Color Control and White Light Generation of Upconversion Luminescence by Operating Dopant Concentrations and Pump Densities in Yb\u3csup\u3e3+\u3c/sup\u3e, Er\u3csup\u3e3+\u3c/sup\u3e, and Tm\u3csup\u3e3+\u3c/sup\u3e Tri-Doped Lu\u3csub\u3e2\u3c/sub\u3eO\u3csub\u3e3\u3c/sub\u3e Nanocrystals

We synthesized a series of Yb3+, Er3+ and Tm3+ tri-doped Lu2O3 nanocrystals with various dopant concentrations by the hydrothermal approach. Due to a unique electronic state at the top of the valence band, Lu2O3 based materials exhibit intense upconversion luminescence involving 1G4 → 3H6 of Tm3+ in blue, (2H11/2, 4S3/2) → 4I15/2 in green and 4F9/2 → 4I15/2 in red of Er3+ upon near infrared excitation at 980 nm. The variation of upconversion spectra and color points with dopant concentrations and pump densities are studied in detail on the basis of energy transfer processes. An ideal white upconversion light with color coordinates of (0.327, 0.339) is obtained by controlling the intensity of red, green, and blue emission in Lu1.906Yb0.08Er0.008Tm0.006O3nanocrystals under a pump density of 8 W cm−2. Based on the present experimental data, we may predict the dopant concentrations and pump densities for any color point within or around the white light region in the tri-doped Lu2O3 nanocrystals

Performance of C\u3csub\u3e2\u3c/sub\u3eH\u3csub\u3e4\u3c/sub\u3e Reductant in Activated-Carbon-Supported MnOx-Based SCR Catalyst at Low Temperatures

Hydrocarbons as reductants show promising results for replacing NH3 in SCR technology. Therefore, considerable interest exists for developing low-temperature (\u3c 200 °C) and environmentally friendly HC-SCR catalysts. Hence, C2H4 was examined as a reductant using activated-carbon-supported MnOx-based catalyst in low-temperature SCR operation. Its sensitivity to Mn concentration and operating temperature was parametrically studied, the results of which showed that the catalyst activity followed the order of 130 °C \u3e 150 °C \u3e 180 °C with an optimized Mn concentration near 3.0 wt.%. However, rapid deactivation of catalytic activity also occurred when using C2H4 as the reductant. The mechanism of deactivation was explored and is discussed herein in which deactivation is attributed to two factors. The manganese oxide was reduced to Mn3O4 during reaction testing, which contained relatively low activity compared to Mn2O3. Also, increased crystallinity of the reduced manganese and the formation of carbon black occurred during SCR reaction testing, and these constituents on the catalyst’s surface blocked pores and active sites from participating in catalytic activity

The Grizzly, September 11, 2014

Ursinus Remembers Bobby Fong • Student Government Changes Executive Board • Wismer Adds Food Station • UC Professors Show Work at Berman • Do You Smell That? Wismer Gets a New Composting System • Bring on the Local Food Trucks • Opinion: Is Yik Yak All That?; Argument Against Wet Campus is a Slippery One • Gridiron Gang Primed for Solid Season in 2014 • Trying Hard: Men\u27s and Women\u27s Club Rugby Squads Looking Forward to the Fall Slatehttps://digitalcommons.ursinus.edu/grizzlynews/1908/thumbnail.jp

The Grizzly, March 5, 2015

Student Senate Discusses Diversity on Campus • Sprinklers in Lower Cause Damage • Ursinus Continues to Globalize in Hong Kong • UC Relay for Life Makes Strides • Dawleys Follow Darwin • Poet Reads Her Work on Campus • Goldsmith Wins Fellowship • Opinion: Take Revenge Porn More Seriously; Marijuana Laws Should be Changed Nationwide • Rugby Teams Set to Tackle Spring • Leading Offhttps://digitalcommons.ursinus.edu/grizzlynews/1926/thumbnail.jp

The Grizzly, September 4, 2014

Zipcar Comes to Ursinus • Freshmen Placed in Main Street Houses • New Janitorial Staff at Ursinus • International Students on the Rise • Thousands Flock to Phoenixville • Discomfort of Coming Home • Access Urban Areas for Under $20 • Opinion: Ice Bucket Challenge Raises Millions, Most People Take the Easy Way Out; Lost Da Vinci Fresco • Field Hockey Looking to Repeat • Hitting the Ground Runninghttps://digitalcommons.ursinus.edu/grizzlynews/1907/thumbnail.jp

The Grizzly, October 30, 2014

Board Announces National Search for New President • Residents Relocated After Fire • Clubs Host First Ever Festifall • Yik Yak Exposes Use of Fake IDs • Midterm Elections Approaching • Halloween Compared to Other International Holidays • UC Alumni Return • Viewers are Drawn to Colonial Theatre in Phoenixville • Student Interns at Disney World • Opinion: Must Halloween Costumes for Women be Sexy?; Occupy Movement in Hong Kong Persists • Local Athlete Stong Giving Field Hockey a Scoring Spark • Diving Into 2014-15 Slate • Seri-ously Goodhttps://digitalcommons.ursinus.edu/grizzlynews/1914/thumbnail.jp

The Grizzly, November 13, 2014

Art Department Debuts New Class • Delta Pi Becomes First Gender-Neutral Fraternity in UC History • Twin Brothers Host 5 Hour Study Marathon • Midterm Election Results • Chinese Culture Should be Shared, Not Hidden • High Prices Cause Complaints • Walking Through a Day With UC EMS • Berman Museum Timeline Installed • Feminists In Action Club Tackles the Issue of Gender Inequality • Opinion: Denial of Birth Control is Unconstitutional; Jewish Frat Vandalized • Letter to the Editor • Back-to-Back Champs • Sticking Together at Ursinushttps://digitalcommons.ursinus.edu/grizzlynews/1916/thumbnail.jp

