gebhart/patrepeval huggingface dataset:
Soybean Yield Preharvest Prediction Based on Bean Pods and Leaves Image Recognition Using Deep Learning Neural Network Combined With GRNN (2022)

Soybean yield is a highly complex trait determined by multiple factors such as genotype, environment, and their interactions. The earlier the prediction during the growing season the better. Accurate soybean yield prediction is important for germplasm innovation and planting environment factor improvement. But until now, soybean yield has been determined by weight measurement manually after soybean plant harvest which is time-consuming, has high cost and low precision. This paper proposed a soybean yield in-field prediction method based on bean pods and leaves image recognition using a deep learning algorithm combined with a generalized regression neural network (GRNN). A faster region-convolutional neural network (Faster R-CNN), feature pyramid network (FPN), single shot multibox detector (SSD), and You Only Look Once (YOLOv3) were employed for bean pods recognition in which recognition precision and speed were 86.2, 89.8, 80.1, 87.4%, and 13 frames per second (FPS), 7 FPS, 24 FPS, and 39 FPS, respectively. Therefore, YOLOv3 was selected considering both recognition precision and speed. For enhancing detection performance, YOLOv3 was improved by changing IoU loss function, using the anchor frame clustering algorithm, and utilizing the partial neural network structure with which recognition precision increased to 90.3%. In order to improve soybean yield prediction precision, leaves were identified and counted, moreover, pods were further classified as single, double, treble, four, and five seeds types by improved YOLOv3 because each type seed weight varies. In addition, soybean seed number prediction models of each soybean planter were built using PLSR, BP, and GRNN with the input of different type pod numbers and leaf numbers with which prediction results were 96.24, 96.97, and 97.5%, respectively. Finally, the soybean yield of each planter was obtained by accumulating the weight of all soybean pod types and the average accuracy was up to 97.43%. The results show that it is feasible to predict the soybean yield of plants <i>in situ</i> with high precision by fusing the number of leaves and different type soybean pods recognized by a deep neural network combined with GRNN which can speed up germplasm innovation and planting environmental factor optimization.
The pH‐responsive cycloterpolymers of diallyldimethylammonium chloride, 3‐(<i>N,N</i>‐diallylammonio)propanesulfonate, and sulfur dioxide (2011)

Abstract The cycloterpolymerizations of diallyldimethylammonium chloride, 3‐( N,N ‐diallylammonio)propanesulfonate, and sulfur dioxide afforded a series of pH‐responsive cycloterpolymers in excellent yields. The solution properties of these ionic polymers were controlled by the composition of the monomeric units; exhibiting dominance either in polyzwitterionic or cationic character. The unquenched valency of nitrogen in the monomeric units of the sulfobetaine zwitterions has permitted these cationic/zwitterionic polymers to be converted into a series of polyampholytes with a charge asymmetry arising out of excess of either the cationic or anionic centers. The water‐solubility of these polymers, upon low‐ and high‐salt (NaCl) additions has been investigated to provide critical solution concentrations to promote water‐insolubility and ‐solubility. A series of associating polymers of the above two monomers and SO 2 with a hydrophobic incorporation of 3–7 mol % of diallyloctadecylammonium chloride has also been synthesized. The solubility and viscosity of the hydrophobically modified polymers in the polyampholytic form were increased considerably in the presence of anionic surfactant sodium dodecyl sulfate. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
ChemInform Abstract: STUDIES ON THE MECHANISM OF OLEFIN METATHESIS. IV. EXCHANGES OF HYDRIDE AND CARBENES (1980)

Abstract Bei Olefin‐Metathese‐Reaktionen wird ein Wasserstoff‐Austausch zwischen Katalysator und Substrat nur bei hohen Katalysator‐Konzentrationen beobachtet.
An experimental kinestatic comparison between continuum manipulators with structural variations (2014)

Continuum manipulators attract a lot of interests due to their advantageous properties, such as distal dexterity, design compactness, intrinsic compliance for safe interaction with unstructured environments. However, these manipulators sometimes suffer from the lack of enough stiffness while applied in surgical robotic systems. This paper presents an experimental kinestatic comparison between three continuum manipulators, aiming at revealing how structural variations could alter the manipulators' stiffness properties. These variations not only include modifying the arrangements of elastic components, but also include integrating a passive rigid kinematic chain to form a hybrid continuum-rigid manipulator. Results of this paper could contribute to the development of design guidelines for realizing desired stiffness properties of a continuum or hybrid manipulator.
ChemInform Abstract: Approaches to the Total Synthesis of Biologically Active Natural Products: Studies Directed Towards Bryostatins (2011)

Abstract Review: 45 refs.
Brachiation: conceptual history (2018)

