Abstract: A fluid-induced vibration energy harvesting apparatus with a non-rotating bluff body is provided. The apparatus does not use a common design method of rigidly securing a bluff body to an elastic beam in a design of the bluff body, but adopts a manner of connecting the bluff body and the elastic beam through a rotating shaft and a connecting shaft. Because a kinematic pair at a connection position is a rotating pair, the bluff body will only vibrate transversely and will not rotate, thereby achieving an effect of increasing an amplitude at the same frequency, and finally realizing an increase of converted electric energy and improving the conversion efficiency.

Abstract: An embodiment for analyzing and tracking data flow to determine proper schemas for unstructured data. The embodiment may automatically use a sidecar to collect schema discovery rules during conversion of raw data to unstructured data. The embodiment may automatically generate multiple schemas for different tenants using the collected schema discovery rules. The embodiment may automatically use ETL to export unstructured data to SQL databases with the generated multiple schemas for the different tenants. The embodiment may automatically monitor usage data of the SQL databases and collect the usage data. The embodiment may automatically optimize schema discovery using the collected usage data. The embodiment may automatically discover schemas with hot usage and apply the discovered schemas with hot usage to other tenants for consumption and further monitoring.

Abstract: A method, computer system, and a computer program product is provided for computer log management. In one embodiment, in response to receiving a log request from a user, an input content is analyzed and adjusted according to input contents and user's previous activities. A similarity analysis and a fairness analysis is performed to determine similarities between the input content, as adjusted, and a plurality of log records in an object library. The similarity analysis includes analyzing any patterns and attributes. The attributes have a dimension, and each dimension has a predefined weight (W). The fairness analysis ensures that one type of log is not favored over others. A best possible match is then determined, and one or more logs are presented to the user providing the best possible match.

Abstract: One or more computer processors generate a debug chain from one or more similar resource bound breakpoints, wherein the debug chain provides dynamic code flow. The one or more computer processors distribute the generated debug chain to one or more tenants.

Abstract: A disclosed database system and enhanced methods implement enhanced mini-plans and dynamically changing a query mini-plan with trustworthy Artificial Intelligence (AI) to improve query execution performance in a database system. An AI cost model evaluates candidate mini-plans for executing a query. AI truth monitors evaluate the execution of the mini-plans, such as predicted input factors and adjusted mini-plans of one or more AI running data models. The AI truth monitors provide feedback to adjust the AI cost model based on evaluating the execution of the mini-plans. The AI truth monitors validate adjusted mini-plans, provide feedback to the AI cost model with improved overall prediction accuracy, and enhanced mini-plans to gain query performance.

Abstract: An embodiment includes generating a partition schema for a distributed database based on historical usage data indicative of usage of the distributed database, where the generating of the partition schema comprises determining a partition range of a partition of the partition schema. The embodiment also includes generating a node identifier for the partition using a hash function and a first weight value assigned to the partition. The embodiment also includes monitoring performance data indicative of a performance of the distributed database, the monitoring comprising detecting a failure of the performance to satisfy a performance threshold. The embodiment also includes initiating, responsive to detecting the failure, a redistribution procedure by changing the node identifier of the partition by replacing the first weight value with a second weight value.

Abstract: A fluid-induced vibration energy harvesting apparatus with a non-rotating bluff body is provided. The apparatus does not use a common design method of rigidly securing a bluff body to an elastic beam in a design of the bluff body, but adopts a manner of connecting the bluff body and the elastic beam through a rotating shaft and a connecting shaft. Because a kinematic pair at a connection position is a rotating pair, the bluff body will only vibrate transversely and will not rotate, thereby achieving an effect of increasing an amplitude at the same frequency, and finally realizing an increase of converted electric energy and improving the conversion efficiency.

Abstract: An optoelectronic semiconductor structure is revealed. The optoelectronic semiconductor structure includes a substrate, a first electrode, an electrode contact, a semiconductor layer, and a second electrode. After a photoactive layer of the semiconductor structure absorbs energy from a light source to generate an exciton, the exciton dissociates into a first carrier and a second carrier. The first carrier is transferred to the first electrode through the first interface layer while the second carrier is transferred from the second electrode to the electrode contact directly by a tunneling effect.

Abstract: The present invention relates to: a paper-based surface-enhanced Raman scattering (SERS) substrate comprising metal nanoparticles, which are uniformly distributed and adsorbed on a designed pattern and have a diameter of 1 nm to 100 nm; a point-of-care (POC) diagnostic kit, comprising the paper-based SERS substrate; and a method for preparing the paper-based SERS substrate.

Abstract: The present invention relates to: a paper-based surface-enhanced Raman scattering (SERS) substrate comprising metal nanoparticles, which are uniformly distributed and adsorbed on a designed pattern and have a diameter of 1 nm to 100 nm; a point-of-care (POC) diagnostic kit, comprising the paper-based SERS substrate; and a method for preparing the paper-based SERS substrate.

