37 results about "Billionth" patented technology

A water trap system based on a thermoelectric cooling device is employed to remove a major fraction of the water from air samples, prior to analysis of these samples for chemical composition, by a variety of analytical techniques where water vapor interferes with the measurement process. These analytical techniques include infrared spectroscopy, mass spectrometry, ion mobility spectrometry and gas chromatography. The thermoelectric system for trapping water present in air samples can substantially improve detection sensitivity in these analytical techniques when it is necessary to measure trace analytes with concentrations in the ppm (parts per million) or ppb (parts per billion) partial pressure range. The thermoelectric trap design is compact and amenable to use in a portable gas monitoring instrumentation.

Methods and devices for repelling insects are disclosed. The methods and devices provide personal protection from insect bites and insect landings, particularly mosquito bites. The methods and devices employ insect repellents such as pyrethroids at low (parts per billion) levels. The methods and devices effectively minimize the number of mosquitoes landing on a subject properly using the devices.

Disclosed is a method for preventing osmotic membrane fouling comprising treating reverse osmotic feed water and membranes with chlorine dioxide at an extremely low concentration, e.g., as low as one part per billion in the feed water. The effective range may be in the range of 1-900 parts per billion. Also disclosed is a membrane separation system in which fouling is prevented using ultraviolet, pH acid adjustment or an electrochemical generator to produce the chlorine dioxide.

A hybrid external cavity laser (HECL) system comprises a diode laser, collection and collimation optics, and a volume Bragg grating, emits radiation at a single wavelength with a short-term wavelength stability in the order of at least one part in a billion The wavelength stability is achieved by use of a thermal management system, comprising inner and outer housings, each containing a temperature sensor, and electronic circuitry that monitors the temperatures and controls both the laser diode current and a thermoelectric cooler based on temperatures determined from said temperature sensors. The laser system is packaged in a compact enclosure that minimizes waste heat, facilitating use in applications that have heretofore employed stable, single-frequency lasers, including He—Ne lasers.

A method for forming fibers/composite material having an anisotropic structure, comprising the steps of mixing an effective amount of fibers with a matrix material to form a deformable mixture containing less than about 96 weight percent of the fibers to about parts per billion of the fibers and wherein the fibers are randomly oriented in the deformable mixture. The deformable mixture can be extruded, stretched or otherwise deformed to form an extrudate. Pressure is applied about the extrudate to substantially compress the fibers in the extrudate to provide the fibers/composite material having an anisotropic structure.

A method for estimating a helium content of the stainless steel core shroud in a boiling water nuclear reactor includes, in an exemplary embodiment, determining a neutron fluence for predetermined areas of the reactor, and estimating a helium content of the stainless steel shroud at predetermined areas of the reactor using the following equation: C_He=1031*(1−e^{−b<sub2>j</sub2>*φ<sub2>j</sub2>}), where C_He is the helium concentration as atomic parts per billion of helium in the stainless steel shroud per weight parts per million of boron in the stainless steel shroud, b_j is a value between about 2.50 e⁻²¹ and about 5.00 e⁻²¹, φ_j is fluence expressed as neutrons per square centimeter, and subscript j denotes thermal fluence or fast fluence.

The invention relates to a high-speed double-station-rechecking-type weighing quantifying filling machine which comprises a machine frame, a transmission system, a rotation disc and a weighing filling station. A weighing sensor is arranged under the bottle position of the rotation disc to weigh the filling volume, and a weighing rechecking station is arranged behind the rotation disc. The weighing rechecking station comprises a rechecking rotation disc and weighing rechecking sensors arranged under the bottle position of the rechecking rotation disc, and a rejecting pushing device is arranged behind the weighing rechecking station. The filling machine has the advantages that filling quantity consistency is ensured due to the fact that a weighing sensor is arranged on a filling valve of the weighing filling station; the rechecking station is added behind the filling station, so that the filling volume of the front filling station can be rechecked, and products not meeting the filling volume can be effectively prevented from entering the next procedure. More importantly, the plurality of rechecking sensors installed at the weighing rechecking station work simultaneously to achieve the aim of high speed rechecking. By means of the filling machine, the probability that unqualified products flow into the next procedure is reduced from one fifty thousandth to one in hundreds of millions and one in billions.

