Abstract: The present invention belongs to the technical field of stress detection and provides a method and device for testing stress of a high-temperature component of a power plant boiler. The adjusting assembly includes a plurality of bearing blocks, each bearing block is provided with an accommodating groove vertically, limiting blocks are disposed at two ends of the accommodating groove symmetrically, an elastic member, a first connecting rod, and a second connecting rod are disposed in the accommodating groove, and a limiting plate is fixedly connected to one end of each of the first connecting rod and the second connecting rod. According to the present invention, lengths of the first connecting rod and the second connecting rod extending out of the accommodating groove are adjusted, so that the device can be adjusted according to a caliber of a pipeline of the power plant boiler.

Abstract: The present disclosure provides a method for calculating wellbore friction resistance of a foam drainage gas production well. It is based on the conversion of the parameters of the gas-liquid two-phase flow Mukherjee & Brill model, it defines the liquid film reversal point as the zero friction resistance point, ignores the influence of the negative value of friction resistance, and uses this as a starting point to predict the change of friction resistance. The influence of liquid phase parameters and foaming agent concentration is taken into account in the friction resistance coefficient. An effective calculation method is obtained by combining the experimental data fitting and optimization. The present disclosure better characterizes the wellbore flow condition of the foam drainage gas production well, and provides important theoretical support for the prediction of the wellbore pressure drop of the foam drainage gas production well.

Abstract: A novel wireless technology, referred to as ZChirp, is proposed. ZChirp is based on the chirp modulation that has been used in the past, but with the key distinction of multiplying the chirp with a binary sequence called the Z sequence, which serves dual purposes. First, chirps multiplied with different Z sequences have very low cross-correlations, which significantly reduces demodulation errors due to interference and allows for multiple access. Second, a node can double the communication speed by multiplying different Z sequences depending on the data. Real-world experiments prove that multiplying the chirp with the Z sequence does not increase bandwidth usage or reduce the communication range. The Z sequences have been designed to reduce the interference and the computation complexity.

Abstract: A novel LPWAN technology includes a ZCNET node that transmit signals that occupy a very small fraction of the signal space, resulting in very low collision probabilities. ZCNET supports parallel root channels within a single frequency channel by using Zadoff-Chu (ZC) root sequences. The root channels do not severely interfere with each other, because the interference power is spread evenly over the entire signal space. ZCNET has its node randomly choose the transmission channel and range, while still achieving high packet receiving ratios such as 0.9 or above, because the load in each root channel is small.

Abstract: Provided are methods and apparatus for recovering collided packets in a wireless network, as well as for implementing block-based error correction techniques. In an example, provided is a method to recover collided packets by (A) assigning a peak of a collided packet to a respective packet by calculating a matching cost, per collided packet, from an amplitude of the peak and a time when the peak occurred, where the matching cost is determined from a combination of per-collided packet parameters including (i) respective estimated symbol boundaries of the collided packets, (ii) respective estimated Carrier Frequency Offsets of the collided packets, and (iii) a peak amplitude history of prior packets received from wireless network nodes, and (B) assigning, based on a respective packet in the collided packets having the parameters producing a lowest matching cost among the calculated matching costs, the peak to the respective packet.

Abstract: A novel LPWAN technology includes a ZCNET node that transmit signals that occupy a very small fraction of the signal space, resulting in very low collision probabilities. ZCNET supports parallel root channels within a single frequency channel by using Zadoff-Chu (ZC) root sequences. The root channels do not severely interfere with each other, because the interference power is spread evenly over the entire signal space. ZCNET has its node randomly choose the transmission channel and range, while still achieving high packet receiving ratios such as 0.9 or above, because the load in each root channel is small.

Abstract: A novel LPWAN technology includes a ZCNET node that transmit signals that occupy a very small fraction of the signal space, resulting in very low collision probabilities. ZCNET supports parallel root channels within a single frequency channel by using Zadoff-Chu (ZC) root sequences. The root channels do not severely interfere with each other, because the interference power is spread evenly over the entire signal space. ZCNET has its node randomly choose the transmission channel and range, while still achieving high packet receiving ratios such as 0.9 or above, because the load in each root channel is small.

