动所交积的巨大文化之索,成为草原游牧和定居农耕的分野。

Parallel Computation of Disjoint Products Approach

In this paper, extracting parallelizatio n from the sum of disjoint products approach is discussed. A general framework of parallelizing disjoint products approach is presented. And a parallel version of the newest disjoint products algorithm is implemented. The results of testing s how the effect is so good to get linear speedups.

一类偏序富足半群的结构

Blyth和McFadden讨论了具有最大幂等元的自然序富足半群的结构,得到一种分解方法:El-Qallali把此方法推广到一类quasi-adequate半群上.我们推广此方法,把它应用到满足正则性条件且含最大幂等元的自然序富足半群上,讨论了这类半群的结构.

试说“冓”与“構”

在郭锡良等人编著的《古代汉语》第一册词义分析举例(二)中,作者对“構”的分析中沿用了许慎以及朱骏声对“冓”的解释:“许慎说‘交积材也,象对交之形。’”“朱骏声解释为‘以木相架也’,并认为‘構’当为‘冓’的或体”(《古代汉语》第362页)。我认为这种解释是欠妥的。朱骏声的时代,甲骨文还没有被人们发现,那时人们对汉字研究的主要根据是许慎《说文解字》以及其中的9353个小篆(并有少量古文)。而许慎由于材料的局限。

Anodic behavior and microstructure of Al/Pb-Ag anode during zinc electrowinning

Anodic behaviors and oxygen evolution kinetics of Pb-0.8%Ag and Al/Pb-0.8%Ag anodes during the initial 24 h zinc electrowinning were investigated with cyclic voltammetry （CV） curves and electrochemical impedance spectroscopy （EIS）. The results reveal that the anodic behaviors and reaction kinetics of the two anodes vary a lot during the anodic polarization which indicate the formation and stabilization of anodic layer. Compared with conventional Pb-0.8%Ag anode, A1/Pb-0.8%Ag anode has longer time of anodic polarization. At the very beginning of anodic polarization, the two anodes all exhibit higher potential of oxygen evolution reaction （OER） since the reaction is controlled by the transformation step of intermediates. Then, its OER potential is largely diminished and OER rate is deduced from the formation and adsorption of the first intermediate （S-OHms）. In the prolonged anodie polarization, the anodie potential of A1/Pb-0.8%Ag gradually decreases and the final value is more stable than that of conventional Pb-0.8%Ag anode. On the anodic layer after 24 h of anodic polarization, the OER potential is controlled by the formation and adsorption of intermediate. The microstructures of A1/Pb-0.8%Ag and Pb-0.8%Ag anodes after 24 h of anodie polarization were analyzed by scanning electron microscope （SEM）.

Equivalence of crossed product of linear categories and generalized Maschke theorem

Some sufficient and necessary conditions are given for the equivalence between two crossed product actions of Hopf algebra H on the same linear category, and the Maschke theorem is generalized. Based on the result of the crossed product in the classic Hopf algebra theory, first, let A be a k-linear category and H be a Hopf algebra, and the two crossed products A#_σH and A#＇_σH are isomorphic under some conditions. Then, let A#_σH be a crossed product category for a finite dimensional and semisimple Hopf algebra H. If V is a left A#σH-module and WC V is a submodule such that W has a complement as a left A-module, then W has a complement as a A#_σH-module.

Construction of Accumulated Temperature Effect Model for Fertility Alteration of Two-line Sterile Line P88S

[Objective]The research aimed at constructing an accumulated temperature effect model for fertility alteration of two-line hybrid rice P88S.[Method]Analyze the experiment datas of fertility alteration of P88S in Hainan from 2005 to 2006.[Result]The fertilities of P88S with temperatures ranging from 26 to 28 ℃ were determined by the absolute values and the accumulation effects of the temperature.An accumulation effect model of temperatures based on the bistable state was obtained.[Conclusion]The temperature asymmetry of fertility alteration for two-line sterility line in spring and autumn can be elucidated effectively using the accumulated temperature effect model,namely,alternating from fertile to sterile requires higher temperatures,and alternating from sterile to fertile requires lower temperatures.

与群PSL_2(R)相关的交叉积R(A，α)的一点注记

在上半复平面H上给定双曲测度dxdy/y^2,群G=PSL_2(R)在H上的分式线性作用导出了G在Hilbert空间L^2(H,dxdy/y^2)上的酉表示α.证明了交叉积R(A,α)是Ⅰ型von Neumann代数,其中A={M_f:f∈L~∞(H,dxdy/y^2)}.具体地,交叉积代数R(A,α)与von Neumann代数B(L^2(P,ν))(?)~—LK是~*-同构的,其中LK是G中子群K的左正则表示生成的群von Neumann代数.