The agent‐noun “brachiator” was first employed by Richard Owen in 1859 to distinguish gibbons from knuckle‐walking great apes. Subsequent application of the term and its derivatives expanded to include a variety of monkeys and theoretical human ancestors. Observations on forest‐dwelling gibbons and a host of other primates indicate that the forelimb suspensory locomotion of gibbons is unique, and the morphological features that functional morphologists thought were primarily related to arm‐swinging locomotion more commonly facilitate vertical climbing and versatile foraging among flexible branches. Current fossil evidence does not strongly support theories of hominid evolution that include major stages of brachiation ( sensu stricto ) and knuckle‐walking.
Experimental Characterization, Optimization, and Recovery of Data Retention Errors in MLC NAND Flash Memory (2018)

This paper summarizes our work on experimentally characterizing, mitigating, and recovering data retention errors in multi-level cell (MLC) NAND flash memory, which was published in HPCA 2015, and examines the work's significance and future potential. Retention errors, caused by charge leakage over time, are the dominant source of flash memory errors. Understanding, characterizing, and reducing retention errors can significantly improve NAND flash memory reliability and endurance. In this work, we first characterize, with real 2Y-nm MLC NAND flash chips, how the threshold voltage distribution of flash memory changes with different retention ages -- the length of time since a flash cell was programmed. We observe from our characterization results that 1) the optimal read reference voltage of a flash cell, using which the data can be read with the lowest raw bit error rate (RBER), systematically changes with its retention age, and 2) different regions of flash memory can have different retention ages, and hence different optimal read reference voltages. Based on our findings, we propose two new techniques. First, Retention Optimized Reading (ROR) adaptively learns and applies the optimal read reference voltage for each flash memory block online. The key idea of ROR is to periodically learn a tight upper bound of the optimal read reference voltage, and from there approach the optimal read reference voltage. Our evaluations show that ROR can extend flash memory lifetime by 64% and reduce average error correction latency by 10.1%. Second, Retention Failure Recovery (RFR) recovers data with uncorrectable errors offline by identifying and probabilistically correcting flash cells with retention errors. Our evaluation shows that RFR essentially doubles the error correction capability.
Application of bacterial and yeast biosurfactants for enhanced removal and biodegradation of motor oil from contaminated sand (2015)

This study investigated the potential application of two biosurfactants for enhanced removal capability and biodegradation of motor oil contaminated sand under laboratory conditions. The biosurfactants were produced by the yeast Candida sphaerica and by the bacterium Bacillus sp. cultivated in low-cost substrates. The ability of removing motor oil from soil by the two biosurfactants was identified and compared with that of the synthetic surfactants Tween 80 and Triton X-100. Both crude and isolated biosurfactants showed excellent effectiveness on motor oil removal from contaminated sand under kinetic conditions (70–90%), while the synthetic surfactants removed between 55 and 80% of the oil. A contact time of 5–10 min under agitation seemed to be enough for oil removal with the biosurfactants and synthetic surfactants tested. The crude and the isolated biosurfactant from C. sphaerica were able to remove high percentages of motor oil from packed columns (around 90%) when compared to the biosurfactant from Bacillus sp. (40%). For the degradation experiments conducted in motor oil contaminated sand enriched with sugar cane molasses, however, oil degradation reached almost 100% after 90 d in the presence of Bacillus sp. cells, while the percentage of oil degradation did not exceed 50% in the presence of C. sphaerica. The presence of the biosurfactants increased the degradation rate in 10–20%, especially during the first 45 d, indicating that biosurfactants acted as efficient enhancers for hydrocarbon biodegradation. The results indicated the biosurfactants enhancing capability on both removal and rate of motor oil biodegradation in soil systems.
Chemistry of Carbon Nanotubes (2006)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Survivin dynamics increases at centromeres during G2/M phase transition and is regulated by microtubule-attachment and Aurora B kinase activity (2004)

The inhibitor of apoptosis protein survivin is implicated in two key biological events: in the control of cell proliferation and in the regulation of cell lifespan. Although the details of mitotic roles of survivin are unclear, the protein appears to modulate microtubule function and might participate in regulating the spindle checkpoint. Survivin physically associates with Aurora B, a serine-threonine kinase involved in microtubule attachment to centromeres and regulation of chromosome segregation. Here we have examined the dynamics and localization of a survivin-GFP chimera using high-resolution fluorescence microscopy and photobleaching. Survivin forms a bi-partite structure at the inner centromere that undergoes significant stretching during mitosis. Photobleaching experiments revealed marked changes in rates of survivin turnover at centromeres. These were regulated by stage of the cell cycle, microtubule attachment, and Aurora B kinase activity. We hypothesize that changes in the turnover of survivin at centromeres influence the stability of kinetochore-microtubule attachment and signaling of the spindle checkpoint.
A motion and shape-based pedestrian detection algorithm (2004)

