Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
6,420
result(s) for
"Xiang, Ji"
Sort by:
فرص شبكة الجيل الخامس (5G) : أي فرص تحملها لنا شبكة الجيل الخامس (5G) ؟ وكيف نغتنم هذه الفرص ؟
يثير الجيل الخامس (5G) متابعة العالم بأسره ويحظى أيضا باهتمام في الصين من القمة إلى القاعدة، وكل ذلك يبرهن على أمر معين وهو ما يتحلى به الناس من تطلع عميق تجاه الجيل الخامس (5G) بعد أن عشنا الجيل الرابع من الاتصالات (4G) ونحن على ثقة بأن الجيل الخامس (5G) يمثل فرصة كبرى لتغيير العالم ؛ فما الفرص التي سيجلب لنا الجيل الخامس (5G) يا ترى ؟ ومتى ستظهر هذه الفرص ؟ وكيف تغتنمها ؟ ؛ بعد فترة طويلة من المراقبة والتحليل والإحساس ومن خلال رسم خط مستقيم من الفرص ونظرة استشرافية شاركنا خبير الاتصالات شيانغ لي قانغ فرص الجيل الخامس (5G)، وهذا لم يسمح للمزيد من الناس بمعرفة ما الذي يعنيه الجيل الخامس (5G) فحسب، بل اطلعوا بشكل أوضح على ما يكن أن ينجز الجيل الخامس (5G) واستوعبوا أكثر من ذلك ما يمكن أن يفعله كل واحد منا من خلال الجيل الخامس (5G)
BOOK
Nano‐Enhanced Graphite/Phase Change Material/Graphene Composite for Sustainable and Efficient Passive Thermal Management
Passive battery thermal management systems (BTMSs) are critical for mitigation of battery thermal runaway (TR). Phase change materials (PCMs) have shown promise for mitigating transient thermal challenges. Fluid leakage and low effective thermal conductivity limit PCM adoption. Furthermore, the thermal capacitance of PCMs diminishes as their latent load is exhausted, creating an unsustainable cooling effect that is transitory. Here, an expanded graphite/PCM/graphene composite that solves these challenges is proposed. The expanded graphite/PCM phase change composite eliminates leakage and increases effective thermal conductivity while the graphene coating enables radiative cooling for PCM regeneration. The composite demonstrates excellent thermal performance in a real BTMS and shows a 26% decrease in temperature when compared to conventional BTMS materials. The composite exhibits thermal control performance comparable with active cooling, resulting in reduced cost and increased simplicity. In addition to BTMSs, this material is anticipated to have application in a plethora of engineered systems requiring stringent thermal management. A scalable, durable, lightweight, compact, leak‐free graphite/phase change material/graphene composite with high effective thermal conductivity is developed for battery thermal management applications. The composite efficiently absorbs battery heat and releases it to the environment using its intrinsically high thermal conductivity and high surface emissivity. This composite material enables passive cooling for potential application in aerospace, building, and mobile applications.
Journal Article
رومانسية الغرفة الغربية : رواية
رومانسية الغرفة الغربية هي واحدة من المسرحيات الدرامية التي حظيت بشعبية لا مثيل لها في الصين، منذ ظهورها في القرن الثالث عشر الميلادي، وقد تعرضت لنقد كثير إيجابي وسلبي على حد سواء، وكان لها تأثير كبير على العديد من المسرحيات والقصص القصيرة والروايات اللاحقة، كما لعبت دورا مهما في تطور النقد الدرامي. تتناول هذه المسرحية عدة مواضيع، منها : الثورة على الأعراف السائدة، ودعم حرية الشباب في اختيار الزوج المناسب بأنفسهم في ذلك الوقت، بعيدا عن قيود جميع العادات والتقاليد القديمة البالية، من خلال علاقة تجمع بين طالب علم مكافح وفتاة جميلة يحبان بعضهما من النظرة الأولى. يهدف هذا الكتاب-بلغته السلسة وكلماته البسيطة إلى مساعدة القراء في جميع أنحاء العالم على فهم هذه المسرحية.
