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346 results about "Stable storage" patented technology

Stable storage is a classification of computer data storage technology that guarantees atomicity for any given write operation and allows software to be written that is robust against some hardware and power failures. To be considered atomic, upon reading back a just written-to portion of the disk, the storage subsystem must return either the write data or the data that was on that portion of the disk before the write operations.

Electronic mail system with methodology providing distributed message store

An electronic mail system with a methodology providing distributed message storage and processing is described. In particular, this methodology breaks up how the individual components of message data are stored. Message data itself is broken up into two parts: a metadata (mutable) portion, and an immutable portion. The metadata portion represents that part of the message data that may change over time. This includes message status flags (e.g., the IMAP “message deleted” flag) and the message's position within a particular message folder, among other information. The immutable portion, which comprises the bulk of electronic mail data (namely, the message itself), once stored is never edited. Immutable data is written f+1 times on as many unique servers, to tolerate f number of server failures using Lampson's stable storage algorithm. The metadata portion is stored 2f+1 times on as many unique servers to tolerate f number of server failures using quorum voting. Once the message has been stored once, instead of being copied, its location is passed around by reference. The system utilizes a two-tier architecture. One tier consists of servers which store message metadata and immutable data, the Data Servers, and servers that operating upon those data, the Access Servers. Message store integrity is maintained in the event of server failure and as the set of Data Servers changes. In the latter case, I/O and storage workloads are dynamically redistributed across Data Servers in an efficient way.
Owner:PROOFPOINT INC

Hydroxy acrylic resin aqueous dispersion and water-based coating prepared therefrom

The invention discloses a method for preparing a hydroxy acrylic resin aqueous dispersion and the hydroxy acrylic resin aqueous dispersion prepared by the same and water-based coating using the hydroxy acrylic resin aqueous dispersion as a film forming matter. The hydroxy acrylic resin aqueous dispersion is prepared by a step free radical solution polymerization process and obtains a nucleus-shell structure by using an initiator of a specific type and a chain transfer agent and by a high-temperature polymerization reaction. The nucleus has weak hydrophilicity and no carboxyl, and the shell has a strong hydrophilicity and is rich in carboxyl, so stable storage can be realized. The obtained hydroxy acrylic resin aqueous dispersion has the characteristics of low solution content, high solid content and low viscosity. The coating prepared from the hydroxy acrylic resin aqueous dispersion and a water-based amino resin or a water-based polyurethane cross-linking agent has the characteristics of high brightness, good water resistance and excellent weather resistance. The hydroxy acrylic resin aqueous dispersion can be used for preparing an excellent base material of high-performance environment-friendly industrial protective coatings and widely applied to topcoats and primer-topcoat coatings in various fields.
Owner:LANGFANG JINHUILI INDAL PAINT

Preparation method of graphene dispersion liquid

The invention provides a preparation method of graphene dispersion liquid. The preparation method of graphene dispersion liquid comprises the following steps of: preparing dispersion liquid by using a dispersing agent; then adding the graphene into the dispersion liquid to obtain graphene liquid; and carrying out ultrasonic, refining and dispersing treatment on the graphene liquid to obtain the graphene dispersion liquid. The graphene suspension liquid prepared by the method is good in dispersion fissility and even in grain size and can exist stably; the performance of the graphene is not affected; the size distribution of the few-layer graphene ranges from 300 nanometers to 1 micro; the thickness is 2-10 layers; and the stable storage period is more than three months under the room-temperature condition. By adopting the preparation method, the technical problems that the dispersibility of graphene nanometer materials is poor in water and normal-temperature organic solvent, and the like are solved, the compatibility and the dispersibility of graphene in various composite materials are improved, the application fields of graphene are greatly improved, and the unitization, the standardization and the micromation of the graphene application can be realized well.
Owner:青岛科孚纳米技术有限公司