In this paper we investigate a vision-based pedestrian detection algorithm which can be used in the design of intelligent vehicle systems. The input to the algorithm is video data obtained from a camera mounted on the vehicle. In the proposed method, a wavelet transform is computed on the video frames, and multistage template matching is used to determine whether or not a pedestrian is present in the frame. Motion detection and localization is used to reduce the computational requirements. Experimental results are presented for several different video sequences. The results show that this method is able to reliably detect pedestrians in cluttered scenes.
Efficacy of vasodilator therapy in canine model of acute pulmonary hypertension (1988)

This study was performed to determine 1) the effects of acute pulmonary embolization (induced by injection of autologous muscle) on right ventricular (RV) performance, coronary hemodynamics, and gas exchange; and 2) the efficacy of subsequent administration of nitroglycerin, prostaglandin E1, and hydralazine with regard to improvement in RV function and gas exchange in eight open-chest dogs. After embolization, pulmonary artery (PA) pressure and vascular resistance (PVR) increased three- to fivefold without changes in RV end-diastolic dimensions (ultrasonic dimension technique) or pressure. However, systolic dimensions increased, and stroke volume (SV) fell. Gas exchange, lung compliance, and pH worsened. Subsequent administration of nitroglycerin (5 micrograms.kg-1.min-1) and prostaglandin E1 (0.2 micrograms.kg-1.min-1) caused further decreases in SV and pH. In contrast, hydralazine (mean 0.15 mg/kg) improved myocardial segment shortening, SV, PVR, pulmonary artery flow, and gas exchange. Coronary blood flow increased by 110%. Thus in this canine model of combined pulmonary hypertension and respiratory insufficiency, nitroglycerin and prostaglandin E1 exerted no beneficial cardiopulmonary effects. In contrast, hydralazine improved regional and global RV performance and gas exchange.
Estimation and cancellation of interferences in automotive radar signals (2017)

Radar sensors become typical components for automotive driver assistance systems and autonomous driving. The widespread use of this sensor type leads to an increasing risk of unwanted interferences. Those interferences can severely degrade the detection performance and cause sensor blindness. To overcome this problem, this paper describes a method to estimate and remove interfering signals in data of chirp sequence modulated radars. The estimation is derived theoretically and applied on simulation and measurement data.
Low levels of ventricular CSF orexin/hypocretin in advanced PD (2003)

The origins of excessive daytime sleepiness in Parkinson disease (PD) are unclear. The authors hypothesize that orexin neurons, a recently identified wake promoting system, could contribute to its pathophysiology. They measured orexin-A/hypocretin-1 concentration in ventricular CSF in 19 parkinsonian patients and compared it with neurologic controls. Orexin levels were lower in patients and decreased with the severity of the disease. The authors suggest that orexin neurons contribute to daytime sleepiness in late stage PD.
Fabrication of micro-optical components by using a femtosecond laser (2004)

Femtosecond laser has been widely used in materials micro-processing when high accuracy and small structure size are required. When a transparent material like glass is irradiated by a tightly focused femtosecond laser, the photoinduced reaction is expected to occur only near the focused part of the laser beam due to the multiphoton processes. We observed various induced structures e.g. color center defects, refractive index change, micro-void and micro-crack, in glasses after the femtosecond laser irradiation. Here, we demonstrate the fabrication of various micro-optical components, e.g. optical waveguide, microgating, microlens, fiber attenuator, 3-dimensional optical memory by using the femtosecond laser-induced structures. The femtosecond laser direct writing technique is very promising in the fabrication of micro-optical components with various optical functions.
Seasonal variation of the lipoidal matters and hypolipidaemic activity of the red alga<i> Corallina officinalis</i> L. (2003)

The lipoidal matters of Corallina officinalis L. showed a seasonal nonsignificant quantitative variation. However, the fatty acids revealed a relative increase in the summer and winter, while unsaponifiable matter exhibited a slight increase in the spring. The GC/MS analysis of saponifiable and unsaponifiable matter of the algal samples collected in different seasons revealed that samples collected in the spring contained a low cholesterol content and high steroidal compounds as well as high polyunsaturated fatty acids. The alcohol extract, hexane extract and fatty acid fraction of this algal sample exhibited a significant hypolipidaemic activity. Also, two biologically active fractions of hydrocarbons were isolated by CC technique from the hexane fraction of C. officinalis L. and identified by GC/MS.
Multiple beam broadband beamforming: filter design and real-time implementation (2002)

In this paper the design and implementation of a truly broadband beamformer is described. Using only a limited number of microphones a beamformer has been developed with a reasonably homogeneous beampattern over the entire speech bandwidth. The solution is obtained as the result of a filter-and-sum operation. Beams are steered towards different listening-directions and for each direction a set of spatio-temporal filters had to be designed. All beams operate in parallel and a beam-selection procedure picks out the beam with the most prominent speech signal. The complete system has been implemented in real-time using 1 MOTOROLA-56001 and 4 TMS-320C40 processors.
Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications (2022)

Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past decade, tremendous efforts have been made to develop various active materials and incorporate them into functional devices for practical applications, pushing the research of tunable metasurfaces to the forefront of nanophotonics. Those active materials include phase change materials (PCMs), semiconductors, transparent conducting oxides (TCOs), ferroelectrics, liquid crystals (LCs), atomically thin material, <i>etc.</i>, and enable intriguing performances such as fast switching speed, large modulation depth, ultracompactness, and significant contrast of optical properties under external stimuli. Integration of such materials offers substantial tunability to the conventional passive nanophotonic platforms. Tunable metasurfaces with multifunctionalities triggered by various external stimuli bring in rich degrees of freedom in terms of material choices and device designs to dynamically manipulate and control EM waves on demand. This field has recently flourished with the burgeoning development of physics and design methodologies, particularly those assisted by the emerging machine learning (ML) algorithms. This review outlines recent advances in tunable metasurfaces in terms of the active materials and tuning mechanisms, design methodologies, and practical applications. We conclude this review paper by providing future perspectives in this vibrant and fast-growing research field.
The Environmental Genome Project: phase I and beyond. (2004)

Human illness is caused by many interrelated factors including aging, inherited genetic predispositions, and a variety of environmental exposures. There is increasing awareness of the role of genetics as a factor that can dramatically alter susceptibility to all disease, especially environmentally induced chronic disease, such as cancer, asthma, diabetes, cardiovascular disease, and neurodegenerative disorders. In some cases, a genetic factor influences disease susceptibility in a small fraction of the population because it occurs at a low frequency or involves a relatively low-incidence disease; however, in other cases, a genetic factor increases susceptibility in a large number of individuals and involves a disease that occurs at high incidence, creating a large public health burden.
Semiconductor optical amplifiers at 2.0‐µm wavelength on silicon (2017)

Abstract A semiconductor optical amplifier at 2.0‐µm wavelength is reported. This device is heterogeneously integrated by directly bonding an InP‐based active region to a silicon substrate. It is therefore compatible with low‐cost and high‐volume fabrication infrastructures, and can be efficiently coupled to other active and passive devices in a photonic integrated circuit. On‐chip gain larger than 13 dB is demonstrated at 20 °C, with a 3‐dB bandwidth of ∼75 nm centered at 2.01 µm. No saturation of the gain is observed for an on‐chip input power up to 0 dBm, and on‐chip gain is observed for temperatures up to at least 50 °C. This technology paves the way to chip‐level applications for optical communication, industrial or medical monitoring, and non‐linear optics. image
Multiwell Plate Impedance Analysis of a Nanowell Array Sensor for Label-Free Detection of Cytokines in Mouse Serum (2020)

We present a novel method for label-free detection of tumor necrosis factor alpha (TNF-α) in serum after immobilization by electric field. Detection of proteins in blood using label-free impedance-based techniques is difficult due to high salt concentration of the matrix, which results in charge screening. The nanowell array sensor provides enhanced electrochemical sensitivity by electric field focusing in the nanoscale volume wells. Here, an on-chip multiwell plate sensing platform was fabricated and tested. The sensor performance through testing in mouse serum at protein concentrations between 10 and 500 ng/l has been demonstrated. This detection modality is advantageous to many label-free electronic sensors in that signal power scales will increase in salt concentration, thus improving the sensitivity of the platform.
Integrity of vein grafts as a function of initial intimal and medial preservation. (1983)

An "optimal" technique of vein graft preparation with papaverine and tissue culture was compared with an "injury" technique with 37 degrees C saline storage for 1 hr. Paired interposition cephalic vein grafts were placed in the femoral arteries of dogs. Specimens were taken at the time of implantation, at 3 and 24 hr, and at 7 and 30 days for light, scanning, and transmission electron microscopy. Veins obtained by the injury method showed extensive initial disruption of the endothelium and platelet and white cell adhesion at 3 and 24 hr. At 7 days the endothelium was restored, but there was marked inflammation and neovascularization of the media. At 30 days this had resolved; however, the smooth muscle cells appeared modulated (increase in relative numbers of metabolic organelles with contractile apparatus disassembly). Extracellular matrix was substantially increased, with abundant amorphous ground substance. In contrast, veins obtained by the optimal method had intact endothelium both at implantation and thereafter. Adhesion of white cells and platelets to the endothelium did not occur. The media remained compact without inflammation and without modulation of the smooth muscle cells. We conclude that vein grafts prepared by the optimal technique do not develop early or late evidence of endothelial or medial injury. This should result in a nonthrombogenic graft immediately after surgery and diminished late intimal/medial hyperplasia.