71results about How to "No security" patented technology

The invention relates to the field of commutation and discloses an authentication and key negotiation method, an authentication method, a system and a device, which leads a user card to be capable of resisting the playback attack during the process of an AKA under the situation of not supporting SQN storing. In the invention, when a network side receives the authentication request of a terminal, a random number, a first sequence number SQN1 and a first authentication code MAC are sent to the terminal according to the shared key, the random number and the first authentication code MAC generated by the first sequence number SQN1, the first authentication code MAC represents the current system time at the network side; if a second authentication code XMAC is the same as the first authentication code MAC, and the difference value of a second sequence number SQN2 representing the current system time at the terminal side and the first sequence number SQN1 meet a preset condition, the terminal determines the network side legal according to the key shared with the network side, the received random number and the first authentication code MAC generated by the first sequence number SQN1.

The invention belongs to the technical field of environmental protection and discloses a treatment method for paint spraying waste gas. The method is characterized in that paint spraying waste gas is treated through a circulating concentration manner, namely after large-flow and low-concentration gas discharged from a spraying chamber is treated by paint mist, most of the gas is circulated to the spraying chamber, and a small amount of the gas is discharged after being purified; and as paint spraying is performed, the concentration of gas in the spraying chamber increases gradually, and then large-flow gas is concentrated into small-flow gas to be purified, so that the purification efficiency, the stability and the security of waste gas can be improved advantageously, and the investment and running cost of treatment equipment can be reduced at the same time. The method has the advantages that the discharge flow rate of waste gas can be reduced, and paint spraying waste gas can be treated effectively to meet the national requirements of discharge of 'three wastes'.

The invention relates to a fragrant microcapsule type finishing agent which comprises the following constituents by mass percentage: 35-45 percent of fragrant nano microcapsule, 35-45 percent of thickening agent, 15-25 percent of adhesive and 1-5 percent of color paste, wherein the sum of the percentages of all the constituents is 100 percent. The invention also discloses a nano microcapsule type dry garment piece which has lasting fragrance more than 1 year, is sterile, has high safety, has no stimulation to the skin and no allergic response, and is suitable for fragrance finishing and storing of fabrics and ready-to-wear clothing made of cotton, wool, silk, linen and chemical fiber; and the fragrant nano microcapsule has good particle dispersivity on base cloth and is extremely easy to embed into the base cloth tissue structure.

The invention relates to a hydraulic grabbing mechanical arm for an anti-collapsing rock-soil retaining wall. The hydraulic grabbing mechanical arm comprises a damping supporting mechanism, wherein the damping supporting mechanism comprises a fixed platform; three parallel-connection branch chains are evenly mounted on the upper end face of the fixed platform in the direction of the axis, and the top ends of the three parallel-connection branch chains are mounted on the lower end face of a movable platform; each parallel-connection branch chain comprises a concave support welded to the upper end face of the fixed platform, a lower limiting shaft is mounted between middles of two sides of each concave support, and two arc limiting grooves are symmetrically formed in the inner wall of the upper end of each concave support; each lower limiting shaft is sleeved with a first hydraulic cylinder, two limiting rods are arranged on the two sides of the bottom end of each first hydraulic cylinder, and the tail ends of two limiting rods are connected with corresponding two arc limiting grooves in a sliding fit manner; and a hydraulic grabbing device is mounted at the upper end face of the movable platform. According to the mechanical arm, the stable automatic hydraulic grabbing function of masonry can be achieved, the phenomenon of vertical shaking or left-and-right shaking in the carrying process can be avoided, and stability performance is good.

The invention discloses a positioning and tracking system of an underground / roadway moving object, comprising underground positioning and tracking systems distributed under a detected mine and ground monitoring systems distributed on the ground; two-way communication is conducted between the underground positioning and tracking system and the ground monitoring system; the underground positioning and tracking system comprises a plurality of wireless radio-frequency labels, a plurality of wireless signal receiving and transmitting devices and a plurality of card readers which are respectively carried by underground workers, are internally stored with the information of the identity and engaged job category information of a cardholder, can read the stored information in the wireless radio-frequency labels within respective signal coverage area in real time, and synchronously upload the read information and the internally-stored information to the card reader of the receiving and transmitting device; and the wireless radio-frequency labels are distributed on a coal mining work surface or a coal mining roadway. The positioning and tracking system has reasonable design, convenient installation and distribution, low cost, complete function and good use effect, and also improves the coverage area correspondingly while saving the cost.

