多层前馈网络在图象分割中的应用

本文提出用多层前馈网络进行基于边缘信息的图象分割,讨论了学习样本的提取步骤和网络学习的速度改进方法。实验表明,用多层前馈网络进行图象分割能获得良好的结果。     

A new method for optimal deconvolution

Using an innovation analysis method in the time domain, the problem of optimal input estimation is considered, Two algorithms for calculating optimal deconvolution estimators are presented. A new tool for obtaining the estimators is described. It is based on the projection method and innovation theory. The approach covers input prediction, filtering, and smoothing problems. The solution is also applied to unstable linear systems, disturbances, or input models     

吉尔吉斯马平528井钻井液技术

马平528井地层沉积为陆相古河道沉积，沉积岩以碎屑岩和泥岩为主，地层组成及岩性较为复杂，尤其是在该地层进行水平井施工，对钻井液体系及其各项性能参数提出了比常规水平井更高的要求。根据地层易坍塌、可钻性差、钻时慢、起下钻频繁、井眼浸泡时间长等特点，该井采用了强抑制性聚合醇润滑防塌钻井液体系，现场通过合理调整钻井液密度及其它性能参数，满足了水平井段的钻井施工要求。     

Emancipating Target‐Functionalized Carbon Dots from Autophagy Vesicles for a Novel Visualized Tumor Therapy

Killing the tumor cells by a visualized targeting system is a promising strategy with which to achieve high efficiency, low side effects, and a high survival rate for tumor therapy. Here, an autophagy regulation strategy is reported by emancipating target‐functionalized carbon dots from autophagy vesicles for the efficient visualized tumor therapy. The folic acid modified N‐doped carbon dots (FN‐CDs) are selectively endocytosed (specific cellular uptake rate >93.40%) and stably existed in autophagic vacuoles in tumor cells. Next, the autophagic vacuoles are “opened” by the autophagy inhibitors. Released FN‐CDs activate both the intrinsic and extrinsic apoptotic signaling pathway and kill tumor cells efficiently. This method achieves therapeutic effects with high performance in 26 types of tumor cell lines. Animal experiments show that the 30 d survival rate of this therapeutic strategy is much higher than that with traditional drug treatment. Real‐time imaging/monitoring and its effects on the intelligent tumor therapy are also demonstrated based on the stable, strong, green emission from FN‐CDs.     

A Unified Framework for Transmitter Power Control in Cellular Radio Systems

In earlier works on transmitter power control in cellular radio systems, the problem of whether a signal‐to‐interference ratio (SIR) threshold is achievable is determined by apparently different rules for homogeneous and heterogeneous SIR systems. In this paper, we present a unified and more universal framework for both cases. We also highlight the conditions under which a given SIR threshold vector for the heterogeneous SIR system is achievable, although so far there is no general solution to this problem.     

An Analog Front‐End Circuit for ISO/IEC 14443‐Compatible RFID Interrogators

An analog front‐end circuit for ISO/IEC 14443‐compatible radio frequency identification (RFID) interrogators was designed and fabricated by using a 0.25 µm double‐poly CMOS process. The fabricated chip was operated using a 3.3 Volt single‐voltage supply. The results of this work could be provided as reusable IPs in the form of hard or firm IPs for designing single‐chip ISO/IEC 14443‐compatible RFID interrogators.     

Diode-pumped ytterbium-doped Sr5(PO4)3F laser performance

The performance of the first diode-pumped Yb³⁺-doped Sr ₅(PO₄)₃F (Yb:S-FAP) solid-state laser is discussed. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3×3×30 mm Yb:S-FAP rod. The saturation fluence for diode pumping was deduced to be 5.5 J/cm ² for the particular 2.8 kW peak power diode array utilized in our studies. This is 2.5× higher than the intrinsic 2.2 J/cm ² saturation fluence as is attributed to the 6.5 nm bandwidth of our diode pump array. The small signal gain is consistent with the previously measured emission cross section of 6.0×10^-20 cm², obtained from a narrowband-laser pumped gain experiment. Up to 1.7 J/cm³ of stored energy density was achieved in a 6×6×44 mm Yb:S-FAP amplifier rod. In a free running configuration, diode-pumped slope efficiencies up to 43% (laser output energy/absorbed pump energy) were observed with output energies up to ~0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 μs pulses     

塔河油田集输管线绝缘法兰附近内腐蚀穿孔因素分析

塔河油田主力油区为奥陶系碳酸盐岩溶缝洞型块状油藏,原油物性特征复杂,部分区块伴生气含有大量的H2S、CO2,地层产出水平均矿化度在20×104 mg/L左右,pH值5.5～6.0,呈弱酸性,呈现出较强的腐蚀性.油气集输系统自投产以来多次出现了腐蚀穿孔,以内腐蚀为主,且大部分集中在集输管线外加电流阴极保护绝缘法兰附近,较严重地影响了油田的正常生产.为系统地了解、分析腐蚀穿孔原因,开展了集输管线绝缘法兰附近内腐蚀穿孔因素分析与研究,明确了造成腐蚀穿孔的主要原因,提出了改进措施及建议.     

重质塔河原油的减粘裂化工艺

塔河原油是一种劣质、重质原油,该原油通过减粘裂化装置加工可得半成品的轻油,还可以得到合格的燃料油。     

Development of a Highly Selective,Sensitive, and Fast Response Upconversion Luminescent Platform for Hydrogen Sulfide Detection

Hydrogen sulfide (H₂S) has been recognized as one of most important gaseous signaling molecules mediated by a variety of physiological and pathological processes. Yet, its functions remain largely elusive due to the lack of potent monitoring methods. Hereby this issue is addressed with a powerful new platform—dye‐assembled upconversion nanoparticles (UCNPs). A series of chromophores with different absorption bands and fast responses towards H₂S is combined with UCNPs and results in a library of H₂S sensors with responsive emission signals ranging from the visible to the near‐infrared (NIR) region. These nanoprobes demonstrate highly selective and rapid responses to H₂S in vitro and in cells. Furthermore, H₂S levels in blood can be detected using the developed nanoprobes. Hence the reported H₂S sensing platform can serve as a powerful diagnostic tool to research H₂S functions and to investigate H₂S‐related diseases.