An efficient two-step quantum key distribution protocol with orthogonal product states

An efficient two-step quantum key distribution （QKD） protocol with orthogonal product states in the （×）（n ≥3） Hilbert space is presented. In this protocol, the particles in the orthogonal product states form two particle sequences. The sender, Alice, first sends one sequence to the receiver, Bob. After Bob receives the first particle sequence, Alice and Bob check eavesdropping by measuring a fraction of particles randomly chosen. After ensuring the security of the quantum channel, Alice sends the other particle sequence to Bob. By making an orthogonal measurement on the two particle sequences, Bob can obtain the information of the orthogonal product states sent by Alice. This protocol has many distinct features such as great capacity, high efficiency in that it uses all orthogonal product states in distributing the key except those chosen for checking eavesdroppers.

Constructing generalized Drinfel'd quantum double

Let H be a Hopf algebra and B an algebra with two linear maps δ, τ： H H→B. The necessary and sufficient conditions for the twisted crossed product B#^τδH equipped with the tensor product coalgebra structure to be a bialgebra are proved. Then, B#^τδH is a coquasitriangular Hopf algebra under certain conditions. This coquasitriangular Hopf algerbra generalizes some known cross products. Finally, as an application, an explicit example is given.

Paired bialgebras and braided bialgebras

First, we present semisimple properties of twisted products by means of constructing an algebra isomorphism between twisted products and crossed products, and point out that there exist some relations among braided bialgebras, paired bialgebras and Yang-Baxter coalgebras. Furthermore, we give an example to illustrate these relations by using Sweedler's 4-dimensional Hopf algebra. Finally, from starting off with Yang-Baxter coalgebras, we can construct some quadratic bialgebras such that they are braided bialgebras.

Comparions of Required Nitrogen Fertilizers by Hybrid Cultivar and Conventional Cultivar of Rapeseed(Brassica napus L.)

[Objective] The aim of this study was to understand the difference of N fertilizer requirement between hybrid rapeseed and conventional rapeseed. [Method] Two hybrid cultivars, ZY5628 and ZY7819, and the conventional cultivar ZS10, were compared through two field experiments. In Experiment 1, seed yield and optimum N application rate were assessed in the field with five N application treatments. In Expedment 2, N was applied uniformly at 180 kg/hm2, and plant biomass and N accumulation were measured at several developmental stages, while N use efficien- cy was calculated for rape at maturity. [Results] The experiment 1 results showed that seed yields of ZY5628 and ZY7819 were both significantly higher than that of ZS10, and compared to ZS10, optimum yield （plateau yield） was higher by 18.7% and 20.2%, while the recommended N application rate was lower by 9.5% and 9.6% for ZY5628 and ZY7819, respectively. The experiment 2 results showed that during vegetative development, all three cultivars exhibited similar accumulations of plant biomass and N, but through flowering and maturity ZY5628 and ZY7819 pro- duced more biomass, acquired more N, and utilized acquired N more efficiently to- wards seed production than ZS10. [Conclusion] With equivalent inputs, the hybrid rapeseed cultivars ZY5628 and ZY7819 tested herein yield more seed with higher N use efficiency than the conventional rapeseed ZS10. This information will be valu- able for growers seeking to improve efficiency while reducing costs of rape production in China.

Sediment Movement in Periodic Alternating Current

The present paper summarizes the results of previous studies, including the structure and principle of the rotary ring flume for researching the fine sediment movement, the mechanism of the flume, method of eliminating the influence of the centrifugal force and sediment movement experiments with periodic alternating current. Also included are the experiment-based relationship among sediment concentration, bed shear stress and silt carrying capacity, a proposed erosion-deposition function and bed erosion-deposition calculation together with the results of verification.

Benthic nutrient recycling in shallow coastal waters of the Bohai Sea

Sediment-water fluxes of N and P species in the Bohai Sea were investigated in Septem-ber-October 1998 and April-May 1999. The benthic fluxes of nutrient species were determined by incubating sediment core samples with bottom seawater bubbled with air or nitrogen. -2NO,+4NH, dissolved organic nitrogen (DON) and phosphorus (DOP), total dissolved nitrogen (TDN) and phosphorus (TDP), and -34PO showed a net exchange flux from seawater to sediment, while -3NO, dissolved inorganic nitrogen (DIN) and -23SiO were released from sediment to seawater in the Bohai Sea. Sediment-water nutrient exchange increases DIN and reduces the phosphorus load in the Bohai Sea. The release of silicate from sediment to overlying seawater reduces potential silicate limitation of primary production resulted from decrease of riverine discharge. The exchange flux of nutrients showed no obvious seasonal variation. The present study showed that the concentrations and composition of nutrients in the water column were affected by suspended sediment, and that not all the exchangeable phosphate in sediment could be released via sediment resuspension.