Abstract: Disclosed is an active energy harvesting device. The device includes a rigid body configured to vibrate corresponding to vibration of an external vibration body and including a first end at which an energy harvesting structure is provided to convert mechanical energy into electric energy, a magneto-rheological material provided at a second end of the rigid body to be bound to the rigid body and including a material which is changed in elastic force according to the surrounding magnetic field strength, a fixing unit for binding the second end of the rigid body and the magneto-rheological material and connecting the rigid body to the external vibration body, and a first permanent magnet arranged symmetrically apart from the magneto-rheological material while interposing the magneto-rheological material therebetween and provided so as to adjust a gap from the magneto-rheological material and change an elastic coefficient of the magneto-rheological material according to the gap.

Abstract: Disclosed is an active energy harvesting device. The device includes a rigid body configured to vibrate corresponding to vibration of an external vibration body and including a first end at which an energy harvesting structure is provided to convert mechanical energy into electric energy, a magneto-rheological material provided at a second end of the rigid body to be bound to the rigid body and including a material which is changed in elastic force according to the surrounding magnetic field strength, a fixing unit for binding the second end of the rigid body and the magneto-rheological material and connecting the rigid body to the external vibration body, and a first permanent magnet arranged symmetrically apart from the magneto-rheological material while interposing the magneto-rheological material therebetween and provided so as to adjust a gap from the magneto-rheological material and change an elastic coefficient of the magneto-rheological material according to the gap.

Abstract: A portable electronic device and a charging method thereof are disclosed. The portable electronic device comprises an electronic device main body, a power storage module, a moving module, and a first solar panel. The power storage module is used for providing the power for the electronic device main body. The first solar panel is electrically coupled with the power storage module and the first solar panel can move together with the moving module for moving the first solar panel outward. The charging method comprises: detecting a power value of the power storage module; determining whether the power value of the power storage module is under a first specific value; when the power value of the power storage module is under the first specific value, moving the first solar panel outward to charge the power storage module.

Abstract: A system and method including a trading card and a recording and/or reproducing apparatus recording and/or reproducing subject-related data to/from the trading card, wherein the subject-related data comprises picture information characterizing a subject or reminding a user of the subject. The recording and/or reproducing apparatus includes a transmission and reception unit transmitting subject-related data to and receiving subject-related data from the trading card and a memory unit storing the subject-related data provided through the transmission and reception unit. A key controller in the recording and/or reproducing apparatus inputs a user's manipulation commands and a decoder decodes the picture information from the subject-related data stored in the memory and generating a video signal corresponding to the picture information. A display unit displays the video signal.

Abstract: A method for designing and tuning a refractive index of a magnetic fluid is performed by adjusting some characteristic parameters. The characteristic parameters include the type of carrier, the type of magnetic particles, the concentration of the magnetic ingredient; the wavelength of an intended light onto the magnetic fluid layer; the strength of applied magnetic field; the sweep rate of the magnetic field; the direction of the applied magnetic field; the strength of applied magnetic field associated with the thickness of the magnetic fluid layer; and the strength of applied magnetic field associated with the temperature. A magnetic fluid with a designed value of refractive index under zero magnetic field is synthesized by carefully selecting the carrier and the volume concentration of the magnetic particles, and this value can further be tuning around the designed value by changing the forgoing characteristic parameters.

Abstract: A method for designing and tuning a refractive index of a magnetic fluid is performed by adjusting some characteristic parameters. The characteristic parameters include the type of carrier, the type of magnetic particles, the concentration of the magnetic ingredient; the wavelength of an intended light onto the magnetic fluid layer; the strength of applied magnetic field; the sweep rate of the magnetic field; the direction of the applied magnetic field; the strength of applied magnetic field associated with the thickness of the magnetic fluid layer; and the strength of applied magnetic field associated with the temperature. A magnetic fluid with a designed value of refractive index under zero magnetic field is synthesized by carefully selecting the carrier and the volume concentration of the magnetic particles, and this value can further be tuning around the designed value by changing the forgoing characteristic parameters.

Abstract: A system and method including a trading card and a recording and/or reproducing apparatus recording and/or reproducing subject-related data to/from the trading card, wherein the subject-related data comprises picture information characterizing a subject or reminding a user of the subject. The recording and/or reproducing apparatus includes a transmission and reception unit transmitting subject-related data to and receiving subject-related data from the trading card and a memory unit storing the subject-related data provided through the transmission and reception unit. A key controller in the recording and/or reproducing apparatus inputs a user's manipulation commands and a decoder decodes the picture information from the subject-related data stored in the memory and generating a video signal corresponding to the picture information. A display unit displays the video signal.