传统的沉积物孔隙水磷酸盐含量测定方法通常是采用离心法获取沉积物柱芯孔隙水,然后再进行磷酸盐含量测定。这种常规测定方法不仅破坏了沉积物的原本物理化学结构,而且分样间距多为厘米级,无法满足沉积物-水界面磷酸盐的高分辨率分布特...传统的沉积物孔隙水磷酸盐含量测定方法通常是采用离心法获取沉积物柱芯孔隙水,然后再进行磷酸盐含量测定。这种常规测定方法不仅破坏了沉积物的原本物理化学结构,而且分样间距多为厘米级,无法满足沉积物-水界面磷酸盐的高分辨率分布特征研究和释放通量的高精度估算要求。为克服传统监测技术破坏系统原始状态和分辨率低的弊端,近年来沉积物孔隙水磷酸盐原位监测技术迅猛发展,较为成熟的有透析装置技术(Dialysis peepers)、薄膜扩散平衡技术(Diffusive equilibrium in thin-films technique,DET)和薄膜扩散梯度技术(Diffusive gradients in thin-films technique,DGT)等。本文综述了透析装置技术、薄膜扩散平衡技术和薄膜扩散梯度技术的基本原理和应用实例,对比分析了他们各自的优缺点和发展应用前景。DGT作为一种新型、廉价的原位被动采样技术,具有原位和高分辨率监测的优点,被广泛应用于水体、沉积物和土壤等研究,在获取沉积物孔隙水磷酸盐含量及时空分布特征等方面优势突出。如何延长DGT胶体的使用寿命、提高监测的空间分辨率和实现多元素同步监测是其主要发展方向。大量研究表明,沉积物内源磷释放与沉积物中Fe-S的耦合循环存在密切联系,深入了解湖泊沉积物P-Fe-S的耦合生物地球化学循环过程是揭示湖泊内源磷释放机制的一把钥匙。快速发展的薄膜扩散梯度(DGT)技术及其与DET技术联用无疑为P-Fe-S耦合循环研究提供了有效手段,亟待在不同类型湖泊中应用和完善,为深刻揭示P-Fe-S耦合循环过程与机制提供独特信息。展开更多
Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits ...Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits with smaller feature size,higher operating frequency,and lower power consumption than CMOS have been presented.However,QCA is limited in its sequential circuit design with high performance flip-flops.Based on a brief introduction of QCA and dual-edge triggered (DET) flip-flop,we propose two original QCA-based D and JK DET flip-flops,offering the same data throughput of corresponding single-edge triggered (SET) flip-flops at half the clock pulse frequency.The logic functionality of the two proposed flip-flops is verified with the QCADesigner tool.All the proposed QCA-based DET flip-flops show higher performance than their SET counterparts in terms of data throughput.Furthermore,compared with a previous DET D flip-flop,the number of cells,covered area,and time delay of the proposed DET D flip-flop are reduced by 20.5%,23.5%,and 25%,respectively.By using a lower clock pulse frequency,the proposed DET flip-flops are promising for constructing QCA sequential circuits and systems with high performance.展开更多
Detecting exogenous gene copy numbers is crucial for examining genetically modified organisms. Traditional methods face a trade-off between feasibility and cost, highlighting the need for a high-precision and low-cost...Detecting exogenous gene copy numbers is crucial for examining genetically modified organisms. Traditional methods face a trade-off between feasibility and cost, highlighting the need for a high-precision and low-cost alternative. In this study, we introduced the RISE method, which is based on Rare Allele Infusion and Sanger Sequencing Estimation, for rice.展开更多
For the Monge-Amp`ere equation det D2u = 1, the authors find new auxiliary curvature functions which attain their respective maxima on the boundary. Moreover, the upper bounded estimates for the Gauss curvature and th...For the Monge-Amp`ere equation det D2u = 1, the authors find new auxiliary curvature functions which attain their respective maxima on the boundary. Moreover, the upper bounded estimates for the Gauss curvature and the mean curvature of the level sets for the solution to this equation are obtained.展开更多
Let A be a d x d real expansive matrix. An A-dilation Parseval frame wavelet is a function φ E n2 （Rd）, such that the set {｜det A｜n/2φ（Ant -l） ：n ∈ Z, l∈ Zd} forms a Parseval frame for L2 （Rd）. A measurab...Let A be a d x d real expansive matrix. An A-dilation Parseval frame wavelet is a function φ E n2 （Rd）, such that the set {｜det A｜n/2φ（Ant -l） ：n ∈ Z, l∈ Zd} forms a Parseval frame for L2 （Rd）. A measurable function f is called an A-dilation Parseval frame wavelet multiplier if the inverse Fourier transform of fφ is an A-dilation Parseval frame wavelet whenever φ is an A-dilation Parseval frame wavelet, where φ denotes the Fourier transform of φ. In this paper, the authors completely characterize all A-dilation Parseval frame wavelet multipliers for any integral expansive matrix A with ｜ det（A）｜= 2. As an application, the path-connectivity of the set of all A-dilation Parseval frame wavelets with a frame MRA in L2（Rd） is discussed.展开更多