The aim of the present invention is to provide a health silk stockings produced using nanometer silver antibiotic material. The solution of the present invention is that to obtain nanometer stage silver particle (1 nanometer is equal to billionth meter) combining electrical arc method and mechnical rubbing method, then to implement antioxidation and anticoagulation treatment to the particles, at last to prepare nanometer silver antibiotic solution. To dip in the silk stockings in the nanometer silver antibiotic solution which temperature is 80 to 95 DEG C for 24 to 48 hours, then to take out and airing as well as iron out, so that the health silk stockings of the present invention is made. The silk stockings of the present invention has strong antibiotic effect, moreover, it is ventilating and flexible which ensure feet to be dry, the antibiotic effect is durable, also it has the deodorization effect, as well as release anion and far infrared energy, so it is a health silk stockings with complete function.

The invention aims to provide health-care silk stockings processed by utilizing a nanometer silver antibacterial material. In the technical scheme, a method for manufacturing the health-care silk stockings comprises the following steps of: obtaining nanometer silver granules of between 20 and 60 nanometers (1 nanometer is equal to one billionth meter) by combining an electric arc method and a mechanical lapping method, and performing the treatment of antioxidation and agglutinating resistance to prepare nanometer silver antibacterial solution finally; and immersing stockings weaved according to the requirement in the nanometer silver antibacterial solution at the temperature of 80 and 95 DEG C for 24 to 48 hours, taking the stockings out, airing, and ironing to obtain the health-care silk stockings. The nanometer silver antibacterial deodorizing health stockings manufactured by the method have ultrastrong sterilizing and antibacterial effects, are ventilated and soft in wearing, can often keep feet dry and comfortable, have a lasting antibacterial effect, are resistant to wash, can eliminate odor effectively and release negative ions and far infrared energy stably, and are health-care products which have complete and perfect functions.

A method for low-cost arsenic removal from drinking water using chemically prepared bottom ash pre-treated with ferrous sulfate and then sodium hydroxide. Deposits on the surface of particles of bottom ash form of activated iron adsorbent with a high affinity for arsenic. In laboratory tests, a miniscule 5 grams of pre-treated bottom ash was sufficient to remove the arsenic from 2 liters of 2400 ppb (parts per billion) arsenic-laden water to a level below 50 ppb (the present United States Environmental Protection Agency limit). By increasing the amount of pre-treated bottom ash, even lower levels of post-treatment arsenic are expected. It is further expected that this invention supplies a very low-cost solution to arsenic poisoning for large population segments.

An apparatus, system, and method are disclosed for low cost high resolution chemical detection. The apparatus includes two outer sealing bodies with flow channels etched into the bodies. Two gas chromatography (GC) columns are between the outer bodies, with a valve that switches flow regimes from series flow through the two GC columns to sample flowing directly to each GC column. The flow regimes are achieved with a single pump or dual pumps, and with one to three flow restrictions. The apparatus includes a preconcentration tube for concentrating chemicals of interest from the sample, and a sample switching valve and sampling pump to switch the sample flow from concentrating sample to delivering concentrated sample. The apparatus includes an engineered leak to equalize flow between a sample channel and a detector circuit. The sample channels may have impermeable inserts allowing the apparatus to measure chemicals in the parts-per-billion range.

The presence of mycotoxins in agricultural products necessitates large scale testing of a wide range of sample material to ensure the safety of food and feed. The mycotoxin ochratoxin A represents an enablement for all mycotoxins as the level of sensitivity necessary for regulatory requirements for this compound at the part per billion level are as low or lower than any other mycotoxin. This invention describes the identification of a set of DNA ligands with sufficiently high binding affinity and specificity for ochratoxin A to enable an improvement over existing methods for the separation, concentration and quantitative determination of ochratoxin A in sample material.

The present invention provides a printable nanosensor and leads that can be manufactured using three-dimensional printing techniques and printing directly on a daughter board that can be connected to a self-contained pre-amplified printed circuit board. Although graphene is highly sensitive as a chemical sensor and can detect parts per million (ppm) concentrations of species, the integration of printed graphene and other two-dimensional sensing materials to form a sensor assembly can be used to increase the sensitivity even further, enabling detection of parts per billion (ppb) concentrations and even single molecule detection.

The invention belongs to the technical field of electrochemistry, and in particular relates to a method for improving conductivity of a pure lithium iron phosphate anode material. According to the method, on the basis that the pure lithium iron phosphate anode material generally without conductivity is synthesized by using an ordinary method, a material with carbon-carbon and carbon-oxygen unsaturated bands is gasified by using a preset inert gas in a calcinator, subsequently the calcinator is cleaned at room temperature, and furthermore pure lithium iron phosphate is put into the calcinator to be subjected to inert gas calcination, so that the conductivity of the material is greatly improved. The conductivity of the material is increased to 1/10 siemens per centimeter from 1 ppb siemens per centimeter, or in other words, the resistance is reduced to be 10 Ohm from 1 billion Ohm. The residual carbon content of the lithium iron phosphate anode material treated by using the method is 0.3%, and the residual carbon content before the treatment is 0.2%. The method is used for preparing lithium ion batteries, a high capacity ratio can be obtained without adding conductive carbon, and the characteristics of excellent security property, long circulation period and the like can be achieved.

