Publications

Well‐aligned nanowire arrays of Mo and its oxides have been synthesized. MoO 2 nanowire arrays are first synthesized by thermal evaporation in a vacuum chamber. With further treatments in the growth chamber, the above nanowire arrays can be turned into MoO 3 nanowire arrays or metallic Mo nanowire arrays (see Figure). The field emission properties of these nanowires are fully investigated.

1. Forest ecosystem is a basic component of terrestrial ecosystems that mitigate the impacts of climate change by absorbing significant amounts of carbon dioxide. This element is crucial in maintaining ecological equilibrium, reducing greenhouse gas emissions, and preserving biodiversity. Thus, standardised, accurate and precise methodologies for measuring forest carbon sequestration and assessing its potential are foundational in evaluating the impacts of climate change on carbon equilibrium.2. We presented Forestat, an approach for assessing forest carbon sequestration and its potential based on annual growth of biomass, considering site class and forest age conditions, wrapped in an R package, and it was applicable to all forest types. By using a comprehensive system of forest stand models, this methodology contributes to a refined comprehension of the relationships between forest biomass and carbon sequestration and offers a comprehensive evaluation of the carbon sequestration potential in forest ecosystems, unifying the methods of carbon sequestration measurement and potential calculation in natural forest and artificial forest.3. Based on the two application, we (a) introduced and demonstrated the methods in R package Forestat; (b) used the 6th, 7th, 8th, and 9th National Forest Inventory data to investigate carbon sequestration and potential productivity of degraded forests in China; and (c) conducted a suitability analysis for tree species in the Yellow River Basin.4. Forestat provides a unified, efficient, and standardized analytical tool for forest carbon sequestration and potential. We highlighted its primary forest functionalities.

Low dimensional materials have unique thermal and thermoelectric properties that can be very different from their bulk counterparts. In a previous work, we and our collaborators have developed a microdevice for measuring thermal and thermoelectric properties of multiwall carbon nanotubes. Here, we used an improved design of the device for measuring single wall carbon nanotubes, Ge nanowires, and SnO2 nanobelts. These nanostructures are trapped between two adjacent symmetric silicon nitride membranes of the micro device using either a wet deposition method or in-situ chemical vapor deposition. The measurements provide the critically needed data of the unique thermophysical properties of these nanomaterials.

Above 20 MeV the standard spheres of a Bonner sphere spectrometer (BSS) have similar responses, both in shape and sensitivity. The responses of the standard set also exhibit strongly diminishing sensitivities above 20 MeV. In the current work the Monte Carlo N-Particle eXtended (MCNPX) code was used to investigate different design modifications to increase the high-energy neutron response of a BSS. The cost-effective system expands upon the design of an existing, commercially available BSS system by adding concentric shells of copper, tungsten, and lead. These shells are used in various combinations with the existing spheres. The design, referred to as the Bonner sphere extension (BSE), incorporates both passive and active detection techniques including activation foils and the standard 6LiI(Eu) scintillator. Detailed models in MCNPX were used to create fine-group neutron responses from thermal to 1000 MeV. Measurements were performed with the BSE at Los Alamos Neutron Science Center, and the data were unfolded using the MXD-FC33 code and the calculated BSE response matrix. The resulting spectrum demonstrated the BSE system provided improvement in the measurement of the neutron spectra in the energy regions above 20 MeV when compared to the standard Bonner sphere system. The BSE system extends the sensitivity of the system to more than ten decades in energy while maintaining a nearly isotropic angular response.

Magnetic sensors are usually based on the Hall effect or a magnetoresistive sensing mechanism. Here we demonstrate that a nanogenerator can serve as a sensor for detecting the variation of the time-dependent magnetic field. The output voltage of the sensor was found to exponentially increase with increasing magnetic field. The detection sensitivities for the change and the changing rate of magnetic field are about 0.0363 ± 0.0004 ln(mV)/G and 0.0497 ± 0.0006 ln(mV)/(G/s), respectively. The response time and reset time of the sensor are about 0.13 and 0.34 s, respectively. The fabricated sensor has a detection resolution of about 3 G and can work under low frequencies (<0.4 Hz).

