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49results about How to "Various forms" patented technology
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Assembly type reinforced concrete-steel structure foundation pit supporting system convenient to disassemble and construction technology
PendingCN119640814AEasy to removeReduce supporting costsExcavationsBulkheads/pilesSupporting systemConcrete beams
The invention relates to the field of constructional engineering, and discloses an assembly type reinforced concrete-steel structure foundation pit supporting system convenient to disassemble and a construction technology, and the assembly type reinforced concrete-steel structure foundation pit supporting system comprises a top beam, a waist beam, a supporting pile and an inner supporting system; the inner supporting system is formed by assembling a standard steel-concrete beam section main support and a steel member auxiliary support in cooperation with a jack adjusting system. The invention further provides a new system on-site assembly construction process, namely detailed steps of assembly construction from the uppermost layer to the lower layer step by step. The fabricated structure integrates the advantages of two fabricated structures, is suitable for foundation pit supporting with large stress and strict deformation control, and has the advantages of being high in construction speed, short in construction period, low in construction cost, convenient to dismantle and capable of completely recycling most of inner supporting components compared with a traditional cast-in-place steel-concrete foundation pit supporting system.
Owner:THE FIRST COMPARY OF CHINA EIGHTH ENG BUREAU LTD +2
Take-up device for charging gun cable of new energy automobile AC / DC charging pile
ActiveCN222630749Uvarious formsAvoid mopping wear and tearVehicular energy storageNew energyStructural engineering
A take-up device for a charging gun cable of a new energy automobile alternating current and direct current charging pile is installed at a charging pile body or an installation position outside the charging pile body, and the take-up device comprises a traction rope, an arc-shaped wire clamping device, a winding drum assembly and a linkage stepless reversing locker. One end of the traction rope is connected with the winding drum assembly, the other end of the traction rope is connected with the arc-shaped wire clamp, the arc-shaped wire clamp clamps the middle section position of the charging pile gun wire cable, and the other end of the charging pile gun wire cable is connected with the charging gun; and the linkage stepless reversing locker is fixedly mounted in the large winding drum. The take-up device is added on the basis of the existing wall-mounted, column-type, cabinet-type, alternating-current and direct-current single and double-gun charging piles, so that the take-up device can be used by a single charging gun or can be used by double charging guns at the same time. And the charging pile can be mounted inside or outside the charging pile body and can also be separately mounted with the charging pile body, so that the charging pile is diversified in form.
Owner:YANCHENG DATANG RUIER AUTO EQUIP CO LTD
Coke residue feature detection method and system based on image and pressure alignment
PendingCN121767721Aavoid damageImprove detection accuracyCharacter and pattern recognitionBiological modelsMental healthEngineering
The invention discloses a coke residue feature detection method and system based on image and pressure alignment, and solves the problems that the subjectivity is high, the accuracy is difficult to guarantee and the physical and psychological health of detection personnel is influenced when coke residue feature detection is manually carried out in the prior art. The method comprises the steps of collecting a coke residue image and pressure data, performing preprocessing to form image input and pressure input, and constructing sample data; a neural network model is constructed, image features of image input are extracted by the image coding layer, pressure features of pressure input are extracted by the pressure coding layer, and the image features and the pressure features are fused and then are subjected to coke residue classification through a classifier; constructing a model comprehensive loss function; inputting sample data for training to obtain a coke residue classification model; and deploying the model, and inputting the to-be-detected coke residue image and the pressure data into the model to obtain a coke residue classification result. According to the method, the neural network is fully utilized, the image and the pressure are effectively fused, information complementation and integration are realized, and the classification detection precision of the coke residues is effectively improved.
Owner:ZHEJIANG BAIMA LAKE LABORATORY CO LTD
Electric invisible folding bed matched with office table
The utility model relates to the technical field of electric invisible folding beds matched with office tables, and provides an electric invisible folding bed matched with an office table, which can improve the comfort and convenience of office workers during rest. The main table is provided with a storage bin used for storing the bed body and a folding device used for automatically unfolding or folding the bed body into the storage bin. The side face of the bed body is hinged to the inner wall of the storage bin; the folding device comprises a telescopic driver, the bottom of the telescopic driver is hinged to the inner wall of the storage bin, and an output shaft of the telescopic driver is hinged to the bed body.