A method for effecting a comprehensive removal of heavy metals from wastewater in a two stage process in which the wastewater is contacted in a first stage with a source of ferric ions under mildly acidic conditions (pH 5 to pH 8), preferably followed by the removal of the precipitated solids using a solid-liquid separation; a second stage follows in which the wastewater from the first step is contacted with a source of ferric ions under alkaline conditions (pH 8+) followed by the removal of the precipitated solids using a second solid-liquid separation. Used in conjunction with an initial oxidation step, the present method makes possible the removal of a whole suite of heavy metals present in both the anionic and cationic form in refinery wastewater. The treatment also removes metal compounds in the particulate phase. Metals concentrations can be significantly decreased from the mid to high ppb (parts per billion) range down to the low ppb range to meet the quality criteria for discharge.

The invention discloses a high-purity ammonia production device. The device is prepared by connecting the following components in sequence through pipelines: an ammonia raw material tank, a potassium-sodium alloy tank, a diaphragm compression pump, a condenser, a gas-liquid separation tank, and an ammonia finished product tank. An active carbon filter is arranged in the gas-liquid separation tank, the condenser and the gas-liquid separation tank are put in a refrigerating box, and the potassium-sodium alloy tank is the core component of the high-purity ammonia production device and is full of potassium-sodium alloy, which is prepared by melting high purity potassium and sodium together according to a certain ratio. The provided production device can be co-used with a distillation tower, a rectifying tower, and the like. When ammonia gas goes through the potassium-sodium alloy tank, gas containing the oxygen element such as oxygen gas, water, carbon dioxide, carbon monoxide, and the like is absorbed by the potassium-sodium alloy, the content of oxygen in the forms of oxygen gas, water, carbon dioxide, carbon monoxide, and the like is reduced to the ppb (part per billion) level, and the provided production device is suitable for producing high-purity ammonia gas.

A device for detecting impurities in a noble gas includes a detection chamber and a source of pulsed ultraviolet light. The pulse of the ultraviolet light is transferred into the detection chamber and onto a photocathode, thereby emitting a cloud of free electrons into the noble gas within the detection chamber. The cloud of electrons is attracted to the opposite end of the detection chamber by a high positive voltage potential at that end and focused onto a sensing anode. If there are impurities in the noble gas, some or all of the electrons within the cloud will bond with the impurity molecules and not reach the sensing anode. Therefore, measuring a lower signal at the sensing anode indicates a higher level of impurities while sensing a higher signal indicates fewer impurities. Impurities in the range of one part per billion can be measured by this device.

Spectroscopic apparatus and methods incorporating a gas sensor configured to detect low concentration gases, including gases that are hazardous volatiles are provided. Low concentration gases can comprise gases where detection of concentrations on the order of parts-per-million (ppm), and in many embodiments part-per-billion (ppb) is required. The gas may be a species, such as, for example hydrogen sulfide (H₂S) that may be produced in drilling and/or volcanic eruptions. The spectroscopic apparatus and methods are configured to operate in particular atmospheres where gas detection can be challenging, such as in ambient air and/or in space where various contaminants may be present. The spectroscopic apparatus and methods may incorporate a long path length detector, such as, for example, a cavity-enhanced absorption spectrometer. The methods and apparatus further incorporate a wavelength modulation technique to improve the signal-to-noise ratio.

A radiation detector crystal is made from Cd_xZn_1-xTe, where 0≦x≦1; an element from column III or column VII of the periodic table, desirably in a concentration of about 1 to 10,000 atomic parts per billion; and the element Ruthenium (Ru), the element Osmium (Os) or the combination of Ru and Os, desirably in a concentration of about 1 to 10,000 atomic parts per billion using a conventional crystal growth method, such as, for example, the Bridgman method, the gradient freeze method, the electro-dynamic gradient freeze method, the so-call traveling heater method or by the vapor phase transport method. The crystal can be used as the radiation detecting element of a radiation detection device configured to detect and process, without limitation, X-ray and Gamma ray radiation events.