Abstract:
The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.
Abstract:
A tool for installation and removal of a connector of a gas-insulated switchgear termination includes a housing defining an operation chamber therein, a mounting assembly selectively disposed in the operation chamber of the housing and adapted for securely installing a sleeve member of a gas-insulated switchgear termination on a conical connector member of the gas-insulated switchgear termination or removing the sleeve member securely sleeved on the conical connector member from the conical connector member, an actuator assembly adapted for actuating motion of the mounting assembly, and a friction reducing assembly adapted for reducing friction and resistance occurring during the motion of the mounting assembly.
Abstract:
Composite porous hydrophobic membranes are prepared by forming a perfluorohydrocarbon layer on the surface of a preformed porous polymeric substrate. The substrate can be formed from poly (aryl ether ketone) and a perfluorohydrocarbon layer can be chemically grafted to the surface of the substrate. The membranes can be utilized for a broad range of fluid separations, such as microfiltration, nanofiltration, ultrafiltration as membrane contactors for membrane distillation and for degassing and dewatering of fluids. The membranes can further contain a dense ultra-thin perfluorohydrocarbon layer superimposed on the porous poly (aryl ether ketone) substrate and can be utilized as membrane contactors or as gas separation. membranes for natural gas treatment and gas dehydration.
Abstract:
The present invention discloses a digital signature scheme based on braid group conjugacy problem and a verifying method thereof, wherein the signatory S selects three braids xεLBm(l), x′εBn(l), aεBn(l), and considers braid pair (x′,x) as a public key of S, braid a as a private key of S; Signatory S uses hash function h for a message M needing signature to get y=h(M)εBn(l); generating a braid bεRBn−1−m(l) randomly, then signing the message M with the own private key a and the braid b generated randomly to obtain Sign(M)=a−1byb−1a; a signature verifying party V obtains the public key of S, calculating the message M by employing a system parameter hash function h, obtaining the y=h(M); judging whether sign(M) and y are conjugate or not, if not, sign(M) is an illegal signature, the verification fails; if yes, sign(M) is a legal signature of message M; the present invention avoids the problem of k-CSP in SCSS signature scheme of prior art, and improves the security of signature algorithm and reduces the number of braids involved and the number for conjugacy decision without reducing security, thereby improving the operation efficiency of signature.
Abstract translation:本发明公开了一种基于编织群共轭问题的数字签名方案及其验证方法,其中签名者S选择三个辫子bra B m SUB SUB SUB SUB SUB SUB SUB SUB SUB SUB (l),aepsilonB(1),并将辫子对(x',x)视为S的公钥,辫子a作为S的私钥; 签名者S使用哈希函数h来获得需要签名的消息M,以获得y = h(M)epsilonB(1); 随机生成辫子bepsilonRB n-1-m(l),然后用自己的私钥a签署消息M,随机生成辫子b以获得Sign(M)= a& 1 SUP> BYB SUP> -1; 签名验证方V获得S的公开密钥,通过采用系统参数散列函数h来计算消息M,获得y = h(M); 判断符号(M)和y是否是共轭的,如果不是,则(M)是非法签名,验证失败; 如果是,则(M)是消息M的合法签名; 本发明避免了现有技术的SCSS签名方案中的k-CSP问题,提高了签名算法的安全性,减少了涉及的辫子数量和共轭决定的数量,而不降低安全性,从而提高了签名的操作效率。
Abstract:
A process for preparing polyimide gas separation membranes is disclosed. The process involves preparing polyamic acid salt membrane precursors that are converted into polyimide membranes by mild thermal or chemical treatments. The gas separation processes that utilize these polyimide membranes are further disclosed.
Abstract:
Disclosed are a monitoring method and system and an integrated monitoring device for an antenna oscillator of a base station, which are used to monitor whether an anomaly occurs in the antenna oscillator of the base station. The monitoring method for an antenna oscillator of a base station in the present invention comprises: performing wave detection and analog-to-digital conversion on an obtained transmission signal of the antenna oscillator of the base station, to acquire a digital signal of a direct-current signal of the transmission signal; determining the amplitude of changes of the digital signal in a set time length, and when the amplitude of the changes is greater than a preset amplitude change threshold, determining that an anomaly occurs in the antenna oscillator; otherwise, determining that the antenna element is normal.
Abstract:
Composite porous hydrophobic membranes are prepared by forming a perfluorohydrocarbon layer on the surface of a preformed porous polymeric substrate. The substrate can be formed from poly(aryl ether ketone) and a perfluorohydrocarbon layer can be chemically grafted to the surface of the substrate. The membranes can be utilized for a broad range of fluid separations, such as microfiltration, nanofiltration, ultrafiltration as membrane contactors for membrane distillation and for degassing and dewatering of fluids. The membranes can further contain a dense ultra-thin perfluorohydrocarbon layer superimposed on the porous poly(aryl ether ketone) substrate and can be utilized as membrane contactors or as gas separation. membranes for natural gas treatment and gas dehydration.
Abstract:
The present invention discloses a digital signature scheme based on braid group conjugacy problem and a verifying method thereof, wherein a signatory S selects three braids xεLBm(l), x′εBn(l), aεBn(l), and considers braid pair (x′,x) as a public key of S, braid a as a private key of S; Signatory S uses hash function h for a message M needing signature to get y=h(M)εBn(l); generating a braid bεRBn−1−m(l) randomly, then signing M with a and b to obtain Sign(M)=a−1byb−1a; a signature verifying party V obtains the public key of S, calculating the message M by employing hash function h, obtaining the y=h(M); judging whether sign(M) and y, sign(M)x′ and xy are conjugate or not, if yes, sign(M) is a legal signature of message M; the present invention reduces the number of braids involved and the number for conjugacy decision without reducing security, thereby improving the operation efficiency of signature.
Abstract:
A method/system for avoiding software conflicts, with library being divided into layer 1 to layer M and M≧1. The method including the following steps: before a program runs, prescanning calling functions of the binary executable code of the program and called functions that belong to libraries of layer 1 and are individually called by the calling functions of the binary executable code of the program, and if M>1, further prescanning calling functions that belong to libraries of layer 1 to layer M−1 and called functions that belong to libraries of layer 2 to layer M and are individually called by the calling functions that belong to libraries of layer 1 to layer M−1, so as to determine whether there exists any individual conflict between the calling functions and the corresponding called functions; if there exists at least one conflict, storing at least one piece of conflict information individually indicating the at least one conflict; and when the program calls a library directly called by the program, abandoning loading of the library if conflict information correspond to the library has been stored, or loading the library otherwise.
Abstract:
An apparatus for monitoring an input optical signal at a plurality of distinct optical frequencies is disclosed wherein a demultiplexing arrayed waveguide grating (AWG) having a plurality of M>1 Vernier input ports is disposed between an optical switch and a photodiode array coupled to the output ports of the AWG. In operation, the optical switch sequentially provides the input optical signal into each of the Vernier ports, and signals detected by photodiodes are stored in a memory unit. The apparatus is capable of monitoring the input optical signal with a frequency step which is M times smaller than a frequency spacing between the AWG transmission bands, and obtain M frequency-resolved readings from each photodiode.