Abstract: This disclosure describes a novel PRACH scheme based on an Analog Bloom Filter, in which user equipment is allowed to transmit multiple sequences to a base station, instead of only one sequence as is the case with the current LTE. A new decoding algorithm is disclosed, which copes with the unique challenges in the signal generated with ZC sequences, such as peak shifting and multiple peaks. In addition, when CFO can be removed the new scheme allows the UE to piggyback log 2 ? ? 7 bits of information along with the signal. Evaluation shows that the new scheme outperforms the existing PRACH of LTE by more than an order of magnitude in many cases, and therefore is a good candidate as the PRACH for future wireless networks (e.g., 5G).

Abstract: A novel LPWAN technology includes a ZCNET node that transmit signals that occupy a very small fraction of the signal space, resulting in very low collision probabilities. ZCNET supports parallel root channels within a single frequency channel by using Zadoff-Chu (ZC) root sequences. The root channels do not severely interfere with each other, because the interference power is spread evenly over the entire signal space. ZCNET has its node randomly choose the transmission channel and range, while still achieving high packet receiving ratios such as 0.9 or above, because the load in each root channel is small.

Abstract: Provided herein are systems and devices capable of detecting an event, such as the fall of a human. The devices may include a motion sensor, a heat sensor, and a vibration sensor. The devices and systems also may include an alarm and/or communication device configured to function when the event occurs.

Abstract: This disclosure describes a novel PRACH scheme based on an Analog Bloom Filter, in which user equipment is allowed to transmit multiple sequences to a base station, instead of only one sequence as is the case with the current LTE. A new decoding algorithm is disclosed, which copes with the unique challenges in the signal generated with ZC sequences, such as peak shifting and multiple peaks. In addition, when CFO can be removed the new scheme allows the UE to piggyback log 2 7 bits of information along with the signal. Evaluation shows that the new scheme outperforms the existing PRACH of LTE by more than an order of magnitude in many cases, and therefore is a good candidate as the PRACH for future wireless networks (e.g., 5G).

Abstract: Provided herein are systems and devices capable of detecting an event, such as the fall of a human. The devices may include a motion sensor, a heat sensor, and a vibration sensor. The devices and systems also may include an alarm and/or communication device configured to function when the event occurs.

Abstract: A system and method for the efficient compression of the Channel State Information (CSI) in a wireless network with very low complexity and implementation cost. In accordance with the present invention, the CSI can be approximated as the summation of very few sinusoids on constant frequencies and the parameters of the sinusoids can be found efficiently by very simple calculations such as dot products of vectors which are implementable in hardware at very low cost.

Abstract: L2Relay is a novel packet relay protocol for Wi-Fi networks that can improve the performance and extend the range of the network. A device running L2Relay is referred to as a relayer, which overhears the packet transmissions and retransmits a packet on behalf of the Access Point (AP) or the node if no acknowledgement is overheard. L2Relay is ubiquitously compatible with all Wi-Fi devices. L2Relay is designed to be a layer 2 solution that has direct control over many layer 2 functionalities such as carrier sense. Unique problems are solved in the design of L2Relay including link measurement, rate adaptation, and relayer selection. L2Relay was implemented in the OpenFWWF platform and compared against the baseline without a relayer as well as a commercial Wi-Fi range extender. The results show that L2Relay outperforms both compared schemes.

Abstract: L2Relay is a novel packet relay protocol for Wi-Fi networks that can improve the performance and extend the range of the network. A device running L2Relay is referred to as a relayer, which overhears the packet transmissions and retransmits a packet on behalf of the Access Point (AP) or the node if no acknowledgement is overheard. L2Relay is ubiquitously compatible with all Wi-Fi devices. L2Relay is designed to be a layer 2 solution that has direct control over many layer 2 functionalities such as carrier sense. Unique problems are solved in the design of L2Relay including link measurement, rate adaptation, and relayer selection. L2Relay was implemented in the OpenFWWF platform and compared against the baseline without a relayer as well as a commercial Wi-Fi range extender. The results show that L2Relay outperforms both compared schemes.

Abstract: The present embodiments provide a mechanism for selecting from among a plurality of initialization sequences to be executed as part of system startup. The present embodiments thus address the problem of certain initialization sequences not executing because they apply to the same function as another initialization sequence that is positioned ahead of the subject initialization sequence in storage of an adapter.