The present invention relates to an access control system, an access object and a method for access control. The access control system comprises an access request receiving device being configured and operable for receiving an access object; the access request receiving device comprising an emitter configured and operable for irradiating the access object with a radiation having a wavelength in the range of about 10″12 and 10″9 m and a detector configured and operable for detecting a response signal from the irradiated access object; a control circuit being configured and operable to receive the response signal from the access request receiving device and process the response signal to identify spectral features indicative of an XRF signature of the access object; wherein the control circuit is adapted to generate an unlocking signal for switching a module device between a locked state and an unlocked state upon identification of the XRF signature.

The present invention relates to an access control system, an access object and a method for access control. The access control system comprises an access request receiving device being configured and operable for receiving an access object; the access request receiving device comprising an emitter configured and operable for irradiating the access object with a radiation having a wavelength in the range of about 10″12 and 10″9 m and a detector configured and operable for detecting a response signal from the irradiated access object; a control circuit being configured and operable to receive the response signal from the access request receiving device and process the response signal to identify spectral features indicative of an XRF signature of the access object; wherein the control circuit is adapted to generate an unlocking signal for switching a module device between a locked state and an unlocked state upon identification of the XRF signature.

An in-situ test device and method for surrounding rock strength of bolt supported roadway is provided. The test device includes a fixing mechanism, a loading mechanism, a measuring mechanism and a control system. The loading mechanism includes a hydraulic pump and a plunger pump, the hydraulic pump drives the plunger pump to work and controls the lifting speed of the loading cylinder; the measuring mechanism includes an infrared ranging unit and a wireless pressure monitoring unit; the control system controls the work of the loading mechanism and processes the monitoring data. The test device is directly installed in the roadway and fixed with the bolt. The device is loaded after leveling, the device is disassembled after the monitoring data are obtained, and the in-situ test for the surrounding rock strength of the bolt supported roadway is completed. The steps are simple and adaptable.

A method and system for selecting chemical reagents in measurement of asphalt surface energy are provided. The method includes: selecting different chemical reagents and obtaining contact angle values formed between the respective chemical reagents and asphalt slides; obtaining asphalt surface energy parameters corresponding to each of combinations of the chemical reagents according to the contact angle values; obtaining variation coefficients of the asphalt surface energy parameters corresponding to each of the combinations of the chemical reagents and selecting a group of combinations of the chemical reagents according to the variation coefficients; and obtaining numbers of abnormal values of asphalt surface energy components in the group of combinations of the chemical reagents and obtaining a target combination of the chemical reagents according to the numbers of the abnormal values. The combination of the chemical reagents with high stability of testing data can be selected by using the method.

A method and system for selecting chemical reagents in measurement of asphalt surface energy are provided. The method includes: selecting different chemical reagents and obtaining contact angle values formed between the respective chemical reagents and asphalt slides; obtaining asphalt surface energy parameters corresponding to each of combinations of the chemical reagents according to the contact angle values; obtaining variation coefficients of the asphalt surface energy parameters corresponding to each of the combinations of the chemical reagents and selecting a group of combinations of the chemical reagents according to the variation coefficients; and obtaining numbers of abnormal values of asphalt surface energy components in the group of combinations of the chemical reagents and obtaining a target combination of the chemical reagents according to the numbers of the abnormal values. The combination of the chemical reagents with high stability of testing data can be selected by using the method.

Methods, systems, and computer program products for determining a property of construction material. According to one aspect, a material property gauge operable to determine a property of construction material is disclosed. The gauge may include an electromagnetic sensor operable to measure a response of construction material to an electromagnetic field. Further, the electromagnetic sensor may be operable to produce a signal representing the measured response by the construction material to the electromagnetic field. An acoustic detector may be operable to detect a response of the construction material to the acoustical energy. Further, the acoustic detector may be operable to produce a signal representing the detected response by the construction material to the acoustical energy. A material property calculation function may be configured to calculate a property value associated with the construction material based upon the signals produced by the electromagnetic sensor and the acoustic detector.

Methods, systems, and computer program products for determining a property of construction material. According to one aspect, a material property gauge operable to determine a property of construction material is disclosed. The gauge may include an electromagnetic sensor operable to measure a response of construction material to an electromagnetic field. Further, the electromagnetic sensor may be operable to produce a signal representing the measured response by the construction material to the electromagnetic field. An acoustic detector may be operable to detect a response of the construction material to the acoustical energy. Further, the acoustic detector may be operable to produce a signal representing the detected response by the construction material to the acoustical energy. A material property calculation function may be configured to calculate a property value associated with the construction material based upon the signals produced by the electromagnetic sensor and the acoustic detector.

An asphalt density estimation system includes a measurement device configured to output a measurement signal; a time synchronization unit configured to sample the measurement signal to obtain a sampled measurement signal and identify periodic sampling points of the sampled measurement signal across a plurality of periods. The system also includes a time synchronous averaging unit configured to construct a modified measurement signal in the time domain by: for at least one sampling point within the period, averaging a plurality of the periodic sampling points across periods to obtain an average periodic data point for the at least one sampling point, and constructing the modified measurement signal using the average periodic data point for the at least one sampling point. The system further includes a density calculation unit configured to determine asphalt density values based on the modified measurement signal; and a display unit configured to display the determined asphalt density values.

Disclosed is a design reference value quantification method for a modifier dosage of modified asphalt. A curve of unsaturation degree of the modified asphalt as a function of the modifier dosage is plotted, in which the unsaturation degree of a series of modified asphalts is determined by potentiometric titration; further, an inflection point of the unsaturation degree of the modified asphalt as a function of the modifier dosage in the asphalt is obtained by data fitting and analysis, and a reference value of the dosage of the modifier added in the process design of the modified asphalt is established.

Disclosed is a design reference value quantification method for a modifier dosage of modified asphalt. A curve of unsaturation degree of the modified asphalt as a function of the modifier dosage is plotted, in which the unsaturation degree of a series of modified asphalts is determined by potentiometric titration; further, an inflection point of the unsaturation degree of the modified asphalt as a function of the modifier dosage in the asphalt is obtained by data fitting and analysis, and a reference value of the dosage of the modifier added in the process design of the modified asphalt is established.