The invention discloses a method for determination of the polychlorotrifluoroethylene (PCTFE) content in a polymer-bonded explosive (PBX) by near infrared spectroscopy. The method includes the steps of: preparing and collecting 260 PBX samples, taking 180 samples of them as a calibration set for establishing a calibration model, taking the remaining 80 samples as a validation set for model validation, and acquiring the near infrared spectrum data of all the samples; using a standard method to determine the PCTFE content in the samples; subjecting the spectrum data of the validation set samples in the wave bands of 6102.0cm<-1>-5697.0cm<-1> and 4680.2cm<-1>-4242.9cm<-1> to a first order derivative treatment, correlating the treated spectrum data with the PCTFE content by a partial least squares method, and establishing the calibration model by cross validation; employing the calibration model to predetermine the PCTFE content of the validation set samples, and selecting an optimal model according to a minimum root mean squared error of prediction (RMSEP) of the validation set; and acquiring the near infrared spectrum data of the samples to be determined, and making use of the optimal model to obtain the PCTFE content directly. Being suitable for determination of the PCTFE content in a PBX explosive, the method has the characteristics of convenient operation, and rapid and accurate analysis.

The invention provides a specific tag based on computer vision perception and recognition. The specific tag comprises keywords or searches used for query and search in a search engine and a general query searching system. The specific tag adopts two-dimensional codes, bar codes, numbers with specific formats, letters with specific formats, texts with specific formats, special figures, special movements and other image formats which are displayed through self-luminous objects and reflected light objects, and can be used for storing, delivering and publishing key words, searching and so on. Information can be expressed in binary code, Morse code, American standard code for information interchange(ASCII) and so on, and can be encrypted and compressed. The specific tag based on computer vision perception and recognition can be extended to a specific tag based on computer auditory, feeling, taste and olfactory perception and recognition. The invention provides an application system supporting an usage method of the specific tag, and query and searching service can be requested by a non-contact input through perception and recognition, so that the usage method is convenient and safe and has no physical abrasion. The invention also provides a keyword-dedicated specific tag in extended form with unique usage method, which can create a new business model for search business.

The invention belongs to the field of enzymology and medicinal preparations, and relates to an ophthalmic preparation containing lysozyme. Specifically, the content of the lysozyme in the ophthalmic preparation is 0.001%-25% (w / w), 0.01%-20% (w / w), 0.1%-15% (w / w), 0.3%-10% (w / w) or 0.5%-5% (w / w). The ophthalmic preparation and the lysozyme therein have good stability and good performances of bacteriostasis and / or antisepsis and are helpful for long-term storage.

The invention discloses a natural enteric soft capsule which comprises a soft capsule body and an enteric coating layer. The soft capsule body comprises content and a capsule shell; the content comprises the following raw materials as per parts by weight: 0.10 to 100.00 parts of active ingredient; the capsule shell comprises the following materials as per parts by weight: 20.00 to 30.00 parts of gelatin, 6.00 to 20.00 parts of capsule shell humectant, and 15.00 to 30.00 parts of water; and the enteric coating layer comprises the following materials as per parts by weight: 1.0 to 10.00 parts of film former, 1.0 to 10.00 parts of coating humectant, and 10.00 to 100.00 parts of water. The invention further discloses a preparation method of the natural enteric soft capsule. The natural enteric soft capsule has the benefits that firstly, main components of the natural enteric soft capsule pass the U.S. GRAS certification and can be safely applied to food and drug; secondly, coating material takes water as solvent, so that potential safety hazard, such as toxicity, inflammability, explosion hazard and the like, does not exist, and the production is safer; thirdly, a coating film of the enteric coating soft capsule has more tenacity and better adhesive force, and the stability is better during long-term storage; and the coating film is not cracked and falls off when being vibrated, impacted or squeezed.