Owner:FOSHAN BIFEI HOME TECH CO LTD
Ferroelectric metal and method of making and using same
ActiveCN121377028Bachieve reversalEfficient coexistence of ferroelectricityPolycrystalline material growthBy pulling from meltCubic silicon carbidePhysical chemistry
The application provides a ferroelectric metal and a preparation method and application thereof. The ferroelectric metal of the application is composed of cubic silicon carbide crystals and doping elements doped therein, wherein the concentration of the doping elements is greater than or equal to 1*10 18 cm ‑3 The material of the application can be prepared by a chemical vapor deposition method, a high-temperature solution growth method, a solid-phase sintering method, a pulse laser deposition method and the like. Since the conductivity of metal, the switching characteristics of ferroelectric and the force-electric coupling characteristics of piezoelectric are integrated, the ferroelectric metal of the application has great application value in the fields of high-performance transducers, high-sensitivity sensors, low-power micro-electro-mechanical system (MEMS), next-generation multifunctional electronic devices and the like.
Owner:INSTITUTE OF PHYSICS CHINESE ACADEMY OF SCIENCES
A quick-change blade shovel
PendingCN122250866AReduce replacement timeeasy to operateCarpet cleanersFloor cleanersStructural engineeringKnife blades
Owner:HENAN JIANGHUA IND TECHNOLOGY CO LTD
Vibration damping devices for marine risers and submarine cables
ActiveCN224283692Uclever thinkingsimple structureCable installations on groundPipe laying and repairVibration controlMechanical engineering
This utility model belongs to the technical field of marine oil and gas and power development equipment, and discloses a vibration damping device for marine risers and submarine cables. The device includes a damping cylinder, a positioning component, a support rod, a sleeve half-ring, bolt holes, and bolts. The damping cylinder is rigidly connected to the sleeve half-ring via the support rod and consists of two symmetrical half-cylinder structures, which are bolted together and fitted around the marine riser or submarine cable. The positioning component can be quickly installed and removed, providing reliable axial positioning for the vibration damping device. This utility model achieves efficient vibration reduction based on the synergistic mechanism of added mass efficiency and hydrodynamic damping energy dissipation. It has a simple structure, convenient and diverse installation methods, and is unaffected by ocean current direction or component attitude, making it widely applicable to vibration control of marine pipelines.
Owner:DALIAN UNIV OF TECH
X-shaped magnetic induction type scissor key and mechanical keyboard
PendingCN119542052Alow costThe overall structure is simple and reliableElectric switchesEmergency protective devicesKey pressingSoftware engineering
The invention discloses an X-shaped magnetic induction type scissor foot key and a mechanical keyboard, the key is of an integral module type structure or a single module type structure, mature X-shaped scissor feet are utilized in the two structures, the X-shaped scissor feet are ingeniously combined with a unipolar magnetic induction chip, and the anti-interference performance is good. The magnetic induction type scissor foot key of the overall modular structure is well compatible with an existing scissor foot layout structure, meanwhile, the keyboard key is changed into a magnetic induction mode, and the service life of the key is greatly prolonged. The magnetic induction type scissor foot key of the single module type structure is flexible and convenient, and a keyboard formed by the key is long in service life and diverse in form. According to the invention, the keycap is pressed to move, the magnet passes through the magnetic pole horizontal induction critical surface of the unipolar magnetic induction chip, the magnetic pole of the magnet is reversed, the high level output by the unipolar magnetic induction chip is changed into the low level, the corresponding digital logic is changed into 0 from 1, and the natural switch attribute is realized.
Owner:SHENZHEN XINHEYUN ELECTRONIC TECHNOLOGY CO LTD
Multi-anchor fixture, multi-anchor adjustment system, and vehicle
PendingCN122585095Avarious forms
This application relates to a multi-anchor point fixing device, a multi-anchor point adjustment system, and a vehicle, belonging to the field of automotive component technology. The multi-anchor point fixing device, used in the trunk of a vehicle, includes: a retraction assembly disposed within the trunk, the retraction assembly comprising a drive component, a retraction wheel, a rope, and a sensor; the retraction wheel being connected to the drive end of the drive component, the rope being wound around the retraction wheel, and the retraction wheel being able to release or retract the rope under the drive of the drive component; and multiple anchor points disposed within the trunk, each anchor point having a connecting portion for rope connection. This application solves the technical problem that existing trunk restraint accessories have limited functionality and cannot meet the diverse usage needs of users.