Application of tangent-arc technology for deep inspiration breath-hold radiotherapy in left-sided breast cancer

ObjectiveTo explore the advantages of dosimetry and the treatment efficiency of tangent-arc technology in deep inspiration breath-hold radiotherapy for breast cancer.MethodsForty patients with left-sided breast cancer who were treated in our hospital from May 2020 to June 2021 were randomly selected and divided into two groups. The first group’s plan was a continuous semi-arc that started at 145° ( ± 5°) and stopped at 325° ( ± 5°). The other group’s plan, defined as the tangent-arc plan, had two arcs: the first arc started at 145° ( ± 5°) and stopped at 85° ( ± 5°), and the second arc started at 25° ( ± 5°) and stopped at 325° ( ± 5°). We compared the target dose, dose in organs at risk (OARs), and treatment time between the two groups.ResultsThe target dose was similar between the continuous semiarc and tangent-arc groups. The V5 of the right lung was significantly different between the two groups (Dif 5.52, 95% confidence interval 1.92-9.13, t=3.10, P=0.004), with the patients in the continuous semi-arc and tangent-arc groups having lung V5 values of (9.16 ± 1.62)%, and (3.64 ± 0.73)%, respectively. The maximum dose to the spinal cord was (1835.88 ± 222.17) cGy in the continuous semi-arc group and (599.42 ± 153.91) cGy in the tangent-arc group, yielding a significant difference between the two groups (Dif 1236.46, 95% confidence interval 689.32-1783.6, t=4.57, P<0.001). The treatment times was (311.70 ± 60.45) s for patients in the continuous semi-arc group and (254.66 ± 40.73) s for patients in the tangent-arc group, and there was a significant difference in the mean number of treatment times between the two groups (Dif 57.04, 95% confidence interval 24.05-90.03, t=3.5, P=0.001).ConclusionBoth the continuous semi-arc and tangent-arc plans met the clinical prescription dose requirements. The OARs received less radiation with the tangent-arc plan than the continuous semi-arc plan, especially for the lung (measured as V5) and the spinal cord (measured as the maximum dose). Tangent-arc plan took significantly less time than the continuous semi-arc, which can greatly improve treatment efficiency. Therefore, tangent-arc plans are superior continuous semi-arc plans for all cases

Division of “layer exploration unit” and high-efficiency exploration in mature exploration area

Abstract: To realize high-efficiency and sustainable exploration of the Jiyang depression at the stage of high exploration degree, a hydrocarbon accumulation-geological evaluation method is developed on the basis of current geologic knowledge and extent of fine exploration. The concept of “layer exploration unit” is proposed in the study, and it is defined as an exploration geological unit that has a relatively complete and unified tectonic system, sedimentary system and hydrocarbon migration & accumulation system in a tectonic layer or tectonic sublayer within a fault basin. Then, an approach to dividing and evaluating the “layer exploration unit” is developed. With this approach, the Jiyang depression is divided into 305 layer exploration units, thus helping realize precise and stereoscopic geological understanding and exploration deployment. Fine splitting of remaining resources and benefit evaluation of exploration targets are conducted by “layer exploration units”. As a result, 66 efficient “layer exploration units” in four major areas (i.e. Paleogene upper Es4−Dongying Formation, Neogene Minghuazhen Formation−Guantao Formation, Paleozoic buried-hill, and Paleogene Kongdian Formation−lower Es4) are determined as the targets for obtaining more reserves and breakthroughs in the short and medium term. Key words: Bohai Bay Basin, Jiyang depression, fault basin, mature exploration area, layer exploration unit, fine exploration, high-efficiency exploratio

Hydrothermal fluid activity and the quantitative evaluation of its impact on carbonate reservoirs: A case study of the Lower Paleozoic in the west of Dongying sag, Bohai Bay Basin

By integrating the analyses of core samples, thin sections, homogenization temperature measurement of inclusions, stable isotopic compositions of carbon & oxygen, trace element composition, and conventional physical properties, this research identifies the evidence of Lower Paleozoic hydrothermal fluid activity in the western Dongying sag of Bohai Bay Basin, quantitatively evaluates the hydrothermal dissolution strength in various carbonate reservoirs, and analyzes the longitudinal distribution of effective fractures in reservoirs. The markers of hydrothermal dissolution in the study area include the typical hydrothermal mineral combinations such as fluorite-anhydrite-authigenic quartz combination, the homogenization temperature of inclusions in fracture fillings related to hydrothermal fluid of up to 150 °C−210 °C, and the high FeO, high SiO2, high MnO and low Na2O features of carbonate in hydrothermal fluid karst area. Dissolution of hydrothermal fluid can produce not only new fluorite mineral, but also many pores, micropores, small fractures and micro-fractures, which significantly improve the quality of carbonate reservoirs. During the process of hydrothermal fluid dissolution, calcite precipitated and filled structural fractures as the hydrothermal fluid dissolved host rock. As the hydrothermal fluid went up along faults, its velocity and temperature dropped gradually, the intensity of dissolution and calcite filling differ significantly in different formations of the Lower Paleozoic, for example, the Fengshan and Yeli-Liangjiashan Formations have low fracture filling degree and highly developed dissolved fractures and pores, whereas the Majiagou Formation has high fracture filling degree and poorly developed dissolved fractures and pores. Key words: carbonate, reservoir, hydrothermal fluid, dissolution, Bohai Bay Basin, Dongying sag, Lower Paleozoic, quantitative eveluatio