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Symposium MB5—Size Effects and Small-Scale Mechanical Behavior of Materials
nanocomposites nanocrystalline materials
2016/7/18
Deformation and failure mechanisms in materials become size-dependent when sample dimensions and/or microstructures approach the sub-micrometer regime. Size effects include the increase in strength of...
Sizing the Horizon: The Effects of Chart Size and Layering on the Graphical Perception of Time Series Visualizations
Visualization graphical perception time series line charts, horizon graphs
2016/5/24
We investigate techniques for visualizing time series data
and evaluate their effect in value comparison tasks. We
compare line charts with horizon graphs—a space-efficient
time series visualizatio...
A foldable material that can change size,volume and shape
foldable material change size volume shape
2016/3/11
Imagine a house that could fit in a backpack or a wall that could become a window with the flick of a switch.Harvard researchers have designed a new type of foldable material that is versatile, tunabl...
Laser Footprint Size and Pointing Precision Analysis for LIDAR Systems
LiDAR Data Accuracy Analysis Laser scanning
2015/11/20
Laser footprint size and beam divergence angle tuning was found to affect LiDAR data accuracy and measurement precision because of beam axis shifting. The laser beam divergence angle is generally tuna...
HARVARD MICROROBOTICS LAB DEVELOPS FIRST INSECT-SIZE ROBOT CAPABLE OF FLYING AND SWIMMING
HARVARD MICROROBOTICS LAB INSECT-SIZE ROBOT CAPABLE FLYING SWIMMING
2015/10/21
In 1939, a Russian engineer proposed a “flying submarine” -- a vehicle that can seamlessly transition from air to water and back again. While it may sound like something out of a James Bond film, engi...
Self-thinning and community persistence in a simple size-structured dynamical model of plant growth
Allometricrelationships Basalstemdiameter Dynamicalmodels Persistenceconditions Plantsize Self-thinning Sizedensitydistribution Sizestructure
2015/8/27
Thispaperpresentsasize-structureddynamicalmodelofplantgrowth.Themodel takes the form of a partial differential-integral equation and includes the effects of self-shading by leaves. Closed form solutio...
How Small Should Pixel Size Be?
Signal-to-Noise Ratio(SNR) Dynamic Range(DR) Modulation Transfer Function(MTF)
2015/8/17
Pixel design is a key part of image sensor design. After deciding on pixel architecture, a fundamental tradeoff is made to select pixel size. A small pixel size is desirable because it results in a sm...
Optimal Throughput-Delay Scaling in Wireless Networks–Part II:Constant-Size Packets
Throughput-Delay Scaling Wireless Networks Constant-Size Packets
2015/8/12
In Part I we characterized the optimal throughput-delay trade-off in static wireless networks as D(n) = Θ(nT(n)), where D(n) and T(n) are the average packet delay and throughput in a network of n node...
Hierarchical Identity Based Encryption with Constant Size Ciphertext
Constant Size Ciphertext Based Encryption
2015/8/5
We present a Hierarchical Identity Based Encryption (HIBE) system where the ciphertext consists of just three group elements and decryption requires only two bilinear map computations, independent of ...
A traitor tracing system enables a publisher to trace a pirate decryption box to one of the secret keys used to create the box. We present the first traitor tracing system where ciphertext size is "co...
Laid-Back, Touchless Collaboration around Wall-size Displays: Visual Feedback and Affordances
Touchless Gestures Visual Feedback Collaboration Wall-size Displays
2014/12/20
To facilitate interaction and collaboration around ultra-high-resolution, Wall-Size Displays (WSD), post-WIMP interaction modes like touchless and multi-touch have opened up new, unprecedented opportu...
Controlling the Flow of Microscopic Particles—The Role of Beam Size
Optical Manipulation Optical Tweezers Directional Flow
2012/12/28
Flow of micro particles and fluids is important in many microscopic systems. Here we present details of our finding of a directional flow of micro particles due to a single beam optical trap. It was f...
APPROXIMATION OF VOLUME AND BRANCH SIZE DISTRIBUTION OF TREES FROM LASER SCANNER DATA
LIDAR point cloud trees classification size approximation carbon cycle
2012/9/3
This paper presents an approach for automatically approximating the above-ground volume and branch size distribution of trees from dense terrestrial laser scanner produced point clouds. The approach i...
Size distributions of chemically synthesized Ag nanocrystals
Size distributions chemically synthesized Ag nanocrystals
2012/2/21
Silver nanocrystals made by a chemical reduction of silver salts (AgNO$_3$) by sodium borohydride (NaBH$_4$) were studied using Transmission Electron Microscopy (TEM) and light scattering simulations....
Dual-use of compact HF radars for the detection of mid- and large-size vessels
HF radar object detection networks ocean currents remote sensing
2010/5/31
This paper describes the development of the SeaSonde High Frequency Radar system into a dual-use application for the mapping of ocean surface currents and detection of ships at sea. This development e...