Owner:CHONGQING LANDIAN AUTOMOBILE TECHNOLOGY CO LTD
An intention-guided push method and system based on geographic location information and multimedia interaction
ActiveCN119357480BImprove satisfactionhigh acceptanceDigital data information retrievalBiological modelsPersonalizationQuality of service
The present invention provides an intention-guided push method and system based on geographic location information and multimedia interaction, by constructing an interest model based on geographic fence technology and deep neural network; generating user activity intention prediction results based on the interest model, using Bayesian network and time series prediction algorithm based on the user activity intention prediction results to obtain behavior rhythm analysis results, based on determining the best push timing of the behavior rhythm analysis results, using graph theory algorithm to construct a user and location relationship map to generate a time sensitivity optimization plan; based on the time sensitivity optimization plan, generating customized content, using sentiment analysis method, collaborative filtering algorithm, autoencoder and multi-head attention mechanism to process the customized content to obtain final content, adjusting the final content through an instant feedback mechanism, and generating a multimedia push package; the present invention improves the performance and service quality of the intelligent push system, and provides users with a more accurate and personalized recommendation experience.
Owner:BEIJING JIUJIA XINTONG TECH CO LTD
An open type combined electrical appliance
ActiveCN119170432Breduce in quantitySimple structureProtective switch detailsContact driving mechanisms
The present invention relates to an open type combined electrical appliance, comprising a base; a circuit breaker assembly installed on the base, comprising a circuit breaker bracket, a circuit breaker grounding terminal, a tank body, a circuit breaker support insulator, an external mutual inductor and a static contact of an isolating switch; an isolating switch assembly installed on the base, comprising an isolating switch bracket, an isolating switch grounding terminal, an isolating switch support insulator, a conductive bar, an isolating switch moving contact and a pull rod; a grounding rod is also arranged on the side of each circuit breaker support insulator matched with the isolating switch support insulator, and a grounding contact matched with the grounding rod is installed on the circuit breaker support insulator; each pull rod is driven by a first linkage mechanism to synchronously lift and lower, and each ground rod is driven by a second linkage mechanism to synchronously rotate. The combined electrical appliance of the present invention realizes the synchronous swinging of each pull rod and each ground rod respectively through the cooperation of the first linkage mechanism and the second linkage mechanism, which greatly reduces the number of required intermediate transmission rods, simplifies the structure, and makes the operation more convenient.
Owner:JIANGSU RUGAO HIGH VOLTAGE ELECTRIC APP
An electrolytic color-based water-volte effect simulation device
This invention relates to the field of simulation demonstration devices, providing a water-voltaic effect simulation device based on electrolytic color development, comprising a water-voltaic power generation module and an electrolytic color development module. The water-voltaic power generation module includes a water-voltaic effect thin film and a circulation mechanism, while the electrolytic color development module includes a transparent electrolytic cell, an inert electrode pair, and a standard electrolyte. The weak electrical signal generated by the water-voltaic power generation module is directly applied to the inert electrode pair, directly driving the electrolytic reaction within the transparent electrolytic cell without the need for external amplification circuitry. The electrolytic color development module simultaneously displays the instantaneous power and accumulated charge of the water-voltaic power generation module through the cathode bubble generation rate and the color change area of the acid-base indicator near the cathode. This invention requires no external power supply amplification, intuitively demonstrates the conversion relationship between electrical energy and chemical energy, supports multi-water quality variable control experiments, and is suitable for teaching demonstrations in university physics, materials, and environmental courses.
Owner:SUZHOU UNIV OF SCI & TECH
Deployment method and application terminal based on digital culture field big data model
InactiveCN119622039AEfficient Data ManagementImprove Data Management EfficiencyInternal combustion piston enginesOther databases indexingDigital cultureEngineering
The invention relates to a deployment method, an application terminal and a query method based on a digital culture field big data model. The deployment method comprises a data preparation stage, a model training stage and a model deployment stage. According to the method, model training and analysis processing are performed on the data in the digital culture field in a targeted manner, and the data asset management efficiency in the digital culture field can be greatly improved.