The invention provides drying equipment which comprises an inert gas feeding device, a vibration fluidized drying device and a multichannel microwave drying device. The inert gas feeding device is connected with the vibration fluidized drying device and the multichannel microwave drying device through pipelines and used for inputting inert gases to the vibration fluidized drying device and the multichannel microwave drying device. A wet material feeding valve is for feeing wet materials is arranged on the vibration fluidized drying device, and the vibration fluidized drying device is further provided with a pre-drying material discharge valve for discharging the wet materials after the wet materials undergo fluidized drying. A discharge port portion of the pre-drying material discharge valve is connected with a material discharge channel for conveying pre-drying materials to the multichannel microwave drying device which is connected with the material discharge channel. The multichannel microwave drying device is further provided with an end product drying material discharge valve for discharging the pre-drying materials after the pre-drying materials undergo microwave drying.

The invention discloses an electric automobile charging gun structure. The electric automobile charging gun structure comprises a fixed end and a movable end. The fixed end and the movable end respectively comprise a magnetizer and an induction coil and can be matched with each other. During charging, the movable end is inserted into the fixed end. Each induction coil is connected with a power converter of a corresponding charging circuit, wherein the power converter is connected with a charging controller, the charging controller is connected with a communication module, the charging controller is used for detecting the input / output voltage and the current of the power converter, receiving a data signal from the communication module, sending the processed data to the communication module and sending a control signal to the power converter. A charging gun is of an electric isolation structure, a metal electrical plugging piece does not exist, and therefore electric leakage, bad contact and other potential safety hazards cannot occur; the electric automobile charging gun structure has a good shielding effect, and electromagnetic radiation is effectively avoided.

The invention provides a cooking appliance capable of limiting cover opening, and a control method for the same. The cooking appliance comprises a pot body, a liner and a pot cover, the liner is placed in the pot body; the pot cover is hinged on the pot body in an openable manner; a rice washing device or a material unloading device used to store raw material is disposed on the pot cover; the cooking appliance also comprises a cover-opening-limiting device; opening of the pot cover is limited by the cover-opening-liming device when the rice washing device stays at a working stage or when the material unloading device stays at a stage when the raw materials are discharged to the liner; and the working stage of the rice washing device or the stage when the material unloading device discharges the raw materials to the liner exists before a cooking stage of the cooking appliance. In this way, even if a user triggers a cover opening operation by mistake, the pot cover is not opened due to existence of the cover-opening-limiting device; damage of electric control components or safety problems does / do not take place; and the user's experience is good.

A solar comprehensive heating system capable of supplying heat and hot water integrally for a house comprises a vacuum tube solar collector, a collector water inlet pipe, a collector water outlet pipe, a heat storage pipeline, a heat exchanger, a domestic hot water pipe and a hot water use terminal. The collector water inlet pipe and the collector water outlet pipe are communicated with the solar collector. The collector water outlet pipe is communicated with the heat storage pipeline and is part of the heat storage pipeline. The heat storage pipeline is communicated with the collector water inlet pipe through connecting water pipes provides with switch valves. The collector water inlet pipe and the heat storage pipeline are connected with a low temperature radiation heating manifold through heating pipes so as to form water circulation. Water circulation between the vacuum tube solar collector and municipal heating hot water pipes are formed by the aid of the collector water inlet pipe and the heat storage pipeline. The solar comprehensive heating system is simple in structure, low in manufacture and maintenance cost, and low in maintenance difficulty.

The invention discloses an intelligent interactive coded lock control system comprises a power supply management module, a microprocessor, a motor control module, a position sensing module, a communication module, a storage module and external unlocking equipment. The invention further provides an intelligent interactive coded safe case lock and an installing and using method thereof. An opening password of an electronic coded lock is randomly generated by a background computer based on relevant parameters according to a cryptographic algorithm, and is effective once in a limited manner without safety problems such as key and password loss, and periodic replacement, and thus the efficiency and the safety of the concentrated operation of self-service equipment are improved. The electronic coded lock is mainly applicable to management of a safe case, management of an ATM (Automatic Teller Machine), and concentrated operation management of the self-service equipment. The electronic coded lock is used for replacing a conventional mechanical coded block, the defects of small password amount and poor safety performance of the mechanical coded lock are overcome, the electronic coded block is greatly improved in technology and performance, the existing mechanical coded lock is only replaced during use, and other costs are not required.