A Comprehensive Survey of Vision-Based Human Action Recognition Methods
Although widely used in many applications, accurate and efficient human action recognition remains a challenging area of research in the field of computer vision. Most recent surveys have focused on narrow problems such as human action recognition methods using depth data, 3D-skeleton data, still image data, spatiotemporal interest point-based methods, and human walking motion recognition. However, there has been no systematic survey of human action recognition. To this end, we present a thorough review of human action recognition methods and provide a comprehensive overview of recent approaches in human action recognition research, including progress in hand-designed action features in RGB and depth data, current deep learning-based action feature representation methods, advances in human–object interaction recognition methods, and the current prominent research topic of action detection methods. Finally, we present several analysis recommendations for researchers. This survey paper provides an essential reference for those interested in further research on human action recognition.
Journal Article
Sonographic Reporting Completeness and Sonographic Features of Xanthogranulomatous endometritis: A Systematic Review and Quality Scoring Analysis of Case Reports
Background and Aims Xanthogranulomatous endometritis (XGE) is a rare, chronic inflammatory disease that could mimic endometrial malignancy. While ultrasound is a primary imaging tool in gynecology, a comprehensive synthesis of its features in XGE is lacking. This study aimed to: (1) systematically review and summarize the sonographic characteristics of XGE, and (2) introduce and apply a novel scoring system—demonstrated on XGE—for evaluating the completeness of sonographic reporting in case reports of rare diseases. Methods A systematic review was conducted following PRISMA guidelines, searching PubMed, Web of Science, and EMBASE for case reports describing ultrasound findings in pathologically confirmed XGE. A novel scoring system was developed and applied to evaluate completeness of sonographic reporting of XGE in case reports. Results Eighteen case reports were included. The mean quality score was 3.2 out of 8 (range: 1–6). The most frequently reported sonographic features were intrauterine fluid collection or mass (88.9%) and endometrial thickening or irregularity (61.1%). Uterine enlargement was reported in 38.9% of cases. Assessment of vascular features was notably limited, with only three reports (16.7%) documenting the use of Color Doppler; among these, two confirmed the presence of intralesional blood flow, and both of the reports that provided spectral Doppler parameters described a low resistive index (RI < 0.7). Conclusion This study summarizes the frequently reported sonographic features of XGE, which center on intrauterine abnormalities and endometrial changes. The application of our novel scoring table revealed that the sonographic reporting in existing case reports is often incomplete, with doppler assessment being a notable gap. Future reports would benefit from more detailed doppler and morphological descriptions, which could help build a more reliable evidence base for the preoperative diagnosis of this rare condition.
Journal Article
Causal Effects of Gut Microbiome on Systemic Lupus Erythematosus: A Two-Sample Mendelian Randomization Study
The observational association between gut microbiome and systemic lupus erythematosus (SLE) has been well documented. However, whether the association is causal remains unclear. The present study used publicly available genome-wide association study (GWAS) summary data to perform two-sample Mendelian randomization (MR), aiming to examine the causal links between gut microbiome and SLE. Two sets of MR analyses were conducted. A group of single nucleotide polymorphisms (SNPs) that less than the genome-wide statistical significance threshold (5 × 10 -8 ) served as instrumental variables. To obtain a comprehensive conclusion, the other group where SNPs were smaller than the locus-wide significance level (1 × 10 -5 ) were selected as instrumental variables. Based on the locus-wide significance level, the results indicated that there were causal effects of gut microbiome components on SLE risk. The inverse variance weighted (IVW) method suggested that Bacilli and Lactobacillales were positively correlated with the risk of SLE and Bacillales , Coprobacter and Lachnospira were negatively correlated with SLE risk. The results of weighted median method supported that Bacilli , Lactobacillales , and Eggerthella were risk factors for SLE and Bacillales and Coprobacter served as protective factors for SLE. The estimates of MR Egger suggested that genetically predicted Ruminiclostridium6 was negatively associated with SLE. Based on the genome-wide statistical significance threshold, the results showed that Actinobacteria might reduce the SLE risk. However, Mendelian randomization pleiotropy residual sum and outlier (MR-PRESSO) detected significant horizontal pleiotropy between the instrumental variables of Ruminiclostridium6 and outcome. This study support that there are beneficial or detrimental causal effects of gut microbiome components on SLE risk.