Owner:CHINA DIGITAL CULTURE GRP CO LTD
A multifunctional scooter
The present invention relates to the technical field of scooters, and discloses a multifunctional scooter, which comprises: a support plate, which serves as a bearing body when a user uses the multifunctional scooter; a first pulley part, which is connected to the rear end of the support plate; a second pulley part, which has a single-wheel structure and a double-wheel structure, and the second pulley part is detachably mounted on the rear end of the support plate; a switching mechanism, which is fixedly connected to the front end of the support plate and buckled with the second pulley part; an electronic control part, which is mounted on the bottom surface of the support plate; and a remote controller, which is used by the user to send control instructions to the electronic control part to control the movement of the multifunctional scooter. The beneficial effects of implementing the present invention are: the functions of pulley number conversion, intelligent remote control drive, and switching between toy type and sports type can be realized, and the multifunctional scooter has rich and varied functions and forms, which improves the user experience, reduces the purchase burden, and reduces resource waste.
Owner:SHENZHEN AOTU INTELLIGENT TECH CO LTD
Novel boron carrier, preparation method and pharmaceutical formulation thereof
ActiveEP4324836A4quality improvementhigh activityBoron compound active ingredientsGroup 3/13 element organic compounds
Disclosed in the present invention are a novel boron carrier, a preparation method and a pharmaceutical formulation thereof; in particular, the present invention relates to 3,4-dihydro-3-methyl-4-oxoimidazo[5,1-D]-1,2,3,5-tetrazine-8-carboxylic acid [4-(4,4,5,5-tetramethyl-1,3,2-diaza-borolan-2-yl)phenyl ester, a preparation method and a pharmaceutical formulation thereof. The boron carrier compound (I) of the present invention has the advantages of stable quality, has excellent activity compared with the same type of medicines, is suitable for being developed as a novel boron carrier, and is suitable for preparing various forms of pharmaceutical formulations. Therefore, the boron carrier of the present invention has a good application prospect in preparation of medicines for treating tumors.
Owner:PEKING UNIV
A low-salt tender deer meat vacuum tumbling processing method for group meals
This invention relates to a low-salt, tenderizing vacuum tumbling processing method for venison intended for group catering, belonging to the field of meat product processing technology. The method includes raw material pretreatment, preparation of a low-salt nutrient marinade, vacuum tumbling, intermediate settling, a second-stage intermittent tumbling, low-temperature settling and marinating, shaping and heat processing, and cooling and storage. Its advantages include achieving tenderness and moisture retention under low-salt conditions, ensuring that the product maintains good taste and appearance even after heat processing in a central kitchen, followed by refrigeration / freezing and reheating. It is suitable for the process conditions of centralized reheating equipment in group catering, enhances nutritional value, diversifies product forms, and is easy to industrially promote, showing good prospects for industry application.
Owner:JILIN DINGBANG CATERING SERVICE CO LTD
Saddle component for training PC muscle
PendingCN119636966Arich varietyvarious formsCycle saddlesPhysical medicine and rehabilitationMassage
The invention relates to the technical field of bicycle saddle sleeves, and discloses a saddle component for training PC muscle, which comprises a saddle sleeve, and a massage body is arranged on the saddle sleeve. According to the saddle component for training the PC muscles, when a rider rides a bicycle, the massage bodies and the PC muscles of the human body part are massaged at the moment, especially when the bicycle rides a mountain bike, due to the fact that the mountain bike can jolt to a certain degree on a road or a rugged road, the massage bodies can make contact with the PC muscles of the human body part more frequently, and the purpose of training the PC muscles is achieved; therefore, a certain area of the body part of a rider can be massaged, and the purpose of training PC muscles can be achieved.
Owner:邯郸市锐动自行车配件有限公司
Pencil-type circulating fountain
The utility model relates to a fountain equipment technical field, especially a pencil type circulating fountain, including the pen point, the pen point top outer wall fixedly connected rotating base, rotating base inner wall fixedly connected first motor, first motor output fixedly connected gear, the rotating base inner wall has set up first sliding slot, the rotating base top outer wall sliding connection pen barrel outer wall, the pen barrel inner wall is fixedly provided with the toothed disc, the toothed disc is engaged with the gear, the utility model discloses through starting the first motor in rotating base, drives the gear and toothed disc engagement transmission, drives pen barrel rotation. The waterproof color light bar of pen barrel outer wall synchronous display changeable light, create the visual effect of dynamic and gorgeous multicolored, make the fountain become the visual focus, simultaneously, the atomizer and the spray head that added, let the fountain on the basis of traditional water flow injection, add the landscape level that water mist diffuses and rain curtain sprays, the form and the texture of the fountain are enriched.