The application of porous hydroxyapatite–collagen (HAp-Collagen) as a bone tissue engineering scaffold is hindered by two main problems: its high cost and low initial strength. As a native 3-dimenssional collagen framework, purified porcine acellular dermal matrix (PADM) has been successfully used as a skin tissue engineering scaffold. Here we report its application as a matrix for the preparation of HAp to produce a bone tissue scaffold through a biomimetic chemical process. The HAp-PADM scaffold has two-level pore structure, with large channels (∼100 μm in diameter) inherited from the purified PADM microstructure and small pores (<100 nm in diameter) formed by self-assembled HAp on the channel surfaces. The obtained HAp-PADM scaffold (S15D) has a compressive elastic modulus as high as 600 kPa. The presence of HAp in sample S15D reduces the degradation rate of PADM in collagenase solution at 37°C. After 7 day culture of MC3T3-E1 pre-osteroblasts, MTT data show no statistically significant difference on pure PADM framework and HAp-PADM scaffold (p > 0.05). Because of its high strength and nontoxicity, its simple preparation method, and designable and tailorable properties, the HAp-PADM scaffold is expected to have great potential applications in medical treatment of bone defects.

AMA Song D, Huang C, Yang C, et al. A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer. Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. 2024. doi:10.5114/wiitm.2024.134750. APA Song, D., Huang, C., Yang, C., Shen, Y., Liu, C., & Wang, Z. et al. (2024). A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer. Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. https://doi.org/10.5114/wiitm.2024.134750 Chicago Song, Dandan, Chongjie Huang, Chen Yang, Yating Shen, Changbao Liu, Zhonglin Wang, and Limiao Lin. 2024. "A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer". Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. doi:10.5114/wiitm.2024.134750. Harvard Song, D., Huang, C., Yang, C., Shen, Y., Liu, C., Wang, Z., and Lin, L. (2024). A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer. Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. https://doi.org/10.5114/wiitm.2024.134750 MLA Song, Dandan et al. "A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer." Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne, 2024. doi:10.5114/wiitm.2024.134750. Vancouver Song D, Huang C, Yang C, Shen Y, Liu C, Wang Z et al. A comparative analysis of different reduced-port laparoscopic surgical procedures after non-curative endoscopic resection for early colorectal cancer. Videosurgery and Other Miniinvasive Techniques/Wideochirurgia i inne techniki małoinwazyjne. 2024. doi:10.5114/wiitm.2024.134750.

Abstract Ocean occupies about 71% of the global surface area and contains 97% of the total water on the earth. Ocean waves are regarded as one of the most promising renewable energy sources, but it is quite difficult to harvest such low‐quality and low‐frequency energy due to the technology limitations of traditional electromagnetic generators. In this work, a type of arc‐shaped triboelectric nanogenerator (AS‐TENG) with internal rolling structure is designed to harvest low‐frequency water wave energy. The freestanding roller with flexible surfaces can scroll freely with low friction along the arched track under external triggering, generating induced current between the complementary electrodes. The arc‐shaped design facilitates the high‐density integrating of multiple TENG units and effective packaging for potential large‐scope applications. One AS‐TENG can deliver an output power density of 5.47 W m −3 under regular triggering, while a power density of 2.34 W m −3 is achieved for an AS‐TENG array under real water wave triggering of 1.2 Hz. Moreover, through harvesting water wave energy by the AS‐TENG array, self‐powered temperature sensing and wireless transmission systems have been successfully constructed. This work demonstrates huge application prospects of the AS‐TENGs toward large‐scale ocean blue energy harvesting and environmental monitoring.

Organic piezoelectric nanogenerators (PENGs) have been attracting much attention for being lightweight and having high flexibility. Here, we present an organic PENG based on poly(vinylidene fluoride–trifluorethylene) (P(VDF–TrFE)) doped with GeSe nanosheets (NSs). Improved performances including a piezoelectric coefficient increased from 15.94 to 27.92 pC N−1, an open-circuit voltage increased by 3 times, and a high output power density of 9.76 μW cm–2 are observed when 4 wt % GeSe NSs are added, which results from the improved β-phase content of P(VDF–TrFE) and the higher piezoelectric coefficient of GeSe NSs. These improved PENGs possess high stabilities, revealing great application potentials in energy collection and sensing.