The invention relates to a stone exploiting method. The stone exploiting method comprises the following steps: drilling a hole in a stone by using a drill bit, and putting an expansion head element into the drilled hole; connecting a working medium source with the expansion head element; applying pressure to a working medium by using a manual hydraulic pump; arranging an energy distributor between the manual hydraulic pump and a hydraulic pipe; expanding the capacity of an expansion rubber hose in the expansion head element by using the pressurized working medium and transmitting oriented acting force; applying the oriented acting force to the hole wall of the hole so as to crack the stone in the oriented direction to form a cracked surface; when cracks are formed in the stone, reducing the pressure of the working medium to zero; and recovering the expansion head element to be in an initial state. In the method, large-size machinery is not required and the stone can be exploited by using the manual hydraulic pump, so that operation steps are greatly simplified, the production efficiency is improved, the labor intensity is reduced and the use time is short. The stone exploiting method meets the environment-friendly requirements, has no noises and no dust, is safe, easy to operate and easy to maintain, and has low energy consumption so that energy sources are saved.

The invention relates to a preparation method of superparamagnetic Fe3O4 nano-particles, belonging to the field of inorganic nano material preparation. The method is characterized in that the method adopts nontoxic glycerin, arginine, water and ferric iron as raw materials to synthesize high-quality superparamagnetic nano Fe3O4. The method features reasonable design of technical proposal, simple operation, easy control of reaction, good repeatability, no pollution and good safety. The prepared Fe3O4 nano-particles have high saturated magnetic intensity and tiny coercivity, can be conveniently combined with antibodies, are excellent super-magnetic nano materials and can be widely applied to the field of biomedicines.

The invention discloses a verification device for a photoelectric current transformer and a method thereof. The verification device comprises a voltage source, a motion module and a signal acquisition module. The voltage source is used for generating the voltage signal of the signal which is output by the photoelectric current sensor of the photoelectric current transformer to be verified. The voltage signal is a voltage analog quantity. The voltage source is connected with the motion module, thereby forming a virtual measuring channel. The motion module converts the voltage analog quantity to an optical signal. The optical signal is used as a reference signal for verification and is transmitted to the photoelectric converter of the photoelectric current transformer to be verified through an optical fiber. The signal acquisition module is an electric power control system or an electric power protecting system which is connected with the photoelectric converter of the photoelectric current transformer to be verified. The verification device for the photoelectric current transformer and the method thereof have advantages of easy application, low cost and high calibration precision.

The invention discloses an extreme pressure anti-wear additive. The extreme pressure anti-wear additive is prepared from the following raw materials in parts by weight: 10-20 parts of sublimed salicylic acid, 80-100 parts of boric acid, 3-4 parts of lithium hydroxide, 4-6 parts of calcium hydroxide, 40-60 parts of potassium hydroxide, 70-90 parts of water, 120-160 parts of base oil A, and 60-80 parts of base oil B. The sublimed salicylic acid and the lithium hydroxide are adopted, the calcium hydroxide is added, it is ensured that borate can be well dispersed through a special production technology, in the application process, the adverse effects on lubricant performance are minimized, the water-resisting property and the extreme pressure anti-wear property of a product are greatly improved, and the problem that the borate is prone to sedimentation is also solved effectively. The prepared extreme pressure anti-wear additive has the extremely-high extreme pressure anti-wear property andheat stability, four-ball test PB is greater than or equal to 2000 N, PD is greater than or equal to 8000 N, and the good anti-wear extreme pressure property is still be achieved when the using temperature reaches to 250 DEG C or above.

The invention discloses a lithium iron phosphate positive plate. The lithium iron phosphate positive plate comprises an aluminum foil and water-based positive slurry which coats the aluminum foil; thewater-based positive slurry comprises lithium iron phosphate, carbon nanotubes, graphene, chitosan, butadiene styrene rubber, sodium carboxymethyl cellulose, sodium alginate and amino silicone oil; and the particle size of the lithium iron phosphate is 4-10 microns. According to the lithium iron phosphate positive plate of the invention, a positive electrode active substance with large particle size and small specific surface area is adopted, so that the low-temperature performance of the lithium iron phosphate positive plate is good; the environment-friendly water-based positive electrode slurry is adopted, so that the positive electrode plate is environment-friendly, non-toxic, good in processing environment adaptability and stable in processing performance, and the obtained positive electrode plate is high in compaction density, high in specific energy and excellent in low-temperature property. The invention further discloses an environment-friendly low-temperature-resistant lithium battery which comprises the lithium iron phosphate positive plate and is combined with a negative plate with high cost performance, large capacity and high activity, and the obtained lithium iron phosphate battery is good in safety performance, high in energy density, excellent in low-temperature performance, stable in processing performance, free of pollution in the production process and low in battery cost.