Journal Article
Achieving large thermal hysteresis in an anthracene-based manganese(II) complex via photo-induced electron transfer
Achieving magnetic bistability with large thermal hysteresis is still a formidable challenge in material science. Here we synthesize a series of isostructural chain complexes using 9,10-anthracene dicarboxylic acid as a photoactive component. The electron transfer photochromic Mn
2+
and Zn
2+
compounds with photogenerated diradicals are confirmed by structures, optical spectra, magnetic analyses, and density functional theory calculations. For the Mn
2+
analog, light irradiation changes the spin topology from a single Mn
2+
ion to a radical-Mn
2+
single chain, further inducing magnetic bistability with a remarkably wide thermal hysteresis of 177 K. Structural analysis of light irradiated crystals at 300 and 50 K reveals that the rotation of the anthracene rings changes the Mn1–O2–C8 angle and coordination geometries of the Mn
2+
center, resulting in magnetic bistability with this wide thermal hysteresis. This work provides a strategy for constructing molecular magnets with large thermal hysteresis via electron transfer photochromism.
Achieving magnetic bistability with large thermal hysteresis is still a challenge in material science. Here, the authors report a Mn(II) chain complex that enables light-induced magnetic bistability with a 177 K thermal hysteresis loop.
Journal Article
No Genetic Causal Association Between Periodontitis and Arthritis: A Bidirectional Two-Sample Mendelian Randomization Analysis
Periodontitis (PD) has been linked to arthritis in previous epidemiological observational studies; however, the results are inconclusive. It remains unclear whether the association between PD and arthritis is causal. The purpose of this study was to investigate the causal association of PD with arthritis, including rheumatoid arthritis (RA) and osteoarthritis (OA).
We performed a two-sample bidirectional Mendelian randomization (MR) analysis using publicly released genome-wide association studies (GWAS) statistics. The inverse-variance weighted (IVW) method was used as the primary analysis. We applied four complementary methods, including weighted median, weighted mode, MR-Egger regression and MR pleiotropy residual sum and outlier (MR-PRESSO) to detect and correct for the effect of horizontal pleiotropy.
Genetically determined PD did not have a causal effect on OA (OR = 1.06, 95% CI: 0.99-1.15,
= 0.09) and RA (OR = 0.99, 95% CI: 0.87-1.13,
= 0.89). Furthermore, we did not find a significant causal effect of arthritis on PD in the reverse MR analysis. The results of MR-Egger regression, Weighted Median, and Weighted Mode methods were consistent with those of the IVW method. Horizontal pleiotropy was unlikely to distort the causal estimates according to the sensitivity analysis.
Our MR analysis reveals non-causal association of PD with arthritis, despite observational studies reporting an association between PD and arthritis.
Journal Article
Mitigating hypersonic heat barrier via direct cooling enhanced by leidenfrost inhibition
Heat barrier, the unrestricted increase in airplane or rocket speeds caused by aerodynamic heating, which—without adequate provisions for cooling the exposed surfaces—can lead to the loss of a hypersonic vehicle’s reusability, maneuverability, and cost-effectiveness. To date, indirect thermal protection methods, such as regenerative cooling, film cooling, and transpiration cooling, have proven to be complex and inefficient. Here, we propose a direct liquid cooling system to mitigate the heat barrier, utilizing a blunt-sharp structured thermal armor (STA)—a recently proposed material [36] to elevate the Leidenfrost point. The fiber-metal nano-/micro-STA withstands rigorous simulated hypersonic aerodynamic heating using butane and acetylene flames, ensuring effective temperature management in scenarios where flame temperatures reach up to 3000 °C—far exceeding the melting point of the STA substrate. Systematic cycling and durability tests further confirm the STA’s exceptional tolerance and robustness under extreme conditions. This work offers an efficient thermal protection method for hypersonic vehicles.
Heat barriers pose significant challenges to hypersonic flight. Here, authors demonstrate a direct liquid cooling system using a structured thermal armor that elevates the Leidenfrost point, effectively managing temperatures up to 3000 °C.
Journal Article