Owner:GUANGZHOU HAOZHIQUAN WATER PARK EQUIP CO LTD
Miniature robot dog structure
The utility model discloses a mini robot dog structure, including main part and four leg parts, the leg part rotation is arranged on the main part, be provided with four drive mechanisms in the main part, four drive mechanisms each with a leg part is connected, four leg parts can rotate respectively, and the flexibility is higher, the leg part includes front casing, rear casing and soft rubber antiskid part, and the front casing is connected through screw with rear casing, and the soft rubber antiskid part is arc, can promote the continuity of movement and enhance the adaptability of robot dog in complex terrain, the outer surface of soft rubber antiskid part is provided with a plurality of antiskid grooves laterally, can enhance the antiskid effect, and the front and rear sides of soft rubber antiskid part extend outward and form the clamping part, the bottom of front casing and rear casing is provided with the installation port matched with soft rubber antiskid part, the inboard of installation port is provided with the clamping groove, and the clamping part is placed into the clamping groove, and can be replaced individually after the wear failure of soft rubber antiskid part, to reduce the maintenance cost.
Owner:刘家勇
OPC model training methods and equipment
ActiveCN121725085Bvarious formsComply with design rulesImage enhancement2D-image generationTest graphAlgorithm
This application provides an OPC model training method and an OPC model training device, relating to the field of model training technology. The method includes: cutting a chip design layout file to obtain multiple basic blocks; adding noise to the multiple basic blocks to obtain multiple noisy blocks; training a graph generator based on the multiple noisy blocks and corresponding real noise; using the graph generator to generate multiple test graphs based on multiple preset noise vectors; and training the model based on the multiple test graphs to obtain an OPC model. By training the graph generator based on the multiple noisy blocks and corresponding real noise, the graph generator implicitly learns the data distribution of the graphs, that is, it learns the rules of chip design. This results in multiple test graphs generated by the graph generator having more diverse forms and conforming to design rules. The OPC model trained based on these multiple test graphs is also more accurate and reliable.
Owner:YIXIN TECH (HANGZHOU) CO LTD
A spiral acoustic black hole noise reduction module and a design method thereof
PendingCN122695957AImprove sound absorption performanceImprove dissipation efficiency
The application relates to the field of noise reduction technology and discloses a spiral acoustic black hole noise reduction module and a design method thereof, which comprises a shell layer, an acoustic black hole cavity and a neck pipe; the shell layer is used for wrapping the acoustic black hole cavity to form a closed space; the acoustic black hole cavity comprises an acoustic black hole cavity plate curved according to an Archimedes spiral line and a rib plate array; the neck pipe is arranged at the rotation center position of the spiral line track of the acoustic black hole cavity plate, and the neck pipe is a sound wave incidence pipe; the rib plate array comprises a plurality of rib plates arranged in an increasing or decreasing length; one end of each rib plate is fixed to the inner side of the acoustic black hole cavity plate, and the other end is a free end; the rib plates are arranged at equal arc lengths / distances, and the lengths are arranged in a monotonically decreasing or increasing rule to form an acoustic black hole structure. The application realizes the sound absorption effect of ultralow frequency with a small size, reaches a sound absorption peak under specific frequency, and enhances the sound absorption effect of the sound absorption device in a specific frequency band.
Owner:SOUTHEAST UNIV
Transverse Aureobasidium racemosum and application thereof and preparation method of fungal chitosan
PendingCN121975639Avarious formshigh purityFungiMicroorganism based processesBiotechnologyMicroorganism
The invention discloses trachycarpus racemosus and application thereof and a preparation method of fungal chitosan, and belongs to the technical field of biology and application thereof. The strain is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.42357, and the preservation date is December 10, 2025. The bacterial strain disclosed by the invention is Lichtheimia ramosa BT-0-A-001-JZ-001 separated from a wine brewing environment, and fungal chitosan with high purity and high deacetylation degree can be extracted by culturing the Lichtheimia ramosa BT-0-A-001-JZ-001. As an effective source of chitosan, the problem that traditional chitosan extraction excessively depends on fishery resources is solved, and the problem that raw materials for producing chitosan are limited is solved.