Notwithstanding the most noteworthy verifiable live birth achievement rates for couples experiencing in vitro fertilization (IVF), there has been a scourge of iatrogenic twin and higher gestation development considere...Notwithstanding the most noteworthy verifiable live birth achievement rates for couples experiencing in vitro fertilization (IVF), there has been a scourge of iatrogenic twin and higher gestation development considered from this treatment. While some expanded peril is natural for the barren populace requiring treatment, the act of multiple embryo transfer adds to these inconveniences and results, particularly concerning its part in higher number pregnancies. Improvement in cryopreservation procedures has permitted conservation of supernumerary embryos for use in future cycles, and refinements in culture frameworks and embryo selection have brought about the transfer of elective single embryos while keeping up positive pregnancy rates. The willful exchange of a single top notch quality elective single embryo transfer e-SET (Blastocyst) has fundamentally lessened the multiple gestation rates and boosted the rate of singleton pregnancy without compromising the global success rates. We acknowledge that in high-risk situations (e.g. previous history of preterm gestation and poor maternal wellbeing), double-embryo transfer (DET) or triple embryo transfer (TET) ought to be disallowed because of unsuitably high perils. Be that as it may, we contend that ordering e-SET for every single young lady can be viewed as an unsatisfactory break of patient self-governance, particularly since DET/TET offers certain ladies money related and social focal points.展开更多
At 2 a.m.on March 29,2023(Beijing Time),the Institute of High Energy Physics(IHEP)of the Chinese Academy of Sciences(CAS),together with some 40 research institutions worldwide,released their latest discoveries on the ...At 2 a.m.on March 29,2023(Beijing Time),the Institute of High Energy Physics(IHEP)of the Chinese Academy of Sciences(CAS),together with some 40 research institutions worldwide,released their latest discoveries on the brightest Gamma-Ray Burst(dubbed as GRB 221009A)ever detected by humanity.With the unique observations made by two Chinese space telescopes,namely Insight-HXMT and GECAM-C,scientists were able to accurately measure how bright and how much energy was released by this burst,which is the key to understanding this historical event.展开更多
文摘传统的沉积物孔隙水磷酸盐含量测定方法通常是采用离心法获取沉积物柱芯孔隙水,然后再进行磷酸盐含量测定。这种常规测定方法不仅破坏了沉积物的原本物理化学结构,而且分样间距多为厘米级,无法满足沉积物-水界面磷酸盐的高分辨率分布特征研究和释放通量的高精度估算要求。为克服传统监测技术破坏系统原始状态和分辨率低的弊端,近年来沉积物孔隙水磷酸盐原位监测技术迅猛发展,较为成熟的有透析装置技术(Dialysis peepers)、薄膜扩散平衡技术(Diffusive equilibrium in thin-films technique,DET)和薄膜扩散梯度技术(Diffusive gradients in thin-films technique,DGT)等。本文综述了透析装置技术、薄膜扩散平衡技术和薄膜扩散梯度技术的基本原理和应用实例,对比分析了他们各自的优缺点和发展应用前景。DGT作为一种新型、廉价的原位被动采样技术,具有原位和高分辨率监测的优点,被广泛应用于水体、沉积物和土壤等研究,在获取沉积物孔隙水磷酸盐含量及时空分布特征等方面优势突出。如何延长DGT胶体的使用寿命、提高监测的空间分辨率和实现多元素同步监测是其主要发展方向。大量研究表明,沉积物内源磷释放与沉积物中Fe-S的耦合循环存在密切联系,深入了解湖泊沉积物P-Fe-S的耦合生物地球化学循环过程是揭示湖泊内源磷释放机制的一把钥匙。快速发展的薄膜扩散梯度(DGT)技术及其与DET技术联用无疑为P-Fe-S耦合循环研究提供了有效手段,亟待在不同类型湖泊中应用和完善,为深刻揭示P-Fe-S耦合循环过程与机制提供独特信息。
基金Project (No.Y1110808) supported by the Natural Science Foundation of Zhejiang Province,China
文摘Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits with smaller feature size,higher operating frequency,and lower power consumption than CMOS have been presented.However,QCA is limited in its sequential circuit design with high performance flip-flops.Based on a brief introduction of QCA and dual-edge triggered (DET) flip-flop,we propose two original QCA-based D and JK DET flip-flops,offering the same data throughput of corresponding single-edge triggered (SET) flip-flops at half the clock pulse frequency.The logic functionality of the two proposed flip-flops is verified with the QCADesigner tool.All the proposed QCA-based DET flip-flops show higher performance than their SET counterparts in terms of data throughput.Furthermore,compared with a previous DET D flip-flop,the number of cells,covered area,and time delay of the proposed DET D flip-flop are reduced by 20.5%,23.5%,and 25%,respectively.By using a lower clock pulse frequency,the proposed DET flip-flops are promising for constructing QCA sequential circuits and systems with high performance.