A driving structure for mounting a machine gun on an unmanned aerial vehicle comprises a safety driving mechanism and a trigger driving mechanism which are respectively used for controlling a safety and a trigger of the machine gun mounted below the unmanned aerial vehicle through a machine gun hanger. According to the safety driving device, the safety of the machine gun mounted on the unmanned aerial vehicle can be controlled by remotely controlling the stretching and retracting of a linear motor, so that the machine gun is locked or unlocked, the operation and control are simple, the strokeis positioned accurately, the action is quick, and the operation and control safety of the machine gun mounted on the unmanned aerial vehicle is improved. According to the trigger driving mechanism, by remotely controlling an electromagnet to be powered on and powered off, the trigger of the machine gun mounted on the unmanned aerial vehicle can be operated and controlled to fire or extinguish themachine gun, and the operation and control are simple. The present invention provides a prevention measure for avoiding jamming, the safety accidents difficult to fire or extinguish are avoided, andthe driving structure has the extremely high reliability and safety.

The invention belongs to the technical field of medical treatment and health and particularly relates to a concentrated adipose-derived stem cell culture supernatant preparation to treat skin scalding. The concentrated adipose-derived stem cell culture supernatant preparation is prepared with supernatant of a cell culture fluid cultured via adipose-derived mesenchymal stem cells; cell factors hrEGF, VEGF and bFGF are added to the preparation. The invention also provides a preparation method and application of the concentrated adipose-derived stem cell culture supernatant preparation. The concentrated adipose-derived stem cell culture supernatant preparation of the invention can significantly promote healing of scald wounds, and the results lie in the aspect: after the use of the preparation, epidermis and dermis can heal and restore their functionality faster than those treated in a positive control and other embodiment groups. In addition, the concentrated adipose-derived stem cell culture supernatant preparation of the invention is free of living cell ingredients, no ethic issues or immune safety issues occur, compounding the preparation when it is needed is not required, and thepreparation is convenient to apply.

The steam pre-treatment method for raising the microwave sterilizing effect of fruit and vegetable belongs to the field of dewatered fruit and vegetable sterilizing technology. The technological process includes the first steam heating on fruit and vegetable powder with water content of 2-7 wt% for 5-15 min to raise water content to 13-22 wt% and the subsequent microwave drying and sterilizing for 90-150 s. The fruit and vegetable powder through the said sterilizing process has ultimate water content of 2-7 wt%, 3-4 log order lowered bacteria amount and high sanitary quality. The steam pre-treatment can raise the dielectric constant of the fruit and vegetable powder so as to raise the microwave sterilizing effect greatly while providing certain sterilizing effect.

A photosensitive resin model loading device is provided. The device includes a basic unit, a tensile loading unit, a pressure loading unit and a calibrating unit. The basic unit includes a pedestal, a frame and a supporting bar. The frame includes a top cross beam and two vertical arms. The two vertical arms are vertically fixed to the pedestal. The top cross beam is fixedly and horizontally connected to the two vertical arms. The supporting bar is horizontally disposed between the two vertical arms. The tensile loading unit is disposed between the supporting bar and the pedestal in a detachable manner, and includes a connector, a tensile loading base, a tensile screw and a tensile force sensor. The pressure loading unit is disposed between the supporting bar and the top cross beam in a detachable manner, and includes a pressure loading base, a pressurizing screw, a pressurizing force sensor and a limiting plate. The calibrating unit is disposed on the basic unit and is used for measuring levelness and perpendicularity changes of the basic unit.

The invention provides a mobile terminal and a communication method thereof. The mobile terminal and the communication method are mainly characterized in that a display screen in the mobile terminal is taken as a signal emission source; the black and white of the screen correspond to '0' and '1' in a binary system respectively; a light sensor in the mobile terminal is taken as a signal receiving source: the black and white changes of the display screen of an opposite mobile terminal are detected, and the black and white are converted into '0' and '1' which can be identified internally; and a distance sensor of the mobile terminal is taken as a basis for judging whether or not the two mobile terminals are matched with each other, so that automatic data receiving / transmitting is ensured, and meanwhile wrong judgment due to various external flashing light rays is avoided. Through adoption of the mobile terminal and the communication method, a convenient and rapid point-to-point communication technology is realized practically and effectively.