Owner:CHENGDU BOTENG PHARMACEUTICAL TECHNOLOGY CO LTD
Wood veneer modeling combined showcase integrated with display screen
ActiveCN224125628Uvarious formsAchieve professional showcase characteristicsShow cabinetsIdentification meansWood veneerInterior space
The utility model discloses a wood veneer modeling combined showcase integrated with a display screen, which comprises a showcase body, an installation cavity is arranged in the showcase body, a through hole is arranged on the showcase body, and one end of the through hole extends to the installation cavity; the constant temperature machine is arranged in the mounting cavity; the glass showcase is arranged on the cabinet body, and the inner space of the glass showcase is communicated with the outlet pipe of the constant temperature machine through the through hole. Compared with the prior art, hidden installation of the constant-temperature machine can be achieved, the requirement for constant temperature of the showcase is met, exhibition forms are diversified, and the whole showcase is clean, tidy and attractive.
Owner:SUZHOU GOLD MANTIS EXHIBITION DESIGN ENG
View meter device and field-of-view detection method
PendingCN121943185Apointing accuratelyAccurate brightnessEye diagnosticsOptical stimulationMechanical engineering
The invention discloses a perimeter device and a view detection method, and relates to the technical field of medical detection.The perimeter device comprises a shell, a light source, a digital micromirror device, an imaging unit, an image acquisition unit and a controller; the digital micro-mirror device is arranged in the shell and is used for receiving light emitted by the light source and then generating an optical stimulation pattern; the imaging unit is installed in the shell and used for projecting the optical stimulation pattern to the eye fundus of the human eye for imaging; the image acquisition unit is mounted in the shell and is used for acquiring image data of human eyes; the controller is electrically connected with the image sensor and the digital micro-mirror device and used for calculating the rotation angle of the eyeball according to the image data of the human eyes and adjusting the position, where the optical stimulation graph is generated, on the digital micro-mirror device according to the rotation angle of the eyeball. And the image of the optical stimulation pattern projected to the eye fundus of the human eye through the imaging unit moves along with the eyeball.
Owner:北京九辰智能医疗设备有限公司
Preparation method of low-caffeine tea water and low-caffeine tea powder
The invention belongs to the technical field of food processing, and particularly relates to a treatment method for removing caffeine from tea water, in particular to a preparation method of low-caffeine tea water capable of effectively reducing the caffeine content in the tea water and well keeping original flavor substances of tea leaves, and a preparation method of low-caffeine tea powder prepared on the basis of the method. The method specifically comprises the following steps: taking tea leaf powder as a raw material, soaking the tea leaf powder in cold water, extracting and removing caffeine in tea water by using dichloromethane to obtain low-caffeine tea water, and finally removing water to obtain the low-caffeine instant tea powder. The method is low in production cost and easy to industrially popularize and apply.
Owner:BEIJING INST OF TECH
Multi-form changeable three-dimensional pairing card
ActiveCN224145651Uvarious formsFlexible opening and closingOther printing matterMaster CardSoftware engineering
The utility model discloses a multi-form changeable three-dimensional pairing card, and relates to the technical field of pairing cards. The card comprises a main card body, an auxiliary card body is arranged on one side of the main card body in a foldable mode, foldable supporting folded corners are fixedly arranged on the inner side of the main card body and the inner side of the auxiliary card body in a trapezoidal mode, and foldable house-shaped folding paper is fixedly arranged on the tops of the four supporting folded corners. Two windows are symmetrically arranged on the top of the house-shaped folding paper in a folding manner, and two doors are symmetrically arranged on the top of the house-shaped folding paper below the windows in a folding manner; the drawing mechanism is arranged on the main clamping piece and the auxiliary clamping piece and used for opening the window and the door in a drawing mode. According to the utility model, through the arrangement of the window, the door and the drawing mechanism, not only are interactivity and interestingness of the dispatch enhanced, but also the cards can present more diversified forms during display, and meanwhile, a user can easily open the window and the door through the drawing mechanism, so that more surprises and fun are added to the dispatch.
Owner:CANGNAN JINFENG ARTWARE CO LTD