基金supported by the Natural Science Foundation of Hunan Province for Distinguished Young Scholars, China (Grant No.2021JJ10041)the Biological Breeding-National Science and Technology Major Project, China (Grant No.2023ZD04072)the Hainan Yazhou Bay Seed Laboratory and National Seed Group, China (Grant Nos.B23CQ15HP and B23YQ1517)。
文摘Detecting exogenous gene copy numbers is crucial for examining genetically modified organisms. Traditional methods face a trade-off between feasibility and cost, highlighting the need for a high-precision and low-cost alternative. In this study, we introduced the RISE method, which is based on Rare Allele Infusion and Sanger Sequencing Estimation, for rice.
基金supported by the Chinese Universities Scientific Fund(No.WK0010000028)supported by the National Science Fund for Distinguished Young Scholars of China and Wu Wen-Tsun Key Laboratory of Mathematics+1 种基金partially supported by the National Natural Science Foundation of China(Nos.11101110,11326144)the Foundation of Harbin Normal University(No.KGB201224)
文摘For the Monge-Amp`ere equation det D2u = 1, the authors find new auxiliary curvature functions which attain their respective maxima on the boundary. Moreover, the upper bounded estimates for the Gauss curvature and the mean curvature of the level sets for the solution to this equation are obtained.
基金Project Supported by the National Natural Science Foundation of China(Nos.11071065,11101142,11171306,10671062)the China Postdoctoral Science Foundation(No.20100480942)+1 种基金the Doctoral Program Foundation of the Ministry of Education of China(No.20094306110004) the Program for Science and Technology Research Team in Higher Educational Institutions of Hunan Province
文摘Let A be a d x d real expansive matrix. An A-dilation Parseval frame wavelet is a function φ E n2 （Rd）, such that the set {｜det A｜n/2φ（Ant -l） ：n ∈ Z, l∈ Zd} forms a Parseval frame for L2 （Rd）. A measurable function f is called an A-dilation Parseval frame wavelet multiplier if the inverse Fourier transform of fφ is an A-dilation Parseval frame wavelet whenever φ is an A-dilation Parseval frame wavelet, where φ denotes the Fourier transform of φ. In this paper, the authors completely characterize all A-dilation Parseval frame wavelet multipliers for any integral expansive matrix A with ｜ det（A）｜= 2. As an application, the path-connectivity of the set of all A-dilation Parseval frame wavelets with a frame MRA in L2（Rd） is discussed.
文摘Notwithstanding the most noteworthy verifiable live birth achievement rates for couples experiencing in vitro fertilization (IVF), there has been a scourge of iatrogenic twin and higher gestation development considered from this treatment. While some expanded peril is natural for the barren populace requiring treatment, the act of multiple embryo transfer adds to these inconveniences and results, particularly concerning its part in higher number pregnancies. Improvement in cryopreservation procedures has permitted conservation of supernumerary embryos for use in future cycles, and refinements in culture frameworks and embryo selection have brought about the transfer of elective single embryos while keeping up positive pregnancy rates. The willful exchange of a single top notch quality elective single embryo transfer e-SET (Blastocyst) has fundamentally lessened the multiple gestation rates and boosted the rate of singleton pregnancy without compromising the global success rates. We acknowledge that in high-risk situations (e.g. previous history of preterm gestation and poor maternal wellbeing), double-embryo transfer (DET) or triple embryo transfer (TET) ought to be disallowed because of unsuitably high perils. Be that as it may, we contend that ordering e-SET for every single young lady can be viewed as an unsatisfactory break of patient self-governance, particularly since DET/TET offers certain ladies money related and social focal points.
文摘At 2 a.m.on March 29,2023(Beijing Time),the Institute of High Energy Physics(IHEP)of the Chinese Academy of Sciences(CAS),together with some 40 research institutions worldwide,released their latest discoveries on the brightest Gamma-Ray Burst(dubbed as GRB 221009A)ever detected by humanity.With the unique observations made by two Chinese space telescopes,namely Insight-HXMT and GECAM-C,scientists were able to accurately measure how bright and how much energy was released by this burst,which is the key to understanding this historical event.
