摘要:
Functionalized porous poly(aryl ether ketone) articles are prepared by reacting ketone groups in the backbone of poly(aryl ether ketone) polymer with a primary amine reagent. Preferred functional primary amines are primary aliphatic amines or substituted hydrazines containing one or more target functional groups including polar groups, such as hydroxyl groups, ˜OH, amino groups, ˜NH2, ˜NHR, ˜NRR′, and ethylene oxide groups, ˜OCH2CH2—, negatively or positively charged ionic groups, such as ˜SO3−, ˜COO−, and ˜NH4+ groups, hydrophobic groups such as siloxane or perfluorcarbone groups, and non-polar groups, such as linear or branched hydrocarbon groups. The functionalized porous poly(aryl ether ketone) article can be prepared by reacting primary amine with a pre-formed, shaped porous poly(aryl ether ketone) article or by functionalizing the surface of a non-porous precursor article that is subsequently converted into a porous article.
摘要:
An austenitic steel alloy includes manganese in an amount of from 25 wt % to 31 wt %, aluminum in an amount of from 7 wt % to 10 wt %, carbon in an amount of from 1.2 wt % to 1.6 wt %, molybdenum in an amount of more than 0 wt % and less than 6 wt %, and a balance of iron.
摘要:
A method for desorption of one or more gases from a liquid stream in which a liquid stream containing at least one gas is provided to the feed side of a porous membrane and a trans-membrane pressure drop from the feed side to the opposite gas side of the membrane is created, resulting in a portion of the liquid stream filling at least a portion of the pores of the porous membrane and desorption of at least a portion of the at least one gas from the liquid stream to the gas side of the porous membrane.
摘要:
Functionalized porous poly(aryl ether ketone) articles are prepared by reacting ketone groups in the backbone of poly(aryl ether ketone) polymer with a primary amine reagent. Preferred functional primary amines are primary aliphatic amines or substituted hydrazines containing one or more target functional groups including polar groups, such as hydroxyl groups, ˜OH, amino groups, ˜NH2, ˜NHR, ˜NRR′, and ethylene oxide groups, ˜OCH2CH2—, negatively or positively charged ionic groups, such as ˜SO3−, ˜COO−, and ˜NH4+ groups, hydrophobic groups such as siloxane or perfluorcarbone groups, and non-polar groups, such as linear or branched hydrocarbon groups. The functionalized porous poly(aryl ether ketone) article can be prepared by reacting primary amine with a pre-formed, shaped porous poly(aryl ether ketone) article or by functionalizing the surface of a non-porous precursor article that is subsequently converted into a porous article.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要翻译: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。
摘要:
Functionalized porous poly(aryl ether ketone) articles are prepared by reacting ketone groups in the backbone of poly(aryl ether ketone) polymer with a primary amine reagent. Preferred functional primary amines are primary aliphatic amines or substituted hydrazines containing one or more target functional groups including polar groups, such as hydroxyl groups, ˜OH, amino groups, ˜NH2, ˜NHR, ˜NRR′, and ethylene oxide groups, ˜OCH2CH2—, negatively or positively charged ionic groups, such as ˜SO3−, ˜COO−, and ˜NH4+ groups, hydrophobic groups such as siloxane or perfluorcarbone groups, and non-polar groups, such as linear or branched hydrocarbon groups. The functionalized porous poly(aryl ether ketone) article can be prepared by reacting primary amine with a pre-formed, shaped porous poly(aryl ether ketone) article or by functionalizing the surface of a non-porous precursor article that is subsequently converted into a porous article.
摘要:
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.