The invention relates to a preparation method for production of a polyaluminium chloride water purification agent through aluminum ash, and belongs to the technical field of water purification agent preparation. The preparation method comprises the following preparation steps that (1) an aluminum ash pretreated material, nano magnesium carbonate, aluminium oxide and calcium carbonate are mixed; (2) a mixed material is calcinated; (3) the calcinated material is crushed; (4) the calcinated and crushed material, hydrochloric acid and water are compounded; and (5) the compounded material is cured.According to the preparation method for production of the polyaluminium chloride water purification agent through the aluminum ash, resource utilization of industrial hazardous waste aluminum ash iseffectively realized, a polyaluminium chloride product conforming to GB / T22627-2014 is obtained, as for the prepared polyaluminium chloride water purification agent, compared with a common water purification agent, the adsorbing performance of the prepared inorganic water purification agent is significantly improved, and meanwhile, the effect of efficiently removing phosphorus and arsenic in sewage is achieved.

The invention belongs to the technical field of regenerative medicine and discloses a method for preparing an adipose-derived ECM (extracellular matrix) through built-in ultrasonic waves, which comprises steps of centrifugation, ultrasonic crushing, centrifugal collection and the like. According to the preparation method, most mature adipose cells in adipose tissue are crushed through ultrasonic waves, manure adipose cells and SVF cells are removed, the ECM is prepared, and too low ECM content and cell factor loss caused by complex operation are avoided effectively. According to the method, the ECM rich in cell factors is prepared without addition of exogenous chemical substances, the prepared ECM contains no exogenous substances, and adipose autotransplantation and effectiveness of the ECM as a biological filling material can be improved. The adipose-derived ECM material prepared with the method can be applied to autotransplantation stem cell therapy, reduces complications caused by adipose transplantation, increases the survival rate of transplanted adipose and has broad application prospects.

The invention discloses a method for preparing calcium fluoride from phosphorous ore-associated fluorine resources, and belongs to the technical field of phosphorus chemical engineering. The method comprises the steps: performing a reaction on a fluorine-containing compound and potassium hydroxide, performing solid-liquid separation after completion of the reaction so as to obtain a silicon-containing potassium fluoride solution, adding a fluorosilicic acid to the silicon-containing potassium fluoride solution so as to adjust the pH value, performing filter separation so as to obtain a potassium fluoride solution and silica-potassium fluorosilicate solid, returning the silica-potassium fluorosilicate solid to the first step, performing a reaction on the potassium fluoride solution an calcium hydroxide, performing solid-liquid separation after completion of the reaction so as to obtain calcium fluoride and a potassium hydroxide filtrate, recycling a part of the potassium hydroxide filtrate to the first step, and concentrating the remaining potassium hydroxide solution so as to obtain a potassium hydroxide product. The shortcoming that fluorine-containing compounds in by-products ofa wet preparation process of phosphoric acid cannot be utilized other than fluorosilicic acid in the prior art is overcome, full utilization of the fluorine-containing compounds is achieved, and meanwhile the waste fluorine-containing compounds can be processed into high-value calcium fluoride, potassium hydroxide and silicon dioxide.

The invention provides an infrared drying method used for preparing chitosan biological gel membrane. The infrared drying method used for preparing chitosan biological gel membrane comprises followingsteps: chitosan and an acetic acid solution are introduced into a beaker, water bath heating and stirring are carried out, glycerin is added after complete dissolving is achieved, full mixing is carried out, uniform tape casting into a glass mould is carried out, ultrasonic vibration defoaming is carried out, and drying in an infrared ray drying oven is carried out; chitosan and genipin are takenas raw materials to prepare a mixed solution, ultrasonic vibration defoaming and infrared ray drying treatment are carried out so as to obtain biological gel film with excellent performance, and thechitosan biological gel film production period is shortened greatly. According to the infrared drying method, genipin and chitosan are subjected to crosslinking reaction at a certain ratio, and glycerin is adopted for modification, the reaction is mild, is green, and is friendly to the environment. Compared conventional steam drying, the advantages are that: the infrared drying efficiency is high,the temperature is easy to control, heating is quick, resource is saved, and the safety is high.