Preparation method of water-based crack paint for glass base material

The invention relates to a preparation method of a water-based crack paint for a glass base material. The water-based crack paint is composed of a water-based priming paint and a water-based crack finishing paint; the water-based priming paint is composed of acrylic resin, amino resin, a colorant, a dispersing agent, an adhesion promoter, a film-forming auxiliary agent, an acid catalyst, a functional auxiliary agent and other auxiliary agents; the water-based crack finishing paint is composed of acrylic resin, polyurethane resin, amino resin, a colorant, an acid catalyst, a dispersing agent, a film-forming auxiliary agent, a functional auxiliary agent and other auxiliary agents; the prepared water-based crack paint has low VOC, has no pollution to the environment, is nonhazardous to operators, and has the advantages of excellent coating film performance, strong adhesive force, good flexibility, high hardness, good scratch resistance, excellent water resistance, excellent alcohol resistance, simple construction, and stable storage. A coating film crack is a crystallization product integrated with classical art and a modern decoration style, has a unique three-dimensional aesthetic feeling, is elegant in style, and is quite popular with markets and quite loved by customers. The water-based crack paint is widely used for surface protection and decoration of glass products, woodware, metals, plastics and other products.
Owner:深圳市莱莉雅环保科技有限公司

Method for preparing viscosity-reducing polycarboxylate superplasticizer

The invention provides a method for preparing viscosity-reducing polycarboxylate superplasticizer. The viscosity-reducing polycarboxylate superplasticizer is prepared through a bulk polymerization reaction, and the method comprises the following steps of: (1) mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, controlling the temperature at 40-60 DEG C, stirring the mixture evenly, and then adding an initiator and a mixture of unsaturated carboxylic acids, hydroxyalkyl unsaturated carboxylate and a chain transfer agent; and (2) performing aging for 1-1.5 hours after the step (1) is completed, and reducing the temperature to obtain the viscosity-reducing polycarboxylate superplasticizer. Since the bulk polymerization reaction is carried out at a low temperature, the method has strong operability, mild conditions and low energy consumption; the viscosity-reducing polycarboxylate superplasticizer prepared by using the method is at a liquid state at room temperature, has effective concentration of 100% and stable storage performance, and is suitable for long-distance transportation and use; meanwhile, the viscosity of a concrete mixture can be reduced effectively through the superplasticizer so that stirring, transportation and pumping of concrete can be facilitated, and the superplasticizer is suitable for the promotion and application of high-rise engineeringand high-performance concrete.
Owner:JIAHUA CHEM MAOMING

Zymolysis rice milk beverage and preparation method thereof

The invention discloses a fermentation rice milk drink and a preparation method thereof, which adopts fermentation rice as raw material that is processed through immersion, water bathing, cooking, fermentation, beating and pulp refining, and then the pH value of the obtained emulsion is adjusted; thermostable alpha-amylase Unikamyl HT is added according to a portion of 10 kilograms of the material being added with 3 to 5ml of thermostable alpha-amylase Unikamyl HT; then the obtained starch milk is sent into the ejector device through a flow meter; through flash cooking, the temperature of the obtained material should rise to 95 to 98 DEG C; then thermal insulation, enzyme stabilization, cooling and pH value regulation are done; efficient glucoamylase Unikase GA is added according to the portion of 10 kilograms of the material being added with 5 to 15ml of efficient glucoamylase Unikase GA; the temperature of the obtained material should rise to 100 DEG C, and the killing of enzyme is done; next, the obtained material are added with water, citric acid, xanthan and sodium carboxymethyl cellulose; the temperature raises by 55 to 60 DEG C so as to do secondary homogeneous; finally, the super-high-temperature sterilization and aseptic packing are done. The fermentation rice has specific flavor of rice wine, and is characterized by sweet and fragrant taste, light yellow or ivory color, being rich in nutrition and with the functions of health care and skin-maintaining and stable storage.
Owner:SOUTH CHINA UNIV OF TECH
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